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Proceedings Paper

Experimental comparison of piezoelectric and magnetostrictive shunt dampers
Author(s): Vivake M. Asnani; Zhangxian Deng; Justin J. Scheidler; Marcelo J. Dapino
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Paper Abstract

A novel mechanism called the vibration ring is being developed to enable energy conversion elements to be incorporated into the driveline of a helicopter or other rotating machines. Unwanted vibration is transduced into electrical energy, which provides a damping effect on the driveline. The generated electrical energy may also be used to power other devices (e.g., health monitoring sensors). PZT (‘piezoceramic’) and PMN-30%PT (‘single crystal’) stacks, as well as a Tb0.3Dy0.7Fe1.92 (‘Terfenol-D’) rod with a bias magnet array and a pickup coil, were tested as alternative energy conversion elements to use within the vibration ring. They were tuned for broadband damping using shunt resistors, and dynamic compression testing was conducted in a high-speed load frame. Energy conversion was experimentally optimized at 750Hz by tuning the applied bias stress and resistance values. Dynamic testing was conducted up to 1000Hz to determine the effective compressive modulus, shunt loss factor, internal loss factor, and total loss factor. Some of the trends of modulus and internal loss factor versus frequency were unexplained. The single crystal device exhibited the greatest shunt loss factor whereas the Terfenol-D device had the highest internal and total loss factors. Simulations revealed that internal losses in the Terfenol-D device were elevated by eddy current effects, and an improved magnetic circuit could enhance its shunt damping capabilities. Alternatively, the Terfenol-D device may be simplified to utilize only the eddy current dissipation mechanism (no pickup coil or shunt) to create broadband damping.

Paper Details

Date Published: 16 April 2016
PDF: 10 pages
Proc. SPIE 9801, Industrial and Commercial Applications of Smart Structures Technologies 2016, 98010R (16 April 2016); doi: 10.1117/12.2220302
Show Author Affiliations
Vivake M. Asnani, NASA Glenn Research Ctr. (United States)
Zhangxian Deng, The Ohio State Univ. (United States)
Justin J. Scheidler, Universities Space Research Association (United States)
Marcelo J. Dapino, The Ohio State Univ. (United States)

Published in SPIE Proceedings Vol. 9801:
Industrial and Commercial Applications of Smart Structures Technologies 2016
Steven F. Griffin, Editor(s)

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