A novel parametric model for magnetorheological dampers considering excitation characteristics

Abstract

In this study, a novel parametric model for magnetorheological (MR) dampers considering excitation characteristics (amplitude and frequency) is proposed. A MR damper is tested under different working conditions by adjusting the input current and changing the excitation amplitude and frequency, and the damping characteristics of the MR damper are obtained. And then a parametric model (Tanh model) describing the nonlinear dynamics of MR dampers is established and the parameters are fitted based on the test results. Further, a modified model considering the excitation characteristics is proposed, and the capability and accuracy of the two models in modeling and predicting the damping characteristics of the MR damper are compared in the case of changing the input current, excitation amplitude and excitation frequency. The results show that the proposed model has higher precision than the Tanh model, which can adapt well to the changes of current, excitation amplitude and excitation frequency, and can accurately predict the damping characteristics under the working conditions outside the test range. In addition, the proposed model is easy to invert, so a feed-forward control can be designed based on the obtained inverse model to realize the damping force tracking control of MR dampers.