Design And Experimental Study On Variable Stiffness Adjusting Mechanism Of Transverse Leaf Spring

Transverse leaf spring suspension can effectively reduce the vehicle sprung mass and provide more rear space for electric vehicles,which is a research hotspot in the field of vehicle suspension.However,the transverse leaf spring has integrity,so the stiffness of the automobile can not be changed after it is manufactured.With the change of sprung mass,the single stiffness can not meet the ride comfort and handling stability of vehicle suspension.In order to change the stiffness of the transverse leaf spring according to the change of the spring load mass,this paper proposes and realizes a variable stiffness adjusting mechanism of the transverse leaf spring.This mechanism can achieve the purpose of variable stiffness by changing the length of the arm of the subframe.Because the suspension should consider not only stiffness but also damping,the multi-objective optimization matching of stiffness and damping is carried out based on NSGA-Ⅱalgorithm.The motor drive model is established for the stiffness,and the two-stage damping variable damper model is established for the damping.On the basis of the above,the quarter vehicle model based on the variable stiffness of transverse leaf spring is established,the stiffness and damping are classified,and the simulation model is established.Compared with the passive suspension,the effectiveness of the variable stiffness suspension with transverse leaf spring is simulated and analyzed.The variable stiffness test bench and the electric control test device of regulating mechanism based on ARM7 are built.According to the results of bench test,the feasibility of variable stiffness of transverse leaf spring is verified.