Evaluation of Magnetostrictive Shunt Damper Performance Using Iron (Fe)-Gallium (Ga) Alloy

Report No. ARL-TN-0566
Authors: Andrew James Murray and Dr. JinHyeong Yoo
Date/Pages: September 2013; 18 pages
Abstract: Structural vibrations can be controlled by active or passive methods. Active control uses sensors and actuators, and requires controls. Passive control methods gradually reduce vibration by dissipating energy through dampers including rubber, hydraulic dashpots, or friction. Magnetostrictive materials (iron [Fe]-gallium [Ga] alloy, for example) can be used in passive structural vibration damper elements. Magnetostrictive materials are distinguished by the phenomenon of dimensional changes occurring in response to a change in the magnetization of ferromagnetic material. The inverse is also true, whereby magnetization occurs in response to changes in applied stress fields. The magnetostrictive material can harvest electricity out of structural vibrations. To dissipate the electrical energy from the energy harvester configuration, a shunt, or a load, is attached. With careful tuning the shunt can increase the efficiency of the magnetostrictive damper. The ideal levels of resistance and capacitance in the shunt are investigated to maximize the shunt damper performance. Comparisons to the effectiveness of piezoelectric shunt dampers are discussed.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2013