Non-contact control of elastic vibration with magnetic damping for non-ferromagnetic plate

Abstract

This paper describes a method for non-contact vibration control of non-ferromagnetic conductive structures using electromagnetic force. This method has potential applications in conventional engineering and medical engineering. Elastic vibration is induced by an electromagnetic force, which is produced by the interaction between a magnetic field and the ed dy currents induced by a transient magnetic field. Since the int ensity of the electromagnetic force changes with the intensity or time variation of the transient magnetic field, the amplitud e or time variation of the elastic vibration can be controlle d by the transient magnetic field. On the other hand, the electromoti ve force induced by the deformation velocity and magnetic fie ld reduces the vibration, which is referred to as the magnetic damping effect. Since the magnetic damping effect reduces vibration and induces a time delay in the vibration response, consideration of the magnetic damping effect is required for non-contact vibration control of non-ferromagnetic structures using e lectromagnetic force. In this study, a method for controlling the vibration of non- ferromagnetic conductive structures using electromagnetic force is proposed, which is based on theoretical and one-degree-of-freedom models of vibration with magnetic damping. The parameters of the model are determined on the basis of the coupled eigenvalues obtained from the coupled finite element equation. Fee dback control is also used to realize vibration control. In order t o examine the validity and performance of the proposed vibration control method, vibration control experiments are carried out for various desired amplitudes and frequencies of vibration.