Sample records for daylighting control systems

  1. Neural daylight control system

    E-Print Network [OSTI]

    Grif, Horatiu Stefan

    2010-01-01T23:59:59.000Z

    The paper describes the design, the implementation of a neural controller used in an automatic daylight control system. The automatic lighting control system (ALCS) attempt to maintain constant the illuminance at the desired level on working plane even if the daylight contribution is variable. Therefore, the daylight will represent the perturbation signal for the ALCS. The mathematical model of process is unknown. The applied structure of control need the inverse model of process. For this purpose it was used other artificial neural network (ANN) which identify the inverse model of process in an on-line manner. In fact, this ANN identify the inverse model of process + the perturbation signal. In this way the learning signal for neural controller has a better accuracy for the present application.

  2. PERFORMANCE MODELING OF DAYLIGHT INTEGRATED PHOTOSENSOR- CONTROLLED LIGHTING SYSTEMS

    E-Print Network [OSTI]

    S. Jain; R. R. Creasey; J. Himmelspach; K. P. White; M. Fu; Richard G. Mistrick

    Some building energy codes now require the incorporation of daylight into buildings and automatic photosensor-controlled switching or dimming of the electric lighting system in areas that receive daylight. This paper describes enhancements to the open-source Daysim daylight analysis software that permit users to model a photosensor control system as it will perform in a real space, considering the directional sensitivity of the photosensor, its mounting position, the space and daylight aperture geometry, window shading configuration; the electric lighting equipment and control zones; exterior obstructions; and site weather conditions. System output includes assessment of the daylight distribution in a space throughout the year, the photosensor’s ability to properly track the daylight and modify electric lighting system output, and the energy savings provided by the modeled control system. The application of daylight coefficients permits annual simulations to be conducted efficiently using hourly or finer weather data time increments. 1

  3. The New York Times headquarters daylighting mockup: Monitoredperformance of the daylighting control system

    SciTech Connect (OSTI)

    Lee, Eleanor S.; Selkowitz, Stephen E.

    2006-02-24T23:59:59.000Z

    A nine-month monitored field study of the performance of automated roller shades and daylighting controls was conducted in a 401 m{sup 2} unoccupied, furnished daylighting mockup. The mockup mimicked the southwest corner of a new 110 km{sub 2} commercial building in New York, New York, where The New York Times will be the major tenant. This paper focuses on evaluating the performance of two daylighting control systems installed in separate areas of an open plan office with 1.2-m high workstation partitions: (1) Area A had 0-10 V dimmable ballasts with an open-loop proportional control system and an automated shade controlled to reduce window glare and increase daylight, and (2) Area B had digital addressable lighting interface (DALI) ballasts with a closed-loop integral reset control system and an automated shade controlled to block direct sun. Daylighting control system performance and lighting energy use were monitored. The daylighting control systems demonstrated very reliable performance after they were commissioned properly. Work plane illuminance levels were maintained above 90% of the maximum fluorescent illuminance level for 99.9{+-}0.5% and 97.9{+-}6.1% of the day on average over the monitored period, respectively, in Areas A and B. Daily lighting energy use savings were significant in both Areas over the equinox-to-equinox period compared to a non-daylit reference case. At 3.35 m from the window, 30% average savings were achieved with a sidelit west-facing condition in Area A while 50-60% were achieved with a bilateral daylit south-facing condition in Area B. At 4.57-9.14 m from the window, 5-10% and 25-40% savings were achieved in Areas A and B, respectively. Average savings for the 7-m deep dimming zone were 20-23% and 52-59% for Areas A and B, respectively, depending on the lighting schedule. The large savings and good reliability can be attributed to the automatic management of the interior shades. The DALI-based system exhibited faulty behavior that remains unexplained, but operational errors are expected to be resolved as DALI products reach full maturity. The building owner received very competitive bids ($30-75 US/DALI ballast) and was able to justify use of the daylighting control system based on operational cost savings and increased amenity. Additional energy savings due to reduced solar and lighting heat gains were not quantified but will add to the total operational cost savings.

  4. Daylight control system, device and method

    DOE Patents [OSTI]

    Paton, John Douglas

    2012-08-28T23:59:59.000Z

    A system and device for and a method of programming and controlling light fixtures is disclosed. A system in accordance with the present invention includes a stationary controller unit that is electrically coupled to the light fixtures. The stationary controller unit is configured to be remotely programmed with a portable commissioning device to automatically control the lights fixtures. The stationary controller unit and the portable commissioning device include light sensors, micro-computers and transceivers for measuring light levels, running programs, storing data and transmitting data between the stationary controller unit and the portable commissioning device. In operation, target light levels selected with the portable commissioning device and the controller unit is remotely programmed to automatically maintain the target level.

  5. Daylight control system device and method

    DOE Patents [OSTI]

    Paton, John Douglas

    2007-03-13T23:59:59.000Z

    A system and device for and a method of programming and controlling light fixtures is disclosed. A system in accordance with the present invention includes a stationary controller unit that is electrically coupled to the light fixtures. The stationary controller unit is configured to be remotely programmed with a portable commissioning device to automatically control the lights fixtures. The stationary controller unit and the portable commissioning device include light sensors, micro-computers and transceivers for measuring light levels, running programs, storing data and transmitting data between the stationary controller unit and the portable commissioning device. In operation, target light levels selected with the portable commissioning device and the controller unit is remotely programmed to automatically maintain the target level.

  6. Daylight control system device and method

    DOE Patents [OSTI]

    Paton, John Douglas

    2009-12-01T23:59:59.000Z

    A system and device for and a method of programming and controlling light fixtures is disclosed. A system in accordance with the present invention includes a stationary controller unit that is electrically coupled to the light fixtures. The stationary controller unit is configured to be remotely programmed with a portable commissioning device to automatically control the lights fixtures. The stationary controller unit and the portable commissioning device include light sensors, micro-computers and transceivers for measuring light levels, running programs, storing data and transmitting data between the stationary controller unit and the portable commissioning device. In operation, target light levels selected with the portable commissioning device and the controller unit is remotely programmed to automatically maintain the target level.

  7. Intelligent Daylight Panel Control System based on Fuzzy Control for Green Buildings

    E-Print Network [OSTI]

    T. C. Kuo; J. S. Lin; Y. Takeuchi; Y. J. Huang

    Abstract—This paper proposes an intelligent daylight panel control system based on fuzzy control theory for green buildings. The goal of this research is to automatically modulate sunlight efficiently and to enhance the quality of interior illuminations, thus reducing the need for artificial lighting and conserving energy. Daylight panels are typically installed on the outside of windows. By applying the proposed fuzzy controller, the reflection angle of daylight panels could be adjusted and optimized so that interior illuminative quality is improved and energy-saving is achieved at the same time. Index Terms—daylight panel, intelligent control, fuzzy control. I.

  8. The New York Times headquarters daylighting mockup: Monitored performance of the daylighting control system

    E-Print Network [OSTI]

    Lee, Eleanor S.; Selkowitz, Stephen E.

    2006-01-01T23:59:59.000Z

    1999. “Analysis of Daylight Responsive Dimming Systemglare and increase daylight, and 2) Area B had digitalthe stair to approximate the daylight contributions from the

  9. Dynamic daylight control system implementing thin cast arrays of polydimethylsiloxane-based millimeter-scale transparent louvers

    E-Print Network [OSTI]

    Aizenberg, Joanna

    Dynamic daylight control system implementing thin cast arrays of polydimethylsiloxane: Daylight control system Dynamic window system Energy-efficiency Transparent louvers a b s t r a c in standard office buildings. The development of daylight control systems that maximize the penetration

  10. A system for optimizing interior daylight distribution using reflective Venetian blinds with independent blind angle control

    E-Print Network [OSTI]

    McGuire, Molly E

    2005-01-01T23:59:59.000Z

    An operational algorithm for blind angle control is developed to optimize the daylighting performance of a system of reflective Venetian blinds. Numerical modeling and experiment confirm that independent control of alternating ...

  11. Combining daylighting, personal controls, and load shedding offers

    E-Print Network [OSTI]

    Combining daylighting, personal controls, and load shedding offers enormous potential for reducing lighting system to respond to available daylight and demand response control · Allows building occupants--Consider the improved cost-effectiveness of wireless dimming to promote daylighting controls and load- shedding

  12. Advanced fenestration systems for improved daylight performance

    E-Print Network [OSTI]

    Selkowitz, S.; Lee, E.S.

    1998-01-01T23:59:59.000Z

    Systems for Improved Daylight Performance S. Selkowitz, E.S.Systems for Improved Daylight Performance S. Selkowitz, E.S.Introduction The use of daylight to replace or supplement

  13. Integrating automated shading and smart glazings with daylight controls

    E-Print Network [OSTI]

    Selkowitz, Stephen; Lee, Eleanor

    2004-01-01T23:59:59.000Z

    Effect of Venetian Blinds on Daylight Photoelectric Controland Smart Glazings with Daylight Controls Stephen Selkowitzwith the outdoors and daylight to enhance the quality of the

  14. 2003: Energy performance of daylight-linked automatic lighting control systems in large atrium spaces: report on two field-monitored case studies

    E-Print Network [OSTI]

    M. R. Galasiu; Morad R. Atif; Anca D. Galasiu

    This paper presents the field-measured energy performance of two common types of daylight-linked lighting control systems, continuous dimming and automatic on/off installed in two existing large atrium spaces located in Canada. The daylighting performance was evaluated based on the daylight contribution to the indoor illuminance and the amount of electrical lighting displaced by daylighting via the daylight-linked lighting control systems. Measured daylighting contribution to the space indicates that significant lighting energy savings can be achieved in atrium spaces if the daylight-linked lighting control system is appropriately selected, installed and commissioned throughout its existence. Results extrapolated from measurements collected during summer and winter indicate that as installed, the continuous dimming lighting control system provides 46% annual savings in electrical lighting consumption, while the automatic on/off saves between 11-17% in lighting energy. These savings account for 68% of the lighting energy consumed during main occupancy for the continuous dimming system, and 31.5% for the automatic on/off. Operation irregularities such as a reduced dimming linearity and an incorrect adjustment of the phases of the dimming control system, as well as the inadequate location of the photocell controlling the automatic on/off lighting system, the improper maintenance of the skylight during winter and the oversizing of the lighting system reduced the energy efficiency of the lighting control systems by 30-65%.

  15. Daylighting controls; Orphan of HVAC design

    SciTech Connect (OSTI)

    Rundquist, R.A. (R.A. Rundquist Associates Inc., Northampton, MA (US))

    1991-11-01T23:59:59.000Z

    This paper reports that in the array of strategies employed for energy-efficient design and retrofitting in commercial buildings, the use of daylighting controls is often overlooked or omitted. Thus, daylighting controls are a worthy but neglected orphan of the design process, stranded between the lighting designer, architect and engineer. Most daylighting analysis ignores HVAC effects, despite obvious interactions between windows, heat-from-lights, and thermal loads.

  16. Performance of Integrated Systems of Automated Roller Shade Systems and Daylight Responsive Dimming Systems

    E-Print Network [OSTI]

    Park, Byoung-Chul

    2011-01-01T23:59:59.000Z

    Roller Shade Systems and Daylight Responsive Dimming SystemsRoller Shade Systems and Daylight Responsive Dimming SystemsBerkeley, CA 94720 Abstract Daylight responsive dimming

  17. Utilizing Daylighting Controls in a Manufacturing Facility

    E-Print Network [OSTI]

    Shrestha, S. S.; Maxwell, G. M.

    Utilizing Daylighting Controls in a Manufacturing Facility Som S. Shrestha Dr. Gregory M. Maxwell PhD Candidate Associate Professor som@iastate.edu gmaxwell@iastate.edu Iowa State University Ames, IA ABSTRACT Opportunities exist... to reduce artificial lighting in manufacturing facilities which have skylights and/or fenestration that provide sufficient quantities of daylight to the work space. Using photometric sensors to measure the illuminance in the space, artificial lights can...

  18. Simulating the Daylight Performance of Complex Fenestration Systems Using

    E-Print Network [OSTI]

    LBNL-4414E Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional, January 21, 2011. 1 Simulating the Daylight Performance of Complex Fenestration Systems Using (BSDFs) to model the daylighting performance of complex fenestration systems (CFS), enabling greater

  19. Lighting system combining daylight concentrators and an artificial source

    DOE Patents [OSTI]

    Bornstein, Jonathan G. (Miami, FL); Friedman, Peter S. (Toledo, OH)

    1985-01-01T23:59:59.000Z

    A combined lighting system for a building interior includes a stack of luminescent solar concentrators (LSC), an optical conduit made of preferably optical fibers for transmitting daylight from the LSC stack, a collimating lens set at an angle, a fixture for receiving the daylight at one end and for distributing the daylight as illumination inside the building, an artificial light source at the other end of the fixture for directing artifical light into the fixture for distribution as illumination inside the building, an automatic dimmer/brightener for the artificial light source, and a daylight sensor positioned near to the LSC stack for controlling the automatic dimmer/brightener in response to the daylight sensed. The system also has a reflector positioned behind the artificial light source and a fan for exhausting heated air out of the fixture during summer and for forcing heated air into the fixture for passage into the building interior during winter.

  20. Monitored Energy Performance of Electrochromic Windows Controlled for Daylight and Visual Comfort

    E-Print Network [OSTI]

    Lee, Eleanor S.; DiBartolomeo, Dennis L.; Klems, Joseph; Yazdanian, Mehry; Selkowitz, Stephen E.

    2005-01-01T23:59:59.000Z

    Windows Controlled for Daylight and Visual Comfort Eleanorof means to bring in daylight while minimizing window glare.was controlled to admit daylight while the lower zone was

  1. Technology reviews: Daylighting optical systems

    SciTech Connect (OSTI)

    Schuman, J.; Rubinstein, F.; Papamichael, K.; Beltran, L.; Lee, E.S.; Selkowitz, S.

    1992-09-01T23:59:59.000Z

    We present a representative review of existing, emerging, and future technology options in each of five hardware and systems areas in envelope and lighting technologies: lighting systems, glazing systems, shading systems, daylighting optical systems, and dynamic curtain wall systems. The term technology is used here to describe any design choice for energy efficiency, ranging from individual components to more complex systems to general design strategies. The purpose of this task is to characterize the state of the art in envelope and lighting technologies in order to identify those with promise for advanced integrated systems, with an emphasis on California commercial buildings. For each technology category, the following activities have been attempted to the extent possible: Identify key performance characteristics and criteria for each technology. Determine the performance range of available technologies. Identify the most promising technologies and promising trends in technology advances. Examine market forces and market trends.Develop a continuously growing in-house database to be used throughout the project. A variety of information sources have been used in these technology characterizations, including miscellaneous periodicals, manufacturer catalogs and cut sheets, other research documents, and data from previous computer simulations. We include these different sources in order to best show the type and variety of data available, however publication here does not imply our guarantee of these data. Within each category, several broad classes are identified, and within each class we examine the generic individual technologies that fall into that class.

  2. STATE OF CALIFORNIA AUTOMATIC DAYLIGHTING CONTROL ACCEPTANCE DOCUMENT

    E-Print Network [OSTI]

    STATE OF CALIFORNIA AUTOMATIC DAYLIGHTING CONTROL ACCEPTANCE DOCUMENT CEC-LTG-3A (Revised 07/10) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE LTG-3A Automatic Daylighting Control Acceptance fraction of rated light output. #12;STATE OF CALIFORNIA AUTOMATIC DAYLIGHTING CONTROL ACCEPTANCE DOCUMENT

  3. Roof aperture system for selective collection and control of solar energy for building heating, cooling and daylighting

    DOE Patents [OSTI]

    Sanders, William J. (Kansas City, KS); Snyder, Marvin K. (Overland Park, KS); Harter, James W. (Independence, MO)

    1983-01-01T23:59:59.000Z

    The amount of building heating, cooling and daylighting is controlled by at least one pair of solar energy passing panels, with each panel of the pair of panels being exposed to a separate direction of sun incidence. A shutter-shade combination is associated with each pair of panels and the shutter is connected to the shade so that rectilinear movement of the shutter causes pivotal movement of the shade.

  4. Integrating automated shading and smart glazings with daylight controls

    E-Print Network [OSTI]

    Selkowitz, Stephen; Lee, Eleanor

    2004-01-01T23:59:59.000Z

    Automated Shading and Smart Glazings with Daylight Controlsdaylighting, controls, smart glazing, shading, fielddeveloping switchable “smart glazings” for over a decade and

  5. Singapore's Zero-Energy Building's Daylight Monitoring System

    E-Print Network [OSTI]

    LBNL-3708E Singapore's Zero-Energy Building's Daylight Monitoring System Author(s), L. Grobe; S thereof or The Regents of the University of California. #12;Singapore's Zero-Energy Building's daylight, 94720 California, USA 1. Abstract A setup to monitor the daylighting performance of different glazing

  6. Performance of Integrated Systems of Automated Roller Shade Systems and Daylight Responsive Dimming Systems

    SciTech Connect (OSTI)

    Park, Byoung-Chul; Choi, An-Seop; Jeong, Jae-Weon; Lee, Eleanor S.

    2010-07-08T23:59:59.000Z

    Daylight responsive dimming systems have been used in few buildings to date because they require improvements to improve reliability. The key underlying factor contributing to poor performance is the variability of the ratio of the photosensor signal to daylight workplane illuminance in accordance with sun position, sky condition, and fenestration condition. Therefore, this paper describes the integrated systems between automated roller shade systems and daylight responsive dimming systems with an improved closed-loop proportional control algorithm, and the relative performance of the integrated systems and single systems. The concept of the improved closed-loop proportional control algorithm for the integrated systems is to predict the varying correlation of photosensor signal to daylight workplane illuminance according to roller shade height and sky conditions for improvement of the system accuracy. In this study, the performance of the integrated systems with two improved closed-loop proportional control algorithms was compared with that of the current (modified) closed-loop proportional control algorithm. In the results, the average maintenance percentage and the average discrepancies of the target illuminance, as well as the average time under 90percent of target illuminance for the integrated systems significantly improved in comparison with the current closed-loop proportional control algorithm for daylight responsive dimming systems as a single system.

  7. Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort

    E-Print Network [OSTI]

    Fernandes, Luis

    2014-01-01T23:59:59.000Z

    Energy Performance of Electrochromic Windows Controlled forenergy performance of electrochromic windows. Proceedingssignal for daylight (electrochromic window, no overhang).

  8. Daylighting control performance of a thin-film ceramic electrochromic window: field study results

    E-Print Network [OSTI]

    1 Daylighting control performance of a thin-film ceramic electrochromic window: field study results of this emerging technology. Keywords: Building energy-efficiency; Electrochromic windows; Daylighting; Control switched across their dynamic range and could be fully integrated into a complete daylight, glare

  9. Advanced optical daylighting systems: light shelves and light pipes

    SciTech Connect (OSTI)

    Beltran, L.O.; Lee, E.S.; Selkowitz, S.E.

    1996-05-01T23:59:59.000Z

    We present two perimeter daylighting systems that passively redirect beam sunlight further from the window wall using special optical films, an optimized geometry, and a small glazing aperture. The objectives of these systems are (1) to increase daylight illuminance levels at 4.6-9.1 m (15-30 ft) from the window aperture with minimum solar heat gains and (2) to improve the uniformity of the daylighting luminance gradient across the room under variable solar conditions throughout the year. The designs were developed through a series of computer-assisted ray-tracing studies, laser visualization techniques, and photometric measurements and observations using physical scale models. Bi-directional illuminance measurements in combination with analytical routines were then used to simulate daylight performance for any solar position, and were incorporated into the DOE-2.1E building energy analysis computer program to evaluate energy savings. Results show increased daylight levels and an improved luminance gradient throughout the year compared to conventional daylighting systems.

  10. Singapore's Zero-Energy Building's daylight monitoring system

    E-Print Network [OSTI]

    Grobe, Lars

    2010-01-01T23:59:59.000Z

    A and Mardaljevic J, Useful daylight illuminance: a newparadigm for assessing daylight in buildings, LightingJ and Rogers Z, Dynamic daylight performance metrics for

  11. Daylight metrics and energy savings

    E-Print Network [OSTI]

    Mardaljevic, John

    2011-01-01T23:59:59.000Z

    lighting energy use under daylight linked lighting controls.simulation of annual daylight illumi- nance distributions –and J. Mardaljevic. Useful daylight illuminances: A replace-

  12. Lighting and Daylight Harvesting

    E-Print Network [OSTI]

    Bos, J.

    2011-01-01T23:59:59.000Z

    exposing us to the latest products and technologies. Daylight Harvesting A system of controlling the direction and the quantity of light both natural and artificial within a given space. This implies: Control of fenestration in terms of size..., transmission and direction. Control of reflected light within a space. Control of electric light in terms of delivery and amount Daylight harvesting systems are typically designed to maintain a minimum recommended light level. This light level...

  13. The Soralux Daylighting System : passive solar illumination for deep-plan building spaces

    E-Print Network [OSTI]

    Thuot, Kevin W. (Kevin William)

    2011-01-01T23:59:59.000Z

    Daylight is a valuable resource for both energy and human health. However, this resource is often underutilized in buildings due to the difficulty of controlling the changing qualities of daylight. Deep-plan building spaces ...

  14. Singapore's Zero-Energy Building's daylight monitoring system

    SciTech Connect (OSTI)

    Grobe, Lars; Wittkopf, Stephen; Pandey, Anupama Rana; Xiaoming, Yang; Seng, Ang Kian; Scartezzini, Jean-Louis; Selkowitz, Stephen

    2010-02-28T23:59:59.000Z

    A setup to monitor the daylighting performance of different glazing types in Singapore is presented. The glazing is installed in the facade of four dedicated testing chambers in BCAA's Zero Energy Building in Singapore. These test rooms are equipped with sensors that both record illuminances on the work plane, and luminances as seen by occupants. The physical and logical design of the monitoring system is presented. Criteria to assess the daylighting performance are introduced, and initial results of the work in progress are presented.

  15. AUTOMATING THE SELECTION OF FENESTRATION SYSTEMS TO BEST MEET DAYLIGHTING PERFORMANCE GOALS

    E-Print Network [OSTI]

    AUTOMATING THE SELECTION OF FENESTRATION SYSTEMS TO BEST MEET DAYLIGHTING PERFORMANCE GOALS Luís closer to producing the desired flux distribution from the outdoor daylight distribution. INTRODUCTION The selection of fenestration systems for daylighting is traditionally done by trial and error. Designers try

  16. Singapore's Zero-Energy Building's daylight monitoring system

    E-Print Network [OSTI]

    Grobe, Lars

    2010-01-01T23:59:59.000Z

    Singapore’s Zero-Energy Building’s daylight monitoringSingapore’s Zero-Energy Building's daylight monitoringchambers in BCAA's Zero Energy Building in Singapore. These

  17. MANDATORY MEASURES DAYLIGHTING

    E-Print Network [OSTI]

    California at Davis, University of

    MANDATORY MEASURES DAYLIGHTING Reference: Sub-Chapter 4, Section 130.1(d) #12;SECTION 4 Daylighting daylighting controls. · Lighting in daylit zones should have multi-level steps, per Table 130.1-A · Light levels provided at night should be available at all other times · When sufficient daylight is available

  18. MANDATORY MEASURES DAYLIGHTING

    E-Print Network [OSTI]

    California at Davis, University of

    MANDATORY MEASURES DAYLIGHTING Reference: Sub-Chapter 4, Section 130.1(d) #12;SECTION 5 Daylighting daylighting controls. · Lighting in daylit zones should have multi-level steps, per Table 130.1-A · Light levels provided at night should be available at all other times · When sufficient daylight is available

  19. Singapore's Zero-Energy Building's daylight monitoring system

    E-Print Network [OSTI]

    Grobe, Lars

    2010-01-01T23:59:59.000Z

    DGP Established performance indicators are illuminanceled to new performance indicators. The Useful Daylightsimulation. The performance indicator used was the Daylight

  20. Towards Embedded Wireless-Networked Intelligent Daylighting Systems for Commercial Buildings

    E-Print Network [OSTI]

    Agogino, Alice M.

    Towards Embedded Wireless-Networked Intelligent Daylighting Systems for Commercial Buildings Yao, daylighting systems are not widely used in the commercial office building. Barriers prohibiting adoption) `Smart Dust motes' wireless platforms is explored. Due to their small size, they can be placed directly

  1. Singapore's Zero-Energy Building's daylight monitoring system

    E-Print Network [OSTI]

    Grobe, Lars

    2010-01-01T23:59:59.000Z

    Singapore’s Zero-Energy Building’s daylight monitoringof California. Singapore’s Zero-Energy Building's daylightchambers in BCAA's Zero Energy Building in Singapore. These

  2. A CRITICAL REVIEW OF SIMULATION TECHNIQUES FOR DAYLIGHT RESPONSIVE SYSTEMS

    E-Print Network [OSTI]

    L. Doulos; A. Tsangrassoulis; F. Topalis

    * corresponding author Application of lighting control technologies has increased the public interest. Although these technologies have been promoted during the last years their successful use in buildings has been accomplished in a small percentage of new projects. One reason is the difficulty in quantifying the energy savings and thus the subsequent payback period. The majority of existing simulation tools (which are embedded in building energy codes) –needed during initial design- are based on the estimation of the potential energy savings due to daylight. The paper focus on the limitations of current simulation approaches comparing their results, in order to assess their accuracy. For this, special test cases have been developed exploiting their domain of validity.

  3. Daylighting and solar shading performances of an innovative automated reflective louver system

    E-Print Network [OSTI]

    Hashemi, Arman

    2014-08-07T23:59:59.000Z

    follows initial investigations into the design and applicability of an automated retrofitted panel thermal shutters which can also act as a sunshade and daylighting system. The system has a patented function which allows each shutter...

  4. Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance

    E-Print Network [OSTI]

    Ward, Gregory

    2011-01-01T23:59:59.000Z

    761-81. Tregenza PR. 1983. Daylight coefficients. Lighting773. Reinhart CF. 2001. Daylight availability and manualA visualization of an incident daylight matrix (cumulative

  5. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2012-01-01T23:59:59.000Z

    of Task 21 / Annex 29, Daylight in Buildings. October, 1997.Energy performance of daylight-linked automatic lightingField Commissioning of a daylight-dimming lighting system.

  6. CALIFORNIA ENERGY Daylighting In Schools

    E-Print Network [OSTI]

    CALIFORNIA ENERGY COMMISSION Daylighting In Schools: Reanalysis Report TECHNICALREPORT October 2003 Departments, JimVan Dame of My-Lite Daylighting Systems and Products, Doug Gehring of Celotex, Ivan Johnson

  7. The Lightswitch Wizard -- reliable daylight simulations

    E-Print Network [OSTI]

    For Initial Design; C. F. Morrison; M. Dubrous; C. F. Reinhart ?; M. Morrison; F. Dubrous

    A web-based, non-expert daylighting analysis tool has been developed to support daylighting-related design decisions in peripheral private offices during an early design stage (http://buildwiz.com). The tool offers a comparative, reliable, and fast analysis of the annual amount of daylight in the offices (daylight factor and daylight autonomy) and the lighting energy performance of automated lighting controls (occupancy sensors, photocells) compared to standard on/off switches. Blinds are either manually or automatically controlled.

  8. International Symposium on Daylighting Buildings (IEA SHC TASK 31) Integrating Automated Shading and Smart Glazings with Daylight

    E-Print Network [OSTI]

    International Symposium on Daylighting Buildings (IEA SHC TASK 31) Integrating Automated Shading and Smart Glazings with Daylight Controls Stephen Selkowitz Eleanor Lee Lawrence Berkeley National Laboratory Keywords: daylighting, controls, smart glazing, shading, field testing, IEA31 1. INTRODUCTION Most

  9. Minimizing lighting power density in office rooms equipped with Anidolic Daylighting Systems

    SciTech Connect (OSTI)

    Linhart, Friedrich; Scartezzini, Jean-Louis [Solar Energy and Building Physics Laboratory (LESO-PB), Ecole Polytechnique Federale de Lausanne (EPFL), 1015 Lausanne (Switzerland)

    2010-04-15T23:59:59.000Z

    Electric lighting is responsible for up to one third of an office building's electricity needs. Making daylight more available in office buildings can not only contribute to significant energy savings but also enhance the occupants' performance and wellbeing. Anidolic Daylighting Systems (ADS) are one type of very effective facade-integrated daylighting systems. All south-facing office rooms within the LESO solar experimental building in Lausanne (Switzerland) are equipped with a given type of ADS. A recent study has shown that these offices' occupants are highly satisfied with their lighting environment. The most energy-efficient south-facing offices have a lighting power density of less than 5W/m{sup 2}. The lighting situation within these ''best practice''-offices has been assessed using the lighting simulation software RELUX Vision. Because this lighting situation is very much appreciated by the occupants, it was used as a starting point for developing even more energy-efficient office lighting designs. Two new lighting designs, leading to lighting power densities of 3.9W/m{sup 2} and 3W/m{sup 2}, respectively, have been suggested and simulated with RELUX Vision. Simulation results have shown that the expected performances of these new systems are comparable to that of the current lighting installation within the ''best practice''-offices or even better. These simulation results have been confirmed during experiments on 20 human subjects in a test office room recently set up within the LESO building. This article gives engineers, architects and light planers valuable information and ideas on how to design energy-efficient and comfortable electric lighting systems in office rooms with abundant access to daylight. (author)

  10. Daylighting Basics

    Broader source: Energy.gov [DOE]

    Daylighting is the use of windows and skylights to bring sunlight into buildings. Daylighting in businesses and commercial buildings can result in substantial savings on electric bills, and not only provides a higher quality of light but also improves productivity and health.

  11. Improving the daylighting conditions of existing buildings : the benefits and limitations of integrating anidolic daylighting systems using the American classroom as a model

    E-Print Network [OSTI]

    Kleindienst, Siân A. (Siân Alexandra)

    2006-01-01T23:59:59.000Z

    Awareness of the benefits of good daylighting has risen in recent years, and the designs of many new buildings take daylighting into consideration. However, the majority of our built environment is older than this recent ...

  12. Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort

    E-Print Network [OSTI]

    Fernandes, Luis

    2014-01-01T23:59:59.000Z

    Daylight Coefficients, Lighting Research and Technology,America, 1999, The IESNA lighting handbook: reference andcontrol of electric lighting and blinds, Solar Energy, 77(

  13. Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance

    SciTech Connect (OSTI)

    Ward, Gregory; Mistrick, Ph.D., Richard; Lee, Eleanor; McNeil, Andrew; Jonsson, Ph.D., Jacob

    2011-01-21T23:59:59.000Z

    We describe two methods which rely on bidirectional scattering distribution functions (BSDFs) to model the daylighting performance of complex fenestration systems (CFS), enabling greater flexibility and accuracy in evaluating arbitrary assemblies of glazing, shading, and other optically-complex coplanar window systems. Two tools within Radiance enable a) efficient annual performance evaluations of CFS, and b) accurate renderings of CFS despite the loss of spatial resolution associated with low-resolution BSDF datasets for inhomogeneous systems. Validation, accuracy, and limitations of the methods are discussed.

  14. THE DAYLIGHTING SOLUTION

    E-Print Network [OSTI]

    Selkowitz, Stephen

    2013-01-01T23:59:59.000Z

    of modulating sunlight and daylight. By intercepting directto the building owner. Daylight and sunlight have alwaysuse. While the use of daylight in homes is not seen as a

  15. CALIFORNIA ENERGY Summary Of Daylighting In Schools

    E-Print Network [OSTI]

    CALIFORNIA ENERGY COMMISSION Summary Of Daylighting In Schools: Reanalysis Report ReanalysisConocha of Federated Departments, Jim Van Dame of My-Lite Daylighting Systems and Products, Doug Gehring of Celotex

  16. Daylighting Application and Effectiveness in Industrial Facilities 

    E-Print Network [OSTI]

    McCowan, B.; Birleanu, D.

    2005-01-01T23:59:59.000Z

    artificial lighting became available, most older industrial buildings had their daylighting features boarded over. With modern glazing systems and sophisticated designs that minimize glare issues, daylighting for industrial buildings is making a strong...

  17. The use of daylight in the design of a controlled environment for food production in the Caribbean and other equatorial climates

    E-Print Network [OSTI]

    Charles, Curtis B

    1989-01-01T23:59:59.000Z

    This thesis addresses the use of daylight in the design of a controlled environment for food production in the Caribbean and other Equatorial climates. An expanding population has put a tremendous burden on the food ...

  18. Daylighting Calculation in DOE-2

    E-Print Network [OSTI]

    Winkelmann, F.C

    2013-01-01T23:59:59.000Z

    4 2.3 Daylight46 3.2.1 Exterior Daylight Availabilityof Interior Daylight Illuminance . . . . . . . . . . ..21

  19. Walking on daylight : the application of translucent floor systems as a means of achieving natural daylighting in mid and low rise architecture

    E-Print Network [OSTI]

    Widder, James

    1985-01-01T23:59:59.000Z

    This thesis is concerned with the introduction of quality daylight to buildings by means of translucency in the horizontal planes or floors within the building. Since people began to build, the concept of translucency in ...

  20. Demonstration with Energy and Daylighting Assessment of Sunlight Responsive Thermochromic (SRT) Window Systems

    SciTech Connect (OSTI)

    Broekhuis, Michael; Liposcak, Curtis; Witte, Michael; Henninger, Robert; Zhou, Xiaohui; Petzen, George; Buchanan, Michael; Kumar, Sneh

    2012-03-31T23:59:59.000Z

    Pleotint, LLC was able to successfully extrude thermochromic interlayer for use in the fenestration industry. Pleotint has developed a thermochromic sytem that requires two thermochromic colors to make a neutral color when in the tinted state. These two colors were assembled into a single interlayer called a tri-layer prelam by Crown Operations for use in the glass lamination industry. Various locations, orientations, and constructions of thermochromic windows were studied with funds from this contract. Locations included Australia, California, Costa Rica, Indiana, Iowa, Mexico. Installed orientations included vertical and skylight glazing applications. Various constructions included monolithic, double pane, triple pane constructions. A daylighting study was conducted at LinEl Signature. LinEl Signature has a conference room with a sylight roof system that has a west orientation. The existing LinEl Signature conference room had constant tint 40% VLT transparent skylights. Irradiance meters were installed on the interior and exterior sides of a constant tint skylight. After a month and a half of data collection, the irradiance meters were removed and the constant tint skylights were replaced with Pleotint thermochromic skylight windows. The irradiance meters were reinstalled in the same locations and irradiance data was collected. Both data sets were compared. The data showed that there was a linear relationship with exterior and interior irradiance for the existing constant tint skylights. The thermochromic skylights have a non-linear relationship. The thermochromic skylights were able to limit the amount of irradiance that passed through the thermochromic skylight. A second study of the LinEl Signature conference was performed using EnergyPlus to calculate the amount of Illuminance that passed through constant tint skylights as compared to thermochromic skylights. The constant tint skylights transmitted Illuminance is 2.8 times higher than the thermochromic skylights during the months of May, June, July, August and 1.9 times higher than the thermochromic skylight during the months of March, April, September, October. Calculated illuminance levels were much more consistent as compared to the existing constant tint skylights installed at LinEl Signature. This allows for a more comfortable interior space in regard to glare discomfort and interior lighting control. Lawrence Berkeley National Laboratory was contracted to characterize the performance of the thermochromic interlayer and thermochromic window systems. Thermochromic interlayer was characterized with spectrometer equipment. The thermochromic window systems were characterized using LBNL’s Advanced Window Test Facility. A copy of the report can be found in the Appendix. Iowa State University was contracted to compare thermochromic window technology to constant tint technology. Iowa State University conducted the testing at the Energy Resource Station (ERS). The ERS has the ability to simultaneously test side-by-side competing building technologies. The building is equipped with two identical air handling units, each with its own dedicated and identical chiller. One air handling unit supplies the four test rooms designated as the A rooms and the other unit serves the four test rooms designated as the B rooms. There is one A test room and one B test rooms arranged as pairs in a side-by-side design with each pair having a different exposure. There is a pair of test rooms that face the south, an east and west facing pair. Each of the test rooms is a mirror image of its match with identical construction. The rooms are unoccupied; however, the capability to impose false loads on the rooms exists. The false loads and room lighting can be scheduled to simulate various usage patterns. A copy of the report can be found in the Appendix. GARD Analytics was contracted to compare EnergyPlus building simulations to the data recorded at the Iowa ERS. The goal of this research was to validate the building simulation software developed by the US Department of Energy. EnergyPlus is

  1. Daylighting Calculation in DOE-2

    E-Print Network [OSTI]

    Winkelmann, F.C

    2013-01-01T23:59:59.000Z

    the sequence: d. space reference point exterior wall windowsystem (BCS). space system to Begin Exterior Wall Loop (1)least one daylit space. 3.2.1 Exterior Daylight Availability

  2. DAYLIGHTING DIRECTORY 1/1980

    E-Print Network [OSTI]

    ,

    2012-01-01T23:59:59.000Z

    shell for passive heating or cooling and daylight. -To consider daylight as having a major contribution inStr. 'NARY PROVIDING A DAYLIGHT ANALYSIS SERVICE USING

  3. A validation of the Radiance three-phase simulation method for modeling annual daylight performance of optically-complex fenestration systems

    E-Print Network [OSTI]

    McNeil, Andrew

    2013-01-01T23:59:59.000Z

    J. , 2011. Simulating the Daylight Performance of Complexof dynamic RADIANCE-based daylight simulations for a testS.E. , 1998. Energy and Daylight Performance of Angular

  4. The New York Times headquarters daylighting mockup: Monitored performance of the daylighting control system

    E-Print Network [OSTI]

    Lee, Eleanor S.; Selkowitz, Stephen E.

