Active Control of Foundation Transmissibility Using Magnetostrictive Actuators

摘要

The purpose of this project was to determine if vibrations could be activelycanceled 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.