skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measuring eddy current damping of a meso-scale spring-mass structure.


No abstract prepared.

; ; ;
Publication Date:
Research Org.:
Sandia National Laboratories
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
TRN: US200718%%29
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the International Modal Analysis Conference held January 30 - February 2, 2006 in St Louis, MO.
Country of Publication:
United States

Citation Formats

Mitchell, John, Sumali, Hartono, Wittwer, Jonathan W., and Epp, David S. Measuring eddy current damping of a meso-scale spring-mass structure.. United States: N. p., 2006. Web.
Mitchell, John, Sumali, Hartono, Wittwer, Jonathan W., & Epp, David S. Measuring eddy current damping of a meso-scale spring-mass structure.. United States.
Mitchell, John, Sumali, Hartono, Wittwer, Jonathan W., and Epp, David S. Sun . "Measuring eddy current damping of a meso-scale spring-mass structure.". United States. doi:.
title = {Measuring eddy current damping of a meso-scale spring-mass structure.},
author = {Mitchell, John and Sumali, Hartono and Wittwer, Jonathan W. and Epp, David S.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}

Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • The Yucca Mountain Site Characterization Project is studying physical and chemical properties of Topopah Spring tuff and coupled thermal, mechanical, hydrological, and geochemical processes expected in the near-field environment of the potential waste repository at Yucca Mountain, Nevada. Investigating the suitability of Topopah Spring tuff as a host rock for radioactive waste disposal includes measuring mechanical properties. Since heterogeneities vary with scale, from vugs and cracks at the hand-sample scale to fractures and vertical variations in degree of welding at the outcrop scale, mechanical properties of the tuff depend on scale. The Lawrence Livermore National Laboratory has planned a Largemore » Block Test (LBT) to investigate rock mass properties and coupled processes at elevated temperatures in Topopah Spring tuff at the scale of a few meters. This paper describes planned laboratory experiments in support of the LBT, to measure elastic properties and mechanical behavior of Topopah Spring tuff at the scale of a few cm to 1 m. The laboratory experiments will include measurement of stress-strain behavior, acoustic emissions during heating, and elastic wave velocities in small blocks of tuff.« less
  • Under DARPA sponsorship, a compact Superconducting X-Ray Light Source (SXSL) is being designed and built by the Brookhaven National Laboratory (BNL) with industry participation from Grumman Corporation and General Dynamics. The SXLS machine employs two 180{degrees} curved 4 telsa superconducting dipole magnets. These magnets are required to produce a dipole field for bending the beam but at the same time they must produce finite amounts of higher multipoles which are required for conditioning the beam. In fact uniformity of the field to less than 1 part in 10,000 must be maintained under all operating conditions. When a superconducting magnet ismore » ramped from zero to full field, the changing magnetic field produces eddy-currents in the magnet structure which in turn can produce undesirable multipoles. This paper discusses a simple method for estimating these eddy-currents and their effect on the field harmonics. The paper present the analysis basis and its application to the SXLS magnet support structure and to the beam chamber components. 5 figs., 1 tab.« less
  • A computer program was developed to model transient eddy current in thin, connected plates. Eddy current is deduced from the solution of an equivalent-network problem. Loop currents are introduced by a transformation as the unknown variables of the network equations (Kirchoff's laws). The network equations are solved numerically by the Runge-Kutta method. This program is quite efficient, allows for holes and multiple materials, and has built-in rotational symmetry options. For cases with known solutions, the model has been checked for both spatial and temporal profiles of the eddy current. Results are given for eddy current profile and eddy current lossmore » in the magnet case, support plate, and several other magnet structure members.« less