Sample records for rotor diameter-the diameter

  1. Variable diameter wind turbine rotor blades

    DOE Patents [OSTI]

    Jamieson, Peter McKeich; Hornzee-Jones, Chris; Moroz, Emilian M.; Blakemore, Ralph W.

    2005-12-06T23:59:59.000Z

    A system and method for changing wind turbine rotor diameters to meet changing wind speeds and control system loads is disclosed. The rotor blades on the wind turbine are able to adjust length by extensions nested within or containing the base blade. The blades can have more than one extension in a variety of configurations. A cable winching system, a hydraulic system, a pneumatic system, inflatable or elastic extensions, and a spring-loaded jack knife deployment are some of the methods of adjustment. The extension is also protected from lightning by a grounding system.

  2. The 5-megawatt power plant with 126 metre rotor diameter

    E-Print Network [OSTI]

    Firestone, Jeremy

    The 5-megawatt power plant with 126 metre rotor diameter #12;Design data Rated power 5,000kW Cut-in speed 3.5m/s Rated wind speed 13.0m/s Cut-out speed 25.0m/s onshore 30.0m/s offshore Wind zone up to DIBt 3 Type class up to IEC Ib / GL offshore type class I Rotor Diameter 126.0m Rotor area 12,469m2

  3. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-Print Network [OSTI]

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

  4. Sparkr Blade Test Centre Wind turbines with a rotor diameter exceed-

    E-Print Network [OSTI]

    Sparkær Blade Test Centre Wind turbines with a rotor diameter exceed- ing 2 metres must have a type of a wind turbine. Failure of a rotor blade in service often involves damage of the entire turbine operating type cer- tification systems for wind turbines. Reg. no. 427 The Sparkær Blade Test Centre became

  5. Separators for flywheel rotors

    DOE Patents [OSTI]

    Bender, D.A.; Kuklo, T.C.

    1998-07-07T23:59:59.000Z

    A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors. 10 figs.

  6. Separators for flywheel rotors

    DOE Patents [OSTI]

    Bender, Donald A. (Dublin, CA); Kuklo, Thomas C. (Oakdale, CA)

    1998-01-01T23:59:59.000Z

    A separator forms a connection between the rotors of a concentric rotor assembly. This separator allows for the relatively free expansion of outer rotors away from inner rotors while providing a connection between the rotors that is strong enough to prevent disassembly. The rotor assembly includes at least two rotors referred to as inner and outer flywheel rings or rotors. This combination of inner flywheel ring, separator, and outer flywheel ring may be nested to include an arbitrary number of concentric rings. The separator may be a segmented or continuous ring that abuts the ends of the inner rotor and the inner bore of the outer rotor. It is supported against centrifugal loads by the outer rotor and is affixed to the outer rotor. The separator is allowed to slide with respect to the inner rotor. It is made of a material that has a modulus of elasticity that is lower than that of the rotors.

  7. Using a collision model to design safer wind turbine rotors for birds

    SciTech Connect (OSTI)

    Tucker, V.A. [Duke Univ., Durham, NC (United States). Dept. of Zoology

    1996-11-01T23:59:59.000Z

    A mathematical model for collisions between birds and propeller-type turbine rotors identifies the variables that can be manipulated to reduce the probability that birds will collide with the rotor. This study defines a safety index--the clearance power density--that allows rotors of different sizes and designs to be compared in terms of the amount of wind energy converted to electrical energy per bird collision. The collision model accounts for variations in wind speed during the year and shows that for model rotors with simple, one-dimensional blades, the safety index increases in proportion to rotor diameter, and variable speed rotors have higher safety indexes than constant speed rotors. The safety index can also be increased by enlarging the region near the center of the rotor hub where the blades move slowly enough for birds to avoid them. Painting the blades to make them more visible might have this effect. Model rotors with practical designs can have safety indexes an order of magnitude higher than those for model rotors typical of the constant speeds rotors in common use today. This finding suggests that redesigned rotors could have collision rates with birds perhaps an order of magnitude lower than today`s rotors, with no reduction in the production of wind power. The empirical data that exist for collisions between raptors, such as hawks and eagles, and rotors are consistent with the model: the numbers of raptor carcasses found beneath large variable speed rotors, relative to the numbers found under small constant speed rotors, are in the proportions predicted by the collision model rather than in proportion to the areas swept by the rotor blades. However, uncontrolled variables associated with these data prevent a stronger claim of support for the model.

  8. Single Rotor Turbine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2004-10-26T23:59:59.000Z

    A rotor for use in turbine applications has a centrifugal compressor having axially disposed spaced apart fins forming passages and an axial turbine having hollow turbine blades interleaved with the fins and through which fluid from the centrifugal compressor flows.

  9. Polygonal shaft hole rotor

    DOE Patents [OSTI]

    Hussey, John H. (St. Louis, MO); Rose, John Scott (Alton, IL); Meystrik, Jeffrey J. (Webster Groves, MO); White, Kent Lee (Maryland Heights, MO)

    2001-01-23T23:59:59.000Z

    A laminated rotor for an induction motor has a plurality of ferro-magnetic laminations mounted axially on a rotor shaft. Each of the plurality of laminations has a central aperture in the shape of a polygon with sides of equal length. The laminations are alternatingly rotated 180.degree. from one another so that the straight sides of the polygon shaped apertures are misaligned. As a circular rotor shaft is press fit into a stack of laminations, the point of maximum interference occurs at the midpoints of the sides of the polygon (i.e., at the smallest radius of the central apertures of the laminations). Because the laminates are alternatingly rotated, the laminate material at the points of maximum interference yields relatively easily into the vertices (i.e., the greatest radius of the central aperture) of the polygonal central aperture of the next lamination as the shaft is inserted into the stack of laminations. Because of this yielding process, the amount of force required to insert the shaft is reduced, and a tighter fit is achieved.

  10. Single rotor turbine engine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2002-01-01T23:59:59.000Z

    There has been invented a turbine engine with a single rotor which cools the engine, functions as a radial compressor, pushes air through the engine to the ignition point, and acts as an axial turbine for powering the compressor. The invention engine is designed to use a simple scheme of conventional passage shapes to provide both a radial and axial flow pattern through the single rotor, thereby allowing the radial intake air flow to cool the turbine blades and turbine exhaust gases in an axial flow to be used for energy transfer. In an alternative embodiment, an electric generator is incorporated in the engine to specifically adapt the invention for power generation. Magnets are embedded in the exhaust face of the single rotor proximate to a ring of stationary magnetic cores with windings to provide for the generation of electricity. In this alternative embodiment, the turbine is a radial inflow turbine rather than an axial turbine as used in the first embodiment. Radial inflow passages of conventional design are interleaved with radial compressor passages to allow the intake air to cool the turbine blades.

  11. Homopolar motor with dual rotors

    DOE Patents [OSTI]

    Hsu, J.S.

    1998-12-01T23:59:59.000Z

    A homopolar motor has a field rotor mounted on a frame for rotation in a first rotational direction and for producing an electromagnetic field, and an armature rotor mounted for rotation on said frame within said electromagnetic field and in a second rotational direction counter to said first rotational direction of said field rotor. The two rotors are coupled through a 1:1 gearing mechanism, so as to travel at the same speed but in opposite directions. This doubles the output voltage and output power, as compared to a motor in which only the armature is rotated. Several embodiments are disclosed. 7 figs.

  12. Sandia National Laboratories: National Rotor Testbed Functional...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of the National Rotor Testbed: An Aeroelastically Relevant Research-Scale Wind Turbine Rotor." Approximately 60 researchers from various institutions and countries attended...

  13. Wind turbine rotor aileron

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT)

    1994-06-14T23:59:59.000Z

    A wind turbine has a rotor with at least one blade which has an aileron which is adjusted by an actuator. A hinge has two portions, one for mounting a stationary hinge arm to the blade, the other for coupling to the aileron actuator. Several types of hinges can be used, along with different actuators. The aileron is designed so that it has a constant chord with a number of identical sub-assemblies. The leading edge of the aileron has at least one curved portion so that the aileron does not vent over a certain range of angles, but vents if the position is outside the range. A cyclic actuator can be mounted to the aileron to adjust the position periodically. Generally, the aileron will be adjusted over a range related to the rotational position of the blade. A method for operating the cyclic assembly is also described.

  14. Hi-Q Rotor - Low Wind Speed Technology

    SciTech Connect (OSTI)

    Todd E. Mills; Judy Tatum

    2010-01-11T23:59:59.000Z

    The project objective was to optimize the performance of the Hi-Q Rotor. Early research funded by the California Energy Commission indicated the design might be advantageous over state-of-the-art turbines for collecting wind energy in low wind conditions. The Hi-Q Rotor is a new kind of rotor targeted for harvesting wind in Class 2, 3, and 4 sites, and has application in areas that are closer to cities, or 'load centers.' An advantage of the Hi-Q Rotor is that the rotor has non-conventional blade tips, producing less turbulence, and is quieter than standard wind turbine blades which is critical to the low-wind populated urban sites. Unlike state-of-the-art propeller type blades, the Hi-Q Rotor has six blades connected by end caps. In this phase of the research funded by DOE's Inventions and Innovation Program, the goal was to improve the current design by building a series of theoretical and numeric models, and composite prototypes to determine a best of class device. Development of the rotor was performed by aeronautical engineering and design firm, DARcorporation. From this investigation, an optimized design was determined and an 8-foot diameter, full-scale rotor was built and mounted using a Bergey LX-1 generator and furling system which were adapted to support the rotor. The Hi-Q Rotor was then tested side-by-side against the state-of-the-art Bergey XL-1 at the Alternative Energy Institute's Wind Test Center at West Texas State University for six weeks, and real time measurements of power generated were collected and compared. Early wind tunnel testing showed that the cut-in-speed of the Hi-Q rotor is much lower than a conventional tested HAWT enabling the Hi-Q Wind Turbine to begin collecting energy before a conventional HAWT has started spinning. Also, torque at low wind speeds for the Hi-Q Wind Turbine is higher than the tested conventional HAWT and enabled the wind turbine to generate power at lower wind speeds. Based on the data collected, the results of our first full-scale prototype wind turbine proved that higher energy can be captured at lower wind speeds with the new Hi-Q Rotor. The Hi-Q Rotor is almost 15% more productive than the Bergey from 6 m/s to 8 m/s, making it ideal in Class 3, 4, and 5 wind sites and has application in the critical and heretofore untapped areas that are closer to cities, 'load centers,' and may even be used directly in urban areas. The additional advantage of the Hi-Q Rotor's non-conventional blade tips, which eliminates most air turbulence, is noise reduction which makes it doubly ideal for populated urban areas. Hi-Q Products recommends one final stage of development to take the Hi-Q Rotor through Technology Readiness Levels 8-9. During this stage of development, the rotor will be redesigned to further increase efficiency, match the rotor to a more suitable generator, and lower the cost of manufacturing by redesigning the structure to allow for production in larger quantities at lower cost. Before taking the rotor to market and commercialization, it is necessary to further optimize the performance by finding a better generator and autofurling system, ones more suitable for lower wind speeds and rpms should be used in all future testing. The potential impact of this fully developed technology will be the expansion and proliferation of energy renewal into the heretofore untapped Class 2, 3, 4, and 5 Wind Sites, or the large underutilized sites where the wind speed is broken by physical features such as mountains, buildings, and trees. Market estimates by 2011, if low wind speed technology can be developed are well above: 13 million homes, 675,000 commercial buildings, 250,000 public facilities. Estimated commercial exploitation of the Hi-Q Rotor show potential increase in U.S. energy gained through the clean, renewable wind energy found in low and very low wind speed sites. This new energy source would greatly impact greenhouse emissions as well as the public sector's growing energy demands.

  15. Probabilistic analysis of meanline compressor rotor performance

    E-Print Network [OSTI]

    Fitzgerald, Nathan Andrew, 1980-

    2004-01-01T23:59:59.000Z

    This thesis addresses variability in aerodynamic performance of a compressor rotor due to geometric variation. The performance of the rotor is computed using a meanline model that includes the effect of tip clearance ...

  16. Axial seal system for a gas turbine steam-cooled rotor

    DOE Patents [OSTI]

    Mashey, Thomas Charles (Anderson, SC)

    2002-01-01T23:59:59.000Z

    An axial seal assembly is provided at the interface between adjacent wheels and spacers of a gas turbine rotor and disposed about tubes passing through openings in the rotor adjacent the rotor rim and carrying a thermal medium. Each seal assembly includes a support bushing for supporting a land of the thermal medium carrying tube, an axially registering seat bushing disposed in the opposed opening and a frustoconical seal between the seal bushing and seat. The seal bushing includes a radial flange having an annular recess for retaining the outer diameter edge of the seal, while the seat bushing has an axially facing annular surface forming a seat for engagement by the inner diameter edge of the seal.

  17. Turbomachine rotor with improved cooling

    DOE Patents [OSTI]

    Hultgren, Kent Goran (Winter Park, FL); McLaurin, Leroy Dixon (Winter Springs, FL); Bertsch, Oran Leroy (Titusville, FL); Lowe, Perry Eugene (Oviedo, FL)

    1998-01-01T23:59:59.000Z

    A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn.

  18. Turbomachine rotor with improved cooling

    DOE Patents [OSTI]

    Hultgren, K.G.; McLaurin, L.D.; Bertsch, O.L.; Lowe, P.E.

    1998-05-26T23:59:59.000Z

    A gas turbine rotor has an essentially closed loop cooling air scheme in which cooling air drawn from the compressor discharge air that is supplied to the combustion chamber is further compressed, cooled, and then directed to the aft end of the turbine rotor. Downstream seal rings attached to the downstream face of each rotor disc direct the cooling air over the downstream disc face, thereby cooling it, and then to cooling air passages formed in the rotating blades. Upstream seal rings attached to the upstream face of each disc direct the heated cooling air away from the blade root while keeping the disc thermally isolated from the heated cooling air. From each upstream seal ring, the heated cooling air flows through passages in the upstream discs and is then combined and returned to the combustion chamber from which it was drawn. 5 figs.

  19. Rotor Blades and Ground Effect Richard Purvis

    E-Print Network [OSTI]

    Purvis, Richard

    Rotor Blades and Ground Effect Richard Purvis Department of Mathematics University College London to examine various aspects of rotor blade flows and ground effect. It explores two- and three- dimensional flows, generally concentrating upon regimes that have a degree of rel- evance to typical rotor blade

  20. Characterization of an aerodynamic lens for transmitting particles greater than 1 micrometer in diameter into the Aerodyne aerosol mass spectrometer

    E-Print Network [OSTI]

    Williams, L. R.

    We have designed and characterized a new inlet and aerodynamic lens for the Aerodyne aerosol mass spectrometer (AMS) that transmits particles between 80 nm and more than 3 ?m in vacuum aerodynamic diameter. The design of ...

  1. Rotor blades for turbine engines

    DOE Patents [OSTI]

    Piersall, Matthew R; Potter, Brian D

    2013-02-12T23:59:59.000Z

    A tip shroud that includes a plurality of damping fins, each damping fin including a substantially non-radially-aligned surface that is configured to make contact with a tip shroud of a neighboring rotor blade. At least one damping fin may include a leading edge damping fin and at least one damping fin may include a trailing edge damping fin. The leading edge damping fin may be configured to correspond to the trailing edge damping fin.

  2. Method for manufacturing a rotor having superconducting coils

    DOE Patents [OSTI]

    Driscoll, David I. (South Euclid, OH); Shoykhet, Boris A. (Beachwood, OH)

    2001-01-01T23:59:59.000Z

    A method and apparatus for manufacturing a rotor for use with a rotating machine is provided that employs a superconducting coil on the rotor. An adhesive is applied to an outer surface of the rotor body, which may include a groove disposed within an outer surface of the rotor body. A superconducting coil is then mounted onto the rotor body such that the adhesive bonds the superconducting coil to the rotor body.

  3. SMART Wind Turbine Rotor: Design and Field Test | Department...

    Broader source: Energy.gov (indexed) [DOE]

    Design and Field Test SMART Wind Turbine Rotor: Design and Field Test This report documents the design, fabrication, and testing of the SMART Wind Turbine Rotor. This work...

  4. Multiple piece turbine rotor blade

    DOE Patents [OSTI]

    Jones, Russell B; Fedock, John A

    2013-05-21T23:59:59.000Z

    A multiple piece turbine rotor blade with a shell having an airfoil shape and secured between a spar and a platform with the spar including a tip end piece. a snap ring fits around the spar and abuts against the spar tip end piece on a top side and abuts against a shell on the bottom side so that the centrifugal loads from the shell is passed through the snap ring and into the spar and not through a tip cap dovetail slot and projection structure.

  5. Optimum balancing for flexible rotor

    E-Print Network [OSTI]

    Fu, Her James

    1975-01-01T23:59:59.000Z

    for the donation of vibration pick-ups and the loan of precious equipment. A special appreciation is extended to my friend, Miss Mei Ou-Yang, for her assistance, encouragement and unselfish support during the preparation and completion of this project. Last... Balancing Fig. 9 Typical Phase Lag Between Force and Vibration Amplitude Chart 14 20 Fig. 10 Typical Principal Modes for a Symmetric and Uniform Shaft 21 Fig. ll Test Rig Setup Fig. 12 Typical Rotor, Probe and Probe Stand Fig. 13 Critical Speed VS...

  6. Radial-radial single rotor turbine

    DOE Patents [OSTI]

    Platts, David A. (Los Alamos, NM)

    2006-05-16T23:59:59.000Z

    A rotor for use in turbine applications has a radial compressor/pump having radially disposed spaced apart fins forming passages and a radial turbine having hollow turbine blades interleaved with the fins and through which fluid from the radial compressor/pump flows. The rotor can, in some applications, be used to produce electrical power.

  7. Acoustic modulation effect of rotating stator/rotor interaction noise

    E-Print Network [OSTI]

    Boyer, Edmond

    order, B(k) is the number of rotor blades, (k) is the angular velocity of the rotor, (l) is the angular on the rotor blades and on the fixed parts. According to the Ffowcs-Williams and Hawk- ings analogy comes from the periodic forces on the rotor blades and the forces on the other static parts of the fan

  8. Safety Warnings Quad Rotors (Quad-Pilot 2 F.3)

    E-Print Network [OSTI]

    Langendoen, Koen

    Safety Warnings Quad Rotors (Quad-Pilot 2 F.3) The quad rotor "quad-pilot 2 F.3" is a complicated accidents from taking place. Operation of the quad rotor should be performed in a safe and responsible not accept any liability for damage and consequent damage arising from the use of the quad rotors, as we have

  9. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, Scott E. (Brentwood, CA); Deteresa, Steven J. (Livermore, CA)

    1998-01-01T23:59:59.000Z

    An interlayer toughening mechanism to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0.degree. to 90.degree. to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles.

  10. Interlayer toughening of fiber composite flywheel rotors

    DOE Patents [OSTI]

    Groves, S.E.; Deteresa, S.J.

    1998-07-14T23:59:59.000Z

    An interlayer toughening mechanism is described to mitigate the growth of damage in fiber composite flywheel rotors for long application. The interlayer toughening mechanism may comprise one or more tough layers composed of high-elongation fibers, high-strength fibers arranged in a woven pattern at a range from 0{degree} to 90{degree} to the rotor axis and bound by a ductile matrix material which adheres to and is compatible with the materials used for the bulk of the rotor. The number and spacing of the tough interlayers is a function of the design requirements and expected lifetime of the rotor. The mechanism has particular application in uninterruptable power supplies, electrical power grid reservoirs, and compulsators for electric guns, as well as electromechanical batteries for vehicles. 2 figs.

  11. Wind turbine rotor hub and teeter joint

    DOE Patents [OSTI]

    Coleman, Clint (Warren, VT); Kurth, William T. (Warren, VT); Jankowski, Joseph (Stowe, VT)

    1994-10-11T23:59:59.000Z

    A rotor hub is provided for coupling a wind turbine rotor blade and a shaft. The hub has a yoke with a body which is connected to the shaft, and extension portions which are connected to teeter bearing blocks, each of which has an aperture. The blocks are connected to a saddle which envelops the rotor blade by one or two shafts which pass through the apertures in the bearing blocks. The saddle and blade are separated by a rubber interface which provides for distribution of stress over a larger portion of the blade. Two teeter control mechanisms, which may include hydraulic pistons and springs, are connected to the rotor blade and to the yoke at extension portions. These control mechanisms provide end-of-stroke damping, braking, and stiffness based on the teeter angle and speed of the blade.

  12. A carbon nanotube bearing and Stodola rotor

    E-Print Network [OSTI]

    Cook, Eugene Hightower

    2008-01-01T23:59:59.000Z

    A nano-scale rotor supported on a cantilevered multi-wall carbon nanotube (MWNT) shaft (Stodola configuration) is proposed. The nanotube is also expected to function as the bearing, since individual walls of a MWNT are not ...

  13. Final project report: High energy rotor development, test and evaluation

    SciTech Connect (OSTI)

    NONE

    1996-09-01T23:59:59.000Z

    Under the auspices of the {open_quotes}Government/Industry Wind Technology Applications Project{close_quotes} [{open_quotes}Letter of Interest{close_quotes} (LOI) Number RC-1-11101], Flo Wind Corp. has successfully developed, tested, and delivered a high-energy rotor upgrade candidate for their 19-meter Vertical Axis Wind Turbine. The project included the demonstration of the innovative extended height-to-diameter ratio concept, the development of a continuous span single-piece composite blade, the demonstration of a continuous blade manufacturing technique, the utilization of the Sandia National Laboratories developed SNLA 2150 natural laminar flow airfoil and the reuse of existing wind turbine and wind power plant infrastructure.

  14. A reduced Blade-Vortex Interaction rotor

    E-Print Network [OSTI]

    Mani, Somnath

    2012-06-07T23:59:59.000Z

    A REDUCED BLADE - VORTEX INTERACTION ROTOR A Thesis by SOMNATH MANI . Submitted to the Offic of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 1996 Major... Subject: Aerospace Engineering A REDUCED BLADE - VORTEX INTERACTION ROTOR A Thesis by SOMNATH MANI Submitted to Texas A@M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content...

  15. Turbine bearings and rotor dynamics workshop: proceedings

    SciTech Connect (OSTI)

    Brown, R.G.; Quilliam, J.F. (eds.)

    1985-06-01T23:59:59.000Z

    An EPRI workshop to address turbine bearing reliability improvement and rotor dynamics was co-hosted by Detroit Edison in Dearborn, Michigan on September 8-10, 1982. The 136 attendees represented a broad spectrum of US utilities, equipment manufacturers, and consultants, as well as representatives from England, Japan, and Switzerland. These proceedings contain the text of the formal presentations as well as summaries of the working group sessions which were devoted to topics of particular interest to the workshop participants. Formal presentations were organized under the following general session titles: utility experience and advancements in turbine bearing and lubrication systems; recent advancements in turbine bearing and lubrication systems; utility experience and advancements in turbine-generator rotor dynamics; and recent advancements in turbine-generator rotor dynamics. In addition to the technical presentations, working group sessions were held on selected topics relevant to turbine bearing reliability improvement and rotor dynamics. These groups provided a forum for engineers to exchange ideas and information in a less formal environment. The discussions provided attendees with an opportunity to discuss key issues in more detail and address subjects not covered in the formal presentations. The subjects of these working groups were: rotor dynamic analysis and problem solving; vibration signature analysis and field balancing; oil contamination monitoring and control; and operation and maintenance practices. Individual papers have been entered individually into EDB and ERA.

  16. active elevon rotor: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  17. active twist rotor: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  18. advanced turbocharger rotor: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  19. active flap rotor: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  20. advanced rotor systems: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  1. adiabatic rotor model: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  2. asymmetric rotor model: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (UGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords:...

  3. The cost of noise reduction in commercial tilt rotor aircraft

    E-Print Network [OSTI]

    Faulkner, Henry B.

    1974-01-01T23:59:59.000Z

    The relationship between direct operating cost and departure noise annoyance was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt rotor aircraft designs to meet various ...

  4. Accelerator dynamics of a fractional kicked rotor

    E-Print Network [OSTI]

    A. Iomin

    2006-09-14T23:59:59.000Z

    It is shown that the Weyl fractional derivative can quantize an open system. A fractional kicked rotor is studied in the framework of the fractional Schrodinger equation. The system is described by the non-Hermitian Hamiltonian by virtue of the Weyl fractional derivative. Violation of space symmetry leads to acceleration of the orbital momentum. Quantum localization saturates this acceleration, such that the average value of the orbital momentum can be a direct current and the system behaves like a ratchet. The classical counterpart is a nonlinear kicked rotor with absorbing boundary conditions.

  5. Ultra-Micro Wave Rotor Investigations Florin Iancu, Janusz Piechna*

    E-Print Network [OSTI]

    Müller, Norbert

    Nowowiejska Str., 00-665 Warsaw, Poland Abstract Ultra Micro Gas Turbines (UµGT) are expected to be a next of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors, topping gas turbines at about 70%. Keywords: PowerMEMS, wave rotor, ultra micro gas turbine, pressure exchanger, efficiency 1

  6. Texas Fluid Dynamics Meeting, 2013 STABILITY OF ROTOR WAKES.

    E-Print Network [OSTI]

    Tinney, Charles E.

    et al.(2000) [1] did eigenvalue stability analysis on multi-bladed helicopter rotor wakes and found, of multi-bladed helicopter rotor wake. Despite various analytical, numerical and flow visualiza- tion-scale four- bladed helicopter rotor in hover [6,7], revealed some impor- tant observations. Investigations

  7. Modeling of a rotor speed transient response with radial rubbing

    E-Print Network [OSTI]

    Boyer, Edmond

    by an accidental blade­off imbalance. In order to assess the angular deceleration of the rotor due to rubbingModeling of a rotor speed transient response with radial rubbing Sébastien Roques1 Institut deGill Univer- sity, 817 Sherbrooke St West, Montreal, Quebec H3A 2K6, Canada Abstract A rotor­stator model

  8. On the Classification of Universal Rotor-Routers

    E-Print Network [OSTI]

    He, Xiaoyu

    2011-01-01T23:59:59.000Z

    The combinatorial theory of rotor-routers has connections with problems of statistical mechanics, graph theory, chaos theory, and computer science. A rotor-router network defines a deterministic walk on a digraph G in which a particle walks from a source vertex until it reaches one of several target vertices. Motivated by recent results due to Giacaglia et al., we study rotor-router networks in which all non-target vertices have the same type. A rotor type r is universal if every hitting sequence can be achieved by a homogeneous rotor-router network consisting entirely of rotors of type r. We give a conjecture that completely classifies universal rotor types. Then, this problem is simplified by a theorem we call the Reduction Theorem that allows us to consider only two-state rotors. A rotor-router network called the compressor, because it tends to shorten rotor periods, is introduced along with an associated algorithm that determines the universality of almost all rotors. New rotor classes, including boppy ro...

  9. Dynamics and Fatigue Damage of Wind Turbine Rotors

    E-Print Network [OSTI]

    6 3 RiS0-Rr512 Dynamics and Fatigue Damage of Wind Turbine Rotors during Steady Operation Peter OF WIND TURBINE ROTORS DURING STEADY OPERATION Peter Hauge Madsen, Sten Frandsen, William E. Holley-carrying capacity of a wind turbine rotor with respect to short-term strength and material fatigue are presented

  10. INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight

    E-Print Network [OSTI]

    1 CHAPTER I INTRODUCTION 1.1 Aerodynamics of Rotors in Forward Flight The prediction of rotor blade aerodynamic loads, especially in forward flight, requires accurate and efficient modeling of several distinct to the nonlinear interaction between the rotor aerodynamics, trim, aeroelasticity and blade dynamics. As stated

  11. Rotor bore and turbine rotor wheel/spacer heat exchange flow circuit

    DOE Patents [OSTI]

    Caruso, Philip M. (Selkirk, NY); Eldrid, Sacheverel Quentin (Saratoga Springs, NY); Ladhani, Azad A. (Niskayuna, NY); DeMania, Alan Richard (Niskayuna, NY); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY); Rathbun, Lisa Shirley (Scotia, NY); Akin, Robert Craig (Schenectady, NY)

    2002-01-01T23:59:59.000Z

    In a turbine having closed-circuit steam-cooling passages about the rim of the rotor during steady-state operation, compressor discharge air is supplied to the rotor bore for passage radially outwardly into the wheel space cavities between the wheels and spacers. Communicating slots and channels in the spacers and wheels at circumferentially spaced positions enable egress of the compressor discharge air into the hot gas flow path. At turbine startup, cooling air flows through the closed-circuit steam passages to cool the outer rim of the rotor while compressor discharge air pre-warms the wheels and spacers. At steady-state, cooling steam is supplied in the closed-circuit steam-cooling passages and compressor discharge air is supplied through the bore and into the wheel space cavities to cool the rotor.

  12. Voith High Efficiency HM Rotor Energy Data, A Repulper Rotor Design Case Study

    E-Print Network [OSTI]

    Aue, J.; Fineran, B.

    2005-01-01T23:59:59.000Z

    A recently completed demonstration project, funded partly by the Wisconsin Focus on Energy program and Wisconsin Public Service Corporation, shows the effectiveness of an energy efficient repulper rotor design compared with that of a conventional...

  13. Utilization of rotor kinetic energy storage for hybrid vehicles

    DOE Patents [OSTI]

    Hsu, John S. (Oak Ridge, TN)

    2011-05-03T23:59:59.000Z

    A power system for a motor vehicle having an internal combustion engine, the power system comprises an electric machine (12) further comprising a first excitation source (47), a permanent magnet rotor (28) and a magnetic coupling rotor (26) spaced from the permanent magnet rotor and at least one second excitation source (43), the magnetic coupling rotor (26) also including a flywheel having an inertial mass to store kinetic energy during an initial acceleration to an operating speed; and wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor (26) exerts torque on the permanent magnet rotor (28) to assist braking and acceleration of the permanent magnet rotor (28) and consequently, the vehicle. An axial gap machine and a radial gap machine are disclosed and methods of the invention are also disclosed.

  14. The Effects of 100 nmThe Effects of 100 nm--DiameterDiameterThe Effects of 100 nmThe Effects of 100 nm--DiameterDiameter Au Nanoparticles onAu Nanoparticles onAu Nanoparticles onAu Nanoparticles onpp

    E-Print Network [OSTI]

    Park, Byungwoo

    DyeDye--Sensitized Solar CellsSensitized Solar Cells pp DyeDye--Sensitized Solar CellsSensitized Solar of photovoltaic properties. #12;Introduction: Dye-Sensitized Solar Cells (DSSCs) e-e- Au-SiO2 Core Solar Cell> I: Light Intensity E: Amplitude of E-Field [H

  15. Electrofriction method of manufacturing squirrel cage rotors

    DOE Patents [OSTI]

    Hsu, John S.

    2005-04-12T23:59:59.000Z

    A method of making a squirrel cage rotor of copper material for use in AC or DC motors, includes forming a core with longitudinal slots, inserting bars of conductive material in the slots, with ends extending out of opposite ends of the core, and joining the end rings to the bars, wherein the conductive material of either the end rings or the bars is copper. Various methods of joining the end rings to the bars are disclosed including electrofriction welding, current pulse welding and brazing, transient liquid phase joining and casting. Pressure is also applied to the end rings to improve contact and reduce areas of small or uneven contact between the bar ends and the end rings. Rotors made with such methods are also disclosed.

  16. Dynamical Localization in Kicked Quantum Rotors

    E-Print Network [OSTI]

    Kamalov, Andrei; Bucksbaum, Philip H

    2015-01-01T23:59:59.000Z

    The periodically $\\delta$-kicked quantum linear rotor is known to experience non-classical bounded energy growth due to quantum dynamical localization in angular momentum space. We study the effect of random deviations of the kick period in simulations and experiments. This breaks the energy and angular momentum localization and increases the rotational alignment, which is the analog of the onset of Anderson localization in 1-D chains.

  17. Double-ended ceramic helical-rotor expander

    DOE Patents [OSTI]

    Mohr, P.B.; Myers, W.B.

    1995-02-28T23:59:59.000Z

    A ceramic helical rotor expander is disclosed using a double-ended or tandem herringbone type rotor arrangement with bearing and seal assemblies remote from the hot gas inlets and especially capable of operating at an inlet temperature of above 1,100 C. The rotors are solid or hollow and bonded to hollow metal shafts, and mounted in a composite or simple prismatic casing. The rotors, casing and shafts are constructed from low expansivity materials. In the preferred embodiment the rotors are constructed of silicon nitride and the shafts constructed of an molybdenum alloy, with the metal shafts being supported in bearings and secured to synchronizing gears. The rotors and casing may be provided with coolant channels therein, and are constructed to eliminate the problem of end leakages at inlet temperature and pressure, and the need for high temperature bearings and seals. 3 figs.

  18. Disc rotors with permanent magnets for brushless dc motor

    SciTech Connect (OSTI)

    Hawsey, R.A.; Bailery, J.M.

    1992-05-26T23:59:59.000Z

    This patent describes a brushless dc permanent magnet motor for driving an autonomous underwater vehicle. It comprises first and second substantially flat, generally cylindrical stators disposed in side by side relation; a first substantially flat, generally cylindrical rotor; a first shaft connected to the first rotor and a second, concentric shaft connected to the second rotor; and means for providing rotation of the first and second shafts in opposite directions.

  19. Rotor for processing liquids using movable capillary tubes

    DOE Patents [OSTI]

    Johnson, W.F.; Burtis, C.A.; Walker, W.A.

    1987-07-17T23:59:59.000Z

    A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described. 5 figs.

  20. Precision wire feeder for small diameter wire

    DOE Patents [OSTI]

    Brandon, Eldon D. (Albuquerque, NM); Hooper, Frederick M. (Albuquerque, NM); Reichenbach, Marvin L. (Albuquerque, NM)

    1992-01-01T23:59:59.000Z

    A device for feeding small diameter wire having a diameter less than 0.04 mm (16 mil) to a welding station includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut.

  1. Precision wire feeder for small diameter wire

    DOE Patents [OSTI]

    Brandon, E.D.; Hooper, F.M.; Reichenbach, M.L.

    1992-08-11T23:59:59.000Z

    A device for feeding small diameter wire having a diameter less than 0.04 mm (16 mil) to a welding station includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut. 1 figure.

  2. Interface structure for hub and mass attachment in flywheel rotors

    DOE Patents [OSTI]

    Deteresa, Steven J. (Livermore, CA); Groves, Scott E. (Brentwood, CA)

    1998-06-02T23:59:59.000Z

    An interface structure for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is comprised of high-strength fiber, such as glass and carbon, woven into an angle pattern which is about 45.degree. with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material which is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning.

  3. Interface structure for hub and mass attachment in flywheel rotors

    DOE Patents [OSTI]

    Deteresa, S.J.; Groves, S.E.

    1998-06-02T23:59:59.000Z

    An interface structure is described for hub and mass attachment in flywheel rotors. The interface structure efficiently transmits high radial compression forces and withstands both large circumferential elongation and local stresses generated by mass-loading and hub attachments. The interface structure is comprised of high-strength fiber, such as glass and carbon, woven into an angle pattern which is about 45{degree} with respect to the rotor axis. The woven fiber is bonded by a ductile matrix material which is compatible with and adheres to the rotor material. This woven fiber is able to elongate in the circumferential direction to match the rotor growth during spinning. 2 figs.

  4. Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial...

    Broader source: Energy.gov (indexed) [DOE]

    Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial Mentorship Program...

  5. E-Print Network 3.0 - aero-elasticity rotor aerodynamics Sample...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Summary: HVDC 12;Rotor aero-elastics and structural dynamics 12;Aerodynamics for wind turbines Flow over... and components Rotor aero-elastics and structural dynamics Grid...

  6. Chaos in a rotor system supported by ball bearings

    E-Print Network [OSTI]

    Fisher, James Robert, 1979-

    2013-02-22T23:59:59.000Z

    to observing chaos in rotor systems. Further, there has been little work carried out in the area of chaos control, of which only a small portion has been applied to rotor systems. Originally, the goal of the research described in this paper was to control...

  7. Main Rotor Swashplate Test Stand Design Model and System Overview

    E-Print Network [OSTI]

    Almor, Amit

    on the aircraft due to reaction forces generated by rotor blade lift which varies with rotor speed and blade angle of the modified stand: Rotating Components Drivetrain o Variable speed AC Motor o Double cardan input driveshaft, and more closely mimic the operational kinematics of a swashplate which is installed on an aircraft

  8. Effects of increasing tip velocity on wind turbine rotor design.

    SciTech Connect (OSTI)

    Resor, Brian Ray; Maniaci, David Charles; Berg, Jonathan Charles; Richards, Phillip William

    2014-05-01T23:59:59.000Z

    A reduction in cost of energy from wind is anticipated when maximum allowable tip velocity is allowed to increase. Rotor torque decreases as tip velocity increases and rotor size and power rating are held constant. Reduction in rotor torque yields a lighter weight gearbox, a decrease in the turbine cost, and an increase in the capacity for the turbine to deliver cost competitive electricity. The high speed rotor incurs costs attributable to rotor aero-acoustics and system loads. The increased loads of high speed rotors drive the sizing and cost of other components in the system. Rotor, drivetrain, and tower designs at 80 m/s maximum tip velocity and 100 m/s maximum tip velocity are created to quantify these effects. Component costs, annualized energy production, and cost of energy are computed for each design to quantify the change in overall cost of energy resulting from the increase in turbine tip velocity. High fidelity physics based models rather than cost and scaling models are used to perform the work. Results provide a quantitative assessment of anticipated costs and benefits for high speed rotors. Finally, important lessons regarding full system optimization of wind turbines are documented.

  9. Precision wire feeder for small diameter wire

    SciTech Connect (OSTI)

    Brandon, E.D.; Hooper, F.M.; Reichenbach, M.L.

    1990-12-31T23:59:59.000Z

    This invention is comprised of a device for feeding small diameter wire having a diameter less than .04 mm (16 mil) to a welding station which includes a driving wheel for controllably applying a non-deforming driving force to the wire to move the free end of the wire towards the welding station; and a tension device such as a torque motor for constantly applying a reverse force to the wire in opposition to the driving force to keep the wire taut. 1 fig.

  10. Disc rotors with permanent magnets for brushless DC motor

    SciTech Connect (OSTI)

    Hawsey, Robert A. (Oak Ridge, TN); Bailey, J. Milton (Knoxville, TN)

    1992-01-01T23:59:59.000Z

    A brushless dc permanent magnet motor drives an autonomous underwater vehe. In one embodiment, the motor comprises four substantially flat stators in stacked relationship, with pairs of the stators axially spaced, each of the stators comprising a tape-wound stator coil, and first and second substantially flat rotors disposed between the spaced pairs of stators. Each of the rotors includes an annular array of permanent magnets embedded therein. A first shaft is connected to the first rotor and a second, concentric shaft is connected to the second rotor, and a drive unit causes rotation of the two shafts in opposite directions. The second shaft comprises a hollow tube having a central bore in which the first shaft is disposed. Two different sets of bearings support the first and second shafts. In another embodiment, the motor comprises two ironless stators and pairs of rotors mounted on opposite sides of the stators and driven by counterrotating shafts.

