Vibration Control System Using Electromagnetic Forces

Abstract

This paper presents the concept of a new vibration control system in which motions of an Al-Fe alloy thin beam/plate with magnetized segments can be suppressed or activated through electromagnetic forces induced by an applied electric current. Analytical evaluation of the induced electromagnetic forces acting both on the electric current applied and on the magnetized segments are derived from an electromagnetic consideration. To examine the feasibility of the proposed vibration control system, we have formulated a simple regulator problem in which the disturbed motion of the thin alloy beam caused by an impulsive force is suppressed.

Modeling and experiments on eddy current damping caused by a permanent magnet in a conductive tube

“…Lee [11] studied the dynamic stability of conducting beam plates in a transverse magnetic field and demonstrated the existence of three regions of stability: damped stable oscillation, static asymptotic stability, and static divergence instability. Matsuzaki et al [12,13] proposed the concept of a new vibration control system in which the vibration of a partially magnetized beam is suppressed by using electromagnetic forces and performed an experimental study to show the effectiveness of their concept. Recently, Kwak et al [14] investigated the effects of an eddy current damper (ECD) on a cantilever beam, and their experimental results showed that an ECD can be an effective device for vibration suppression.…”

“…Additionally, several studies [10][11][12][13][14][15] have investigated the effects of magnetic fields on vibration in cantilever beams. Takagi et al [10] studied thin plate deflection in a magnetic field both analytically and through experimentation.…”

Design of a magnetic braking system

“…Eddy current braking concept is also applied in dynamometers [3]. The benefits of magnetic drag force are employed to develop various damping elements [4][5][6][7] for operating without needs of electronic devices and external power supplies.…”

Vibration suppression of a cantilever beam using magnetically tuned-mass-damper

“…Lee [13] studied the dynamic stability of conducting beam plates in a transverse magnetic field and demonstrated the existence of three regions of stability: damped stable oscillation, static asymptotic stability, and static divergence instability. Matsuzaki et al [14,15] proposed the concept of a new vibration control system in which the vibration of a partially magnetized beam is suppressed by using electromagnetic forces and performed an experimental study to show the effectiveness of their concept.…”

“…Additionally, there are several studies [12][13][14][15][16][17][18][19][20][21][22] that have investigated the effects of magnetic fields on vibration in cantilever beams. Lee [13] studied the dynamic stability of conducting beam plates in a transverse magnetic field and demonstrated the existence of three regions of stability: damped stable oscillation, static asymptotic stability, and static divergence instability.…”