1 April 2014 Evaluation of magnetostrictive shunt damper performance using Iron (Fe)-Gallium (Ga) alloy
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This study presents the possibility of dissipating mechanical energy with a proof-of-concept prototype magnetostrictive based shunt circuit using passive electrical components. The device consists of a polycrystalline galfenol (Fe-Ga alloy) strip bonded to a brass cantilever beam. Two brass pieces, each containing a permanent magnet, are used to mass load each end of the beam and to provide a magnetic bias field through the galfenol strip. The voltage induced in an induction coil closely wound around the cantilever beam captures the time rate of change of magnetic flux within the galfenol strip as the beam vibrates. The first bending-mode resonant frequency of the device was 69.42 Hz. To dissipate the electrical voltage from the device, a shunt circuit is attached. The effective mechanical impedance for the magnetostrictive shunt circuit is derived. The shunted model is specialized for two shunt circuits: the case of a resistor and that of a capacitance. The experimental results for both the resistive and capacitance shunt circuits validate the shunted magnetostrictive damping model for couple of cased of resistance and capacitance.
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JinHyeong Yoo, JinHyeong Yoo, Andrew Murray, Andrew Murray, Alison B. Flatau, Alison B. Flatau, "Evaluation of magnetostrictive shunt damper performance using Iron (Fe)-Gallium (Ga) alloy", Proc. SPIE 9057, Active and Passive Smart Structures and Integrated Systems 2014, 90573I (1 April 2014); doi: 10.1117/12.2049010; https://doi.org/10.1117/12.2049010

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