Active Control of Foundation Transmissibility Using Magnetostrictive Actuators

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
May 08, 1992
Accession Number
ADA257135

Entities

People

  • Kenneth E. Poorman

Organizations

  • United States Naval Academy

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Actuators
  • Amplifiers
  • Control Systems
  • Engineering
  • Feedback
  • Filters
  • Frequency
  • Generators
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Power Amplifiers
  • Resonant Frequency
  • Systems Engineering
  • United States
  • United States Naval Academy
  • Vibration

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Electrical Engineering
  • Structural Dynamics.