  11. AIAA-982909 Characterization of the Near Wake of a Helicopter Rotor*

    E-Print Network [OSTI]

    of Technology. Abstract Vortex characteristics in the near wake of a 2-bladed teetering rotor in steady forward to be repeatable to within 1° of rotor revolution. Velocity was measured in the planes intersected by the rotor-blade blade side of the rotor. The axial velocity in all cases is wake-like, being directed towards the blade

  12. RESULTS AND DISCUSSION -Part I UH60A Rotor in High Speed Forward Flight

    E-Print Network [OSTI]

    rotor for a number of hover and forward flight conditions. This rotor is a four-bladed configuration.2: Geometric Twist Distribution for the UH-60A Rotor In the experiment, the blades were trimmed to eliminate the one-per-rev flapping. The rotor blade sectional twist including elastic deformation is available

  13. Reference Model 2: %22Rev 0%22 Rotor Design.

    SciTech Connect (OSTI)

    Barone, Matthew F.; Berg, Jonathan Charles; Griffith, Daniel

    2011-12-01T23:59:59.000Z

    The preliminary design for a three-bladed cross-flow rotor for a reference marine hydrokinetic turbine is presented. A rotor performance design code is described, along with modifications to the code to allow prediction of blade support strut drag as well as interference between two counter-rotating rotors. The rotor is designed to operate in a reference site corresponding to a riverine environment. Basic rotor performance and rigid-body loads calculations are performed to size the rotor elements and select the operating speed range. The preliminary design is verified with a simple finite element model that provides estimates of bending stresses during operation. A concept for joining the blades and support struts is developed and analyzed with a separate finite element analysis. Rotor mass, production costs, and annual energy capture are estimated in order to allow calculations of system cost-of-energy. Evaluation Only. Created with Aspose.Pdf.Kit. Copyright 2002-2011 Aspose Pty Ltd Evaluation Only. Created with Aspose.Pdf.Kit. Copyright 2002-2011 Aspose Pty Ltd

  14. Small diameter, deep bore optical inspection system

    DOE Patents [OSTI]

    Lord, David E. (Livermore, CA); Petrini, Richard R. (Livermore, CA); Carter, Gary W. (Livermore, CA)

    1981-01-01T23:59:59.000Z

    An improved rod optic system for inspecting small diameter, deep bores. The system consists of a rod optic system utilizing a curved mirror at the end of the rod lens such that the optical path through the system is bent 90.degree. to minimize optical distortion in examining the sides of a curved bore. The system is particularly useful in the examination of small bores for corrosion, and is capable of examining 1/16 inch diameter and up to 4 inch deep drill holes, for example. The positioning of the curved mirror allows simultaneous viewing from shallow and right angle points of observation of the same artifact (such as corrosion) in the bore hole. The improved rod optic system may be used for direct eye sighting, or in combination with a still camera or a low-light television monitor; particularly low-light color television.

  15. Lasing in microdisks of ultrasmall diameter

    SciTech Connect (OSTI)

    Zhukov, A. E., E-mail: zhukale@gmail.com; Kryzhanovskaya, N. V.; Maximov, M. V.; Lipovskii, A. A.; Savelyev, A. V.; Bogdanov, A. A.; Shostak, I. I.; Moiseev, E. I.; Karpov, D. V. [St. Petersburg Academic University—Nanotechnology Research and Education Center, Russian Academy of Sciences (Russian Federation); Laukkanen, J. [University of Eastern Finland, Institute of Photonics (Finland); Tommila, J. [Tampere University of Technology, Optoelectronics Research Centre (Finland)

    2014-12-15T23:59:59.000Z

    It is demonstrated by calculations and experimental results that room-temperature lasing can be obtained at the ground-state optical transition of InAs/InGaAs/GaAs quantum dots in optical microcavities with a record-small diameter of 1.5 ?m. In 1-?m cavities, lasing occurs at the wavelength of one of the whispering-gallery modes within the band corresponding to the first excited-state optical transition.

  16. Control coil arrangement for a rotating machine rotor

    DOE Patents [OSTI]

    Shah, Manoj R. (Latham, NY); Lewandowsk, Chad R. (Amsterdam, NY)

    2001-07-31T23:59:59.000Z

    A rotating machine (e.g., a turbine, motor or generator) is provided wherein a fixed solenoid or other coil configuration is disposed adjacent to one or both ends of the active portion of the machine rotor for producing an axially directed flux in the active portion so as to provide planar axial control at single or multiple locations for rotor balance, levitation, centering, torque and thrust action. Permanent magnets can be used to produce an axial bias magnetic field. The rotor can include magnetic disks disposed in opposed, facing relation to the coil configuration.

  17. Synchronization and Collective Dynamics in a Carpet of Microfluidic Rotors

    E-Print Network [OSTI]

    Nariya Uchida; Ramin Golestanian

    2010-04-28T23:59:59.000Z

    We study synchronization of an array of rotors on a substrate that are coupled by hydrodynamic interaction. The rotors that are modeled by an effective rigid body, are driven by an internal torque and exerts an active force on the surrounding fluid. The long-ranged nature of the hydrodynamic interaction between the rotors causes a rich pattern of dynamical behaviors including phase ordering and turbulent spiral waves. The model provides a novel example of coupled oscillators with long-range interaction. Our results suggest strategies for designing controllable microfluidic mixers using the emergent behavior of hydrodynamically coupled active components.

  18. Tip cap for a turbine rotor blade

    DOE Patents [OSTI]

    Kimmel, Keith D

    2014-03-25T23:59:59.000Z

    A turbine rotor blade with a spar and shell construction, and a tip cap that includes a row of lugs extending from a bottom side that form dovetail grooves that engage with similar shaped lugs and grooves on a tip end of the spar to secure the tip cap to the spar against radial displacement. The lug on the trailing edge end of the tip cap is aligned perpendicular to a chordwise line of the blade in the trailing edge region in order to minimize stress due to the lugs wanting to bend under high centrifugal loads. A two piece tip cap with lugs at different angles will reduce the bending stress even more.

  19. Diameter-Refined Metallic Carbon Nanotubes as Optically Tunable...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Diameter-Refined Metallic Carbon Nanotubes as Optically Tunable Transparent Conductors Home > Research > ANSER Research Highlights > Diameter-Refined Metallic Carbon Nanotubes as...

  20. Lean implementation across value stream in main rotor blade area

    E-Print Network [OSTI]

    Phoenix, Casey J. (Casey John)

    2007-01-01T23:59:59.000Z

    The primary goal for this project was to help expand the existing capability of Sikorsky's main rotor blade business from raw material (titanium) through final assembly. The project helped to facilitate the ongoing lean ...

  1. Methods and apparatus for rotor blade ice detection

    DOE Patents [OSTI]

    LeMieux, David Lawrence

    2006-08-08T23:59:59.000Z

    A method for detecting ice on a wind turbine having a rotor and one or more rotor blades each having blade roots includes monitoring meteorological conditions relating to icing conditions and monitoring one or more physical characteristics of the wind turbine in operation that vary in accordance with at least one of the mass of the one or more rotor blades or a mass imbalance between the rotor blades. The method also includes using the one or more monitored physical characteristics to determine whether a blade mass anomaly exists, determining whether the monitored meteorological conditions are consistent with blade icing; and signaling an icing-related blade mass anomaly when a blade mass anomaly is determined to exist and the monitored meteorological conditions are determined to be consistent with icing.

  2. Methods and apparatus for rotor load control in wind turbines

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw

    2006-08-22T23:59:59.000Z

    A wind turbine having a rotor, at least one rotor blade, and a plurality of generators, of which a first generator is configured to provide power to an electric grid and a second generator is configured to provide power to the wind turbine during times of grid loss. The wind turbine is configured to utilize power provided by the second generator to reduce loads on the wind turbine during times of grid loss.

  3. Structural testing of the North Wind 250 composite rotor joint

    SciTech Connect (OSTI)

    Musial, W; Link, H [National Renewable Energy Lab., Golden, CO (United States); Coleman, C [Northern Power Systems, Moretown, VT (United States)

    1994-05-01T23:59:59.000Z

    The North Wind 250 wind turbine is under development at Northern Power Systems (NPS) in Moretown, VT. The turbine uses a unique, flow-through, teetered-rotor design. This design eliminates structural discontinuities at the blade/hub interface by fabricating the rotor as one continuous structural element. To accomplish this, the two blade spars are joined at the center of the rotor using a proprietary bonding technique. Fatigue tests were conducted on the full-scale rotor joint at the National Renewable Energy Laboratory (NREL). Subsequent tests are now underway to test the full-scale rotor and hub assembly to verify the design assumptions. The test articles were mounted in dedicated test fixtures. For the joint test, a constant moment was generated across the joint and parent material. Hydraulic actuators applied sinusoidal loading to the test article at levels equivalent to 90% of the extreme wind load for over one million cycles. When the loading was increased to 112% of the extreme wind load, the joint failed by buckling. Strain levels were monitored at 14 locations inside and outside of the blade joint during the test. The tests were used to qualify this critical element of the rotor for field testing and to provide information needed to improve the structural design of the joint.

  4. Manufacturing and properties of newly developed 9%CrMoVNiNbN high-pressure low-pressure rotor shaft forging

    SciTech Connect (OSTI)

    Azuma, Tsukasa; Tanaka, Yasuhiko; Ishiguro, Tohru; Yoshida, Hajime; Ikeda, Yasumi [Japan Steel Works, Muroran (Japan)

    1997-12-31T23:59:59.000Z

    In order to obtain the improved strength and toughness for high-pressure low-pressure rotor shaft forging, fundamental studies using laboratory heats were performed on the 9CrMoV base materials, and effects of chemistry on toughness and creep rupture strength were investigated. From the investigation, it is showed that the superclean 9CrMoVNiNbN steel with reduced Si and Mn contents and Ni addition provides a superior strength versus toughness balance. Based on these fundamental studies, a trial high-pressure low-pressure rotor shaft forging with diameter of low-pressure section of 1,750 mm and diameter of high-pressure section of 1,200 mm was successfully manufactured from the diameter of 1,800 mm, and the weight of 65 ton ESR ingot. From the evaluation test results of this trial rotor forging, homogeneous distribution of chemistry was confirmed and low impurity contents was observed in the whole forging. The superior strength and toughness were confirmed with good creep rupture strength. The FATT at the center of low-pressure section was {minus}3 C with the tensile strength level of 870 MPa. From the results of fracture toughness test, low cycle fatigue test, and isothermal aging test, superior mechanical properties were demonstrated. Thus, the superclean 9CrMoVNiNbN steel with reduced Si and Mn contents and Ni addition, is particularly suitable for the high-pressure low-pressure rotor material for advanced combined cycle power plants.

  5. Rigid-rotor, field-reversed configuration

    SciTech Connect (OSTI)

    Conti, F., E-mail: conti@df.unipi.it; Giammanco, F. [Physics Department “E. Fermi,” University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa (Italy) [Physics Department “E. Fermi,” University of Pisa, Largo B. Pontecorvo 3, 56127 Pisa (Italy); Plasma Diagnostics and Technologies Ltd., Via Giuntini 63, 56023 Navacchio (PI) (Italy); Wessel, F. J.; Binderbauer, M. W.; Bolte, N.; Morehouse, M.; Qerushi, A.; Rahman, H. U.; Roche, T.; Slepchenkov, M. [Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688 (United States)] [Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688 (United States)

    2014-02-15T23:59:59.000Z

    The radial profiles, n(r), B{sub z}(r), and E{sub r}(r), for a Flux-Coil (“inductively driven”), Field-Reversed Configuration (FC-FRC) are measured and compared to the predictions of the Rigid-Rotor Model (RRM), which is an analytic, one-dimensional, time-independent, equilibrium description for the FRC. Injectors mounted on both ends of the confinement vessel provide a pre-fill plasma. Coaxial coils mounted outside the vacuum boundaries of the annular-confinement vessel accelerate the plasma and produce the FRC. The density profile is measured by laser interferometry, the magnetic-field profile using an in-situ probe array, and the electric-field profile using an in-situ, floating-probe array. Free parameters for each profile are measured, which also allow other intrinsic-plasma parameters to be determined, using computer-fit algorithms: null radius, radial thickness, plasma temperature, rotation frequencies, the latter of which are independently verified by spectroscopy. All radial profiles agree with the RRM predictions, for the experimental configuration, parameter regime, and specified-time interval studied here.

  6. Method and apparatus for assembling permanent magnet rotors

    DOE Patents [OSTI]

    Hsu, J.S.; Adams, D.J.

    1999-06-22T23:59:59.000Z

    A permanent magnet assembly for assembly in large permanent magnet motors and generators includes a two-piece carrier that can be slid into a slot in the rotor and then secured in place using a set screw. The invention also provides an auxiliary carrier device with guide rails that line up with the teeth of the rotor, so that a permanent magnet assembly can be pushed first into a slot, and then down the slot to its proper location. An auxiliary tool is provided to move the permanent magnet assembly into position in the slot before it is secured in place. Methods of assembling and disassembling the magnet assemblies in the rotor are also disclosed. 2 figs.

  7. Operating Modes of a Teeter-Rotor Wind Turbine

    SciTech Connect (OSTI)

    Bir, G. S. (National Renewable Energy Laboratory); Stol, K. (University of Colorado at Boulder)

    1999-02-25T23:59:59.000Z

    We examine the operating modes of a two-bladed teetered wind turbine. Because of the gyroscopic asymmetry of its rotor, this turbine's dynamics can be quite distinct from those of a turbine with three or more blades. This asymmetry leads to system equations with periodic coefficients that are solved using the Floquet approach to extract the correct modal parameters. The system equations are derived using a simple analytical model with four degrees of freedom: cacelle yaw, rotor teeter, and flapping associated with each blade. Results confirm that the turbine modes become more dominated by the centrifugal and gyroscopic effects as the rotor speed increases. They gyroscopic effect may also cause dynamic instability. Under certain design conditions, yaw and teeter modal frequencies may coalesce.

  8. BASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA,

    E-Print Network [OSTI]

    Parker, Gary B.

    more difficult to control, requiring minute adjustments to individual rotor blades, as well as tailBASIC CONTROL FOR FOUR ROTOR AUTONOMOUS AERIAL AGENT JONATHAN MCLEAN, CONNECTICUT COLLEGE, USA platform is required. Our four-rotor platform provides researchers with a inexpensive, fully scalable test

  9. Computational Modeling of Rotor Blade Performance Degradation Due to Ice Accretion

    E-Print Network [OSTI]

    Maroncelli, Mark

    PENNSTATE _ Computational Modeling of Rotor Blade Performance Degradation Due to Ice Accretion, 2013 9:00 a.m. 301 Steidle Building Ice accretion on helicopter rotor blades can cause significant. If unabated, rotor ice can accumulate to the point where the vehicle can no longer maintain flight

  10. FAULT DETECTION AND STATE EVALUATION OF ROTOR BLADES Yuri Petryna, Andreas Knzel, Matthias Kannenberg

    E-Print Network [OSTI]

    Boyer, Edmond

    FAULT DETECTION AND STATE EVALUATION OF ROTOR BLADES Yuri Petryna, Andreas Künzel, Matthias an approach for cost-effective, serial integrity tests of rotor blades. At that, manufacturing faults shall be automatically detected, localized and assessed with respect to their impact on the integrity of rotor blades

  11. Reduction of multi-stage disk models: Application to an industrial rotor

    E-Print Network [OSTI]

    Boyer, Edmond

    of the rotor into sectors. The bladed disks are coupled by intermediate rings which remove the problem that of a small portion, typically a bladed sector. This configuration no longer holds in real rotors due with multi-stage rotors. However, as underlined by Bladh et al.6 , the critical point is the choice

  12. RESULTS AND DISCUSSION Part II AH-1G ROTOR IN LOW SPEED DESCENT FLIGHT

    E-Print Network [OSTI]

    , results are presented for a two-bladed AH-1G rotor in a low-speed descent condition. In low speed forward and Acoustics Test (TAAT) was conducted on an AH-1G Cobra. It used highly instrumented rotor blades direction. The inner Navier-Stokes zone includes about 39% of the total grid points. The rotor has

  13. DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES

    E-Print Network [OSTI]

    Boyer, Edmond

    DETECTION OF IMPULSE-LIKE AIRBORNE SOUND FOR DAMAGE IDENTIFICATION IN ROTOR BLADES OF WIND TURBINES burdens of wind turbines. To detect damage of rotor blades, several research projects focus on an acoustic, rotor blade, wind turbine INTRODUCTION There are several publications of non destructive damage

  14. American Institute of Aeronautics Astronautics DEVELOPMENT OF UNSTEADINESS IN A ROTOR WAKE

    E-Print Network [OSTI]

    - speed forward flight (or cross-wind), where the wake is swept behind the rotor, the effect of ground1 American Institute of Aeronautics Astronautics DEVELOPMENT OF UNSTEADINESS IN A ROTOR WAKE Georgia Institute of Technology Atlanta, GA 30332-0150 ABSTRACT The flow field around the rotor in ground

  15. Study of the non-linear dynamic response of a rotor system with faults and uncertainties

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the non-linear re- sponse in rotor systems with multi-faults (such as unbalance, asymmetric shaft, bow and Ferraris in fixed frame [10]. · The bow is an initial deformation of the rotor which can be caused) or all parts of the rotor (extended bow). Darpe [12] proposes to investigate the influence of a bow

  16. LOSS OF ROTOR ISOTROPY AS A BLADE DAMAGE INDICATOR FOR WIND TURBINE STRUCTURE HEALTH MONITORING SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    LOSS OF ROTOR ISOTROPY AS A BLADE DAMAGE INDICATOR FOR WIND TURBINE STRUCTURE HEALTH MONITORING to simulated vibrations of a rotating rotor. KEYWORDS : wind turbine blade, rotor anisotropy, Floquet analysis, OMA INTRODUCTION Blades of modern wind turbines are complex high-tech structures, and their cost

  17. TLA-55 Rotor Used in Beckman Coulter OptimaTM

    E-Print Network [OSTI]

    Pawlowski, Wojtek

    Ultracentrifuges Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo should be read and understood before operation or maintenance of this equipment is attempted. When you, and tested for safety and reliability as part of a Beckman Coulter ultracentrifuge/rotor system. Its safety

  18. Single Molecular Rotor at the Nanoscale Christian Joachim1

    E-Print Network [OSTI]

    Gimzewski, James

    �schlikon, Switzerland E-mail: gim@zurich.ibm.com The design of a monomolecular engine such as a rotating motor ®rst requires the preparation of a semi-classical rotating motion of the rotor part of the engine. We show versions of machines in our daily life, using the same working principles such as, for instance, a steam

  19. Phase modulated rotor angle encoder for switched reluctance motor drive

    E-Print Network [OSTI]

    Mahajan, Shailendra

    1993-01-01T23:59:59.000Z

    sensor. In an inexpensive systein, the rotor position sensor comprises of a magnetized ring along with Hall etfect sensors or opto-interrupters with slotted clisk. An optical sensor has a, light emitting diode which acts as a light transmitter, enid a...

  20. DEVELOPMENT OF TIP CLEARANCE FLOW DOWNSTREAM OF A ROTOR BLADE WITH COOLANT INJECTION FROM A TIP TRENCH

    E-Print Network [OSTI]

    Camci, Cengiz

    DEVELOPMENT OF TIP CLEARANCE FLOW DOWNSTREAM OF A ROTOR BLADE WITH COOLANT INJECTION FROM A TIP Rotor blade height Um Mean wheel speed, i.e. midspan rotor speed Absolute flow angle measured from the nozzle guide vane and the rotor blade need to be cooled adequately in order to maintain the 1 #12

  1. Performance of twist-coupled blades on variable speed rotors

    SciTech Connect (OSTI)

    Lobitz, D.W.; Veers, P.S.; Laino, D.J.

    1999-12-07T23:59:59.000Z

    The load mitigation and energy capture characteristics of twist-coupled HAWT blades that are mounted on a variable speed rotor are investigated in this paper. These blades are designed to twist toward feather as they bend with pretwist set to achieve a desirable twist distribution at rated power. For this investigation, the ADAMS-WT software has been modified to include blade models with bending-twist coupling. Using twist-coupled and uncoupled models, the ADAMS software is exercised for steady wind environments to generate C{sub p} curves at a number of operating speeds to compare the efficiencies of the two models. The ADAMS software is also used to generate the response of a twist-coupled variable speed rotor to a spectrum of stochastic wind time series. This spectrum contains time series with two mean wind speeds at two turbulence levels. Power control is achieved by imposing a reactive torque on the low speed shaft proportional to the RPM squared with the coefficient specified so that the rotor operates at peak efficiency in the linear aerodynamic range, and by limiting the maximum RPM to take advantage of the stall controlled nature of the rotor. Fatigue calculations are done for the generated load histories using a range of material exponents that represent materials from welded steel to aluminum to composites, and results are compared with the damage computed for the rotor without twist-coupling. Results indicate that significant reductions in damage are achieved across the spectrum of applied wind loading without any degradation in power production.

  2. Optimum rotationally symmetric shells for flywheel rotors

    DOE Patents [OSTI]

    Blake, Henry W. (Oak Ridge, TN)

    2000-01-01T23:59:59.000Z

    A flywheel rim support formed from two shell halves. Each of the shell halves has a disc connected to the central shaft. A first shell element connects to the disc at an interface. A second shell element connects to the first shell element. The second shell element has a plurality of meridional slits. A cylindrical shell element connects to the second shell element. The cylindrical shell element connects to the inner surface of the flywheel rim. A flywheel rim support having a disc connected an outer diameter of a shaft. Two optimally shaped shell elements connect to the optimally shaped disc at an interface. The interface defines a discontinuity in a meridional slope of said support. A cylindrical shell element connects to the two shell elements. The cylindrical shell element has an outer surface for connecting to the inner surface of the flywheel rim. A flywheel rim casing includes an annular shell connected to the central shaft. The annular shell connects to the flywheel rim. A composite shell surrounds the shaft, annular shell and flywheel rim.

  3. Active Flow Control on Bidirectional Rotors for Tidal MHK Applications

    SciTech Connect (OSTI)

    Shiu, Henry [Research Engineer; van Dam, Cornelis P. [Professor

    2013-08-22T23:59:59.000Z

    A marine and hydrokinetic (MHK) tidal turbine extracts energy from tidal currents, providing clean, sustainable electricity generation. In general, all MHK conversion technologies are confronted with significant operational hurdles, resulting in both increased capital and operations and maintenance (O&M) costs. To counter these high costs while maintaining reliability, MHK turbine designs can be simplified. Prior study found that a tidal turbine could be cost-effectively simplified by removing blade pitch and rotor/nacelle yaw. Its rotor would run in one direction during ebb and then reverse direction when the current switched to flood. We dubbed such a turbine a bidirectional rotor tidal turbine (BRTT). The bidirectional hydrofoils of a BRTT are less efficient than conventional hydrofoils and capture less energy, but the elimination of the pitch and yaw systems were estimated to reduce levelized cost of energy by 7.8%-9.6%. In this study, we investigated two mechanisms for recapturing some of the performance shortfall of the BRTT. First, we developed a novel set of hydrofoils, designated the yy series, for BRTT application. Second, we investigated the use of active flow control via microtabs. Microtabs are small deployable/retractable tabs, typically located near the leading or trailing edge of an air/hydrofoil with height on the order of the boundary layer thickness (1% - 2% of chord). They deploy approximately perpendicularly to the foil surface and, like gurney flaps and plain flaps, globally affect the aerodynamics of the airfoil. By strategically placing microtabs and selectively deploying them based on the direction of the inflow, performance of a BRTT rotor can be improved while retaining bidirectional operation. The yy foils were computationally designed and analyzed. They exhibited better performance than the baseline bidirectional foil, the ellipse. For example, the yyb07cn-180 had 14.7% higher (l/d)max than an ellipse of equal thickness. The yyb07cn family also had higher c{sub p,min} than equivalently thick ellipses, indicating less susceptibility to cavitation. Microtabs applied on yy foils demonstrated improved energy capture. A series of variable speed and constant speed rotors were developed with the yyb07cn family of hydrofoils. The constant speed yyb07cn rotor (yy-B02-Rcs,opt) captured 0.45% more energy than the equivalent rotor with ellipses (e-B02-Rcs,opt). With microtabs deployed (yy?t-B02-Rcs,opt), the energy capture increase over the rotor with ellipses was 1.05%. Note, however, that microtabs must be applied judiciously to bidirectional foils. On the 18% thick ellipse, performance decreased with the addition of microtabs. Details of hydrofoil performance, microtab sizing and positioning, rotor configurations, and revenue impacts are presented herein.

  4. Sweep-twist adaptive rotor blade : final project report.

    SciTech Connect (OSTI)

    Ashwill, Thomas D.

    2010-02-01T23:59:59.000Z

    Knight & Carver was contracted by Sandia National Laboratories to develop a Sweep Twist Adaptive Rotor (STAR) blade that reduced operating loads, thereby allowing a larger, more productive rotor. The blade design used outer blade sweep to create twist coupling without angled fiber. Knight & Carver successfully designed, fabricated, tested and evaluated STAR prototype blades. Through laboratory and field tests, Knight & Carver showed the STAR blade met the engineering design criteria and economic goals for the program. A STAR prototype was successfully tested in Tehachapi during 2008 and a large data set was collected to support engineering and commercial development of the technology. This report documents the methodology used to develop the STAR blade design and reviews the approach used for laboratory and field testing. The effort demonstrated that STAR technology can provide significantly greater energy capture without higher operating loads on the turbine.

  5. Adaptor assembly for coupling turbine blades to rotor disks

    DOE Patents [OSTI]

    Garcia-Crespo, Andres Jose; Delvaux, John McConnell

    2014-09-23T23:59:59.000Z

    An adaptor assembly for coupling a blade root of a turbine blade to a root slot of a rotor disk is described. The adaptor assembly includes a turbine blade having a blade root and an adaptor body having an adaptor root. The adaptor body defines a slot having an open end configured to receive the blade root of the turbine blade such that the adaptor root of the adaptor body and the blade root of the turbine blade are adjacent to one another when the blade root of the turbine blade is positioned within the slot. Both the adaptor root of the adaptor body and the blade root of the turbine blade are configured to be received within the root slot of the rotor disk.

  6. Analysis of a teetered, variable-speed rotor: final report

    SciTech Connect (OSTI)

    Weber, T.L.; Wilson, R.E.; Walker, S.N. (Oregon State Univ., Corvallis, OR (USA). Dept. of Mechanical Engineering) [Oregon State Univ., Corvallis, OR (USA). Dept. of Mechanical Engineering

    1991-06-01T23:59:59.000Z

    A computer model of a horizontal axis wind turbine (HOOT) with four structural degrees of freedom has been derived and verified. The four degrees of freedom include flapwise motion of the blades, teeter motion, and variable rotor speed. Options for the variable rotor speed include synchronous, induction, and constant-tip speed generator models with either start, stop, or normal operations. Verification is made by comparison with analytical solutions and mean and cyclic ESI-80 data. The Veers full-field turbulence model is used as a wind input for a synchronous and induction generator test case during normal operation. As a result of the comparison, it is concluded that the computer model can be used to predict accurately mean and cyclic loads with a turbulent wind input. 47 refs., 19 figs.

  7. Preform spar cap for a wind turbine rotor blade

    DOE Patents [OSTI]

    Livingston, Jamie T. (Simpsonville, SC); Driver, Howard D. (Greer, SC); van Breugel, Sjef (Enschede, NL); Jenkins, Thomas B. (Cantonment, FL); Bakhuis, Jan Willem (Nijverdal, NL); Billen, Andrew J. (Daarlerveen, NL); Riahi, Amir (Pensacola, FL)

    2011-07-12T23:59:59.000Z

    A spar cap for a wind turbine rotor blade. The spar cap may include multiple preform components. The multiple preform components may be planar sheets having a swept shape with a first end and a second end. The multiple preform components may be joined by mating the first end of a first preform component to the second end of a next preform component, forming the spar cap.

  8. Embedded Real-Time Systems Electrical Model Quad Rotor UAV

    E-Print Network [OSTI]

    Langendoen, Koen

    Sys (2013-2014) #12;10 System SW view joystick QR PC link PC lift roll pitch yaw sensorsES joystickIn4073 Embedded Real-Time Systems Electrical Model Quad Rotor UAV #12;2 TE0300 FPGA System HW view), pitch rate (M), and yaw rate (N) (see qrsim for example!) x z y engine 4 engine 3 engine 2 engine 1 In

  9. Oxygen-Diffused Titanium as a Candidate Brake Rotor Material

    SciTech Connect (OSTI)

    Qu, Jun [ORNL; Blau, Peter Julian [ORNL; Jolly, Brian C [ORNL

    2009-01-01T23:59:59.000Z

    Titanium alloys are one of several candidate materials for the next generation of truck disk brake rotors. Despite their advantages of lightweight relative to cast iron and good strength and corrosion resistance, titanium alloys are unlikely to be satisfactory brake rotor materials unless their friction and wear behavior can be significantly improved. In this study, a surface engineering process oxygen diffusion was applied to titanium rotors and has shown very encouraging results. The oxygen diffused Ti-6Al-4V (OD-Ti) was tested on a sub-scale brake tester against a flat block of commercial brake lining material and benchmarked against several other Ti-based materials, including untreated Ti-6Al-4V, ceramic particle-reinforced Ti composites (MMCs), and a thermal-spray-coated Ti alloy. With respect to friction, the OD-Ti outperformed all other candidate materials under the imposed test conditions with the friction coefficient remaining within a desirable range of 0.35-0.50, even under the harshest conditions when the disk surface temperature reached nearly 600 ?C. In addition, the OD-Ti showed significantly improved wear-resistance over the non-treated one and was even better than the Ti-based composite materials.

  10. Blade platform seal for ceramic/metal rotor assembly

    DOE Patents [OSTI]

    Wertz, John L. (Indianapolis, IN)

    1982-01-01T23:59:59.000Z

    A combination ceramic and metal turbine rotor for use in high temperature gas turbine engines includes a metal rotor disc having a rim with a plurality of circumferentially spaced blade root retention slots therein to receive a plurality of ceramic blades, each including side platform segments thereon and a dovetail configured root slidably received in one of the slots. Adjacent ones of the platform segments including edge portions thereon closely spaced when the blades are assembled to form expansion gaps in an annular flow surface for gas passage through the blades and wherein the assembly further includes a plurality of unitary seal members on the rotor connected to its rim and each including a plurality of spaced, axially extending, flexible fingers that underlie and conform to the edge portions of the platform segments and which are operative at turbine operating temperatures and speeds to distribute loading on the platform segments as the fingers are seated against the underside of the blade platforms to seal the gaps without undesirably stressing thin web ceramic sections of the platform.

  11. Preliminary structural design conceptualization for composite rotor for verdant power water current turbine

    SciTech Connect (OSTI)

    Paquette, J. A.

    2012-03-01T23:59:59.000Z

    Sandia National Laboratories (SNL) and Verdant Power Inc. (VPI) have partnered under a Cooperative Research and Development Agreement (CRADA) to develop a new kinetic hydropower rotor. The rotor features an improved hydrodynamic and structural design which features state-of-the-art technology developed for the wind industry. The new rotor will have higher energy capture, increased system reliability, and reduction of overall cost of energy. This project was divided into six tasks: (1) Composite Rotor Project Planning and Design Specification; (2) Baseline Fatigue Testing and Failure analysis; (3) Develop Blade/Rotor Performance Model; (4) Hydrofoil Survey and Selection; (5) FEM Structural Design; and (6) Develop Candidate Rotor Designs and Prepare Final Report.

  12. CFD analysis of rotating two-bladed flatback wind turbine rotor.

    SciTech Connect (OSTI)

    van Dam, C.P. (University of California, David, CA); Chao, David D.; Berg, Dale E. (University of California, David, CA)

    2008-04-01T23:59:59.000Z

    The effects of modifying the inboard portion of the NREL Phase VI rotor using a thickened, flatback version of the S809 design airfoil are studied using a three-dimensional Reynolds-averaged Navier-Stokes method. A motivation for using such a thicker airfoil design coupled with a blunt trailing edge is to alleviate structural constraints while reducing blade weight and maintaining the power performance of the rotor. The calculated results for the baseline Phase VI rotor are benchmarked against wind tunnel results obtained at 10, 7, and 5 meters per second. The calculated results for the modified rotor are compared against those of the baseline rotor. The results of this study demonstrate that a thick, flatback blade profile is viable as a bridge to connect structural requirements with aerodynamic performance in designing future wind turbine rotors.

  13. Pump impeller-shroud leakage path forces: their effect on a Jeffcott rotor

    E-Print Network [OSTI]

    Williams, James Philip

    1988-01-01T23:59:59.000Z

    for finding the frequency of free vibration as well as system stability. All results lead to the conclusion that the forces have little influence on natural frequency but can have appreciable effects on system stability. Specifically, at higher values.... Figure 15. Frequency response: whirl amplitude. Frequency response: phase angle, Rotor orbit during free vibration. Time history of rotor whirl frequency ratio during free vibration, 32 32 36 36 Figure 16. Figure 17. Rotor orbit during...

  14. The Non-Homologous Nature of Solar Diameter Variations

    E-Print Network [OSTI]

    Sabatino Sofia; Sarbani Basu; Pierre Demarque; Linghuai Li; Gerard Thuillier

    2005-09-27T23:59:59.000Z

    We show in this paper that the changes of the solar diameter in response to variations of large scale magnetic fields and turbulence are not homologous. For the best current model, the variation at the photospheric level is over 1000 times larger than the variation at a depth of 5 Mm, which is about the level at which f-mode solar oscillations determine diameter variations. This model is supported by observations that indicate larger diameter changes for high degree f-modes than for low degree f-modes, since energy of the former are concentrated at shallower layers than the latter.

  15. Toughness of Cr-Mo-V steels for steam-turbine rotors

    SciTech Connect (OSTI)

    Viswanathan, R.; Jaffee, R.I.

    1982-04-01T23:59:59.000Z

    Cr-Mo-V steels are used extensively as the rotor material in the High Pressure and Intermediate Pressure Sections of modern steam turbines. The toughness of these rotors has a major influence on the reliability and efficiency of the turbine and the overall economy of operation and maintenance of the plant. The metallurgical factors affecting the toughness of the rotors and the methods to improve the toughness are now understood better than ever before. This paper will present a broad overview of the materials and design aspects of the toughness of Cr-Mo-V rotors with emphasis on the salient results of recent research programs aimed at improving their toughness.

  16. Tuning thermal mismatch between turbine rotor parts with a thermal medium

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2001-01-01T23:59:59.000Z

    In a turbine rotor, an aft shaft wheel and the final-stage wheel of the rotor are coupled together, including by a rabbeted joint. During shutdown and startup of the turbine, a thermal mismatch between the aft shaft wheel and final-stage wheel is avoided by respectively heating and cooling the aft shaft wheel to maintain the thermal mismatch within acceptable limits, thereby avoiding opening of the rabbeted joint and the potential for unbalancing the rotor and rotor vibration. The thermal medium may be supplied by piping in the aft bearing cavity into the cavity between the forward closure plate and the aft shaft wheel.

  17. Methods and apparatus for reduction of asymmetric rotor loads in wind turbines

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw; Pierce, Kirk Gee

    2006-10-10T23:59:59.000Z

    A method for reducing load and providing yaw alignment in a wind turbine includes measuring displacements or moments resulting from asymmetric loads on the wind turbine. These measured displacements or moments are used to determine a pitch for each rotor blade to reduce or counter asymmetric rotor loading and a favorable yaw orientation to reduce pitch activity. Yaw alignment of the wind turbine is adjusted in accordance with the favorable yaw orientation and the pitch of each rotor blade is adjusted in accordance with the determined pitch to reduce or counter asymmetric rotor loading.

  18. Design Assessments of a Magnetic-geared Double-rotor Permanent Magnet Generator.

    E-Print Network [OSTI]

    Chung, He-Yu

    2013-01-01T23:59:59.000Z

    ??The purpose of this research is to provide systematic design of a permanent magnet (PM) generator, by adopting the double-rotor and the coaxial magnetic gear… (more)

  19. airway diameter behavior: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of the interionic Boyer, Edmond 149 Affect of Viscosity and Droplet Diameter on water-in-oil (wo) Emulsions: An Experimental Study CiteSeer Summary: AbstractThe influence of...

  20. Pressure drop with surface boiling in small-diameter tubes

    E-Print Network [OSTI]

    Dr?mer, Thomas

    1964-01-01T23:59:59.000Z

    Pressure drop for water flowing in small-diameter tubes under isothermal, nonboiling, and surface-boiling conditions was investigated. Experimental results for local pressure gradient and heattransfer coefficients are ...

  1. Gravitational lensing and the angular-diameter distance relation

    E-Print Network [OSTI]

    Fedja Hadrovic; James Binney

    1997-08-13T23:59:59.000Z

    We show that the usual relation between redshift and angular-diameter distance can be obtained by considering light from a source to be gravitationally lensed by material that lies in the telescope beam as it passes from source to observer through an otherwise empty universe. This derivation yields an equation for the dependence of angular diameter on redshift in an inhomogeneous universe. We use this equation to model the distribution of angular-diameter distance for redshift z=3 in a realistically clustered cosmology. The distribution is such that attempts to determine q_0 from angular-diameter distances will systematically underestimate q_0 by ~0.15, and large samples would be required to beat down the intrinsic dispersion in measured values of q_0.

  2. Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On-Line Disturbance Data

    E-Print Network [OSTI]

    Neural Network Based Modeling of a Large Steam Turbine-Generator Rotor Body Parameters from On technique to estimate and model rotor- body parameters of a large steam turbine-generator from real time

  3. Hybrid Rotor Compression for Multiphase and Liquids-Rich Wellhead

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsingFun withconfinement plasmasSandy-Nor'easter SituationHybrid Hybrid Rotor

  4. The Ultra-micro Wave Rotor Research at Michigan State University Florin Iancu, Janusz Piechna*

    E-Print Network [OSTI]

    Müller, Norbert

    University of Technology 24 Nowowiejska Str., 00-665 Warsaw, Poland ABSTRACT Ultra Micro Gas Turbines (Uµ concepts of incorporating a wave rotor to an ultra-micro gas turbine and the advantages of wave rotors be estimated at about 70%. 1. INTRODUCTION Starting in 1995, with the MIT "Micro Gas Turbine" project

  5. Nonlinear Dynamics of a Rotor Supported by Homopolar Magnetic Bearings with Saturation

    E-Print Network [OSTI]

    Kang, Kyungdae

    2011-02-22T23:59:59.000Z

    magnetic bearing model. The nonlinear dynamics of permanent magnet-biased homopolar magnetic bearing (PMB HoMB) system with 2-dof rigid and 4-dof flexible rotor is analyzed. The dynamic behavior of the rotor-bearing system is examined in the feedback...

