Coil Based Electromagnetic Damper Using Semi-passive Switching Method

In this study, the semi-passive electromagnetic switching shunt damper was newly employed for vibration suppression of a cantilever beam integrated with a copper coil and a permanent magnet. The control system for the vibration suppression of the beam consisted of a permanent magnet attached to an aluminum beam and a coil installed below the magnet. The switching system operates while the voltage of coil is larger than the reference voltage value. The frequency response function of a beam with the theoretical model of the electromagnetic switching system was predicted, and its accuracy was compared with the experimentally measured data. Also, the time responses with and without switching control were investigated. The results show that the electromagnetic switching shunt damper can be successfully employed to vibration control of flexible structures.