New smart vibration control using electromagnetic forces

We have presented a concept of a new vibration control system in which a motion 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. To further exploit the proposed vibration control, in this paper we evaluate the effect of the self-inductance of the electric circuit of the control system, because the change in the electric current in a magnetic field induces the counterelectromotive force to oppose the change in current. Numerical evaluation shows that the self-induction of the circuit of the system is influential to control of sound, but little influence is given to suppression of vibration of a thin plate. To examine the feasibility of the proposed vibration control system, we treat a simple regulator problem in which the disturbed motion of a thin alloy cantilevered beam plate caused by an impulsive force is suppressed.