  6. H-G Diagram Based Rotor Parameters Identification for Induction Motors Thermal Monitoring

    E-Print Network [OSTI]

    Brest, Université de

    H-G Diagram Based Rotor Parameters Identification for Induction Motors Thermal Monitoring Mohamed: In this paper, an effective on-line method for induction motor parameter identification, especially rotor for each operating point. Computer simulations and experimental tests, carried out for a 4-kW four

  7. Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow

    E-Print Network [OSTI]

    Boyer, Edmond

    Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow S in a rotor-stator cavity subjected to a superimposed throughflow with heat transfer. Nu- merical predictions field from the heat transfer process. The turbulent flux is approximated by a gradient hypothesis

  8. Numerical Investigation of a Wind Turbine Rotor with an aerodynamically redesigned hub-region

    E-Print Network [OSTI]

    Numerical Investigation of a Wind Turbine Rotor with an aerodynamically redesigned hub-region J methods on a redesigned modern Mega-Watt sized wind turbine, where the new design includes an increase of the blade in the vicinity of the wind turbine nacelle, to obtain an aerodynamically more efficient rotor

  9. RIS0-M-2432 SIMPLIFIED LAWS OF SIMIALRITY FOR WIND TURBINE ROTORS

    E-Print Network [OSTI]

    RIS0-M-2432 SIMPLIFIED LAWS OF SIMIALRITY FOR WIND TURBINE ROTORS Helge Petersen The Test Station for Small Windmills Abstract, Laws of similarity or scaling laws for the character- istics of a wind turbine rotor are of importance to the designer even during the initial design phase of a new wind turbine con

  10. Thermodynamic Cycle Analysis for Wave Rotor Combustor Based Combined Cycle Jessica Collins1

    E-Print Network [OSTI]

    Zhou, Yaoqi

    Thermodynamic Cycle Analysis for Wave Rotor Combustor Based Combined Cycle Jessica Collins1 , Brian of Engineering and Technology The conventional combustor that exists in today's market is a constant pressure device; whereas, the wave rotor combustor investigated in the present research is a constant volume

  11. RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*,

    E-Print Network [OSTI]

    Giurgiutiu, Victor

    RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. Victor Giurgiutiu*, University of South achievements in the application of active-materials actuation to counteract aeroelastic and vibration effects and capabilities is done first. Attention is focused on the smart rotor-blade applications. The induced twist

  12. Advanced Flywheel Composite Rotors: Low-Cost, High-Energy Density Flywheel Storage Grid Demonstration

    SciTech Connect (OSTI)

    None

    2010-10-01T23:59:59.000Z

    GRIDS Project: Boeing is developing a new material for use in the rotor of a low-cost, high-energy flywheel storage technology. Flywheels store energy by increasing the speed of an internal rotor —slowing the rotor releases the energy back to the grid when needed. The faster the rotor spins, the more energy it can store. Boeing’s new material could drastically improve the energy stored in the rotor. The team will work to improve the storage capacity of their flywheels and increase the duration over which they store energy. The ultimate goal of this project is to create a flywheel system that can be scaled up for use by electric utility companies and produce power for a full hour at a cost of $100 per kilowatt hour.

  13. VOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine

    E-Print Network [OSTI]

    Giles, Mike

    on the rotor blade, reflects upstream, and then reflects again off the stator blade Presented as Paper 88 and shows the large unsteadiness in the lift on the rotor blade. Basic NumericalMethod The flowfiVOL. 6, NO. 5, SEPT.-OCT. 1990 J. PROPULSION 621 Stator/Rotor Interaction in a Transonic Turbine

  14. Planar velocity measurements in two rotorcraft flows are presented. The first is that of an isolated rotor

    E-Print Network [OSTI]

    -light-based measurement system. The second flowfield is that of a rotor wake interacting with a fixed wing in a wind field. Isolated rotor in axial flight Substantial uncertainties remain in modeling the wake typical of a full-scale rotor wake. The clean periodicity of this flow allows capture of fundamental

  15. ORIGINAL PAPER Hydraulic properties and embolism in small-diameter

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ORIGINAL PAPER Hydraulic properties and embolism in small-diameter roots of five temperate broad & Context It has been estimated that about half of a plant's total hydraulic resistance is located belowground, but it is not well known how temperate tree species differ in root hydraulic properties and how

  16. Absolute Calibration of a Large-diameter Light Source

    E-Print Network [OSTI]

    Brack, J T; Dorofeev, A; Gookin, B; Harton, J L; Petrov, Y; Rovero, A C

    2013-01-01T23:59:59.000Z

    A method of absolute calibration for large aperture optical systems is presented, using the example of the Pierre Auger Observatory fluorescence detectors. A 2.5 m diameter light source illuminated by an ultra--violet light emitting diode is calibrated with an overall uncertainty of 2.1 % at a wavelength of 365 nm.

  17. Connector tube for a turbine rotor cooling circuit

    DOE Patents [OSTI]

    Li, Ming Cheng (Cincinnati, OH)

    2003-06-24T23:59:59.000Z

    A tubular connector adapted to extend between two tubular components comprising a tubular body having an internal diameter, a first free end including an annular radial flange having a tapered surface adapted to engage a complementary seating surface on a first of the two tubular components, the internal diameter remaining constant through the first free end; and a second free end having an annular bulbous shape adapted to seat within a cylindrical end of a second of the two tubular components.

  18. WindPACT Turbine Rotor Design Study: June 2000--June 2002 (Revised)

    SciTech Connect (OSTI)

    Malcolm, D. J.; Hansen, A. C.

    2006-04-01T23:59:59.000Z

    This report presents the results of the turbine rotor study completed by Global Energy Concepts (GEC) as part of the U.S. Department of Energy's WindPACT (Wind Partnership for Advanced Component Technologies) project. The purpose of the WindPACT project is to identify technology improvements that will enable the cost of energy from wind turbines to fall to a target of 3.0 cents/kilowatt-hour in low wind speed sites. The study focused on different rotor configurations and the effect of scale on those rotors.

  19. Adaptor assembly for coupling turbine blades to rotor disks

    SciTech Connect (OSTI)

    Delvaux, John McConnel; Garcia-Crespo, Andres Jose; Joyce, Kilmer Joseph; Tindell, Allan Randall

    2014-06-03T23:59:59.000Z

    An adaptor assembly for coupling a blade root of a turbine blade to a root slot of a rotor disk is disclosed. The adaptor assembly may generally include an adaptor body having a root configured to be received within the root slot. The adaptor body may also define a slot having an open end configured to receive the blade root. The adaptor body may further define a channel. The adaptor assembly may also include a plate having an outwardly extending foot. The foot may be configured to be received within the channel. Additionally, the plate may be configured to cover at least a portion of the open end of the slot when the foot is received within the channel.

  20. Vibration analysis of rotor systems using reduced subsystem models

    E-Print Network [OSTI]

    Fan, Uei-Jiun

    1985-01-01T23:59:59.000Z

    and concern. Thanks are also extended to Dr. Alan B. Alter and Dr. Charles F. Rettleborough for their contribution to my academic program at Texas A&M University. NOMENCLATURE [] [A] [Cl [D?l [r?] (F} [G] [l-l ['~, , l ['J, ] Jrz [K] [Ml {p... of the spinning rotor can be written as m. R. Z + f. = f. + m. ai?y + m. ai?p i iZ iZ iX i iX i iY + '2 id&iY ?iY ?iY ' & iP&ix ' e iXZ ' & iYZ (la) 2 ?i id( iX iX ?ix ~ ip~iY ~ iYZ ~iXZ (lb) where / Hydrogen I or o 0 p um'p Hain Combusrion Chamber Z...

  1. Assessment of research needs for wind turbine rotor materials technology

    SciTech Connect (OSTI)

    Not Available

    1991-01-01T23:59:59.000Z

    Wind-driven power systems is a renewable energy technology that is still in the early stages of development. Wind power plants installed in early 1980s suffered structural failures chiefly because of incomplete understanding of wind forces (turbulent), in some cases because of poor product quality. Failures of rotor blades are now somewhat better understood. This committee has examined the experience base accumulated by wind turbines and the R and D programs sponsored by DOE. It is concluded that a wind energy system such as is described is within the capability of engineering practice; however because of certain gaps in knowledge, and the presence of only one major integrated manufacturer of wind power machines in the USA, a DOE R and D investment is still required.

  2. Cooling system for a bearing of a turbine rotor

    DOE Patents [OSTI]

    Schmidt, Mark Christopher (Niskayuna, NY)

    2002-01-01T23:59:59.000Z

    In a gas turbine, a bore tube assembly radially inwardly of an aft bearing conveys cooling steam to the buckets of the turbine and returns the cooling steam to a return. To cool the bearing and thermally insulate the bearing from the cooling steam paths, a radiation shield is spaced from the bore tube assembly by a dead air gap. Additionally, an air passageway is provided between the radiation shield and the inner surface of an aft shaft forming part of the rotor. Air is supplied from an inlet for flow along the passage and radially outwardly through bores in the aft shaft disk to cool the bearing and insulate it from transfer of heat from the cooling steam.

  3. The cost of noise reduction for departure and arrival operations of commercial tilt rotor aircraft

    E-Print Network [OSTI]

    Faulkner, Henry B.

    1976-01-01T23:59:59.000Z

    The relationship between direct operating cost (DOC) and noise annoyance due to a departure and an arrival operation was developed for commercial tilt rotor aircraft. This was accomplished by generating a series of tilt ...

  4. American Institute of Aeronautics and Astronautics Wave Rotor Research Program at Michigan State University

    E-Print Network [OSTI]

    Müller, Norbert

    and power generation purposes including utilization of wave rotors for microturbines, ultra-micro gas turbines, and water refrigeration systems. In collaboration with the research team at Warsaw University

  5. Identification of rotordynamic forces in a flexible rotor system using magnetic bearings

    E-Print Network [OSTI]

    Zutavern, Zachary Scott

    2009-06-02T23:59:59.000Z

    Methods are presented for parameter identification of an annular gas seal on a flexiblerotor test rig. Dynamic loads are applied by magnetic bearings (MBs) that support the rotor. MB forces are measured using fiber-optic strain gauges...

  6. A study of chaos in a rotor system supported by ball bearings

    E-Print Network [OSTI]

    Ortiz, Steven Rey

    2013-02-22T23:59:59.000Z

    . Numerous researchers have published a myriad of papers on the application of chaos theory to mechanical, electrical and biological systems. However, control theories of chaos have been in existence for only a decade and have not been applied to rotor...

  7. An efficient algorithm for blade loss simulations applied to a high-order rotor dynamics problem

    E-Print Network [OSTI]

    Parthasarathy, Nikhil Kaushik

    2004-09-30T23:59:59.000Z

    In this thesis, a novel approach is presented for blade loss simulation of an aircraft gas turbine rotor mounted on rolling element bearings with squeeze film dampers, seal rub and enclosed in a flexible housing. The modal truncation augmentation...

  8. Hybrid gas bearings with controlled supply pressure to eliminate rotor vibrations while crossing system critical speeds

    E-Print Network [OSTI]

    Ryu, Keun

    2009-05-15T23:59:59.000Z

    Micro-turbomachinery (MTM) implements gas bearings in compact units of enhanced mechanical reliability. Gas bearings, however, have little damping and are prone to wear during frequent rotor start-up and shut down conditions. Externally pressurized...

  9. A RIGOROUS, ENGINEER-FRIENDLY APPROACH FOR MODELING REALISTIC, COMPOSITE ROTOR BLADES

    E-Print Network [OSTI]

    Yu, Wenbin

    structures of the type encountered in wind turbine blades, helicopter rotor blades, and the like such as wind turbine blades lead to a splitting of the problem into a (usually) linear, two-dimensional cross

  10. Effects of rotor tip clearance on an embedded compressor stage performance

    E-Print Network [OSTI]

    Sakulkaew, Sitanun

    2012-01-01T23:59:59.000Z

    Compressor efficiency variation with rotor tip gap is assessed using numerical simulations on an embedded stage representative of that in a large industrial gas turbine with Reynolds number being approximately 2 x 106 to ...

  11. UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow

    E-Print Network [OSTI]

    UPWIND, Aerodynamics and aero-elasticity Rotor aerodynamics in atmospheric shear flow Niels N codes for wind turbines utilize aerodynamics based on BEM methods, see [1, 2]. For modern large scale

  12. An embedded controller for quad-rotor flying robots running distributed algorithms

    E-Print Network [OSTI]

    Julian, Brian John

    2009-01-01T23:59:59.000Z

    Multiple collaborating quad-rotor flying robots are useful in a broad range of applications, from surveillance with onboard cameras to reconfiguration of wireless networks. For these applications, it is often advantageous ...

  13. Measurements of imbalance response for a rigid rotor fully supported on squeeze film dampers

    E-Print Network [OSTI]

    Lubell, Daniel Roger

    2000-01-01T23:59:59.000Z

    speeds. Adding damping to a rotor-bearing system reduces vibration amplitudes and provides isolation from the support structure. Squeeze film dampers (SFD), if properly employed, have been shown to effectively provide viscous damping and attenuate...

  14. The effect of teeth-on-stator labyrinth seals on rotor imbalance response

    E-Print Network [OSTI]

    Conway, Eileen Marie

    1991-01-01T23:59:59.000Z

    , diverging and straight refer to the pattern of cleatances between the blades and the rotor in the direction of fluid flow. Figure 2 depicts the seal clearance patterns. Synchronous response tests wctu repeated after installation of each seal to observe...THE EFFECT OF TEETH-ON-STATOR LABYRINTH SEALS ON ROTOR IMBALANCE RESPONSE A Thesis by EILEEN MARIE CONWAY Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER...

  15. Ris-R-1486(EN) KNOW-BLADE Task-3.3 report; Rotor

    E-Print Network [OSTI]

    an array of VGs. The wind turbine blade is the LM19.1 blade equipped with one pair of VGs placed at radiusRisø-R-1486(EN) KNOW-BLADE Task-3.3 report; Rotor Blade Computations with 3D Vortex Generators: KNOW-BLADE Task-3.3 report; Rotor Blade Computations with 3D Vortex Generators Risø-R-1486(EN) January

  16. Imbalance response of a rigid rotor supported on end sealed integral squeeze film dampers

    E-Print Network [OSTI]

    De Santiago Duran, Oscar Cesar

    1998-01-01T23:59:59.000Z

    IMBALANCE RESPONSE OF A RIGID ROTOR SUPPORTED ON END SEALED INTEGRAL SQUEEZE FILM DAMPERS A Thesis by OSCAR CESAR DE SANTIAGO DURAN Submitted to the Ofhce of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1998 Major Subject: Mechanical Engineering IMBALANCE RESPONSE OF A RIGID ROTOR SUPPORTED ON END SEALED INTEGRAL SQUEEZE FILM DAMPERS A Thesis by OSCAR. CESAR DE SANTIAGO DURAN Submitted to Texas ARM University...

  17. Analytical determination of performance degradation on a helicopter main rotor due to ice accretion

    E-Print Network [OSTI]

    Camba, Javier

    1986-01-01T23:59:59.000Z

    ANALYTICAL DETERMINATION OF PERFORMANCE DEGRADATION ON A HELICOPTER MAIN ROTOR DUE TO ICE ACCRETION A Thesis by JAVIER CAMBA III Submitted to the Graduate College of Texas AIIM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1986 Major Subject: Aerospace Engineering ANALYTICAL DETERMINATION OF PERFORMANCE DEGRADATION ON A HELICOPTER MAIN ROTOR DUE TO ICE ACCRETION A Thesis by JAVIER CAMBA III Approval as to style and content by...

  18. Genetic icing effects on forward flight performance of a model helicopter rotor

    E-Print Network [OSTI]

    Tinetti-Sanchez, Ana Fiorella

    1987-01-01T23:59:59.000Z

    GENERIC ICING EFFECTS ON FORWARD FLIGHT PERFORMANCE OF A MODEL HELICOPTER ROTOR A Thesis ANA FIORELLA TINETTI-SANCHEZ Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 1987 Major Subject: Aerospace Engineering GENERIC ICING EFFECTS ON FORWARD FLIGHT PERFORMANCE OF A MODEL HELICOPTER ROTOR A Thesis by ANA FIORELLA TINETTI-SANCHEZ Approved as to style and content by: Kenneth D. Korkan...

  19. How to improve open rotor aerodynamics at cruise and take-off

    E-Print Network [OSTI]

    Hall, Cesare; Zachariadis, Alexios; Brandvik, Tobias; Sohoni, Nishad

    1 Copyright © 2014 University of Cambridge DRAFT – HOW TO IMPROVE OPEN ROTOR AERODYNAMICS AT CRUISE AND TAKE-OFF Cesare Hall, Alexios Zachariadis, Tobias Brandvik, Nishad Sohoni cah1003@cam.ac.uk University of Cambridge, Whittle... Laboratory 1 JJ Thomson Avenue, Cambridge CB3 0DY ABSTRACT A key challenge in open rotor design is getting the optimum aerodynamics at both the cruise and take-off conditions. This is particularly difficult because the operation and the requirements...

  20. Method and apparatus for reducing rotor blade deflections, loads, and/or peak rotational speed

    DOE Patents [OSTI]

    Moroz, Emilian Mieczyslaw; Pierce, Kirk Gee

    2006-10-17T23:59:59.000Z

    A method for reducing at least one of loads, deflections of rotor blades, or peak rotational speed of a wind turbine includes storing recent historical pitch related data, wind related data, or both. The stored recent historical data is analyzed to determine at least one of whether rapid pitching is occurring or whether wind speed decreases are occurring. A minimum pitch, a pitch rate limit, or both are imposed on pitch angle controls of the rotor blades conditioned upon results of the analysis.

  1. The effect of pipe diameter on orifice mixers

    E-Print Network [OSTI]

    Tomme, Warren James

    1959-01-01T23:59:59.000Z

    in kerosene, V is the total rate of flow in gallons per minute~ DO is the orifice diameter and A is the interfacial area in square centimeters per cubic centimeter of dispersion. This correlation indicated a linear relationship between the velocity... function of the change in kinetic energy across the orifice and the volume fraction of water in kerosene. Also considered was a correlation based on dimensional analysis. The first of these two correlations is as follows: il 1 661 (P)o. il4) (/ //0)0'V...

  2. A Case Study of Wide Diameter Casing for Geothermal Systems

    SciTech Connect (OSTI)

    King, T.R.; Freeston, D.H.; Winmill, R.L.

    1995-01-01T23:59:59.000Z

    Three wells have been drilled in the central resistivity area of a geothermal field in the Taupo Volcanic Zone, New Zealand. Using a well bore simulator, WELL SIM V3.0, reservoir conditions and well characteristics are evaluated to determine the increase in output by increasing production casing diameters from either 8-5/8 inches OD or 9-5/8 inches OD to 13-3/8 inches OD. Increases in well drilling costs are determined to provide a commentary on the economics. While open hole size is effectively doubled, well costs increase by 10% and, in this study, output increases by an average of 18%.

  3. Allowable pillar to diameter ratio for strategic petroleum reserve caverns.

    SciTech Connect (OSTI)

    Ehgartner, Brian L.; Park, Byoung Yoon

    2011-05-01T23:59:59.000Z

    This report compiles 3-D finite element analyses performed to evaluate the stability of Strategic Petroleum Reserve (SPR) caverns over multiple leach cycles. When oil is withdrawn from a cavern in salt using freshwater, the cavern enlarges. As a result, the pillar separating caverns in the SPR fields is reduced over time due to usage of the reserve. The enlarged cavern diameters and smaller pillars reduce underground stability. Advances in geomechanics modeling enable the allowable pillar to diameter ratio (P/D) to be defined. Prior to such modeling capabilities, the allowable P/D was established as 1.78 based on some very limited experience in other cavern fields. While appropriate for 1980, the ratio conservatively limits the allowable number of oil drawdowns and hence limits the overall utility and life of the SPR cavern field. Analyses from all four cavern fields are evaluated along with operating experience gained over the past 30 years to define a new P/D for the reserve. A new ratio of 1.0 is recommended. This ratio is applicable only to existing SPR caverns.

  4. Prediction of tree diameter growth using quantile regression and mixed-effects models

    E-Print Network [OSTI]

    Cao, Quang V.

    Prediction of tree diameter growth using quantile regression and mixed-effects models Som B. Bohora diameter predictions for the same tree in the future. Another approach considered in this study involved and mixed-effects models in predicting tree diameter growth. Tree diameter at the end of each growth period

  5. Control system for a wound-rotor motor

    DOE Patents [OSTI]

    Ellis, James N. (Chatsworth, CA)

    1983-01-01T23:59:59.000Z

    A load switching circuit for switching two or more transformer taps under load carrying conditions includes first and second parallel connected bridge rectifier circuits which control the selective connection of a direct current load to taps of a transformer. The first bridge circuit is normally conducting so that the load is connected to a first tap through the first bridge circuit. To transfer the load to the second tap, a switch is operable to connect the second bridge circuit to a second tap, and when the second bridge circuit begins to conduct, the first bridge circuit ceases conduction because the potential at the second tap is higher than the potential at the first tap, and the load is thus connected to the second tap through the second bridge circuit. The load switching circuit is applicable in a motor speed controller for a wound-rotor motor for effecting tap switching as a function of motor speed while providing a stepless motor speed control characteristic.

  6. Seismic fragility test of a 6-inch diameter pipe system

    SciTech Connect (OSTI)

    Chen, W. P.; Onesto, A. T.; DeVita, V.

    1987-02-01T23:59:59.000Z

    This report contains the test results and assessments of seismic fragility tests performed on a 6-inch diameter piping system. The test was funded by the US Nuclear Regulatory Commission (NRC) and conducted by ETEC. The objective of the test was to investigate the ability of a representative nuclear piping system to withstand high level dynamic seismic and other loadings. Levels of loadings achieved during seismic testing were 20 to 30 times larger than normal elastic design evaluations to ASME Level D limits would permit. Based on failure data obtained during seismic and other dynamic testing, it was concluded that nuclear piping systems are inherently able to withstand much larger dynamic seismic loadings than permitted by current design practice criteria or predicted by the probabilistic risk assessment (PRA) methods and several proposed nonlinear methods of failure analysis.

  7. Dynamic Rotor Deformation and Vibration Monitoring Using a Non-Incremental Laser Doppler Distance Sensor

    SciTech Connect (OSTI)

    Pfister, Thorsten; Guenther, Philipp; Dreier, Florian; Czarske, Juergen [Technische Universitaet Dresden, Faculty of Electrical Engineering and Information Technology, Laboratory for Measurement and Testing Techniques, Helmholtzstrasse 18, D-01062 Dresden (Germany)

    2010-05-28T23:59:59.000Z

    Monitoring rotor deformations and vibrations dynamically is an important task for improving the safety and the lifetime as well as the energy efficiency of motors and turbo machines. However, due to the high rotor speed encountered in particular at turbo machines, this requires concurrently a high measurement rate and high accuracy, which can not be fulfilled by most commercially available sensors. To solve this problem, we developed a non-incremental laser Doppler distance sensor (LDDS), which is able to measure simultaneously the in-plane velocity and the out-of-plane position of moving rough solid objects with micrometer precision. In addition, this sensor concurrently offers a high temporal resolution in the microsecond range, because its position uncertainty is in principle independent of the object velocity in contrast to conventional distance sensors, which is a unique feature of the LDDS. Consequently, this novel sensor enables precise and dynamic in-process deformation and vibration measurements on rotating objects, such as turbo machine rotors, even at very high speed. In order to evidence the capability of the LDDS, measurements of rotor deformations (radial expansion), vibrations and wobbling motions are presented at up to 50,000 rpm rotor speed.

  8. NON-STATIONARY TEMPERATURE STRESSES IN THE INDUSTRIAL STEAM TURBINE ROTOR

    E-Print Network [OSTI]

    Zvonimir Guzovi?; Krešimir Kova?i?; Tihomir Mihali?

    The usage of industrial steam turbines in different industrial branches (chemistry, petrochemistry, refineries, sugar and ethanol plants, etc.) for a generator drive for electricity generation or a mechanical drive for compressors, blowers and pumps, is characterized by the need for high flexibility of operation. High flexibility includes numerous start-ups, shut-downs and power changes during the useful life. Changes in power and steam mass flow lead to changes of the working fluid state in the single turbine stages, and thus their aerodynamic and thermodynamic characteristics. During these transient working regimes in steam turbine rotors, large space and time-dependent temperature gradients appear, which can result in high non-stationary temperature stresses, i.e. increased local stress concentrations, what has a negative impact on the useful life of the rotor. In the worst case they can cause fracture of the turbine rotor. Today, for the determination of thermal stressed state of the steam turbine parts the user softwares based on numerical methods are used. In this paper the results of numerical modelling and calculations of non-stationary temperature fields and related stresses in the rotor of industrial steam turbine of 35 MW power during transient operating regime (a cold startup) will be presented. The results of the calculations serve for estimation of the transient regime impact on the stresses of the rotor, as well as on its entire useful life. Key words: industrial steam turbine, transient regimes, temperature stresses, numerical modelling 1.

  9. Non-equilibrium steady state and subgeometric ergodicity for a chain of three coupled rotors

    E-Print Network [OSTI]

    Noé Cuneo; Jean-Pierre Eckmann; Christophe Poquet

    2014-11-03T23:59:59.000Z

    We consider a chain of three rotors (rotators) whose ends are coupled to stochastic heat baths. The temperatures of the two baths can be different, and we allow some constant torque to be applied at each end of the chain. Under some non-degeneracy condition on the interaction potentials, we show that the process admits a unique invariant probability measure, and that it is ergodic with a stretched exponential rate. The interesting issue is to estimate the rate at which the energy of the middle rotor decreases. As it is not directly connected to the heat baths, its energy can only be dissipated through the two outer rotors. But when the middle rotor spins very rapidly, it fails to interact effectively with its neighbors due to the rapid oscillations of the forces. By averaging techniques, we obtain an effective dynamics for the middle rotor, which then enables us to find a Lyapunov function. This and an irreducibility argument give the desired result. We finally illustrate numerically some properties of the non-equilibrium steady state.

  10. Transient analysis of a flywheel battery containment during a full rotor burst event.

    SciTech Connect (OSTI)

    Hsieh, B. J.

    1998-04-17T23:59:59.000Z

    Flywheels are being developed for use in an Advanced Locomotive Propulsion System (ALPS) targeted for use in high speed passenger rail service. The ALPS combines high performance, high speed gas turbines, motor/generators and flywheels to provide a light-weight, fuel-efficient power system. Such a system is necessary to avoid the high cost of railway electrification, as is currently done for high speed rail service (>100mph) since diesels are too heavy. The light-weight flywheel rotors are made from multilayered composite materials, and are operated at extremely high energy levels. Metal containment structures have been designed to enclose the rotors and provide encapsulation of the rotor during postulated failure events. One such event is a burst mode failure of the rotor in which the composite rim is assumed to burst into debris that impacts against the containment. This paper presents a finite element simulation of the transient structural response of a subscale metal flywheel containment structure to a rotor burst event.

  11. Method and apparatus for wind turbine air gap control

    DOE Patents [OSTI]

    Grant, James Jonathan; Bagepalli, Bharat Sampathkumaran; Jansen, Patrick Lee; DiMascio, Paul Stephen; Gadre, Aniruddha Dattatraya; Qu, Ronghai

    2007-02-20T23:59:59.000Z

    Methods and apparatus for assembling a wind turbine generator are provided. The wind turbine generator includes a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis, a rotor rotatable about the generator longitudinal axis wherein the rotor includes a plurality of magnetic elements coupled to a radially outer periphery of the rotor such that an airgap is defined between the stator windings and the magnetic elements and the plurality of magnetic elements including a radially inner periphery having a first diameter. The wind turbine generator also includes a bearing including a first member in rotatable engagement with a radially inner second member, the first member including a radially outer periphery, a diameter of the radially outer periphery of the first member being substantially equal to the first diameter, the rotor coupled to the stator through the bearing such that a substantially uniform airgap is maintained.

  12. THE JOURNAL OF CHEMICAL PHYSICS 135, 094304 (2011) "Adiabatic-hindered-rotor" treatment of the parahydrogen-water complex

    E-Print Network [OSTI]

    Le Roy, Robert J.

    THE JOURNAL OF CHEMICAL PHYSICS 135, 094304 (2011) "Adiabatic-hindered-rotor" treatment of the parahydrogen-water complex Tao Zeng,1 Hui Li,2 Robert J. Le Roy,1 and Pierre-Nicholas Roy1,a) 1 Department 1 September 2011) Inspired by a recent successful adiabatic-hindered-rotor treatment

  13. Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo Alto, California 94304 SW 41 Ti ROTOR

    E-Print Network [OSTI]

    Pawlowski, Wojtek

    Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo and understood before operation or maintenance of this equip- ment is attempted. When you see the symbol on other the performance of the rotor. This rotor was developed, manufactured, and tested for safety and reliability

  14. Scnarios d'interaction rotor/stator pour un compresseur haute pression d'un moteur d'hlicoptre

    E-Print Network [OSTI]

    Boyer, Edmond

    Scénarios d'interaction rotor/stator pour un compresseur haute pression d'un moteur d'hélicoptère A plus de prévoir les zones d'interaction. Rotor-stator interaction scenarios for the centrifugal in the centrifugal com- pressor of helicopter engines when structural contacts occur between the blade

  15. The development of an experimental procedure to determine the amount of active internal friction in a rotor-bearing system

    E-Print Network [OSTI]

    Parker, Jeffrey Scott

    1997-01-01T23:59:59.000Z

    . The logarithmic decrement as calculated by the time response is used to determine the active friction force. By affecting the vibrational mode shape (by the use of weights at each end), the free-free rotor can simulate the frictional characteristics of a rotor...

  16. The effect of adding axial freedom to the blades of a two bladed helicopter rotor

    E-Print Network [OSTI]

    Oradat, Frank Robert

    1953-01-01T23:59:59.000Z

    cire used on the rotor, the link nas all the blades attacned to it, and tne "teeter-totter" nin!;e rr&rst be excnanSe&! for a univ& rsal point, preferably of tne con: t-rrrt velocitv tyi e. Tne a?de&& blades snoula rrnve a stabilizin;, . irif i...THE Epr'ECT OZ ADDIRQ AX' AL RREEDO?l TO THE Bl ADRS QF A TWO BLADED HELICOPTER ROTOR A Thesis Frank Robert Oradat, Jr. Approveo as to style and content by: (Cnair. san of Co xttee) (liead of Dep tment) May I955 THE EPPECT OP ADDING AXIAL...

  17. Effect of a straight teeth-on-rotor labyrinth seal on rotordynamics

    E-Print Network [OSTI]

    Zierer, Joseph John

    1991-01-01T23:59:59.000Z

    functions were made with the rotor spinning at 4500 rpm with the pressure in the seal section ranging from 0 ? 175 psig, with 25 psi steps. The effects of the increased pressure are presented in the discussion of the results. There is one other point...EFFECT OF A STRAIGHT TEETH-ON-ROTOR LABYRINTH SEAL ON ROTORDYNAMICS A Thesis by JOSEPH JOHN ZIERER, JR. Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER...

  18. Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report

    SciTech Connect (OSTI)

    Corren, Dean [Verdant Power, Inc.; Colby, Jonathan [Verdant Power, Inc.; Adonizio, Mary Ann [Verdant Power, Inc.

    2013-01-29T23:59:59.000Z

    Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

  19. To cite this document: Barbiero, Franck and Vincent, Franois and Deloues, Thierry and Letestu, Franck Effects of rotor blade modulation on GNSS anti-jamming algorithms.

    E-Print Network [OSTI]

    Mailhes, Corinne

    , Franck Effects of rotor blade modulation on GNSS anti-jamming algorithms. (2014) In: ION International be sent to the repository administrator: staff-oatao@inp-toulouse.fr #12;Effects of rotor blade modulation rotating bodies, the signal undergo complex and non-stationary effects called Rotor Blade Modulation (RBM

  20. AUTOMATED WATER LEVEL MEASUREMENTS IN SMALL-DIAMETER AQUIFER TUBES

    SciTech Connect (OSTI)

    PETERSEN SW; EDRINGTON RS; MAHOOD RO; VANMIDDLESWORTH PE

    2011-01-14T23:59:59.000Z

    Groundwater contaminated with hexavalent chromium, strontium-90, and uranium discharges into the Columbia River along approximately 16 km (10 mi) of the shoreline. Various treatment systems have and will continue to be implemented to eliminate the impact of Hanford Site contamination to the river. To optimize the various remediation strategies, it is important to understand interactions between groundwater and the surface water of the Columbia River. An automated system to record water levels in aquifer sampling tubes installed in the hyporheic zone was designed and tested to (1) gain a more complete understanding of groundwater/river water interactions based on gaining and losing conditions ofthe Columbia River, (2) record and interpret data for consistent and defensible groundwater/surface water conceptual models that may be used to better predict subsurface contaminant fate and transport, and (3) evaluate the hydrodynamic influence of extraction wells in an expanded pump-and-treat system to optimize the treatment system. A system to measure water levels in small-diameter aquifer tubes was designed and tested in the laboratory and field. The system was configured to allow manual measurements to periodically calibrate the instrument and to permit aquifer tube sampling without removing the transducer tube. Manual measurements were collected with an e-tape designed and fabricated especially for this test. Results indicate that the transducer system accurately records groundwater levels in aquifer tubes. These data are being used to refine the conceptual and numeric models to better understand interactions in the hyporheic zone of the Columbia River and the adjacent river water and groundwater, and changes in hydrochemistry relative to groundwater flux as river water recharges the aquifer and then drains back out in response to changes in the river level.

  1. Geodesic diameter of sets defined by few quadratic equations and inequalities

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Geodesic diameter of sets defined by few quadratic equations and inequalities Michel Coste and Seydou Moussa September 2, 2010 Abstract We prove a bound for the geodesic diameter of a subset borrowed from D'Acunto and Kurdyka (to deal with the geodesic diameter) and from Barvinok (to take

  2. American Institute of Aeronautics and Astronautics Numerical Solutions for Ultra-Micro Wave Rotors (UWR)

    E-Print Network [OSTI]

    Müller, Norbert

    , 48824 Starting in 1995, with the MIT "Micro Gas Turbine" project, the mechanical engineering research to an ultra-micro gas turbine. It discusses the advantages of wave rotor as topping units for gas turbines. Introduction ltra Micro Gas Turbines (UµGT) are expected to be the next generation of power source for any

  3. Waves of constant shape and the structure of the \\rotors boundary" in excitable media.

    E-Print Network [OSTI]

    Biktashev, Vadim N.

    wave patterns in R 2 , in terms of the kinematic approach. These patterns include rotating waves by Winfree [13]. The kinematic approach of [8] also considered a boundary of existence of spiral waveWaves of constant shape and the structure of the \\rotors boundary" in excitable media. Yu.E. Elkin

  4. 2010 Asia-Pacific International Symposium on Aerospace Technology Rotor-stator interaction broadband noise

    E-Print Network [OSTI]

    Huang, Xun

    2010 Asia-Pacific International Symposium on Aerospace Technology Rotor-stator interaction-dimensional annular cascade to the impinging harmonic distortions. Each upstream har- monic mode is defined by its and Horan[2] . The #12;· 2 · Igor Vinogradov/ Chinese Journal of Aeronatics typical energy distribution over

  5. Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method Enric Roca Le´on Ph Aerodynamics Leader, Airbus Helicopter, Marignane, France Michel Costes Research Engineer, ONERA, Meudon OF THE AMERICAN HELICOPTER SOCIETY Abstract A multi-objective strategy adapted to the aerodynamic concurrent

  6. Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow

    E-Print Network [OSTI]

    Boyer, Edmond

    Numerical modeling of heat transfer and fluid flow in rotor-stator cavities with throughflow S the dynamical effects from the heat transfer process. The fluid flow in an enclosed disk system with axial with heat transfer along the stator, which corresponds to the experiment of Djaoui et al. [2]. Our results

  7. Performance of Rotors in a Brushless Doubly-Fed Induction Machine (BDFM)

    E-Print Network [OSTI]

    Cambridge, University of

    a novel design of BDFM rotor, will perform in a BDFM configured as a variable speed generator. The results The BDFM is attractive as a variable speed generator for wind turbines. In this application, one stator. The BDFM operates in synchronous mode with a fixed relationship between the shaft speed, grid frequency

  8. Toward a Better Understanding of Ducted Rotor Antitorque and Directional Control in Forward Flight

    E-Print Network [OSTI]

    of the Core Automatic Flight Control System (CAFCS) mode. Figure 1 shows a sustained, large-amplitude 1-Hz yaw ABSTRACT Despite decades of very successful yaw-control and anti-torque applications, the aerodynamics dramatic. From a handling-qualities perspective, the ducted rotor provides the loads capacity required

  9. MPC for Wind Power Gradients --Utilizing Forecasts, Rotor Inertia, and Central Energy Storage

    E-Print Network [OSTI]

    MPC for Wind Power Gradients -- Utilizing Forecasts, Rotor Inertia, and Central Energy Storage iterations. We demonstrate our method in simulations with various wind scenarios and prices for energy. INTRODUCTION Today, wind power is the most important renewable energy source. For the years to come, many

  10. Blade-forced vibration effects in turbomachinery rotor-stator interaction

    E-Print Network [OSTI]

    Collard, Joseph Eugene

    2000-01-01T23:59:59.000Z

    This thesis presents the effects of blade-forced vibration in turbomachinery rotor-stator interaction. A quasi-three-dimensional multi-row analysis, based on an Euler/Navier-Stokes solver and a parallel computational algorithm, was used to simulate...

  11. 3-D Time-Accurate CFD Simulations of Wind Turbine Rotor Flow Fields

    E-Print Network [OSTI]

    problems such as helicopter rotors and propellers. In particular, wind turbine blades can experience large from the tower support on downwind, horizontal axis wind turbines. These blade/inflow/tower wake in large scale wind turbines, because the blade passage frequency is well below the audible range

  12. Preliminary Design Procedure for Gas TurbineTopping Reverse-Flow Wave Rotors

    E-Print Network [OSTI]

    Müller, Norbert

    1 Preliminary Design Procedure for Gas TurbineTopping Reverse-Flow Wave Rotors Pezhman AKBARI1 for implementation in gas turbine applications. First, a thermodynamic cycle analysis evaluates the performance engine. Then, a one-dimensional analytical gas dynamic model of the high-pressure phase (charging zone

  13. Heat Transfer -1 Consider a composite pipe of inner diameter 10 cm and outer diameter 10.6 cm subjected to an external

    E-Print Network [OSTI]

    Virginia Tech

    Heat Transfer - 1 Consider a composite pipe of inner diameter 10 cm and outer diameter 10.6 cm subjected to an external constant uniform heat flux of 100,000 W/m2 . The composite material of the pipe has/mK in the axial direction. Both ends of the pipe are insulated from any heat loss. The pipe is cooled by water

  14. Improvement of Kalai-Kleitman bound for the diameter of a polyhedron

    E-Print Network [OSTI]

    2014-11-18T23:59:59.000Z

    Nov 18, 2014 ... believe that by refining the analysis of the Kalai-Kleitman inequality (1), a better bound for the diameter of the polyhedron could be obtained.

  15. Method and apparatus for determining diameter and wall thickness of minute hollow spherical shells

    DOE Patents [OSTI]

    Steinman, D.A.

    1980-05-30T23:59:59.000Z

    Method and apparatus for determining diameter and wall thickness of hollow microspheres or shells wherein terminal velocities of shells traveling in fluid-filled conduits of differing diameters are measured. A wall-effect factor is determined as a ratio of the terminal velocities, and shell outside diameter may then be ascertained as a predetermined empirical function of wall-effect factor. For shells of known outside diameter, wall thickness may then be ascertained as a predetermined empirical function of terminal velocity in either conduit.

