Affiliations: [a] Department of Mechanical Information Science and
Technology, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka
820-8502, Japan
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 eddy currents
induced by a transient magnetic field. Since the intensity of the
electromagnetic force changes with the intensity or time variation of the
transient magnetic field, the amplitude or time variation of the elastic
vibration can be controlled by the transient magnetic field. On the other hand,
the electromotive force induced by the deformation velocity and magnetic field
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 electromagnetic 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. Feedback control is also used to realize vibration
control. In order to 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.
