Development Of A Magnetic Suspension System For Reliable Vibration Damping Measurement

Item

Title
Development Of A Magnetic Suspension System For Reliable Vibration Damping Measurement
Report Number
WL-TR-91-3078 Volume I, p. DAC-1
Creator
Rao, Dantam K.
Corporate Author
Mechanical Technology, Inc.
Laboratory
Wright Laboratory
Date
1991
Date Issued
1991-08
Extent
1
Contract
Laboratory Research - No Contract
DoD Project
2401
DoD Task
240104
Identifier
ADA241311
Format
1 online resource
Abstract
The damping properties of viscoelastic polymeric materials, as measured by different organizations and test techniques, often differ considerably. Sources for the discrepancy include parasitic energy dissipation at clamped supports of sandwich beam configurations, as well as imperfect simulation of a perfect clamped end condition. This uncertainty can be eliminated by magnetically suspending the test beam in a free configuration, without mechanical contact for pickup or excitation. This paper will describe an approach to develop a proof-of-principle magnetic suspension system to levitate a typical test beam. The magnetic suspension system consists of an attraction electromagnet whose stiffness is controlled by closed loop feedback system. Controllable stiffness of magnetic suspension will help eliminate measurement discrepancies attributable to the use of different fixtures by different organizations to clamp sandwich beams.
FULL PAPER NOT AVAILABLE FOR
PUBLICATION
Description
The damping properties of viscoelastic polymeric materials, as measured by different organizations and test techniques, often differ considerably. Sources for the discrepancy include parasitic energy dissipation at clamped supports of sandwich beam configurations, as well as imperfect simulation of a perfect clamped end condition. This uncertainty can be eliminated by magnetically suspending the test beam in a free configuration, without mechanical contact for pickup or excitation. This paper will describe an approach to develop a proof-of-principle magnetic suspension system to levitate a typical test beam. The magnetic suspension system consists of an attraction electromagnet whose stiffness is controlled by closed loop feedback system. Controllable stiffness of magnetic suspension will help eliminate measurement discrepancies attributable to the use of different fixtures by different organizations to clamp sandwich beams.
FULL PAPER NOT AVAILABLE FOR
PUBLICATION
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Neeeded
Report Availability
Full text available
Type
article
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (Pages AAC-1 through DCC-19)
Media
article24