    2006-01-01T23:59:59.000Z

    W, respectively. Lighting power density at full power levelssavings and average lighting power density savings for astandard deviation Lighting power density at full power:

  5. Evaluation of Lightshelf Daylighting Systems for Office Buildings in Hot Climates

    E-Print Network [OSTI]

    Abdulmohsen, A.; Boyer, L. L.; Degelman, L. O.

    1994-01-01T23:59:59.000Z

    and heat by shading view apertures below the shelf to reduce solar heat gain and glare and by reflecting light deep into the space through the daylight aperture above the shelf. It also investigates how to provide view with good interior lighting in terms...

  6. Light and Energy -Daylight measurements

    E-Print Network [OSTI]

    Light and Energy - Daylight measurements #12;Light and Energy - Daylight measurements Authors: Jens;3 Title Light and Energy Subtitle Daylight measurements Authors Jens Christoffersen, Ásta Logadóttir ........................................................................................................ 5 Daylight quantity

  7. MANDATORY MEASURES DAYLIGHTING

    E-Print Network [OSTI]

    California at Davis, University of

    MANDATORY MEASURES DAYLIGHTING Reference: Sub-Chapter 4, Section 130.1(d) #12;SECTION 4 MINIMUM DAYLIGHTING FOR LARGE SPACES Large enclosed spaces, such as large retail warehouses, are required to have a minimum amount of daylight available when using the prescriptive method of compliance. The minimum

  8. Daylighting control performance of a thin-film ceramic electrochromic window: Field study results

    SciTech Connect (OSTI)

    Lee, E.S.; DiBartolomeo, D.L.; Selkowitz, S.E.

    2005-01-26T23:59:59.000Z

    Control system development and lighting energy monitoring of ceramic thin-film electrochromic (EC) windows were initiated at the new full-scale window systems test-bed facility at the Lawrence Berkeley National Laboratory (LBNL) in Berkeley, CA. The new facility consists of three identically configured side-by-side private offices with large-area windows that face due south. In one room, an array of EC windows with a center-of-glass visible transmittance T_v range of 0.05-0.60 was installed. In the two other rooms, unshaded windows with a T_v = 0.50 or 0.15 were used as reference. The same dimmable fluorescent lighting system was used in all three rooms. This study explains the design and commissioning of an integrated EC window-lighting control system, and then illustrates its performance in the test-bed under clear, partly cloudy, and overcast sky conditions during the equinox period. The performance of an early prototype EC window controller is also analyzed. Lighting energy savings data are presented. Daily lighting energy savings were 44-59% compared to the reference window of T_v = 0.15 and 8-23% compared to the reference window of T_v = 0.50. The integrated window-lighting control system maintained interior illuminance levels to within +/- 10% of the setpoint range of 510-700 lx for 89-99% of the day. Further work is planned to refine the control algorithms and monitor cooling load, visual comfort, and human factor impacts of this emerging technology. (author)

  9. DAYLIGHTING METRICS FOR RESIDENTIAL BUILDINGS

    E-Print Network [OSTI]

    unknown authors

    It is now widely accepted that the standard method for daylighting evaluation- the daylight factor- is due for replacement with metrics founded on absolute values for luminous quantities predicted over the course of a full year using sun and sky conditions derived from standardised climate files. The move to more realistic measures of daylighting introduces significant levels of additional complexity in both the simulation of the luminous quantities and the reduction of the simulation data to readily intelligible metrics. The simulation component, at least for buildings with standard glazing materials, is reasonably well understood. There is no consensus however on the composition of the metrics, and their formulation is an ongoing area of active research. Additionally, non-domestic and residential buildings present very different evaluation scenarios and it is not yet clear if a single metric would be applicable to both. This study uses a domestic dwelling as the setting to investigate and explore the applicability of daylighting metrics for residential buildings. In addition to daylighting provision for task and disclosing the potential for reducing electric lighting usage, we also investigate the formulation of metrics for non-visual effects such as entrainment of the circadian system.

  10. Daylighting a Green High School Smart Schools Symposium 2013

    E-Print Network [OSTI]

    California at Davis, University of

    Daylighting a Green High School Smart Schools Symposium 2013 #12;AMERICAN CANYON HIGH SCHOOL NAPA CHPS Verified School in CA Daylighting a major focus of sustainable design strategy Began design and orientations First and second story Goals: best daylighting possible flexible lighting system simple and cost

  11. Inferring Architectural Designs from Physical Sketches: Application to Daylighting Analysis

    E-Print Network [OSTI]

    Varela, Carlos

    Inferring Architectural Designs from Physical Sketches: Application to Daylighting Analysis Barbara and a closed, 3D triangle mesh representation is constructed. We apply the system to architectural daylighting, daylighting analy- sis, and image processing. ACM Classification Keywords H.5.1 Information Interfaces

  12. Energy 101: Daylighting

    Office of Energy Efficiency and Renewable Energy (EERE)

    Daylighting—the use of windows or skylights for natural lighting and temperature regulation—is one building strategy that can save money for homeowners and businesses.

  13. Daylight in Guinea-Bissau

    E-Print Network [OSTI]

    Hall, Hiram

    1975-01-01T23:59:59.000Z

    MYLIGfi Iii GJU£A-BISSAU by HIRAM HALL daylightdaylight of dawning dextrose of my goad the rapidsdreams of~ soul. daylight daylight of my dawning may i wrap

  14. ACCEPTANCE REQUIREMENTS AND HOME ENERGY RATING SYSTEMS

    E-Print Network [OSTI]

    ................................................................................................. NJ-5 NJ.6. Lighting Control Systems ........................................................................................................... NJ-6 NJ.6.1 Automatic Daylighting Controls Acceptance ........................................................................... NJ-9 NJ.6.4 Automatic Time Switch Control Acceptance

  15. Energy 101: Daylighting

    SciTech Connect (OSTI)

    None

    2011-01-01T23:59:59.000Z

    Daylighting—the use of windows or skylights for natural lighting and temperature regulation—is one building strategy that can save money for homeowners and businesses. Highly efficient, strategically placed windows maximize the use of natural daylight in a building, lowering the need for artificial lighting without causing heating or cooling problems.

  16. Energy 101: Daylighting

    ScienceCinema (OSTI)

    None

    2013-05-29T23:59:59.000Z

    Daylighting?the use of windows or skylights for natural lighting and temperature regulation?is one building strategy that can save money for homeowners and businesses. Highly efficient, strategically placed windows maximize the use of natural daylight in a building, lowering the need for artificial lighting without causing heating or cooling problems.

  17. Focus group discussions of daylighting practices

    SciTech Connect (OSTI)

    Roberson, B.F.; Harkreader, S.A.

    1988-11-01T23:59:59.000Z

    This research was sponsored by the US Department of Energy (DOE) Office of Buildings and Community systems and conducted by Pacific Northwest Laboratory (PNL) as part of an ongoing effort to enhance the commercial use of federally developed technologies. One such technology is the use of daylighting practices in the design of nonresidential buildings. This document is a report of the findings from meetings of focus groups conducted to gain insight into building designers' perceptions and attitudes about daylighting systems.

  18. Lighting energy savings potential of split-pane electrochromic windows controlled for daylighting with visual comfort

    SciTech Connect (OSTI)

    Software, Anyhere; Fernandes, Luis; Lee, Eleanor; Ward, Greg

    2013-03-15T23:59:59.000Z

    A simulation study was conducted to evaluate lighting energy savings of split-pane electrochromic (EC) windows controlled to satisfy key visual comfort parameters. Using the Radiance lighting simulation software, interior illuminance and luminance levels were computed for a south-facing private office illuminated by a window split into two independently-controlled EC panes. The transmittance of these was optimized hourly for a workplane illuminance target while meeting visual comfort constraints, using a least-squares algorithm with linear inequality constraints. Blinds were successively deployed until visual comfort criteria were satisfied. The energy performance of electrochromics proved to be highly dependent on how blinds were controlled. With hourly blind position adjustments, electrochromics showed significantly higher (62percent and 53percent, respectively without and with overhang) lighting energy consumption than clear glass. With a control algorithm designed to better approximate realistic manual control by an occupant, electrochromics achieved significant savings (48percent and 37percent, respectively without and with overhang). In all cases, energy consumption decreased when the workplace illuminance target was increased. In addition, the fraction of time during which the occupant had an unobstructed view of the outside was significantly greater with electrochromics: 10 months out of the year versus a handful of days for the reference case.

  19. Daylighting, dimming, and the electricity crisis in California

    SciTech Connect (OSTI)

    Rubinstein, Francis; Neils, Danielle; Colak, Nesrin

    2001-09-17T23:59:59.000Z

    Dimming controls for electric lighting have been one of the mainstays of the effort to use daylighting to reduce annual lighting energy consumption. The coincidence of daylighting with electric utility peak demand makes daylighting controls an effective strategy for reducing commercial building peak electric loads. During times of energy shortage, there is a greatly increased need to reduce electricity use during peak periods, both to ease the burden on electricity providers and to control the operating costs of buildings. The paper presents a typical commercial building electric demand profile during summer, and shows how daylighting-linked lighting controls and load shedding techniques can reduce lighting at precisely those times when electricity is most expensive. We look at the importance of dimming for increasing the reliability of the electricity grid in California and other states, as well as examine the potential cost-effectiveness of widespread use of daylighting to save energy and reduce monthly electricity bills.

  20. DAYLIGHTING DIRECTORY 1/1980

    E-Print Network [OSTI]

    ,

    2012-01-01T23:59:59.000Z

    Lighting Design and ~ylight:ing and Passive Solar Buildin. ~Design and Applications, Febo and Kiarch, 1979. "Daylighting and Passive SolarPassive Solar Conference, pp. 271 - 281, January 1979. TERNOEY, STEVEN "Daylighting Design

  1. adaptive control scheme: Topics by E-print Network

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

    systems concepts. Based Alpcan, Tansu 5 Adaptive predictive lighting controllers for daylight artificial light integrated schemes. Open Access Theses and Dissertations Summary:...

  2. DELIGHT2 DAYLIGHTING ANALYSIS IN ENERGY PLUS: INTEGRATION AND PRELIMINARY USER RESULTS

    E-Print Network [OSTI]

    DELIGHT2 DAYLIGHTING ANALYSIS IN ENERGY PLUS: INTEGRATION AND PRELIMINARY USER RESULTS William L for daylight and electric lighting system analysis in buildings. DElight calculates interior illuminance levels from daylight, and the subsequent contribution required from electric lighting to meet a desired

  3. The following VS tools were compared: 2D OPENBABEL, DAYLIGHT2

    E-Print Network [OSTI]

    Ritchie, Dave

    The following VS tools were compared: 2D ­ OPENBABEL, DAYLIGHT2 , MACCS. BCI, MOLPRINT2D3 3D ­ ROCS Software Inc., Cepos Insilico Ltd., Chemical Computing Group, DAYLIGHT, Chemical Information Systems and Digital Chemistry for providing Academic Licences for ROCS, ParaSurf, MOE, DAYLIGHT, and BCI, respectively

  4. Using Simple Light Sensors to Achieve Smart Daylight Harvesting Jiakang Lu, Dagnachew Birru, Kamin Whitehouse

    E-Print Network [OSTI]

    Whitehouse, Kamin

    Using Simple Light Sensors to Achieve Smart Daylight Harvesting Jiakang Lu, Dagnachew Birru, Kamin demonstrate how to improve the effectiveness of daylight harvesting with a sin- gle light sensor on each sky to predict the incoming daylight and set window transparency accordingly. We evaluate our system

  5. Empirical assessment of a prismatic daylight-redirecting window film in a full-scale office

    E-Print Network [OSTI]

    LBNL-6496E Empirical assessment of a prismatic daylight- redirecting window film in a full in Leukos, the journal of the IESNA. Empirical assessment of a prismatic daylight- redirecting window film Laboratory, Mailstop 90-3111, 1 Cyclotron Road, Berkeley, CA 94720 USA Abstract Daylight redirecting systems

  6. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2012-01-01T23:59:59.000Z

    quantitative performance indicators of daylight sufficiency?assumptions of existing daylighting performance indicators.existing daylight performance indicators overestimated the

  7. Daylight operation of a free space, entanglement-based quantum key distribution system

    E-Print Network [OSTI]

    Peloso, Matthew P; Ho, Caleb; Lamas-Linares, Antia; Kurtsiefer, Christian

    2008-01-01T23:59:59.000Z

    Many quantum key distribution (QKD) implementations using a free space transmission path are restricted to operation at night time in order to distinguish the signal photons used for a secure key establishment from background light. Here, we present a lean entanglement-based QKD system overcoming that imitation. By implementing spectral, spatial and temporal filtering techniques, we were able to establish a secure key continuously over several days under varying light and weather conditions.

  8. Daylight operation of a free space, entanglement-based quantum key distribution system

    E-Print Network [OSTI]

    Matthew P. Peloso; Ilja Gerhardt; Caleb Ho; Antia Lamas-Linares; Christian Kurtsiefer

    2008-12-10T23:59:59.000Z

    Many quantum key distribution (QKD) implementations using a free space transmission path are restricted to operation at night time in order to distinguish the signal photons used for a secure key establishment from background light. Here, we present a lean entanglement-based QKD system overcoming that imitation. By implementing spectral, spatial and temporal filtering techniques, we were able to establish a secure key continuously over several days under varying light and weather conditions.

  9. Daylighting Calculation in DOE-2

    E-Print Network [OSTI]

    Winkelmann, F.C

    2013-01-01T23:59:59.000Z

    46 3.2.2 Luminous Efficacy of Solar Radiation . . . . . . .The Availability of Solar Radiation. and Daylight",incidence TSOLNM for solar radiation. TSOLDF =

  10. Daylighting Islais Creek : a feasibility study

    E-Print Network [OSTI]

    Jencks, Rosey; Leonardson, Rebecca

    2004-01-01T23:59:59.000Z

    for daylighting the creek and other green infrastructure.Daylighting Islais Creek for stormwater conveyance wouldGlen Park Cayuga Islais Creek Runoff Elev. Slope coeff.

  11. Daylighting | 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model,DOE Facility Database DataDatatechnic InternationalMontana:Heights,Daylighting

  12. DAYLIGHTING METRICS: IS THERE A RELATION BETWEEN USEFUL DAYLIGHT ILLUMINANCE AND DAYLIGHT GLARE PROBABILITY?

    E-Print Network [OSTI]

    J. Mardaljevic; M. Andersen; N. Roy; J. Christoffersen

    The establishment of climate-based daylight modelling within research and practice has led to a fundamental reassessment of both the basis and purpose of daylight metrics. Whilst there is no consensus yet on the precise nature of the metric(s) that should replace the daylight factor, it is generally agreed that these should be founded on climate-based daylight modelling (CBDM). In this paper we examine the relation between the predicted annual occurrence of glare and one of the candidate CBDM metrics that has been proposed, called useful daylight illuminance (UDI). The purpose is to determine if one or more of the UDI metrics (predicted for the horizontal workplane) could serve as a proxy for the probability of daylight glare (i.e. a measure of vertical illuminance received at the eye). For glare we use the simplified daylight glare probability model. The setting is a residential building which we use as a ‘virtual laboratory ’ in two design configurations, each evaluated under all 32 combinations of 8 European climates and 4 building orientations.

  13. CALCULATING INTERIOR DAYLIGHT ILLUMINATION WITH A PROGRAMMABLE HAND CALCULATOR

    E-Print Network [OSTI]

    Bryan, Harvey J.

    2013-01-01T23:59:59.000Z

    Committee E-3.2, "Daylight: International RecommendationsCalculation of Natural Daylight," CIE PUBLICATION No. 16,Committee E-3.2, "Natural Daylight: Official Recommenda-

  14. CALCULATING INTERIOR DAYLIGHT ILLUMINATION WITH A PROGRAMMABLE HAND CALCULATOR

    E-Print Network [OSTI]

    Bryan, Harvey J.

    2013-01-01T23:59:59.000Z

    Committee E-3.2, "Daylight: International Recommendationsthe Calculation of Natural Daylight, 11 CIE PUBLICATION No.Committee E-3.2 1 "Natural Daylight: Official Recommenda-

  15. UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging

    E-Print Network [OSTI]

    Buckingham, Michael

    UNIVERSITY OF CALIFORNIA, SAN DIEGO Acoustic Daylight: passive acoustic imaging using ambient noise ............................................................................................... xviii SECTION 1: INTRODUCTION Chapter 1: Acoustic Daylight......................................................................... 1 1.2 Acoustic Daylight

  16. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2011-01-01T23:59:59.000Z

    of Task 21 / Annex 29, Daylight in Buildings. October, 1997.Energy performance of daylight-linked automatic lightingBegemann, G. et al. (1997). Daylight, artificial light and

  17. Simulation-based assessment of the energy savings benefits of integrated control in office buildings

    E-Print Network [OSTI]

    Hong, T.

    2011-01-01T23:59:59.000Z

    Control System. Energy and Buildings 33(2001): 477-487.control system. Energy and Buildings Lee ES, Yazdanian M ,Daylight Controls. Energy and Buildings 33(2001): 793-803.

  18. Improving the performance of photo-electrically controlled lighting systems

    SciTech Connect (OSTI)

    Rubinstein, F.; Ward, G.; Verderber, R.

    1988-08-01T23:59:59.000Z

    The ability of a photo-electrically controlled lighting system to maintain a constant total light level on a task surface by responding to changing daylight levels is affected by the control algorithm used to relate the photosensor signal to the supplied electric light level and by the placement and geometry of the photosensor. We describe the major components of a typical control system, discuss the operation of three different control algorithms, and derive expressions for each algorithm that express the total illuminance at the task as a function of the control photosensor signal. Using a specially-designed scale model, we measured the relationship between the signal generated by various ceiling-mounted control photosensors and workplane illuminance for two room geometries under real sky conditions. The measured data were used to determine the performance of systems obeying the three control algorithms under varying daylight conditions. Control systems employing the commonly-used integral reset algorithm supplied less electric light than required, failing to satisfy the control objective regardless of the control photosensor used. Systems employing an alternative, closed-loop proportional control algorithm achieved the control objective under virtually all tested conditions when operated by a ceiling-mounted photosensor shielded from direct window light.

  19. 4.430 Daylighting, Fall 2006

    E-Print Network [OSTI]

    Andersen, Marilyne

    This class provides the tools necessary for an efficient integration of daylighting issues in the overall design of a building. The fundamentals of daylighting and electric lighting are introduced and their relevance to ...

  20. Fall Back Daylight Savings time is November

    E-Print Network [OSTI]

    Linsley, Braddock K.

    Fall Back ­ Daylight Savings time is November 2nd.The Energy Policy Act of 2005 changed both the starting and ending dates. Beginning in 2007, daylight time starts on the second Sunday in March and ends

  1. Daylight metrics and energy savings J. Mardaljevic

    E-Print Network [OSTI]

    LBNL-4585E Daylight metrics and energy savings Authors: J. Mardaljevic Institute of Energy 2009; 0: 1­23 ! Daylight metrics and energy savings J. Mardaljevic a , L. Heschong b , E.S. Lee c comfort performance. Current metrics do not account for the temporal and spatial aspects of daylight, nor

  2. I Color recognition models of daylight illumi-

    E-Print Network [OSTI]

    Draper, Bruce A.

    I Color recognition models of daylight illumi- nation and hybrid reflectance, and predicts of the color of ob- jects with respect to existing models of daylight [12] and surface reflectance [17, 14, 211 a surface reflectance model for hybrid surfaces and a context-based model of daylight illumination

  3. A SIMPLIFIED PROCEDURE FOR CALCULATING THE EFFECTS OF DAYLIGHT FROM CLEAR SKIES

    E-Print Network [OSTI]

    Bryan, Harvey J.

    2012-01-01T23:59:59.000Z

    J. , "The Calculation of Daylight Factor for Clear Skyand Predetermination of Daylight Illumination," ILLUMINATINGA MEASURING DIAGRAM FOR DAYLIGHT ILLUMINATION, Batsford,

  4. Does Extending Daylight Saving Time Save Energy? Evidence from an Australian Experiment

    E-Print Network [OSTI]

    KELLOGG, RYAN M; Wolff, Hendrik

    2007-01-01T23:59:59.000Z

    Tellier, F. (2005): Daylight Saving Time and EnergyCEC, 2001: Effects of Daylight Saving Time on California2004): The effects of daylight and daylight saving time on

  5. Investigating Daylight Quality In Malaysian Government Office Buildings Through Daylight Factor

    E-Print Network [OSTI]

    Surface Luminance; Mohd Zin K; Mohd Sabere Sulaiman; Yong Razidah Rashid; Dilshan Remaz Ossen; Aminatuzuhariah M; Lim Yaik Wah; Mansour Nikpour

    Abstract—In recent years, there has been an increasing interest in using daylight to save energy in buildings. In tropical regions, daylighting is always an energy saver. On the other hand, daylight provides visual comfort. According to standards, it shows that many criteria should be taken into consideration in order to have daylight utilization and visual comfort. The current standard in Malaysia, MS 1525 does not provide sufficient guideline. Hence, more research is needed on daylight performance. If architects do not consider daylight design, it not only causes inconvenience in working spaces but also causes more energy consumption as well as environmental pollution. This research had surveyed daylight performance in 5 selected office buildings from different area of Malaysian through experimental method. Several parameters of daylight quality such as daylight factor, surface luminance and surface luminance ratio were measured in different rooms in each building. The result of this research demonstrated that most of the buildings were not designed for daylight utilization. Therefore, it is very important that architects follow the daylight design recommendation to reduce consumption of electric power for artificial lighting while the sufficient quality of daylight is available. Keywords—Daylight factor, Field measurement, Daylighting quality, Tropical

  6. THE DAYLIGHTING SOLUTION

    E-Print Network [OSTI]

    Selkowitz, Stephen

    2013-01-01T23:59:59.000Z

    sho\\l'rooms. Use of solar energy for thermal control insolar applications in buildings has focused on providing thermal energy

  7. Analysis of Daylighting Requirements within ASHRAE Standard 90.1

    SciTech Connect (OSTI)

    Athalye, Rahul A.; Xie, YuLong; Liu, Bing; Rosenberg, Michael I.

    2013-08-01T23:59:59.000Z

    Pacific Northwest National Laboratory (PNNL), under the Building Energy Codes Program (BECP) funded by U.S. Department of Energy (DOE), provides support to the ASHRAE/IES/IESNA Standard 90.1(Standard 90.1) Standing Standards Project Committee (SSPC 90.1) and its subcommittees. In an effort to provide the ASHRAE SSPC 90.1 with data that will improve the daylighting and fenestration requirements in the Standard, PNNL collaborated with Heschong Mahone Group (HMG), now part of TRC Solutions. Combining EnergyPlus, a whole-building energy simulation software developed by DOE, with Radiance, a highly accurate illumination modeling software (Ward 1994), the daylighting requirements within Standard 90.1 were analyzed in greater detail. The initial scope of the study was to evaluate the impact of the fraction of window area compared to exterior wall area (window-to-wall ratio (WWR)) on energy consumption when daylighting controls are implemented. This scope was expanded to study the impact of fenestration visible transmittance (VT), electric lighting controls and daylighted area on building energy consumption.

  8. daylight 12/17/2007 1 Tracking the change in the amount of daylight

    E-Print Network [OSTI]

    Taylor, Peter

    daylight 12/17/2007 1 Tracking the change in the amount of daylight Ever notice that at some times successive days? (c) (Calculus) The daylight graph has been drawn with sine-curve. Find its equation. (d) Use get the following diagram. #12;daylight 12/17/2007 2 0 2 4 6 8 10 12 14 16 18 20 0 20 40 60 80 100 120

  9. Effect of daylighting on energy consumption and daylight quality in an existing elementary school

    E-Print Network [OSTI]

    Atre, Umesh Vinayak

    2005-08-29T23:59:59.000Z

    EFFECT OF DAYLIGHTING ON ENERGY CONSUMPTION AND DAYLIGHT QUALITY IN AN EXISTING ELEMENTARY SCHOOL A Thesis by UMESH VINAYAK ATRE Submitted to the Office of Graduate Studies of Texas A&M University in partial... fulfillment of the requirements for the degree of MASTER OF SCIENCE May 2005 Major Subject: Architecture EFFECT OF DAYLIGHTING ON ENERGY CONSUMPTION AND DAYLIGHT QUALITY IN AN EXISTING ELEMENTARY SCHOOL A...

  10. The Potential of Energy Management and Control Systems for Real-Time Electricity Pricing Programs

    E-Print Network [OSTI]

    Akbari, H.; Heinemeier, K. E.

    1990-01-01T23:59:59.000Z

    and Control System EMCSs are popular in commercial buildings for many reasons [EPRI, 19861. The rapid development and evolution in the computer industry has made more powerful EMCSs available at a lower cost. In new commercial buildings and a majority...-management strategies implemented by EMCSs are: programmed stop and start, duty cycling, demand limiting, optimal stop and start, plant optimization, economizer control, thermal energy storage, and daylighting [EPRI, 1985 & 1986; NCAEC 19871. In addition...

  11. Energy 101: Daylighting | Department of Energy

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

    Highly efficient, strategically placed windows maximize the use of natural daylight in a building, lowering the need for artificial lighting without causing heating or...

  12. Do Daylight-Saving Time Adjustments Really Impact Stock Returns?

    E-Print Network [OSTI]

    Steigerwald, Douglas G; Conte, Marc

    2007-01-01T23:59:59.000Z

    I. Taylor, 1935, World Daylight Saving Time, Chicago: Cur-Sleep at the Market: The Daylight Saving Anomaly”, AmericanSleep at the Market: The Daylight Saving Anomaly: Reply”,

  13. Integrated Daylight Harvesting and Occupancy Detection Using Digital Imaging

    E-Print Network [OSTI]

    Salvaggio, Carl

    Integrated Daylight Harvesting and Occupancy Detection Using Digital Imaging Abhijit Sarkar dynamic range CMOS video camera to integrate daylight harvesting and occupancy sensing functionalities by these sensors. The prototype involves three algorithms, daylight estimation, occupancy detection and lighting

  14. June 1998Program Description Windows and Daylighting Group

    E-Print Network [OSTI]

    June 1998Program Description THERM 2.0 Windows and Daylighting Group Building Technologies, and Dariush Arasteh Windows and Daylighting Group Building Technologies Department Environmental Energy

  15. A Practical Analytic Model for Daylight Category: research

    E-Print Network [OSTI]

    Shirley, Peter

    A Practical Analytic Model for Daylight Category: research Abstract Sunlight and skylight that approximates full spectrum daylight for various atmospheric con­ ditions. These conditions are parameterized

  16. A Practical Analytic Model for Daylight Category: research

    E-Print Network [OSTI]

    Shirley, Peter

    A Practical Analytic Model for Daylight Category: research Abstract Sunlight and skylight that approximates full spectrum daylight for various atmospheric con- ditions. These conditions are parameterized

  17. Daylight metrics and energy savings

    SciTech Connect (OSTI)

    Mardaljevic, John; Heschong, Lisa; Lee, Eleanor

    2009-12-31T23:59:59.000Z

    The drive towards sustainable, low-energy buildings has increased the need for simple, yet accurate methods to evaluate whether a daylit building meets minimum standards for energy and human comfort performance. Current metrics do not account for the temporal and spatial aspects of daylight, nor of occupants comfort or interventions. This paper reviews the historical basis of current compliance methods for achieving daylit buildings, proposes a technical basis for development of better metrics, and provides two case study examples to stimulate dialogue on how metrics can be applied in a practical, real-world context.

  18. Assessing the Feasibility of Creek Daylighting in San Francisco, Part I: A Synthesis of Lessons Learned from Existing Urban Daylighting Projects

    E-Print Network [OSTI]

    Smith, Brooke Ray

    2007-01-01T23:59:59.000Z

    and Leonardson 2004). Why Daylight? In San Francisco, creekof San Francisco to daylight historical urban creeks withincity governments to daylight urban creeks, with successful

  19. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2011-01-01T23:59:59.000Z

    quantitative performance indicators of daylight sufficiency?set of daylighting performance indicators for examination inassumptions of performance indicators under real work

  20. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2012-01-01T23:59:59.000Z

    quantitative performance indicators of daylight sufficiency?set of daylighting performance indicators for examination inassumptions of performance indicators under real work

  1. Daylighting techniques used in indigenous buildings in the United Arab Emirates (UAE), an investigative approach

    E-Print Network [OSTI]

    Alnuaimi, Maitha Mohammed

    2009-06-02T23:59:59.000Z

    This study investigated the potential of the daylighting systems used in the indigenous architecture of the United Arab Emirates (UAE), located in Dubai (latitude 25° N longitude 55° E). The analysis tested the lighting performance of three...

  2. Hiding patterns with daylight fluorescent inks

    E-Print Network [OSTI]

    Romain Rossier; Roger D. Hersch; School Of Computer; Communication Sciences; Ecole Polytechnique; Fédérale Lausanne

    We propose a method for hiding patterns within printed images by making use of classical and of two daylight fluorescent magenta and yellow inks. Under the D65 illuminant we establish in the CIELAB space the gamut of a classical cmyk printer and the gamut of the same printer using a combination of classical inks with daylight fluorescent inks. These gamuts show that a significant part of the classical ink gamut can be reproduced by combining classical inks with daylight fluorescent inks. By printing parts of images with a combination of classical and daylight fluorescent inks instead of using classical inks only, we can hide security patterns within printed images. Under normal daylight, we do not see any difference between the parts printed with classical inks only and the parts printed with daylight fluorescent inks and classical inks. By changing the illumination, e.g. by viewing the printed image under a tungsten lamp or under a UV lamp, the daylight fluorescent inks change their colors and reveal the security pattern formed by combinations of classical inks and of daylight fluorescent inks.

  3. SBi 2006:08 Assessment of daylight quality

    E-Print Network [OSTI]

    SBi 2006:08 Assessment of daylight quality in simple rooms Impact of three window configurations on daylight conditions, Phase 2 #12;#12;SBi 2006:08 Danish Building Research Institute 2006 Assessment of daylight quality in simple rooms Impact of three window configurations on daylight conditions, Phase 2

  4. Plasma lighting, fiber optics, and daylight collectors: Toward the next revolution in high-efficiency illumination

    SciTech Connect (OSTI)

    Audin, L. [Columbia Univ., New York, NY (United States)

    1995-06-01T23:59:59.000Z

    Combining three recently marketed innovations may provide the next revolution in illumination, making many other recent advances eventually obsolete. The first is plasma lighting, pioneered by Fusion Lighting Inc. of Rockville, Maryland, and first commercially applied by Hutchins International Ltd. of Mississauga, Ontario. This microwave-generated light source yields very high-quality light with efficacies at or beyond high intensity discharge (HID) lamps. The source uses no mercury, thus eliminating lamp disposal problems, and has no cathode, thereby providing very long lamp life. Using no phosphors, it also has very short start and re-strike periods, and is dimmable. The second innovation is in the distribution of light. Commercial developments in fiber optics and light guides now provide products that transfer light from a remote point and distribute it like standard light fixtures. Advances in fiber optic communications and applications to decorative lighting have supplied relatively economical systems for mounting and directing light from both electric light sources and the sun. The third advance is a result of efforts to harness daylight. Unlike architectural daylighting that directs sunlight into perimeter areas through glazing, daylight collectors are roof-mounted devices that supply light to interior and underground spaces through hollow columns and open chases. Aided by improvements and cost reductions in sun-tracking (i.e., heliostatic) controls that capture and concentrate sunlight, such collectors offer a source of free light to locations that might otherwise never receive it. When combined together, these three options could offer a centralized building lighting system that pipes lumens to distribution devices replacing many existing lamps and fixtures.

  5. BONNEVILLE POWER ADMINISTRATION FOR IMMEDIATE RELEASE

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

    controlling lights and air conditioning systems. Other potential applications include daylight harvesting, daylighting system commissioning, occupancy logging and daylight logging,...

  6. Evaluation of Climate-Based Daylight Performance in Tropical Office Buildings- A Case Study

    E-Print Network [OSTI]

    Szu-Cheng, CHIEN; King Jet, TSENG

    2013-01-01T23:59:59.000Z

    and Z. Rogers, Dynamic Daylight Performance Metrics forof interior design on the daylight availability in open plan2002. [14] Z. Rogers, Daylight metric development using

  7. SIMULATION-ASSISTED DAYLIGHT PERFORMANCE ANALYSISIN A HIGH-RISE OFFICE BUILDING IN SINGAPORE

    E-Print Network [OSTI]

    CHIEN, Szu Cheng; TSENG, King Jet

    2013-01-01T23:59:59.000Z

    Flodberg, K. (2013). “Daylight utilisation in perimeterJ. , (2005a). “Useful Daylight Illuminance: A NewParadigm to Access Daylight in Buildings”. Lighting

  8. Does Daylight Saving Time Save Energy? Evidence from a Natural Experiment in Indiana

    E-Print Network [OSTI]

    Kotchen, Matthew J; Grant, Laura E.

    2008-01-01T23:59:59.000Z

    The Energy Impact of Daylight Saving Time Implementation insleep at the market: The daylight saving anomaly. Americansleep at the market: The daylight saving anomaly: Reply.

