Active Control of Foundation Transmissibility Using Magnetostrictive Actuators
Final rept. 1991-1992
NAVAL ACADEMY ANNAPOLIS MD
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The purpose of this project was to determine if vibrations could be actively canceled using a magnetostrictive actuator, a device which applies force when exposed to a magnetic field. The periodic vibrations associated with rotational equipment such as motor-generators were the primary focus of this research. Using acceleration feedback of the foundation only, the magnetostrictive actuators were driven by a filtered signal while being biased with a DC current. The magnitude of vibrations decreased by almost twenty decibels at the resonant frequency. Frequency feedback from the tachometer was added to control an activation threshold. As a result of this research it is predicted that a digital controller would be better suited to active control of rotationally induced vibrations. Magnetostrictions Magnetohydronamic generators Actuators Rotational motion Mechanical vibrations Damping mechanics Rare earth metal alloys.
- Electrical and Electronic Equipment
- Electricity and Magnetism
- Plasma Physics and Magnetohydrodynamics