  16. Risk assessment of turbine rotor failure using probabilistic ultrasonic non-destructive evaluations

    SciTech Connect (OSTI)

    Guan, Xuefei; Zhang, Jingdan; Zhou, S. Kevin [Siemens Corporation, Corporate Technology, 755 College Rd. E., Princeton NJ 08540 (United States); Rasselkorde, El Mahjoub; Abbasi, Waheed A. [Siemens Energy Inc., 841 Old Frankstown Road, Pittsburgh PA 15239 (United States)

    2014-02-18T23:59:59.000Z

    The study presents a method and application of risk assessment methodology for turbine rotor fatigue failure using probabilistic ultrasonic nondestructive evaluations. A rigorous probabilistic modeling for ultrasonic flaw sizing is developed by incorporating the model-assisted probability of detection, and the probability density function (PDF) of the actual flaw size is derived. Two general scenarios, namely the ultrasonic inspection with an identified flaw indication and the ultrasonic inspection without flaw indication, are considered in the derivation. To perform estimations for fatigue reliability and remaining useful life, uncertainties from ultrasonic flaw sizing and fatigue model parameters are systematically included and quantified. The model parameter PDF is estimated using Bayesian parameter estimation and actual fatigue testing data. The overall method is demonstrated using a realistic application of steam turbine rotor, and the risk analysis under given safety criteria is provided to support maintenance planning.

  17. Microwave-emitting rotor, separator apparatus including same, methods of operation and design thereof

    DOE Patents [OSTI]

    Meikrantz, David H.

    2006-12-19T23:59:59.000Z

    An apparatus for use in separating, at least in part, a mixture, including at least one chamber and at least one microwave generation device configured for communicating microwave energy into the at least one chamber is disclosed. The rotor assembly may comprise an electric generator for generating electricity for operating the microwave generation device. At least one microwave generation device may be positioned within a tubular interior shaft extending within the rotor assembly. At least a portion of the tubular interior shaft may be substantially transparent to microwave energy. Microwave energy may be emitted in an outward radial direction or toward an anticipated boundary surface defined between a mixture and a separated constituent thereof. A method including flowing a mixture through at least one chamber and communicating microwave energy into the at least one chamber while rotating same is disclosed. Methods of operating a centrifugal separator and design thereof are disclosed.

  18. Effect of Cooling Flow on the Operation of a Hot Rotor-Gas Foil Bearing System

    E-Print Network [OSTI]

    Ryu, Keun

    2012-02-14T23:59:59.000Z

    .2 Drive end GFB: Predicted bearing static parameters ................................. 157 M.3 Free end GFB: Predicted bearing static parameters ................................... 158 1 CHAPTER I INTRODUCTION Micro gas turbine engines (<400... kW) are light-weight compact units operating at extreme temperatures and at high rotor speeds to achieve the desired power with reduced emissions [1]. Employing gas foil bearings (GFBs) in micro gas turbines increases system efficiency...

  19. A new 2D FEM analysis of a disc machine with offset rotor

    SciTech Connect (OSTI)

    Gair, S.; Canova, A. [Napier Univ., Edinburgh (United Kingdom). Dept. of Electrical, Electronic and Computer Engineering; Eastham, J.F.; Betzer, T. [Univ. of Bath (United Kingdom). School of Electronic and Electrical Engineering

    1995-12-31T23:59:59.000Z

    The paper presents a new 2-Dimensional Finite Element Method (2D FEM) analysis of a double sided axial field, permanent magnet excited brushless DC motor. The rotor of the machine is free to move in a direction perpendicular to the axis of the shaft. Computed 2D results are compared with 3D FEM analysis and the new analysis method is shown to give close agreement.

  20. Rotor dynamic analysis of multi-line systems using the polynomial transfer matrix method

    E-Print Network [OSTI]

    Troxler, Paul Joseph

    1990-01-01T23:59:59.000Z

    forces generated by the working fluid of the machine; squeeze film, elastomeric or active feedback dampers; or machine mounting and attachment flexibility. Of course the results of the analysis are only good if the linearization is a valid approximation...ROTOR DYNAMIC ANALYSIS OF MULTI-LINE SYSTEMS USING THE POLYNOMIAL TRANSFER MATRIX METHOD A Thesis by PAUL JOSEPH TROXLER Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirement...

  1. Vertically aligned crystalline silicon nanowires with controlled diameters for energy conversion applications: Experimental and theoretical insights

    SciTech Connect (OSTI)

    Razek, Sara Abdel; Swillam, Mohamed A.; Allam, Nageh K., E-mail: nageh.allam@aucegypt.edu [Department of Physics, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835 (Egypt)

    2014-05-21T23:59:59.000Z

    Vertically orientated single crystalline silicon nanowire (SiNW) arrays with controlled diameters are fabricated via a metal-assisted chemical etching method. The diameter of the fabricated nanowires is controlled by simply varying the etching time in HF/H{sub 2}O{sub 2} electrolytes. The fabricated SiNWs have diameters ranging from 117 to 650?nm and lengths from 8 to 18??m. The optical measurements showed a significant difference in the reflectance/absorption of the SiNWs with different diameters, where the reflectance increases with increasing the diameter of the SiNWs. The SiNWs showed significant photoluminescence (PL) emission spectra with peaks lying between 380 and 670?nm. The PL intensity increases as the diameter increases and shows red shift for peaks at ?670?nm. The increase or decrease of reflectivity is coincident with PL intensity at wavelength ?660?nm. The x-ray diffraction patterns confirm the high crystallinity of the fabricated SiNWs. In addition, the Raman spectra showed a shift in the first order transverse band toward lower frequencies compared to that usually seen for c-Si. Finite difference time domain simulations have been performed to confirm the effect of change of diameter on the optical properties of the nanowires. The simulation results showed good agreement with the experimental results for the SiNWs of different diameters.

  2. Instability of condensate lm and capillary blocking in small-diameter-thermosyphon condensers

    E-Print Network [OSTI]

    Zhao, Tianshou

    Instability of condensate ®lm and capillary blocking in small-diameter-thermosyphon condensers H 1998 Abstract Instability of the condensate ®lm in a small-diameter-tube condenser was investigated- namic force or surface tension, the inner surface of the annular condensate ®lm is inherently unstable

  3. European Projects of Solar Diameter Monitoring Costantino Sigismondi, Michele Bianda and Jean Arnaud

    E-Print Network [OSTI]

    European Projects of Solar Diameter Monitoring Costantino Sigismondi¹, Michele Bianda² and Jean Abstract. Three projects dealing with solar diameter evolution are presently in development. Historical will be monitored with fast CMOS sensors in different wavebands. The will run at IRSOL Gregory-Coudé telescope

  4. Ordered Arrays of Dual-Diameter Nanopillars for Maximized Optical Absorption

    E-Print Network [OSTI]

    Javey, Ali

    Ordered Arrays of Dual-Diameter Nanopillars for Maximized Optical Absorption Zhiyong Fan,,,§ Rehan control to achieve the optimal absorption efficiency. Increasing the Ge materials filling ratio is shown a strong diameter dependency. To enhance the broad band optical absorption efficiency, a novel dual

  5. NT13 Satellites Saturday MSIN13 Posters Precursor-dependent reversible diameter modulation of

    E-Print Network [OSTI]

    Maruyama, Shigeo

    by chemical vapor deposition (CVD) of an acetonitrile-ethanol mixture [1]. The addition of no morethanfivevolumepercentacetonitrileinethanolresultsinadramaticreductionofthemeanSWNTdiameter. In the absence of acetonitrile, the mean diameter returns to the ~2 nm typical by the addition or absence of acetonitrile in the feedstock, and this diameter change is both reversible

  6. Growth and field emission properties of small diameter carbon nanotube films

    E-Print Network [OSTI]

    Qin, Lu-Chang

    Growth and field emission properties of small diameter carbon nanotube films Y.Y. Wanga,*, S of the emission site intensity. D 2004 Elsevier B.V. All rights reserved. Keywords: Small diameter carbon nanotubes; MWCVD; Growth; Field emission 1. Introduction Single- or double-wall carbon nanotubes (CNT

  7. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P.

    1995-11-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy we analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. in extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  8. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P. [National Renewable Energy Lab., Golden, CO (United States). Wind Technology Div.

    1996-10-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable-speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable-speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy analyzed uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. In extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  9. Variable speed operation of generators with rotor-speed feedback in wind power applications

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C.P.; Migliore, P. [National Renewable Energy Lab., Golden, CO (United States)

    1996-11-01T23:59:59.000Z

    The use of induction generators in wind power applications has been common since the early development of the wind industry. Most of these generators operate at fixed frequency and are connected directly to the utility grid. Unfortunately, this mode of operation limits the rotor speed to a specific rpm. Variable speed operation is preferred in order to facilitate maximum energy capture over a wide range of wind speeds. This paper explores variable speed operating strategies for wind turbine applications. The objectives are to maximize energy production, provide controlled start-up, and reduce torque loading. This paper focuses on optimizing the energy captured by operating at maximum aerodynamic efficiency at any wind speed. The control strategy the authors analyze uses rotor speed and generator power as the feedback signals. In the normal operating region, rotor speed is used to compute a target power that corresponds to optimum operation. With power as the control objective, the power converter and generator are controlled to track the target power at any rpm. Thus, the torque-speed characteristic of the generator is shaped to optimize the energy capture. The target power is continuously updated at any rpm. In extreme areas of the operating envelope, during start-up, shutdown, generator overload, or overspeed, different strategies driven by other system considerations must be used.

  10. Application of SAFER-PC program to determine turbine rotor boresonic inspection intervals

    SciTech Connect (OSTI)

    Sachse, D.G.; Hellner, R.L.; Dupont, E.J. [Public Service Co., Denver, CO (United States)

    1996-12-31T23:59:59.000Z

    Public Service Company of Colorado (PSCC) used EPRI`s SAFER-PC Program to evaluate their HP/IP, LP, and generator rotors from Cherokee Station Unit 3, to determine appropriate boresonic re-inspection intervals. The program uses fracture mechanics to calculate critical crack sizes, which could lead to catastrophic failure of the rotors. Conservative stress and fracture mechanics analyses showed negligible fatigue crack growth of assumed bore surface cracks would occur over the proposed inspection interval of eighteen years. The evaluation assumed consistent operational start-up procedures for the inspection interval. If the unit experiences more severe operational procedures, the analysis may not be applicable, with smaller critical crack sizes and accelerated crack growth rates expected. The SAFER-PC analysis resulted in an extension of the previously recommended reinspection interval by eight years. By eliminating just this one inspection, PSCC achieved savings in the range of $100,000. Further savings are anticipated by utilizing the SAFER-PC Program to evaluate these and other PSCC rotors in the future.

  11. Can quantum fractal fluctuations be observed in an atom-optics kicked rotor experiment?

    E-Print Network [OSTI]

    Andrea Tomadin; Riccardo Mannella; Sandro Wimberger

    2005-12-01T23:59:59.000Z

    We investigate the parametric fluctuations in the quantum survival probability of an open version of the delta-kicked rotor model in the deep quantum regime. Spectral arguments [Guarneri I and Terraneo M 2001 Phys. Rev. E vol. 65 015203(R)] predict the existence of parametric fractal fluctuations owing to the strong dynamical localisation of the eigenstates of the kicked rotor. We discuss the possibility of observing such dynamically-induced fractality in the quantum survival probability as a function of the kicking period for the atom-optics realisation of the kicked rotor. The influence of the atoms' initial momentum distribution is studied as well as the dependence of the expected fractal dimension on finite-size effects of the experiment, such as finite detection windows and short measurement times. Our results show that clear signatures of fractality could be observed in experiments with cold atoms subjected to periodically flashed optical lattices, which offer an excellent control on interaction times and the initial atomic ensemble.

  12. Impact of access port diameter on the long reach manipulator design

    SciTech Connect (OSTI)

    Stoughton, R.S.

    1994-04-01T23:59:59.000Z

    Many of the single shell storage tanks (SSTs) on the Hanford site appear to have central 42-in. risers which could be used as access ports for the Long Reach Manipulator (LRM). However, about half of the tanks are known to not have a central 42-in. riser and it has recently been discovered that of the tanks whose drawings indicate central 42-in. risers, the majority have been plugged, sealed, or taper down to a much smaller diameter at ground level. Thus, it can be assumed that a central access port for the LRM will have to be made. There are many issues involved in determining the best diameter for this access port such as radiation exposure, contamination prevention, and availability of remote excavation technology. This report analyzes the relationship between the access port diameter and the performance characteristics of the LRM. Previous work has assumed that the mast diameter would be 80% of the access port diameter. In this report, the maximum mast diameter will be varied rather than the access port diameter, leaving the issue of the required clearance between the mast and the access port open.

  13. Flooding Experiments with Steam and Water in a Large Diameter Vertical Tube

    E-Print Network [OSTI]

    Williams, Susan Nicole

    2010-10-12T23:59:59.000Z

    An experimental study on flooding with steam and water in a large diameter vertical tube was conducted. This research has been performed to provide a better prediction of flooding in a pressurized water reactor (PWR) pressurizer surge line...

  14. Evaluation of Methods to Predict Weibull Parameters for Characterizing Diameter Distributions

    E-Print Network [OSTI]

    Cao, Quang V.

    and Bennett (1965) applied the beta distribu- tion to describe diameter distributions on data from old yield models for slash pine (Bennett and Clutter 1968, Bennett et al. 1978), loblolly pine (Lenhart

  15. Example 1. An ice cream cone has diameter 2 in and is made to ...

    E-Print Network [OSTI]

    2011-09-13T23:59:59.000Z

    An ice cream cone has diameter 2 in and is made to hold 8 in3 when filled completely with ice cream so that it has a hemi-spherical top. Find the height of the ...

  16. Rotor Design for High Pressure Magic Angle Spinning Nuclear Magnetic Resonance

    SciTech Connect (OSTI)

    Turcu, Romulus V.F.; Hoyt, David W.; Rosso, Kevin M.; Sears, Jesse A.; Loring, John S.; Felmy, Andrew R.; Hu, Jian Z.

    2013-01-01T23:59:59.000Z

    High pressure magic angle spinning (MAS) nuclear magnetic resonance (NMR) with a sample spinning rate exceeding 2.1 kHz and pressure greater than 165 bar has never been realized. In this work, a new sample cell design is reported, suitable for constructing cells of different sizes. Using a 7.5 mm high pressure MAS rotor as an example, internal pressure as high as 200 bar at a sample spinning rate of 6 kHz is achieved. The new high pressure MAS rotor is re-usable and compatible with most commercial NMR set-ups, exhibiting low 1H and 13C NMR background and offering maximal NMR sensitivity. As an example of its many possible applications, this new capability is applied to determine reaction products associated with the carbonation reaction of a natural mineral, antigorite ((Mg,Fe2+)3Si2O5(OH)4), in contact with liquid water in water-saturated supercritical CO2 (scCO2) at 150 bar and 50 deg C. This mineral is relevant to the deep geologic disposal of CO2, but its iron content results in too many sample spinning sidebands at low spinning rate. Hence, this chemical system is a good case study to demonstrate the utility of the higher sample spinning rates that can be achieved by our new rotor design. We expect this new capability will be useful for exploring solid-state, including interfacial, chemistry at new levels of high-pressure in a wide variety of fields.

  17. Independent modal space control and modal filters for active vibration control of rotors

    E-Print Network [OSTI]

    Roever, Douglas Michael

    2012-06-07T23:59:59.000Z

    , as shown in equation (3. 7): ((t) = At(t) + Z(t) (3. 7) where Z is the modal force vector, and is given by: Z(t) = V BQ(t) = Vr M 'Q(t) (3 g) in which the right hand side of the equation results from the fact that only the lower n rows of the B matrix... gg Alan B. Pal o (Chair of Committee) James S. Noel (Member) Richard . Alexander (Member) Walter L. B ley (Head of Department) August 1992 ABSTRACT Independent Modal Space Control and Modal Filters for Active Vibration Control of Rotors...

  18. Notes 05. Dynamics of a simple rotor-fluid film bearing system

    E-Print Network [OSTI]

    San Andres, Luis

    2009-01-01T23:59:59.000Z

    geometry RPM_max 10000:= MAXIMUM & design speeds Nmax 50:= # of cases for analysis RPM design 7200:= a 0.2 c?:= Amplitude of imbalance on rotor disk Mechanical energy convected by lubricant. ? 0.8:= Thermal model conditions Heat carry over - thermal mixing... coefficient. ? 0.70:= T supply 50K:= Supply Oil Temperature Take deg-K as deg-C Lubricant properties PROPERTIES OF LUBRICANT MOBIL velocite No 10 (ISO VG 22) ? supply 0.0143 Ns? m 2 ?:= Lubricant viscosity at Tsupply in Pa-sec. ? 0.028 1 K ?:= Alpha...

  19. An experimental investigation of a tilt rotor aircraft wake in ground effect

    E-Print Network [OSTI]

    Frey, Michael Louis

    1982-01-01T23:59:59.000Z

    : Sktlld dS t' 1, "~Et 18, 6 (1975), pp. 51-673. Hunt, J. C. R. , Poulton, E. C. , and Mumford, J. C. , "The Effects of Wldppl:Sd't*l Bd tldt lt*p*' t, "~Bi1di Environment, 11 (1976), pp. 15-28. 50 VITA gichael Louis Frey III was born January 4, 1957...EXPERIMENTAL INVESTIGATION OF A TILT ROTOR AIRCRAFT WAKE IN GROUND EFFECT A Thesis by MICHAEL LOUIS FREY III Submi. tted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER...

  20. Characterizing Inflow Conditions Across the Rotor Disk of a Utility-Scale Wind Turbine (Poster)

    SciTech Connect (OSTI)

    Clifton, A.; Lundquist, J. K.; Kelley, N.; Scott, G.; Jager, D.; Schreck, S.

    2012-01-01T23:59:59.000Z

    Multi-megawatt utility-scale wind turbines operate in a turbulent, thermally-driven atmosphere where wind speed and air temperature vary with height. Turbines convert the wind's momentum into electrical power, and so changes in the atmosphere across the rotor disk influence the power produced by the turbine. To characterize the inflow into utility scale turbines at the National Wind Technology Center (NWTC) near Boulder, Colorado, NREL recently built two 135-meter inflow monitoring towers. This poster introduces the towers and the measurements that are made, showing some of the data obtained in the first few months of operation in 2011.

  1. Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo Alto, California 94304 SW 28.1 ROTORS

    E-Print Network [OSTI]

    Pawlowski, Wojtek

    Published by the Centrifuge Instrument Systems Development Center of Beckman Coulter, Inc., Palo and understood before operation or maintenance of this equip- ment is attempted. When you see the symbol on other the performance of the rotors. These rotors were developed, manufactured, and tested for safety and reliability

  2. Abstract--This paper proposes a methodology to decide the optimal matching between the size of the rotor of a wind turbine

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the rotor of a wind turbine and the rated power of a permanent magnet synchronous machine. This is made of the wind turbine, the gearbox's transformation ratio, the battery voltage and the wind speed probability's rated power and the wind turbine's rotor size. The system studied in this paper consists of 220 (V)/50

  3. A model for prediction of the damage and effects of explosive projectiles on helicopter composite material rotor blades

    E-Print Network [OSTI]

    Mikel, Tilden Newton

    1982-01-01T23:59:59.000Z

    . The dame, ge is based on a 23-mm HEI-T projectile impacting a fiberglass rotor blade spar. The extent of damage is developed as a function of impact velocity, obliquity of the shotline, location of the impact point, and the time of fuse functioning... Projectiles on Helicopter Composite Material Rotor Blades. (December 1982) Tilden Newton Nikel, B. S. , Texas AAM University; N . S . , Texas A&N University Chairman of Advisory Committee: Dr. Clarence L. Hough Jr. A number of damage models have been...

  4. Mass Transfer Testing of a 12.5-cm Rotor Centrifugal Contactor

    SciTech Connect (OSTI)

    D. H. Meikrantz; T. G. Garn; J. D. Law; N. R. Mann; T. A. Todd

    2008-09-01T23:59:59.000Z

    TRUEX mass transfer tests were performed using a single stage commercially available 12.5 cm centrifugal contactor and stable cerium (Ce) and europium (Eu). Test conditions included throughputs ranging from 2.5 to 15 Lpm and rotor speeds of 1750 and 2250 rpm. Ce and Eu extraction forward distribution coefficients ranged from 13 to 19. The first and second stage strip back distributions were 0.5 to 1.4 and .002 to .004, respectively, throughout the dynamic test conditions studied. Visual carryover of aqueous entrainment in all organic phase samples was estimated at < 0.1 % and organic carryover into all aqueous phase samples was about ten times less. Mass transfer efficiencies of = 98 % for both Ce and Eu in the extraction section were obtained over the entire range of test conditions. The first strip stage mass transfer efficiencies ranged from 75 to 93% trending higher with increasing throughput. Second stage mass transfer was greater than 99% in all cases. Increasing the rotor speed from 1750 to 2250 rpm had no significant effect on efficiency for all throughputs tested.

  5. Measured and predicted rotor performance for the SERI advanced wind turbine blades

    SciTech Connect (OSTI)

    Tangler, J.; Smith, B.; Kelley, N.; Jager, D.

    1992-02-01T23:59:59.000Z

    Measured and predicted rotor performance for the SERI advanced wind turbine blades were compared to assess the accuracy of predictions and to identify the sources of error affecting both predictions and measurements. An awareness of these sources of error contributes to improved prediction and measurement methods that will ultimately benefit future rotor design efforts. Propeller/vane anemometers were found to underestimate the wind speed in turbulent environments such as the San Gorgonio Pass wind farm area. Using sonic or cup anemometers, good agreement was achieved between predicted and measured power output for wind speeds up to 8 m/sec. At higher wind speeds an optimistic predicted power output and the occurrence of peak power at wind speeds lower than measurements resulted from the omission of turbulence and yaw error. In addition, accurate two-dimensional (2-D) airfoil data prior to stall and a post stall airfoil data synthesization method that reflects three-dimensional (3-D) effects were found to be essential for accurate performance prediction. 11 refs.

  6. User's Guide for the NREL Teetering Rotor Analysis Program (STRAP). [National Renewable Energy Laboratory (NREL)

    SciTech Connect (OSTI)

    Wright, A.D.

    1992-08-01T23:59:59.000Z

    The following report gives the reader an overview of instructions on the proper use of the National Renewable Energy Laboratory (formerly the Solar Energy Research Institute, or SERI) teetering Rotor Analysis Program (STRAP version 2.20). STRAP is a derivative of the Force and Loads Analysis program (FLAP). It is intended as a tool for prediction of rotor and blade loads and response for only two-bladed teetering hub wind turbines. The effects of delta-3, undersling, hub mass, and wind turbulence are accounted for. The objectives of the report are to give an overview of the code and also show the methods of data input and correct code execution steps in order to model an example two-bladed teetering hub turbine. A large portion of the discussion (Sections 6.0, 7.0, and 8.0) is devoted to the subject of inputting and running the code for wind turbulence effects. The ability to include turbulent wind effects is perhaps the biggest change in the code since the release of FLAP version 2.01 in 1988. This report is intended to be a user's guide. It does not contain a theoretical discussion on equations of motion, assumptions, underlying theory, etc. It is intended to be used in conjunction with Wright, Buhl, and Thresher (1988).

  7. User`s Guide for the NREL Teetering Rotor Analysis Program (STRAP)

    SciTech Connect (OSTI)

    Wright, A.D.

    1992-08-01T23:59:59.000Z

    The following report gives the reader an overview of instructions on the proper use of the National Renewable Energy Laboratory (formerly the Solar Energy Research Institute, or SERI) teetering Rotor Analysis Program (STRAP version 2.20). STRAP is a derivative of the Force and Loads Analysis program (FLAP). It is intended as a tool for prediction of rotor and blade loads and response for only two-bladed teetering hub wind turbines. The effects of delta-3, undersling, hub mass, and wind turbulence are accounted for. The objectives of the report are to give an overview of the code and also show the methods of data input and correct code execution steps in order to model an example two-bladed teetering hub turbine. A large portion of the discussion (Sections 6.0, 7.0, and 8.0) is devoted to the subject of inputting and running the code for wind turbulence effects. The ability to include turbulent wind effects is perhaps the biggest change in the code since the release of FLAP version 2.01 in 1988. This report is intended to be a user`s guide. It does not contain a theoretical discussion on equations of motion, assumptions, underlying theory, etc. It is intended to be used in conjunction with Wright, Buhl, and Thresher (1988).

  8. Large Diameter Limbs for Dilated Common Iliac Arteries in Endovascular Aneurysm Repair. Is It Safe?

    SciTech Connect (OSTI)

    Malagari, Katerina, E-mail: kmalag@aias.gr; Brountzos, Elias; Gougoulakis, Alexandros; Papathanasiou, Matilda; Alexopoulou, Efthymia; Mastorakou, Renata; Kelekis, Dimitris [University of Athens, 2nd Department of Radiology (Greece)

    2004-09-15T23:59:59.000Z

    In this prospective study we examined whether dilated common iliac arteries (CIAs) can provide a safe distal seal in endovascular aneurysm repair (EVAR) with the use of bifurcated stent grafts with large diameter limbs. Sixteen patients with 26 dilated CIAs with a diameter of {>=}6 mm who were offered EVAR using stent grafts with large diameter limbs were included in the study (Group A). Forty-two patients who also underwent EVAR without iliac dilatation, matched for age, sex and surgical risk were used for comparison (controls-Group B). In group A mean CIA diameter was 18.2 mm (16-28) and mean abdominal aortic aneurysm (AAA) diameter was 6.87 {+-} 1.05 cm; mean age was 77.2 {+-} 4.8 yrs (67-81). Mean follow-up was 33.6 months (2.8 yrs). CIA diameter changes and development of endoleaks were assessed by CT angiography (CTA). Overall iliac dilatation was present in 16/58 of our patients (27.6%). In 10 patients dilatation was bilateral (17.3%). Partial or complete flow to the internal iliac artery (IIA) territories was preserved in all patients post-EVAR. On follow-up, stable caliber of the dilated CIAs was observed in 21 patients (84%), enlargement of 1mm in 3 (16%), and failure of the distal attachment in 1 (6.2%). Compared to the control group there was no statistical significance in the incidence of complications. Dilated common iliac arteries provide a safe distal seal in patients who have undergone EVAR, thus obviating the need for additional endovascular procedures and sparing flow in the IIA vascular bed.

  9. Subcooling Effects for Flooding Experiments with Steam and Water in a Large Diameter Vertical Tube

    E-Print Network [OSTI]

    Cullum, Wes

    2012-10-19T23:59:59.000Z

    of these experiments can be disregarded as they do not pertain to the direct concentration of this experiment. However, some important past work in uential to this endeavor will be examined to provide the essential framework. This previous work does not nec... and Lobo plotted with the Wallis correlation [5]. Kg = g 1 2 jg [g ( f g)] 1 4 (2.4) Kf = f 1 2 jf [g ( f g)] 1 4 (2.5) 8 Pushinka and Sorokin observed that for the large diameter tubes used in the experiment, the tube diameter does...

  10. An "adiabatic-hindered-rotor" treatment allows para-H2 to be treated as if it were spherical

    E-Print Network [OSTI]

    Le Roy, Robert J.

    An "adiabatic-hindered-rotor" treatment allows para-H2 to be treated as if it were spherical Hui Li­ molecule interactions, the common assumption that para-H2 may be treated as a spherical particle is often K , it is often considered a good approximation to treat para-H2 as a spherical particle.1

  11. Wind turbine rotor blade with in-plane sweep and devices using same, and methods for making same

    DOE Patents [OSTI]

    Wetzel, Kyle Kristopher (Lawrence, KS)

    2008-03-18T23:59:59.000Z

    A wind turbine includes a rotor having a hub and at least one blade having a torsionally rigid root, an inboard section, and an outboard section. The inboard section has a forward sweep relative to an elastic axis of the blade and the outboard section has an aft sweep.

  12. Wind turbine rotor blade with in-plane sweep and devices using the same, and methods for making the same

    DOE Patents [OSTI]

    Wetzel, Kyle Kristopher

    2014-06-24T23:59:59.000Z

    A wind turbine includes a rotor having a hub and at least one blade having a torsionally rigid root, an inboard section, and an outboard section. The inboard section has a forward sweep relative to an elastic axis of the blade and the outboard section has an aft sweep.

  13. Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge materials from uncertain experimental data

    E-Print Network [OSTI]

    Granada, Universidad de

    Eliciting a human understandable model of ice adhesion strength for rotor blade leading edge: Genetic Fuzzy Systems Fuzzy rule-based classifiers Vague data Isotropic materials Ice-phobic materials Shear adhesion strength a b s t r a c t The published ice adhesion performance data of novel ``ice

  14. Production of vertical arrays of small diameter single-walled carbon nanotubes

    DOE Patents [OSTI]

    Hauge, Robert H; Xu, Ya-Qiong

    2013-08-13T23:59:59.000Z

    A hot filament chemical vapor deposition method has been developed to grow at least one vertical single-walled carbon nanotube (SWNT). In general, various embodiments of the present invention disclose novel processes for growing and/or producing enhanced nanotube carpets with decreased diameters as compared to the prior art.

  15. Carbon nanotube diameter selection by pretreatment of metal catalysts on surfaces

    DOE Patents [OSTI]

    Hauge, Robert H. (Houston, TX); Xu, Ya-Qiong (Houston, TX); Shan, Hongwei (Houston, TX); Nicholas, Nolan Walker (South Charleston, WV); Kim, Myung Jong (Houston, TX); Schmidt, Howard K. (Cypress, TX); Kittrell, W. Carter (Houston, TX)

    2012-02-28T23:59:59.000Z

    A new and useful nanotube growth substrate conditioning processes is herein disclosed that allows the growth of vertical arrays of carbon nanotubes where the average diameter of the nanotubes can be selected and/or controlled as compared to the prior art.

  16. The Variability of LateType Stars' Diameters Measured Using MidInfrared Interferometry

    E-Print Network [OSTI]

    California at Berkeley, University of

    in temperature within the star are exaggerated in the visible and a non­uniform intensity distribution to the diameter of a main­sequence star like the sun. The sun is observed to be a bright circular disk with a well several hundred times that of the sun, with comparable masses in some cases. As a consequence

  17. Measuring the Solar Diameter with a Michelson Radio Interferometer 1. Scientific Background

    E-Print Network [OSTI]

    Metchev, Stanimir

    3, M4, mirrors; a, 100-inch paraboloidal primary mirror; b convex secondary mirror; c, coud´e flatMeasuring the Solar Diameter with a Michelson Radio Interferometer 1. Scientific Background pick-off mirror; d, focus. Figures from Michelson & Pease (1921). A work-around the diffraction

  18. THE DIAMETER OF THE ISOMORPHISM CLASS OF A BANACH W. B. JOHNSON AND E. ODELL

    E-Print Network [OSTI]

    Johnson, William B.

    THE DIAMETER OF THE ISOMORPHISM CLASS OF A BANACH SPACE W. B. JOHNSON AND E. ODELL August 20, 2004 is finitely complementably universal; that is, there is Johnson was supported in part by NSF DMS­0200690 and Probability at Texas A&M University. MR subject classification: 46G05, 46T20. 1 #12; 2 W. B. JOHNSON AND E

  19. Phenomenological modeling of tumor diameter growth based on a mixed effects

    E-Print Network [OSTI]

    Boyer, Edmond

    Phenomenological modeling of tumor diameter growth based on a mixed effects model T. Bastogne a,, A tumor volume-based models have been devel- oped for the phenomenological modeling of tumor growth-00390380,version1-2Jun2009 #12;1 Introduction In systems theory1,2 , phenomenological or black-box models

  20. Reversible diameter modulation of single-walled carbon nanotubes by acetonitrile-containing

    E-Print Network [OSTI]

    Maruyama, Shigeo

    Reversible diameter modulation of single-walled carbon nanotubes by acetonitrile)3 5800 6983 Abstract Changing the carbon feedstock from pure ethanol to a 5 vol.% mixture of acetonitrile for a feedstock containing 5 volume percent (5 vol.%) acetonitrile in ethanol.18­20 This change was observed

  1. Diameter controlled CVD growth of nitrogen-incorporated single-walled carbon nanotubes

    E-Print Network [OSTI]

    Maruyama, Shigeo

    acetonitrile (AcN)- mixed ethanol (EtOH) feedstock, the SWNT mean diameter was dramatically reduced as Ac was reversible upon the sequence of feedstock introduction. By using 15N isotope of acetonitrile, the catalytic decomposition of acetonitrile in the initial reaction step was studied [5]. The initial decomposition process

  2. Single-Walled Carbon Nanotubes of Controlled Diameter and Bundle Size and Their Field Emission Properties

    E-Print Network [OSTI]

    Resasco, Daniel

    Single-Walled Carbon Nanotubes of Controlled Diameter and Bundle Size and Their Field Emission: June 8, 2005 Field emission studies were conducted on as-produced CoMoCAT single-walled carbon nanotube electron emitter. By adjusting the catalytic synthesis conditions, single-walled carbon nanotubes (SWNT

  3. Quantum and Classical Superballistic Transport in a Relativistic Kicked-Rotor System

    E-Print Network [OSTI]

    Qifang Zhao; Cord A. Muller; Jiangbin Gong

    2014-05-27T23:59:59.000Z

    As an unusual type of anomalous diffusion behavior, superballistic transport is not well known but has been experimentally simulated recently. Quantum superballistic transport models to date are mainly based on connected sublattices which are constructed to have different properties. In this work, we show that both quantum and classical superballistic transport in the momentum space can occur in a simple periodically driven Hamiltonian system, namely, a relativistic kicked-rotor system with a nonzero mass term. The nonzero mass term essentially realizes a junction-like scenario: regimes with low or high momentum values have different dispersion relations and hence different transport properties. It is further shown that the quantum and classical superballistic transport should occur under much different choices of the system parameters. The results are of interest to studies of anomalous transport, quantum and classical chaos, and the issue of quantum-classical correspondence.

  4. Indirect rotor position sensing in real time for brushless permanent magnet motor drives

    SciTech Connect (OSTI)

    Ertugrul, N. [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering] [Univ. of Adelaide (Australia). Dept. of Electrical and Electronic Engineering; Acarnley, P.P. [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering] [Univ. of Newcastle upon Tyne (United Kingdom). Dept. of Electrical and Electronic Engineering

    1998-07-01T23:59:59.000Z

    This paper describes a modern solution to real-time rotor position estimation of brushless permanent magnet (PM) motor drives. The position estimation scheme, based on flux linkage and line-current estimation, is implemented in real time by using the abc reference frame, and it is tested dynamically. The position estimation model of the test motor, development of hardware, and basic operation of the digital signal processor (DSP) are discussed. The overall position estimation strategy is accomplished with a fast DSP (TMS320C30). The method is a shaft position sensorless method that is applicable to a wide range of excitation types in brushless PM motors without any restriction on the motor model and the current excitation. Both rectangular and sinewave-excited brushless PM motor drives are examined, and the results are given to demonstrate the effectiveness of the method with dynamic loads in closed estimated position loop.

  5. Results from dynamic tests and analyses of a medium diameter LMFBR piping system

    SciTech Connect (OSTI)

    Schott, G.A.; Heberling, C.F.; Hulbert, G.M.

    1984-06-01T23:59:59.000Z

    This paper presents results and observations from dynamic tests and analyses performed on a 0.20 m (8 in.) diameter, thin walled piping system. The piping system is a scaled representation of a Liquid Metal Fast Breeder Reactor (LMFBR) large diameter piping loop. Prototypic piping restraints were employed, including mechanical snubbers, rigid struts, pipe hangers and non-integral pipe clamps. Snapback, sine-sweep and seismic tests were performed for various restraint configurations and piping conditions. The test results are compared to analytical predictions for verification of the methods and models used in the seismic design of LMFBR piping systems. Test program conclusions and general recommendations for piping seismic analyses are presented along with a discussion of test and analysis results.

  6. Results from dynamic tests and analyses of a medium diameter LMFBR piping system

    SciTech Connect (OSTI)

    Schott, G.A.; Hulbert, G.M.; Heberling, C.F. II

    1986-08-01T23:59:59.000Z

    This paper presents results and observations from dynamic tests and analyses performed on an 8-in. (0.20-m) diameter, thin-walled piping system. The piping system is a scaled representation of a Liquid Metal Fast Breeder Reactor (LMFBR) large diameter piping loop. Prototypic piping restraints were employed, including mechanical snubbers, rigid struts, pipe hangers and nonintegral pipe clamps. Snapback, sine-sweep and seismic tests were performed for various restraint configurations and piping conditions. The test results are compared to analytical predictions for verification of the methods and models used in the seismic design of LMFBR piping systems. Test program conclusions and general recommendations for piping seismic analyses are presented along with a discussion of test and analysis results.

  7. Rotor reference frame models of a multiloop 2-phase motor drive in brushless DC and microstepping modes

    SciTech Connect (OSTI)

    Chen, J.E. [Lockheed Missiles and Space Co. Inc., Sunnyvale, CA (United States)

    1995-12-31T23:59:59.000Z

    This paper describes non-linear models of a 2-phase permanent magnet synchronous motor drive in brushless DC and microstepping modes. The models account for everything from the main power bus up to and including the mechanical load and velocity feedback loop. In particular, the models include the power electronics for each phase complete with their internal feedback loops. Classical state space averaged power electronics models are transformed to the rotor reference frame along with the usual electromechanical variables. Since SPICE linearizes the rotor reference frame model about shaft velocity, instead of shaft angle, frequency domain methods apply. The frequency domain analysis detects unstable interactions between torque angle and deliberate feedback within the drives. Time domain simulations using stator reference frame models confirm the results. All models are SPICE-compatible but were developed on Cadence`s Analog Workbench.

  8. Determination and mapping of diameter and helicity for single-walled carbon nanotubes using nanobeam electron diffraction

    E-Print Network [OSTI]

    Qin, Lu-Chang

    of the formation energy of carbon nanotubes, while the growth prefers slightly the structure with helicity 15Determination and mapping of diameter and helicity for single-walled carbon nanotubes using June 2005 The atomic structures of 124 single-walled carbon nanotubes, described by their diameter

  9. Infrared spectra of individual semiconducting single-walled carbon nanotubes: Testing the scaling of transition energies for large diameter nanotubes

    E-Print Network [OSTI]

    Heinz, Tony F.

    of transition energies for large diameter nanotubes Matthew Y. Sfeir and James A. Misewich* Condensed Matter on the same individual nanotube over an energy range of 0.3­2.7 eV. We find that well-established energy scaling relations developed for nanotubes of smaller diameter are not consistent with the measured low-energy

  10. Spray drift collector efficiency: Assessment of deposition on 2 mm diameter PVC line in a wind tunnel

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Spray drift collector efficiency: Assessment of deposition on 2 mm diameter PVC line in a wind and Miller and Hadfield, 1989) and to trap it on passive collectors. This method is cheap and easy to set-up but the efficiency of the collectors has to be evaluated. The cylindrical collectors with a diameter of 2 mm

  11. Machine imparting complex rotary motion for lapping a spherical inner diameter

    DOE Patents [OSTI]

    Carroll, T.A.; Yetter, H.H.