  9. A PROCEDURE FOR CALCULATING INTERIOR DAYLIGHT ILLUMINATION WITH A PROGRAMMABLE HAND CALCULATOR

    E-Print Network [OSTI]

    Bryan, H.J.

    2010-01-01T23:59:59.000Z

    FOR CALCULATING INTERIOR DAYLIGHT ILLUMINATION WITH ACommittee E-3.2, "Daylight: International RecommendationsCalcula- tion of Natural Daylight," CIE PUBLICATION No. 16,

  10. Performance-based assessment of daylight on tropical buildings- a case Study

    E-Print Network [OSTI]

    Szu Cheng, CHIEN

    2013-01-01T23:59:59.000Z

    81% 81% 95% 96% 74% 68% Daylight autonomy max (DAmax) >5%32% 28% 11% 9% 11% 6% Useful daylight illuminance (UDI) Daylight Performance Metrics for

  11. 4.492 Daylighting, Fall 2004

    E-Print Network [OSTI]

    Andersen, Marilyne

    The course focuses on the use and optimization of daylight in buildings and on its complementarity to artificial (electric) lighting, to aim at reducing the building's environmental impact while improving the visual comfort ...

  12. Daylighting Prediction Software: Comparative Analysis and Application

    E-Print Network [OSTI]

    Estes, J. M. Jr.; Schreppler, S.; Newsom, T.

    2004-01-01T23:59:59.000Z

    in selecting a software program are presented. “Radiance”, a reverse ray tracing method software package, was chosen for use in the simulations. An existing school was modeled with the Radiance software and predictions of daylighting contributions were compared...

  13. Daylighting Application and Effectiveness in Industrial Facilities

    E-Print Network [OSTI]

    McCowan, B.; Birleanu, D.

    2005-01-01T23:59:59.000Z

    during the industrial revolution, architects utilized various daylighting strategies such as window walls, skylighting, monitors, etc. However, glazing technologies were primitive compared with our modern choices, When more efficient and effective...

  14. Thermal Control & System Integration

    Broader source: Energy.gov [DOE]

    The thermal control and system integration activity focuses on issues such as the integration of motor and power control technologies and the development of advanced thermal control technologies....

  15. LIFE-CYCLE COST AND ENERGY-USE ANALYSIS OF SUN-CONTROL AND DAYLIGHTING OPTIONS IN A HIGH-RISE OFFICE BUILDING

    E-Print Network [OSTI]

    Winkelmann, Frederick C.

    2014-01-01T23:59:59.000Z

    LIFE-CYCLE COST AND ENERGY-USE ANALYSIS OF SUN-CONTROL AND4 LIFE-CYCLE COST AND ENERGY-USE ANALYSIS OF SUN-CONTROL ANDLIFE-CYCLE COST AND ENERGY-USE ANALYSIS OF SUN-CONTROL AND

  16. On the Use of Integrated Daylighting and Energy Simulations to Drive the Design of a Large Net-Zero Energy Office Building: Preprint

    SciTech Connect (OSTI)

    Guglielmetti, R.; Pless, S.; Torcellini, P.

    2010-08-01T23:59:59.000Z

    This paper illustrates the challenges of integrating rigorous daylight and electric lighting simulation data with whole-building energy models, and defends the need for such integration to achieve aggressive energy savings. Through a case study example, we examine the ways daylighting -- and daylighting simulation -- drove the design of a large net-zero energy project. We give a detailed review of the daylighting and electric lighting design process for the National Renewable Energy Laboratory's Research Support Facility (RSF), a 220,000 ft2 net-zero energy project the author worked on as a daylighting consultant. A review of the issues involved in simulating and validating the daylighting performance of the RSF will be detailed, including daylighting simulation, electric lighting control response, and integration of Radiance simulation data into the building energy model. Daylighting was a key strategy in reaching the contractual energy use goals for the RSF project; the building's program, layout, orientation and interior/furniture design were all influenced by the daylighting design, and simulation was critical in ensuring these many design components worked together in an integrated fashion, and would perform as required to meet a very aggressive energy performance goal, as expressed in a target energy use intensity.

  17. Control system design method

    DOE Patents [OSTI]

    Wilson, David G. (Tijeras, NM); Robinett, III, Rush D. (Tijeras, NM)

    2012-02-21T23:59:59.000Z

    A control system design method and concomitant control system comprising representing a physical apparatus to be controlled as a Hamiltonian system, determining elements of the Hamiltonian system representation which are power generators, power dissipators, and power storage devices, analyzing stability and performance of the Hamiltonian system based on the results of the determining step and determining necessary and sufficient conditions for stability of the Hamiltonian system, creating a stable control system based on the results of the analyzing step, and employing the resulting control system to control the physical apparatus.

  18. FREE-SPACE QUANTUM CRYPTOGRAPHY IN DAYLIGHT

    SciTech Connect (OSTI)

    Hughes, R.J.; Buttler, W.T. [and others

    2000-01-01T23:59:59.000Z

    Quantum cryptography is an emerging technology in which two parties may simultaneously generate shared, secret cryptographic key material using the transmission of quantum states of light. The security of these transmissions is based on the inviolability of the laws of quantum mechanics and information-theoretically secure post-processing methods. An adversary can neither successfully tap the quantum transmissions, nor evade detection, owing to Heisenberg's uncertainty principle. In this paper we describe the theory of quantum cryptography, and the most recent results from our experimental free-space system with which we have demonstrated for the first time the feasibility of quantum key generation over a point-to-point outdoor atmospheric path in daylight. We achieved a transmission distance of 0.5 km, which was limited only by the length of the test range. Our results provide strong evidence that cryptographic key material could be generated on demand between a ground station and a satellite (or between two satellites), allowing a satellite to be securely re-keyed on orbit. We present a feasibility analysis of surface-to-satellite quantum key generation.

  19. Monitored Energy Performance of Electrochromic Windows Controlledfor Daylight and Visual Comfort

    SciTech Connect (OSTI)

    Lee, Eleanor S.; DiBartolomeo, Dennis L.; Klems, Joseph; Yazdanian, Mehry; Selkowitz, Stephen E.

    2005-09-23T23:59:59.000Z

    A 20-month field study was conducted to measure the energy performance of south-facing large-area tungsten-oxide absorptive electrochromic (EC) windows with a broad switching range in a private office setting. The EC windows were controlled by a variety of means to bring in daylight while minimizing window glare. For some cases, a Venetian blind was coupled with the EC window to block direct sun. Some tests also involved dividing the EC window wall into zones where the upper EC zone was controlled to admit daylight while the lower zone was controlled to prevent glare yet permit view. If visual comfort requirements are addressed by EC control and Venetian blinds, a 2-zone EC window configuration provided average daily lighting energy savings of 10 {+-} 15% compared to the reference case with fully lowered Venetian blinds. Cooling load reductions were 0 {+-} 3%. If the reference case assumes no daylighting controls, lighting energy savings would be 44 {+-} 11%. Peak demand reductions due to window cooling load, given a critical demand-response mode, were 19-26% maximum on clear sunny days. Peak demand reductions in lighting energy use were 0% or 72-100% compared to a reference case with and without daylighting controls, respectively. Lighting energy use was found to be very sensitive to how glare and sun is controlled. Additional research should be conducted to fine-tune EC control for visual comfort based on solar conditions so as to increase lighting energy savings.

  20. Abstract A Hierarchical Algorithm for Radiosity Daylighting

    E-Print Network [OSTI]

    Gonzalo Besuievsky; Ignacio Martin

    A new daylight simulation method for radiosity environments is presented. Daylight illumination is transported in a first step where sun and sky are represented as a set of directional sources. Light is transported using parallel projections of these sources. The scene mesh is adaptively subdivided using energy and visibility criteria obtained from a extended scan-line algorithm that computes a layered depth image for each projection. In a second step, diffuse intereflection is computed through a hierarchical Monte Carlo radiosity algorithm. The method is feasible for it extension for environments containing specular surfaces. Relative short time view-independent global illumination results can be obtained with the proposed method, which make it suitable for daylight building design and analysis applications for both indoors and outdoors environments. 1

  1. To be submitted to Solar Energy. Daylight performance of a microstructured prismatic window film in deep open

    E-Print Network [OSTI]

    To be submitted to Solar Energy. Daylight performance of a microstructured prismatic window film Systems Department, Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory with vertical windows have the potential to offset lighting energy use in deep perimeter zones

  2. Building Information Modeling (BIM)-Based Daylighting Simulation and Analysis 

    E-Print Network [OSTI]

    Kota, S.; Haberl, J.S.; Clayton, M.; Yan, W.

    2014-01-01T23:59:59.000Z

    will be converted into daylighting models to run on the daylighting simulation engines. Once the architect defines the architectural model in CAD, a simulation expert creates the simulation input file to perform daylighting analysis. Each tool has its own way... the Radiance input file is created, different Radiance utilities are called using MS Windows BATCH scripting for doing a daylighting analysis [15]. In addition to AutoCAD, Radiance also has many utility programs that help in converting different geometry...

  3. Building Information Modeling (BIM)-Based Daylighting Simulation and Analysis

    E-Print Network [OSTI]

    Kota, S.; Haberl, J.S.; Clayton, M.; Yan, W.

    tools Radiance and DAYSIM. Keywords: Building Information Modeling, BIM, Daylighting Simulation, Radiance, DAYSIM 1 Introduction Building performance analyses are important aspects of designing sustainable buildings. One of the performance analyses...) with daylighting analysis tools (Radiance and DAYSIM as sample simulation tools, which are widely used to study the daylighting performance of buildings). 2 Literature review 2.1 Daylighting simulation tools Over the years many analysis tools have been...

  4. A Spatially Augmented Reality Sketching Interface for Architectural Daylighting Design

    E-Print Network [OSTI]

    Varela, Carlos

    1 A Spatially Augmented Reality Sketching Interface for Architectural Daylighting Design Yu Sheng to architectural daylight modeling that allows designers to explore alternative designs and new technologies are then projected on the real model by four calibrated projectors to help users study the daylighting illumination

  5. Quantifying the Impact of Daylight Saving Clock Changes

    E-Print Network [OSTI]

    Hill, Simon I.

    Quantifying the Impact of Daylight Saving Clock Changes on Energy Consumption Simon I. Hill of Daylight Saving Clock Changes on Energy Consumption Simon I. Hill, Frédéric Desobry and Yu-Foong Chong May DST Daylight Saving Time EIA Energy Information Administration GDP Gross Domestic Product GMT

  6. 15 Acoustic Daylight Imaging in the Michael J. Buckingham

    E-Print Network [OSTI]

    Buckingham, Michael

    15 Acoustic Daylight Imaging in the Ocean Michael J. Buckingham Scripps Institution of Oceanography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418 15.4 Acoustic daylight images . . . . . . . . . . . . . . . . . . . . . . . . 420 15.5 Concluding. Sensors and Imaging ISBN 0­12­379771­3/$30.00 #12;416 15 Acoustic Daylight Imaging in the Ocean Acoustic

  7. Loss of Daylight Vision in Retinal Degeneration: Are

    E-Print Network [OSTI]

    Tabin, Cliff

    Loss of Daylight Vision in Retinal Degeneration: Are Oxidative Stress and Metabolic Dysregulation, particularly in cones, the type of photoreceptors that mediate daylight and color vision. The evidence, providing our daylight vision, and have many of the same features and vulnerabilities as rod photoreceptors

  8. The Impact on Energy Consumption of Daylight Saving Clock Changes

    E-Print Network [OSTI]

    Hill, Simon I.

    The Impact on Energy Consumption of Daylight Saving Clock Changes S. I. Hilla, , F. Desobrya , E. W demonstrating po- tential energy savings which could be obtained were Great Britain to maintain Daylight Savings result from an extension of Daylight Saving Time (DST) over the months currently on Greenwich Mean Time

  9. Complex Networked Control Systems

    E-Print Network [OSTI]

    buildings, modern control systems are increasingly incorporating communication networks in feedback loops [5Complex Networked Control Systems W e live and operate in a networked world. We drive to work on the performance of feedback control systems [5], [6]. Signifi- cant attention is focused on devising local

  10. COMPUTATIONAL SIMULATIONS FOR PREDICTING VERTICAL DAYLIGHT LEVELS IN ATRIUM BUILDINGS

    E-Print Network [OSTI]

    Jiangtao Du; Steve Sharples

    This paper investigates the impact of well geometry and surface reflectance on vertical daylight levels in atria with square forms under a CIE standard overcast sky. By reviewing some previous investigations and comparing with scale model measurements the vertical daylight factor calculated using Radiance are validated. More simulated vertical daylight factors for a very wide range of atrium geometries and reflectances are given. From the results the attenuation and distribution of the vertical daylight levels on the wall of a square atrium with different reflectances are displayed. Also, the comparisons between simulations and two analytical theories have been performed. Finally some conclusions for supporting daylight design in atria are presented.

  11. Acceleration of the matrix multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware of personal computer

    SciTech Connect (OSTI)

    University of Miami; Zuo, Wangda; McNeil, Andrew; Wetter, Michael; Lee, Eleanor S.

    2013-04-30T23:59:59.000Z

    Building designers are increasingly relying on complex fenestration systems to reduce energy consumed for lighting and HVAC in low energy buildings. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex fenestration systems. Depending on the configurations, the simulation can take hours or even days using a personal computer. This paper describes how to accelerate the matrix multiplication portion of a Radiance three-phase daylight simulation by conducting parallel computing on heterogeneous hardware of a personal computer. The algorithm was optimized and the computational part was implemented in parallel using OpenCL. The speed of new approach was evaluated using various daylighting simulation cases on a multicore central processing unit and a graphics processing unit. Based on the measurements and analysis of the time usage for the Radiance daylighting simulation, further speedups can be achieved by using fast I/O devices and storing the data in a binary format.

  12. Does Daylight Savings Time Affect Traffic Accidents?

    E-Print Network [OSTI]

    Deen, Sophia 1988-

    2012-04-20T23:59:59.000Z

    This paper studies the effect of changes in accident pattern due to Daylight Savings Time (DST). The extension of the DST in 2007 provides a natural experiment to determine whether the number of traffic accidents is affected by shifts in hours...

  13. PDX diagnostic control system

    SciTech Connect (OSTI)

    Mika, R.

    1981-01-01T23:59:59.000Z

    This paper describes a computer-base diagnostic control system operating on the PDX Tokamak. The prime function of the system is to control mechanical positioning devices associated with various diagnostics including Thomson Scattering, X-Ray Pulse Height Analyzer, Rotating Scanning Monochromator, Fast Ion Detection Experiment, Bolometers and Plasma Limiters. The diagnostic control system consists of a PDP-11/34 computer, a CAMAC system partitioned between the PDX control room and the PDX machine area, and special electronic control modules developed at PPL. The special modules include a digital closed loop motor controller and user interface control panel for control and status display. A standard control panel was developed for interfacing each system user with the PDP-11/34 computer, through specially developed CAMAC modules.

  14. Invited paper for the 2001 IESNA National Conference Daylighting, Dimming, and the Electricity Crisis in California

    E-Print Network [OSTI]

    building peak electric loads. During times of energy shortage, there is a greatly increased need to reduce the operating costs of buildings. The paper presents a typical commercial building electric demand profile during summer, and shows how daylighting-linked lighting controls and load shedding techniques can reduce

  15. CONTROL STRUCTURE DESIGN IN PROCESS CONTROL SYSTEMS

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    CONTROL STRUCTURE DESIGN IN PROCESS CONTROL SYSTEMS Karl Henrik Johansson Department of EECS of Automatic Control Lund University, Sweden tore@control.lth.se Abstract: The control configuration problem industrial control problems. Copyright c 2000 IFAC 1. INTRODUCTION Autonomy in process control systems

  16. ALFA Detector Control System

    E-Print Network [OSTI]

    Oleiro Seabra, Luis Filipe; The ATLAS collaboration

    2015-01-01T23:59:59.000Z

    ALFA (Absolute Luminosity For ATLAS) is one of the sub-detectors of ATLAS/LHC. The ALFA system is composed by two stations installed in the LHC tunnel 240 m away from each side of the ATLAS interaction point. Each station has a vacuum and ventilation system, movement control and all the required electronic for signal processing. The Detector Control System (DCS) provides control and monitoring of several components and ensures the safe operation of the detector contributing to good Data Quality. This paper describes the ALFA DCS system including a detector overview, operation aspects and hardware control through a SCADA system, WinCC OA.

  17. ALFA Detector Control System

    E-Print Network [OSTI]

    Oleiro Seabra, Luis Filipe; The ATLAS collaboration

    2015-01-01T23:59:59.000Z

    ALFA (Absolute Luminosity For ATLAS) is one of the sub-detectors of ATLAS (A Toroidal LHC Apparatus). The ALFA system is composed by four stations installed in the LHC tunnel 240 m away from the ATLAS interaction point. Each station has a vacuum and ventilation system, movement control and all the required electronics for signal processing. The Detector Control System (DCS) provides control and monitoring of several components and ensures the safe operation of the detector contributing to good Data Quality. This paper describes the ALFA DCS system including a detector overview, operation aspects and hardware control through a SCADA system, WinCC OA.

  18. Assessing the Feasibility of Creek Daylighting in San Francisco, Part II: A Preliminary Analysis of Yosemite Creek

    E-Print Network [OSTI]

    Smith, Brooke Ray

    2007-01-01T23:59:59.000Z

    or purchased properties) to daylight the stream? Or is itrestoration (Smith 2007). Why Daylight in San Francisco? Inof San Francisco to daylight Yosemite Creek, how and where

  19. Correlation time of ocean ambient noise intensity in San Diego Bay and target recognition in acoustic daylight images

    E-Print Network [OSTI]

    Wadsworth, Adam J.

    2010-01-01T23:59:59.000Z

    Intensity Data Chapter 3 Acoustic Daylight Image TargetC. L. Epifanio. Acoustic Daylight: Passive Acoustic ImagingRecognition in Acoustic Daylight Images A Thesis submitted

  20. Control and optimization system

    DOE Patents [OSTI]

    Xinsheng, Lou

    2013-02-12T23:59:59.000Z

    A system for optimizing a power plant includes a chemical loop having an input for receiving an input parameter (270) and an output for outputting an output parameter (280), a control system operably connected to the chemical loop and having a multiple controller part (230) comprising a model-free controller. The control system receives the output parameter (280), optimizes the input parameter (270) based on the received output parameter (280), and outputs an optimized input parameter (270) to the input of the chemical loop to control a process of the chemical loop in an optimized manner.

  1. Control Systems & LEED

    SciTech Connect (OSTI)

    Cooperman, Alissa; Dieckmann, John; Brodrick, James

    2012-06-01T23:59:59.000Z

    This article discusses the LEED guidelines (2009 v3), and corresponding points, that can only be attained using control systems for lighting, HVAC, and/or the entire building. Integrating and centralizing control systems allows for better building management, energy savings and can potentially award 29 points towards certification across the following categories: Sustainable Sites, Energy & Atmosphere, and Indoor Air Quality. In closing, potential energy savings are highlighted and the overall market potential for control systems are summarized.

  2. System Protection Control Craftman

    Broader source: Energy.gov [DOE]

    A successful candidate will perform preventative and corrective maintenance on protective relays, revenue meters, telemetering schemes, substation control systems and various kinds of substation...

  3. Stepping Motor Control System

    E-Print Network [OSTI]

    Larson, Noble G.

    This paper describes a hardware system designed to facilitate position and velocity control of a group of eight stepping motors using a PDP-11. The system includes motor driver cards and other interface cards in addition ...

  4. Impact of Fixed Exterior Shading on Daylighting: A Case Study of the David Brower Center

    E-Print Network [OSTI]

    Zelenay, Krystyna

    2011-01-01T23:59:59.000Z

    blind systems were always lowered and seasonally adjusted (continued on next page) MS Thesis,Thesis, Dept. of Architecture, UC Berkeley 2011 http://escholarship.org/uc/item/1mq5k9mw blinds,blinds frequently enough to take advantage of daylighting. 14 While MS Thesis,

  5. Control system design guide

    SciTech Connect (OSTI)

    Sellers, David; Friedman, Hannah; Haasl, Tudi; Bourassa, Norman; Piette, Mary Ann

    2003-05-01T23:59:59.000Z

    The ''Control System Design Guide'' (Design Guide) provides methods and recommendations for the control system design process and control point selection and installation. Control systems are often the most problematic system in a building. A good design process that takes into account maintenance, operation, and commissioning can lead to a smoothly operating and efficient building. To this end, the Design Guide provides a toolbox of templates for improving control system design and specification. HVAC designers are the primary audience for the Design Guide. The control design process it presents will help produce well-designed control systems that achieve efficient and robust operation. The spreadsheet examples for control valve schedules, damper schedules, and points lists can streamline the use of the control system design concepts set forth in the Design Guide by providing convenient starting points from which designers can build. Although each reader brings their own unique questions to the text, the Design Guide contains information that designers, commissioning providers, operators, and owners will find useful.

  6. Weighted control systems

    E-Print Network [OSTI]

    Al-Radhi, Adhi Omar

    1974-01-01T23:59:59.000Z

    ) 50 3-10 Defects per Unit Control Charts (Sudden Increase in Number of Defects) 51 3-11 Defects per Unit Control Charts (Slow Increase in Number of Defects) 52 3-12 O. C. Curves of Fraction Defectives Control Charts. 54 3-13 O. C. Curves.... The exponential smoothing principle was introduced to quality control field in 1959. It was first adapted in the mean control chart [25]. Through this control system, the most recent information is weighted and combined with the weighted past observations. 10...

  7. Common Control System Vulnerability

    SciTech Connect (OSTI)

    Trent Nelson

    2005-12-01T23:59:59.000Z

    The Control Systems Security Program and other programs within the Idaho National Laboratory have discovered a vulnerability common to control systems in all sectors that allows an attacker to penetrate most control systems, spoof the operator, and gain full control of targeted system elements. This vulnerability has been identified on several systems that have been evaluated at INL, and in each case a 100% success rate of completing the attack paths that lead to full system compromise was observed. Since these systems are employed in multiple critical infrastructure sectors, this vulnerability is deemed common to control systems in all sectors. Modern control systems architectures can be considered analogous to today's information networks, and as such are usually approached by attackers using a common attack methodology to penetrate deeper and deeper into the network. This approach often is composed of several phases, including gaining access to the control network, reconnaissance, profiling of vulnerabilities, launching attacks, escalating privilege, maintaining access, and obscuring or removing information that indicates that an intruder was on the system. With irrefutable proof that an external attack can lead to a compromise of a computing resource on the organization's business local area network (LAN), access to the control network is usually considered the first phase in the attack plan. Once the attacker gains access to the control network through direct connections and/or the business LAN, the second phase of reconnaissance begins with traffic analysis within the control domain. Thus, the communications between the workstations and the field device controllers can be monitored and evaluated, allowing an attacker to capture, analyze, and evaluate the commands sent among the control equipment. Through manipulation of the communication protocols of control systems (a process generally referred to as ''reverse engineering''), an attacker can then map out the control system processes and functions. With the detailed knowledge of how the control data functions, as well as what computers and devices communicate using this data, the attacker can use a well known Man-in-the-Middle attack to perform malicious operations virtually undetected. The control systems assessment teams have used this method to gather enough information about the system to craft an attack that intercepts and changes the information flow between the end devices (controllers) and the human machine interface (HMI and/or workstation). Using this attack, the cyber assessment team has been able to demonstrate complete manipulation of devices in control systems while simultaneously modifying the data flowing back to the operator's console to give false information of the state of the system (known as ''spoofing''). This is a very effective technique for a control system attack because it allows the attacker to manipulate the system and the operator's situational awareness of the perceived system status. The three main elements of this attack technique are: (1) network reconnaissance and data gathering, (2) reverse engineering, and (3) the Man-in-the-Middle attack. The details of this attack technique and the mitigation techniques are discussed.

  8. OpenStudio Enhancements for Whole-Building Daylighting, Airflow...

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

    aims to boost retrofit projects and enable project teams to easily integrate energy, daylight, and airflow modeling into their design workflows. View the Presentation OpenStudio...

  9. Acceleration of the matrix multiplication of Radiance three phase daylighting simulations

    E-Print Network [OSTI]

    LBNL-6461E Acceleration of the matrix multiplication of Radiance three phase daylighting multiplication of Radiance three phase daylighting simulations with parallel computing on heterogeneous hardware. Radiance, a lighting simulation program, has been used to conduct daylighting simulations for complex

  10. Does Daylight Saving Time Save Energy? Evidence from a Natural Experiment in Indiana

    E-Print Network [OSTI]

    Kotchen, Matthew J; Grant, Laura E.

    2008-01-01T23:59:59.000Z

    Does Extending Daylight Saving Time Save Energy? Evi- denceWP 179 Does Daylight Saving Time Save Energy? Evidence fromwww.ucei.org Does Daylight Saving Time Save Energy? Evidence

  11. Power Systems Control Architecture

    SciTech Connect (OSTI)

    James Davidson

    2005-01-01T23:59:59.000Z

    A diagram provided in the report depicts the complexity of the power systems control architecture used by the national power structure. It shows the structural hierarchy and the relationship of the each system to those other systems interconnected to it. Each of these levels provides a different focus for vulnerability testing and has its own weaknesses. In evaluating each level, of prime concern is what vulnerabilities exist that provide a path into the system, either to cause the system to malfunction or to take control of a field device. An additional vulnerability to consider is can the system be compromised in such a manner that the attacker can obtain critical information about the system and the portion of the national power structure that it controls.

  12. THE AVERAGED CONTROL SYSTEM OF FAST OSCILLATING CONTROL SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    , control systems, small control, optimal control, Finsler geometry. AMS subject classifications. 34C29, 34H used for design. The use of averaging in optimal control of oscillating systems [10, 13, 14, 7THE AVERAGED CONTROL SYSTEM OF FAST OSCILLATING CONTROL SYSTEMS ALEX BOMBRUN AND JEAN

  13. Information in coordinated system control

    E-Print Network [OSTI]

    Kang, Keunmo

    2008-01-01T23:59:59.000Z

    nonlinear systems’, IEEE Transaction of Automatic Controllinear systems’, IEEE Transactions on Automatic Control 23,nonlinear systems’, IEEE Transactions on Automatic Control

  14. Natural Daylighting - An Energy Analysis

    E-Print Network [OSTI]

    Jarrell, R. P.

    1987-01-01T23:59:59.000Z

    tiers of elevators, which afforded met by the codes in both economic and energy savings. Because at the time of the design and con- Of the basic premise of the planning con- ~truction. The following table gives data cept, the two-tower scheme... temperature and ventilation control is provided by induction boxes. These boxes reclaim up to 50 percent of the heat from the lights by inducing warm air from the ceiling plenum to the exterior areas where heat is needed in winter. In the summer...

  15. The Epicure Control System

    SciTech Connect (OSTI)

    Dambik, E.; Kline, D.; West, R.

    1993-09-01T23:59:59.000Z

    The Epicure Control System supports the Fermilab fixed target physics program. The system is distributed across a network of many different types of components. The use of multiple layers on interfaces for communication between logical tasks fits the client-server model. Physical devices are read and controlled using symbolic references entered into a database with an editor utility. The database system consists of a central portion containing all device information and optimized portions distributed among many nodes. Updates to the database are available throughout the system within minutes after being requested.

  16. Tips for Daylighting with Windows

    SciTech Connect (OSTI)

    Robinson, Alastair; Selkowitz, Stephen

    2013-10-01T23:59:59.000Z

    These guidelines provide an integrated approach to the cost-effective design of perimeter zones in new commercial buildings and existing building retrofits. They function as a quick reference for building designers, through a set of easy steps and rules-of-thumb, emphasizing “how-to” practical details. References are given to more detailed sources of information, should the reader wish to go further. The design method used in this document emphasizes that building decisions should be made within the context of the whole building as a single functioning system rather than as an assembly of distinct parts. This integrated design approach looks at the ramifications of each individual system decision on the whole building. For example, the decision on glazing selection will have an effect on lighting, mechanical systems, and interior design. Therefore, the entire design team should participate and influence this glazing decision—which typically rests with the architect alone. The benefit of an integrated design approach is a greater chance of success towards long-term comfort and sustained energy savings in the building.

  17. Green Classroom: Daylighting-conscious Design for Kuwait Autism Center

    E-Print Network [OSTI]

    Abdullah Al-mohaisen; Omar Khattab

    Consideration to the natural elements, such as daylighting, at the earliest in the architectural design process is suggested by many as necessary for sustainable buildings. The implementation of a successful daylighting strategy in the design of buildings improves spatial quality and saves energy required, otherwise, for artificial lighting. Daylighting becomes a design mandate in the case of certain spaces; e.g. classrooms in educational buildings. Many researchers have indicated a correlation between the way classrooms are designed and students ' performance. This paper discusses a case study of the environmental design of Kuwait Autism Centre that adopted the provision of adequate daylighting in educational spaces as a major design focus. An extensive daylighting evaluation was conducted on all educational facilities of the proposed conceptual design of the centre. The recommendations from the evaluation were implemented in the design development stages. Earlier conceptual design drawings as well as the final designs are described. The paper summarises the daylighting design recommendations and explains the daylighting simulation process and analysis for decision making in design. Additionally it shows the annual energy savings as a result of the daylighting-conscious design of the classrooms.

  18. Color and spectral analysis of daylight in southern Europe

    E-Print Network [OSTI]

    Javier Hernández-andrés; Javier Romero; Juan L. Nieves; Raymond L. Lee

    2001-01-01T23:59:59.000Z

    We have analyzed the colorimetric and spectral characteristics of 2600 daylight spectra (global spectral irradiances on a horizontal surface) measured for all sky states during a 2-year period at Granada, Spain. We describe in detail the chromaticity coordinates, correlated color temperatures (CCT), luminous efficacies, and relative UV and IR contents of Granada daylight. The chromaticity coordinates of Granada daylight lie far above the CIE locus at high CCTs (?9000 K), and a CCT of 5700 K best typifies this daylight. Our principalcomponents analysis shows that Granada daylight spectra can be adequately represented by using sixdimensional linear models in the visible, whereas seven-dimensional models are required if we include the UV or near-IR. Yet on average only three-dimensional models are needed to reconstruct spectra that are colorimetrically indistinguishable from the original spectra. © 2001 Optical Society of America OCIS codes: 010.1290, 330.1710, 330.1730. 1.

  19. FMIT facility control system

    SciTech Connect (OSTI)

    Suyama, R.M.; Machen, D.R.; Johnson, J.A.

    1981-01-01T23:59:59.000Z

    The control system for the Fusion Materials Irradiation Test (FMIT) Facility, under construction at Richland, Washington, uses current techniques in distributed processing to achieve responsiveness, maintainability and reliability. Developmental experience with the system on the FMIT Prototype Accelerator (FPA) being designed at the Los Alamos National Laboratory is described as a function of the system's design goals and details. The functional requirements of the FMIT control system dictated the use of a highly operator-responsive, display-oriented structure, using state-of-the-art console devices for man-machine communications. Further, current technology has allowed the movement of device-dependent tasks into the area traditionally occupied by remote input-output equipment; the system's dual central process computers communicate with remote communications nodes containing microcomputers that are architecturally similar to the top-level machines. The system has been designed to take advantage of commercially available hardware and software.

  20. Burner control system

    SciTech Connect (OSTI)

    Cade, P.J.

    1981-01-06T23:59:59.000Z

    A burner control apparatus for use with a furnace installation that has an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in the monitored combustion chamber, and one or more devices for control of ignition and/or fuel flow. The burner control apparatus comprises lockout apparatus for de-energizing the control apparatus, a control device for actuating the ignition and/or fuel control devices, and a timing circuit that provides four successive and partially overlapping timing intervals of precise relation, including a purge timing interval, a pilot ignition interval, and a main fuel ignition interval. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace including particularly the air flow sensor. Additionally, the present system also prevents an attempt to ignite a burner if a condition is detected which indicates that the air flow sensor has been bypassed or wedged in the actuated position.

  1. Well valve control system

    SciTech Connect (OSTI)

    Schwendemann, K.L.; McCracken, O.W.; Mondon, C.G.; Wortham, L.C.

    1987-01-13T23:59:59.000Z

    A system is described for controlling well testing through an upper and lower test string with a subsea test tree connected therebetween and latch means to release the upper test string from the subsea test tree comprising: a. first and second selectively programmable microprocessor means; b. means for storing system operating limits in each microprocessor means; c. means for changing the operating limits in response to changes in well conditions; d. means for communicating operating fluid pressure to the subsurface test tree and the latch means; e. solenoid pilot valves controlling the flow of the operating fluid pressure to the subsea test tree and the latch means; f. the first microprocessor means located at a central control console; g. the second microprocessor means located near the solenoid valves; h. means for transmitting signals between the first and second microprocessor means and validating the accuracy of the signals; and i. electronic circuits to control operation of the solenoid valves in response to validated signals.

  2. Gas Slow Control System Specifications

    E-Print Network [OSTI]

    Roma "La Sapienza", Università di

    AMS-02 TRD Gas Slow Control System Specifications v 4.2 26-06-2006 A. Bartoloni, B. Borgia, F. Bucci, F. R. Spada INFN Sezione di Roma 1- Roma, Italy #12;2/45 #12;3/45 1. ABSTRACT 5 2. GAS SYSTEM FUNCTIONAL DESCRIPTION 5 3. GAS CONTROL SYSTEM 8 4. CONTROL SYSTEM COMPONENTS 12 a. Universal Control System

  3. (Daylight saving time (DST), implemented as an energy saving policy, impacts many other aspects of

    E-Print Network [OSTI]

    Levinson, David M.

    Abstract( (Daylight saving time (DST), implemented as an energy saving policy, impacts many other(of(DST( The idea of daylight saving time is to transfer an hour of morning daylight to the evening. It is achieved (3am-9am, 9am-3pm, 3pm-9pm, 9pm-12am). The(effects(of(daylight

  4. Anomalous trichromats' judgments of surface color in natural scenes under different daylights

    E-Print Network [OSTI]

    Foster, David H.

    Anomalous trichromats' judgments of surface color in natural scenes under different daylights daylight illuminants were presented on a high-resolution color monitor to 7 deuteranomalous, 7 to the daylight locus rather than along the daylight locus ~Foster & Linnell, 1995; Amano et al., 2003

  5. The effects of daylight saving time on vehicle crashes in Minnesota Arthur Huang a,

    E-Print Network [OSTI]

    Levinson, David M.

    The effects of daylight saving time on vehicle crashes in Minnesota Arthur Huang a, , David: Daylight saving time Vehicle crashes Exposure Traffic volume Introduction: Daylight saving time (DST analysis shows that overall DST reduces crashes. Impact on industry: Daylight saving time can lead to fewer

  6. Advanced fenestration systems for improved daylight performance

    E-Print Network [OSTI]

    Selkowitz, S.; Lee, E.S.

    1998-01-01T23:59:59.000Z

    technology for dynamic, smart glazings has the potential toSwitchable Glazing: Towards the Development of the Smart

  7. Advanced fenestration systems for improved daylight performance

    E-Print Network [OSTI]

    Selkowitz, S.; Lee, E.S.

    1998-01-01T23:59:59.000Z

    SPIE Optical Materials Technology for Energy Efficiency andon Optical Materials Technology for Energy Efficiency andon Optical Materials Technology for Energy Efficiency and

  8. Experimental Evaluation of Innovative Wall Daylighting Systems

    E-Print Network [OSTI]

    Place, J. W.; Howard, T. C.; Paulos, S.; Chung, K.

