The optimal design of track magneto-rheological vibration isolator and performance testing

Abstract

It is very significant that magneto-rheological (MR) vibration isolator with adjustable parameters can be utilized to improve the low frequency vibration of a track system. Since the peak damping force of a prototype MR vibration isolator is too small, an optimum design method for the winding area structure of a new MR isolator is proposed. And the relationship of coil ampere-turns and coil power dissipation is derived. Moreover, the software Maxwell for electromagnetic field analysis is used to optimize the structure design of the new isolator. The MR vibration isolator is designed in squeeze mode and its performance is tested by MTS 858. The experimental results show that when the excitation loading of 2 Hz and 0.6 mm amplitude, and the 0.5 A drive current are applied, the maximum damping force can be increased by 58.3%, and damping dissipation capacity can be increased by 93.5%. When the excitation frequency and amplitude remain contant and the initial position of the piston keep changed, the vibration isolator can show variable characteristics of stiffness and damping, which is feasible to meet different vibration isolation requirements. This study could offer reference value for the optimal design of vibration isolation devices under similar conditions.