    1985-01-30T23:59:59.000Z

    An apparatus for imparting complex rotary motion is used to lap an inner spherical diameter surface of a workpiece. A lapping tool consists of a dome and rod mounted along the dome's vertical axis. The workpiece containing the lapping tool is held in a gimbal which uses power derived from a secondary takeoff means to impart rotary motion about a horizontal axis. The gimbal is rotated about a vertical axis by a take means while mounted at a radially outward position on a rotating arm.

  12. Nanotube diameter optimal for channeling of high-energy particle beam

    E-Print Network [OSTI]

    V. M. Biryukov; S. Bellucci

    2002-06-04T23:59:59.000Z

    Channeling of particle beam in straight and bent single-wall nanotubes has been studied in computer simulations. We have found that the nanotubes should be sufficiently narrow in order to steer efficiently the particle beams, with preferred diameter in the order of 0.5-2 nm. Wider nanotubes, e.g. 10-50 nm, appear rather useless for channeling purpose because of high sensitivity of channeling to nanotube curvature. We have compared bent nanotubes with bent crystals as elements of beam steering technique, and found that narrow nanotubes have an efficiency of beam bending similar to that of crystals.

  13. Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers

    E-Print Network [OSTI]

    F. Warken; E. Vetsch; D. Meschede; M. Sokolowski; A. Rauschenbeutel

    2007-06-22T23:59:59.000Z

    The guided modes of sub-wavelength diameter air-clad optical fibers exhibit a pronounced evanescent field. The absorption of particles on the fiber surface is therefore readily detected via the fiber transmission. We show that the resulting absorption for a given surface coverage can be orders of magnitude higher than for conventional surface spectroscopy. As a demonstration, we present measurements on sub-monolayers of 3,4,9,10-perylene-tetracarboxylic dianhydride (PTCDA) molecules at ambient conditions, revealing the agglomeration dynamics on a second to minutes timescale.

  14. Evaluation of Manufacturability of Embedded Sensors and Controls with Canned Rotor Pump System

    SciTech Connect (OSTI)

    Kisner, Roger A [ORNL; Fugate, David L [ORNL; Melin, Alexander M [ORNL; Holcomb, David Eugene [ORNL; Wilson, Dane F [ORNL; Silva, Pamela C [ORNL; Cruz Molina, Carola [ORNL

    2013-07-01T23:59:59.000Z

    This report documents the current status of fabrication and assembly planning for the magnetic bearing, canned rotor pump being used as a demonstration platform for deeply integrating I&C into nuclear power plant components. The report identifies material choices and fabrication sequences for all of the required parts and the issues that need to be either resolved or accommodated during the manufacturing process. Down selection between material options has not yet been performed. Potential suppliers for all of the necessary materials have also been identified. The assembly evaluation begins by logically subdividing the pump into modules, which are themselves decomposed into individual parts. Potential materials and fabrication processes for each part in turn are then evaluated. The evaluation process includes assessment of the environmental compatibility requirements and the tolerances available for the selected fabrication processes. A description of the pump power/control electronics is also provided. The report also includes exploded views of the modules that show the integration of the various parts into modules that are then assembled to form the pump. Emphasis has been placed on thermal environment compatibility and the part dimensional changes during heat-up. No insurmountable fabrication or assembly challenges have been identified.

  15. Prediction of stochastic blade loads for three-bladed, rigid-hub rotors

    SciTech Connect (OSTI)

    Wright, A.D.; Weber, T.L.; Thresher, R.W.; Butterfield, C.P.

    1989-11-01T23:59:59.000Z

    Accurately predicting wind turbine blade loads and response is important for the design of future wind turbines. The need to include turbulent wind inputs in structural dynamics models is widely recognized. In this paper, the Force and Loads Analysis Program (FLAP) code will be used to predict turbulence-induced bending moments for the SERI Combined Experiment rotor blade and the Howden 330-kW blade. FLAP code predictions will be compared to the power spectra of measured blade-bending moments. Two methods will be used to generate turbulent wind inputs to FLAP: a theoretical simulation: the Pacific Northwest Laboratories (PNL) simulation theory; and measured wind-speed data taken from an array of anemometers upwind of the turbine. Turbulent wind-speed time series are input to FLAP for both methods outlined above. Power spectra of predicted flap-bending moments are compared to measured results for different wind conditions. Conclusions are also drawn as to the ability of the turbulence simulation models to provide accurate wind input to FLAP and to FLAP's ability to accurately simulate blade response to turbulence. Finally, suggestions are made as to needed improvements in the theoretical model. 11 refs., 8 figs.

  16. Demonstration of the BioBaler harvesting system for collection of small-diameter woody biomass

    SciTech Connect (OSTI)

    Langholtz, Matthew H [ORNL; Caffrey, Kevin R [ORNL; Barnett, Elliott J [ORNL; Webb, Erin [ORNL; Brummette, Mark W [ORNL; Downing, Mark [ORNL

    2011-12-01T23:59:59.000Z

    As part of a project to investigate sustainable forest management practices for producing wood chips on the Oak Ridge Reservation (ORR) for the ORNL steam plant, the BioBaler was tested in various Oak Ridge locations in August of 2011. The purpose of these tests and the subsequent economic analysis was to determine the potential of this novel woody biomass harvesting method for collection of small-diameter, low value woody biomass. Results suggest that opportunities may exist for economical harvest of low-value and liability or negative-cost biomass. (e.g., invasives). This could provide the ORR and area land managers with a tool to produce feedstock while improving forest health, controlling problem vegetation, and generating local employment.

  17. Effects of Carbon Nanotube Coating on Bubble Departure Diameter and Frequency in Pool Boiling on a Flat, Horizontal Heater

    E-Print Network [OSTI]

    Glenn, Stephen T.

    2011-08-08T23:59:59.000Z

    The effects of a carbon nanotube (CNT) coating on bubble departure diameter and frequency in pool boiling experiments was investigated and compared to those on a bare silicon wafer. The pool boiling experiments were performed at liquid subcooling...

  18. Different methods for particle diameter determination of low density and high density lipoproteins-Comparison and evaluation

    E-Print Network [OSTI]

    Vaidyanathan, Vidya

    2009-05-15T23:59:59.000Z

    . Technological advancements have introduced an array of techniques for measuring diameters of LDL and HDL as well as estimating overall particle heterogeneity. However, there is lack of comparative studies between these techniques, and, hence, no conclusive...

  19. The effects of two different environments upon the density, diameter, and length of the hair of Brahman cattle

    E-Print Network [OSTI]

    De Armas, Hector

    2012-06-07T23:59:59.000Z

    Errors of the Density, Diameter, and LenLM of Hair Ileasured on Hrah~ Calves from Oklahoma and Texas ~ Page ~ ~ ~ ~ ~ 38 2 IIangos in Density& Diameter, and Length of Hair Pieasured on Brahman Calves from Oklahoma and T exes...'sich, Oklahoma . ~ . ~ ~ . ~ . ~ 16 2 Partial Line Pedigree Showing 14Qs Lines of Descent for Calves from Hungerford& Texas ~ ~ ~ ~ ~ ? ~ ~ ~ 19 Duration of Deyiight at Oklahoma and Texas Locations . ? ? ~ ~ ~ ~ ~ . ~ ~ . ~ ? ? ~ ~ ~ . ~ ~ ? 25 4 Average...

  20. Apparatus and methods for aligning holes through wheels and spacers and stacking the wheels and spacers to form a turbine rotor

    DOE Patents [OSTI]

    Berry, Robert Randolph (Greenville, SC); Palmer, Gene David (Clifton Park, NY); Wilson, Ian David (Clifton Park, NY)

    2000-01-01T23:59:59.000Z

    A gas turbine rotor stacking fixture includes upstanding bolts for reception in aligned bolt holes in superposed aft disk, wheels and spacers and upstanding alignment rods received in openings of the disk, wheels and spacers during the rotor stacking assembly. The axially registering openings enable insertion of thin-walled tubes circumferentially about the rim of the rotor, with tight tolerances to the openings to provide supply and return steam for cooling buckets. The alignment rods have radial dimensions substantially less than their dimensions in a circumferential direction to allow for radial opening misalignment due to thermal expansion, tolerance stack-up and wheel-to-spacer mismatch due to rabbet mechanical growth. The circumferential dimension of the alignment rods affords tightly toleranced alignment of the openings through which the cooling tubes are installed.

  1. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2004-04-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast-iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1--Program Management and Task 2--were completed in prior quarters while Task 3--Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves has progressed to installing prototype sleeves in cast iron test pipe segments. Efforts in this quarter continued to focus on Tasks 4--8, with significant progress made in each. Task 4 (Design, Fabricate and Test Patch Setting Robotic Train) progressed to the design of the control electronics and pneumatic system to inflate the bladder robotic patch setting module. Task 5 (Design & Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera) continued with additional in-pipe testing required to optimize the design of the robot elements and surface control electronics and software. Task 6 (Design & Build Surface Control and Monitoring System) has been completed with the control and computer display functions being operated through LabView. Task 7 (Design & Fabricate Large Diameter Live Access System) progressed to completing the detailed design of the entry fitting for 12-inch diameter cast iron pipe. The fitting is now being placed into manufacture. Task 8--System Integration and Laboratory Validation continued developing the robot module inter-connects and development of a master LabView-based system display and control software.

  2. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M Kothari; Gerard T. Pittard

    2004-07-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple castiron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1 (Program Management) and Task 2 (Establishment of Detailed Design Specifications) were completed in prior quarters while Task 3 (Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves) has progressed to installing prototype sleeves in cast iron test pipe segments. Efforts in this quarter continued to focus on Tasks 4-8, with significant progress made in each. Task 4 (Design, Fabricate and Test Patch Setting Robotic Train) progressed to the design of the control electronics and pneumatic system to inflate the bladder robotic patch setting module. Task 5 (Design & Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera) continued with additional in-pipe testing required to optimize the design of the robot elements and surface control electronics and software. Task 6 (Design & Build Surface Control and Monitoring System) has been completed with the control and computer display functions being operated through LabView. Task 7 (Design & Fabricate Large Diameter Live Access System) progressed to completing the detailed design of the entry fitting for 12-inch diameter cast iron pipe. The fitting is now being manufactured. The 12-inch ball valve for allowing no-blow access was also procured. Task 8 (System Integration and Laboratory Validation) continued with the development of the robot module inter-connects and of a master LabView-based system display and control software.

  3. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari, Gerard T. Pittard

    2004-01-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1--Program Management and Task 2--were completed in prior quarters while Task 3--Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves has progressed to installing prototype sleeves in cast iron test pipe segments. Efforts in this quarter continued to focus on Tasks 4--8, with significant progress made in each. Task 4 (Design, Fabricate and Test Patch Setting Robotic Train) progressed to the design of the control electronics and pneumatic system to inflate the bladder robotic patch setting module. Task 5 (Design & Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera) continued with additional in-pipe testing required to optimize the design of the robot elements and surface control electronics and software. Task 6 (Design & Build Surface Control and Monitoring System) has been completed with the control and computer display functions being operated through LabView. Task 7 (Design & Fabricate Large Diameter Live Access System) progressed to the design, fabrication and testing of a entry fitting in a 4-inch prototype and is now being used to complete drawings for use in 12-inch diameter pipe. Task 8--System Integration and Laboratory Validation continued developing the robot module inter-connects and development of a master LabView-based system display and control software.

  4. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2005-01-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast-iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1 (Program Management) and Task 2 (Establishment of Detailed Design Specifications) were completed in prior quarters while Task 3 (Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves) has progressed to installing prototype sleeves in cast-iron test pipe segments. Efforts in the current quarter continued to focus on Tasks 4-8. Highly valuable lessons were learned from field tests of the 4-inch gas pipe repair robot in cast-iron pipe at Public Service Electric & Gas. (These field tests were conducted and reported last quarter.) These tests identified several design issues which need to be implemented in both the small- and large-diameter repair robots for cast-iron pipe to assure their commercial success. For Task 4 (Design, Fabricate and Test Patch Setting Robotic Train), work has been directed on increasing the nitrogen bladder reservoir volume to allow at least two complete patch inflation/patch setting cycles in the event the sleeve does not set all ratchets in the same row on the first attempt. This problem was observed on a few of the repair sleeves that were recently installed during field tests with the small-diameter robotic system. For Task 5 (Design & Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera), the recent field tests showed clearly that, in mains with low gas velocities, it will be necessary to improve the system's capacity to remove debris from the immediate vicinity of the bell and spigot joints. Otherwise, material removed by the cleaning flails (the flails were found to be very effective in cleaning bell and spigot joints) falls directly to the low side of the pipe and accumulates in a pile. This accumulation can prevent the sleeve from achieving a leak-free repair. Similarly, it is also deemed necessary to design an assembly to capture existing service-tap coupons and allow their removal from the inside of the pipe. These coupons were found to cause difficulty in launching and retrieving the small pipe repair robot; for example, one coupon lodged beneath the end of the guide shoe. Designs for new features to accomplish these goals for the large robotic system were pursued and are presented in this report. Task 6 (Design & Build Surface Control and Monitoring System) was previously completed with the control and computer display functions being operated through LabVIEW. However, this must now be revisited to add control routines for the coupon catcher to be added. This will most likely include a lift-off/place-on magnet translation function. Task 7 (Design & Fabricate Large Diameter Live Access System) progressed to completing the detailed design of the entry fitting for 12-inch diameter cast iron pipe in the previous quarter. Field tests with the 4-inch

  5. Apparatus and Method for Increasing the Diameter of Metal Alloy Wires Within a Molten Metal Pool

    DOE Patents [OSTI]

    Hartman, Alan D.; Argetsinger, Edward R.; Hansen, Jeffrey S.; Paige, Jack I.; King, Paul E.; Turner, Paul C.

    2002-01-29T23:59:59.000Z

    In a dip forming process the core material to be coated is introduced directly into a source block of coating material eliminating the need for a bushing entrance component. The process containment vessel or crucible is heated so that only a portion of the coating material becomes molten, leaving a solid portion of material as the entrance port of, and seal around, the core material. The crucible can contain molten and solid metals and is especially useful when coating core material with reactive metals. The source block of coating material has been machined to include a close tolerance hole of a size and shape to closely fit the core material. The core material moves first through the solid portion of the source block of coating material where the close tolerance hole has been machined, then through a solid/molten interface, and finally through the molten phase where the diameter of the core material is increased. The crucible may or may not require water-cooling depending upon the type of material used in crucible construction. The system may operate under vacuum, partial vacuum, atmospheric pressure, or positive pressure depending upon the type of source material being used.

  6. Qualification of large diameter duplex stainless steel girth welds intended for low temperature service

    SciTech Connect (OSTI)

    Prosser, K.; Robinson, A.G.; Rogers, P.F.

    1996-12-31T23:59:59.000Z

    British Gas recently had a requirement to fabricate some UNS31803 duplex stainless steel pipework for an offshore topsides process plant. The pipework had a maximum diameter of 600mm, with a corresponding wall thickness of 18mm, and it was designed to operate at a minimum temperature of {minus}40 C. There is a lack of published toughness data for girth welds in duplex stainless steel at this thickness and minimum design temperature. Additionally, toughness requirements for girth welds in current pipework and pressure vessel codes are based on experience with carbon steels. As a result, a program of work has been carried out to study the Charpy, CTOD and wide plate toughness of girth welds in 22%Cr duplex stainless steel pipework. The welds were produced using a typical gas tungsten arc/gas metal arc pipework fabrication procedure. In addition, non-destructive evaluation trials have been carried out on a deliberately defective weld using radiography and ultrasonics. It was demonstrated that double wall single image {gamma}-radiography, single wall single image and panoramic X-radiography, and conventional shear wave ultrasonics were all able to detect planar root defects varying from 3 to 7mm in depth. There was good agreement between the sizes recorded by ultrasonics and those measured from macrosections. Small scale mechanical tests demonstrated that welds with overmatching tensile properties, and low temperature toughness properties which were acceptable to specification, could be produced. Wide plate tests demonstrated that defect size calculations from BS PD7493 were conservative.

  7. The orifice expansion correction for a 50 mm line size at various diameter ratios

    SciTech Connect (OSTI)

    Seidl, W. [Colorado Engineering Experiment Station, Inc., Nunn, CO (United States)

    1995-12-31T23:59:59.000Z

    The expansion coefficient or factor for a compressible flowmeter corrects for the change in pressure and density as the fluid is accelerated through the flowmeter. The expansion correction currently in use in the United States and also in other countries was developed over fifty years ago by Buckingham and Bean. More recent work reported by Kinghorn shows the equation currently in use to be in error. This paper describes the results of a test program to determine the expansion factors for flange-tapped sharp-edged orifices with diameter ratios between 0.242 and 0.726 in a nominal 50 mm (2 inch) line. Critical flow Venturis are used as the reference standards and dry air as the flowing fluid. The ratio of differential pressure to inlet static pressure is varied over a range of zero to about 0.2 at a constant Reynolds number. The expansion factor is determined form the apparent change in discharge coefficient at a constant Reynolds number.

  8. Apparatus and method for increasing the diameter of metal alloy wires within a molten metal pool

    DOE Patents [OSTI]

    Hartman, Alan D. (Albany, OR); Argetsinger, Edward R. (Albany, OR); Hansen, Jeffrey S. (Corvallis, OR); Paige, Jack I. (Albany, OR); King, Paul E. (Corvallis, OR); Turner, Paul C. (Independence, OR)

    2002-01-29T23:59:59.000Z

    In a dip forming process the core material to be coated is introduced directly into a source block of coating material eliminating the need for a bushing entrance component. The process containment vessel or crucible is heated so that only a portion of the coating material becomes molten, leaving a solid portion of material as the entrance port of, and seal around, the core material. The crucible can contain molten and solid metals and is especially useful when coating core material with reactive metals. The source block of coating material has been machined to include a close tolerance hole of a size and shape to closely fit the core material. The core material moves first through the solid portion of the source block of coating material where the close tolerance hole has been machined, then through a solid/molten interface, and finally through the molten phase where the diameter of the core material is increased. The crucible may or may not require water-cooling depending upon the type of material used in crucible construction. The system may operate under vacuum, partial vacuum, atmospheric pressure, or positive pressure depending upon the type of source material being used.

  9. STELLAR DIAMETERS AND TEMPERATURES. II. MAIN-SEQUENCE K- AND M-STARS

    SciTech Connect (OSTI)

    Boyajian, Tabetha S.; McAlister, Harold A.; Jones, Jeremy; White, Russel; Henry, Todd; Gies, Douglas; Jao, Wei-Chun; Parks, J. Robert [Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P.O. Box 4106, Atlanta, GA 30302-4106 (United States); Von Braun, Kaspar; Kane, Stephen R.; Ciardi, David [NASA Exoplanet Science Institute, California Institute of Technology, MC 100-22, Pasadena, CA 91125 (United States); Van Belle, Gerard [Lowell Observatory, Flagstaff, AZ 86001 (United States); Ten Brummelaar, Theo A.; Schaefer, Gail; Sturmann, Laszlo; Sturmann, Judit [The CHARA Array, Mount Wilson Observatory, Mount Wilson, CA 91023 (United States); Muirhead, Philip S. [Department of Astronomy, California Institute of Technology, 1200 East California Boulevard, MC 249-17, Pasadena, CA 91125 (United States); Lopez-Morales, Mercedes [Institut de Ciencies de L'Espai (CSIC-IEEC), E-08193 Bellaterra (Spain); Ridgway, Stephen [National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726-6732 (United States); Rojas-Ayala, Barbara [Department of Astrophysics, Division of Physical Sciences, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); and others

    2012-10-01T23:59:59.000Z

    We present interferometric angular diameter measurements of 21 low-mass, K- and M-dwarfs made with the CHARA Array. This sample is enhanced by adding a collection of radius measurements published in the literature to form a total data set of 33 K-M-dwarfs with diameters measured to better than 5%. We use these data in combination with the Hipparcos parallax and new measurements of the star's bolometric flux to compute absolute luminosities, linear radii, and effective temperatures for the stars. We develop empirical relations for {approx}K0 to M4 main-sequence stars that link the stellar temperature, radius, and luminosity to the observed (B - V), (V - R), (V - I), (V - J), (V - H), and (V - K) broadband color index and stellar metallicity [Fe/H]. These relations are valid for metallicities ranging from [Fe/H] = -0.5 to +0.1 dex and are accurate to {approx}2%, {approx}5%, and {approx}4% for temperature, radius, and luminosity, respectively. Our results show that it is necessary to use metallicity-dependent transformations in order to properly convert colors into stellar temperatures, radii, and luminosities. Alternatively, we find no sensitivity to metallicity on relations we construct to the global properties of a star omitting color information, e.g., temperature-radius and temperature-luminosity. Thus, we are able to empirically quantify to what order the star's observed color index is impacted by the stellar iron abundance. In addition to the empirical relations, we also provide a representative look-up table via stellar spectral classifications using this collection of data. Robust examinations of single star temperatures and radii compared to evolutionary model predictions on the luminosity-temperature and luminosity-radius planes reveal that models overestimate the temperatures of stars with surface temperatures <5000 K by {approx}3%, and underestimate the radii of stars with radii <0.7 R{sub Sun} by {approx}5%. These conclusions additionally suggest that the models over account for the effects that the stellar metallicity may have on the astrophysical properties of an object. By comparing the interferometrically measured radii for the single star population to those of eclipsing binaries, we find that for a given mass, single and binary star radii are indistinguishable. However, we also find that for a given radius, the literature temperatures for binary stars are systematically lower compared to our interferometrically derived temperatures of single stars by {approx}200 to 300 K. The nature of this offset is dependent on the validation of binary star temperatures, where bringing all measurements to a uniform and correctly calibrated temperature scale is needed to identify any influence stellar activity may have on the physical properties of a star. Lastly, we present an empirically determined H-R diagram using fundamental properties presented here in combination with those in Boyajian et al. for a total of 74 nearby, main-sequence, A- to M-type stars, and define regions of habitability for the potential existence of sub-stellar mass companions in each system.

  10. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2004-11-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple castiron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1 (Program Management) and Task 2 (Establishment of Detailed Design Specifications) were completed in prior quarters while Task 3 (Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves) has progressed to installing prototype sleeves in cast iron test pipe segments. Efforts in this quarter continued to focus on Tasks 4-8, with significant progress made in each as well as field testing of the 4-inch gas pipe repair robot in cast iron pipe at Public Service Electric & Gas. The field tests were conducted August 23-26, 2004 in Oradell, New Jersey. The field tests identified several design issues which need to be implemented in both the small- and large-diameter cast iron repair robots to assure their commercial success. Task 4 (Design, Fabricate and Test Patch Setting Robotic Train) progressed to the design of the control electronics and pneumatic system to inflate the bladder robotic patch setting module in the last quarter 5. In this quarter, work has been concentrated on increasing the nitrogen bladder reservoir volume to allow at least two complete patch inflation/patch setting cycles in the event the sleeve does not set all ratchets in the same row on the first attempt. This problem was observed on a few of the repair sleeves that were recently installed during field tests with the small-diameter robotic system. For Task 5 (Design & Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera) it was observed that it will be necessary to add a stiff brush to push debris away from the immediate vicinity of the bell and spigot joints in mains having low gas velocities. Otherwise, material removed by the cleaning flails (which were found to be very effective in cleaning bell and spigot joints) simply falls to the low side of the pipe and accumulates in a pile. This accumulation can prevent the sleeve from achieving a leak free repair. Similarly, it is also necessary to design a small magnet to capture existing service tap coupons and allow their removal from the inside of the pipe. These coupons were found to cause difficulty in launching and retrieving the small pipe repair robot; one coupon lodged beneath the end of the guide shoe. These new features require redesign of the pipe wall cleaning train and modification to the patch setting train. Task 6 (Design & Build Surface Control and Monitoring System) was previously completed with the control and computer display functions being operated through LabView. However, this must now be re-visited to add control routines for the coupon catcher to be added. This will most likely include a lift-off/place-on magnet translation function. Task 7 (Design & Fabricate Large Diameter Live Access System) progressed to completing the detailed design of th

  11. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2005-04-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast-iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of old cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1 (Program Management) and Task 2 (Establishment of Detailed Design Specifications) were completed previously. Task 3 (Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves) has progressed to installing prototype sleeves in test cast-iron pipe segments. Efforts in the current quarter continued to be focused on Tasks 4-8. Highly valuable lessons were learned from field tests of the 4-inch gas pipe repair robot in cast-iron pipe at Public Service Electric & Gas. (These field tests were conducted and reported previously.) Several design issues were identified which need to be implemented in both the small- and large-diameter repair robots for cast-iron pipe to assure their commercial success. For Task 4 (Design, Fabricate and Test Patch Setting Robotic Train), previous problems with bladder design and elastomeric material expansion in the large mains were addressed. A new bladder based on a commercially available design was obtained and tested with success. Minor improvements were highlighted during patch-setting tests and are now being pursued. For Task 5 (Design and Fabricate Pipe-Wall Cleaning Robot Train with Pan/Zoom/Tilt Camera), the previous field tests showed clearly that, in mains with low gas velocities, it will be necessary to improve the system's capacity to remove debris from the immediate vicinity of the bell and spigot joints. Otherwise, material removed by the cleaning flails (the flails were found to be very effective in cleaning bell and spigot joints) falls directly to the low side of the pipe and accumulates in a pile. This accumulation can prevent the sleeve from achieving a leak-free repair. Similarly, it is also deemed necessary to design an assembly to capture existing servicetap coupons and allow their removal from the inside of the pipe. Task 6 (Design and Build Surface Control and Monitoring System) was previously completed with the control and computer display functions being operated through LabVIEW. However, this must now be revisited to add control routines for the coupon catcher that will be added. This will most likely include a lift-off/place-on magnet translation function. Task 7 (Design and Fabricate Large Diameter Live Access System) progressed to completing the detailed design for a bolt-on entry fitting for 12-inch diameter cast-iron pipe in the current quarter. The drilling assembly for cutting an access hole through the wall of the gas main was also designed, along with a plug assembly to allow removing all tools from the live main and setting a blind flange on the entry fitting prior to burial. These designs are described in detail in the report. Task 8 (System Integration and Laboratory Validation) continued with the development of the robot module i

  12. Real-time Stereo Visual Servoing Control of an UAV having Eight-Rotors Sergio Salazar, Hugo Romero, Jose Gomez and Rogelio Lozano

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Real-time Stereo Visual Servoing Control of an UAV having Eight-Rotors Sergio Salazar, Hugo Romero UAV using image-based visual servoing with stereo vision. In order to control the orientation vision system we are able to estimate the UAV 3D position, while from the inertial sensors we can obtain

  13. Turbine blade platform film cooling with simulated stator-rotor purge flow with varied seal width and upstream wake with vortex

    E-Print Network [OSTI]

    Blake, Sarah Anne

    2009-05-15T23:59:59.000Z

    . The coolant was injected through an advanced labyrinth seal to simulate purge flow through a stator-rotor seal. The width of the opening of this seal was varied to simulate the effect of misalignment. Stationary rods were placed upstream of the cascade in four...

  14. Analyse numrique qualitative d'interactions rotor/stator dans un compresseur haute pression d'un moteur d'hlicoptre

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    are carried out on the centrifugal compressor of a modern heli- copter engine, for which it is assumed méthodologie systématique d'analyse. Les simulations d'interaction sont réalisées sur un compresseur centrifuge-harmoniques du chargement imposé. A qualitative numerical analysis of rotor-casing interactions in centrifugal

  15. Preliminary Structural Design Conceptualization for Composite Rotor for Verdant Power Water Current: Cooperative Research and Development Final Report, CRADA Number CRD-08-296

    SciTech Connect (OSTI)

    Hughes, S.

    2011-02-01T23:59:59.000Z

    The primary thrust of the CRADA will be to develop a new rotor design that will allow higher current flows (>4m/s), greater swept area (6-11m), and in the process, will maximize performance and energy capture.

  16. Measurements versus Predictions for a Hybrid (Hydrostatic plus Hydrodynamic Thrust Bearing for a Range of Orifice Diameters

    E-Print Network [OSTI]

    Esser, Paul R.

    2011-08-08T23:59:59.000Z

    bearings with three different orifice diameters (1.63, 1.80, and 1.93 mm) are tested for a range of supply pressures, fluid film thicknesses, and rotational speeds. The water-lubricated test bearings have eight pockets, with feed orifices located centrally...

  17. Effects of the hydraulic coupling between xylem and phloem on diurnal phloem diameter variationpce_2275 690..703

    E-Print Network [OSTI]

    Holbrook, N. Michele

    Effects of the hydraulic coupling between xylem and phloem on diurnal phloem diameter variationpce in the radial flow rate of water between the xylem and the phloem. Reducing the hydraulic con- ductance between variations that cannot be explained by changes in the hydraulic conductance, could be related to changes

  18. The effects of 100 nm-diameter Au nanoparticles on dye-sensitized solar Changwoo Nahm,1

    E-Print Network [OSTI]

    Park, Byungwoo

    The effects of 100 nm-diameter Au nanoparticles on dye-sensitized solar cells Changwoo Nahm,1 nanoparticles for dye-sensitized solar cells (DSSCs). At the optimum Au/TiO2 mass ratio of 0.05, the power nanoparticles were also introduced to the electrodes of dye-sensitized solar cells (DSSCs), and the solar-cell

  19. Salt-Dependent DNA Superhelix Diameter Studied by Small Angle Neutron Scattering Measurements and Monte Carlo Simulations

    E-Print Network [OSTI]

    Langowski, Jörg

    Salt-Dependent DNA Superhelix Diameter Studied by Small Angle Neutron Scattering Measurements-38042 Grenoble Cedex 9, France ABSTRACT Using small angle neutron scattering we have measured the static the same behavior between 10 and 100 mM salt concentration: An undulation in the scattering curve

  20. Growth and properties of SiNCO nanocones and graphitic nanofibers synthesized using three-nanometer diameter

    E-Print Network [OSTI]

    Liu, Jie

    were minimized had the "stacked-cup" structure, and well-defined voids could be observed within aligned carbon nano- fibers (VACNFs) is interesting for fundamental under- standing of nanomaterial growth diameter of 3 (±1) nm. The nanocones were produced on laterally widely dispersed catalyst particles

  1. Experimental investigation of interfacial shear in downward, two-phase, annular, co-current flow with diameter effects

    SciTech Connect (OSTI)

    Hajiloo, M.

    1983-02-01T23:59:59.000Z

    An experimental rig has been designed and built to provide two phase annular cocurrent downward flow of air and water in tubes of four different inside diameters, ranging from 1.563 cm - 4.127 cm. Flow rates of the phases and static pressure drop were measured over a range of liquid film Reynolds numbers from 5000 to 26,700, and a range of air Reynolds numbers of 4500 to 21,400. The resulting data for the skin friction coefficient are in qualitative agreement with most previously obtained pertinent data. Various ways of presenting the data are explored and discussed, including the use of superficial, true, and relative gas velocities. The effect of the controlled parameters on the skin friction coefficient is discussed, and the importance of the dependence of skin friction coefficient on tube diameter is emphasized.

  2. Convective currents in nucleate pool boiling and their effects on the heat flux from varying diameter flat plate heating elements

    E-Print Network [OSTI]

    Morford, Peter Stephen

    1980-01-01T23:59:59.000Z

    investigation was conducred to amine the effects of convection currents in nucleate oool boil ing and to determine the changes in critical heat flux caused by varying the diameter of horizontal flat olate heating surfaces. Freon 113 (Trichlorotrifluoroethane... by high energy costs and thc need to economize in industrial heat transfer applications . I'nucleate boiling is a very efficient neans of heat transfer because of the large sur ace areas involved in vaporization of the bulk fluid. as bubbles form...

  3. Backward Precessional Whip and Whirl for a Two Point Rubbing Contact Model of a Rigid Rotor Supported by an Elastically Supported Rigid Stator

    E-Print Network [OSTI]

    Kumar, Dhruv Dileep

    2011-10-21T23:59:59.000Z

    of rotor motion [L] csL, crL Damping constants [F t/L] CrL,CrR Clearance at rub surface [L] Dw W11W22-W 2 as introduce in Eq.(27) frLX, frRX, frLY frRY Reaction forces on the rotor at 2 contacts in the 2 planes [F] fL fR Reaction forces... components at the contact points are cos sin , sin cos cos sin , sin cos rLX L fL rLY L fL rRX R fR rRY R fR f N f f N f f N f f N f ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (14) For this result, (cos sin ) (cos sin ) ( ) ( ) L...

  4. Synchronous motor with soft start element formed between the motor rotor and motor output shaft to successfully synchronize loads that have high inertia and/or high torque

    DOE Patents [OSTI]

    Umans, Stephen D; Nisley, Donald L; Melfi, Michael J

    2014-10-28T23:59:59.000Z

    A line-start synchronous motor has a housing, a rotor shaft, and an output shaft. A soft-start coupling portion is operatively coupled to the output shaft and the rotor shaft. The soft-start coupling portion is configurable to enable the synchronous motor to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling. The synchronous motor is sufficiently rated to obtain synchronous operation and to drive, at least near synchronous speed during normal steady state operation of the motor, a load having characteristics sufficient to prevent obtaining normal synchronous operation of the motor when the motor is operatively connected to the load in the absence of the soft-start coupling.

  5. Reliability of steam-turbine rotors. Task 1. Lifetime prediction analysis system. Final report. [Using STRAP and SAFER computer codes and boresonic data

    SciTech Connect (OSTI)

    Nair, P.K.; Pennick, H.G.; Peters, J.E.; Wells, C.H.

    1982-12-01T23:59:59.000Z

    Task 1 of RP 502, Reliability of Steam Turbine Rotors, resulted in the development of a computerized lifetime prediction analysis system (STRAP) for the automatic evaluation of rotor integrity based upon the results of a boresonic examination of near-bore defects. Concurrently an advanced boresonic examination system (TREES), designed to acquire data automatically for lifetime analysis, was developed and delivered to the maintenance shop of a major utility. This system and a semi-automated, state-of-the-art system (BUCS) were evaluated on two retired rotors as part of the Task 2 effort. A modified nonproprietary version of STRAP, called SAFER, is now available for rotor lifetime prediction analysis. STRAP and SAFER share a common fracture analysis postprocessor for rapid evaluation of either conventional boresonic amplitude data or TREES cell data. The final version of this postprocessor contains general stress intensity correlations for elliptical cracks in a radial stress gradient and provision for elastic-plastic instability of the ligament between an imbedded crack and the bore surface. Both linear elastic and ligament rupture models were developed for rapid analysis of linkup within three-dimensional clusters of defects. Bore stress-rupture criteria are included, but a creep-fatigue crack growth data base is not available. Physical and mechanical properties of air-melt 1CrMoV forgings are built into the program; however, only bounding values of fracture toughness versus temperature are available. Owing to the lack of data regarding the probability of flaw detection for the boresonic systems and of quantitative verification of the flaw linkup analysis, automatic evlauation of boresonic results is not recommended, and the lifetime prediction system is currently restricted to conservative, deterministic analysis of specified flaw geometries.

  6. Modeling Creep-Fatigue-Environment Interactions in Steam Turbine Rotor Materials for Advanced Ultra-supercritical Coal Power Plants

    SciTech Connect (OSTI)

    Shen, Chen

    2014-01-20T23:59:59.000Z

    The goal of this project is to model creep-fatigue-environment interactions in steam turbine rotor materials for advanced ultra-supercritical (A-USC) coal power Alloy 282 plants, to develop and demonstrate computational algorithms for alloy property predictions, and to determine and model key mechanisms that contribute to the damages caused by creep-fatigue-environment interactions. The nickel based Alloy 282 is selected for this project because it is one of the leading candidate materials for the high temperature/pressure section of an A-USC steam turbine. The methods developed in the project are expected to be applicable to other metal alloys in similar steam/oxidation environments. The major developments are: ? failure mechanism and microstructural characterization ? atomistic and first principles modeling of crack tip oxygen embrittlement ? modeling of gamma prime microstructures and mesoscale microstructure-defect interactions ? microstructure and damage-based creep prediction ? multi-scale crack growth modeling considering oxidation, viscoplasticity and fatigue The technology developed in this project is expected to enable more accurate prediction of long service life of advanced alloys for A-USC power plants, and provide faster and more effective materials design, development, and implementation than current state-of-the-art computational and experimental methods. This document is a final technical report for the project, covering efforts conducted from January 2011 to January 2014.

  7. Measured Results for a New Hole-Pattern Annular Gas Seal Incorporating Larger Diameter Holes, Comparisons to Results for a Traditional Hole-Pattern Seal and Predictions

    E-Print Network [OSTI]

    Vannarsdall, Michael Lloyd

    2012-10-19T23:59:59.000Z

    ? gamma ratio [-] j i x F ? ? Definition of stiffness [F/L] i j F x ? ? Definition of damping [F.t/L] i j F x ? ? Definition of added mass [M] ijH? Dynamic uncertainty [F/L] or [F.t/L] P? ? ? Pressure difference [F/L2...]? entrance loss P? ? Entrance loss pressure difference [F/L2]? entrance loss P'? ? Entrance loss pressure difference of seal [F/L2]? ?x, ?y Relative motion between the rotor and the stator [L] ?? ? Leakage coefficient [-] ? Non-dimensional mass...

  8. Growth and stability of stress corrosion cracks in large-diameter BWR piping. Volume 2: appendixes. Final report

    SciTech Connect (OSTI)

    Hale, D A; Heald, J D; Horn, R M; Jewett, C W; Kass, J N; Mehta, H S; Ranganath, S; Sharma, S R

    1982-07-01T23:59:59.000Z

    This report presents the results of a research program conducted to evaluate the behavior of hypothetical stress corrosion cracks in large diameter austenitic piping. The program included major tasks, a design margin assessment, an evaluation of crack growth and crack arrest, and development of a predictive model. As part of the margin assessment, the program developed diagrams which predicted net section collapse as a function of crack size. In addition, plasticity and dynamic load effects were also considered in evaluating collapse. Analytical methods for evaluating these effects were developed and were benchmarked by dynamic tests of 4-in.-diameter piping. The task of evaluating the growth behavior of stress corrosion cracks focused on developing constant load and cyclic growth rate data that could be used with the predictive model. Secondly, laboratory tests were performed to evaluate the conditions under which growing stress corrosion cracks would arrest when they intersected stress corrosion resistant weld metal. The third task successfully developed a model to predict the behavior of cracks in austenitic piping.

  9. Orbital inside diameter welder

    DOE Patents [OSTI]

    Patterson, R.A.; Mitchell, J.O.

    1982-07-23T23:59:59.000Z

    The disclosure relates to welding apparatus and more particularly to apparatus for welding together two abutted cylinders from the inside of the joint.

  10. Test versus predictions for rotordynamic and leakage characteristics of a convergent-tapered, honeycomb-stator/smooth-rotor annular gas seal

    E-Print Network [OSTI]

    Van Der Velde Alvarez, Daniel Eduardo

    2009-05-15T23:59:59.000Z

    This thesis presents the results for measured and predicted rotordynamic coefficients and leakage for a convergent-tapered honeycomb seal (CTHC). The test seals had a diameter of 114.968 mm (4.5263 in) at the entrance, and a diameter of 114.709 mm...