    1988-01-01T23:59:59.000Z

    to deliver most of the light from the projecting mirror to the two inner spaces. One way of doing this without causing glare to the occupants is to project the light on the area of ceiling over the two spaces and allow the ceiling to serve aa a secondary.... Providing illumination in buildings using sunlight as a substitute for electric light is attractive for several reasons: 1. The solar illumination resource is substantial; during most working hours, the solar illumination on a building is several times...

  9. Daylighting systems for the Kuwait National Museum

    E-Print Network [OSTI]

    Ahn, Byoungsoo

    2005-08-29T23:59:59.000Z

    sky condition (Southeast gallery, 12:00 PM, Jun 21) .......................................................... 54 50 Iso-contour image under the clear sky and overcast sky condition (Southeast gallery, 12:00 PM, Jun 21...) .......................................................... 55 51 False color image under the clear sky and overcast sky condition (Southeast gallery, 12:00 PM, Dec 21).......................................................... 56 52 Iso-contour image under the clear sky and overcast sky...

  10. Advanced Facades, Daylighting, and Complex Fenestration Systems |

    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 onYouTube YouTube Note: Since the YouTube platform is alwaysISO 50001Energy Efficiency GrantsElectrocatalysts

  11. Advanced Facades, Daylighting, and Complex Fenestration Systems

    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 DataDepartment of Energy Your Density Isn't Your Destiny: The Future of1 AAccelerated agingDepartmentDevelopment and

  12. Electric turbocompound control system

    DOE Patents [OSTI]

    Algrain, Marcelo C. (Dunlap, IL)

    2007-02-13T23:59:59.000Z

    Turbocompound systems can be used to affect engine operation using the energy in exhaust gas that is driving the available turbocharger. A first electrical device acts as a generator in response to turbocharger rotation. A second electrical device acts as a motor to put mechanical power into the engine, typically at the crankshaft. Apparatus, systems, steps, and methods are described to control the generator and motor operations to control the amount of power being recovered. This can control engine operation closer to desirable parameters for given engine-related operating conditions compared to actual. The electrical devices can also operate in "reverse," going between motor and generator functions. This permits the electrical device associated with the crankshaft to drive the electrical device associated with the turbocharger as a motor, overcoming deficient engine operating conditions such as associated with turbocharger lag.

  13. Incoherent Control of Locally Controllable Quantum Systems

    E-Print Network [OSTI]

    Daoyi Dong; Chenbin Zhang; Herschel Rabitz; Alexander Pechen; Tzyh-Jong Tarn

    2008-10-21T23:59:59.000Z

    An incoherent control scheme for state control of locally controllable quantum systems is proposed. This scheme includes three steps: (1) amplitude amplification of the initial state by a suitable unitary transformation, (2) projective measurement on the amplified state, and (3) final optimization by a unitary controlled transformation. The first step increases the amplitudes of some desired eigenstates and the corresponding probability of observing these eigenstates, the second step projects, with high probability, the amplified state into a desired eigenstate, and the last step steers this eigenstate into the target state. Within this scheme, two control algorithms are presented for two classes of quantum systems. As an example, the incoherent control scheme is applied to the control of a hydrogen atom by an external field. The results support the suggestion that projective measurements can serve as an effective control and local controllability information can be used to design control laws for quantum systems. Thus, this scheme establishes a subtle connection between control design and controllability analysis of quantum systems and provides an effective engineering approach for controlling quantum systems with partial controllability information.

  14. Gaseous reactor control system

    SciTech Connect (OSTI)

    Abdel-Khalik, S.

    1991-09-03T23:59:59.000Z

    This paper describes a nuclear reactor control system for controlling the reactivity of the core of a nuclear reactor. It includes a control gas having a high neutron cross-section; a first tank containing a first supply of the control gas; a first conduit providing a first fluid passage extending into the core, the first conduit being operatively connected to communicate with the first tank; a first valve operatively connected to regulate the flow of the control gas between the first tank and the first conduit; a second conduit concentrically disposed around the first conduit such that a second fluid passage is defined between the outer surface of the first conduit and the inner surface of the second conduit; a second tank containing a second supply of the control gas, the second tank being operatively connected to communicate with the second fluid passage; a second supply valve operatively connected to regulate the flow of the control gas between the second tank and the second fluid passage.

  15. Optimal control of controllable switched systems

    E-Print Network [OSTI]

    Rinehart, Michael David

    2005-01-01T23:59:59.000Z

    Many of the existing techniques for controlling switched systems either require the solution to a complex optimization problem or significant sacrifices to either stability or performance to offer practical controllers. ...

  16. Photovoltaic system controller

    SciTech Connect (OSTI)

    Gerken, K.F.; Sullivan, R.A.

    1989-12-19T23:59:59.000Z

    This patent describes a photovoltaic system controller for utilization with a photovoltaic power system including at least a photovoltaic array, a system battery adapted to be charged by the array and a load adapted to be powered by the battery. The controller comprising a microprocessor having an erasable programmable memory. The microprocessor having means to receive input data from the array, the battery and the load. The microprocessor having means to evaluate the input data in relation to at least one predetermined setpoint, the microprocessor in response to the evaluation being adapted to disconnect the battery from the array or to disconnect the load from the battery. The setpoint being adapted to be adjusted to a second setpoint by adjustment means, and the erasable programmable memory being adapted to be changed whereby the evaluation performed by the microprocessor is also changed.

  17. Daylighting design analysis. Project status report No. 2, 1 March-31 December 1980. [For pre-engineered metal buildings

    SciTech Connect (OSTI)

    Hallagan, W.B.; Lindsey, L.L.; Snyder, M.K.

    1980-01-01T23:59:59.000Z

    Detailed scale model studies regarding daylighting aspects of the passive/hybrid solar test building located at Butler Research Center in Grandview, MO are discussed. The product development program is aimed at providing passive/hybrid system building alternatives for commercial, industrial, and community purchasers of Butler's Landmark pre-engineered metal buildings. Occasioned by recognition, early in the project, that daylighting could strongly influence annual energy consumption in buildings of the targetted use types, scale models of several alternative design configurations, including that of the test building in Grandview, were built and tested. The major design alternatives, test results, and conclusions to date are described.

  18. PEP instrumentation and control system

    SciTech Connect (OSTI)

    Melen, R.

    1980-06-01T23:59:59.000Z

    This paper describes the operating characteristics of the primary components that form the PEP Instrumentation and Control System. Descriptions are provided for the computer control system, beam monitors, and other support systems.

  19. Practical free-space quantum key distribution over 10 km in daylight and at night

    E-Print Network [OSTI]

    Richard J. Hughes; Jane E. Nordholt; Derek Derkacs; Charles G. Peterson

    2002-06-14T23:59:59.000Z

    We have demonstrated quantum key distribution (QKD) over a 10-km, 1-airmass atmospheric range during daylight and at night. Secret random bit sequences of the quality required for the cryptographic keys used to initialize secure communications devices were transferred at practical rates with realistic security. By identifying the physical parameters that determine the system's secrecy efficiency, we infer that free-space QKD will be practical over much longer ranges under these and other atmospheric and instrumental conditions.

  20. Daylight variability and contrast-driven architectural effect

    E-Print Network [OSTI]

    Rockcastle, Siobhan Francois

    2011-01-01T23:59:59.000Z

    Natural light is a dynamic and ephemeral tool for expressing the quality of architectural space. As a compliment to more traditional avenues of daylighting research that assess performance in terms of quantitative illuminance ...

  1. An intuitive daylighting performance analysis and optimization approach

    E-Print Network [OSTI]

    Andersen, Marilyne

    The effective integration of daylighting considerations into the design process requires many issues to be considered simultaneously, such as daily and seasonal variations, illumination, and thermal comfort. To address the ...

  2. Automated support for experimental approaches in daylighting performances assessment

    E-Print Network [OSTI]

    Ljubicic, Dean M

    2006-01-01T23:59:59.000Z

    The study of daylight and solar reflection has been a topic of increasing interest over the past two decades. A novel mechanical support has been constructed to help better understand this topic that consists of a five ...

  3. DAYLIGHTING IN CAMBRIDGE LIBRARIES: SHIFTING FOCUS OVER TIME

    E-Print Network [OSTI]

    Ayona Datta

    This paper aims to explore the various transformations of Cambridge libraries over the ages focusing mainly on the changing role of daylighting in library design. The libraries have been categorised chronologically into four different groups: Medieval libraries, libraries between 16 th cent and Reformation, libraries between Reformation and 19 th cent and modern libraries. The study shows that with the shift from the rules of classicism in medieval libraries to individual styles in modern libraries, the architect has opened up enormous possibilities for design innovations in daylighting. Unlike other environmental services the elements of daylighting are undoubtedly the most visual and expressive. The particular challenge of modern library design is to manipulate natural light for reading and book storage while avoiding reflections on the VDU. It is still a field not fully explored and it remains to be seen how daylighting design can successfully meet all the needs of a modern library. 1.

  4. Interfacing BIM with Building Thermal and Daylighting Modeling

    E-Print Network [OSTI]

    Yan, Wei; Clayton, Mark; Haberl, Jeff; WoonSeong, Jeong; Bun Kim, Jong; Sandeep, Kota; Bermudez, Jose; Dixit, Manish

    INTERFACING BIM WITH BUILDING THERMAL AND DAYLIGHTING MODELING Wei Yan, Mark Clayton, Jeff Haberl, WoonSeong Jeong, Jong Bum Kim, Sandeep Kota, Jose Luis Bermudez Alcocer, and Manish Dixit Texas A&M University, College Station, USA... the BIM authoring tools’ Application Programming Interface (API) to translate BIM into Object-Oriented Physical Models (in Modelica) for building thermal simulation, and input files of ray-tracing software (Radiance) for daylighting simulation. Based...

  5. Effective Daylighting: Evaluating Daylighting Performance in the San Francisco Federal Building from the Perspective of Building Occupants

    E-Print Network [OSTI]

    Konis, Kyle Stas

    2012-01-01T23:59:59.000Z

    Annex 29, Daylight in Buildings. October, 1997. Atif. M.R.case studies. Energy and Buildings 35 441-461. Attmann,George. 2010. Sustainable Buildings in Practice: What the

  6. Retrofit Diesel Emissions Control System Providing 50% NOxControl...

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

    Diesel Emissions Control System Providing 50% NOxControl Retrofit Diesel Emissions Control System Providing 50% NOxControl 2005 Diesel Engine Emissions Reduction (DEER) Conference...

  7. On Cyber Security for Networked Control Systems

    E-Print Network [OSTI]

    Amin, Saurabh

    2011-01-01T23:59:59.000Z

    optimal control and stabilization for linear systems with bounded controloptimal switching control for abstract linear systems onoptimal control for discrete-time, linear dynamical systems in which control

  8. An experimental setup to evaluate the daylighting performance of an advanced optical light pipe for deep-plan office buildings

    E-Print Network [OSTI]

    Martins Mogo de Nadal, Betina Gisela

    2005-11-01T23:59:59.000Z

    This research focuses on an advanced optical light pipe daylighting system as a means to deliver natural light at the back of deep-plan office buildings (15ft to 30ft), using optimized geometry and high reflective materials. The light pipe...

  9. Empirical assessment of a prismatic daylight-redirecting window film in a full-scale office testbed

    SciTech Connect (OSTI)

    Thanachareonkit, Anothai; Lee, Eleanor S.; McNeil, Andrew

    2013-08-31T23:59:59.000Z

    Daylight redirecting systems with vertical windows have the potential to offset lighting energy use in deep perimeter zones. Microstructured prismatic window films can be manufactured using low-cost, roll-to-roll fabrication methods and adhered to the inside surface of existing windows as a retrofit measure or installed as a replacement insulating glass unit in the clerestory portion of the window wall. A clear film patterned with linear, 50-250 micrometer high, four-sided asymmetrical prisms was fabricated and installed in the south-facing, clerestory low-e, clear glazed windows of a full-scale testbed facility. Views through the film were distorted. The film was evaluated in a sunny climate over a two-year period to gauge daylighting and visual comfort performance. The daylighting aperture was small (window-towall ratio of 0.18) and the lower windows were blocked off to isolate the evaluation to the window film. Workplane illuminance measurements were made in the 4.6 m (15 ft) deep room furnished as a private office. Analysis of discomfort glare was conducted using high dynamic range imaging coupled with the evalglare software tool, which computes the daylight glare probability and other metrics used to evaluate visual discomfort. The window film was found to result in perceptible levels of discomfort glare on clear sunny days from the most conservative view point in the rear of the room looking toward the window. Daylight illuminance levels at the rear of the room were significantly increased above the reference window condition, which was defined as the same glazed clerestory window but with an interior Venetian blind (slat angle set to the cut-off angle), for the equinox to winter solstice period on clear sunny days. For partly cloudy and overcast sky conditions, daylight levels were improved slightly. To reduce glare, the daylighting film was coupled with a diffusing film in an insulating glazing unit. The diffusing film retained the directionality of the redirected light spreading it within a small range of outgoing angles. This solution was found to reduce glare to imperceptible levels while retaining for the most part the illuminance levels achieved solely by the daylighting film.

  10. Division 1137 property control system

    SciTech Connect (OSTI)

    Pastor, D.J.

    1982-01-01T23:59:59.000Z

    An automated data processing property control system was developed by Mobile and Remote Range Division 1137. This report describes the operation of the system and examines ways of using it in operational planning and control.

  11. Generic device controller for accelerator control systems

    SciTech Connect (OSTI)

    Mariotti, R.; Buxton, W.; Frankel, R.; Hoff, L.

    1987-01-01T23:59:59.000Z

    A new distributed intelligence control system has become operational at the AGS for transport, injection, and acceleration of heavy ions. A brief description of the functionality of the physical devices making up the system is given. An attempt has been made to integrate the devices for accelerator specific interfacing into a standard microprocessor system, namely, the Universal Device Controller (UDC). The main goals for such a generic device controller are to provide: local computing power; flexibility to configure; and real time event handling. The UDC assemblies and software are described. (LEW)

  12. Empirical assessment of a prismatic daylight-redirecting window film in a full-scale office testbed

    E-Print Network [OSTI]

    Thanachareonkit, Anothai

    2014-01-01T23:59:59.000Z

    Jonsson JC. 2013. Daylight performance of a microstructuredH. Device for guiding daylight, US Patent 4,654,243 (JL, Selkowitz S. 2000. Daylight in buildings: A source book

  13. SRS control system upgrade requirements

    SciTech Connect (OSTI)

    Hill, L.F.

    1998-08-04T23:59:59.000Z

    This document defines requirements for an upgrade of the Sodium Removal System (SRS) control system. The upgrade is being performed to solve a number of maintainability and operability issues. The upgraded system will provide the same functions, controls and interlocks as the present system, and in addition provide enhanced functionality in areas discussed in this document.

  14. --No Title--

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

    to control lighting." (ix) Daylighting (sidelighting, skylights, or tubular daylight devices). "The TRACE 700 software can model daylighting." (x) Improved fan system...

  15. Microsoft Word - qs_trace-700_v6-2-4.docx

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

    to control lighting." (ix) Daylighting (sidelighting, skylights, or tubular daylight devices). "The TRACE 700 software can model daylighting." (x) Improved fan system...

  16. Tax Deduction Qualified Software: TRACE 700 version 6.3.0

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

    to control lighting." (ix) Daylighting (sidelighting, skylights, or tubular daylight devices). "The TRACE 700 software can model daylighting." (x) Improved fan system...

  17. Tax Deduction Qualified Software TRACE 700 version 6.3.0

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

    to control lighting." (ix) Daylighting (sidelighting, skylights, or tubular daylight devices). "The TRACE 700 software can model daylighting." (x) Improved fan system...

  18. Model Based Control Refrigeration Systems

    E-Print Network [OSTI]

    Model Based Control of Refrigeration Systems Ph.D. Thesis Lars Finn Sloth Larsen Central R & D University, Denmark. The work has been carried out at the Central R&D - Refrigeration and Air Conditioning The subject for this Ph.D. thesis is model based control of refrigeration systems. Model based control covers

  19. Magnetospheric application of high-altitude long-duration balloon technology: Daylight auroral observations

    E-Print Network [OSTI]

    Lummerzheim, Dirk

    Magnetospheric application of high-altitude long-duration balloon technology: Daylight auroral; accepted 12 February 2007 Abstract Daylight auroral imaging is a proposed application of the NASA high

  20. Graphical Representation of Climate-Based Daylight Performance to Support Architectural Design

    E-Print Network [OSTI]

    Kleindienst, Siân

    Many conventional daylighting design tools are limited in that each simulation represents only one time of year and time of day (or a single, theoretical overcast sky condition). Since daylight is so variable – due to the ...

  1. Question of the Week: How Do You Feel About the Extended Daylight...

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

    Feel About the Extended Daylight Saving Time? Question of the Week: How Do You Feel About the Extended Daylight Saving Time? March 12, 2009 - 6:00am Addthis Have you been drinking...

  2. Historical Survey of Daylighting Calculations Methods and Their Use in Energy Performance Simulations

    E-Print Network [OSTI]

    Kota, S.; Haberl, J. S.

    This paper traces the historical development of different daylighting calculation methods. Over the years there have been several developments in daylighting calculation methods. The last two decades have seen a number of new ideas and approaches...

  3. On Cyber Security for Networked Control Systems

    E-Print Network [OSTI]

    Amin, Saurabh

    2011-01-01T23:59:59.000Z

    her students on security of process control systems. I amcyber-security tools for process control systems. In theon the security mechanisms of process control systems, few

  4. Nonlinear Control of Delay and PDE Systems

    E-Print Network [OSTI]

    Bekiaris-Liberis, Nikolaos

    delay systems, IEEE Transactions on Automatic Control, 56 (lag systems, IEEE Transactions on Automatic Control, 31 (nonlinear systems, IEEE Transactions on Automatic Control,

  5. OCTOBER 2013 IEEE CONTROL SYSTEMS MAGAZINE 23 PEOPLE IN CONTROL

    E-Print Network [OSTI]

    Benmei, Chen

    -related journals including Automatica, Systems and Control Letters, and IEEE Transac- tions on Automatic Control Transactions on Automatic Control, Automatica, System and Control Letters, and European Journal of ControlOCTOBER 2013 « IEEE CONTROL SYSTEMS MAGAZINE 23 PEOPLE IN CONTROL « I n this issue of IEEE Control

  6. N Controller Target System

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Arch Evaluator Adaptation Engine Model Manager Adaptation Executor Running System System API System Layer Probes Resource Discovery Effectors Running System System API System Layer Probes Resource COSMOS asynchronous push pull COSMOS (a)synchronous pull Local SCA binding Remote SCA binding (REST, RPC

  7. USING VIDEO FOR ANALYZING DAYLIGHT SIMULATION TOOLS Daniel C. Glaser1

    E-Print Network [OSTI]

    Varela, Carlos

    USING VIDEO FOR ANALYZING DAYLIGHT SIMULATION TOOLS Daniel C. Glaser1 , F. Whitney Smith2 , Barb socio-technical techniques can be employed to analyze video data of people using daylight simulation, a classic daylighting analysis tool; and in the second a lighting professional is asked to use a new data

  8. Calculating correlated color temperatures across the entire gamut of daylight and skylight chromaticities

    E-Print Network [OSTI]

    Lee Jr., Raymond L.

    Calculating correlated color temperatures across the entire gamut of daylight and skylight daylight and skylight spectra to test an equation that accurately maps CIE 1931 chromaticities x and y by daylight and skylight. © 1999 Optical Society of America OCIS codes: 010.1290, 330.1710, 330.1730. 1

  9. Development of a new model to predict indoor daylighting : integration in CODYRUN software and validation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Development of a new model to predict indoor daylighting : integration in CODYRUN software in the scientific literature for determining indoor daylighting values. They are classified in three categories. The originality of our paper relies on the coupling of several simplified models of indoor daylighting

  10. P5.60B DERIVATION OF DAYLIGHT AND SOLAR IRRADIANCE DATA FROM SATELLITE OBSERVATIONS

    E-Print Network [OSTI]

    Heinemann, Detlev

    P5.60B DERIVATION OF DAYLIGHT AND SOLAR IRRADIANCE DATA FROM SATELLITE OBSERVATIONS A. Hammer, D project SATELLIGHT an attempt is made to use satellite methods to derive daylight and solar irradiance). In daylighting applications, knowledge of the lumi- nance distribution of the sky is of primary concern. Thus

  11. ACTIVITY OF HAWAIIAN REEF FISHES DURING THE EVENING AND MORNING TRANSITIONS BETWEEN DAYLIGHT AND DARKNESS

    E-Print Network [OSTI]

    ACTIVITY OF HAWAIIAN REEF FISHES DURING THE EVENING AND MORNING TRANSITIONS BETWEEN DAYLIGHT inactive at night, the latter mainly inactive in daylight. During active periods their behavior, with the diurnal species mostly inactive in darkness and the nocturnal species mostly inactive in daylight (Hobson

  12. Inverse Modeling Using a Wireless Sensor Network (WSN) for Personalized Daylight Harvesting

    E-Print Network [OSTI]

    Agogino, Alice M.

    Inverse Modeling Using a Wireless Sensor Network (WSN) for Personalized Daylight Harvesting Ryan: predictive: daylight harvesting: piecewise linear regression: building energy efficiency Abstract: Smart light levels, discretized by sub-hourly sun angles. Applied on two days of daylight and ten days

  13. SunCast: Fine-grained Prediction of Natural Sunlight Levels for Improved Daylight Harvesting

    E-Print Network [OSTI]

    Whitehouse, Kamin

    SunCast: Fine-grained Prediction of Natural Sunlight Levels for Improved Daylight Harvesting, USA {jklu,whitehouse}@cs.virginia.edu ABSTRACT Daylight harvesting is the use of natural sunlight to reduce the need for artificial lighting in buildings. The key challenge of daylight harvesting

  14. Robustness of circadian clocks to daylight fluctuations: hints from the picoeucaryote

    E-Print Network [OSTI]

    Lefranc, Marc

    1 Robustness of circadian clocks to daylight fluctuations: hints from the picoeucaryote in daylight intensity on the core circadian oscillator, a type of perturbation that has been rarely considered strategy to shield the circadian clock from daylight fluctuations by localizing coupling to the light

  15. Robustness of circadian clocks to daylight fluctuations: hints from the picoeucaryote

    E-Print Network [OSTI]

    1 Robustness of circadian clocks to daylight fluctuations: hints from the picoeucaryote a strategy to minimize the impact of fluctuations in daylight intensity on the core circadian oscillator daylight fluctuations by localizing coupling to the light during specific time intervals. In our model

  16. Time for a Change? It's not just Daylight Savings Time that should be abolished!

    E-Print Network [OSTI]

    1 Time for a Change? It's not just Daylight Savings Time that should be abolished! Sunday, March 11. It is just that the clocks are set differently! By government edict! I advocate not just abolishing Daylight of time zone and/or daylight savings time confusion. Every clock and wristwatch in the world would show

  17. Robustness of Circadian Clocks to Daylight Fluctuations: Hints from the Picoeucaryote Ostreococcus tauri

    E-Print Network [OSTI]

    Lefranc, Marc

    Robustness of Circadian Clocks to Daylight Fluctuations: Hints from the Picoeucaryote Ostreococcus in daylight intensity on the core circadian oscillator, a type of perturbation that has been rarely considered F, Bouget F-Y, et al. (2010) Robustness of Circadian Clocks to Daylight Fluctuations: Hints from

  18. Annual daylighting performance of a passive optical light shelf in sidelit perimeter zones of

    E-Print Network [OSTI]

    Annual daylighting performance of a passive optical light shelf in sidelit perimeter zones Government or any agency thereof or The Regents of the University of California. #12;1 Annual daylighting use in deep perimeter zones of buildings where the windows are subject to high daylight availability

  19. DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON

    E-Print Network [OSTI]

    Reimchen, Thomas E.

    DARKNESS, TWILIGHT, AND DAYLIGHT FORAGING SUCCESS OF BEARS (URSUS AMERICANUS) ON SALMON IN COASTAL (2000­2002). Bears (maximum 7 simultaneously) were primarily active during daylight near the onset with other bears (4%). Scavenging was greatest during daylight (19%) and lowest during darkness (3%). Bears

  20. D0 Cryo System Control System Autodialer

    SciTech Connect (OSTI)

    Urbin, J.; /Fermilab

    1990-04-17T23:59:59.000Z

    The DO cryogenic system is controlled by a TI565-PLC based control system. This allows the system to be unmanned when in steady state operation. System experts will need to be contacted when system parameters exceed normal operating points and reach alarm setpoints. The labwide FIRUS system provides one alarm monitor and communication link. An autodialer provides a second and more flexible alarm monitor and communication link. The autodialer monitors contact points in the control system and after receiving indication of an alarm accesses a list of experts which it calls until it receives an acknowledgement. There are several manufacturers and distributors of autodialer systems. This EN explains the search process the DO cryo group used to fmd an autodialer system that fit the cryo system's needs and includes information and specs for the unit we chose.

  1. Distributed vs. Centralized Power Systems Frequency Control

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    Distributed vs. Centralized Power Systems Frequency Control Martin Andreasson12 , Dimos V control of electrical power systems. We propose a distributed controller which retains the reference class of large- scale systems are electrical power systems, which employ automatic generation control

  2. Optimal Control of Distillation Systems

    E-Print Network [OSTI]

    Chatterjee, N.; Suchdeo, S. R.

    1984-01-01T23:59:59.000Z

    The optimum performance of a distillation system can be evaluated by examining the product purities, the product recoveries, and the system's capability to respond to small or large, expected or unexpected, plant disturbances. An optimal control...

  3. Computerized Control of Environmental Systems 

    E-Print Network [OSTI]

    Gatti, F. L.

    1980-01-01T23:59:59.000Z

    . Optimized conditions for products, people im prove moral, decrease waste. Automatic monitoring of systems parameters. Metering of utilities. Boiler controls Alternate energy source allocation. 2.0 OPERATING SYSTEMS PROVE PRACTICAL WHEN MEASURED...

  4. Fluid delivery control system

    DOE Patents [OSTI]

    Hoff, Brian D.; Johnson, Kris William; Algrain, Marcelo C.; Akasam, Sivaprasad

    2006-06-06T23:59:59.000Z

    A method of controlling the delivery of fluid to an engine includes receiving a fuel flow rate signal. An electric pump is arranged to deliver fluid to the engine. The speed of the electric pump is controlled based on the fuel flow rate signal.

  5. Virtual Control Systems Environment (VCSE)

    SciTech Connect (OSTI)

    Atkins, Will

    2012-10-08T23:59:59.000Z

    Will Atkins, a Sandia National Laboratories computer engineer discusses cybersecurity research work for process control systems. Will explains his work on the Virtual Control Systems Environment project to develop a modeling and simulation framework of the U.S. electric grid in order to study and mitigate possible cyberattacks on infrastructure.

  6. Virtual Control Systems Environment (VCSE)

    ScienceCinema (OSTI)

    Atkins, Will

    2014-02-26T23:59:59.000Z

    Will Atkins, a Sandia National Laboratories computer engineer discusses cybersecurity research work for process control systems. Will explains his work on the Virtual Control Systems Environment project to develop a modeling and simulation framework of the U.S. electric grid in order to study and mitigate possible cyberattacks on infrastructure.

  7. Daylight quantum key distribution over 1.6 km

    E-Print Network [OSTI]

    W. T. Buttler; R. J. Hughes; S. K. Lamoreaux; G. L. Morgan; J. E. Nordholt; C. G. Peterson

    2000-01-25T23:59:59.000Z

    Quantum key distribution (QKD) has been demonstrated over a point-to-point $\\sim1.6$-km atmospheric optical path in full daylight. This record transmission distance brings QKD a step closer to surface-to-satellite and other long-distance applications.

  8. Personalized HVAC control system

    E-Print Network [OSTI]

    Feldmeier, Mark Christopher

    We present a novel method of building comfort control, focused around the occupant. Custom sensing, communication, and actuation hardware were developed to locate users in a building, and measure various parameters directly ...

  9. Assessing the Feasibility of Creek Daylighting in San Francisco, Part I: A Synthesis of Lessons Learned from Existing Urban Daylighting Projects

    E-Print Network [OSTI]

    Smith, Brooke Ray

    2007-01-01T23:59:59.000Z

    Factors in Environmental Restoration: Strawberry Creek andBaxter Creek. Water Resource Center Archives, University ofNiazi. 2005. Blackberry Creek Daylighting Project, Berkeley:

  10. Optimal control for biological movement systems

    E-Print Network [OSTI]

    Li, Weiwei

    2006-01-01T23:59:59.000Z

    Kalman. When is a linear control system optimal? Journal ofOptimal stationary control of linear systems with control-J. Mclane. Optimal stochastic control of linear systems with

  11. A hierarchal multilevel microprocessor control system

    E-Print Network [OSTI]

    Teverbaugh, Larry D

    1979-01-01T23:59:59.000Z

    architectural configurations of distributed systems are examined for their usefulness in process control. An implementation of a distributed control system was undertaken in an effort to investigate the problems associated with multiprocessor architectures. A... OF THE DEVELOPMENT AND APPLICATION OF MICROPROCESSOR TECHNOLOGY. PROCESS CONTROL AND THE COMPUTER Page Process Control Fundamentals Digital Control Systems. Centralized Computing. Distributed Systems. Distributed Control System Architecture. Star...

  12. Systems and Control Engineering

    E-Print Network [OSTI]

    Rollins, Andrew M.

    ), the automobile companies Ford, GM) computer companies (IBM, Lucent, Bellcore) by the aerospace industry (GE, JPL areas require cross-disciplinary tools and methods for their solution. The Bachelor of Science program include the modeling, analysis, optimization and control of complex biological, energy, and industrial

  13. Development of Building Automation and Control Systems

    E-Print Network [OSTI]

    Yang, Yang; Zhu, Qi; Maasoumy, Mehdi; Sangiovanni-Vincentelli, Alberto

    2012-01-01T23:59:59.000Z

    A design flow for building automation and control systems,’’Development of Building Automation and Control Systems Yangdesign of the build- ing automation system (including the

  14. Development of Building Automation and Control Systems

    E-Print Network [OSTI]

    Yang, Yang; Zhu, Qi; Maasoumy, Mehdi; Sangiovanni-Vincentelli, Alberto

    2012-01-01T23:59:59.000Z

    design flow for building automation systems that focuses onflow for building automation and control systems,’’ in Proc.Development of Building Automation and Control Systems Yang

  15. Integrated control system and method

    DOE Patents [OSTI]

    Wang, Paul Sai Keat; Baldwin, Darryl; Kim, Myoungjin

    2013-10-29T23:59:59.000Z

    An integrated control system for use with an engine connected to a generator providing electrical power to a switchgear is disclosed. The engine receives gas produced by a gasifier. The control system includes an electronic controller associated with the gasifier, engine, generator, and switchgear. A gas flow sensor monitors a gas flow from the gasifier to the engine through an engine gas control valve and provides a gas flow signal to the electronic controller. A gas oversupply sensor monitors a gas oversupply from the gasifier and provides an oversupply signal indicative of gas not provided to the engine. A power output sensor monitors a power output of the switchgear and provide a power output signal. The electronic controller changes gas production of the gasifier and the power output rating of the switchgear based on the gas flow signal, the oversupply signal, and the power output signal.

  16. Pump control system for windmills

    DOE Patents [OSTI]

    Avery, Don E. (45-437 Akimala St., Honolulu, HI 96744)

    1983-01-01T23:59:59.000Z

    A windmill control system having lever means, for varying length of stroke of the pump piston, and a control means, responsive to the velocity of the wind to operate the lever means to vary the length of stroke and hence the effective displacement of the pump in accordance with available wind energy, with the control means having a sensing member separate from the windmill disposed in the wind and displaceable thereby in accordance with wind velocity.

  17. Feedback control of spin systems

    E-Print Network [OSTI]

    Claudio Altafini

    2006-01-03T23:59:59.000Z

    The feedback stabilization problem for ensembles of coupled spin 1/2 systems is discussed from a control theoretic perspective. The noninvasive nature of the bulk measurement allows for a fully unitary and deterministic closed loop. The Lyapunov-based feedback design presented does not require spins that are selectively addressable. With this method, it is possible to obtain control inputs also for difficult tasks, like suppressing undesired couplings in identical spin systems.

  18. BIM-Centric Daylight Profiler for Simulation (BDP4SIM): A Methodology for Automated Product Model Decomposition and Recomposition for Climate-Based Daylighting Simulation

    E-Print Network [OSTI]

    Benjamin Welle; Zack Rogers; Martin Fischer; Benjamin Welle A; Zack Rogers B; Martin Fischer

    2012-01-01T23:59:59.000Z

    Flexible problem formulation is required for product model-based thermal analysis using multidisciplinary design optimization (MDO) environments for cost-effectiveness, accuracy, and scalability in the Architecture, Engineering, and Construction (AEC) industry. The integration of daylighting simulation into an MDO process, however, presents several implementation challenges. In current practice, the process of an architect, engineer, or daylighting consultant to determine how to analyze a given building design for daylighting performance is frequently subjective, time-consuming, and inconsistent. Furthermore, long simulation time requirements for daylighting significantly hinder the realization of many benefits from MDO. The determination of which spaces in a building are sufficiently different to warrant an independent daylighting analysis is based primarily on building

  19. Decentralized Control Framework for Networked Control Systems Ahmed Elmahdi

    E-Print Network [OSTI]

    Sun, Dengfeng

    understand and interact with large-scale decentralized modern control systems. To mention a few, large- opment of distributed control systems. These modern systems which include sensors and actuatorsDecentralized Control Framework for Networked Control Systems Ahmed Elmahdi , Ahmad F Taha

  20. Energy Use Intensity and its Influence on the Integrated Daylighting Design of a Large Net Zero Energy Building: Preprint

    SciTech Connect (OSTI)

    Guglielmetti , R.; Scheib, J.; Pless, S. D.; Torcellini , P.; Petro, R.

    2011-03-01T23:59:59.000Z

    Net-zero energy buildings generate as much energy as they consume and are significant in the sustainable future of building design and construction. The role of daylighting (and its simulation) in the design process becomes critical. In this paper we present the process the National Renewable Energy Laboratory embarked on in the procurement, design, and construction of its newest building, the Research Support Facility (RSF) - particularly the roles of daylighting, electric lighting, and simulation. With a rapid construction schedule, the procurement, design, and construction had to be tightly integrated; with low energy use. We outline the process and measures required to manage a building design that could expect to operate at an efficiency previously unheard of for a building of this type, size, and density. Rigorous simulation of the daylighting and the electric lighting control response was a given, but the oft-ignored disconnect between lighting simulation and whole-building energy use simulation had to be addressed. The RSF project will be thoroughly evaluated for its performance for one year; preliminary data from the postoccupancy monitoring efforts will also be presented with an eye toward the current efficacy of building energy and lighting simulation.

  1. Control system health test system and method

    DOE Patents [OSTI]

    Hoff, Brian D.; Johnson, Kris W.; Akasam, Sivaprasad; Baker, Thomas M.

    2006-08-15T23:59:59.000Z

    A method is provided for testing multiple elements of a work machine, including a control system, a component, a sub-component that is influenced by operations of the component, and a sensor that monitors a characteristic of the sub-component. In one embodiment, the method is performed by the control system and includes sending a command to the component to adjust a first parameter associated with an operation of the component. Also, the method includes detecting a sensor signal from the sensor reflecting a second parameter associated with a characteristic of the sub-component and determining whether the second parameter is acceptable based on the command. The control system may diagnose at least one of the elements of the work machine when the second parameter of the sub-component is not acceptable.

