Design of a magnetorheological damper with large damping force and nonlinear modeling at high velocity

Abstract

This paper proposes a magnetorheological damper with large damping force, and the damper has the function of preventing the precipitation of magnetorheological fluid. The damping force calculation model and hysteresis model at high velocity are obtained through theoretical derivation. First, a magnetorheological damper with radial damping gaps is designed and fabricated. Secondly, the dynamic characteristics of the designed magnetorheological damper at high velocity are tested. When the velocity increases to a certain range, the damping force increases nonlinearly. Considering the shear thinning effect of magnetorheological fluid at high velocity, a damping force calculation model of the magnetorheological damper at high velocity is established based on the Herschel-Bulkley model. A hysteresis model is proposed through the damping force calculation model. Finally, the accuracy of the two models is verified by comparing the models with experimental results.