Evaluation of Magnetostrictive Shunt Damper Performance Using Iron (Fe)-Gallium (Ga) Alloy
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD VEHICLE TECHNOLOGY DIRECTORATE
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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.
- Properties of Metals and Alloys