  11. Sizing DNA Using a Nanometer-Diameter Pore Jiunn B. Heng, Chuen Ho, Taekyung Kim, Rolf Timp, Aleksij Aksimentiev, Yelena V. Grinkova, Stephen Sligar,

    E-Print Network [OSTI]

    Croquette, Vincent

    Sizing DNA Using a Nanometer-Diameter Pore Jiunn B. Heng, Chuen Ho, Taekyung Kim, Rolf Timp et al., 1996; Akeson et al., 1999; Heng et al., 2003; Li et al., 2003; Mara et al., 2004

  12. Stochastically generating tree diameter lists to populate forest stands based on the linkage variables, forest type and stand age.

    SciTech Connect (OSTI)

    Parresol, B.R.; Lloyd, F.T.

    2003-08-31T23:59:59.000Z

    Forest inventory data were used to develop a stand-age-driven, stochastic predictor of unit-area, frequency-weighted lists of breast high tree diameters (DBH). The average of mean statistics from 40-simulation prediction sets of an independent 78-plot validation dataset differed from the observed validation means by 0.5 cm for DBH, and by 12 trees/h for density. The 40-simulation average of standard deviation, quartile range, maximum value and minimum value differed from the validation dataset, respectively, by 0.3, 1.3, 0.6 and 1.5 cm for DBH, and 10, 42, 29, and 54 trees/h for density. In addition, test statistics were also computed individually for each of the 40 single simulations of the 78-plot validation dataset. In all cases, the test statistics supported the null hypothesis of no difference between simulated and observed DBH lists. When power of these hypothesis test statistics was set to 80%, the calculated minimum detectable differences were still reasonably small at 2.7 cm for mean DBH and 90 trees/h for stocking. Also, the shape and dispersion of simulated mean-DBH/density scatter graphs were similar to the same scatter graph from the observed, validation dataset.

  13. Heat Transfer -2 A pure platinum wire with diameter D = 3 mm and length L = 20 mm is placed outside on a day when air temperature

    E-Print Network [OSTI]

    Virginia Tech

    Heat Transfer - 2 A pure platinum wire with diameter D = 3 mm and length L = 20 mm is placed outside on a day when air temperature T = 10o C. The heat transfer coefficient at the wire's surface h equation that includes all heat transfer mechanisms involved in this problem. Write this energy balance

  14. To obtain representative temperatures, sensors were made with a length of 35 cm. The stainless steel needles have a diameter of 3 mm. Inside are five

    E-Print Network [OSTI]

    Haak, Hein

    To obtain representative temperatures, sensors were made with a length of 35 cm. The stainless steel needles have a diameter of 3 mm. Inside are five Platinum Pt-100 sensors, that are cascaded in series to obtain a Pt-500 sensor. The sensors are calibrated to retrieve individual calibration

  15. Fluid Mechanics -1 An oil is used in a heat exchanger. The internal geometry consists of many small diameter tubes of fixed length

    E-Print Network [OSTI]

    Virginia Tech

    Fluid Mechanics - 1 An oil is used in a heat exchanger. The internal geometry consists of many small diameter tubes of fixed length (mounted in a bundle as indicated in the sketch). The oil is pumped). Assume the steady flow of the oil through each small tube is in the laminar regime. It is proposed

  16. Quality inspection of small diameter polymeric medical tubing and attached wire stent using TAP-NDE and the Gabor Wavelet Transform

    E-Print Network [OSTI]

    Harms, Kent David

    2012-06-07T23:59:59.000Z

    A non-contact, laser-optic based technique referred to as the Thermo-Acousto-Photonic Nondestructive Evaluation (TAP-NDE) was utilized to investigate bond integrity and localized stiffening due to an attached wire stent on small diameter polymeric...

  17. Wind turbine/generator set having a stator cooling system located between stator frame and active coils

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2012-11-13T23:59:59.000Z

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  18. Wind turbine having a direct-drive drivetrain

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2011-02-22T23:59:59.000Z

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  19. A forgotten little chapter on isoperimetric inequalities: On the fraction of a convex and closed plane area lying outside a circle with which it shares a diameter

    E-Print Network [OSTI]

    Jose M. Pacheco

    2007-01-21T23:59:59.000Z

    Often some interesting or simply curious points are left out when developing a theory. It seems that one of them is the existence of an upper bound for the fraction of area of a convex and closed plane area lying outside a circle with which it shares a diameter, a problem stemming from the theory of isoperimetric inequalities. In this paper such a bound is constructed and shown to be attained for a particular area. It is also shown that convexity is a necessary condition in order to avoid the whole area lying outside the circle.

  20. The combustion of large particles of char in bubbling fluidized beds: The dependence of Sherwood number and the rate of burning on particle diameter

    SciTech Connect (OSTI)

    Dennis, J.S.; Hayhurst, A.N.; Scott, S.A. [University of Cambridge, Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, England (United Kingdom)

    2006-11-15T23:59:59.000Z

    Particles of char derived from a variety of fuels (e.g., biomass, sewage sludge, coal, or graphite), with diameters in excess of {approx}1.5mm, burn in fluidized bed combustors containing smaller particles of, e.g., sand, such that the rate is controlled by the diffusion both of O{sub 2} to the burning solid and of the products CO and CO{sub 2} away from it into the particulate phase. It is therefore important to characterize these mass transfer processes accurately. Measurements of the burning rate of char particles made from sewage sludge suggest that the Sherwood number, Sh, increases linearly with the diameter of the fuel particle, d{sub char} (for d{sub char}>{approx}1.5mm). This linear dependence of Sh on d{sub char} is expected from the basic equation Sh=2{epsilon}{sub mf}(1+d{sub char}/2{delta}{sub diff})/{tau}, provided the thickness of the boundary layer for mass transfer, {delta}{sub diff}, is constant in the region of interest (d{sub char}>{approx}1.5mm). Such a dependence is not seen in the empirical equations currently used and based on the Frossling expression. It is found here that for chars made from sewage sludge (for d{sub char}>{approx}1.5mm), the thickness of the boundary layer for mass transfer in a fluidized bed, {delta}{sub diff}, is less than that predicted by empirical correlations based on the Frossling expression. In fact, {delta}{sub diff} is not more than the diameter of the fluidized sand particles. Finally, the experiments in this study indicate that models based on surface renewal theory should be rejected for a fluidized bed, because they give unrealistically short contact times for packets of fluidized particles at the surface of a burning sphere. The result is the new correlation Sh = 2{epsilon}{sub mf}/{tau} + (A{sub cush}/A{sub char})(d{sub char}/ {delta}{sub diff}) for the dependence of Sh on d{sub char}, the diameter of a burning char particle. This equation is based on there being a gas-cushion of fluidizing gas underneath a burning char particle; the implication of this correlation is that a completely new picture emerges for the combustion of a char particle in a hot fluidized bed. (author)

  1. Structural health and prognostics management for offshore wind turbines : case studies of rotor fault and blade damage with initial O&M cost modeling.

    SciTech Connect (OSTI)

    Myrent, Noah J. [Purdue Center for Systems Integrity, Lafayette, IN; Kusnick, Joshua F. [Purdue Center for Systems Integrity, Lafayette, IN; Barrett, Natalie C. [Purdue Center for Systems Integrity, Lafayette, IN; Adams, Douglas E. [Purdue Center for Systems Integrity, Lafayette, IN; Griffith, Daniel Todd

    2013-04-01T23:59:59.000Z

    Operations and maintenance costs for offshore wind plants are significantly higher than the current costs for land-based (onshore) wind plants. One way to reduce these costs would be to implement a structural health and prognostic management (SHPM) system as part of a condition based maintenance paradigm with smart load management and utilize a state-based cost model to assess the economics associated with use of the SHPM system. To facilitate the development of such a system a multi-scale modeling approach developed in prior work is used to identify how the underlying physics of the system are affected by the presence of damage and faults, and how these changes manifest themselves in the operational response of a full turbine. This methodology was used to investigate two case studies: (1) the effects of rotor imbalance due to pitch error (aerodynamic imbalance) and mass imbalance and (2) disbond of the shear web; both on a 5-MW offshore wind turbine in the present report. Based on simulations of damage in the turbine model, the operational measurements that demonstrated the highest sensitivity to the damage/faults were the blade tip accelerations and local pitching moments for both imbalance and shear web disbond. The initial cost model provided a great deal of insight into the estimated savings in operations and maintenance costs due to the implementation of an effective SHPM system. The integration of the health monitoring information and O&M cost versus damage/fault severity information provides the initial steps to identify processes to reduce operations and maintenance costs for an offshore wind farm while increasing turbine availability, revenue, and overall profit.

  2. Criticality Safety Study of UF6and UO2F2in 8-in. Inner Diameter Piping

    SciTech Connect (OSTI)

    Elam, K.R.

    2003-10-07T23:59:59.000Z

    The purpose of this report is to provide an evaluation of the criticality safety aspects of using up to 8-in.-inner-diameter (ID) piping as part of a system to monitor the {sup 235}U enrichment in uranium hexafluoride (UF{sub 6}) gas both before and after an enrichment down-blending operation. The evaluated operation does not include the blending stage but includes only the monitors and the piping directly associated with the monitors, which are in a separate room from the blending operation. There are active controls in place to limit the enrichment of the blended UF{sub 6} to a maximum of 5 weight percent (wt%) {sup 235}U. Under normal operating conditions of temperature and pressure, the UF{sub 6} will stay in the gas phase and criticality will not be credible. The two accidents of concern are solidification of the UF{sub 6} along with some hydrofluoric acid (HF) and water or moisture ingress, which would cause the UF{sub 6} gas to react and form a hydrated uranyl fluoride (UO{sub 2}F{sub 2}) solid or solution. Of these two types of accidents, the addition of water and formation of UO{sub 2}F{sub 2} is the most reactive scenario and thus limits related to UO{sub 2}F{sub 2} will bound the limits related to UF{sub 6}. Two types of systems are included in the monitoring process. The first measures the enrichment of the approximately 90 wt% enriched UF{sub 6} before it is blended. This system uses a maximum 4-in.-(10.16-cm-) ID pipe, which is smaller than the 13.7-cm-cylinder-diameter subcritical limit for UO{sub 2}F{sub 2} solution of any enrichment as given in Table 1 of American National Standard ANSI/ANS-8.1.1 Therefore, this system poses no criticality concerns for either accident scenario. The second type of system includes two enrichment monitors for lower-enriched UF{sub 6}. One monitors the approximately 1.5 wt% enriched UF{sub 6} entering the blending process, and the second monitors the approximately 5 wt% enriched UF{sub 6} coming out of the blending process. Both use a maximum 8-in.-(20.32-cm-) ID piping, where the length of the larger ID piping is approximately 9.5 m. This diameter of piping is below the 26.6-cm-cylinder-diameter subcritical limit for 5 wt% enriched UO{sub 2}F{sub 2} solutions as given in Table 6 of ANSI/ANS-8.1. Therefore, for up to 5 wt% enriched UF{sub 6}, this piping does not present a criticality concern for either accident scenario. Calculations were performed to determine the enrichment level at which criticality could become a concern in these 8-in.-ID piping sections. Both unreflected and fully water-reflected conditions were considered.

  3. The effects of channel diameter on flow pattern, void fraction and pressure drop of two-phase air-water flow in circular micro-channels

    SciTech Connect (OSTI)

    Saisorn, Sira [Energy Division, The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand); Wongwises, Somchai [Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand)

    2010-05-15T23:59:59.000Z

    Two-phase air-water flow characteristics are experimentally investigated in horizontal circular micro-channels. Test sections are made of fused silica. The experiments are conducted based on three different inner diameters of 0.53, 0.22 and 0.15 mm with the corresponding lengths of 320, 120 and 104 mm, respectively. The test runs are done at superficial velocities of gas and liquid ranging between 0.37-42.36 and 0.005-3.04 m/s, respectively. The flow visualisation is facilitated by systems mainly including stereozoom microscope and high-speed camera. The flow regime maps developed from the observed flow patterns are presented. The void fractions are determined based on image analysis. New correlation for two-phase frictional multiplier is also proposed for practical applications. (author)

  4. Friction Factor Measurement, Analysis, and Modeling for Flat-Plates with 12.15 mm Diameter Hole-Pattern, Tested with Air at Different Clearances, Inlet Pressures, and Pressure Ratios

    E-Print Network [OSTI]

    Deva Asirvatham, Thanesh

    2011-02-22T23:59:59.000Z

    of 800, 1000, and 1200 psi respectively). These nine combinations of clearance and inlet pressure will give a range of friction factor. The following objectives are considered. 17 Figure 10. Detailed view of a 3.175 mm diameter hole...

  5. Larger Maximum Tumor Diameter at Radical Prostatectomy Is Associated With Increased Biochemical Failure, Metastasis, and Death From Prostate Cancer After Salvage Radiation for Prostate Cancer

    SciTech Connect (OSTI)

    Johnson, Skyler B.; Hamstra, Daniel A.; Jackson, William C.; Zhou, Jessica; Foster, Benjamin; Foster, Corey; Song, Yeohan; Li, Darren [Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan (United States); Palapattu, Ganesh S. [Department of Urology, University of Michigan, Ann Arbor, Michigan (United States); Kunju, Lakshmi; Mehra, Rohit [Department of Pathology, University of Michigan, Ann Arbor, Michigan (United States); Sandler, Howard [Cedars-Sinai Medical Center, Los Angeles, California (United States); Feng, Felix Y., E-mail: ffeng@med.umich.edu [Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan (United States)

    2013-10-01T23:59:59.000Z

    Purpose: To investigate the maximum tumor diameter (MTD) of the dominant prostate cancer nodule in the radical prostatectomy specimen as a prognostic factor for outcome in patients treated with salvage external beam radiation therapy (SRT) for a rising prostate-specific antigen (PSA) value after radical prostatectomy. Methods and Materials: From an institutional cohort of 575 patients treated with SRT, data on MTD were retrospectively collected. The impact of MTD on biochemical failure (BF), metastasis, and prostate cancer-specific mortality (PCSM) was assessed on univariate and multivariate analysis using Kaplan-Meier and Cox proportional hazards models. Results: In the 173 patients with MTD data available, median follow-up was 77 months (interquartile range, 47-104 months) after SRT, and median MTD was 18 mm (interquartile range, 13-22 mm). Increasing MTD correlated with increasing pT stage, Gleason score, presence of seminal vesicle invasion, and lymph node invasion. Receiver operating characteristic curve analysis identified MTD of >14 mm to be the optimal cut-point. On univariate analysis, MTD >14 mm was associated with an increased risk of BF (P=.02, hazard ratio [HR] 1.8, 95% confidence interval [CI] 1.2-2.8), metastasis (P=.002, HR 4.0, 95% CI 2.1-7.5), and PCSM (P=.02, HR 8.0, 95% CI 2.9-21.8). On multivariate analysis MTD >14 mm remained associated with increased BF (P=.02, HR 1.9, 95% CI 1.1-3.2), metastasis (P=.02, HR 3.4, 95% CI 1.2-9.2), and PCSM (P=.05, HR 9.7, 95% CI 1.0-92.4), independent of extracapsular extension, seminal vesicle invasion, positive surgical margins, pre-RT PSA value, Gleason score, and pre-RT PSA doubling time. Conclusions: For patients treated with SRT for a rising PSA value after prostatectomy, MTD at time of radical prostatectomy is independently associated with BF, metastasis, and PCSM. Maximum tumor diameter should be incorporated into clinical decision making and future clinical risk assessment tools for those patients receiving SRT.

  6. Sandia National Laboratories: National Rotor Testbed Rotor Design

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-Salt Storage System ArevaNRGAnalysisIntegrated Airfoil

  7. Effects of an acute dose of gamma radiation exposure on stem diameter growth, carbon gain, and biomass partitioning in Helianthus annuus

    SciTech Connect (OSTI)

    Thiede, M.E.

    1988-05-25T23:59:59.000Z

    Nineteen-day-old dwarf sunflower plants (Helianthus annuus, variety NK894) received a variable dose (0-40 Gy) from a cobalt-60 gamma source. A very sensitive stem monitoring device, developed at Battelle's Pacific Northwest Laboratories, Richland, Washington was used to measure real-time changes in stem diameter. Exposure of plants caused a significant reduction in stem growth and root biomass. Doses as low as 5 Gy resulted in a significant increase in leaf density, suggesting that nonreversible morphological growth changes could be induced by very low doses of radiation. Carbohydrate analysis of 40-Gy irradiated plants demonstrated significantly more starch content in leaves and significantly less starch content in stems 18 days after exposure than did control plants. In contrast, the carbohydrate content in roots of 40-Gy irradiated plants were not significantly different from unirradiated plants 18 days after exposure. These results indicate that radiation either decreased phloem transport or reduced the availability of sugar reducing enzymes in irradiated plants. 44 refs., 12 figs.

  8. Project W420 Air Sampler Probe Placement Qualification Tests for Four 6-Inch Diameter Stacks: 296-A-25, 296-B-28, 296-S-22, and 296-T-18

    SciTech Connect (OSTI)

    Maughan, A.D.; Glissmeyer, J.A.

    1998-09-30T23:59:59.000Z

    The W420 project covers the upgrading of effluent monitoring systems at six ventilation exhaust stacks in tank-farm facilities at the U.S. Department of Energy's Hanford Site. The discharge stacks of five of the six systems will be completely replaced. Four of these (296-A-25, 296-B-28, 296-S-22, and 296-T-18) will be of the same size, 6-inches in diameter and about 12-ft high. This report documents tests that were conducted to verify that these four stacks meet the applicable regulatory criteria regarding the placement of the air sampling probe. These criteria ensure that the contaminants in the stack are well mixed with the airflow at the location of the probe such that the extracted sample represents the whole. There are also criteria addressing the transport of the sample to the collection device. These are not covered in this report, but will need to be addressed later. These tests were conducted by Pacific Northwest National Laboratory on a full-scale model of the 6-inch stick. The sequence of tests addresses the acceptability of the flow angle relative to the probe and the uniformity of air velocity and gaseous and particle tracers in the cross section of the stack. All tests were successful, and all acceptance criteria were met.

  9. Sandia National Laboratories: Rotor Innovation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik SpoerkeSolarCybernetics: DynamicCybernetics: WeighBlade Sensors

  10. E-Print Network 3.0 - arc blade type Sample Search Results

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    NASA Langley Research Center Collection: Engineering 8 Sparkr Blade Test Centre Wind turbines with a rotor diameter exceed- Summary: Sparkr Blade Test Centre Wind...

  11. This issue's cover: A soil sample following crushing by a 6 cm diameter piston at 222 kN. This sample and its pristine counterpart were spiked with explosives and the explosives concentrations were monitored over

    E-Print Network [OSTI]

    Douglas, Thomas A.

    This issue's cover: A soil sample following crushing by a 6 cm diameter piston at 222 k particles. Three soils were crushed with a piston to emulate detonation- induced fracturing. X. Our results suggest soil mineralogical and geochemical compositions were not changed during piston

  12. Vortex Jitter in Hover Swathi M. Mula

    E-Print Network [OSTI]

    Tinney, Charles E.

    78712, USA Abstract The trajectory of the tip vortex of a reduced-scale, 1 m diameter, four-bladed rotor condition of the rotor is at a blade loading of CT / = 0.0645 and a rotational speed of 1240RPM wake dominated by the tip vortices shed from the rotor blades. The complexity of the flow

  13. Design and Experimental Validation of a Ducted Counter-rotating Axial-flow Fans System

    E-Print Network [OSTI]

    Boyer, Edmond

    ,8 ) than the front rotor (FR) diameter to re- duce interaction between the FR tip vortex and the RR blade that the efficiency is strongly increased compared to a conventional rotor or to a rotor-stator stage. The effects a very flexible use, with a large patch of high efficient operating points in the parameter space

  14. SCIENCE CHINA Physics, Mechanics & Astronomy

    E-Print Network [OSTI]

    Hu, Hui

    wind farms vs. ~7 rotor diameters for offshore wind farms in the prevailing wind direction), especially to turbines in onshore wind farms due to the smaller turbine spacing (i.e., ~3 rotor diameters for onshore. To achieve the goal of 20% of electricity generation from wind energy by 2030, while more and more wind farms

  15. Mixed quantum/classical theory for inelastic scattering of asymmetric-top-rotor + atom in the body-fixed reference frame and application to the H{sub 2}O + He system

    SciTech Connect (OSTI)

    Semenov, Alexander [Chemistry Department, Wehr Chemistry Building, Marquette University, Milwaukee, Wisconsin 53201-1881 (United States); PSL Research University, Observatoire de Paris, Sorbonne Universités, UPMC Univ Paris 06, ENS, UCP, CNRS, UMR8112, LERMA, 5 Place Janssen, 92195 Meudon (France); Dubernet, Marie-Lise [PSL Research University, Observatoire de Paris, Sorbonne Universités, UPMC Univ Paris 06, ENS, UCP, CNRS, UMR8112, LERMA, 5 Place Janssen, 92195 Meudon (France); Babikov, Dmitri, E-mail: dmitri.babikov@mu.edu [Chemistry Department, Wehr Chemistry Building, Marquette University, Milwaukee, Wisconsin 53201-1881 (United States)

    2014-09-21T23:59:59.000Z

    The mixed quantum/classical theory (MQCT) for inelastic molecule-atom scattering developed recently [A. Semenov and D. Babikov, J. Chem. Phys. 139, 174108 (2013)] is extended to treat a general case of an asymmetric-top-rotor molecule in the body-fixed reference frame. This complements a similar theory formulated in the space-fixed reference-frame [M. Ivanov, M.-L. Dubernet, and D. Babikov, J. Chem. Phys. 140, 134301 (2014)]. Here, the goal was to develop an approximate computationally affordable treatment of the rotationally inelastic scattering and apply it to H{sub 2}O + He. We found that MQCT is somewhat less accurate at lower scattering energies. For example, below E = 1000 cm{sup ?1} the typical errors in the values of inelastic scattering cross sections are on the order of 10%. However, at higher scattering energies MQCT method appears to be rather accurate. Thus, at scattering energies above 2000 cm{sup ?1} the errors are consistently in the range of 1%–2%, which is basically our convergence criterion with respect to the number of trajectories. At these conditions our MQCT method remains computationally affordable. We found that computational cost of the fully-coupled MQCT calculations scales as n{sup 2}, where n is the number of channels. This is more favorable than the full-quantum inelastic scattering calculations that scale as n{sup 3}. Our conclusion is that for complex systems (heavy collision partners with many internal states) and at higher scattering energies MQCT may offer significant computational advantages.

  16. Tightening procedures for large diameter anchor bolts

    E-Print Network [OSTI]

    Abraham, Ryan Charles

    1997-01-01T23:59:59.000Z

    in Snug Tight Condition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 24 24 24 Page 3. 2 3. 3 3. 1. 1. 1. 2 Preload Induced by Turning Top Nut 30 Degrees Past Snug Tight. 3. 1. 1. 1. 3 Preload Induced by Turning Top... Nut 60 Degrees Past Snug Tight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 1. 1. 2 8 UN Threads. . . . . . 3. 1. 1. 2. 1 Preload Induced in Snug Tight Condition...

  17. Large Diameter Lasing Tube Cooling Arrangement

    DOE Patents [OSTI]

    Hall, Jerome P.; Alger, Terry W.; Anderson, Andrew T.; Arnold, Philip A.

    2004-05-18T23:59:59.000Z

    A cooling structure (16) for use inside a ceramic cylindrical tube (11) of a metal vapor laser (10) to cool the plasma in the tube (11), the cooling structure (16) comprising a plurality of circular metal members (17,31) and mounting members (18, 34) that position the metal members (17,31) coaxially in the tube (11) to form an annular lasing volume, with the metal members (17, 31) being axially spaced from each other along the length of the tube (11) to prevent the metal members from shorting out the current flow through the plasma in the tube (11) and to provide spaces through which the heat from localized hot spots in the plasma may radiate to the other side of the tube (11).

  18. Measurement of turbulent wind velocities using a rotating boom apparatus

    SciTech Connect (OSTI)

    Sandborn, V.A.; Connell, J.R.

    1984-04-01T23:59:59.000Z

    The present report covers both the development of a rotating-boom facility and the evaluation of the spectral energy of the turbulence measured relative to the rotating boom. The rotating boom is composed of a helicopter blade driven through a pulley speed reducer by a variable speed motor. The boom is mounted on a semiportable tower that can be raised to provide various ratios of hub height to rotor diameter. The boom can be mounted to rotate in either the vertical or horizontal plane. Probes that measure the three components of turbulence can be mounted at any location along the radius of the boom. Special hot-film sensors measured two components of the turbulence at a point directly in front of the rotating blade. By using the probe rotated 90/sup 0/ about its axis, the third turbulent velocity component was measured. Evaluation of the spectral energy distributions for the three components of velocity indicates a large concentration of energy at the rotational frequency. At frequencies slightly below the rotational frequency, the spectral energy is greatly reduced over that measured for the nonrotating case measurements. Peaks in the energy at frequencies that are multiples of the rotation frequency were also observed. We conclude that the rotating boom apparatus is suitable and ready to be used in experiments for developing and testing sensors for rotational measurement of wind velocity from wind turbine rotors. It also can be used to accurately measure turbulent wind for testing theories of rotationally sampled wind velocity.

  19. Wind turbine having a direct-drive drivetrain

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2008-10-07T23:59:59.000Z

    A wind turbine (100) comprising an electrical generator (108) that includes a rotor assembly (112). A wind rotor (104) that includes a wind rotor hub (124) is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle (160) via a bearing assembly (180). The wind rotor hub includes an opening (244) having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity (380) inside the wind rotor hub. The spindle is attached to a turret (140) supported by a tower (136). Each of the spindle, turret and tower has an interior cavity (172, 176, 368) that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system (276) for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  20. Cell diameter measurements obtained with a handheld cell counter could be used as a surrogate marker of G2/M arrest and apoptosis in colon cancer cell lines exposed to SN-38

    SciTech Connect (OSTI)

    Tahara, Makiko [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan) [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan); Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Tochigi (Japan); Inoue, Takeshi [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan)] [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan); Miyakura, Yasuyuki; Horie, Hisanaga; Yasuda, Yoshikazu [Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Tochigi (Japan)] [Department of Gastrointestinal Surgery, Jichi Medical University, Shimotsuke, Tochigi (Japan); Fujii, Hirofumi [Division of Clinical Oncology, Jichi Medical University, Shimotsuke, Tochigi (Japan)] [Division of Clinical Oncology, Jichi Medical University, Shimotsuke, Tochigi (Japan); Kotake, Kenjiro [Department of Surgery, Tochigi Cancer Center, Utsunomiya, Tochigi (Japan)] [Department of Surgery, Tochigi Cancer Center, Utsunomiya, Tochigi (Japan); Sugano, Kokichi, E-mail: ksugano@tcc.pref.tochigi.lg.jp [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan)] [Oncogene Research Unit/Cancer Prevention Unit, Tochigi Cancer Center Research Institute, Utsunomiya, Tochigi (Japan)

    2013-05-17T23:59:59.000Z

    Highlights: •Chemo-sensitivity to SN-38 was assayed by the automated cell counter. •Colon cancer cell line, HCT116 cells were more sensitive to SN-38 than HT29 cells. •Increase of cell size reflects G2/M arrest. •Appearance of small particles indicates cell apoptosis. -- Abstract: In vitro assessment of chemosensitivity are important for experiments evaluating cancer therapies. The Scepter 2.0 cell counter, an automated handheld device based on the Coulter principle of impedance-based particle detection, enables the accurate discrimination of cell populations according to cell size and volume. In this study, the effects of SN-38, the active metabolite of irinotecan, on the colon cancer cell lines HCT116 and HT29 were evaluated using this device. The cell count data obtained with the Scepter counter were compared with those obtained with the {sup 3}H-thymidine uptake assay, which has been used to measure cell proliferation in many previous studies. In addition, we examined whether the changes in the size distributions of these cells reflected alterations in the frequency of cell cycle arrest and/or apoptosis induced by SN-38 treatment. In our experiments using the Scepter 2.0 cell counter, the cell counts were demonstrated to be accurate and reproducible measure and alterations of cell diameter reflected G2/M cell cycle arrest and apoptosis. Our data show that easy-to-use cell counting tools can be utilized to evaluate the cell-killing effects of novel treatments on cancer cells in vitro.

  1. Sandia National Laboratories: Rotor Aerodynamic Design

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Generator Modeling Radar Friendly Blades Special Programs Techno-Economic Modeling, Analysis, and Support Analysis, Modeling, Cost of Energy, and Policy Impact: Wind Vision 2014...

  2. Turbulence ingestion noise of open rotors

    E-Print Network [OSTI]

    Robison, Rosalyn Aruna Venner

    2012-04-10T23:59:59.000Z

    -Edge Interaction (TBL-TE) is a dominant noise source for wind turbines (Kamruzzaman et al., 2008), as well as being a subject of active research within aeroengine aeroacoustics (Pagano et al., 2009). Towards the trailing edge of a blade the boundary layer plays... , flight testing and calibration of methods. Hoff included a diagram which illustrated the many different propfan noise sources, see Figure 1.4. There was also a recognition that distortion is an important factor in predicting the acoustics of propeller...

  3. Methods of making wind turbine rotor blades

    DOE Patents [OSTI]

    Livingston, Jamie T. (Pensacola, FL); Burke, Arthur H. E. (Gulf Breeze, FL); Bakhuis, Jan Willem (Nijverdal, NL); Van Breugel, Sjef (Enschede, NL); Billen, Andrew (Daarlerveen, NL)

    2008-04-01T23:59:59.000Z

    A method of manufacturing a root portion of a wind turbine blade includes, in an exemplary embodiment, providing an outer layer of reinforcing fibers including at least two woven mats of reinforcing fibers, providing an inner layer of reinforcing fibers including at least two woven mats of reinforcing fibers, and positioning at least two bands of reinforcing fibers between the inner and outer layers, with each band of reinforcing fibers including at least two woven mats of reinforcing fibers. The method further includes positioning a mat of randomly arranged reinforcing fibers between each pair of adjacent bands of reinforcing fibers, introducing a polymeric resin into the root potion of the wind turbine blade, infusing the resin through the outer layer, the inner layer, each band of reinforcing fibers, and each mat of random reinforcing fibers, and curing the resin to form the root portion of the wind turbine blade.

  4. Sandia National Laboratories: SMART Rotor Video

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    * Video * Wind * wind energy Comments are closed. Renewable Energy Wind Energy Wind Plant Optimization Test Site Operations & Maintenance Safety: Test Facilities Capital Equipment...

  5. Rotor assembly including superconducting magnetic coil

    DOE Patents [OSTI]

    Snitchler, Gregory L. (Shrewsbury, MA); Gamble, Bruce B. (Wellesley, MA); Voccio, John P. (Somerville, MA)

    2003-01-01T23:59:59.000Z

    Superconducting coils and methods of manufacture include a superconductor tape wound concentrically about and disposed along an axis of the coil to define an opening having a dimension which gradually decreases, in the direction along the axis, from a first end to a second end of the coil. Each turn of the superconductor tape has a broad surface maintained substantially parallel to the axis of the coil.

  6. Aeroelastic analysis of a helicopter rotor

    E-Print Network [OSTI]

    McQuien, Larry Jay

    1977-01-01T23:59:59.000Z

    was in coalescence with the two-dimensional predicted flutter boundary, three ? dimensional theory was required. The effects of wake contraction and tip ~ortex presence were found to be negligible in comparison to that of the helical vortex sheet... are extended to Dr. Leland A. Carlson for reviewing the original manuscript for this thesis and editing it. Dr. Garison and Dr. Ralph K. Cavin also served on the advisory commit tee f or this thesis and their assistance is acknowledged. The financial...

  7. Sandia National Laboratories: functional rotor scaling

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia,evaluatingfull module characterization HelioVolt Modulesrotor

  8. Sandia National Laboratories: rotor structural verification

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbineredox-active perovskiteremoving thereverse osmosisrotor structural

  9. Sandia National Laboratories: Rotor Aerodynamic Design

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik SpoerkeSolarCybernetics: DynamicCybernetics: Weigh

  10. Sandia National Laboratories: Rotor Design Tools

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik SpoerkeSolarCybernetics: DynamicCybernetics: WeighBlade Sensors andDesign

  11. Sandia National Laboratories: SMART Rotor Video

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik SpoerkeSolarCybernetics:2P DOE-SponsoredParticipation in theEnergyWind

  12. Sandia National Laboratories: National Rotor Testbed

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-Salt Storage System ArevaNRGAnalysis

  13. aortic valve leaflet: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 245 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  14. aortic valve leaflets: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 245 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  15. aortic valve stenosis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 233 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  16. Ris-R-1415(EN) Wake Effects on Middelgrund

    E-Print Network [OSTI]

    caused by the interaction between the turbines and the flow. Finally the turbines are spaced by 2.6 rotor than 5 rotor diameters. Taking all this assumptions and model constraints into account the Park model-550-3227-3 ISBN 87-550-3228-1 (Internet) ISSN 0106-2840 Print: Pitney Bowes Management Services, Denmark A/S, 2003

  17. A NUMERICAL AND EXPERIMENTAL STUDY OF WINDBACK SEALS

    E-Print Network [OSTI]

    Lim, Chae H.

    2010-01-16T23:59:59.000Z

    performance and the flow field inside the seal. The leakage flow rate increases with increasing the pressure differential, rotor speed, radial clearance, cavity size, and shaft diameter and with decreasing the tooth width. The eccentricity has a minimal effect...

  18. Energy deposition in the body from external sources to chemically trigger cellular responses in desired localized regions

    E-Print Network [OSTI]

    Ibsen, Stuart Duncan

    2011-01-01T23:59:59.000Z

    blast region was not centered at the smaller microbubble because only the effectthe blast region measures at 49 µm in diameter. The effectblast region and measures at 12 µm in diameter. Discussion The effect

  19. Distributed estimation of diameter, radius and eccentricities in anonymous networks

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    properties of being fully distributed, parallel and scalable. We analytically characterize the statistics of the network by maintaining a certain efficiency in communicating using less energy (Chen et al., 2002 to these results has received funding from the European Union Seventh Framework Programme [FP7/2007-2013] under

  20. Method of making tapered capillary tips with constant inner diameters

    DOE Patents [OSTI]

    Kelly, Ryan T. (West Richland, WA); Page, Jason S. (Kennewick, WA); Tang, Keqi (Richland, WA); Smith, Richard D. (Richland, WA)

    2009-02-17T23:59:59.000Z

    Methods of forming electrospray ionization emitter tips are disclosed herein. In one embodiment, an end portion of a capillary tube can be immersed into an etchant, wherein the etchant forms a concave meniscus on the outer surface of the capillary. Variable etching rates in the meniscus can cause an external taper to form. While etching the outer surface of the capillary wall, a fluid can be flowed through the interior of the capillary tube. Etching continues until the immersed portion of the capillary tube is completely etched away.

  1. Drill wear: its effect on the diameter of drilled holes

    E-Print Network [OSTI]

    Reichert, William Frederick

    1955-01-01T23:59:59.000Z

    genoa arrrZgg zo gaamWra gHZ. zo ZaaXm axz:gVm VZXgg DRILL WEhR: ITS EFFECT ON THE DlhEETER GF DRILLED HOLES h Thesis Villian Frederick Reiehert, Jr. hpproved as to style and oontent by: a rman o onn ee ea o par nen hugus t 1955 h.... I RTRONCTIOE ~ ~ ~ ~ ~ ~ e s ~ o e o o o ~ N I I DRILLS AND DRXLLXNG ~ ~ ~ ~ ~ o e ~ o ~ ~ Twist Drills Drill Presses Cutting Fluids . . . ~ Drill Pigs IIX DESCRIPTXOM OF EQUIPRERT AND PROCEXlIRE 6 13 19 23 27 Drilliag Eguipeeat...

  2. austenitic small diameter: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    trees of mixed softwood species. These forests have a potential for large-scale insect infestations Abubakr, Said 17 First-principles Study of Physisorption of...

  3. Direct Probes of 4 nm Diameter Gold Nanoparticles Interacting...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    their alkyl chains when NaCl concentration is raised from 0.001 to 0.1 M. From second harmonic generation (SHG) measurements we estimate that each zwitterionic headgroup of the...

  4. Reducing pressure loss of large diameter check valves

    SciTech Connect (OSTI)

    NONE

    1997-09-01T23:59:59.000Z

    Transcend Inc., a consulting firm that specializes in the use of computer simulation to optimize existing equipment and system designs, was approached by Mannesmann Demag AG, Moenchengladbach, Germany to optimize the design of its DRV-B check valve. In one of the first applications of Computational Fluid Dynamics (CFD) technology to valve design, the pressure loss coefficient (K) of the DRV-B valve was lowered to 0.40--0.50 for valve sizes NPS48--NPS12, the lowest possible level for this type of valve. The flow efficiency is three times better than that of the earlier design. As a result, the optimized Mannesmann Demag DRV-B check valve provides a dramatic reduction in operating cost, particularly in transmission service where natural gas is transported over long distances. The reduced pressure loss saves compressor fuel cost. For the optimized valve, the incremental compressor fuel cost is reduced to 1.5-times the capital cost of the valve calculated over a 20-year Life Cycle Cost (LCC) period.

  5. angular diameter stars: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    R Dor is shown to be closely related to the Mira variables. We estimate an effective temperature of 2740 +- 190 K, a distance of 61 +- 7 pc, a luminosity of 6500 +- 1400 Lsol...

  6. Periodic Holes with 10 nm Diameter Produced by Grazing Ar+

    E-Print Network [OSTI]

    Metzger, Robert M.

    on the surface of a saturated mercury dichloride (HgCl2) solution, with the aluminum metal side on the bottom acid solution at 40 V at 5 °C for at least 1 day.10,11 A homogeneous U-shaped barrier oxide layer, 20PO4 mixed etching solution at 60 °C for 3 h, to remove the initial Al2O3 layer and leave an ordered

  7. Direct Probes of 4 nm Diameter Gold Nanoparticles Interacting with

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation Proposed Newcatalyst phasesDataTranslocation of Shewanella Oneidensisthe

  8. Approximating the Diameter of Planar Graphs in Near Linear Time

    E-Print Network [OSTI]

    Yuster, Raphael

    common starting vertex. Let Gin (resp. Gout) be the subgraph of G induced by C and all interior (resp. exterior) vertices to C. Let d(Gin, Gout, G) denote the largest distance in the graph G between a marked vertex in V (Gin) and a marked vertex in V (Gout). In the beginning, all vertices of G are marked and we

  9. Diameter-Refined Metallic Carbon Nanotubes as Optically Tunable Transparent

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsruc DocumentationP-Series to UserProduct: CrudeOfficeNERSC Helps Develop Di-Jia LiuConductors |

  10. Determination of torsional fatigue life of large turbine generator shafts. Final report

    SciTech Connect (OSTI)

    Placek, R.J.; Williams, R.A.; Adams, S.L.; Klufas, O.

    1984-04-01T23:59:59.000Z

    This report presents the results of a study to develop a methodology for predicting torsional fatigue damage to a turbine generator rotor subjected to transient electrical disturbances. This methodology used torsional properties obtained from constant amplitude tests on one-inch diameter specimens. The predictions were verified with constant amplitude and variable amplitude tests of specimens up to six inches in diameter.

