A Ferrofluid-based Planar Damper with Magnetic Spring

The ferrofluid-based damper has been a subject of active research recently in depressing low-frequency vibration of rod due to its relative small viscous damping for the vibration pick-up system. In this work, a novel ferrofluid-based planar damper with magnetic spring is firstly proposed. Compared with the traditional ferrofluid-based damper with the elastic restoring force of ferrofluids, the novel damper is designed with steady magnetic spring to obtain a large relative displacement and dissipate external vibration energy efficiently. Experimental results show that the novel damper has a high damping performance. Under the same initial vibration amplitude of beam, the logarithmic decrement of the system with the novel damper is 31.5 times and 5.5 times larger than those of the system without damper and with the traditional damper, respectively. In addition, compared with the system with the traditional damper, the system with the novel damper can reduce damping time by half.