The Design And Simulation Research Of MRF Damper With A New Structure

With the development of the automotive engineering,people have a higher requirements to the performance of the automotives.The ride comfort and the handling stability are related to the performance of the suspension system,so it has always been concerned by people .the structure and the parameter of the automotive suspension must be designed suitably to improve the ride comfort and the handling stability. For the traditional passive suspension,its damping and spring stiffnes can only settle for the given road status.while running on different road,the ride comfort and the handling stability canot be controlled well for the invariability of the suspension performance.the Application of the MR damper can solve the problem. The glutinosity of the MRF can be controlled by the magnetic field,so the damping of the suspension can also be controlled.by this approache,the ride comfort can be keep fine under the premise of the stability of the handling.In this paper,a new MR damper is designed to improve the performance of the automotive suspension.the suspension system is studied by simulating and analyzing. Firstly,The structure principle and the work model are introduced,and the damper force model under the mix mode is established. the analysis results show that the damping force is related to the structure parameters and the performance of the MRF.Secondly,a new MR fluid damper with a longer effective length gap was designed,which can increase the effective length of the damping gap . the external characteristic is analysised between two MR fluid dampers,the simulation shows that the damping force of the new MR fluid damper is larger.then the magneticfield field distributing of the new MR fluid damper is analyzed by the ANSYS FEM,by using the twin-stage magnetic circuit can decrease the magneticfield field in the piston and improve the distributing of the magneticfield field.Finally,use the fuzzy control method to simulate the suspension system by Simulink.a contrast between the fuzzy semi-active suspension and the passive suspension is made,it shows that by using the fuzzy control method,the body acceleration is decreased at a large extent,that is,the ride comfort is impr1ed. in addition ,the journey of the suspension is shorten,therefore the possibility of the impact between the suspension and the spacing. Besides, in order to analyse the effect of different input parameter to the the suspension ,simulating and analyzing was made under different velocity and different road status,the result show that the road status can most affect the ride comfort .