  11. K. McDonald Princeton U.

    E-Print Network [OSTI]

    McDonald, Kirk

    called gun drilling. In this the lubrication is provided by high­pressure oil that flows through in hole diameter. The lubricating oil in a small­diameter bit needs to be at a pressure in excess of 1 a `pecking' cycle with the drill bit lubricated by a spray mist, followed by a ream to set the final diameter

  12. Magnetism and Mott transition: A slave-rotor study

    E-Print Network [OSTI]

    Ko, Wing Ho

    Motivated by the debate of the spin-density-wave (SDW) versus local-moment (LM) picture in the iron-based superconducting (FeSC) materials, we consider a two-band orbital-symmetric Hubbard model in which there is robust ...

  13. SMART Wind Turbine Rotor: Data Analysis and Conclusions

    Broader source: Energy.gov [DOE]

    This report documents the data post-processing and analysis performed to date on the field test data.

  14. DOE and Sandia National Laboratories Develop National Rotor Testbed...

    Energy Savers [EERE]

    The SWiFT facility, which was commissioned this July, is unique in that it utilizes wind turbines that are large enough to represent the physics relevant to utility-scale machines,...

  15. Field Testing of a Quad Rotor Smartphone Control System

    E-Print Network [OSTI]

    Cummings, M.L.

    2012-01-01T23:59:59.000Z

    With recent regulatory efforts to reduce restrictions placed on the operation of Micro Air Vehicles (MAVs) in the United States, it is likely that in the next few years, these vehicles will become commonplace in the ...

  16. Substantially Parallel Flux Uncluttered Rotor Machines (U-Machine)

    Energy Innovation Portal (Marketing Summaries) [EERE]

    2010-02-03T23:59:59.000Z

    A general concern based on the supply and demand trend of the permanent magnet (PM) raw materials suggests the need for elimination of these materials from electric motors (and generators) to control future costs. This invention discloses a new motor topology that eliminates the PM. Other innovations include brushless adjustable field excitation for high starting torque, field weakening, and power factor improvement and novel locks for higher peak speed. This novel machine shows promising...

  17. A Design Study ofa 1MW Stall Regulated Rotor

    E-Print Network [OSTI]

    of special tailored airfoils has been found to be around 4% on the annual energy production and 1 55 4.8 Summary 56 5 Comparison with LM 24.0 59 5.1 Assumptions 59 5.2 Geometry 60 5.3 Annual energy production and loads 62 5.4 Materia

  18. PALIERS POUR ROTORS TOURNANT A GRANDE VITESSE Par G. GOBERT,

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    l'air comprimé comme gaz. Le principe consiste à sépa- rer, par un film gazeux, un plan mobile d atmosphérique aux abords du gicleur, due soit à un écoulement où la vitesse du gaz atteint la célérité locale du turbine (poids = 27 g). ~ b = butée : 4 gicleurs 0 1 mm sur 0 20 mm. 4 gicleurs 0 1 mm sur 0 34 mm. Modèle

  19. MHK Technologies/Wave Rotor | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat JumpIncMAKGalway Bay IEOWCCatcher.png TechnologyRoller < MHKRotor <

  20. DOE and Sandia National Laboratories Develop National Rotor Testbed |

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarly Career Scientists'Montana. DOCUMENTSof EnergyAllianceDepartment of

  1. Bore tube assembly for steam cooling a turbine rotor

    DOE Patents [OSTI]

    DeStefano, Thomas Daniel (Ballston Lake, NY); Wilson, Ian David (Clifton Park, NY)

    2002-01-01T23:59:59.000Z

    An axial bore tube assembly for a turbine is provided to supply cooling steam to hot gas components of the turbine wheels and return the spent cooling steam. A pair of inner and outer tubes define a steam supply passage concentric about an inner return passage. The forward ends of the tubes communicate with an end cap assembly having sets of peripheral holes communicating with first and second sets of radial tubes whereby cooling steam from the concentric passage is supplied through the end cap holes to radial tubes for cooling the buckets and return steam from the buckets is provided through the second set of radial tubes through a second set of openings of the end cap into the coaxial return passage. A radial-to-axial flow transitioning device, including anti-swirling vanes is provided in the end cap. A strut ring adjacent the aft end of the bore tube assembly permits axial and radial thermal expansion of the inner tube relative to the outer tube.

  2. Sandia National Laboratories: capture more wind with longer rotors

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1development Sandia, NREL Release Wavearc-faultbest paperbiomarineblendingthe

  3. Sandia National Laboratories: increasing average wind-turbine rotor

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbine blade manufacturing the viability offuelincreaseddiameter

  4. Sandia National Laboratories: wind-turbine rotor design

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administrationcontroller systems controller systems Scaled Windwhite LEDwind turbines

  5. Sandia National Laboratories: Rotor Blade Sensors and Instrumentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik SpoerkeSolarCybernetics: DynamicCybernetics: WeighBlade Sensors and

  6. Sandia National Laboratories: Structural and Mechanical Adaptive Rotor

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErikGroundbreakingStandards Solar ThermochemicalStorage

  7. SMART Wind Turbine Rotor: Data Analysis and Conclusions | Department of

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l LPROJECTS IN7 Roadmap forDKT.Awards and IncentivesSHARPofofSMART

  8. Sandia National Laboratories: National Rotor Testbed Functional Scaling

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive SolarEducationStation TechnologyWindInternationalbyNRELPresented at

  9. Substantially Parallel Flux Uncluttered Rotor Machines (U-Machine) - Energy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security AdministrationcontrollerNanocrystalline Gallium Oxide ThinIon Cooling andStudyingSubstantial

  10. Sandia National Laboratories: Rotor Blade Sensors and Instrumentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    capture all of the force applied to the entire wind-turbine system. A turbine's exact wind loading is fundamental to overall system design. Due to the large potential for...

  11. Characteristics of a multiple disk pump with turbulent rotor flow

    E-Print Network [OSTI]

    Roddy, Patrick James

    1985-01-01T23:59:59.000Z

    DIRHETER IINIt tl, DISCHARGE OIANETER IINlt 3. CLEARANCE OETHEEN DISKS 0. 13636 IN. TYPE SEALJ PRCKING DISKFLO PUHP; NODEL K03 TOTRL HERO HORSEPOHER X EFFICIENCY + NPSH AVAIL V Figure 12. Performance of the 11 Disk Pump at 890 rpm (Test 2) C& C...: D. 13636 IN 111'E 5EAI. PACK(NO OISKFLD PL'. "P: HDD L 40 TOTAL HERO HDRSEPOHER X EFFICIENCY + NPSH AVAIL Y Figure 14 . Performance of the 1 1 Disk Pump at 1 790 rpm ( Tes t 1 ) CV o O C) CI O C) O \\ C CC C O I-!-W I o O O O 6 )3...

  12. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@inp-toulouse.fr

    E-Print Network [OSTI]

    Mailhes, Corinne

    - ments inserted in a pipe, column or reactor. They redistribute the fluid in directions transverse the resulting Sauter mean diameters. The comparison between residence time in the mixer and surfactants

  13. Study of the mechanical behaviour of a macroscopic glasspolyester composite by ESPI method and numerical simulations

    E-Print Network [OSTI]

    Corigliano, Alberto

    investigation concerning the mechanical behaviour of macromodels for fibre-reinforced composites. Cubic; the specimens have a 30 mm long side and the fibres a 2 mm long diameter. The displacement field on the surface

  14. Invariant mechanical properties of calcium-silicate-hydrates (C-H-S) in cement-based materials : instrumented nanoindentation and microporomechanical modeling

    E-Print Network [OSTI]

    Constantinides, Georgios, 1978-

    2006-01-01T23:59:59.000Z

    Random porous solids such as bone and geomaterials exhibit a multiphase composite nature, characterized by water-filled pores of nm- to m-scale diameter. The natural synthesis and operating environments of such materials ...

  15. Heat flux limiting sleeves

    DOE Patents [OSTI]

    Harris, William G. (Tampa, FL)

    1985-01-01T23:59:59.000Z

    A heat limiting tubular sleeve extending over only a portion of a tube having a generally uniform outside diameter, the sleeve being open on both ends, having one end thereof larger in diameter than the other end thereof and having a wall thickness which decreases in the same direction as the diameter of the sleeve decreases so that the heat transfer through the sleeve and tube is less adjacent the large diameter end of the sleeve than adjacent the other end thereof.

  16. Quantifying the Impact of Wind Turbine Wakes on Power Output at Offshore R. J. BARTHELMIE,*,1 S. C. PRYOR,*,1 S. T. FRANDSEN,1 K. S. HANSEN,# J. G. SCHEPERS,@

    E-Print Network [OSTI]

    Pryor, Sara C.

    Quantifying the Impact of Wind Turbine Wakes on Power Output at Offshore Wind Farms R. J. This research is focused on improving the understanding of, and modeling of, wind turbine wakes in order to make. Differences in turbine spacing (10.5 versus 7 rotor diameters) are not differentiable in wake-related power

  17. Cost of Wind Energy in the United States: Trends from 2007 to 2012 (Presentation)

    SciTech Connect (OSTI)

    Hand, M.

    2015-01-01T23:59:59.000Z

    This presentation provides an overview of recent technology trends observed in the United States including project size, turbine size, rotor diameter, hub height, annual average wind speed, and annual energy production. It also highlights area where system analysis is required to fully understand how these technology trends relate to the cost of wind energy.

  18. Journal of Wind Engineering and Industrial Aerodynamics 96 (2008) 503523

    E-Print Network [OSTI]

    Manuel, Lance

    with such spectral models can be in turn highly variable for different realizations. Turbine load and performance a wind velocity field over spatial dimensions on the scale of the turbine rotor diameter in accordance of uncertainty in inflow turbulence to wind turbine loads Korn Saranyasoontorn, Lance ManuelÃ? Department of Civil

  19. closed channel a 3L /a % h d "P a #h,:* A

    E-Print Network [OSTI]

    Huang, Haimei

    layer approximation and explain the reason of the answer. (5 points) 5. A circular ice rink is 25 m in diameter and is to be temporarily enclosed in a hemispherical dome of the' same diameter. The ice the radiant heat transfer from the dome to the rink if both surfaces can be taken as black. (10%) ocean open

  20. K. McDonald Princeton U.

    E-Print Network [OSTI]

    McDonald, Kirk

    called gun drilling. In this the lubrication is provided by high-pressure oil that flows through). In principle, use of a single, resharpened tool would minimize variation in hole diameter. The lubricating oil a `pecking' cycle with the drill bit lubricated by a spray mist, followed by a ream to set the final diameter

  1. Quantum dot-based nanomaterials for biological imaging

    E-Print Network [OSTI]

    Zimmer, John P. (John Philip)

    2006-01-01T23:59:59.000Z

    Quantum dot-based fluorescent probes were synthesized and applied to biological imaging in two distinct size regimes: (1) 100-1000 nm and (2) < 10 nm in diameter. The larger diameter range was accessed by doping CdSe/ZnS ...

  2. A study of production/injection data from slim holes and production wells at the Oguni Geothermal Field, Japan

    SciTech Connect (OSTI)

    Garg, S.K.; Combs, J.; Abe, M.

    1996-03-01T23:59:59.000Z

    Production and injection data from slim holes and large-diameter wells at the Oguni Geothermal Field, Japan, were examined in an effort to establish relationships (1) between productivity of large-diameter wells and slim holes, (2) between injectivity and productivity indices and (3) between productivity index and borehole diameter. The production data from Oguni boreholes imply that the mass production from large-diameter wells may be estimated based on data from slim holes. Test data from both large- and small-diameter boreholes indicate that to first order the productivity and the injectivity indices are equal. Somewhat surprisingly, the productivity index was found to be a strong function of borehole diameter; the cause for this phenomenon is not understood at this time.

  3. Fabrication of small-orifice fuel injectors for diesel engines.

    SciTech Connect (OSTI)

    Woodford, J. B.; Fenske, G. R.

    2005-04-08T23:59:59.000Z

    Diesel fuel injector nozzles with spray hole diameters of 50-75 {micro}m have been fabricated via electroless nickel plating of conventionally made nozzles. Thick layers of nickel are deposited onto the orifice interior surfaces, reducing the diameter from {approx}200 {micro}m to the target diameter. The nickel plate is hard, smooth, and adherent, and covers the orifice interior surfaces uniformly.

  4. Mixer-Ejector Wind Turbine: Breakthrough High Efficiency Shrouded Wind Turbine

    SciTech Connect (OSTI)

    None

    2010-02-22T23:59:59.000Z

    Broad Funding Opportunity Announcement Project: FloDesign Wind Turbine’s innovative wind turbine, inspired by the design of jet engines, could deliver 300% more power than existing wind turbines of the same rotor diameter by extracting more energy over a larger area. FloDesign Wind Turbine’s unique shrouded design expands the wind capture area, and the mixing vortex downstream allows more energy to flow through the rotor without stalling the turbine. The unique rotor and shrouded design also provide significant opportunity for mass production and simplified assembly, enabling mid-scale turbines (approximately 100 kW) to produce power at a cost that is comparable to larger-scale conventional turbines.

  5. CONSTRUCTION AND TESTING OF THE TWO METER DIAMETER TPC THIN SUPERCONDUCTING SOLENOID

    E-Print Network [OSTI]

    Green, M.A.

    2010-01-01T23:59:59.000Z

    cryostat which is cast ir epoxy resin (see Figure 1 ) . Thewas vacuum impregnated in epoxy resin- The cast ultra pure3 shows the with epoxy resin to form a rigid integrated

  6. Measurement of emission diameter as a function of time on foam z- pinch plasmas

    SciTech Connect (OSTI)

    Lazier, S.E.; Barber, T.L. [Ktech Corp., Albuquerque, NM (United States); Derzon, M.S.; Kellogg, J.W.

    1996-05-14T23:59:59.000Z

    We have developed a streaked imaging capability to make time-resolved measurements of the emission size for low density foam z-pinches. By lens coupling visible emission from the z-pinch target to an array of fiber optics we obtained the emission profile in the visible as a function of time with radial resolution of 300 {mu}m. To measure the emission at temperatures greater than {approx}40 eV the source was slit-imaged or pin-hole imaged onto an x-ray filtered scintillator. Non-uniformities in both visible and x-ray emission were observed. We describe the diagnostics, the image unfold process, and results from the instrument for both visible and x-ray measurements.

  7. Strain-Based Design Methodology of Large Diameter Grade X80 Linepipe

    SciTech Connect (OSTI)

    Lower, Mark D. [ORNL] [ORNL

    2014-04-01T23:59:59.000Z

    Continuous growth in energy demand is driving oil and natural gas production to areas that are often located far from major markets where the terrain is prone to earthquakes, landslides, and other types of ground motion. Transmission pipelines that cross this type of terrain can experience large longitudinal strains and plastic circumferential elongation as the pipeline experiences alignment changes resulting from differential ground movement. Such displacements can potentially impact pipeline safety by adversely affecting structural capacity and leak tight integrity of the linepipe steel. Planning for new long-distance transmission pipelines usually involves consideration of higher strength linepipe steels because their use allows pipeline operators to reduce the overall cost of pipeline construction and increase pipeline throughput by increasing the operating pressure. The design trend for new pipelines in areas prone to ground movement has evolved over the last 10 years from a stress-based design approach to a strain-based design (SBD) approach to further realize the cost benefits from using higher strength linepipe steels. This report presents an overview of SBD for pipelines subjected to large longitudinal strain and high internal pressure with emphasis on the tensile strain capacity of high-strength microalloyed linepipe steel. The technical basis for this report involved engineering analysis and examination of the mechanical behavior of Grade X80 linepipe steel in both the longitudinal and circumferential directions. Testing was conducted to assess effects on material processing including as-rolled, expanded, and heat treatment processing intended to simulate coating application. Elastic-plastic and low-cycle fatigue analyses were also performed with varying internal pressures. Proposed SBD models discussed in this report are based on classical plasticity theory and account for material anisotropy, triaxial strain, and microstructural damage effects developed from test data. The results are intended to enhance SBD and analysis methods for producing safe and cost effective pipelines capable of accommodating large plastic strains in seismically active arctic areas.

  8. Fabrication and electrical characterization of polyaniline-based nanofibers with diameter below 30 nm

    E-Print Network [OSTI]

    Hone, James

    fabrication with the possibility of large-scale production of meters-long fibers for incorporation into smart

  9. Calibration of a Neutron Hydroprobe for Moisture Measurements in Small-Diameter Steel-Cased Boreholes

    SciTech Connect (OSTI)

    Ward, Anderson L.; Wittman, Richard S.

    2009-08-01T23:59:59.000Z

    Computation of soil moisture content from thermalized neutron counts for the T-Farm Interim cover requires a calibration relationship but none exists for 2-in tubes. A number of calibration options are available for the neutron probe, including vendor calibration, field calibration, but none of these methods were deemed appropriate for the configuration of interest. The objective of this work was to develop a calibration relation for converting neutron counts measured in 2-in access tubes to soil water content. The calibration method chosen for this study was a computational approach using the Monte Carlo N-Particle Transport Code (MCNP). Model calibration was performed using field measurements in the Hanford calibration models with 6-in access tubes, in air and in the probe shield. The bet-fit model relating known water content to measured neutron counts was an exponential model that was essentially equivalent to that currently being used for 6-in steel cased wells. The MCNP simulations successfully predicted the neutron count rate for the neutron shield and the three calibration models for which data were collected in the field. However, predictions for air were about 65% lower than the measured counts . This discrepancy can be attributed to uncertainties in the configuration used for the air measurements. MCNP-simulated counts for the physical models were essentially equal to the measured counts with values. Accurate prediction of the response in 6-in casings in the three calibration models was motivation to predict the response in 2-in access tubes. Simulations were performed for six of the seven calibration models as well as 4 virtual models with the entire set covering a moisture range of 0 to 40%. Predicted counts for the calibration models with 2-in access tubes were 40 to 50% higher than in the 6-inch tubes. Predicted counts for water were about 60% higher in the 2-in tube than in the 6-in tube. The discrepancy between the 2-in and 6-in tube can be attributed to the smaller air gap between the probe and the 2-in access tube. The best-fit model relating volumetric water content to count ratio (CR) is of the form e^A x CR^B with A=0.3596 ± 0.0216 and B=0.4629 ± 0.0629 and r^2= 0.9998. It is recommended that the calibration function based on the count ratio, rather than raw counts, be used to avoid the effects of electronic noise in the probe that may arise due to the conditions at the time of measurement. These results suggest that the MCNP code can be used to extend calibrations for the neutron probe to different conditions including access tube size as well as composition without the need to construct additional physical models.

  10. What we know about the Sun Angular Diameter = 32 arcmin (from observations)

    E-Print Network [OSTI]

    Walter, Frederick M.

    Center (SDAC): http://umbra.nascom.nasa.gov/ includes links to SOHO, SDO, HINODE, and YOHKOH Other Solar

  11. Using image processing to measure tree crown diameters and estimate percent crown closure

    E-Print Network [OSTI]

    Gabriel, Darren Kyle

    2012-06-07T23:59:59.000Z

    . 92 15739. 78 12458. 89 14827. 1D 34621. 61 29827. 54 31822. 85 2'l709. 21 17220. 59 16172. 18 16078. 61 15824. 26 28936. 74 26003. 63 26839. 35 24482. 40 16616. 60 15824. 26 26422. 72 zszee. es 14828. 65 14340. 70 23922. 95 22465. 35...

  12. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2003-06-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast-iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and attaching a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service (which results in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1-Program Management was previously completed. Two reports, one describing the program management plan and the other consisting of the technology assessment, were submitted to the DOE COR in the first quarter. Task 2-Establishment of Detailed Design Specifications and Task 3-Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves are now well underway. First-quarter activities included conducting detailed analyses to determine the capabilities of coiled-tubing locomotion for entering and repairing gas mains and the first design iteration of the joint-sealing sleeve. The maximum horizontal reach of coiled tubing inside a pipeline before buckling prevents further access was calculated for a wide range of coiled-tubing string designs and pipe environments. Work conducted in the second quarter consisted of: (1) selecting a preferred pan/zoom/tilt camera; (2) initiating design of the digital control electronics and switching power supply for the control and operation of the in-pipe robotic modules; (3) continuing design of the repair sleeve and (4) initial testing of the wall-cleaning device. Activities in the third quarter included: (1) development of the system's pan/zoom/tilt camera control electronics and operating software, and implementing these in the surface and downhole modules and (2) further testing of the wall-cleaning elements used to clean the inside of the bell and spigot joints. Most recently, fourth quarter developments were centered on designing and testing the pipe-wall cleaning device including the selection of the drive motor and its control electronics. In addition, efforts were also focused on the design of the repair sleeve. Details of these activities are described in the body of the report along with a summary of events scheduled for the next quarter.

  13. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2003-01-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. The bell-and-spigot joints tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple cast-iron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs while the pipe remains in service by traveling through the pipe, cleaning each joint surface, and attaching a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, avoid traffic disruption, and eliminate any requirement to interrupt service (which results in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct repair operations on live mains. The development effort is divided into eleven tasks. Task 1--Program Management was previously completed. Two reports, one describing the program management plan and the other consisting of the technology assessment, were submitted to the DOE COR in the first quarter. Task 2--Establishment of Detailed Design Specifications and Task 3--Design and Fabricate Ratcheting Stainless-Steel Repair Sleeves are now well underway. First-quarter activities included conducting detailed analyses to determine the capabilities of coiled-tubing locomotion for entering and repairing gas mains and the first design iteration of the joint-sealing sleeve. The maximum horizontal reach of coiled tubing inside a pipeline before buckling prevents further access was calculated for a wide range of coiled-tubing string designs and pipe environments. Work conducted in the second quarter consisted of: (1) selecting a preferred pan/zoom/tilt camera; (2) initiating design of the digital control electronics and switching power supply for the control and operation of the in-pipe robotic modules; (3) continuing design of the repair sleeve and (4) initial testing of the wall-cleaning device. Most recently, activities in the third quarter included: (1) development of the system's pan/zoom/tilt camera control electronics and operating software, and implementing these in the surface and downhole modules and (2) further testing of the wall-cleaning elements used to clean the inside of the bell and spigot joints. Details of these activities are described in the body of the report along with a summary of events scheduled for the fourth quarter.

  14. The effects of inlet velocity and barrel diameter on cyclone performance

    E-Print Network [OSTI]

    Faulkner, William Brock

    2006-08-16T23:59:59.000Z

    geometric proportions. The Texas A&M Cyclone Design (TCD) method is a simple method for designing cyclones based on an inlet design velocity. The TCD method specifies �ideal� inlet velocities of 975 ± 120 m/min (3200 ± 400 fpm) and 914 ± 120 m/min (3000...

  15. SEALING LARGE-DIAMETER CAST-IRON PIPE JOINTS UNDER LIVE CONDITIONS

    SciTech Connect (OSTI)

    Kiran M. Kothari; Gerard T. Pittard

    2005-07-01T23:59:59.000Z

    Utilities in the U.S. operate over 75,000 km (47,000 miles) of old cast-iron pipes for gas distribution. Bell-and-spigot joints that connect pipe sections together tend to leak as these pipes age. Current repair practices are costly and highly disruptive. The objective of this program is to design, test and commercialize a robotic system capable of sealing multiple castiron bell and spigot joints from a single pipe entry point. The proposed system will perform repairs with the pipe in service by traveling through the pipe, cleaning each joint surface, and installing a stainless-steel sleeve lined with an epoxy-impregnated felt across the joint. This approach will save considerable time and labor, minimize excavation, avoid traffic disruption, and eliminate any requirement to interrupt service to customers (which would result in enormous expense to utilities). Technical challenges include: (1) repair sleeves must compensate for diametric variation and eccentricity of old cast-iron pipes; (2) the assembly must travel long distances through pipes containing debris; (3) the pipe wall must be effectively cleaned in the immediate area of the joint to assure good bonding of the sleeve; and (4) an innovative bolt-on entry fitting is required to conduct safe repair operations on live mains.

  16. Modeling Diameter Distributions of Poly (N-isopropylacrylamide-co-methacrylic Acid) Nanoparticles

    E-Print Network [OSTI]

    Cao, Quang V.

    Quang Cao, Peng Tian, Qinglin Wu School of Renewable Natural Resources, Louisiana State University Ag of 0.05 and 0.10 showed trends similar to those displayed in the observed data. VVC 2008 Wiley- tributions of gas-evaporated nanoparticles.21,22 Most of these models are based on coagulation theory

  17. ORNL devises recipe to fine-tune diameter of silica rods | ornl...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    the stage for advances in anti-reflective solar cells, computer monitors, TV screens, eye glasses and more. The goal of fabricating fixed-size one-dimensional silica structures...

  18. a 3.37 mm length b 3.32 mm diameter

    E-Print Network [OSTI]

    Marc, Robert E.

    5.2 ml retinal subtense 300 µm/deg retinal arc 51 mm retinal area* 1024 ± 184 mm2 total.3 µl retinal subtense 31 µm/deg retinal arc 4.9 mm retinal area 15.6 mm2 cone:rod ratio 0/deg retinal arc 10.6 mm retinal area 52 mm2 cone:rod ratio mean cone density* mm-2 mean rod

  19. An improved Kalai-Kleitman bound for the diameter of a polyhedron

    E-Print Network [OSTI]

    2014-03-19T23:59:59.000Z

    Mar 19, 2014 ... of polyhedra and related set systems. Santos [14] found a counterexample to the Hirsch. ?School of Operations Research and Information Engineering, Cornell University, Ithaca, .... ume: Optimization Stories (2012), 75–85. 4.

  20. Three-Dimensional Self-Assembly of Metallic Rods with Submicron Diameters Using Magnetic Interactions

    E-Print Network [OSTI]

    Prentiss, Mara

    by electrodeposition, following techniques developed by Martin6 and Mallouk,7 is a convenient method for generating to contain two ferromagnetic sections (nickel) separated by diamagnetic sections (gold) (Figure 1a of alternating layers of gold and nickel were deposited in porous alumina filters and released by dissolving

  1. Development length of three-eights inch diameter, seven-wire concrete prestressing cable

    E-Print Network [OSTI]

    George, Jimmy Donnell

    1968-01-01T23:59:59.000Z

    trar sfcr len?th& b&u'L it shou1c. no v be used f or c csi+ linc?conor c I c Blc mi&er s in v hich 'I ran, ? fe &" lc&x', I h is c emtical, 1'he above &eo?LLoned eouatio?s ~?ive on1y apozoxirz&te ind. i. cat:i ons of nec:e &sary trarcsfer ic:n ~ Lh...

  2. Designing Energy-Efficient Low-Diameter On-chip Networks with Equalized Interconnects

    E-Print Network [OSTI]

    Joshi, Ajay J.

    In a power and area constrained multicore system, the on-chip communication network needs to be carefully designed to maximize the system performance and programmer productivity while minimizing energy and area. In this ...

  3. Hydraulics of a finite-diameter horizontal well with wellbore storage and skin effect

    E-Print Network [OSTI]

    Zhan, Hongbin

    *, Hongbin Zhan Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843

  4. Non-intrusive ultrasonic liquid-in-line detector for small diameter tubes. [Patent application

    DOE Patents [OSTI]

    Piper, T.C.

    1980-09-24T23:59:59.000Z

    An arrangement for detecting liquids in a line, using non-intrusive ultrasonic techniques is disclosed. In this arrangement, four piezoelectric crystals are arranged in pairs about a 0.078 inch o.d. pipe. An ultrasonic tone burst is transmitted along the pipe, between crystal pairs, and the amplitude of the received tone burst indicates the absence/presence of liquid in the pipe.

  5. Submicron-diameter semiconductor pillar microcavities with very high quality factors

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    dimensions of space, through Bragg reflection in the longi- tudinal direction and through total internalAs/AlGaAs Bragg mirrors, surrounding the cavity spacer, are corrugated because of partial oxidation of the Al

  6. Diameter-Controlled and Nitrogen-Doped Vertically Aligned Single-Walled Carbon Theerapol Thurakitsereea

    E-Print Network [OSTI]

    Maruyama, Shigeo

    controlled and vertically aligned single-walled carbon nanotubes were synthesized from pure and mixed ethanol/acetonitrile feedstock. With increasing acetonitrile concentration in the feedstock, nitrogen incorporation into the sp2], methane [8], acetylene [9], ethylene [10], or other organic chemical sources [11]. Acetonitrile (CH3CN

  7. E-Print Network 3.0 - abdominal aortic diameter Sample Search...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    patients with an abdominal aortic aneurysm... . Priaux (Eds) TU Delft, Delft The Netherland, 2006 THE INFLUENCE OF ASYMMETRIC INFLOW IN ABDOMINAL AORTIC... the excess volume of...

  8. Operating the LCLS Gas Attenuator and Gas Detector System with Apertures of 6mm Diameter

    SciTech Connect (OSTI)

    Ryutov, D.D.; Bionta, R.M.; Hau-Riege, S.P.; Kishiyama, K.I.; Roeben, M.D.; Shen, S.; /LLNL, Livermore; Stefan, P.M.; /SLAC; ,

    2010-11-17T23:59:59.000Z

    The possibility of increasing the apertures of the LCLS gas attenuator/gas detector system is considered. It is shown that increase of the apertures from 3 to 6 mm, together with 4-fold reduction of the operation pressure does not adversely affect the vacuum conditions upstream or downstream. No change of the pump speed and the lengths of the differential pumping cells is required. One minor modification is the use of 1.5 cm long tubular apertures in the end cells of the differential pumping system. Reduction of the pressure does not affect performance of the gas attenuator/gas detector system at the FEL energies below, roughly, 2 keV. Some minor performance degradation occurs at higher energies.

  9. Forced-convection surface-boiling heat transfer and burnout in tubes of small diameters

    E-Print Network [OSTI]

    Bergles A. E.

    1962-01-01T23:59:59.000Z

    A basic heat-transfer apparatus was designed and constructed for the study of forced-convection boiling in small channels. The various regions of forced-convection surface boiling were studied experimentally and analytically. ...

  10. Bolted Joints Disassembly: A Field Study for Thermal Influence on Large Diameters

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    on bolts exposed to corrosive atmospheres or used in petrochemical plant [3, 4]. Thus, the main damages or studs. Bolts and studs used for assembly in petrochemical industries are usually made of alloyed steel

  11. DISCOVERY OF THE SMALL-DIAMETER, YOUNG SUPERNOVA REMNANT G354.4+0.0

    SciTech Connect (OSTI)

    Roy, Subhashis [NCRA-TIFR, Pune 411007 (India); Pal, Sabyasachi, E-mail: roy@ncra.tifr.res.in, E-mail: sabya@csp.res.in [Indian Centre for Space Physics, Kolkata 700084 (India)

    2013-09-10T23:59:59.000Z

    We report the discovery of a shell-like structure G354.4+0.0 of size 1.'6 that shows the morphology of a shell supernova remnant (SNR). Part of the structure shows polarized emission in a NRAO VLA sky survey map. Based on 330 MHz and 1.4 GHz Giant Metrewave Radio Telescope observations and existing observations at higher frequencies, we conclude that the partial shell structure showing synchrotron emission is embedded in an extended H II region of size {approx}4'. The spectrum of the diffuse H II region turns over between 1.4 GHz and 330 MHz. The H I absorption spectrum shows this objected to be located more than 5 kpc from Sun. Based on its morphology, non-thermal polarized emission, and size, this object is one of the youngest SNRs discovered in the Galaxy with an estimated age of {approx}100-500 yr.

  12. ORNL devises recipe to fine-tune diameter of silica rods | ornl.gov

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the ContributionsArms Control R&DNuclearNuclearCamilaOak Ridge National Laboratory

  13. Economic and Performance Benefits Resulting From the Use of Large Diameter

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision has beenFfe2fb55-352f-473b-a2dd-50ae8b27f0a6 No revision hasESEInformationFans on Air Cooled Heat

  14. Restoring silvopastures with oak saplings: effects of mulch and diameter class on survival, growth,

    E-Print Network [OSTI]

    . Navarro Received: 13 March 2014 / Accepted: 14 August 2014 / Published online: 23 August 2014 � Springer. Sa´nchez- Miranda Á F. B. Navarro AGROECOSOST Research Group, Institute of Agricultural Research

  15. Brake rotor design and comparison using finite element analysis : an investigation in topology optimization

    E-Print Network [OSTI]

    Domond, Kenneth

    2010-01-01T23:59:59.000Z

    An Introduction to the Conjugate Gradient Method Without thedescent method and the conjugate gradient method. The onlymethod and the conjugate gradient method can be found in

  16. Rotor Termination in a Patient-Specific Model of Atrial Fibrillation /

    E-Print Network [OSTI]

    Gonzales, Matthew James

    2013-01-01T23:59:59.000Z

    of atrial fibrillation termination by rapidly unbinding Na+of atrial fibrillation termination by pure sodium channelfor spontaneous termination of reentrant tachycardias.

  17. Dynamic Response of a Rotor-air Bearing System Due to Base Induced Periodic Motions

    E-Print Network [OSTI]

    Niu, Yaying

    2010-01-14T23:59:59.000Z

    equipment such as turbochargers and micro gas turbine engines. For example, air flow fluctuations and landing sudden maneuver can introduce random excitations or shock to auxiliary power units for aircrafts. Diesel engine induced vibrations and road...

  18. Co-Simulation of an Interior Permanent Magnet Synchronous Motor with Segmented Rotor Structure

    E-Print Network [OSTI]

    Paderborn, Universität

    Christoph Schulte and Joachim B¨ocker Power Electronics and Electrical Drives, Paderborn University, D-33095 Paderborn, Germany schulte@lea.upb.de, boecker@lea.upb.de Abstract--Accurate simulation of electric drives, electrical drive, multi-slice approach I. INTRODUCTION Conventionally, a two-step process is being used

  19. E-Print Network 3.0 - active rotor-blade vibration Sample Search...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Chalmers University of Technology, Sweden Collection: Fossil Fuels 66 Applications: Wind turbine structural health Summary: believe that particularly susceptible turbine...

  20. Identification of force coefficients in flexible rotor-bearing systems - enhancements and further validations

    E-Print Network [OSTI]

    Balantrapu, Achuta Kishore Rama Krishna

    2005-11-01T23:59:59.000Z

    identification of bearing force parameters, i.e. stiffness and damping coefficients, is one of the most difficult to achieve. Field identification by imbalance response measurements is a simple and often reliable way to determine synchronous speed force...

  1. Magnetic Patterning of Permanent-Magnet Rotors for Microscale Motor/Generators

    E-Print Network [OSTI]

    offers three advantages. First, eliminating the integrated winding permits simpler MH design element modeling 1. INTRODUCTION High power-density, microscale, axial-flux, PM machines [1-3] typically (Thickness = 0.5 mm, OD=9.5 mm) encased in a Ti adaptor used for microscale power generator [1]; (b

  2. Multi-piece wind turbine rotor blades and wind turbines incorporating same

    DOE Patents [OSTI]

    Moroz; Emilian Mieczyslaw (San Diego, CA) [San Diego, CA

    2008-06-03T23:59:59.000Z

    A multisection blade for a wind turbine includes a hub extender having a pitch bearing at one end, a skirt or fairing having a hole therethrough and configured to mount over the hub extender, and an outboard section configured to couple to the pitch bearing.

  3. Experimental response of a rotor supported on Rayleigh step gas bearings

    E-Print Network [OSTI]

    Zhu, Xuehua

    2004-11-15T23:59:59.000Z

    1 INTRODUCTION Micro-turbomachinery demands gas bearings to ensure compactness, lightweight and extreme temperature operation [1, 2]. Gas film bearings, unlike oil-lubricated bearings, offer advantages of low friction and less heat... and complex sealing and lubricant circulation systems. Furthermore, these oil-free bearing applications eliminate process fluid contamination and are environmental friendly. The main disadvantages of gas film bearings are little damping and low load...

  4. Measurements of unbalance response in a squeeze film damper test rotor-kit

    E-Print Network [OSTI]

    Laos, Hector Emilio

    1995-01-01T23:59:59.000Z

    for three cases: centered journal, offcentered journal at 30% and 60% of the radial clearance. Different masses of unbalance are used for each case . All the experiments were performed at room temperature and at an oil inlet pressure of 6.9 kPa. The cascade...

  5. Rotor Termination in a Patient-Specific Model of Atrial Fibrillation /

    E-Print Network [OSTI]

    Gonzales, Matthew James

    2013-01-01T23:59:59.000Z

    and even if any oscillations in voltage are present, they doand temporal (B) oscillations in the voltage solution of aexcursion of voltage was in fact the Gibbs oscillations or

  6. The effect of imbalance distribution and measurement locations on critical speeds in a turboprop engine rotor

    E-Print Network [OSTI]

    Marin, Manuel

    2012-06-07T23:59:59.000Z

    Imbalance Response at RY aud RX. imbalance Mass at tbe Coupling) 35 6 a. d 5 CL E 0 1IXXI 2000 3000 ?XXI SXm 6000 7OIXI SXXI 9000 10000111XXI12000 IXXXI1400016000 Spddd &rpm& TX 6 d N 'E 5 Ol 4 O. E 3 D 1000 2CCO 3000 4XXI SOXI 6000 7000.... 000- sa 0. 500? N "O. 00O E 0 0 Z 41 500 -' 2 4 8 10 12 14 16 18 20 24 26 Axial Location measured from the coupling (in) Figure 6. Measured Free-Free Vibration Frequency Spectrum and Mode Shape for Gas Generator Spool - 16 Maae Oot Date A CHI...

  7. Double Side Control of Wound Rotor Induction Machine for Wind Energy Application Employing Half Controlled

    E-Print Network [OSTI]

    Lipo, Thomas

    the cost of a wind generator system, a new configuration using half controlled converters for both the required KVA rating of both machine side and line side converters, improves the efficiency of the wind generator, helps operating over a wide speed range and supports near unity power factor interface

  8. Rotordynamic performance of a rotor supported on bump-type foil bearings: experiments and predictions

    E-Print Network [OSTI]

    Rubio Tabares, Dario

    2006-08-16T23:59:59.000Z

    ]. Bump foils x 25 Top foil Spot weld Bearing sleeve Journal Spot weld lines x 5 Shaft rotation Figure I-1 Schematic representation of a bump-type gas foil bearing This thesis follows the style of the Journal of Engineering for Gas Turbines... show nonlinear FB deflections, varying with the orientation of the load relative to the foil spot weld. Loading and unloading tests evidence hysteresis. The FB structural stiffness increases as the bumps-foil radial...

  9. Computation of the National Renewable Energy Laboratory Phase-VI Rotor in Pitch Motion during Standstill

    SciTech Connect (OSTI)

    Sorensen, N. N.; Schreck, S.

    2012-04-01T23:59:59.000Z

    Previously, computational fluid dynamics (CFD) computations of dynamic stall on wind turbine blades have been performed for stand still conditions with moderate success by among others the present authors. In the present work, numerical investigations are performed to illustrate the possibilities of state of the art CFD methods for this problem, including the numerical requirements as time-step and grid resolution. Additionally, the effect of different types of modeling is investigated, ranging from fully turbulent Reynolds-averaged Navier-Stokes (RANS), transitional RANS, to transitional delayed detached-eddy simulation computations. The investigation indicates that detailed information and fair agreement with measurements can be obtained.

