Attenuation and transformation of vibration through active control of magnetostrictive terfenol

Abstract A special magnetostrictive material (terfenol), when subjected to a properly controlled magnetic field, induces giant magnetostrictive motions. In an actuator (termed a mount) described in this paper, these motions are used to reduce and/or alter unwanted vibrational motions. Experimental results indicate that properly controlled magnetostrictive extensions can yield vibration isolation that exhibits significant low-frequency performance with small static deflection. In other experiments energy is added to and subtracted from an isolated system (through mount control) to alter the vibrational noise signature of the system. This work also reports on such experiments and demonstrates the ability to modify the vibrational response to disturbances.

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