Accession Number:

ADA257135

Title:

Active Control of Foundation Transmissibility Using Magnetostrictive Actuators

Descriptive Note:

Final rept. 1991-1992

Corporate Author:

NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s):

Report Date:

1992-05-08

Pagination or Media Count:

51.0

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.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism
  • Plasma Physics and Magnetohydrodynamics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE