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Vibration damping of elastic waves in electrically conducting media subjected to high magnetic fieldsThe propagation of vibrational energy in bulk, torsional, and flexural modes, in electrically conducting media can undergo strong attenuation if subjected to high magnetic fields in certain spatial arrangements. The reasons for this are induced Eddy currents which are generated by the volume elements in the media moving transversally to the magnetic field at acoustic velocities. In magnetic fields achievable with superconductors, the non-conservative (dissipative) forces are compared to the elastic and inertial forces for most metals. Strong dissipation of vibrational energy in the form of heat takes place as a result. A simplified theory is presented based on engineering representations of electrodynamics, attenuation values for representative metals are calculated, and problems encountered in formulating a generalized theory based on electrodynamics of moving media are discussed. General applications as well as applications specific to maglev are discussed.
Document ID
19920018503
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Horwath, T. G.
(TG and C Associates, Inc. Falmouth, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1992
Publication Information
Publication: NASA. Langley Research Center, International Symposium on Magnetic Suspension Technology, Part 1
Subject Category
Mechanical Engineering
Accession Number
92N27746
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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