  10. Numerical study of a rotor/stator interaction case experimentally simulated with an industrial compressor

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    energy efficiency may be achieved by minimizing the clearance between the rotating blade tips- tion of the HR15Y hardness test on abradable material. It was shown that a bilinear plastic law could developments focused on the modeling of abradable coating through mono-dimensional plastic el- ements [10

  11. On the characteristics of fault-induced rotor-dynamic bifurcations and nonlinear responses

    E-Print Network [OSTI]

    Yang, Baozhong

    2004-11-15T23:59:59.000Z

    and Poincare map of the response in (a) .........41 3.4 (a) Time history of a nonlinear time-delay model. (b) Corresponding phase portrait and Poincare map of the response in (a) .........42 3.5 Phase portrait and Poincare map of a fractal... reaction forces, which in turn could result in strong nonlinear responses including period-doubling bifurcation, quasi-periodic bifurcation, and even chaotic response [4,5]. Nonlinear dynamical states of quasi-periodic, fractal, and chaotic motions...

  12. Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise

    E-Print Network [OSTI]

    Defoe, Jeff (Jeffrey James)

    2011-01-01T23:59:59.000Z

    A body-force-based fan model for the prediction of multiple-pure-tone noise generation is developed in this thesis. The model eliminates the need for a full-wheel, three-dimensional unsteady RANS simulation of the fan blade ...

  13. Turning Waste Heat into Power: Ener-G-Rotors and the Entrepreneurial

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7DepartmentEnergy

  14. What Stator Current Processing Based Technique to Use for Induction Motor Rotor Faults Diagnosis?

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    drives in central power plants of power systems, as well as restricted role in low MVA power supply systems as induction generators, mining industries, petrochemical industries, as well as in aerospace

  15. Imbalance response of a rotor supported on a floating ring fluid film bearing

    E-Print Network [OSTI]

    Naranjo, Julio Enrique

    1999-01-01T23:59:59.000Z

    running speed (10,000 rpm). The system non linearity is evidenced by two self-excited subsynchronous vibration components identified from the experiments. The first subsynchronous component is associated with the instability of the inner film...

  16. The effects of torsional-lateral coupling on the dynamics of a gear coupled rotor

    E-Print Network [OSTI]

    Emery, Michael Aaron

    2007-04-25T23:59:59.000Z

    Mass of Gear 2 Mass Moment of Inertia of Gear 1 m m J 2 Mass Moment of Inertia of Gear 2 Equivalent Tooth Stiffness... to Gear Running Speed ..........................................65 Nonsynchronous Vibrations and the Wachel Paper..............................................70 The Rotating Moment Arm?s Effect on System Vibration ...................................73...

  17. A tilt rotor UAV for long endurance operations in remote environments

    E-Print Network [OSTI]

    VanderMey, Josiah T

    2011-01-01T23:59:59.000Z

    Extended mission times will greatly expand the utility of small UAVs that are currently limited to a single flight lasting no more than a few hours. This thesis assesses the challenges to developing a small, long endurance ...

  18. UNIVERSITY of CALIFORNIA INVESTIGATION OF HOW ANGLE OF ATTACK AFFECTS ROTOR SPEED

    E-Print Network [OSTI]

    Belanger, David P.

    -pitch blades is tested in UCSC's wind tunnel. The turbine is used to test how varying the blade angle affects the turbine's rotational speed at different wind speeds. The data are used to determine how the blade angle 27 Appendix A Wind Turbine Data 29 Appendix B Converting Blade Pitch to Needle Angle 33 Appendix C

  19. COE Reductions through Active Aerodynamic Control of Rotor Aerodynamics and Geometry

    SciTech Connect (OSTI)

    Griffin, D. A.; McCoy, T. J.

    2008-12-01T23:59:59.000Z

    This study investigates potential cost of energy reductions that might be achieved by designing active systems to mitigate loads throughout the wind turbine system.

  20. Gibbsianness versus Non-Gibbsianness of time-evolved planar rotor models

    E-Print Network [OSTI]

    enough. Le Ny and Redig generalized in [LeNRed02] the result for small times t to more general dynamics

  1. Sandia National Laboratories: Offshore Wind RD&D: Large Offshore Rotor

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErik Spoerke SSLSMolten-Salt StorageNo MoreMagneticallyElectronOffshore

  2. Sandia National Laboratories: The Influence of Rotor Blade Design on Wake

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -theErikGroundbreakingStandardsTCES Sandia ResearchersDevelopment

  3. SMART Wind Turbine Rotor: Design and Field Test | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l LPROJECTS IN7 Roadmap forDKT.Awards and IncentivesSHARPofofSMARTDesign

  4. Sandia National Laboratories: New Facility Tool at SWiFT Makes Rotor Work

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassive SolarEducationStationCSP Resources On September 26, 2012,More Efficient

  5. LARGE EDDY SIMULATION AND MEASUREMENTS IN A TURBULENT ROTOR-STATOR FLOW

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ). The flow has significant industrial applications, such as internal gas- turbine flows and computer hard model is based on Spectral Vanishing Viscosity (SVV). The key particularity of this model

  6. Magnetic Lossess Simulation in PM SM Drive by FE: Harmonic Superposition by Method of Locked Rotor

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Permanent magnet synchronous machine (PMSM), with its simplicity, high efficiency even at low speeds, strong

  7. Passivity-based control of a wound-rotor synchronous Arnau D`oria-Cerezoa

    E-Print Network [OSTI]

    Batlle, Carles

    of using a WRSM in front of the permanent magnet synchronous motor (PMSM), is the ability to compensate

  8. Fourth Annual Progress Report on the Electrofluid Dynamic Wind Generator: Final Report for the Period 1 April 1979 - 31 August 1980

    SciTech Connect (OSTI)

    Minardi, J. E.; Lawson, M. O.; Wattendorf, F. L.

    1981-08-01T23:59:59.000Z

    Conventional wind energy systems are limited in wind turbine diameter by allowable rotor stresses at power levels of several megawatts. In contrast, the Electrofluid Dynamic (EFD) wind driven generator has no fundamental limits on cross sectional area. It is a direct energy conversion device which employs unipolar charged particles transported by the wind against a retarding voltage gradient to a high potential. As no moving parts are exposed to the wind, extremely large power units may be feasible.

  9. 1/17/2014 World's smallest windmills to power cell phones http://www.gizmag.com/worlds-smallest-windmill-energy-harvesting/30425/ 1/9

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    horizontal axis wind turbines) have a three-bladed rotor 1.8 mm in diameter mounted on a tower about 2 mm wind turbines have been trending toward larger sizes, from 300 kW capacity in 1990 to 7.5 MW in 2011, and predicting the exact performance of a horizontal-axis wind turbine is still a bit of a magic art (in

  10. Evaluation of multi-brush anode systems in microbial fuel cells Vanessa Lanas, Bruce E. Logan

    E-Print Network [OSTI]

    on performance was studied in terms of carbon fiber length (brush diameter), the number of brushes connected (You et al., 2007), carbon cloth (Wang et al., 2009), and activated carbon fiber felt (Zhu et al., 2011 27 August 2013 Available online 5 September 2013 Keywords: Microbial fuel cell Carbon brush anode

  11. Optimal design of a micro-orifice for constant evaporator superheat in a small cooler

    E-Print Network [OSTI]

    Kim, Jongwon

    of the orifice, the aspect ratio between length and diameter, the entrance angle to the orifice, and the surface through the condenser (B) with a heat pipe. Then, the orifice (C) changes the liquid to two-phase vapor device is required for the isenthalpic process between the condenser and the evaporator. The expansion

  12. Pipe viscometry of foams C. Enzendorfer

    E-Print Network [OSTI]

    Valkó, Peter

    Pipe viscometry of foams C. Enzendorfer Institute of Drilling and Production, Mining University This paper describes a method for extracting useful information from small-scale pipe viscometer,and quality was determined in pipes of five diameters. The flow curves showed a marked dependenceon

  13. Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha

    E-Print Network [OSTI]

    Nabben, Reinhard

    Phonon dispersion of carbon nanotubes J. Maultzscha,*, S. Reicha , C. Thomsena , E. Dobardz the phonon dispersion relations of single-wall carbon nanotubes calculated within a force-constants approach 6 and 12 cm21 independent of the tube diameter. The order of the high-energy modes at the G

  14. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@inp-toulouse.fr

    E-Print Network [OSTI]

    Boyer, Edmond

    analysis techniques are used in order to compare the resulting Sauter mean diameters. The comparison of a series of identical motionless ele- ments inserted in a pipe, column or reactor. They redistribute the fluid in directions transverse to the main flow. The only energy cost depends on the power required

  15. This article was downloaded by: [Rochester Institute of Technology] On: 15 April 2014, At: 13:34

    E-Print Network [OSTI]

    Kandlikar, Satish

    diameter. The tubes were made by electrodepositing nickel on an aluminum sacrificial substrate. The desired roughness structures were machined or etched on the substrate before depositing nickel to generate a replica of the aluminum substrate on the internal surface of the nickel tubes. Four different surface roughness features

  16. SYSTMES A VIDE POUR INSTALLATIONS DE FUSION THERMONUCLAIRE (*)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    différentes pompes qui sont actuellement en construction. Abstract. 2014 Thermo-nuclear plants set a special of plant the vacuum vessel is of toroidal shape of a few meters in diameter; the effective volume amounts which in most cases operates independently of the fore-vacuum system. In small test systems

  17. JOURNAL DE PHYSIQUE Colloque C8, supplement au n012, Tome 48, dkcembre 1987

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    long and 13mn diameter. The crystals were deformed by compression along the axis o f the cylinder i n IN ALUMINIUM SINGLE CRYSTALS AT MHz FREQUENCIES M. ZEIN Physics Department, University of Bahrain, College (100>, orientation, were deformed by compression, and the temperature dependence o f

  18. DOI: 10.1002/adfm.200700379 Monodisperse Thermoresponsive Microgels with Tunable

    E-Print Network [OSTI]

    diameter, the size of the micro- gel cannot be used as a control variable. Another well-known method alternative is to fabricate hydro- gels with heterogeneous internal microstructures[36­40] instead the volume- phase transition kinetics of thermo-sensitive PNIPAM micro- gels. Our method does not involve any

  19. DISCRETE ELEMENT MODELING OF BLADE–STRIKE FREQUENCY AND SURVIVAL OF FISH PASSING THROUGH HYDROKINETIC TURBINES

    SciTech Connect (OSTI)

    Romero Gomez, Pedro DJ; Richmond, Marshall C.

    2014-04-17T23:59:59.000Z

    Evaluating the consequences from blade-strike of fish on marine hydrokinetic (MHK) turbine blades is essential for incorporating environmental objectives into the integral optimization of machine performance. For instance, experience with conventional hydroelectric turbines has shown that innovative shaping of the blade and other machine components can lead to improved designs that generate more power without increased impacts to fish and other aquatic life. In this work, we used unsteady computational fluid dynamics (CFD) simulations of turbine flow and discrete element modeling (DEM) of particle motion to estimate the frequency and severity of collisions between a horizontal axis MHK tidal energy device and drifting aquatic organisms or debris. Two metrics are determined with the method: the strike frequency and survival rate estimate. To illustrate the procedure step-by-step, an exemplary case of a simple runner model was run and compared against a probabilistic model widely used for strike frequency evaluation. The results for the exemplary case showed a strong correlation between the two approaches. In the application case of the MHK turbine flow, turbulent flow was modeled using detached eddy simulation (DES) in conjunction with a full moving rotor at full scale. The CFD simulated power and thrust were satisfactorily comparable to experimental results conducted in a water tunnel on a reduced scaled (1:8.7) version of the turbine design. A cloud of DEM particles was injected into the domain to simulate fish or debris that were entrained into the turbine flow. The strike frequency was the ratio of the count of colliding particles to the crossing sample size. The fish length and approaching velocity were test conditions in the simulations of the MHK turbine. Comparisons showed that DEM-based frequencies tend to be greater than previous results from Lagrangian particles and probabilistic models, mostly because the DEM scheme accounts for both the geometric aspects of the passage event ---which the probabilistic method does--- as well as the fluid-particle interactions ---which the Lagrangian particle method does. The DEM-based survival rates were comparable to laboratory results for small fish but not for mid-size fish because of the considerably different turbine diameters. The modeling framework can be used for applications that aim at evaluating the biological performance of MHK turbine units during the design phase and to provide information to regulatory agencies needed for the environmental permitting process.

  20. Measurement of time dependent fields in high gradient superconducting quadrupoles for the Tevatron

    SciTech Connect (OSTI)

    Lamm, M.J.; Coulter, K.; Gourlay, S.; Jaffery, T.S.

    1990-10-01T23:59:59.000Z

    Magnetic field measurements have been performed on prototype and production magnets from two high gradient superconducting quadrupoles designs. One design is a double shell quadrupole with 36 strand Rutherford cable. The other design is a single shell quadrupole with 5 individually monolithic strands connected in series. These magnets have similar bore diameters and cable dimensions. However, there are significant differences between the two designs, as well as differences between prototype and production magnets within each design, with regard to Cu to superconductor ratio, filament diameter and filament spacing to strand diameter. The time dependence of fixed currents of the measured magnetic fields is discussed. 9 refs., 6 figs., 1 tab.

  1. Center and diameter problems in plane triangulations and quadrangulations Victor Chepoi 1 Feodor Dragan 2 Yann Vaxes 1

    E-Print Network [OSTI]

    Chepoi, Victor

    Dragan 2 Yann Vaxâ??es 1 Abstract. In this note, we present first linear time algo­ rithms for computing

  2. The effects of plate thickness and perforation diameter on the supporting vapor velocity for a perforated plate fractionating column

    E-Print Network [OSTI]

    Cottle, John Ernest

    1948-01-01T23:59:59.000Z

    by means of a Y/estphal balanoe ~ surface tensions by a Cence du 1'7ouy tensi- ometer (3), and liquid. viscositi by the use of modified Ostwald vis- cosity tubes. V SUPPORT AIIO RvCOV;=, RY VAPOR VZLDCITIRS Soon after the experimental colunn was put...

  3. Development of Larger Diameter High Pressure CNG Cylinder Manufactured by Piercing and Drawing for Natural Gas Vehicle

    Broader source: Energy.gov [DOE]

    These slides were presented at the International Hydrogen Fuel and Pressure Vessel Forum on September 27 – 29, 2010, in Beijing, China.

  4. through 20-gauge (nominal inner diameter: 0.6 mm) needles into rotating 40 wt.-% PEI (branched; average molecular weight,

    E-Print Network [OSTI]

    Weibel, Douglas B.

    . [16] M. Shim, A. Javey, N. W. S. Kam, H. Dai, J. Am. Chem. Soc. 2001, 123, 11 512. [17] E. V. Basiuk] T. V. Sreekumar, T. Liu, B. G. Min, H. Guo, S. Kumar, R. H. Hauge, R. E. Smalley, Adv. Mater. 2004

  5. The design of a reduced diameter Pebble Bed Modular Reactor for reactor pressure vessel transport by railcar

    E-Print Network [OSTI]

    Everson, Matthew S

    2009-01-01T23:59:59.000Z

    Many desirable locations for Pebble Bed Modular Reactors are currently out of consideration as construction sites for current designs due to limitations on the mode of transportation for large RPVs. In particular, the ...

  6. Changes in diameter growth of Taxodium distichum (L.) Rich in response to flow alterations in the Savannah River.

    E-Print Network [OSTI]

    Palta, Monica Marie

    2005-01-01T23:59:59.000Z

    ??The Savannah River was impounded in the 1950’s near Augusta, Georgia (USA) by Thurmond Dam, a large hydroelectric facility. The objectives of this study were… (more)

  7. The application of the fusion method of thermit welding to small diameter tubing: An analysis of joint geometry.

    E-Print Network [OSTI]

    Glynn, Thomas Michael

    1972-01-01T23:59:59.000Z

    and gap. The welded samples were subjected to a hydrostatic test and a guided bend test as specified by the ASTPI Standards. (ASTPI Designation AS3-61T. ) The results of these tests were that seventeen of the eighteen samples tested developed leaks... period of 5 seconds. This test was used to determine if' the welded sample had adequate st, rength to withstand the f'orces exerted on if and to determine if' the joint was Pres of' leaks. Following the hydrostatic test, the samples were subjected...

  8. Measuring the nonlinearity of silicon piezoresistance by tensile loading of a submicron diameter fiber using a microinstrument

    E-Print Network [OSTI]

    MacDonald, Noel C.

    that these fibers re- main single crystalline after fabrication,6 and low-energy electron energy loss spectroscopy February 2003; accepted 14 October 2003 This report presents a mechanical loading experiment utilizing these issues, and we have designed the machine to measure the electrical and mechanical properties of submicron

  9. 53Estimating the Diameter of the SN1979C Black Hole The Chandra X-Ray Observatory

    E-Print Network [OSTI]

    with a mass of 120 solar masses. Can it escape or remain where it is? Space Math http, as well as NASA's Swift, the European Space Agency's XMM-Newton and the German ROSAT observatory revealed been observed. This behavior and the X-ray spectrum, or distribution of X-rays with energy, support

  10. Finite element analysis and design of large diameter flexible vertical pipes subjected to incremental compacted backfill loads and creep effects

    E-Print Network [OSTI]

    Hossain, Mohammad Kabir

    1990-01-01T23:59:59.000Z

    FINITE ELEMENT ANALYSIS AND DESiGN OF LARGE DIANETER FLEXIBLE VERTICAL PIPES SUBJECTED TO INCREMENTAL COMPACTED BACKFILL LOADS AND CREEP EFFECTS A Thesis by MOHAMMAD KABIR HOSSAIN Submitted to the Office of Graduate Studies of Texas A... BACKFILL LOADS AND CREEP EFFECTS A Thesis by MOHAMMAD KABIR HOSSAIN Approved as to sty1e and content by: R be+r L. Lytton (Chair of Committee) Ozden 0. Ochoa (Member) Derek V. Morris (Member) ames T P Yao (Head of rtment) ABSTRACT Finite...

  11. Impact of Screening on Behavior During Storage and Cost of Ground Small-Diameter Pine Trees: A Case Study

    SciTech Connect (OSTI)

    Erin Searcy; Brad D Blackwelder; Mark E Delwiche; Allison E Ray; Kevin L Kenney

    2011-10-01T23:59:59.000Z

    Whole comminuted trees are known to self-heat and undergo quality changes during storage. Trommel screening after grinding is a process that removes fines from the screened material and removes a large proportion of high-ash, high-nutrient material. In this study, the trade-off between an increase in preprocessing cost from trommel screening and an increase in quality of the screened material was examined. Fresh lodgepole pine (Pinus contorta) was comminuted using a drum grinder with a 10-cm screen, and the resulting material was distributed into separate fines and overs piles. A third pile of unscreened material, the unsorted pile, was also examined. The three piles exhibited different characteristics during a 6-week storage period. The overs pile was much slower to heat. The overs pile reached a maximum temperature of 56.88 degrees C, which was lower than the maximum reached by the other two piles (65.98 degrees C and 63.48 degrees C for the unsorted and fines, respectively). The overs also cooled faster and dried to a more uniform moisture content and had a lower ash content than the other two piles. Both piles of sorted material exhibited improved airflow and more drying than the unsorted material. Looking at supply system costs from preprocessing through in-feed into thermochemical conversion, this study found that trommel screening reduced system costs by over $3.50 per dry matter ton and stabilized material during storage.

  12. Diameter-Controlled Vapor-Solid Epitaxial Growth and Properties of Aligned ZnO Nanowire Arrays

    E-Print Network [OSTI]

    Qin, Lu-Chang

    . Introduction Wurtzitic zinc oxide is a direct, wide band gap semiconductor that has attracted tremendous (ultraviolet or green/blue) electro-optical devices, chemical sensors, and varistors.1-5 In recent years oxide, so their commercial potential has been limited. Here we report a facile, template-free method

  13. Harvesting Overstocked Stands of Small Diameter Trees. Report No. 4: Cost and Productivity of New Felling and Forwarding Equipment.

    SciTech Connect (OSTI)

    Lambert, Michael B.; Howard, James O.; Biomass and Energy Project (Portland, Or.)

    1987-07-01T23:59:59.000Z

    This report describes the felling, bunching, and forwarding operations now working in the doghair stands on the Quilcene District. The felling was done with a Washington Logging Company FB-1 steep slope feller/buncher. The forwarding was done with a Timberjack 520A rubber-tired forwarder. Productivity and cost studies were required by the service contract between the Forest Service and the logging company. The intent of the studies was to capture the comprehensive technical and economic information provided by early operation of the total small tree harvesting and utilization system. This report focuses on the felling and delivery of the trees to the central processing system. 7 refs., 9 figs., 7 tabs.

  14. Page 1 of 3 EPA/WRF Project 04485 Durability and Reliability of Large Diameter (16 in. and

    E-Print Network [OSTI]

    Texas at Arlington, University of

    , 2008) HDPE: A plastic resin made by the copolymerization of ethylene and a small amount of another/cm (Plastics Pipe Institute, 2008) Joint: The means of connecting sectional length of pipeline system): Polyethylene (PE) is a thermoplastic material produced from the polymerization of ethylene. PE plastic pipe

  15. Heavy duty insulator assemblies for 500-kV bulk power transmission line with large diameter octagonalbundled conductor

    SciTech Connect (OSTI)

    Tsujimoto, K.; Hayase, I.; Hirai, J.; Inove, M.; Naito, K.; Yukino, T.

    1982-11-01T23:59:59.000Z

    This paper describes the design procedure and the results of field tests on mechanical performances of insulator assemblies newly developed to support octagonal-bundled conductors for 500-kV bulk power transmission. Taking account of conductor-motion-induced peak tensile load, fatigue, torsional torque and others, a successful design has been achieved in two prototype assemblies for such heavy mechanical duties as encountered during conductor galloping or swing. This has been proved throughout three years of the field tests.

  16. Ultra-high speed vacuum pump system with first stage turbofan and second stage turbomolecular pump

    DOE Patents [OSTI]

    Jostlein, Hans

    2006-04-04T23:59:59.000Z

    An ultra-high speed vacuum pump evacuation system includes a first stage ultra-high speed turbofan and a second stage conventional turbomolecular pump. The turbofan is either connected in series to a chamber to be evacuated, or is optionally disposed entirely within the chamber. The turbofan employs large diameter rotor blades operating at high linear blade velocity to impart an ultra-high pumping speed to a fluid. The second stage turbomolecular pump is fluidly connected downstream from the first stage turbofan. In operation, the first stage turbofan operates in a pre-existing vacuum, with the fluid asserting only small axial forces upon the rotor blades. The turbofan imparts a velocity to fluid particles towards an outlet at a high volume rate, but moderate compression ratio. The second stage conventional turbomolecular pump then compresses the fluid to pressures for evacuation by a roughing pump.

  17. Analysis and test results for a two-bladed, passive cycle pitch, horizontal-axis wind turbine in free and controlled yaw

    SciTech Connect (OSTI)

    Holenemser, K.H. [Washington Univ., St. Louis, MO (United States)

    1995-10-01T23:59:59.000Z

    This report surveys the analysis and tests performed at Washington University in St. Louis, Missouri, on a horizontal-axis, two-laded wind turbine with teeter hub. The introduction is a brief account of results obtained during the 5-year period ending December 1985. The wind tunnel model and the test turbine (7.6 m [25 ft.] in diameter) at Washington University`s Tyson Research Center had a 67{degree} delta-three angle of the teeter axis. The introduction explains why this configuration was selected and named the passive cycle pitch (PCP) wind turbine. Through the analysis was not limited to the PCP rotor, all tests, including those done from 1986 to 1994, wee conducted with the same teetered wind rotor. The blades are rather stiff and have only a small elastic coning angle and no precone.

  18. Apparatus and method for classifying fuel pellets for nuclear reactor

    DOE Patents [OSTI]

    Wilks, Robert S. (Plum Borough, PA); Sternheim, Eliezer (Pittsburgh, PA); Breakey, Gerald A. (Penn Township, Allegheny County, PA); Sturges, Jr., Robert H. (Plum Borough, PA); Taleff, Alexander (Churchill Borough, PA); Castner, Raymond P. (Monroeville, PA)

    1984-01-01T23:59:59.000Z

    Control for the operation of a mechanical handling and gauging system for nuclear fuel pellets. The pellets are inspected for diameters, lengths, surface flaws and weights in successive stations. The control includes, a computer for commanding the operation of the system and its electronics and for storing and processing the complex data derived at the required high rate. In measuring the diameter, the computer enables the measurement of a calibration pellet, stores that calibration data and computes and stores diameter-correction factors and their addresses along a pellet. To each diameter measurement a correction factor is applied at the appropriate address. The computer commands verification that all critical parts of the system and control are set for inspection and that each pellet is positioned for inspection. During each cycle of inspection, the measurement operation proceeds normally irrespective of whether or not a pellet is present in each station. If a pellet is not positioned in a station, a measurement is recorded, but the recorded measurement indicates maloperation. In measuring diameter and length a light pattern including successive shadows of slices transverse for diameter or longitudinal for length are projected on a photodiode array. The light pattern is scanned electronically by a train of pulses. The pulses are counted during the scan of the lighted diodes. For evaluation of diameter the maximum diameter count and the number of slices for which the diameter exceeds a predetermined minimum is determined. For acceptance, the maximum must be less than a maximum level and the minimum must exceed a set number. For evaluation of length, the maximum length is determined. For acceptance, the length must be within maximum and minimum limits.

  19. Influence of Rotor Structure and Number of Phases on Torque and Flux Weakening Characteristics of V-shape Interior PM

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , phase back-EMF, constant power operating capability. Keywords: V-shape magnet machine, straight number on the machine characteristics, PRIUS structure is transformed into 5-phase machine of the same type and dimensions. As well, an optimization procedure is carried out to determine the optimal open

  20. Optimization of a Savonius rotor vertical-axis wind turbine for use in water pumping systems in rural Honduras

    E-Print Network [OSTI]

    Zingman, Aron (Aron Olesen)

    2007-01-01T23:59:59.000Z

    The D-lab Honduras team designed and constructed a wind-powered water pump in rural Honduras during IAP 2007. Currently, the system does not work under its own power and water must be pumped by hand. This thesis seeks to ...

  1. Measured and Predicted Rotor-Pad Transfer Functions for a Rocker-Pivot Tilting-Pad Journal Bearing

    E-Print Network [OSTI]

    Wilkes, Jason Christopher

    2012-02-14T23:59:59.000Z

    Many researchers have compared predicted stiffness and damping coefficients for tilting-pad journal bearings (TPJBs) to measurements. Most have found that direct damping is consistently overpredicted. The thrust of this research is to explain...

  2. Compressibility effects on rotor forces in the leakage path between a shrouded pump impeller and its housing

    E-Print Network [OSTI]

    Cao, Nhai The

    1993-01-01T23:59:59.000Z

    . Radial displacement perturbations were used to solve for radial and circumferential force coefficients. In addition, impeller-discharge pressure disturbances were used to obtain pressure oscillation responses due to precessing impeller pressure wave... oscillation was shown to occur at the wearing ring seal. Introduction of impeller discharge disturbances with n = 11 diametral nodes showed that maximum peak pressure oscillations occurred at nondimensional precession frequencies (f = Q(ai where co...

  3. Impact of Rotor Surface Velocity, Leakage Models and Real Gas Properties on Rotordynamic Force Predictions of Gas Labyrinth Seals

    E-Print Network [OSTI]

    Thorat, Manish R.

    2010-07-14T23:59:59.000Z

    -coupled stiffness. A test case is implemented to study the impact of variation of seal axial radial clearance on stability characteristics. The 1CV model by Childs and Scharrer and subsequent bulk flow models are based on the assumption of isothermal flow across...

  4. A simple rotor current observer with an arbitrary rate of convergence for the Brushless Doubly-Fed

    E-Print Network [OSTI]

    Cambridge, University of

    . These advantages are realised through a reduced capital installation cost, due to a frac- tional inverter power drive (VSD), and as a generator where the prime mover speed can be variable, such as in a wind turbine requirement (as compared to that for an induction machine VSD (or generator)), and further, the advantages

  5. An experimental study of heat transfer in the rectangular coolant passages of a gas turbine rotor blade

    E-Print Network [OSTI]

    Uddin, Mohammed Jalal

    2000-01-01T23:59:59.000Z

    . Rotating hollow shaft 3. Belt drive 4. Bearing 5. Chasis of the experimental rig 6. Horizontal rotating arm 7. Test section inside the rotating arm 8. Air supply 9. Rotary connector for air supply 10. Slip ring assembly Fig. 2. 1 Schematic.... This is correlated by Dittus- Boelter/McAdams (Rohsenow and Choi, 1961) as Nu hD 1 Nu k . (0. 023 Re" Pr") (2) The Prandtl number, Pr, for air is 0. 71. Air properties are taken based on the mean bulk temperature. 2. 3 Uncertainty The uncertainty of the local...

  6. REAL-TIME ROTOR BAR CURRENT MEASUREMENTS USING BLUETOOTH TECHNOLOGY FOR A BRUSHLESS DOUBLY-FED MACHINE (BDFM)

    E-Print Network [OSTI]

    Cambridge, University of

    has attracted attention as a variable speed drive and as a generator in applications where the prime mover speed is variable, such as in wind turbines. For variable speed operation one of the machine)1223 332662 ABSTRACT The Brushless Doubly Fed Machine (BDFM) shows economic promise as a variable speed drive

  7. IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 907 Rotor Position Feedback Over an RF Link

    E-Print Network [OSTI]

    Mazumder, Sudip K.

    feedback control. The wireless scheme pre- cludes the need for the cable that feeds the position from the performance of the motor control system. As such, the feedback cable is shielded and the signals are provided in differential form, which increases the sensing cost. Therefore, motor-drive manufacturers have been focusing

  8. Numerical-experimental comparison in the simulation of rotor/stator interaction through blade-tip/abradable coating contact

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -Cramayel, France Abstract Higher aircraft energy efficiency may be achieved by minimizing the clearance be- tween K plastic modulus T,int interaction rotational period Structural Dynamics & Vibration Laboratory 1

  9. Rotational Augmentation on a 2.3 MW Rotor Blade with Thick Flatback Airfoil Cross-Sections: Preprint

    SciTech Connect (OSTI)

    Schreck, S.; Fingersh, L.; Siegel, K.; Singh, M.; Medina, P.

    2013-01-01T23:59:59.000Z

    Rotational augmentation was analyzed for a 2.3 MW wind turbine, which was equipped with thick flatback airfoils at inboard radial locations and extensively instrumented for acquisition of time varying surface pressures. Mean aerodynamic force and surface pressure data were extracted from an extensive field test database, subject to stringent criteria for wind inflow and turbine operating conditions. Analyses of these data showed pronounced amplification of aerodynamic forces and significant enhancements to surface pressures in response to rotational influences, relative to two-dimensional, stationary conditions. Rotational augmentation occurrence and intensity in the current effort was found to be consistent with that observed in previous research. Notably, elevated airfoil thickness and flatback design did not impede rotational augmentation.

  10. A Case Study on the Comparison of Non-parametric Spectrum Methods for Broken Rotor Bar Fault Detection

    E-Print Network [OSTI]

    Chow, Mo-Yuen

    long. A majority are used in electric utility industries, mining industries, petrochemical industries applications such as nuclear plants, aerospace and military applications, where the reliability must be at high to a likely costly downtime of the whole plant. More important, these failures may even result in the loss

  11. Mach number correlation for a two-dimensional helicopter rotor-blade analysis in the tip region

    E-Print Network [OSTI]

    Schillings, John Joseph

    1983-01-01T23:59:59.000Z

    . Comparison of chordwise pressure distributions between TRANDES and flight test (TAAT) results. Flight condition B, P = 90 degrees, radius = 86. 4 percent 16 17 3 c. Comparison of chordwise pressure distributions between TRANDES and flight test (TAAT.... 066 CP/SIG = 0. 008 Figure 3 c. Comparison of chordwise TRANDES and flight test 90 degrees, radius AZIMUTH = 90. 0 / RADIUS = 91. 0 MRCH NQ. (QRTRHAPI = 0. 813 CN = 0. 104 RLP(TRRNDESI = 0. 414 pressure distributions between (TAAT) results...

  12. The experimental and theoretical investigaton of a horizontal-axis wind turbine

    E-Print Network [OSTI]

    Milburn, Robert Terrance

    1977-01-01T23:59:59.000Z

    . Design details of the wind turbine are discussed by the sections shown in the figure . Main Su ort Assembl The 3/4 in. diameter rotor shaft is supported at each end by roller bearings. Each bearing is clamped between two aluminum blocks. A flange...THE EXPERIMENTAL AND THEORETICAL INVESTIGATION OF A HORIZONTAL-AXIS WIND TURBINE A Thesis by ROBERT TERRANCE MILBURN Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER...

  13. THE TESTING OF COMMERCIALLY AVAILABLE ENGINEERING AND PLANT SCALE ANNULAR CENTRIFUGAL CONTACTORS FOR THE PROCESSING OF SPENT NUCLEAR FUEL

    SciTech Connect (OSTI)

    Jack D. Law; David Meikrantz; Troy Garn; Nick Mann; Scott Herbst

    2006-10-01T23:59:59.000Z

    Annular centrifugal contactors are being evaluated for process scale solvent extraction operations in support of United State Advanced Fuel Cycle Initiative goals. These contactors have the potential for high stage efficiency if properly employed and optimized for the application. Commercially available centrifugal contactors are being tested at the Idaho National Laboratory to support this program. Hydraulic performance and mass transfer efficiency have been measured for portions of an advanced nuclear fuel cycle using 5-cm diameter annular centrifugal contactors. Advanced features, including low mix sleeves and clean-in-place rotors, have also been evaluated in 5-cm and 12.5-cm contactors.

  14. DEVELOPMENT OF MODIFIED WIND TURBINE: A PAST REVIEW

    E-Print Network [OSTI]

    Rob Res; N R Deshmukh; S J Deshmukh; N R Deshmukh; S J Deshmukh

    Wind energy represents a viable alternative, as it is a virtually endless resource. Through the next several decades, renewable energy technologies, thanks to their continually improving performance and cost, and growing recognition of their Environmental, economic and social values, will grow increasingly competitive with Traditional energy technologies, so that by the middle of the 21 st century, renewable Energy, in its various forms, should be supplying half of the world’s energy needs. In this paper various types of wind turbine are reviewed to understand and the development and modification of horizontal axis wind turbine and how more power can be generated compared to bare turbine of the same rotor blade diameter.

  15. The effect of construction variables on the dynamic modulus of asphalt treated base courses

    E-Print Network [OSTI]

    Moeller, William Ernest

    1970-01-01T23:59:59.000Z

    to specimen diameter. The actual coring of specimens was accomplished by the Tex"s 11igh;-ay Department utilizing a six-inch diameter, truck- mounted, water- cooled, coring machine, Saz!plcs were taI'en during January when the air tcz?perature ranged from... into each of the two baskets of. the cxLraction device and the device placed in operaLion. Extraction was stopped when both basioets produced a clear discharge, The average t ime for each extraction was 2 l/2 hours . After drying and cool ing...

  16. Ga nanoparticle-enhanced photoluminescence of GaAs

    SciTech Connect (OSTI)

    Kang, M.; Al-Heji, A. A.; Jeon, S.; Wu, J. H. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States)] [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Lee, J.-E.; Saucer, T. W.; Zhao, L.; Sih, V. [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States)] [Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States); Katzenstein, A. L. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States) [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Department of Physics, Eckerd College, St. Petersburg, Florida 33711-4744 (United States); Sofferman, D. L. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States) [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Department of Physics, Adelphi University, Garden City, New York 11530-0701 (United States); Goldman, R. S. [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States) [Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109-2136 (United States); Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040 (United States)

    2013-09-02T23:59:59.000Z

    We have examined the influence of surface Ga nanoparticles (NPs) on the enhancement of GaAs photoluminescence (PL) efficiency. We have utilized off-normal focused-ion-beam irradiation of GaAs surfaces to fabricate close-packed Ga NP arrays. The enhancement in PL efficiency is inversely proportional to the Ga NP diameter. The maximum PL enhancement occurs for the Ga NP diameter predicted to maximize the incident electromagnetic (EM) field enhancement. The PL enhancement is driven by the surface plasmon resonance (SPR)-induced enhancement of the incident EM field which overwhelms the SPR-induced suppression of the light emission.

  17. Double-layer ion acceleration triggered by ion magnetization in expanding radiofrequency plasma sources

    SciTech Connect (OSTI)

    Takahashi, Kazunori [Department of Electrical and Electronic Engineering, Iwate University, Morioka 020-8551 (Japan); Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, Australian National University, Canberra 0200 (Australia); Charles, Christine; Boswell, Rod W. [Space Plasma, Power and Propulsion Group, Research School of Physics and Engineering, Australian National University, Canberra 0200 (Australia); Fujiwara, Tamiya [Department of Electrical and Electronic Engineering, Iwate University, Morioka 020-8551 (Japan)

    2010-10-04T23:59:59.000Z

    Ion energy distribution functions downstream of the source exit in magnetically expanding low-pressure plasmas are experimentally investigated for four source tube diameters ranging from about 5 to 15 cm. The magnetic-field threshold corresponding to a transition from a simple expanding plasma to a double layer-containing plasma is observed to increase with a decrease in the source tube diameter. The results demonstrate that for the four geometries, the double layer and the accelerated ion beam form when the ion Larmour radius in the source becomes smaller than the source tube radius, i.e., when the ions become magnetized in the source tube.

  18. Shock destruction armor system

    DOE Patents [OSTI]

    Froeschner, Kenneth E. (Livermore, CA)

    1993-01-01T23:59:59.000Z

    A shock destruction armor system is constructed and arranged to destroy the force of impact of a projectile by shock hydrodynamics. The armor system is designed to comprise a plurality of superimposed armor plates each preferably having a thickness less than five times the projectile's diameter and are preferably separated one-from-another by a distance at least equal to one-half of the projectile's diameter. The armor plates are effective to hydrodynamically and sequentially destroy the projectile. The armor system is particularly adapted for use on various military vehicles, such as tanks, aircraft and ships.

  19. High resolution geophysical mapping of the Mississippi-Alabama Outer Continental Shelf

    E-Print Network [OSTI]

    Laswell, Jay Scott

    2012-06-07T23:59:59.000Z

    system, a 3. 5 or a 4. 0 kHz subbottom profiler system, and precision satellite or radio navigation. Three types of topographic features were identified: 1) reef-like mounds (RLM), ranging in diameter from 2 to 1000 meters and having heights from (1... to 18 meters, 2) ridges, having heights from &1 to 8 meters and up to 250 meters in width, and 3) shallow depressions, less than 1 meter deep, irregular in shape, and usually less than 10 meters in diameter. The RLM possibly formed by growth...

  20. Selectively patterning polymer opal films via microimprint lithography

    E-Print Network [OSTI]

    Ding, Tao; Zhao, Qibin; Smoukov, Stoyan; Baumberg, Jeremy J.

    2014-09-01T23:59:59.000Z

    functional patterning of such POFs. 2.1. Microimprinting of Polymer Opal Films The stamps used for imprinting are made by replicating a PDMS mold with epoxy resin. The initial stamp used comprises of a hexagonal array of 30 ?m high posts with diameter... the polymer opal surface to allow the microimprinting process. Microimprinting of Polymer Opal Films: The stamps used for microimprinting were made by replicating PDMS molds with epoxy resin (Sigma-Aldrich Epoxy Embedding Medium Kit). The stamps...