Electromagnetic multi-mode shunt damper for flexible beams based on current flowing circuit

Abstract

In this paper, the multiple current flowing electromagnetic shunt damper was newly employed for the semi-active vibration suppression of the flexible structures. The electromagnetic shunt damper consists of a coil and a permanent magnet. The ends of the coil were connected to the multimode current flowing electromagnetic shunt circuit for vibration reduction of the cantilever beam employing energy dispersion method. The system was electro-magneto-mechanically coupled between the electrical circuit and mechanical vibrating cantilever beam with a electromagnetic transducer. The circuits were designed for first two mode control of the cantilever. The vibration and damping characteristics of the flexible beams with the electromagnetic shunt damper were investigated by tuning the circuit parameters. The effect of the magnetic intensity on the shunt damping was studied with the variation of the gap between the aluminum beam and the permanent magnet. The resistances of the shunt circuit were used to investigate vibration damping effect of cantilever. The theoretical prediction of frequency response of the beam under multiple mode electromagnetic shunt damping method has a good agreement with experimental results. Present results show that the magnet shunt damper can be successfully applied to reduce the vibration of the flexible structures.