  2. Simulation for Pre-Visualizing and Tuning Lighting Controller Behavior

    E-Print Network [OSTI]

    Radke, Rich

    daylighting and lighting control algorithms for a given space. Keywords: smart buildings, smart lighting, glazing, and shading devices have been decided. This prevents the early exploration of lighting

  3. How to Select Lighting Controls for Offices and Public Buildings

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

    Controls For Offices and Public Buildings LT-8 PAGE 1 DECEMBER 2000 Definitions Daylight dimming employs sensors that detect ambient light levels and then allow ballasts to...

  4. Validation of the Algorithms Developed for Preliminary Prediction of Daylight Distribution in a Toplighted Atrium

    E-Print Network [OSTI]

    Boubekri, M.; Atif, M. R.; Boyer, L. L.

    1988-01-01T23:59:59.000Z

    VALIDATION OF THE ALGORITHMS DEVELOPED FOR PRELIMINARY PREDICTION OF DAYLIGHT DISTRIBUTION IN A TOPLIGHTED ATRIUM MOHAMED BOUBEKRI MORAD R. ATIF LESTER L. BOYER PhD Candidate PhD Student PhD, Professor Texas A&M University Texas MM University... to understand daylight distribution throughout an atrium space is essential to produce good designs. Simp1 ified daylight prediction algorithms for preliminary design of top1 ighted atriums under overcast and clear diffuse skies have been developed as part...

  5. Advanced Light Source control system

    SciTech Connect (OSTI)

    Magyary, S.; Chin, M.; Cork, C.; Fahmie, M.; Lancaster, H.; Molinari, P.; Ritchie, A.; Robb, A.; Timossi, C.

    1989-03-01T23:59:59.000Z

    The Advanced Light Source (ALS) is a third generation 1--2 GeV synchrotron radiation source designed to provide ports for 60 beamlines. It uses a 50 MeV electron linac and 1.5 GeV, 1 Hz, booster synchrotron for injection into a 1--2 GeV storage ring. Interesting control problems are created because of the need for dynamic closed beam orbit control to eliminate interaction between the ring tuning requirements and to minimize orbit shifts due to ground vibrations. The extremely signal sensitive nature of the experiments requires special attention to the sources of electrical noise. These requirements have led to a control system design which emphasizes connectivity at the accelerator equipment end and a large I/O bandwidth for closed loop system response. Not overlooked are user friendliness, operator response time, modeling, and expert system provisions. Portable consoles are used for local operation of machine equipment. Our solution is a massively parallel system with >120 Mbits/sec I/O bandwidth and >1500 Mips computing power. At the equipment level connections are made using over 600 powerful Intelligent Local Controllers (ILC-s) mounted in 3U size Eurocard slots using fiber-optic cables between rack locations. In the control room, personal computers control and display all machine variables at a 10 Hz rate including the scope signals which are collected though the control system. Commercially available software and industry standards are used extensively. Particular attention is paid to reliability, maintainability and upgradeability. 10 refs., 11 figs.

  6. Reactor control rod timing system

    DOE Patents [OSTI]

    Wu, Peter T. K. (Clifton Park, NY)

    1982-01-01T23:59:59.000Z

    A fluid driven jet-edge whistle timing system for control rods of a nuclear reactor for producing real-time detection of the timing of each control rod in its scram operation. An important parameter in reactor safety, particularly for liquid metal fast breeder reactors (LMFBR), is the time deviation between the time the control rod is released and the time the rod actually reaches the down position. The whistle has a nearly pure tone signal with center frequency (above 100 kHz) far above the frequency band in which the energy of the background noise is concentrated. Each control rod can be fitted with a whistle with a different frequency so that there is no ambiguity in differentiating the signal from each control rod.

  7. Reactor control rod timing system

    SciTech Connect (OSTI)

    Wu, P.T.

    1982-02-09T23:59:59.000Z

    A fluid driven jet-edge whistle timing system for control rods of a nuclear reactor for producing real-time detection of the timing of each control rod in its scram operation. An important parameter in reactor safety, particularly for liquid metal fast breeder reactors (LMFBR), is the time deviation between the time the control rod is released and the time the rod actually reaches the down position. The whistle has a nearly pure tone signal with center frequency (Above 100 kHz) far above the frequency band in which the energy of the background noise is concentrated. Each control rod can be fitted with a whistle with a different frequency so that there is no ambiguity in differentiating the signal from each control rod.

  8. The NSTX Central Instrumentation and Control System

    SciTech Connect (OSTI)

    G. Oliaro; J. Dong; K. Tindall; P. Sichta

    1999-12-17T23:59:59.000Z

    Earlier this year the National Spherical Torus Experiment (NSTX) at the Princeton Plasma Physics Laboratory achieved ''first plasma''. The Central Instrumentation and Control System was used to support plasma operations. Major elements of the system include the Process Control System, Plasma Control System, Network System, Data Acquisition System, and Synchronization System. This paper will focus on the Process Control System. Topics include the architecture, hardware interface, operator interface, data management, and system performance.

  9. PIECEWISE AFFINE SYSTEMS CONTROLLABILITY AND HYBRID OPTIMAL CONTROL

    E-Print Network [OSTI]

    Rondepierre, Aude

    PIECEWISE AFFINE SYSTEMS CONTROLLABILITY AND HYBRID OPTIMAL CONTROL Aude Rondepierre Laboratoire de.Rondepierre@imag.fr Keywords: Piecewise affine hybrid systems, polyhedral sets, controllability, optimal control synthesis difficulty is actually the synthesis of optimal feedback, even not solved for linear systems, except in some

  10. A Control Approach to Bandwidth Management in Networked Control Systems

    E-Print Network [OSTI]

    Brandt, Scott A.

    A Control Approach to Bandwidth Management in Networked Control Systems Manel Velasco, Josep M management in networked control systems that allows control loops to consume band- width according bandwidth. I. INTRODUCTION Modern embedded systems are expected to provide more functionality and better

  11. Optimizing Controller Location in Networked Control Systems with Packet Drops

    E-Print Network [OSTI]

    Optimizing Controller Location in Networked Control Systems with Packet Drops C. L. Robinson1 and P in answering these two questions is that analysis of optimality in networked control systems subject to random mechanisms for wireless networked control systems [8, 6, 5]. In this paper we consider the issue of optimal

  12. OPTIMAL CONTROL WITH PACKET DROPS IN NETWORKED CONTROL SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    OPTIMAL CONTROL WITH PACKET DROPS IN NETWORKED CONTROL SYSTEMS Flavia Felicioni*, François Simonot optimization 1. INTRODUCTION1 With the progress of networking technology, more and more control systems are now: The stability and performance of a networked control system are strongly influenced by the network delay

  13. Hamiltonian Control Systems Delft University of Technology

    E-Print Network [OSTI]

    Knobloch,Jürgen

    of energy). #12;March 12, 2012 3 Hamiltonian Control Systems Port-Based Modeling of Physical Systems How Hamiltonian Control Systems Port-Based Modeling of Physical Systems #12;March 12, 2012 5 Hamiltonian Control Hamiltonian Control Systems Energy Storage How do we obtain H(x)? · Integral of power P = e f w.r.t. time

  14. Daylighting in schools: Improving student performance and health at a price schools can afford: Preprint

    SciTech Connect (OSTI)

    Plympton, P.; Conway, S.; Epstein, K.

    2000-06-14T23:59:59.000Z

    Over the next seven years, at least 5,000 new schools will be designed and constructed to meet the needs of American students in kindergarten through grade 12. National efforts are underway to encourage the use of daylighting, energy efficiency, and renewable energy technologies in school designs, which can significantly enhance the learning environment. Recent rigorous statistical studies, involving 21,000 students in three states, reveal that students perform better in daylit classrooms and indicate the health benefits of daylighting. This paper discusses the evidence regarding daylighting and student performance and development, and presents four case studies of schools that have cost effectively implemented daylighting into their buildings.

  15. Proton beam therapy control system

    DOE Patents [OSTI]

    Baumann, Michael A; Beloussov, Alexandre V; Bakir, Julide; Armon, Deganit; Olsen, Howard B; Salem, Dana

    2013-12-03T23:59:59.000Z

    A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

  16. Proton beam therapy control system

    DOE Patents [OSTI]

    Baumann, Michael A; Beloussov, Alexandre V; Bakir, Julide; Armon, Deganit; Olsen, Howard B; Salem, Dana

    2013-06-25T23:59:59.000Z

    A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

  17. Proton beam therapy control system

    DOE Patents [OSTI]

    Baumann, Michael A. (Riverside, CA); Beloussov, Alexandre V. (Bernardino, CA); Bakir, Julide (Alta Loma, CA); Armon, Deganit (Redlands, CA); Olsen, Howard B. (Colton, CA); Salem, Dana (Riverside, CA)

    2008-07-08T23:59:59.000Z

    A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

  18. Proton beam therapy control system

    DOE Patents [OSTI]

    Baumann, Michael A. (Riverside, CA); Beloussov, Alexandre V. (San Bernardino, CA); Bakir, Julide (Alta Loma, CA); Armon, Deganit (Longmeadow, MA); Olsen, Howard B. (Irvine, CA); Salem, Dana (Riverside, CA)

    2010-09-21T23:59:59.000Z

    A tiered communications architecture for managing network traffic in a distributed system. Communication between client or control computers and a plurality of hardware devices is administered by agent and monitor devices whose activities are coordinated to reduce the number of open channels or sockets. The communications architecture also improves the transparency and scalability of the distributed system by reducing network mapping dependence. The architecture is desirably implemented in a proton beam therapy system to provide flexible security policies which improve patent safety and facilitate system maintenance and development.

  19. Applicability of daylighting computer modeling in real case studies: Comparison between measured and simulated daylight availability and lighting consumption. Building and Environment

    E-Print Network [OSTI]

    A. D. Atif

    this paper is published in / Une version de ce document se trouve dans : IEA (International Energy Agency) Task 21 / Annex 29: Daylight in Buildings, November 1998, 68 pp. www.nrc.ca/irc/ircpubs NRCC-42862 Subtask C: Daylighting Design Tools T21/C1-21/CAN/98-11 Applicability of Daylighting Computer Modeling in Real Case Studies: Comparison between Measured and Simulated Daylight Availability and Lighting Consumption A report of IEA SHC Task 21 / IEA ECBCS Annex 29 Daylight in Buildings Subtask C: Daylighting Design Tools Report T21/C1-21/CAN/98-11 Applicability of Daylighting Computer Modeling in Real Case Studies: Comparison between Measured and Simulated Daylight Availability and Lighting Consumption by Anca D. Galasiu * Morad R. Atif * A report of IEA SHC Task 21 / IEA ECBCS Annex 29 * National Research Council Canada, Institute for Research in Construction, Indoor Environment Research Program Subtask C: Daylighting Design Tools Report T21/C1-21/CAN/98-11 IEA Solar Heating and Cooling Programme (IEA SHC) The International Energy Agency (IEA) was established in 1974 as an autonomous agency within the framework of the Economic Cooperation and Development (OECD) to carry out a comprehensive program of energy cooperation among its 24 member countries and the Commission of the European Communities. An important part of the Agency's program involves collaboration in the research, development and demonstration of new energy technologies to reduce excessive reliance on imported oil, increase long-term energy security and reduce greenhouse gas emissions. The IEA's R&D activities are headed by the Committee on Energy Research and Technology (CERT) and supported by a small Secretariat staff, headquartered in Paris. In addition, three Working Parties are charged with monitorin...

  20. Adaptive excitation control in power systems

    E-Print Network [OSTI]

    Chiu, Pei-Chen

    2006-08-16T23:59:59.000Z

    This thesis presents an adaptive excitation controller of power systems. The control law is derived by using model reference adaptive control (MRAC) or adaptive pole placement control (APPC) and an equilibrium tracking mechanism is implemented...

  1. HVDC control developments - addressing system requirements

    SciTech Connect (OSTI)

    Hauth, R.L.; Patel, H.S.; Piwko, R.J.

    1984-01-01T23:59:59.000Z

    This article describes typical high voltage direct current (HVDC) control systems and some of the new developments in the control area. HVDC control systems are showing their flexible characteristics as demonstrated, for example, by the new modulation, torsional damping, and alternating current voltage and reactive power controllers. Extensive studies are conducted to design and integrate such controllers into HVDC systems and to assure against any detrimental interactions within the total control system. 8 figures.

  2. Cyber Incidents Involving Control Systems

    SciTech Connect (OSTI)

    Robert J. Turk

    2005-10-01T23:59:59.000Z

    The Analysis Function of the US-CERT Control Systems Security Center (CSSC) at the Idaho National Laboratory (INL) has prepared this report to document cyber security incidents for use by the CSSC. The description and analysis of incidents reported herein support three CSSC tasks: establishing a business case; increasing security awareness and private and corporate participation related to enhanced cyber security of control systems; and providing informational material to support model development and prioritize activities for CSSC. The stated mission of CSSC is to reduce vulnerability of critical infrastructure to cyber attack on control systems. As stated in the Incident Management Tool Requirements (August 2005) ''Vulnerability reduction is promoted by risk analysis that tracks actual risk, emphasizes high risk, determines risk reduction as a function of countermeasures, tracks increase of risk due to external influence, and measures success of the vulnerability reduction program''. Process control and Supervisory Control and Data Acquisition (SCADA) systems, with their reliance on proprietary networks and hardware, have long been considered immune to the network attacks that have wreaked so much havoc on corporate information systems. New research indicates this confidence is misplaced--the move to open standards such as Ethernet, Transmission Control Protocol/Internet Protocol, and Web technologies is allowing hackers to take advantage of the control industry's unawareness. Much of the available information about cyber incidents represents a characterization as opposed to an analysis of events. The lack of good analyses reflects an overall weakness in reporting requirements as well as the fact that to date there have been very few serious cyber attacks on control systems. Most companies prefer not to share cyber attack incident data because of potential financial repercussions. Uniform reporting requirements will do much to make this information available to Department of Homeland Security (DHS) and others who require it. This report summarizes the rise in frequency of cyber attacks, describes the perpetrators, and identifies the means of attack. This type of analysis, when used in conjunction with vulnerability analyses, can be used to support a proactive approach to prevent cyber attacks. CSSC will use this document to evolve a standardized approach to incident reporting and analysis. This document will be updated as needed to record additional event analyses and insights regarding incident reporting. This report represents 120 cyber security incidents documented in a number of sources, including: the British Columbia Institute of Technology (BCIT) Industrial Security Incident Database, the 2003 CSI/FBI Computer Crime and Security Survey, the KEMA, Inc., Database, Lawrence Livermore National Laboratory, the Energy Incident Database, the INL Cyber Incident Database, and other open-source data. The National Memorial Institute for the Prevention of Terrorism (MIPT) database was also interrogated but, interestingly, failed to yield any cyber attack incidents. The results of this evaluation indicate that historical evidence provides insight into control system related incidents or failures; however, that the limited available information provides little support to future risk estimates. The documented case history shows that activity has increased significantly since 1988. The majority of incidents come from the Internet by way of opportunistic viruses, Trojans, and worms, but a surprisingly large number are directed acts of sabotage. A substantial number of confirmed, unconfirmed, and potential events that directly or potentially impact control systems worldwide are also identified. Twelve selected cyber incidents are presented at the end of this report as examples of the documented case studies (see Appendix B).

  3. Study of the relationship between indoor daylight environments and patient average length of stay (ALOS) in healthcare facilities

    E-Print Network [OSTI]

    Choi, Joon Ho

    2007-04-25T23:59:59.000Z

    This study investigates how indoor daylight environments affect patient Average Length of Stay (ALOS), by evaluating and analyzing daylight levels in patient rooms in comparison to their ALOS. The patient ALOS data were taken at one general hospital...

  4. A new approach in data visualization to integrate time and space variability of daylighting in the design process

    E-Print Network [OSTI]

    Yi, Lu, S.M. Massachusetts Institute of Technology

    2008-01-01T23:59:59.000Z

    Daylighting design has great impact on the performance and aesthetical quality of a work of architecture but requires many issues to be addressed during the design process. The way existing daylighting tools deliver data ...

  5. Daylight in façade renewal : using new metrics to inform the retrofitting of aging modern-ear façade types

    E-Print Network [OSTI]

    Rice, Edward Oren

    2006-01-01T23:59:59.000Z

    New methods for quantifying daylight are increasingly accessible to designers and planners. While these methods have enabled new building facades to better balance the admission of daylight with the maintenance of thermal ...

  6. Hamiltonian control systems From modeling to analysis and control

    E-Print Network [OSTI]

    Knobloch,Jürgen

    Hamiltonian control systems From modeling to analysis and control Arjan van der Schaft Johann-based modeling 3 Definition of port-Hamiltonian systems 4 Scattering: from power variables to wave variables 5, University of Groningen, the Netherlands DiHamiltonian control systems Elgersburg School, March, 2012 1 / 108

  7. Nanolens Window Coatings for Daylighting | 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 onYouTube YouTube Note: Since the.pdfBreaking ofOilNEW HAMPSHIRE BUILDS OFFNanolens Window Coatings for Daylighting

  8. Overview Models of the Example Space Renderings using the Architectural Daylighting Tool

    E-Print Network [OSTI]

    Camera B; Joshua Nasman; Barbara Cutler

    Our new TUI for architectural daylighting design allows multiple users to a) gather around a physical sketching environment and select from b) a set of wall primitives and window and material markers to c) build a rough sketch of an architectural design. A d) visualization of a daylighting simulation is projected onto these surfaces.

  9. Autonomous grain combine control system

    DOE Patents [OSTI]

    Hoskinson, Reed L.; Kenney, Kevin L.; Lucas, James R.; Prickel, Marvin A.

    2013-06-25T23:59:59.000Z

    A system for controlling a grain combine having a rotor/cylinder, a sieve, a fan, a concave, a feeder, a header, an engine, and a control system. The feeder of the grain combine is engaged and the header is lowered. A separator loss target, engine load target, and a sieve loss target are selected. Grain is harvested with the lowered header passing the grain through the engaged feeder. Separator loss, sieve loss, engine load and ground speed of the grain combine are continuously monitored during the harvesting. If the monitored separator loss exceeds the selected separator loss target, the speed of the rotor/cylinder, the concave setting, the engine load target, or a combination thereof is adjusted. If the monitored sieve loss exceeds the selected sieve loss target, the speed of the fan, the size of the sieve openings, or the engine load target is adjusted.

  10. Heat engine generator control system

    DOE Patents [OSTI]

    Rajashekara, Kaushik (Carmel, IN); Gorti, Bhanuprasad Venkata (Towson, MD); McMullen, Steven Robert (Anderson, IN); Raibert, Robert Joseph (Fishers, IN)

    1998-01-01T23:59:59.000Z

    An electrical power generation system includes a heat engine having an output member operatively coupled to the rotor of a dynamoelectric machine. System output power is controlled by varying an electrical parameter of the dynamoelectric machine. A power request signal is related to an engine speed and the electrical parameter is varied in accordance with a speed control loop. Initially, the sense of change in the electrical parameter in response to a change in the power request signal is opposite that required to effectuate a steady state output power consistent with the power request signal. Thereafter, the electrical parameter is varied to converge the output member speed to the speed known to be associated with the desired electrical output power.

  11. Heat engine generator control system

    DOE Patents [OSTI]

    Rajashekara, K.; Gorti, B.V.; McMullen, S.R.; Raibert, R.J.

    1998-05-12T23:59:59.000Z

    An electrical power generation system includes a heat engine having an output member operatively coupled to the rotor of a dynamoelectric machine. System output power is controlled by varying an electrical parameter of the dynamoelectric machine. A power request signal is related to an engine speed and the electrical parameter is varied in accordance with a speed control loop. Initially, the sense of change in the electrical parameter in response to a change in the power request signal is opposite that required to effectuate a steady state output power consistent with the power request signal. Thereafter, the electrical parameter is varied to converge the output member speed to the speed known to be associated with the desired electrical output power. 8 figs.

  12. Color and spectral analysis of daylight in southern Javier Hernandez-Andres, Javier Romero, and Juan L. Nieves

    E-Print Network [OSTI]

    Lee Jr., Raymond L.

    Color and spectral analysis of daylight in southern Europe Javier Herna´ndez-Andre´s, Javier Romero We have analyzed the colorimetric and spectral characteristics of 2600 daylight spectra (global), luminous efficacies, and relative UV and IR contents of Granada daylight. The chromaticity coordinates

  13. HTGR Resilient Control System Strategy

    SciTech Connect (OSTI)

    Lynne M. Stevens

    2010-09-01T23:59:59.000Z

    A preeminent objective for corporate and government organizations is the protection of major investments, which is attained by achieving state awareness, a comprehensive understanding of security and safety, for critical infrastructures. Given the dependence of critical infrastructure on control systems for automation, the integrity of these systems and their ability to provide owner/operators a high degree of state awareness is essential in attaining a high degree of investment protection and public acceptance. Operators as well as government are therefore burdened to ensure they have a timely understanding of the status of their plant or all plants, respectively, to ensure efficient operations and investment and public protection. “This characterization is a significant objective that must consider many aspects of instrumentation, control, and intelligent systems in order to achieve the required result. These aspects include sensory, communication, analysis, decision, and human system interfaces necessary to achieve fusion of data and presentation of results that will provide an understanding of what issues are important and why.

  14. The quantum systems control and the optimal control theory

    E-Print Network [OSTI]

    V. F. Krotov

    2008-05-22T23:59:59.000Z

    Mathematical theory of the quantum systems control is based on some ideas of the optimal control theory. These ideas are developed here as applied to these systems. The results obtained meet the deficiencies in the basis and algorithms of the control synthesis and expand the application of these methods.

  15. Control system health test system and method | OSTI, US Dept...

    Office of Scientific and Technical Information (OSTI)

    Control system health test system and method Re-direct Destination: A method is provided for testing multiple elements of a work machine, including a control system, a component, a...

  16. Instrumentation, Control, and Intelligent Systems

    SciTech Connect (OSTI)

    Not Available

    2005-09-01T23:59:59.000Z

    Abundant and affordable energy is required for U.S. economic stability and national security. Advanced nuclear power plants offer the best near-term potential to generate abundant, affordable, and sustainable electricity and hydrogen without appreciable generation of greenhouse gases. To that end, Idaho National Laboratory (INL) has been charged with leading the revitalization of nuclear power in the U.S. The INL vision is to become the preeminent nuclear energy laboratory with synergistic, world-class, multi-program capabilities and partnerships by 2015. The vision focuses on four essential destinations: (1) Be the preeminent internationally-recognized nuclear energy research, development, and demonstration laboratory; (2) Be a major center for national security technology development and demonstration; (3) Be a multi-program national laboratory with world-class capabilities; (4) Foster academic, industry, government, and international collaborations to produce the needed investment, programs, and expertise. Crucial to that effort is the inclusion of research in advanced instrumentation, control, and intelligent systems (ICIS) for use in current and advanced power and energy security systems to enable increased performance, reliability, security, and safety. For nuclear energy plants, ICIS will extend the lifetime of power plant systems, increase performance and power output, and ensure reliable operation within the system's safety margin; for national security applications, ICIS will enable increased protection of our nation's critical infrastructure. In general, ICIS will cost-effectively increase performance for all energy security systems.

  17. Self-Organizing and Optimal Control for Nonlinear Systems

    E-Print Network [OSTI]

    Dong, Wenjie

    2009-01-01T23:59:59.000Z

    Adaptive optimal control for continuous-time linear systemsOptimal Control of Uncertain Non- linear Systems Optimal control

  18. Center for Control System Security

    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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625govInstrumentstdmadapInactiveVisiting the TWPSuccess StoriesFebruaryMetalControl System Security Critical

  19. Control System Commissioning for Enhanced Building Operations

    E-Print Network [OSTI]

    Salsbury, T. I.; Singhal, A.

    2003-01-01T23:59:59.000Z

    This paper highlights the import role control systems play in the operation of modern buildings and describes ways to improve the final stage of commissioning. We also describe practical issues associated with modern IT-oriented control systems...

  20. Retrofit Diesel Emissions Control System Providing 50% NOxControl

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

    Retrofit Diesel Emissions Control System Providing 50% NOx Control D. Yee, B. Adair, A. Boleda, B. Berry, T. Caron, J. Cizeron, T. Kinney, K. Lundberg and R. Dalla Betta Catalytica...

  1. Re: Affordable Textbooks, Fall Semester Update In a message dated 10/28/2010 10:28:50 A.M. Eastern Daylight Time, nicole@studentpirgs.org

    E-Print Network [OSTI]

    Garfunkel, Eric

    .M. Eastern Daylight Time, nicole@studentpirgs.org writes: Hi everyone, There have been some exciting

  2. Access Control for SAR Systems Stephen Quirolgico

    E-Print Network [OSTI]

    Access Control for SAR Systems Stephen Quirolgico Vincent Hu Tom Karygiannis NIST IR 7815 #12;NIST Systems Stephen Quirolgico Vincent Hu Tom Karygiannis Computer Security Division Information Technology

  3. Sandia National Laboratories: power flow control system

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

    power flow control system ECIS-Princeton Power Systems, Inc.: Demand Response Inverter On March 19, 2013, in DETL, Distribution Grid Integration, Energy, Energy Surety, Facilities,...

  4. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

    SciTech Connect (OSTI)

    Martin E. Cobern

    2004-08-31T23:59:59.000Z

    The deep hard rock drilling environment induces severe vibrations into the drillstring, which can cause reduced rates of penetration (ROP) and premature failure of the equipment. The only current means of controlling vibration under varying conditions is to change either the rotary speed or the weight-on-bit (WOB). These changes often reduce drilling efficiency. Conventional shock subs are useful in some situations, but often exacerbate the problems. The objective of this project is development of a unique system to monitor and control drilling vibrations in a ''smart'' drilling system. This system has two primary elements: (1) The first is an active vibration damper (AVD) to minimize harmful axial, lateral and torsional vibrations. The hardness of this damper will be continuously adjusted using a robust, fast-acting and reliable unique technology. (2) The second is a real-time system to monitor drillstring vibration, and related parameters. This monitor adjusts the damper according to local conditions. In some configurations, it may also send diagnostic information to the surface via real-time telemetry. The AVD is implemented in a configuration using magnetorheological (MR) fluid. By applying a current to the magnetic coils in the damper, the viscosity of the fluid can be changed rapidly, thereby altering the damping coefficient in response to the measured motion of the tool. Phase I of this program entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype. Phase I of the project was completed by the revised end date of May 31, 2004. The objectives of this phase were met, and all prerequisites for Phase II have been completed.

  5. Control rod drive hydraulic system

    DOE Patents [OSTI]

    Ose, Richard A. (San Jose, CA)

    1992-01-01T23:59:59.000Z

    A hydraulic system for a control rod drive (CRD) includes a variable output-pressure CR pump operable in a charging mode for providing pressurized fluid at a charging pressure, and in a normal mode for providing the pressurized fluid at a purge pressure, less than the charging pressure. Charging and purge lines are disposed in parallel flow between the CRD pump and the CRD. A hydraulic control unit is disposed in flow communication in the charging line and includes a scram accumulator. An isolation valve is provided in the charging line between the CRD pump and the scram accumulator. A controller is operatively connected to the CRD pump and the isolation valve and is effective for opening the isolation valve and operating the CRD pump in a charging mode for charging the scram accumulator, and closing the isolation valve and operating the CRD pump in a normal mode for providing to the CRD through the purge line the pressurized fluid at a purge pressure lower than the charging pressure.

  6. A REMOTE CONTROLLED UNDERWATER PHOTOGRAPHIC SURVEILLANCE SYSTEM

    E-Print Network [OSTI]

    A REMOTE CONTROLLED UNDERWATER PHOTOGRAPHIC SURVEILLANCE SYSTEM by Paul J. Kruse, Jr. MarineKernan, Director A Remote Controlled Underwater Photographic Surveillance System by Paul J. Kruse, Jr. United. September 1964 #12;#12;CONTENTS Page Introduction 1 Remote controlled photographic system and accessories 1

  7. Fuzzy logic control and optimization system

    DOE Patents [OSTI]

    Lou, Xinsheng (West Hartford, CT)

    2012-04-17T23:59:59.000Z

    A control system (300) for optimizing a power plant includes a chemical loop having an input for receiving an input signal (369) and an output for outputting an output signal (367), and a hierarchical fuzzy control system (400) operably connected to the chemical loop. The hierarchical fuzzy control system (400) includes a plurality of fuzzy controllers (330). The hierarchical fuzzy control system (400) receives the output signal (367), optimizes the input signal (369) based on the received output signal (367), and outputs an optimized input signal (369) to the input of the chemical loop to control a process of the chemical loop in an optimized manner.

  8. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

    SciTech Connect (OSTI)

    Martin E. Cobern

    2005-07-27T23:59:59.000Z

    The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. The principal objectives of Phase II are: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in drilling laboratories and test wells. Work during this quarter centered on the rebuilding of the prototype using the improved valve design described in the last report. Most of the components have been received and assembly has begun. Testing is expected to resume in August. In April, a paper was presented at the American Association of Drilling Engineers National Technical Conference in Houston. The paper was well received, and several oilfield service and supply companies sent inquiries regarding commercial distribution of the system. These are currently being pursued, but none have yet been finalized.

  9. Power Systems Stability Control : Reinforcement Learning Framework

    E-Print Network [OSTI]

    Wehenkel, Louis

    1 Power Systems Stability Control : Reinforcement Learning Framework Damien Ernst, Member, IEEE systems. We describe some challenges in power system control and discuss how some of those challenges with the real power system and the off-line mode in which the interaction occurs with a simulation model

  10. Modeling and Analysis ofModeling and Analysis of Hybrid Control SystemsHybrid Control Systems

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    control systems, MOVEP, Bordeaux, 2006 Automatic gear boxAutomatic gear box #12;Karl H. Johansson, HybridModeling and Analysis ofModeling and Analysis of Hybrid Control SystemsHybrid Control Systems Karl.kth.se/~kallej MOVEP 2006, Bordeaux, France Karl H. Johansson, Hybrid control systems, MOVEP, Bordeaux

  11. Decentralized Control of Power Systems via Robust Control of Uncertain Markov Jump Parameter Systems

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    are regulated by small disturbance controllers whose gains are adjusted for variations in power system model due control of small disturbances in interconnected power systems. The linearized power system dynamic modelDecentralized Control of Power Systems via Robust Control of Uncertain Markov Jump Parameter

  12. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

    SciTech Connect (OSTI)

    Martin E. Cobern

    2006-09-30T23:59:59.000Z

    The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. The principal objectives of Phase II were: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in drilling laboratories and test wells. Phase II concluded on January 31, 2006, and the final report was issued. Work on Phase III of the project began during the previous quarter. Efforts this quarter have focused on the manufacture of the prototype and precommercial parts, field test planning and commercialization. The current extreme lead times quoted by oilfield machine shops for collar components, will delay the deployment of the field prototypes. The delivery date for five critical parts from one supplier has slipped to late November, which will preclude deployment for a field test before late December or early January. We are exploring whether we can take the partially made parts and complete them earlier in our own shop.

  13. A COMPRESSOR SURGE CONTROL SYSTEM: COMBINATION ACTIVE SURGE CONTROL SYSTEM AND SURGE AVOIDANCE SYSTEM

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    A COMPRESSOR SURGE CONTROL SYSTEM: COMBINATION ACTIVE SURGE CONTROL SYSTEM AND SURGE AVOIDANCE- trifugal compressor is presented. ASCS is a promising method to improve compressor operating area by stabilizing surge. However, this method is not applied yet in industrial compressors. Safety issue

  14. IN TELLIGENT CONTROLLING SYSTEM OF AQUICULTURE ENVIRONMENT

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    oxygen and fan and opening of windows and electromagnetism valve, The system hardware is composed of monitoring computer and PROFIBUS-DP field controlling units, which detects and controls the ecologicalIN TELLIGENT CONTROLLING SYSTEM OF AQUICULTURE ENVIRONMENT Deshen Zhao ,*1 1 Department of Electric

  15. Energy, Shading and Daylighting Analysis for the Austin Bergstrom International Airport Terminal

    E-Print Network [OSTI]

    Holder, L. M. III; Holder, L. M. IV

    2002-01-01T23:59:59.000Z

    Our firm was under contract with the City of Austin, Texas to perform energy analysis and analysis of the daylighting potential within the New Austin Bergstrom International Airport Terminal. Design of the Passenger Terminal Facility for the New...

  16. Experience of light : the use of an inverse method and a genetic algorithm in daylight design

    E-Print Network [OSTI]

    Chutarat, Acharawan

    2001-01-01T23:59:59.000Z

    Integration of daylight availability in time and architectural space is a critical element in achieving optimal comfort and productivity, as well as in minimizing energy consumption. In recent years, there has been an ...

  17. Time-varied daylighting performance to enable a goal-driven design process

    E-Print Network [OSTI]

    Kleindienst, Siân A. (Siân Alexandra)

    2010-01-01T23:59:59.000Z

    Due to the overwhelming number of decisions to be made during early stage design, there is a need for intuitive methods to communicate data so that it is quickly and easily understood by the designer. In daylighting analysis, ...

  18. Form and daylight as a creative medium : Church of John Paul II in South End, Boston

    E-Print Network [OSTI]

    Gruzewski, Jaroslaw

    1992-01-01T23:59:59.000Z

    This thesis is an architectural design project of a Catholic Church dedicated to Pope John Paul II. The main intention of this Thesis is to explore and clearly present daylighting methods and techniques and how important ...

  19. Daylighting Design Tools in Atria for Minimum Cooling Loads in Atrium Buildings

    E-Print Network [OSTI]

    Atif, M. R.; Boyer, L. L.; Degelman, L. O.; Claridge, D. E.

    The daylighting and sunlighting value of an atrium are considered the main reasons for including the atrium use in the built environment. However, most atria today are either overlit, which causes tremendous cooling loads, or underlit, requiring...

  20. Daylight Analysis with Microcomputers for School Buildings in a Hot, Humid Climate

    E-Print Network [OSTI]

    Leaver, J.; McQueen, T.

    1987-01-01T23:59:59.000Z

    Daylighting and other passive energy technologies are critical issues that should be considered in the early stages of building planning and architectural design. Both new design and retrofit of existing buildings benefit greatly by use...

  1. An Empirical Study and Analysis of Daylight Penetration Through a Light Plenum

    E-Print Network [OSTI]

    Hill, G. E.; Rowland, D.; Carlson, K.; Karpack, L.

    1985-01-01T23:59:59.000Z

    Lighting accounts for approximately 54% of the annual energy consumption of office buildings, and can effectively be reduced through daylighting. The simplest way to provide day lighting into a typical office space has been to use unilateral...

  2. Energy efficient commercial buildings : a study of natural daylighting in the context of adaptive reuse

    E-Print Network [OSTI]

    Crowley, John Stephen

    1982-01-01T23:59:59.000Z

    Daylighting is a powerful design element which can have a dramatic impact on people's perception of space, physical and psychological well-being as well as a building's annual and daily energy requirements. Understanding ...

