Structural Design And Analysis Of Magnetorheological Damper

Magnetorheological damper(MRD),a semi-active vibration damping device,which using magnetorheological fluid(MRF)as a medium has a series of advantages such as simple structure,low energy consumption,continuously adjustable damping,and fast response speed.MRD is widely used to vehicle suspension / seat,bridge or house in shocking absorption,equipment or human bones and also other fields.The magnetorheological damper has many advantages and also has some significant shortcomings.For example,the existence of nonlinear hysteresis seriously affects the accuracy of mathematical model and also control speeding or efficiency of the damper control system.Hysteresis is a micro-physical characteristic exhibited by damper's system and cannot be eliminated.Nowadays,scholars use correction and compensation methods to reduce the effect of the nonlinear hysteresis in the entire damper system,but the results are only approximate.So that the research on the nonlinear hysteresis is still a difficult problem.In view of the air cavity complexity of the commercial magnetorheological damper impacts itself on the system output.And the non-linear phenomenon of the damper system not only includes the non-linear phenomenon of MRF and solenoid valve magnetic materials,but also mixed with gas and nonlinear phenomena generated by the structure itself in vibration that increases complexity of nonlinear analysis of the system.Therefore,by designing a bipolar magnetorheological damper with double barrels and double rods,this paper wants to remove the impact of the complicated gas in the output of damper system,and also explores the structure by using a low magnetorheological-basing liquid(silicone oil)as the medium to explore the change law,non-linear phenomenon and its causes in vibration.And then by improving the structure to reduce the effect of the non-linear phenomenon on the system output.Then using magnetorheological fluid as the medium to test and verify the magnetic field design and structure.After establishing a complete and reliable MRD experimental platform,and also provide a reliable experimental platform for subsequent scholars in the study of the impact of MRF on MRD.This paper focuses on the structural design and analysis of magnetorheological dampers.Firstly,the working principles of magnetorheological fluids and magnetorheological dampers are introduced,and then the research overview of scholars at home and abroad is described.Secondly,a bipolar magnetorheological damper with double barrels and double rods is designed.The rationality of the magnetic field design and the feasibility of the structural design scheme are verified through magnetic field simulation,and the key parameters of the solenoid valve are simulated and analyzed.Finally,the magnetorheological damper is processed and an experimental platform is constructed,and the composition,causes and changes of the output force of the magnetorheological damper are analyzed;Summarize and confirm the change law of the damper structure itself in vibration and the friction characteristics of viscoelastic materials;By improving the structure,the influence of the nonlinear phenomenon of the damper structure itself on vibration on the system output is reduced,and a complete and reliable MRD experiment platform is set up.