Analysis and Experiment of Dynamic Behavior on a Thin Conducting Plate under Magnetic Field

Abstract

Numerical and experimental results on the dynamic behavior of a thin electrically conducting plate under strong magnetic field are described in this paper. Thin electrically conducting plates are used as the structural components of high-magnetic-field machines. When a transient field acts on thin structures, induced current produces electromagnetic force and thin structures vibrate. An additional current arising from the movement of a vibrating structure is induced and an additional electromagnetic force acts as a damping force. The dynamic behavior of thin structures can be evaluated by considering the electromagnetomechanical coupling effect. In this paper the authors present experimental as well as numerical results for the dynamic responses of a thin plate under electromagnetic force. Both results show good agreement in deflection amplitude and frequency. The magnetic damping effect for maximum displacement and stress was evaluated. The results suggest that the effective use of the effect might decrease the maximum stress in the thin structures.