  3. Downhole Vibration Monitoring & Control System

    SciTech Connect (OSTI)

    Martin E. Cobern

    2007-03-31T23:59:59.000Z

    The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. The principal objectives of Phase II were: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in a drilling laboratory. Phase II concluded on January 31, 2006, and the Phase II final report was issued. Work on Phase III of the project began during the first quarter, 2006. Efforts the current quarter have continued to focus on the manufacture of the prototype and precommercial parts, field test planning and commercialization. The continued extreme lead times quoted by oilfield machine shops for collar components significantly delayed the deployment of the prototype and precommercial units. All parts have now been received for two units, and all but one for the third. Mechanical assembly of the first two systems is complete and the electronics installation and laboratory testing will be finished in April. We have entered into a Memorandum of Understanding with a major US oilfield equipment supplier, which calls for their assisting with our field tests, in cash and in kind. We are close to signing a definitive agreement which includes the purchase of the three precommercial units. We had also signed a CRADA with the Rocky Mountain Oilfield Test Center (RMOTC), and scheduled a test at their site, The RMOTC drilling schedule continues to slip, and the test cannot begin until the first week of May. Based on these factors, we have requested a no-cost extension to July 31, 2007.

  4. Impact of Extended Daylight Saving Time on National Energy Consumption Report to Congress

    SciTech Connect (OSTI)

    Belzer, D. B.; Hadley, S. W.; Chin, S-M.

    2008-10-01T23:59:59.000Z

    The Energy Policy Act of 2005 (Pub. L. No. 109-58; EPAct 2005) amended the Uniform Time Act of 1966 (Pub. L. No. 89-387) to increase the portion of the year that is subject to Daylight Saving Time. (15 U.S.C. 260a note) EPAct 2005 extended the duration of Daylight Saving Time in the spring by changing its start date from the first Sunday in April to the second Sunday in March, and in the fall by changing its end date from the last Sunday in October to the first Sunday in November. (15 U.S.C. 260a note) EPAct 2005 also called for the Department of Energy to evaluate the impact of Extended Daylight Saving Time on energy consumption in the United States and to submit a report to Congress. (15 U.S.C. 260a note) This report presents the results of impacts of Extended Daylight Saving Time on the national energy consumption in the United States. The key findings are: (1) The total electricity savings of Extended Daylight Saving Time were about 1.3 Tera Watt-hour (TWh). This corresponds to 0.5 percent per each day of Extended Daylight Saving Time, or 0.03 percent of electricity consumption over the year. In reference, the total 2007 electricity consumption in the United States was 3,900 TWh. (2) In terms of national primary energy consumption, the electricity savings translate to a reduction of 17 Trillion Btu (TBtu) over the spring and fall Extended Daylight Saving Time periods, or roughly 0.02 percent of total U.S. energy consumption during 2007 of 101,000 TBtu. (3) During Extended Daylight Saving Time, electricity savings generally occurred over a three- to five-hour period in the evening with small increases in usage during the early-morning hours. On a daily percentage basis, electricity savings were slightly greater during the March (spring) extension of Extended Daylight Saving Time than the November (fall) extension. On a regional basis, some southern portions of the United States exhibited slightly smaller impacts of Extended Daylight Saving Time on energy savings compared to the northern regions, a result possibly due to a small, offsetting increase in household air conditioning usage. (4) Changes in national traffic volume and motor gasoline consumption for passenger vehicles in 2007 were determined to be statistically insignificant and therefore, could not be attributed to Extended Daylight Saving Time.

  5. An Analysis of Energy Reductions from the Use of Daylighting in Low-Cost Housing

    E-Print Network [OSTI]

    Rungchareonrat, N.

    AN ANALYSIS OF ENERGY REDUCTIONS FROM THE USE OF DAYLIGHTING IN LOW-COST HOUSING A Thesis by NAYARAT RUNGCHAREONRAT Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE August 2003 Major Subject: Architecture AN ANALYSIS OF ENERGY REDUCTIONS FROM THE USE OF DAYLIGHTING IN LOW-COST HOUSING A Thesis by NAYARAT RUNGCHAREONRAT...

  6. Cooling Energy and Cost Savings with Daylighting in a Hot and Humid Climate

    E-Print Network [OSTI]

    Arasteh, D.; Johnson, R.; Selkowitz, S.; Connell, D.

    1985-01-01T23:59:59.000Z

    (including glazing) was %eld constant at values consistent with ASHRAE 90 standards. Since the thermal conductance of the glazing (single or dou- ble) exceeds the maximum U , as the glass area increases, the conductance 0% the opaque wall is reduced...- ing to a saturation of useful daylight and no sig- nificant further savings in electric lighting energy. This daylight saturation effect begins at effective apertures between 0.10 and 0.25 for typ- ical curtain wall designs in a perimeter zone...

  7. AUTOMATIC VARIABLE VENTILATION CONTROL SYSTEMS BASED ON AIR QUALITY DETECTION

    E-Print Network [OSTI]

    Turiel, Isaac

    2011-01-01T23:59:59.000Z

    ~saon Automatic Variable Ventilation Control Systems Based79-3 Automatic variable ventilation control systems based onof automatic variable ventilation control systems, result in

  8. Economic and Distributed Model Predictive Control of Nonlinear Systems

    E-Print Network [OSTI]

    Heidarinejad, Mohsen

    2012-01-01T23:59:59.000Z

    hybrid systems. IEEE Transactions on Automatic Control, [6]nonlinear systems. IEEE Transactions on Automatic Control,of switched systems. IEEE Transactions on Automatic Control,

  9. Throttle And Brake Control Systems For Automatic Vehicle Following

    E-Print Network [OSTI]

    Ioannou, P.; Xu, Z.

    1994-01-01T23:59:59.000Z

    and Brake Control Systems for Automatic Vehicle Following P.and Brake Control Systems for Automatic Vehicle Following *Transit Systems, Proceedings of 1977 Joint Automatic Control

  10. Adding PCs to SLC Control System

    SciTech Connect (OSTI)

    Lahey, T.; Levitt, S.; MacKenzie, R.; Spencer, N.; Underwood, K.

    1993-05-01T23:59:59.000Z

    The SLAC Controls Department has interfaced IBM-Compatible PCs to the SLC Control System, for use by the Final Focus Test Beam (FFTB) experimenters, who are building new accelerator equipment and developing and testing it at their home institutions. They will bring the equipment to SLAC and integrate it into the control system using a new software package. The machine physicists and operators will use the existing SLC control system applications and database device types to control and monitor the equipment. The PCs support a limited control environment: they run DOS and exchange messages with the existing control system via TCP/IP over ethernet, using the new SLC Area Message Service. This mechanism will also allow SLC to implement other commercial device controllers that can communicate over ethernet and run the same software interface code.

  11. Closed Loop System with Feedback Control MISO control laws SISO control law

    E-Print Network [OSTI]

    Ben-Yakar, Adela

    Closed Loop System with Feedback Control MISO control laws SISO control law Switching Control demand · Two control modes for wind turbine: MISO & SISO · Proportional Integral (PI) feedback control Modes MISO SISO Inputs Blade Pitch Angle, Generator Torque Blade Pitch Angle Output Power Power

  12. CLIMATE-BASED DAYLIGHT PERFORMANCE: BALANCING VISUAL AND NON-VISUAL ASPECTS OF LIGHT INPUT

    E-Print Network [OSTI]

    M. Andersen; J. Mardaljevic; Nicolas Roy; Jens Christoffersen

    This study uses a domestic dwelling as the setting to investigate and explore the applicability of daylighting metrics for residential buildings, including the formulation of metrics for nonvisual effects. The simulation approach used to generate the performance data from which the metrics are derived is called climate-based daylight modelling (CBDM). This approach delivers predictions of various luminous quantities using sun and sky conditions that are derived from standardised annual meteorological datasets. Although there are uncertainties regarding the precise calibration, there is now sufficient empirical data to parameterise models that also simulate the non-visual aspects of daylight, e.g. for circadian entrainment and a general sense of ?alertness?. For these non-visual aspects, vertical illuminance at the eye was predicted using a modified climate-based daylight modelling approach. In the paper, we consider what relation there might be between the three aspects of daylight provision and if these relations appear to be complementary or conflicting in nature: for task; to reduce electric lighting usage; and, for non-visual effects. The implications for future building guidelines for daylighting are also discussed.

  13. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

    SciTech Connect (OSTI)

    Martin E. Cobern

    2006-05-01T23:59:59.000Z

    The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. The principal objectives of Phase II were: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in drilling laboratories and test wells. Phase II concluded on January 31, 2006. The month of January was devoted to the final preparations for, and conducting of testing of the DVMCS at TerraTek laboratories in Salt Lake City. This testing was concluded on January 27, 2006. Much of the effort in this period was then devoted to the analysis of the data and the preparation of the Phase II final report. The report was issued after the close of the period. Work on Phase III of the project began during this quarter. It has consisted of making some modifications in the prototype design to make it more suitable for field testing an more practical for commercial use. This work is continuing. The redesign effort, coupled with the current extreme lead times quoted by oilfield machine shops for collar components, will delay the deployment of the field prototypes. The precommercial prototypes are being developed in parallel, so the project should be completed per the current schedule.

  14. DOWNHOLE VIBRATION MONITORING & CONTROL SYSTEM

    SciTech Connect (OSTI)

    Martin E. Cobern

    2005-04-27T23:59:59.000Z

    The objective of this program is to develop a system to both monitor the vibration of a bottomhole assembly, and to adjust the properties of an active damper in response to these measured vibrations. Phase I of this program, which entailed modeling and design of the necessary subsystems and design, manufacture and test of a full laboratory prototype, was completed on May 31, 2004. The principal objectives of Phase II are: more extensive laboratory testing, including the evaluation of different feedback algorithms for control of the damper; design and manufacture of a field prototype system; and, testing of the field prototype in drilling laboratories and test wells. As a result of the lower than expected performance of the MR damper noted last quarter, several additional tests were conducted. These dealt with possible causes of the lack of dynamic range observed in the testing: additional damping from the oil in the Belleville springs; changes in properties of the MR fluid; and, residual magnetization of the valve components. Of these, only the last was found to be significant. By using a laboratory demagnetization apparatus between runs, a dynamic range of 10:1 was achieved for the damper, more than adequate to produce the needed improvements in drilling. Additional modeling was also performed to identify a method of increasing the magnetic field in the damper. As a result of the above, several changes were made in the design. Additional circuitry was added to demagnetize the valve as the field is lowered. The valve was located to above the Belleville springs to reduce the load placed upon it and offer a greater range of materials for its construction. In addition, to further increase the field strength, the coils were relocated from the mandrel to the outer housing. At the end of the quarter, the redesign was complete and new parts were on order. The project is approximately three months behind schedule at this time.

  15. Controlling biological systems: the lactose regulation system of Escherichia coli

    E-Print Network [OSTI]

    Pappas, George J.

    Controlling biological systems: the lactose regulation system of Escherichia coli A. Agung Julius hybrid model of the lactose regulation system of E. coli bacteria that capture important phenomena which In this paper we present a framework that consists of modeling, abstraction and control of a biological system

  16. Control system for fluid heated steam generator

    DOE Patents [OSTI]

    Boland, James F. (Bonneville County, ID); Koenig, John F. (Idaho Falls, ID)

    1985-01-01T23:59:59.000Z

    A control system for controlling the location of the nucleate-boiling region in a fluid heated steam generator comprises means for measuring the temperature gradient (change in temperature per unit length) of the heating fluid along the steam generator; means for determining a control variable in accordance with a predetermined function of temperature gradients and for generating a control signal in response thereto; and means for adjusting the feedwater flow rate in accordance with the control signal.

  17. Control system for fluid heated steam generator

    DOE Patents [OSTI]

    Boland, J.F.; Koenig, J.F.

    1984-05-29T23:59:59.000Z

    A control system for controlling the location of the nucleate-boiling region in a fluid heated steam generator comprises means for measuring the temperature gradient (change in temperature per unit length) of the heating fluid along the steam generator; means for determining a control variable in accordance with a predetermined function of temperature gradients and for generating a control signal in response thereto; and means for adjusting the feedwater flow rate in accordance with the control signal.

  18. Control Systems Security Publications Library | Department of...

    Energy Savers [EERE]

    Publications Library Control Systems Security Publications Library Publications Library Repository of documents, listed by topic. (Some of the documents in this section require...

  19. Wireless Demand Response Controls for HVAC Systems

    E-Print Network [OSTI]

    Federspiel, Clifford

    2010-01-01T23:59:59.000Z

    Response Controls for HVAC Systems Clifford Federspiel,tests. Figure 5: Specific HVAC electric power consumptioncontrol, demand response, HVAC, wireless Executive Summary

  20. R&D ERL: Controls System

    SciTech Connect (OSTI)

    Hoff, L.; Jamilkowski, J.

    2010-01-01T23:59:59.000Z

    This paper examines the equipment and software from which the controls system interface for the Energy Recovery Linac (ERL) will be implemented at the Brookhaven National Laboratory.

  1. Laser Inertial Fusion Energy Control Systems

    SciTech Connect (OSTI)

    Marshall, C; Carey, R; Demaret, R; Edwards, O; Lagin, L; Van Arsdall, P

    2011-03-18T23:59:59.000Z

    A Laser Inertial Fusion Energy (LIFE) facility point design is being developed at LLNL to support an Inertial Confinement Fusion (ICF) based energy concept. This will build upon the technical foundation of the National Ignition Facility (NIF), the world's largest and most energetic laser system. NIF is designed to compress fusion targets to conditions required for thermonuclear burn. The LIFE control systems will have an architecture partitioned by sub-systems and distributed among over 1000's of front-end processors, embedded controllers and supervisory servers. LIFE's automated control subsystems will require interoperation between different languages and target architectures. Much of the control system will be embedded into the subsystem with well defined interface and performance requirements to the supervisory control layer. An automation framework will be used to orchestrate and automate start-up and shut-down as well as steady state operation. The LIFE control system will be a high parallel segmented architecture. For example, the laser system consists of 384 identical laser beamlines in a 'box'. The control system will mirror this architectural replication for each beamline with straightforward high-level interface for control and status monitoring. Key technical challenges will be discussed such as the injected target tracking and laser pointing feedback. This talk discusses the the plan for controls and information systems to support LIFE.

  2. Robust adaptive control of switched systems

    E-Print Network [OSTI]

    El-Rifai, Khalid, 1979-

    2007-01-01T23:59:59.000Z

    In this thesis, robust adaptive controllers are developed for classes of switched nonlinear systems. Switched systems are those governed by differential equations, which undergo vector field switching due to sudden changes ...

  3. Networked control systems: a perspective from chaos

    E-Print Network [OSTI]

    Guofeng Zhang; Tongwen Chen

    2014-05-10T23:59:59.000Z

    In this paper, a nonlinear system aiming at reducing the signal transmission rate in a networked control system is constructed by adding nonlinear constraints to a linear feedback control system. Its stability is investigated in detail. It turns out that this nonlinear system exhibits very interesting dynamical behaviors: in addition to local stability, its trajectories may converge to a non-origin equilibrium or be periodic or just be oscillatory. Furthermore it exhibits sensitive dependence on initial conditions --- a sign of chaos. Complicated bifurcation phenomena are exhibited by this system. After that, control of the chaotic system is discussed. All these are studied under scalar cases in detail. Some difficulties involved in the study of this type of systems are analyzed. Finally an example is employed to reveal the effectiveness of the scheme in the framework of networked control systems.

  4. Transport control in deterministic ratchet system

    E-Print Network [OSTI]

    Woo-Sik Son; Jung-Wan Ryu; Dong-Uk Hwang; Soo-Young Lee; Young-Jai Park; Chil-Min Kim

    2006-12-17T23:59:59.000Z

    We study the control of transport properties in a deterministic inertia ratchet system via the extended delay feedback method. A chaotic current of a deterministic inertia ratchet system is controlled to a regular current by stabilizing unstable periodic orbits embedded in a chaotic attractor of the unperturbed system. By selecting an unstable periodic orbit, which has a desired transport property, and stabilizing it via the extended delay feedback method, we can control transport properties of the deterministic inertia ratchet system. Also, we show that the extended delay feedback method can be utilized for separation of particles in the deterministic inertia ratchet system as a particle's initial condition varies.

  5. TFTR diagnostic control and data acquisition system

    SciTech Connect (OSTI)

    Sauthoff, N.R.; Daniels, R.E.; PPL Computer Division

    1985-05-01T23:59:59.000Z

    General computerized control and data-handling support for TFTR diagnostics is presented within the context of the Central Instrumentation, Control and Data Acquisition (CICADA) System. Procedures, hardware, the interactive man--machine interface, event-driven task scheduling, system-wide arming and data acquisition, and a hierarchical data base of raw data and results are described. Similarities in data structures involved in control, monitoring, and data acquisition afford a simplification of the system functions, based on ''groups'' of devices. Emphases and optimizations appropriate for fusion diagnostic system designs are provided. An off-line data reduction computer system is under development.

  6. Applications of Feedback Control in Quantum Systems

    E-Print Network [OSTI]

    Kurt Jacobs

    2006-05-02T23:59:59.000Z

    We give an introduction to feedback control in quantum systems, as well as an overview of the variety of applications which have been explored to date. This introductory review is aimed primarily at control theorists unfamiliar with quantum mechanics, but should also be useful to quantum physicists interested in applications of feedback control. We explain how feedback in quantum systems differs from that in traditional classical systems, and how in certain cases the results from modern optimal control theory can be applied directly to quantum systems. In addition to noise reduction and stabilization, an important application of feedback in quantum systems is adaptive measurement, and we discuss the various applications of adaptive measurements. We finish by describing specific examples of the application of feedback control to cooling and state-preparation in nano-electro-mechanical systems and single trapped atoms.

  7. Assessing the Feasibility of Creek Daylighting in San Francisco, Part II: A Preliminary Analysis of Yosemite Creek

    E-Print Network [OSTI]

    Smith, Brooke Ray

    2007-01-01T23:59:59.000Z

    Lucas. 2006. Islais Creek reinterpreted: An exploration ofwould be triggered? If the creek conveys stormwater runoff,2004. Daylighting Islais Creek: a feasibility study.

  8. Software engineering practices for control system reliability

    SciTech Connect (OSTI)

    S. K. Schaffner; K. S White

    1999-04-01T23:59:59.000Z

    This paper will discuss software engineering practices used to improve Control System reliability. The authors begin with a brief discussion of the Software Engineering Institute's Capability Maturity Model (CMM) which is a framework for evaluating and improving key practices used to enhance software development and maintenance capabilities. The software engineering processes developed and used by the Controls Group at the Thomas Jefferson National Accelerator Facility (Jefferson Lab), using the Experimental Physics and Industrial Control System (EPICS) for accelerator control, are described. Examples are given of how their procedures have been used to minimized control system downtime and improve reliability. While their examples are primarily drawn from their experience with EPICS, these practices are equally applicable to any control system. Specific issues addressed include resource allocation, developing reliable software lifecycle processes and risk management.

  9. Expert Systems for Monitoring and Control

    E-Print Network [OSTI]

    Kuipers, Benjamin

    the next two weeks into the worst nuclear power plant accident in the United States --- the Three Mile­based systems that assist plant/process operators in the task of monitoring and control. The goal herei Expert Systems for Monitoring and Control Daniel L. Dvorak Department of Computer Sciences

  10. Report on the SLC control system

    SciTech Connect (OSTI)

    Phinney, N.

    1985-05-01T23:59:59.000Z

    The SLC control system is based on a VAX 11/780 Host computer with approximately 50 microprocessor clusters which provide distributed intelligence and control of all CAMAC interface modules. This paper will present an overview of the system including current status and a description of the software architecture and communication protocols. 8 refs.

  11. The BNL Accelerator Test Facility control system

    SciTech Connect (OSTI)

    Malone, R.; Bottke, I.; Fernow, R.; Ben-Zvi, I.

    1993-01-01T23:59:59.000Z

    Described is the VAX/CAMAC-based control system for Brookhaven National Laboratory's Accelerator Test Facility, a laser/linac research complex. Details of hardware and software configurations are presented along with experiences of using Vsystem, a commercial control system package.

  12. Control method for physical systems and devices

    DOE Patents [OSTI]

    Guckenheimer, John (Ithaca, NY)

    1997-01-01T23:59:59.000Z

    A control method for stabilizing systems or devices that are outside the control domain of a linear controller is provided. When applied to nonlinear systems, the effectiveness of this method depends upon the size of the domain of stability that is produced for the stabilized equilibrium. If this domain is small compared to the accuracy of measurements or the size of disturbances within the system, then the linear controller is likely to fail within a short period. Failure of the system or device can be catastrophic: the system or device can wander far from the desired equilibrium. The method of the invention presents a general procedure to recapture the stability of a linear controller, when the trajectory of a system or device leaves its region of stability. By using a hybrid strategy based upon discrete switching events within the state space of the system or device, the system or device will return from a much larger domain to the region of stability utilized by the linear controller. The control procedure is robust and remains effective under large classes of perturbations of a given underlying system or device.

  13. Optimized Periodic Control of Chaotic Systems

    E-Print Network [OSTI]

    Robert Mettin; Thomas Kurz

    1995-05-09T23:59:59.000Z

    In this work, we demonstrate the open-loop control of chaotic systems by means of optimized periodic signals. The use of such signals enables us to reduce control power significantly in comparison to simple harmonic perturbations. It is found that the stabilized periodic dynamics can be changed by small, specific alterations of the control signal. Thus, low power switching between different periodic states can be achieved without feedback. The robustness of the proposed control method against noise is discussed.

  14. Ground test accelerator control system software

    SciTech Connect (OSTI)

    Burczyk, L.; Dalesio, R.; Dingler, R.; Hill, J.; Howell, J.A.; Kerstiens, D.; King, R.; Kozubal, A.; Little, C.; Martz, V.; Rothrock, R.; Sutton, J.

    1988-01-01T23:59:59.000Z

    The GTA control system provides an environment in which the automation of a state-of-the-art accelerator can be developed. It makes use of commercially available computers, workstations, computer networks, industrial I/O equipment, and software. This system has built-in supervisory control (like most accelerator control systems), tools to support continuous control (like the process control industry), and sequential control for automatic startup and fault recovery (like few other accelerator control systems). Several software tools support these levels of control: a real-time operating system (VxWorks) with a real-time kernel (VRTX), a configuration database, a sequencer, and a graphics editor. VxWorks supports multitasking, fast context-switching, and preemptive scheduling. VxWorks/VRTX is a network-based development environment specifically designed to work in partnership with the UNIX operating system. A database provides the interface to the accelerator components. It consists of a run time library and a database configuration and editing tool. A sequencer initiates and controls the operation of all sequence programs (expressed as state programs). A graphics editor gives the user the ability to create color graphic displays showing the state of the machine in either text or graphics form. 11 refs., 2 figs.

  15. AUTOMATIC VARIABLE VENTILATION CONTROL SYSTEMS BASED ON AIR QUALITY DETECTION

    E-Print Network [OSTI]

    Turiel, Isaac

    2011-01-01T23:59:59.000Z

    saon Automatic Variable Ventilation Control Systems Based onL Kusuda, "Control Ventilation to Conserve Energy While t·79-3 Automatic variable ventilation control systems based on

  16. Zeros in linear multivariable control systems

    E-Print Network [OSTI]

    Ewing, Robert Fennell

    1974-01-01T23:59:59.000Z

    ZEROS IN LINEAR MULTIVARIABLE CONTROL SYSTEMS A Thesis by ROBERT FENNELL EWING Submitted to the Graduate College of Texas A8M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August 1974 Major... Control Systems (August 1974) Robert Fennell Ewing, B. S. , Texas A&M University Chairman of Advisory Committee: Dr. J. W. Howze This thesis examines the problem of altering the transfer function matrix of a linear, time-invariant, multivariable system...

  17. Concurrency control in heterogeneous distributed database systems

    E-Print Network [OSTI]

    Rahman, Md. Rezaur

    1992-01-01T23:59:59.000Z

    APPROACHES IN HDDBS . III. A Approaches Requiring Local DBMS Modihcations 17 19 III. B Approaches Without Local DBMS Modifications 22 IV A NEW APPROACH TO HDDBS CONCURRENCY CONTROL 30 IV. A The Concurrency Control Scheme 30 CIIA PTER Page IV. B... related to Database Systems in general which will be used consistently throughout this thesis. A Database system (DBS) consists of a set of dutiibiises (DB) which contain the data of interest and software, the database msnageinent system (DBMS), which...

  18. Robust adaptive control of HVDC systems

    SciTech Connect (OSTI)

    Reeve, J.; Sultan, M. (Univ. of Waterloo, Ontario (Canada))

    1994-07-01T23:59:59.000Z

    The transient performance of an HVDC power system is highly dependent on the parameters of the current/voltage regulators of the converter controls. In order to better accommodate changes in system structure or dc operating conditions, this paper introduces a new adaptive control strategy. The advantages of automatic tuning for continuous fine tuning are combined with predetermined gain scheduling in order to achieve robustness for large disturbances. Examples are provided for a digitally simulated back-to-back dc system.

  19. Feedwater temperature control methods and systems

    DOE Patents [OSTI]

    Moen, Stephan Craig; Noonan, Jack Patrick; Saha, Pradip

    2014-04-22T23:59:59.000Z

    A system for controlling the power level of a natural circulation boiling water nuclear reactor (NCBWR) is disclosed. The system, in accordance with an example embodiment of the present invention, may include a controller configured to control a power output level of the NCBWR by controlling a heating subsystem to adjust a temperature of feedwater flowing into an annulus of the NCBWR. The heating subsystem may include a steam diversion line configured to receive steam generated by a core of the NCBWR and a steam bypass valve configured to receive commands from the controller to control a flow of the steam in the steam diversion line, wherein the steam received by the steam diversion line has not passed through a turbine. Additional embodiments of the invention may include a feedwater bypass valve for controlling an amount of flow of the feedwater through a heater bypass line to the annulus.

  20. Optimal Control for Holonomic and Nonholonomic Mechanical Systems with Symmetry

    E-Print Network [OSTI]

    Marsden, Jerrold

    Optimal Control for Holonomic and Nonholonomic Mechanical Systems with Symmetry and Lagrangian Nonholonomic Mechanical Systems with Symmetry . . . . . . . . . . . . . . . 5 3 Optimal Control and Lagrangian.3 Optimal Control of a Holonomic System on a Principal Bundle . . . . . . . . . . . . 13 4 Optimal Control

  1. WIRELESS SENSOR NETWORK BASED CONTROL SYSTEM CONCIDERING COMMUNICATION COST

    E-Print Network [OSTI]

    WIRELESS SENSOR NETWORK BASED CONTROL SYSTEM CONCIDERING COMMUNICATION COST Yutaka Iino* Takeshi for wireless sensor network based control system, minimizing communication energy consumption. Some control, wireless sensor network technology has been developed rapidly, and various applications to control system

  2. System and method for controlling microgrid

    DOE Patents [OSTI]

    Bose, Sumit (Niskayuna, NY); Achilles, Alfredo Sebastian (Bavaria, DE); Liu, Yan (Ballston Lake, NY); Ahmed, Emad Ezzat (Munich, DE); Garces, Luis Jose (Niskayuna, NY)

    2011-07-19T23:59:59.000Z

    A system for controlling a microgrid includes microgrid assets and a tieline for coupling the microgrid to a bulk grid; and a tieline controller coupled to the tieline. At least one of the microgrid assets comprises a different type of asset than another one of the microgrid assets. The tieline controller is configured for providing tieline control signals to adjust active and reactive power in respective microgrid assets in response to commands from the bulk grid operating entity, microgrid system conditions, bulk grid conditions, or combinations thereof.

  3. Biological Control of Music Systems

    E-Print Network [OSTI]

    Miranda, Eduardo Reck

    ? Sonification for Auditory Display Some sort of compositional system Tenney's Meta-Hodos is current source Rock-Music #12;Music for Solo Performer Performed November 14, 1999 Used "Automates Ki" system February 2006 in TheUpgrade! Human multi-band EEG 8-channel sound reproduction Hybrid physical/source

  4. Control and Intelligent Systems, Vol. 33, No. 3, 2005 DECENTRALIZED FLIGHT CONTROL

    E-Print Network [OSTI]

    Liu, Hugh H.T.

    Control and Intelligent Systems, Vol. 33, No. 3, 2005 DECENTRALIZED FLIGHT CONTROL INTEGRATION- tation, and is well fitted into a systematic flight control systems development and engineering process Words Decentralized control, control integration, performance analysis 1. Introduction Modern flight

  5. Lecture 13: Control System Cyber Security

    E-Print Network [OSTI]

    CERN. Geneva

    2013-01-01T23:59:59.000Z

    Today, the industralized world lives in symbiosis with control systems: it depends on power distribution, oil production, public transport, automatic production lines. While the convenience is at hand, still too many control systems are designed without any security in mind, lack basic security protections, and are not even robust enough to withstand basic attacks. The Stuxnet worm attacking Siemens PLCs in 2010 was another close call. Attackers currently enjoy hacking control systems, and aim to switch lights off. This presentation shall recap the current situation and outline why the presenter is still waiting for a change in paradigm. Stefan Lüders, PhD, graduated from the Swiss Federal Institute of Technology in Zurich and joined CERN in 2002. Being initially developer of a common safety system used in all four experiments at the Large Hadron Collider, he gathered expertise in cyber-security issues of control systems. Consequently in 2004, he took over responsibilities in securing CERN's accelerator and...

  6. Stabilizing feedback controls for quantum systems

    E-Print Network [OSTI]

    Mazyar Mirrahimi; Ramon van Handel

    2005-11-10T23:59:59.000Z

    No quantum measurement can give full information on the state of a quantum system; hence any quantum feedback control problem is neccessarily one with partial observations, and can generally be converted into a completely observed control problem for an appropriate quantum filter as in classical stochastic control theory. Here we study the properties of controlled quantum filtering equations as classical stochastic differential equations. We then develop methods, using a combination of geometric control and classical probabilistic techniques, for global feedback stabilization of a class of quantum filters around a particular eigenstate of the measurement operator.

  7. Distributed expert systems for nuclear reactor control

    SciTech Connect (OSTI)

    Otaduy, P.J.

    1992-12-01T23:59:59.000Z

    A network of distributed expert systems is the heart of a prototype supervisory control architecture developed at the Oak Ridge National Laboratory (ORNL) for an advanced multimodular reactor. Eight expert systems encode knowledge on signal acquisition, diagnostics, safeguards, and control strategies in a hybrid rule-based, multiprocessing and object-oriented distributed computing environment. An interactive simulation of a power block consisting of three reactors and one turbine provides a realistic, testbed for performance analysis of the integrated control system in real-time. Implementation details and representative reactor transients are discussed.

  8. Distributed expert systems for nuclear reactor control

    SciTech Connect (OSTI)

    Otaduy, P.J.

    1992-01-01T23:59:59.000Z

    A network of distributed expert systems is the heart of a prototype supervisory control architecture developed at the Oak Ridge National Laboratory (ORNL) for an advanced multimodular reactor. Eight expert systems encode knowledge on signal acquisition, diagnostics, safeguards, and control strategies in a hybrid rule-based, multiprocessing and object-oriented distributed computing environment. An interactive simulation of a power block consisting of three reactors and one turbine provides a realistic, testbed for performance analysis of the integrated control system in real-time. Implementation details and representative reactor transients are discussed.

  9. Supporting multiple control systems at Fermilab

    SciTech Connect (OSTI)

    Nicklaus, Dennis J.; /Fermilab

    2009-10-01T23:59:59.000Z

    The Fermilab control system, ACNET, is used for controlling the Tevatron and all of its pre-accelerators. However, other smaller experiments at Fermilab have been using different controls systems, in particular DOOCS and EPICS. This paper reports some of the steps taken at Fermilab to integrate support for these outside systems. We will describe specific tools that we have built or adapted to facilitate interaction between the architectures. We also examine some of the difficulties that arise from managing this heterogeneous environment. Incompatibilities as well as common elements will be described.

  10. Optimal Integrated Control and Scheduling of Networked Control Systems with Communication

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Optimal Integrated Control and Scheduling of Networked Control Systems with Communication Abstract-- This paper addresses the problem of the optimal control and scheduling of Networked Control Systems over limited bandwidth deterministic networks. Multivariable linear systems subject

  11. Design of Control Systems for HVAC Applications

    E-Print Network [OSTI]

    Smith, A. L.

    1984-01-01T23:59:59.000Z

    The design and application of temperature control systems on a commercial building will bring the question to mind: Should the system be Pneumatic? Should it be Electronic? There is concern as to which system will be more appropriate to a certain...

  12. Online prediction and control nonlinear stochastic systems

    E-Print Network [OSTI]

    temperature in district heat- ing systems. · Prediction of power production from the wind turbines located and their application to prediction and control within district heating systems and for prediction of wind power. Here temperature in district heating systems', Techni- cal Report IMM-REP-2002-23, Informatics and Mathematical

  13. Design of Control Systems for HVAC Applications 

    E-Print Network [OSTI]

    Smith, A. L.

    1984-01-01T23:59:59.000Z

    The design and application of temperature control systems on a commercial building will bring the question to mind: Should the system be Pneumatic? Should it be Electronic? There is concern as to which system will be more appropriate to a certain...

  14. Effectiveness of External Window Attachments Based on Daylight Utilization and Cooling Load Reduction for Small Office Buildings in Hot Humid Climates

    E-Print Network [OSTI]

    Soebarto, V. I.; Degelman, L. O.

    1994-01-01T23:59:59.000Z

    reduce the amount of the daylight needed to supplement interior lighting. Therefore the objective of this study was to explore which strategy would give a balance between solar heat gain reduction and daylight utilization and result in the most energy...

  15. LNG fire and vapor control system technologies

    SciTech Connect (OSTI)

    Konzek, G.J.; Yasutake, K.M.; Franklin, A.L.

    1982-06-01T23:59:59.000Z

    This report provides a review of fire and vapor control practices used in the liquefied natural gas (LNG) industry. Specific objectives of this effort were to summarize the state-of-the-art of LNG fire and vapor control; define representative LNG facilities and their associated fire and vapor control systems; and develop an approach for a quantitative effectiveness evaluation of LNG fire and vapor control systems. In this report a brief summary of LNG physical properties is given. This is followed by a discussion of basic fire and vapor control design philosophy and detailed reviews of fire and vapor control practices. The operating characteristics and typical applications and application limitations of leak detectors, fire detectors, dikes, coatings, closed circuit television, communication systems, dry chemicals, water, high expansion foam, carbon dioxide and halogenated hydrocarbons are described. Summary descriptions of a representative LNG peakshaving facility and import terminal are included in this report together with typical fire and vapor control systems and their locations in these types of facilities. This state-of-the-art review identifies large differences in the application of fire and vapor control systems throughout the LNG industry.

  16. Spatial xenon oscillation control with expert systems

    SciTech Connect (OSTI)

    Alten, S. (Turkish Atomic Energy Authority, Ankara (Turkey)); Danofsky, R.A. (Iowa State Univ., Ames, IA (United States))

    1993-01-01T23:59:59.000Z

    Spatial power oscillations were attributed to the xenon transients in a reactor core in 1958 by Randall and St. John. These transients are usually initiated by a local reactivity insertion and lead to divergent axial flux oscillations in the core at constant power. Several heuristic manual control strategies and automatic control methods were developed to damp the xenon oscillations at constant power operations. However, after the load-follow operation of the reactors became a necessity of life, a need for better control strategies arose. Even though various advanced control strategies were applied to solve the xenon oscillation control problem for the load-follow operation, the complexity of the system created difficulties in modeling. The strong nonlinearity of the problem requires highly sophisticated analytical approaches that are quite inept for numerical solutions. On the other hand, the complexity of a system and heuristic nature of the solutions are the basic reasons for using artificial intelligence techniques such as expert systems.

