MR Damper Multi-field Coupling Analysis And Experimental Research

Semi-active suspension consist of controllabe shock absorbers,velocitysensors,acceleration sensors,controllers and other components.The damping force ofthe vehicle can be controlled during traveling by the control of the input currentintensity for the increase of the comfort and operating stability. MR damper is theactuator of the vehicle semi-active suspension system, it is the controllable damperfor the control of magnetorheological fluid viscosity coefficient by the control ofcurrent intensity. Such shock absorber can be applied widely in the semi-activesuspension system with its simple structure, fast response, low energy consumption,wide damping force adjustment range and simple control input signal.This paper studies the magnetorheological fluid working model, and thecalculation method of damping force of MR damper was derived from therheological equations of the plate model.With such method, the MR damperstructure was researched and analyzed according to the requirements of project,andthe prototypes of MR damper were finished.By using adina software, the simulation of the magnetic-fluid coupling and FSImethod was finalized for MR damper, and the solid and fluid dynamics models werebuilt. The boundary conditions, constraints, loads etc were set for FSI model andmagnetic-fluid coupling model. And by using pre-post processing module of adinasoftware, simulation analysis were carried out to get the analysis diagram of solidstress, dynamic characteristics of flow field, the magnetic field intensity distribution,speed features and characteristics of indicator.MR damper prototypes were developed. The bench tests were researched, thespeed and indictor characteristics were being made.According to the basic principleof MR damper, the velocity characteristics and characteristics of indicator wereanalysised respectively under non-controlling and energized condition, and benchtest results were compared with the simulation results.