  17. CITI Program Website Downtime for Software Upgrade Starting Monday 29 July at 11 a.m. U.S. Eastern Daylight Time, the CITI Program website will be

    E-Print Network [OSTI]

    .S. Eastern Daylight Time, the CITI Program website will be unavailable for approximately two to three days

  18. Control of cyber-physical systems using incremental properties of physical systems

    E-Print Network [OSTI]

    Zamani, Majid

    2012-01-01T23:59:59.000Z

    Hybrid Systems, IEEE Transaction on Automatic Control, 43(systems. IEEE Transactions on Automatic Control, [AS99] D.quan- tized control systems. IEEE Transactions on Automatic

  19. UMTRA Project document control system manual

    SciTech Connect (OSTI)

    Not Available

    1994-09-01T23:59:59.000Z

    This manual defines the Project Document Control System (PDCS) operated by the US DOE Uranium Mill tailings Remedial Action (UMTRA) project Office. The purpose of the PDCS is to provide an active and continuing program for acquiring, controlling, retaining, retrieving, retiring and disposing of all UMTRA Project documents. The PDCS also provides guidance and coordination in transferring documents by various UMTRA Projection document control centers to a central location.

  20. Variable emissivity laser thermal control system

    DOE Patents [OSTI]

    Milner, Joseph R. (Livermore, CA)

    1994-01-01T23:59:59.000Z

    A laser thermal control system for a metal vapor laser maintains the wall mperature of the laser at a desired level by changing the effective emissivity of the water cooling jacket. This capability increases the overall efficiency of the laser.

  1. Controlled manipulation using autonomous aerial systems

    E-Print Network [OSTI]

    Srikanth, Manohar B. (Manohar Balagatte)

    2013-01-01T23:59:59.000Z

    The main focus of the thesis is to design and control Autonomous Aerial Systems, also referred to as Unmanned Aerial Vehicles (UAVs). UAVs are able to hover and navigate in space using the thrust forces generated by the ...

  2. Artificial Immune System based urban traffic control

    E-Print Network [OSTI]

    Negi, Pallav

    2007-09-17T23:59:59.000Z

    traffic. The traffic was micro-simulated with each car on a two junction road system modeled individually. The cars themselves were programmed with 'personalities' to better simulate real traffic. A novel AIS was developed to detect, predict, and control...

  3. Control Systems Cyber Security Standards Support Activities

    SciTech Connect (OSTI)

    Robert Evans

    2009-01-01T23:59:59.000Z

    The Department of Homeland Security’s Control Systems Security Program (CSSP) is working with industry to secure critical infrastructure sectors from cyber intrusions that could compromise control systems. This document describes CSSP’s current activities with industry organizations in developing cyber security standards for control systems. In addition, it summarizes the standards work being conducted by organizations within the sector and provides a brief listing of sector meetings and conferences that might be of interest for each sector. Control systems cyber security standards are part of a rapidly changing environment. The participation of CSSP in the development effort for these standards has provided consistency in the technical content of the standards while ensuring that information developed by CSSP is included.

  4. Advanced topics in control systems theory II

    E-Print Network [OSTI]

    Nesic, Dragan

    Advanced topics in control systems theory II Lecture notes from FAP 2005 Editors: Antonio Lor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 1.8.2 Inverted Pendulum.4 The desired energy function Hd with kv = 0. . . . . . . . . . . . . . . . . . 32 1.5 Closed-loop responses

  5. System for controlling a hybrid energy system

    DOE Patents [OSTI]

    Hoff, Brian D.; Akasam, Sivaprasad

    2013-01-29T23:59:59.000Z

    A method includes identifying a first operating sequence of a repeated operation of at least one non-traction load. The method also includes determining first and second parameters respectively indicative of a requested energy and output energy of the at least one non-traction load and comparing the determined first and second parameters at a plurality of time increments of the first operating sequence. The method also includes determining a third parameter of the hybrid energy system indicative of energy regenerated from the at least one non-traction load and monitoring the third parameter at the plurality of time increments of the first operating sequence. The method also includes determining at least one of an energy deficiency or an energy surplus associated with the non-traction load of the hybrid energy system and selectively adjusting energy stored within the storage device during at least a portion of a second operating sequence.

  6. Qualitative Heterogeneous Control of Higher Order Systems ?

    E-Print Network [OSTI]

    Kuipers, Benjamin

    framework, a methodology for the design of a controlled hybrid system based on attractors and transitions between them. This framework designs a robust controller that can accommodate bounded amounts techniques. The local models used in the design process are qualitative, allowing the use of partial

  7. Qualitative Heterogeneous Control of Higher Order Systems

    E-Print Network [OSTI]

    Kuipers, Benjamin

    framework, a methodology for the design of a controlled hybrid system based on attractors and transitions between them. This framework designs a robust controller that can accommodate bounded amounts techniques. The local models used in the design process are qualitative, allowing the use of partial

  8. Predictive tracking control of constrained nonlinear systems

    E-Print Network [OSTI]

    Chisci, Luigi

    "diffusive" and "constant" parameter dynamics, by means of a simulation example. Finally Section 6 draws some of constrained nonlinear systems are proposed. Simulation experiments demonstrate the good tracking properties, the controller directly synthesizes the plant control input and, hence, has more freedom than the RG which can

  9. Optimal Power Management in Wireless Control Systems

    E-Print Network [OSTI]

    Plotkin, Joshua B.

    Optimal Power Management in Wireless Control Systems Konstantinos Gatsis, Student Member, IEEE to the controller over a wireless fading channel. The power allocated to these transmissions determines state. The goal is to design plant input and transmit power policies that minimize an infinite horizon

  10. Chapter 1: Sustainable Development--What and Why?

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

    Energy-efficient lighting (T-8 fluorescent) with daylighting controls Energy management system Daylighting Overhangs and side fins to block summer sun ...

  11. Power control system and method

    DOE Patents [OSTI]

    Steigerwald, Robert Louis; Anderson, Todd Alan

    2006-11-07T23:59:59.000Z

    A power system includes an energy harvesting device, a battery coupled to the energy harvesting device, and a circuit coupled to the energy harvesting device and the battery. The circuit is adapted to deliver power to a load by providing power generated by the energy harvesting device to the load without delivering excess power to the battery and to supplement the power generated by the energy harvesting device with power from the battery if the power generated by the energy harvesting device is insufficient to fully power the load. A method of operating the power system is also provided.

  12. Power control system and method

    DOE Patents [OSTI]

    Steigerwald, Robert Louis (Burnt Hills, NY) [Burnt Hills, NY; Anderson, Todd Alan (Niskayuna, NY) [Niskayuna, NY

    2008-02-19T23:59:59.000Z

    A power system includes an energy harvesting device, a battery coupled to the energy harvesting device, and a circuit coupled to the energy harvesting device and the battery. The circuit is adapted to deliver power to a load by providing power generated by the energy harvesting device to the load without delivering excess power to the battery and to supplement the power generated by the energy harvesting device with power from the battery if the power generated by the energy harvesting device is insufficient to fully power the load. A method of operating the power system is also provided.

  13. Parasitic load control system for exhaust temperature control

    DOE Patents [OSTI]

    Strauser, Aaron D. (Washington, IL); Coleman, Gerald N. (Peterborough, GB); Coldren, Dana R. (Fairbury, IL)

    2009-04-28T23:59:59.000Z

    A parasitic load control system is provided. The system may include an exhaust producing engine and a fuel pumping mechanism configured to pressurize fuel in a pressure chamber. The system may also include an injection valve configured to cause fuel pressure to build within the pressure chamber when in a first position and allow injection of fuel from the pressure chamber into one or more combustion chambers of the engine when in a second position. The system may further include a controller configured to independently regulate the pressure in the pressure chamber and the injection of fuel into the one or more combustion chambers, to increase a load on the fuel pumping mechanism, increasing parasitic load on the engine, thereby increasing a temperature of the exhaust produced by the engine.

  14. SNS Vacuum Instrumentation and Control System

    SciTech Connect (OSTI)

    J. Y. Tang; L. A. Smart; H. C. Hseuh; P. S. Marroquin; L. R. Dalesio; S. A. Lewis; C. A. Lionberger; K. Kishiyama; D. P. Gurd; M. Hechler; W. Schneider

    2001-11-01T23:59:59.000Z

    The Spallation Neutron Source (SNS) vacuum instrumentation and control systems are being designed at Lawrence Berkeley National Laboratory (LBNL), Brookhaven National Laboratory (BNL), Thomas Jefferson National Accelerator facility (TJNAF) and Los Alamos National Laboratory (LANL). Each participating lab is responsible for a different section of the machine: LBNL for the Front-End section, LANL for the warm LINAC section, TJNAF for the cold LINAC section and BNL for the Ring and transfer line sections. The vacuum instrumentation and control systems are scheduled to be installed and be in operation at Oak Ridge National Laboratory in 2004 or 2005. Although the requirements vary for different sections of the machine, a collaborative effort has been made to standardize vacuum instrumentation components and the global control system interfaces. This paper summarizes the design of each sub-section of vacuum instrumentation and control system and discusses SNS standards for Ion Pump and Gauge controllers, Programmable Logic Controller (PLC) interfaces, Ladder Logic programming and the SNS global control system interfaces.

  15. Time-optimal Control of Spin Systems

    E-Print Network [OSTI]

    Jan Swoboda

    2006-01-19T23:59:59.000Z

    The paper discusses various aspects of time-optimal control of quantum spin systems, modelled as right-invariant systems on a compact Lie group G. The main results are the reduction of such a system to an equivalent system on a homogeneous space G/H, and the explicit determination of optimal trajectories on G/H in the case where G/H is a Riemannian symmetric space. These results are mainly obtained by using methods from Lie theory and geometric control.

  16. A testbed for vehicular control systems

    E-Print Network [OSTI]

    Scott, Jon Zan

    1983-01-01T23:59:59.000Z

    Proportional Controller . Proportional Plus Derivative Controller CHAPTER V. DESCRIBING FUNCTION ANALYSIS 34 43 57 CHAPTER VI- PUTURE WORK CHAPTER VII. SUMMARY REFERENCES APPENDIX A FREQRE. FOR APPENDIX B IDENT. FTN APPENDIX C CNTRL1. FOR APPENDIX D... CALIB. FOR APPENDIX E DRVCTL. FOR 62 66 67 68 70 102 VITA 108 vi LIST OF FIGURES Figure Page Existing hydraulic system Pilot valve and steering valve det il 10 Existing electrical system Driver's area 14 Workbench from rear Workbench...

  17. Optimal Control of Building HVAC Systems in the Presence of Imperfect Predictions, ASME Dynamic System Control Conference

    E-Print Network [OSTI]

    Maasoumy, Mehdi

    2012-01-01T23:59:59.000Z

    optimal control design for HVAC systems,” in Dynamic Systemalgorithm design for hvac systems in energy efficient build-OPTIMAL CONTROL OF BUILDING HVAC SYSTEMS IN THE PRESENCE OF

  18. LED lamp color control system and method

    DOE Patents [OSTI]

    Gaines, James; Clauberg, Bernd; Van Erp, Josephus A.M.

    2013-02-05T23:59:59.000Z

    An LED lamp color control system and method including an LED lamp having an LED controller 58; and a plurality of LED channels 60 operably connected to the LED controller 58, each of the plurality of LED channels 60 having a channel switch 62 in series with at least one shunted LED circuit 83, the shunted LED circuit 83 having a shunt switch 68 in parallel with an LED source 80. The LED controller 58 determines whether the LED source 80 is in a feedback controllable range, stores measured optical flux for the LED source 80 when the LED source 80 is in the feedback controllable range, and bypasses storing the measured optical flux when the LED source 80 is not in the feedback controllable range.

  19. E-Print Network 3.0 - apollo extension system Sample Search Results

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

    Summary: Data: An Extension to the APOLLO Software Package. International Journal of Remote Sensing, Vol. 10... cooling systems and daylighting in buildings are expected to...

  20. MANAGEMENT CONTROL SYSTEM IN PUBLIC

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    essential aspect of the public management device: compliance with legal rules. Gradually, a new objective of the budgetary system. Thus, public organizations need to create new tools to manage their activities or use, despite the number of reforms adopted in the name of New Public Management, numerous authors also noted

  1. BUILDING RESEARCH & INFORMATION (2008) Paper in press (mock proof) expected to appear in Vol 36 No 6 (Nov 2008) An intuitive daylighting performance

    E-Print Network [OSTI]

    Varela, Carlos

    No 6 (Nov 2008) An intuitive daylighting performance analysis and optimization approach M. Andersen1 of daylighting considerations into the design process requires many issues to be addressed simultaneously quantitative and qualitative performance criteria using daylighting analysis data in various forms

  2. CLTC is a not-for-profit research, development and demonstration facility leading innovations in energy-efficient lighting and daylighting technologies.

    E-Print Network [OSTI]

    California at Davis, University of

    in energy-efficient lighting and daylighting technologies. Collaborating with partners in government common ways CLTC utilizes funding to advance the science of energy-efficient lighting and daylighting and field test emerging lighting and daylighting technologies. Demonstrations help vet the performance

  3. Evaluation of the Daylight Cycle of Model-Predicted Cloud Amount and Condensed Water Path over Europe with Observations from MSG SEVIRI

    E-Print Network [OSTI]

    Stoffelen, Ad

    Evaluation of the Daylight Cycle of Model-Predicted Cloud Amount and Condensed Water Path over accurate information on diurnal cycles during daylight hours of cloud properties over land and ocean surfaces. This paper evaluates the daylight cycle of CA and CWP as predicted by the Regional Atmospheric

  4. august 2014 IEEE CONTROL SYSTEMS MAGAZINE 37 PEOPLE IN CONTROL

    E-Print Network [OSTI]

    Fainman, Yeshaiahu

    is the alfred Fitler Moore Professor of Net- work science at the university of Pennsylvania (Penn), cur- rently, tehran, Iran, in February 1995, an M.s. in electrical and computer engineering from the university of New Mexico in albuquerque in December 1998, and a Ph.D. in control and dynamical systems from the Cali

  5. Passive environmental temperature control system

    DOE Patents [OSTI]

    Corliss, John M. (Columbus, OH); Stickford, George H. (Columbus, OH)

    1981-01-01T23:59:59.000Z

    Passive environmental heating and cooling systems are described, which utilize heat pipes to transmit heat to or from a thermal reservoir. In a solar heating system, a heat pipe is utilized to carry heat from a solar heat absorber plate that receives sunlight, through a thermal insulation barrier, to a heat storage wall, with the outer end of the pipe which is in contact with the solar absorber being lower than the inner end. The inclining of the heat pipe assures that the portion of working fluid, such as Freon, which is in a liquid phase will fall by gravity to the outer end of the pipe, thereby assuring diode action that prevents the reverse transfer of heat from the reservoir to the outside on cool nights. In a cooling system, the outer end of the pipe which connects to a heat dissipator, is higher than the inner end that is coupled to a cold reservoir, to allow heat transfer only out of the reservoir to the heat dissipator, and not in the reverse direction.

  6. Secure control systems with application to cyber-physical systems

    SciTech Connect (OSTI)

    Dong, Jin [ORNL] [ORNL; Djouadi, Seddik M [ORNL] [ORNL; Nutaro, James J [ORNL] [ORNL; Kuruganti, Phani Teja [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    Control systems are computer-based systems with networked units consisting of sensors, actuators, control processing units, and communication devices. The role of control system is to interact, monitor, and control physical processes. Reactive power control is a fundamental issue in ensuring the security of the power network. It is claimed that Synchronous Condensers (SC) have been used at both distribution and transmission voltage levels to improve stability and to maintain voltages within desired limits under changing load conditions and contingency situations. Performance of PI controller corresponding to various tripping faults are analyzed for SC systems. Most of the eort in protecting these systems has been in protection against random failures or reliability. However, besides failures these systems are subject to various signal attacks for which new analysis are discussed here. When a breach does occur, it is necessary to react in a time commensurate with the physical dynamics of the system as it responds to the attack. Failure to act swiftly enough may result in undesirable, and possibly irreversible, physical eects. Therefore, it is meaningful to evaluate the security of a cyber-physical system, especially to protect it from cyber-attack. Illustrative numerical examples are provided together with an application to the SC systems.

  7. TREAT Reactor Control and Protection System

    SciTech Connect (OSTI)

    Lipinski, W.C.; Brookshier, W.K.; Burrows, D.R.; Lenkszus, F.R.; McDowell, W.P.

    1985-01-01T23:59:59.000Z

    The main control algorithm of the Transient Reactor Test Facility (TREAT) Automatic Reactor Control System (ARCS) resides in Read Only Memory (ROM) and only experiment specific parameters are input via keyboard entry. Prior to executing an experiment, the software and hardware of the control computer is tested by a closed loop real-time simulation. Two computers with parallel processing are used for the reactor simulation and another computer is used for simulation of the control rod system. A monitor computer, used as a redundant diverse reactor protection channel, uses more conservative setpoints and reduces challenges to the Reactor Trip System (RTS). The RTS consists of triplicated hardwired channels with one out of three logic. The RTS is automatically tested by a digital Dedicated Microprocessor Tester (DMT) prior to the execution of an experiment. 6 refs., 5 figs., 1 tab.

  8. Wireless Demand Response Controls for HVAC Systems

    SciTech Connect (OSTI)

    Federspiel, Clifford

    2009-06-30T23:59:59.000Z

    The objectives of this scoping study were to develop and test control software and wireless hardware that could enable closed-loop, zone-temperature-based demand response in buildings that have either pneumatic controls or legacy digital controls that cannot be used as part of a demand response automation system. We designed a SOAP client that is compatible with the Demand Response Automation Server (DRAS) being used by the IOUs in California for their CPP program, design the DR control software, investigated the use of cellular routers for connecting to the DRAS, and tested the wireless DR system with an emulator running a calibrated model of a working building. The results show that the wireless DR system can shed approximately 1.5 Watts per design CFM on the design day in a hot, inland climate in California while keeping temperatures within the limits of ASHRAE Standard 55: Thermal Environmental Conditions for Human Occupancy.

  9. Alarm system for a nuclear control complex

    DOE Patents [OSTI]

    Scarola, Kenneth (Windsor, CT); Jamison, David S. (Windsor, CT); Manazir, Richard M. (North Canton, CT); Rescorl, Robert L. (Vernon, CT); Harmon, Daryl L. (Enfield, CT)

    1994-01-01T23:59:59.000Z

    An advanced control room complex for a nuclear power plant, including a discrete indicator and alarm system (72) which is nuclear qualified for rapid response to changes in plant parameters and a component control system (64) which together provide a discrete monitoring and control capability at a panel (14-22, 26, 28) in the control room (10). A separate data processing system (70), which need not be nuclear qualified, provides integrated and overview information to the control room and to each panel, through CRTs (84) and a large, overhead integrated process status overview board (24). The discrete indicator and alarm system (72) and the data processing system (70) receive inputs from common plant sensors and validate the sensor outputs to arrive at a representative value of the parameter for use by the operator during both normal and accident conditions, thereby avoiding the need for him to assimilate data from each sensor individually. The integrated process status board (24) is at the apex of an information hierarchy that extends through four levels and provides access at each panel to the full display hierarchy. The control room panels are preferably of a modular construction, permitting the definition of inputs and outputs, the man machine interface, and the plant specific algorithms, to proceed in parallel with the fabrication of the panels, the installation of the equipment and the generic testing thereof.

  10. Secure Control Systems for the Energy Sector

    SciTech Connect (OSTI)

    Smith, Rhett; Campbell, Jack; Hadley, Mark

    2012-03-31T23:59:59.000Z

    Schweitzer Engineering Laboratories (SEL) will conduct the Hallmark Project to address the need to reduce the risk of energy disruptions because of cyber incidents on control systems. The goals is to develop solutions that can be both applied to existing control systems and designed into new control systems to add the security measures needed to mitigate energy network vulnerabilities. The scope of the Hallmark Project contains four primary elements: 1. Technology transfer of the Secure Supervisory Control and Data Acquisition (SCADA) Communications Protocol (SSCP) from Pacific Northwest National Laboratories (PNNL) to Schweitzer Engineering Laboratories (SEL). The project shall use this technology to develop a Federal Information Processing Standard (FIPS) 140-2 compliant original equipment manufacturer (OEM) module to be called a Cryptographic Daughter Card (CDC) with the ability to directly connect to any PC enabling that computer to securely communicate across serial to field devices. Validate the OEM capabilities with another vendor. 2. Development of a Link Authenticator Module (LAM) using the FIPS 140-2 validated Secure SCADA Communications Protocol (SSCP) CDC module with a central management software kit. 3. Validation of the CDC and Link Authenticator modules via laboratory and field tests. 4. Creation of documents that record the impact of the Link Authenticator to the operators of control systems and on the control system itself. The information in the documents can assist others with technology deployment and maintenance.

  11. Load frequency control of interconnected power systems with system constraints

    E-Print Network [OSTI]

    Choudhury, Md Ershadul H

    1993-01-01T23:59:59.000Z

    -Line Power Pu? 3. Governor- Turbine System 4. Overall Single-Area System Model 5. Two-Area System B. IEEE Models of Turbines snd Boilers 1. Reheat Turbine Model . 2. Governor Representation with Deadband 3. Boiler System C. Factors in Generating Unit... fluctuations and major generation or load disturbances. The processes involved are the dynamics of boilers, governors, turbines and their interactions with the power system. Governors and boilers as primary control units are responsible for maintaining...

  12. Stochastic Control Analysis for Biochemical Reaction Systems

    E-Print Network [OSTI]

    Kyung Hyuk Kim; Herbert M. Sauro

    2009-08-21T23:59:59.000Z

    In this paper, we investigate how stochastic reaction processes are affected by external perturbations. We describe an extension of the deterministic metabolic control analysis (MCA) to the stochastic regime. We introduce stochastic sensitivities for mean and covariance values of reactant concentrations and reaction fluxes and show that there exist MCA-like summation theorems among these sensitivities. The summation theorems for flux variances are shown to depend on the size of the measurement time window ($\\epsilon$), within which reaction events are counted for measuring a single flux. The degree of the $\\epsilon$-dependency can become significant for processes involving multi-time-scale dynamics and is estimated by introducing a new measure of time scale separation. This $\\epsilon$-dependency is shown to be closely related to the power-law scaling observed in flux fluctuations in various complex networks. We propose a systematic way to control fluctuations of reactant concentrations while minimizing changes in mean concentration levels. Such orthogonal control is obtained by introducing a control vector indicating the strength and direction of parameter perturbations leading to a sensitive control. We also propose a possible implication in the control of flux fluctuation: The control distribution for flux fluctuations changes with the measurement time window size, $\\epsilon$. When a control engineer applies a specific control operation on a reaction system, the system can respond contrary to what is expected, depending on the time window size $\\epsilon$.

  13. Comparison of Routable Control System Security Approaches

    SciTech Connect (OSTI)

    Edgar, Thomas W.; Hadley, Mark D.; Carroll, Thomas E.; Manz, David O.; Winn, Jennifer D.

    2011-06-01T23:59:59.000Z

    This document is an supplement to the 'Secure and Efficient Routable Control Systems.' It addressed security in routable control system communication. The control system environment that monitors and manages the power grid historically has utilized serial communication mechanisms. Leased-line serial communication environments operating at 1200 to 9600 baud rates are common. However, recent trends show that communication media such as fiber, optical carrier 3 (OC-3) speeds, mesh-based high-speed wireless, and the Internet are becoming the media of choice. In addition, a dichotomy has developed between the electrical transmission and distribution environments, with more modern communication infrastructures deployed by transmission utilities. The preceding diagram represents a typical control system. The Communication Links cloud supports all of the communication mechanisms a utility might deploy between the control center and devices in the field. Current methodologies used for security implementations are primarily led by single vendors or standards bodies. However, these entities tend to focus on individual protocols. The result is an environment that contains a mixture of security solutions that may only address some communication protocols at an increasing operational burden for the utility. A single approach is needed that meets operational requirements, is simple to operate, and provides the necessary level of security for all control system communication. The solution should be application independent (e.g., Distributed Network Protocol/Internet Protocol [DNP/IP], International Electrotechnical Commission [IEC] C37.118, Object Linking and Embedding for Process Control [OPC], etc.) and focus on the transport layer. In an ideal setting, a well-designed suite of standards for control system communication will be used for vendor implementation and compliance testing. An expected outcome of this effort is an international standard.

  14. Security Controls for Unclassified Information Systems Manual

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2009-01-05T23:59:59.000Z

    The Manual establishes minimum implementation standards for cyber security technical, management, and operational controls that will be followed in all information systems operated by DOE and the information systems. Admin Chg 1 dated 9-1-09. Canceled by DOE O 205.1B.

  15. Security Controls for Unclassified Information Systems Manual

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2009-01-05T23:59:59.000Z

    The Manual establishes minimum implementation standards for cyber security technical, management, and operational controls that will be followed in all information systems operated by DOE and the information systems. Admin Chg 1 dated 9-1-09; Admin Chg 2 dated 12-22-09. Canceled by DOE O 205.1B.

  16. Security Controls for Unclassified Information Systems Manual

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    2009-01-05T23:59:59.000Z

    The Manual establishes minimum implementation standards for cyber security technical, management, and operational controls that will be followed in all information systems operated by DOE and the information systems. Does not cancel other directives. Canceled by DOE O 205.1B

  17. THE DISTRIBUTED SPACECRAFT ATTITUDE CONTROL SYSTEM SIMULATOR

    E-Print Network [OSTI]

    Hall, Christopher D.

    compensation of an under-actuated system and coupled attitude control and energy storage techniques. Formation. INTRODUCTION Complex space systems are often both high-visibility and high-risk. However, programs that might@vt.edu 1 #12;custom hardware and software we have developed. The body of the paper presents information

  18. NSTX-U Control System Upgrades

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Erickson, K G; Gates, D A; Gerhardt, S P; Lawson, J E; Mozulay, R; Sichta, P; Tchilinguirian, G J

    2014-06-01T23:59:59.000Z

    The National Spherical Tokamak Experiment (NSTX) is undergoing a wealth of upgrades (NSTX-U). These upgrades, especially including an elongated pulse length, require broad changes to the control system that has served NSTX well. A new fiber serial Front Panel Data Port input and output (I/O) stream will supersede the aging copper parallel version. Driver support for the new I/O and cyber security concerns require updating the operating system from Redhat Enterprise Linux (RHEL) v4 to RedHawk (based on RHEL) v6. While the basic control system continues to use the General Atomics Plasma Control System (GA PCS), the effort to forward port the entire software package to run under 64-bit Linux instead of 32-bit Linux included PCS modifications subsequently shared with GA and other PCS users. Software updates focused on three key areas: (1) code modernization through coding standards (C99/C11), (2) code portability and maintainability through use of the GA PCS code generator, and (3) support of 64-bit platforms. Central to the control system upgrade is the use of a complete real time (RT) Linux platform provided by Concurrent Computer Corporation, consisting of a computer (iHawk), an operating system and drivers (RedHawk), and RT tools (NightStar). Strong vendor support coupled with an extensive RT toolset influenced this decision. The new real-time Linux platform, I/O, and software engineering will foster enhanced capability and performance for NSTX-U plasma control.

  19. Fermilab accelerator control system: Analog monitoring facilities

    SciTech Connect (OSTI)

    Seino, K.; Anderson, L.; Smedinghoff, J.

    1987-10-01T23:59:59.000Z

    Thousands of analog signals are monitored in different areas of the Fermilab accelerator complex. For general purposes, analog signals are sent over coaxial or twinaxial cables with varying lengths, collected at fan-in boxes and digitized with 12 bit multiplexed ADCs. For higher resolution requirements, analog signals are digitized at sources and are serially sent to the control system. This paper surveys ADC subsystems that are used with the accelerator control systems and discusses practical problems and solutions, and it describes how analog data are presented on the console system.

  20. Waste receiving and processing plant control system; system design description

    SciTech Connect (OSTI)

    LANE, M.P.

    1999-02-24T23:59:59.000Z

    The Plant Control System (PCS) is a heterogeneous computer system composed of numerous sub-systems. The PCS represents every major computer system that is used to support operation of the Waste Receiving and Processing (WRAP) facility. This document, the System Design Description (PCS SDD), includes several chapters and appendices. Each chapter is devoted to a separate PCS sub-system. Typically, each chapter includes an overview description of the system, a list of associated documents related to operation of that system, and a detailed description of relevant system features. Each appendice provides configuration information for selected PCS sub-systems. The appendices are designed as separate sections to assist in maintaining this document due to frequent changes in system configurations. This document is intended to serve as the primary reference for configuration of PCS computer systems. The use of this document is further described in the WRAP System Configuration Management Plan, WMH-350, Section 4.1.

  1. System identification for robust control design

    SciTech Connect (OSTI)

    Dohner, J.L.

    1995-04-01T23:59:59.000Z

    System identification for the purpose of robust control design involves estimating a nominal model of a physical system and the uncertainty bounds of that nominal model via the use of experimentally measured input/output data. Although many algorithms have been developed to identify nominal models, little effort has been directed towards identifying uncertainty bounds. Therefore, in this document, a discussion of both nominal model identification and bounded output multiplicative uncertainty identification will be presented. This document is divided into several sections. Background information relevant to system identification and control design will be presented. A derivation of eigensystem realization type algorithms will be presented. An algorithm will be developed for calculating the maximum singular value of output multiplicative uncertainty from measured data. An application will be given involving the identification of a complex system with aliased dynamics, feedback control, and exogenous noise disturbances. And, finally, a short discussion of results will be presented.

  2. Stable Controller Interpolation and Controller Switching for LPV Systems

    E-Print Network [OSTI]

    Rasmussen, Bryan; Chang, Young Joon

    o tr s th uar od ara y e r terp tee hed mul con 00 1 t f i l c i p a p m g s “ t l l s troller designs at specified operating conditions. This approach utilizes an approach based on the Youla parametrization #1;3#2;. For polytopic systems... matrix inequalities #3;LMIs#4; #1;4#2;. This ffort differs distinctly from existing LPV control design tech- iques, with a focus on interpolation between several fixed linear ontrollers, rather than on synthesis of a single LPV controller. he unique...

  3. Building HVAC Control System Interaction Issues: Two Case Studies

    E-Print Network [OSTI]

    Chen, Q.; Deng, S.; Toole, C.; Xu, C.

    2007-01-01T23:59:59.000Z

    Direct Digital Control (DDC) allows HVAC equipment to be controlled at an upper level (supervisory control) through commands from a central system, or at a lower-level (local-loop control) by local controllers. The various levels of equipment...

  4. System Optimization - The Global Approach to HVAC Control

    E-Print Network [OSTI]

    Thielman, D. E.

    1984-01-01T23:59:59.000Z

    System Optimization is a new approach to HVAC control as implemented by Energy Management Control Systems. System Optimization is defined as electronic building control strategies which treat a building's HVAC components as a complete energy...

  5. Output Feedback Control and Optimal Bandwidth Allocation of Networked Control Systems

    E-Print Network [OSTI]

    Dong, Jiawei

    2013-04-12T23:59:59.000Z

    A networked control system (NCS) is a control system where sensors, actuators, and controllers are interconnected over a communication network. This dissertation presents a framework for modeling, stability analysis, optimal control, and bandwidth...

  6. Control system for a vertical axis windmill

    DOE Patents [OSTI]

    Brulle, Robert V. (St. Louis County, MO)

    1983-10-18T23:59:59.000Z

    A vertical axis windmill having a rotating structure is provided with a series of articulated vertical blades whose positions are controlled to maintain a constant RPM for the rotating structure, when wind speed is sufficient. A microprocessor controller is used to process information on wind speed, wind direction and RPM of the rotating structure to develop an electrical signal for establishing blade position. The preferred embodiment of the invention, when connected to a utility grid, is designed to generate 40 kilowatts of power when exposed to a 20 mile per hour wind. The control system for the windmill includes electrical blade actuators that modulate the blades of the rotating structure. Blade modulation controls the blade angle of attack, which in turn controls the RPM of the rotor. In the preferred embodiment, the microprocessor controller provides the operation logic and control functions. A wind speed sensor provides inputs to start or stop the windmill, and a wind direction sensor is used to keep the blade flip region at 90.degree. and 270.degree. to the wind. The control system is designed to maintain constant rotor RPM when wind speed is between 10 and 40 miles per hour.

  7. A Systems Integration Approach To Lighting Control Systems

    E-Print Network [OSTI]

    Lynch, S.; Renner, R. A.

    2000-01-01T23:59:59.000Z

    Today, the lighting industry is experiencing renewed development and implementation of advanced technologies. One of the most striking advances is the implementation of system solutions in lighting control. This approach promises to contribute...

  8. ForPeerReview SMC Framework in Motion Control Systems

    E-Print Network [OSTI]

    Yanikoglu, Berrin

    , Interconnected Systems. 1. INTRODUCTION Modern motion control systems are more and more acting as "agentsForPeerReview SMC Framework in Motion Control Systems Journal: International Journal of Adaptive, Mechatronics Keywords: Motion Control, Sliding Mode Control, Bilateral Control , Interconnected Systems http

  9. Open Source Ch Control System Toolkit and Web-Based

    E-Print Network [OSTI]

    Cheng, Harry H.

    Open Source Ch Control System Toolkit and Web-Based Control System Design for Teaching Automatic, and WCCDM for teaching automatic control of linear time-invariant systems is presented. With the CCST.20454 Keywords: control systems; Web-based education INTRODUCTION Automatic control has become a major

  10. An Integrated System Simulation Approach for Wireless Networked Control Systems

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    Vanderbilt University Nashville, TN, USA Abstract--Cyber-Physical Systems (CPS), such as networked control wireless networks. Accurate modeling of these communication networks is essential in the design and verification of CPS. Controller design needs to take into ac- count the wireless channel characteristics (e

  11. From Basic Control to Optimized Systems-Applying Digital Control Systems to Steam Boilers 

    E-Print Network [OSTI]

    Hockenbury, W. D.

    1982-01-01T23:59:59.000Z

    on heat transferred to a process. If that process suffers an upset, unstable conditions can propagate from one process to another via the steam supply system. The closer the tolerance in the boiler control system, the smaller the steam header...

  12. DOES DAYLIGHT SAVING TIME SAVE ENERGY? EVIDENCE FROM A NATURAL EXPERIMENT IN INDIANA

    E-Print Network [OSTI]

    Kotchen, Matthew J.

    electricity bills. We also estimate social costs of increased pollution emissions between $1.7 to $5.5 million implemented a DST policy, with the aim of reducing demand for electrical lighting to free up more coal to estimate the effect of daylight saving time (DST) on residential electricity consumption. Our main finding

  13. Actively controlled vibration welding system and method

    DOE Patents [OSTI]

    Cai, Wayne W.; Kang, Bongsu; Tan, Chin-An

    2013-04-02T23:59:59.000Z

    A vibration welding system includes a controller, welding horn, an active material element, and anvil assembly. The assembly may include an anvil body connected to a back plate and support member. The element, e.g., a piezoelectric stack or shape memory alloy, is positioned with respect to the assembly. The horn vibrates in a desirable first direction to form a weld on a work piece. The element controls any vibrations in a second direction by applying calibrated response to the anvil body in the second direction. A method for controlling undesirable vibrations in the system includes positioning the element with respect to the anvil assembly, connecting the anvil body to the support member through the back plate, vibrating the horn in a desirable first direction, and transmitting an input signal to the element to control vibration in an undesirable second direction.

  14. Anticipative and non-anticipative controller design for network control systems

    E-Print Network [OSTI]

    Naghshtabrizi, P; Hespanha, Joao P

    2006-01-01T23:59:59.000Z

    time-delay systems. IEEE Trans.on Automatic Control, 47(2):time-delay systems. IEEE Trans.on Automatic Control, 47(11),Control Systems with Delays. PhD thesis, Depart- ment of Automatic

  15. A Summary of Control System Security Standards Activities in...

    Energy Savers [EERE]

    A Summary of Control System Security Standards Activities in the Energy Sector (October 2005) A Summary of Control System Security Standards Activities in the Energy Sector...

  16. Control Systems Security News Archive | Department of Energy

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

    News Archive Control Systems Security News Archive Control Systems Security News Archive September 2010 - Secretary Chu Announces Latest Efforts to Address Cybersecurity August...

  17. Reference Model for Control and Automation Systems in Electrical...

    Office of Environmental Management (EM)

    Model for Control and Automation Systems in Electrical Power (October 2005) Reference Model for Control and Automation Systems in Electrical Power (October 2005) Modern...

  18. TOP 10 VULNERABILITIES OF CONTROL SYSTEMS AND THEIR ASSOCIATED...

    Energy Savers [EERE]

    TOP 10 VULNERABILITIES OF CONTROL SYSTEMS AND THEIR ASSOCIATED MITIGATIONS TOP 10 VULNERABILITIES OF CONTROL SYSTEMS AND THEIR ASSOCIATED MITIGATIONS This document provides...

  19. "Supervisory Control and Data Acquisition (SCADA) Systems." The...

    Energy Savers [EERE]

    "Supervisory Control and Data Acquisition (SCADA) Systems." The CIP Report. Vol 7 No 8 "Supervisory Control and Data Acquisition (SCADA) Systems." The CIP Report. Vol 7 No 8...

  20. National SCADA Test Bed - Enhancing control systems security...

    Energy Savers [EERE]

    SCADA Test Bed - Enhancing control systems security in the energy sector (September 2009) National SCADA Test Bed - Enhancing control systems security in the energy sector...

  1. Activities to Secure Control Systems in the Energy Sector | Department...

    Office of Environmental Management (EM)

    Activities to Secure Control Systems in the Energy Sector Activities to Secure Control Systems in the Energy Sector Presentation-given at the Federal Utility Partnership Working...

  2. Common Cyber Security Vulnerabilities Observed in Control System...

    Energy Savers [EERE]

    Common Cyber Security Vulnerabilities Observed in Control System Assessments by the INL NSTB Program Common Cyber Security Vulnerabilities Observed in Control System Assessments by...

  3. T-592: Cisco Security Advisory: Cisco Secure Access Control System...

    Energy Savers [EERE]

    92: Cisco Security Advisory: Cisco Secure Access Control System Unauthorized Password Change Vulnerability T-592: Cisco Security Advisory: Cisco Secure Access Control System...

  4. Top 10 Vulnerabilities of Control Systems and Their Associated...

    Energy Savers [EERE]

    Top 10 Vulnerabilities of Control Systems and Their Associated Migitations (2006) Top 10 Vulnerabilities of Control Systems and Their Associated Migitations (2006) This document...

  5. Small- and Medium-Size Building Automation and Control System...

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

    Small- and Medium-Size Building Automation and Control System Needs: Scoping Study Small- and Medium-Size Building Automation and Control System Needs: Scoping Study Emerging...

  6. Advanced LD Engine Systems and Emissions Control Modeling and...

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

    LD Engine Systems and Emissions Control Modeling and Analysis Advanced LD Engine Systems and Emissions Control Modeling and Analysis 2012 DOE Hydrogen and Fuel Cells Program and...

  7. advanced control systems: Topics by E-print Network

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

    Systems and Controls Laboratory Engineering Websites Summary: at high penetration rates Battery Energy Storage Systems A BESS consists of a battery bank, a control 80% loss...

  8. advanced control system: Topics by E-print Network

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

    Systems and Controls Laboratory Engineering Websites Summary: at high penetration rates Battery Energy Storage Systems A BESS consists of a battery bank, a control 80% loss...

  9. Simplification of Diesel Emission Control System Packaging Using...

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

    Simplification of Diesel Emission Control System Packaging Using SCR Coated on DPF Simplification of Diesel Emission Control System Packaging Using SCR Coated on DPF Study...

  10. Experimental Studies for DPF and SCR Model, Control System, and...

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

    DPF and SCR Model, Control System, and OBD Development for Engines Using Diesel and Biodiesel Fuels Experimental Studies for DPF and SCR Model, Control System, and OBD...

  11. Advanced PHEV Engine Systems and Emissions Control Modeling and...

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

    PHEV Engine Systems and Emissions Control Modeling and Analysis Advanced PHEV Engine Systems and Emissions Control Modeling and Analysis 2011 DOE Hydrogen and Fuel Cells Program,...

  12. Advanced HD Engine Systems and Emissions Control Modeling and...

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

    HD Engine Systems and Emissions Control Modeling and Analysis Advanced HD Engine Systems and Emissions Control Modeling and Analysis 2012 DOE Hydrogen and Fuel Cells Program and...

  13. D i i f S t i bilit i th B ilt E i tDesigning for Sustainability in the Built Environment Exterior Facade Design for Maximum Daylighting and Solar Power

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    Facade Design for Maximum Daylighting and Solar Power GenerationGeneration A frank assessment of issues "...the art and science of daylighting is not so much about how to provide enough daylighting as how to do LIGHTING CHARACTER DUE TO DAYLIGHT VARIABILITY · PSYCHOLOGICAL BENEFITS OF· PSYCHOLOGICAL BENEFITS

  14. Reactor control rod timing system. [LMFBR

    DOE Patents [OSTI]

    Wu, P.T.K.

    1980-03-18T23:59:59.000Z

    A fluid driven jet-edge whistle timing system is described for control rods of a nuclear reactor for producing real-time detection of the timing of each control rod in its scram operation. An important parameter in reactor safety, particularly for liquid metal fast breeder reactors (LMFBR), is the time deviation between the time the control rod is released and the time the rod actually reaches the down position. The whistle has a nearly pure tone signal with center frequency (above 100 kHz) far above the frequency band in which the energy of the background noise is concentrated. Each control rod can be fitted with a whistle with a different frequency so that there is no ambiguity in differentiating the signal from each control rod.

  15. Timing system control software in the SLC

    SciTech Connect (OSTI)

    Thompson, K.; Phinney, N.

    1985-04-01T23:59:59.000Z

    A new timing system that allows precision (approx.1 to 2 ns) control of the trigger times of klystrons, beam position monitors, and other devices on a pulse-to-pulse basis at up to 360 Hz is in operation in the first third of the SLAC linear accelerator. The control software is divided between a central host VAX and local Intel 8086-based microprocessor clusters. Facilities exist to set up and adjust the timing of devices or groups of devices independently for beam pulses having different destinations and purposes, which are run in an interlaced fashion during normal machine operation. Upgrading of the system is currently underway, using a new version of the Programmable Delay Unit CAMAC module to allow pipelining of timing information for three machine pulses. An overview of the current state of the system is presented in this paper, with an emphasis on software control.

  16. CDC-INV4104 Optimal Control of A ne Connection Control Systems: A

    E-Print Network [OSTI]

    Murray, Richard M.

    CDC-INV4104 Optimal Control of A ne Connection Control Systems: A Variational Approach J. Alexander we investigate the optimal control of a ne connection control systems. The formalism of the a ne-dimensional second-order system as a 2n-dimensional rst-order system and applying the machinery of optimal control

  17. Variable temperature seat climate control system

    DOE Patents [OSTI]

    Karunasiri, Tissa R. (Van Nuys, CA); Gallup, David F. (Pasadena, CA); Noles, David R. (Glendale, CA); Gregory, Christian T. (Alhambra, CA)

    1997-05-06T23:59:59.000Z

    A temperature climate control system comprises a variable temperature seat, at least one heat pump, at least one heat pump temperature sensor, and a controller. Each heat pump comprises a number of Peltier thermoelectric modules for temperature conditioning the air in a main heat exchanger and a main exchanger fan for passing the conditioned air from the main exchanger to the variable temperature seat. The Peltier modules and each main fan may be manually adjusted via a control switch or a control signal. Additionally, the temperature climate control system may comprise a number of additional temperature sensors to monitor the temperature of the ambient air surrounding the occupant as well as the temperature of the conditioned air directed to the occupant. The controller is configured to automatically regulate the operation of the Peltier modules and/or each main fan according to a temperature climate control logic designed both to maximize occupant comfort during normal operation, and minimize possible equipment damage, occupant discomfort, or occupant injury in the event of a heat pump malfunction.

  18. Development of computer controls for a goniophotometer

    E-Print Network [OSTI]

    Burgos, Javier (Javier F.)

    2008-01-01T23:59:59.000Z

    The investigation of innovative window materials for redirecting light and thermal sources is an important component of the field of daylighting. The Heliodome system developed in the Building Technology department is a ...

  19. INTEGRATED CONTROL OF NEXT GENERATION POWER SYSTEM

    SciTech Connect (OSTI)

    None

    2010-02-28T23:59:59.000Z

    Control methodologies provide the necessary data acquisition, analysis and corrective actions needed to maintain the state of an electric power system within acceptable operating limits. These methods are primarily software-based algorithms that are nonfunctional unless properly integrated with system data and the appropriate control devices. Components of the control of power systems today include protective relays, supervisory control and data acquisition (SCADA), distribution automation (DA), feeder automation, software agents, sensors, control devices and communications. Necessary corrective actions are still accomplished using large electromechanical devices such as vacuum, oil and gas-insulated breakers, capacitor banks, regulators, transformer tap changers, reclosers, generators, and more recently FACTS (flexible AC transmission system) devices. The recent evolution of multi-agent system (MAS) technologies has been reviewed and effort made to integrate MAS into next generation power systems. A MAS can be defined as ��a loosely-coupled network of problem solvers that work together to solve problems that are beyond their individual capabilities��. These problem solvers, often called agents, are autonomous and may be heterogeneous in nature. This project has shown that a MAS has significant advantages over a single, monolithic, centralized problem solver for next generation power systems. Various communication media are being used in the electric power system today, including copper, optical fiber and power line carrier (PLC) as well as wireless technologies. These technologies have enabled the deployment of substation automation (SA) at many facilities. Recently, carrier and wireless technologies have been developed and demonstrated on a pilot basis. Hence, efforts have been made by this project to penetrate these communication technologies as an infrastructure for next generation power systems. This project has thus pursued efforts to use specific MAS methods as well as pertinent communications protocols to imbed and assess such technologies in a real electric power distribution system, specifically the Circuit of the Future (CoF) developed by Southern California Edison (SCE). By modeling the behavior and communication for the components of a MAS, the operation and control of the power distribution circuit have been enhanced. The use of MAS to model and integrate a power distribution circuit offers a significantly different approach to the design of next generation power systems. For example, ways to control a power distribution circuit that includes a micro-grid while considering the impacts of thermal constraints, and integrating voltage control and renewable energy sources on the main power system have been pursued. Both computer simulations and laboratory testbeds have been used to demonstrate such technologies in electric power distribution systems. An economic assessment of MAS in electric power systems was also performed during this project. A report on the economic feasibility of MAS for electric power systems was prepared, and particularly discusses the feasibility of incorporating MAS in transmission and distribution (T&D) systems. Also, the commercial viability of deploying MAS in T&D systems has been assessed by developing an initial case study using utility input to estimate the benefits of deploying MAS. In summary, the MAS approach, which had previously been investigated with good success by APERC for naval shipboard applications, has now been applied with promising results for enhancing an electric power distribution circuit, such as the Circuit of the Future developed by Southern California Edison. The results for next generation power systems include better ability to reconfigure circuits, improve protection and enhance reliability.

  20. Control of pore size in epoxy systems.

    SciTech Connect (OSTI)

    Sawyer, Patricia Sue; Lenhart, Joseph Ludlow (North Dakota State University, Fargo, ND); Lee, Elizabeth (North Dakota State University, Fargo, ND); Kallam, Alekhya (North Dakota State University, Fargo, ND); Majumdar, Partha (North Dakota State University, Fargo, ND); Dirk, Shawn M.; Gubbins, Nathan; Chisholm, Bret J. (North Dakota State University, Fargo, ND); Celina, Mathias Christopher; Bahr, James (North Dakota State University, Fargo, ND); Klein, Robert J.

    2009-01-01T23:59:59.000Z

    Both conventional and combinatorial approaches were used to study the pore formation process in epoxy based polymer systems. Sandia National Laboratories conducted the initial work and collaborated with North Dakota State University (NDSU) using a combinatorial research approach to produce a library of novel monomers and crosslinkers capable of forming porous polymers. The library was screened to determine the physical factors that control porosity, such as porogen loading, polymer-porogen interactions, and polymer crosslink density. We have identified the physical and chemical factors that control the average porosity, pore size, and pore size distribution within epoxy based systems.

  1. Secure and Efficient Routable Control Systems

    SciTech Connect (OSTI)

    Edgar, Thomas W.; Hadley, Mark D.; Manz, David O.; Winn, Jennifer D.

    2010-05-01T23:59:59.000Z

    This document provides the methods to secure routable control system communication in the electric sector. The approach of this document yields a long-term vision for a future of secure communication, while also providing near term steps and a roadmap. The requirements for the future secure control system environment were spelled out to provide a final target. Additionally a survey and evaluation of current protocols was used to determine if any existing technology could achieve this goal. In the end a four-step path was described that brought about increasing requirement completion and culminates in the realization of the long term vision.

  2. The SLC control system - status and development

    SciTech Connect (OSTI)

    Phinney, N.; Shoaee, H.

    1987-03-01T23:59:59.000Z

    The SLC control system is installed and operational in the full SLC through the Linac, Damping Rings, Positron Source, Arcs and Final Focus. The system now includes a host VAX 11/785, a development VAX 11/780, 4 VAX workstations, a distributed network of 70 microprocessors, and about 270 Camac crates with more than 4000 modules. The micros are used for control and monitoring of the hardware, for pulse-to-pulse feedback, and for consoles (COWs). High level model-driven host software provides a variety of tools for beam setup, optimization, diagnosis, and stabilization. This paper will summarize the current status and projects under development.

  3. Evolution of the racetrack microtron control system

    SciTech Connect (OSTI)

    Martin, E.R.; Schneider, C.M.; Martinez, V.A.; Trout, R.E.; Gritzo, R.E.

    1981-01-01T23:59:59.000Z

    Ultimately, the true measure of a control system lies in how well initial decisions allow for exigencies, as the overall machine evolves and requirements solidify. Recognizing that advances in electronic technology virtually guarantee that any system will be technologically out of date by the time it is operational, the criteria really do not involve the state of the technological advancement, but instead legitimately ask whether the control-system design can adjust to the inevitable machine-design changes, whether the operators can use it to control the machine in a reasonable manner, whether it was built within budget constraints, or - in short - whether it works. On these bases, our initial decisions on the racetrack microtron (RTM) control system have been increasingly vindicated as the system has evolved, and we feel that our experiences have shed some light on just which criteria are of real importance, and which are merely a part of the lore of popular misinformation. Unless the basic requirements are met, technical elegance is no virtue, and when they are met, design simplicity is no vice.

  4. Dynamical Analysis of a Networked Control System

    E-Print Network [OSTI]

    Guofeng Zhang; Guanrong Chen; Tongwen Chen; Maria D'Amico

    2014-05-18T23:59:59.000Z

    A new network data transmission strategy was proposed in Zhang \\& Chen [2005] (arXiv:1405.2404), where the resulting nonlinear system was analyzed and the effectiveness of the transmission strategy was demonstrated via simulations. In this paper, we further generalize the results of Zhang \\& Chen [2005] in the following ways: 1) Construct first-return maps of the nonlinear systems formulated in Zhang \\& Chen [2005] and derive several existence conditions of periodic orbits and study their properties. 2) Formulate the new system as a hybrid system, which will ease the succeeding analysis. 3) Prove that this type of hybrid systems is not structurally stable based on phase transition which can be applied to higher-dimensional cases effortlessly. 4) Simulate a higher-dimensional model with emphasis on their rich dynamics. 5) Study a class of continuous-time hybrid systems as the counterparts of the discrete-time systems discussed above. 6) Propose new controller design methods based on this network data transmission strategy to improve the performance of each individual system and the whole network. We hope that this research and the problems posed here will rouse interests of researchers in such fields as control, dynamical systems and numerical analysis.

  5. NSTX-U Control System Upgrades

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Erickson, K. G.; Gates, D. A.; Gerhardt, S. P.; Lawson, J. E.; Mozulay, R.; Sichta, P.; Tchilinguirian, G. J.

    2014-06-01T23:59:59.000Z

    The National Spherical Tokamak Experiment (NSTX) is undergoing a wealth of upgrades (NSTX-U). These upgrades, especially including an elongated pulse length, require broad changes to the control system that has served NSTX well. A new fiber serial Front Panel Data Port input and output (I/O) stream will supersede the aging copper parallel version. Driver support for the new I/O and cyber security concerns require updating the operating system from Redhat Enterprise Linux (RHEL) v4 to RedHawk (based on RHEL) v6. While the basic control system continues to use the General Atomics Plasma Control System (GA PCS), the effort to forwardmore »port the entire software package to run under 64-bit Linux instead of 32-bit Linux included PCS modifications subsequently shared with GA and other PCS users. Software updates focused on three key areas: (1) code modernization through coding standards (C99/C11), (2) code portability and maintainability through use of the GA PCS code generator, and (3) support of 64-bit platforms. Central to the control system upgrade is the use of a complete real time (RT) Linux platform provided by Concurrent Computer Corporation, consisting of a computer (iHawk), an operating system and drivers (RedHawk), and RT tools (NightStar). Strong vendor support coupled with an extensive RT toolset influenced this decision. The new real-time Linux platform, I/O, and software engineering will foster enhanced capability and performance for NSTX-U plasma control.« less

  6. A Meta-Analysis of Energy Savings from Lighting Controls in Commercial Buildings

    E-Print Network [OSTI]

    Williams, Alison

    2012-01-01T23:59:59.000Z

    daylighting control for low energy buildings. Proceedings ofAIVC Conference on Building Low Energy Cooling and Advancedlow, federal energy conservation standards do not include lighting controls, and state and local building

  7. Optimal control of interacting particle systems Charles Bordenave

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Optimal control of interacting particle systems Charles Bordenave CNRS & Universit´e de Toulouse are in interaction and a central controller may aim at optimizing a performance measure of the system via a control the symmetry breaking phenomena for optimal control strategies. 2 Controlled particle systems 2.1 Model

  8. Variable emissivity laser thermal control system

    DOE Patents [OSTI]

    Milner, J.R.

    1994-10-25T23:59:59.000Z

    A laser thermal control system for a metal vapor laser maintains the wall temperature of the laser at a desired level by changing the effective emissivity of the water cooling jacket. This capability increases the overall efficiency of the laser. 8 figs.

  9. Oscillation control system for electric motor drive

    DOE Patents [OSTI]

    Slicker, J.M.; Sereshteh, A.

    1988-08-30T23:59:59.000Z

    A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify the torque commands applied to the motor. 5 figs.

  10. Distributed Power Control in Wireless Communication Systems

    E-Print Network [OSTI]

    Chronopoulos, Anthony T.

    Distributed Power Control in Wireless Communication Systems S. Jagannathan A. T. Chronopoulos, S layered structure in that we jointly address the issue of transmitted power levels in point to point commu the transmitter power at a given node increases not only the operating life of the bat- tery but also the overall

  11. Method and system for controlled combustion engines

    DOE Patents [OSTI]

    Oppenheim, A. K. (Berkeley, CA)

    1990-01-01T23:59:59.000Z

    A system for controlling combustion in internal combustion engines of both the Diesel or Otto type, which relies on establishing fluid dynamic conditions and structures wherein fuel and air are entrained, mixed and caused to be ignited in the interior of a multiplicity of eddies, and where these structures are caused to sequentially fill the headspace of the cylinders.

  12. Oscillation control system for electric motor drive

    DOE Patents [OSTI]

    Slicker, James M. (Union Lake, MI); Sereshteh, Ahmad (Union Lake, MI)

    1988-01-01T23:59:59.000Z

    A feedback system for controlling mechanical oscillations in the torsionally complaint drive train of an electric or other vehicle. Motor speed is converted in a processor to estimate state signals in which a plant model which are used to electronically modify thetorque commands applied to the motor.

  13. Distributed Timing and Triggering Control System

    SciTech Connect (OSTI)

    Bowen, T., Huerta, J. A.

    2012-08-01T23:59:59.000Z

    This document is a slide show type presentation regarding the need and realization of a new control system for work at the Nevada National Security Site. Commercial products that met the need are identified, both hardware and software. Particular emphasis is on the Integrated Signal Programmer.

  14. 16.31 Feedback Control Systems, Fall 2001

    E-Print Network [OSTI]

    How, Jonathan P.

    Introduction to the state-space approach to control system analysis and control synthesis. State-space representation of dynamic systems; controllability and observability; state-space realizations of transfer functions; ...

  15. Challenges in Future Automobile Control Systems with Multicore Processors

    E-Print Network [OSTI]

    Rajkumar, Ragunathan "Raj"

    Challenges in Future Automobile Control Systems with Multicore Processors Dakai Zhu and Chunjiang. Therefore, the number of electronic control units (ECUs) in modern vehicles has continuously increased, which further increases the design complexity of automotive control systems. Multicore processors, where

  16. Recommended Practice for Securing Control System Modems

    SciTech Connect (OSTI)

    James R. Davidson; Jason L. Wright

    2008-01-01T23:59:59.000Z

    This paper addresses an often overlooked “backdoor” into critical infrastructure control systems created by modem connections. A modem’s connection to the public telephone system is similar to a corporate network connection to the Internet. By tracing typical attack paths into the system, this paper provides the reader with an analysis of the problem and then guides the reader through methods to evaluate existing modem security. Following the analysis, a series of methods for securing modems is provided. These methods are correlated to well-known networking security methods.

  17. Timed Relational Abstractions For Sampled Data Control Systems

    E-Print Network [OSTI]

    Sankaranarayanan, Sriram

    of a plant, modeled as a hybrid system and a synchronous controller, modeled as a discrete transition system, we consider a simple and natural model of a sampled data control system. The controller is modeledTimed Relational Abstractions For Sampled Data Control Systems Aditya Zutshi1 , Sriram

  18. Control System Architecture for a Remotely Operated Unmanned Land Vehicle

    E-Print Network [OSTI]

    developed for the control of industrial robots and automated manufacturing systems. In this application, RCS

  19. Predictive control of supply temperature in district heating systems

    E-Print Network [OSTI]

    Predictive control of supply temperature in district heating systems Torben Skov Nielsen Henrik This report considers a new concept for controlling the supply temperature in district heating systems using stochastic modelling, prediction and control. A district heating systems is a di#30;cult system to control

  20. A plasma process monitor/control system

    SciTech Connect (OSTI)

    Stevenson, J.O.; Ward, P.P.; Smith, M.L. [Sandia National Labs., Albuquerque, NM (United States); Markle, R.J. [Advanced Micro Devices, Inc., Austin, TX (United States)

    1997-08-01T23:59:59.000Z

    Sandia National Laboratories has developed a system to monitor plasma processes for control of industrial applications. The system is designed to act as a fully automated, sand-alone process monitor during printed wiring board and semiconductor production runs. The monitor routinely performs data collection, analysis, process identification, and error detection/correction without the need for human intervention. The monitor can also be used in research mode to allow process engineers to gather additional information about plasma processes. The plasma monitor can perform real-time control of support systems known to influence plasma behavior. The monitor can also signal personnel to modify plasma parameters when the system is operating outside of desired specifications and requires human assistance. A notification protocol can be selected for conditions detected in the plasma process. The Plasma Process Monitor/Control System consists of a computer running software developed by Sandia National Laboratories, a commercially available spectrophotometer equipped with a charge-coupled device camera, an input/output device, and a fiber optic cable.

  1. Recommended Practice for Patch Management of Control Systems

    SciTech Connect (OSTI)

    Steven Tom; Dale Christiansen; Dan Berrett

    2008-12-01T23:59:59.000Z

    A key component in protecting a nation’s critical infrastructure and key resources is the security of control systems. The term industrial control system refers to supervisory control and data acquisition, process control, distributed control, and any other systems that control, monitor, and manage the nation’s critical infrastructure. Critical Infrastructure and Key Resources (CIKR) consists of electric power generators, transmission systems, transportation systems, dam and water systems, communication systems, chemical and petroleum systems, and other critical systems that cannot tolerate sudden interruptions in service. Simply stated, a control system gathers information and then performs a function based on its established parameters and the information it receives. The patch management of industrial control systems software used in CIKR is inconsistent at best and nonexistent at worst. Patches are important to resolve security vulnerabilities and functional issues. This report recommends patch management practices for consideration and deployment by industrial control systems owners.

  2. Optimal Control Using an Algebraic Method for Control-Affine Nonlinear Systems

    E-Print Network [OSTI]

    Won, Chang-Hee

    of researchers have worked on the nonlinear optimal control problem, but they usually assume a linear systemOptimal Control Using an Algebraic Method for Control-Affine Nonlinear Systems Chang-Hee Won, 2007 Abstract A deterministic optimal control problem is solved for a control-affine nonlin- ear system

  3. Distributed PI-Control with Applications to Power Systems Frequency Control

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    Distributed PI-Control with Applications to Power Systems Frequency Control Martin Andreasson12 to frequency control of power transmission systems. Sufficient stability criteria are derived, and it is shown. For systems where constant disturbances or model errors are present, PI-control is a commonly used control

  4. Virtual control system environment: A modeling and simulation tool for process control systems

    SciTech Connect (OSTI)

    Lee, E.; Michalski, J.; Sholander, P.; Van Leeuwen, B. [Sandia National Laboratories, Albuquerque, NM 87111 (United States)

    2006-07-01T23:59:59.000Z

    The development of tools and techniques for security testing and performance testing of Process Control Systems (PCS) is needed since those systems are vulnerable to the same classes of threats as other networked computer systems. In practice, security testing is difficult to perform on operational PCS because it introduces an unacceptable risk of disruption to the critical systems (e.g., power grids) that they control. In addition, the hardware used in PCS is often expensive, making full-scale mockup systems for live experiments impractical. A more flexible approach to these problems can be provided through test beds that provide the proper mix of real, emulated, and virtual elements to model large, complex systems such as critical infrastructures. This paper describes a 'Virtual Control System Environment' that addresses these issues. (authors)

  5. Management of Control System Information SecurityI: Control System Patch Management

    SciTech Connect (OSTI)

    Quanyan Zhu; Miles McQueen; Craig Rieger; Tamer Basar

    2011-09-01T23:59:59.000Z

    The use of information technologies in control systems poses additional potential threats due to the frequent disclosure of software vulnerabilities. The management of information security involves a series of policy-making on the vulnerability discovery, disclosure, patch development and patching. In this paper, we use a system approach to devise a model to understand the interdependencies of these decision processes. In more details, we establish a theoretical framework for making patching decision for control systems, taking into account the requirement of functionability of control systems. We illustrate our results with numerical simulations and show that the optimal operation period of control systems given the currently estimated attack rate is roughly around a half a month.

  6. TREAT Upgrade Manual Reactor Control System and its interface with the Automatic Reactor Control System and the Plant Protection System

    SciTech Connect (OSTI)

    McDowell, W.P.

    1985-01-01T23:59:59.000Z

    The Transient Reactor Test Facility (TREAT) at Argonne National Laboratory is being upgraded to simulate extreme conditions in a reactor. This facility will be used to subject test assemblies of fuel bundles to very rapid and intense power transients. This paper will describe in detail the manual reactor control system and its interfaces with the plant protection system the automatic reactor control system.

  7. On modeling and controlling intelligent systems

    SciTech Connect (OSTI)

    Dress, W.B.

    1993-11-01T23:59:59.000Z

    The aim of this paper is to show how certain diverse and advanced techniques of information processing and system theory might be integrated into a model of an intelligent, complex entity capable of materially enhancing an advanced information management system. To this end, we first examine the notion of intelligence and ask whether a semblance thereof can arise in a system consisting of ensembles of finite-state automata. Our goal is to find a functional model of intelligence in an information-management setting that can be used as a tool. The purpose of this tool is to allow us to create systems of increasing complexity and utility, eventually reaching the goal of an intelligent information management system that provides and anticipates needed data and information. We base our attempt on the ideas of general system theory where the four topics of system identification, modeling, optimization, and control provide the theoretical framework for constructing a complex system that will be capable of interacting with complex systems in the real world. These four key topics are discussed within the purview of cellular automata, neural networks, and evolutionary programming. This is a report of ongoing work, and not yet a success story of a synthetic intelligent system.

  8. Space, light, and time : prospective analysis of Circadian illumination for health-based daylighting with applications to healthcare architecture

    E-Print Network [OSTI]

    Pechacek, Christopher S. (Christopher Scott)

    2008-01-01T23:59:59.000Z

    Light in architecture can be studied for its objective or perceptual effects. This thesis describes an objective link between human health and architectural design. Specifically, the link between daylight and human circadian ...

  9. HVDC system control for damping subsynchronous oscillations

    SciTech Connect (OSTI)

    Piwko, R.J.; Larsen, E.V.

    1982-07-01T23:59:59.000Z

    A method for designing a supplemental subsynchronous damping control (SSDC) for an HVDC transmission system is described. The SSDC eliminates torsional instabilities caused by interaction between conventional HVDC controls and turbine-generator rotor torsional modes of vibration. Results of digital simulation used in the design process are compared with measurements made on an HVDC simulator. Results of both digital simulations and HVDC simulator tests which demonstrate SSDC performance are shown. This research and development effort was sponsored by EPRI under RP1425-1.

  10. Control Engineering Practice 14 (2006) 319326 Life extending control of boilerturbine systems via model

    E-Print Network [OSTI]

    Marquez, Horacio J.

    2006-01-01T23:59:59.000Z

    . All rights reserved. Keywords: Co-generation systems; Boiler control; Industrial applications; Life

  11. Systems and Control Systems and Control is an area of study within mechanical engineering that integrates the basic

    E-Print Network [OSTI]

    New Hampshire, University of

    Systems and Control Systems and Control is an area of study within mechanical engineering, into a methodology that can be used to design complex interdisciplinary systems. Examples include: position control of antenna, modeling of a train breaking system, modeling of a brushless DC motor, control of a remote

  12. The APS control system network upgrade.

    SciTech Connect (OSTI)

    Sidorowicz, K. v.; Leibfritz, D.; McDowell, W. P.

    1999-10-22T23:59:59.000Z

    When it was installed,the Advanced Photon Source (APS) control system network was at the state-of-the-art. Different aspects of the system have been reported at previous meetings [1,2]. As loads on the controls network have increased due to newer and faster workstations and front-end computers, we have found performance of the system declining and have implemented an upgraded network. There have been dramatic advances in networking hardware in the last several years. The upgraded APS controls network replaces the original FDDI backbone and shared Ethernet hubs with redundant gigabit uplinks and fully switched 10/100 Ethernet switches with backplane fabrics in excess of 20 Gbits/s (Gbps). The central collapsed backbone FDDI concentrator has been replaced with a Gigabit Ethernet switch with greater than 30 Gbps backplane fabric. Full redundancy of the system has been maintained. This paper will discuss this upgrade and include performance data and performance comparisons with the original network.

  13. Advanced Controls and Sustainable Systems for Residential Ventilation

    E-Print Network [OSTI]

    Turner, William J.N.

    2014-01-01T23:59:59.000Z

    through dynamic control of ventilation systems. Energy andcontinuous mechanical ventilation systems a mean annualcompliant ASHRAE 62.2 ventilation system. Table 12: Average

  14. Model Predictive Control for the Operation of Building Cooling Systems

    E-Print Network [OSTI]

    Ma, Yudong

    2010-01-01T23:59:59.000Z

    storage in building cooling systems. Technical report,storage in building cooling systems. Decision and Control,for the Operation of Building Cooling Systems Yudong Ma ? ,

  15. Origins of Analysis Methods Used to Design High Performance Commercial Buildings: Part III, Lighting and Daylighting Simulation

    E-Print Network [OSTI]

    Oh, S.; Haberl, J.S.

    Origins of analysis methods used to design high performance commercial buildings: Part III, Lighting and daylighting simulation Sukjoon Oh Jeff S. Haberl Student Member ASHRAE Fellow ASHRAE This study is the third part of the review... methods used in lighting and daylighting simulation programs are described. In companion papers, the origins of the analysis methods of whole-building energy and solar energy analysis programs are reviewed(Oh and Haberl 2014a, 2014b). Introduction...

  16. Distributed PI-Control with Applications to Power Systems Frequency Control

    E-Print Network [OSTI]

    Dimarogonas, Dimos

    and decentralized control. In a distributed control architecture, there is no centralized controller with global. In a decentralized control architecture however, there is no communication between the individual controllersDistributed PI-Control with Applications to Power Systems Frequency Control Martin Andreasson12

  17. Poincaré-based control of delayed measured systems: Limitations and Improved Control

    E-Print Network [OSTI]

    Jens Christian Claussen

    2007-12-27T23:59:59.000Z

    When a chaotic system is to be stabilized to a unstable orbit, delayed measurement of the system limits the applicability of chaos control techniqes. These limitations are analyzed and control schemes as linear predictive logging control (LPLC) and memory difference control (MDC) are introduced which can overcome those limitations for chaos control schemes that act in the Poincar\\'{e} section as Ott-Grebogi-Yorke (OGY) control and Bielawski-Derozier_Glorieux control (difference control).

  18. Human detection with a multi-sensors stereovision system

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Human detection with a multi-sensors stereovision system Y. Benezeth1 , P.M. Jodoin2 , B. Emile3 Far-Infrared (FIR) and daylight cameras mounted on a stereovision setup. Although daylight or FIR together. In order to gauge performances, a quantitative evaluation based on an annotated dataset

  19. Comparison of Control Strategies for Energy Efficient Building HVAC Systems

    E-Print Network [OSTI]

    Maasoumy, Mehdi; Sangiovanni-Vincentelli, Alberto

    2014-01-01T23:59:59.000Z

    optimal control design for HVAC systems. In Dynamic SystemOpti- mal control of HVAC systems in the presence of imper-consumption minimization of hvac sys- tems using model

  20. Control system for a small fission reactor

    DOE Patents [OSTI]

    Burelbach, J.P.; Kann, W.J.; Saiveau, J.G.

    1985-02-08T23:59:59.000Z

    A system for controlling the reactivity of a small fission reactor includes an elongated, flexible hollow tube in the general form of a helical coiled spring axially positioned around and outside of the reactor vessel in an annular space between the reactor vessel and a surrounding cylindrical-shaped neutron reflector. A neutron absorbing material is provided within the hollow tube with the rate of the reaction controlled by the extension and compression of the hollow tube, e.g., extension of the tube increases reactivity while its compression reduces reactivity, in varying the amount of neutron absorbing material disposed between the reactor vessel and the neutron reflector. Conventional mechanical displacement means may be employed to control the coil density of the hollow tube as desired.