Analysis And Bench Test Of Load Adaptability Of Dynamic Vibration Absorbing Nonlinear Inerter-Spring-Damper Suspension

Using inerter to replace traditional mass promotes the application and development of dynamic vibration absorption technology in vehicle engineering.The dynamic vibration absorbing Inerter-Spring-Damper suspension has a simple structure,which can improve the vibration isolation performance of the suspension,and improve the ride comfort and handling stability of the vehicle.However,when the vehicle load changes,the dynamic coupling relationship between the linear ISD suspension using a fixed inertance inerter and the main vibration system of the vehicle body will change accordingly,which affects the dynamic vibration absorption effect of the suspension and limits the further improvement of the suspension performance.In this paper,combining dynamic vibration absorption technology and the inertance displacement related characteristics of the nonlinear hydraulic inerter,a dynamic vibration absorbing nonlinear ISD suspension with vibration absorption mass can passively follow the load change is developed to further improve the performance of the suspension under different vehicle loads.The nonlinear ISD suspension conforms to the nonlinear development trend of suspension components,and at the same time has the characteristics of simple structure,no energy input,and easy layout of the actual vehicle.Firstly,the working principle of the hydraulic inerter is introduced,the model of the nonlinear hydraulic inerter is established,and the inertance displacement related characteristics of the nonlinear inerter is analyzed.The nonlinear inerter is applied to the single-mass suspension system,and the equivalent relationship between the nonlinear inerter and the fixed inertance inerter under different body masses is verified through the frequency response characteristics,which laid a theoretical foundation for the load adaptation analysis of the nonlinear ISD suspension.Secondly,combining the dynamic vibration absorption technology and the inertance displacement related characteristics of the nonlinear inerter,with the purpose of improving the load adaptability of the suspension,a dynamic vibration absorption nonlinear ISD suspension whose vibration absorption quality can follow the change of the vehicle load is developed.A genetic algorithm program suitable for the optimization of the comprehensive performance of the nonlinear ISD suspension is designed,and the key parameters of the nonlinear ISD suspension system are optimized.Thirdly,a more accurate mathematical model of nonlinear ISD suspension is established by considering the pressure loss of oil flow during the operation of nonlinear hydraulic inerter,and the sine and random input responses of the nonlinear ISD suspension under different loads are simulated and analyzed.The results show that the nonlinear ISD suspension has passive load adaptability,which can improve the driving comfort and handling stability of the target vehicle by passively adjusting the inertance characteristics of the nonlinear inerter with the change of load.Finally,a prototype of the nonlinear ISD suspension system is designed,and bench tests is carried out under different loads and road conditions.The results show that,compared with the fixed inertance ISD suspension,the nonlinear ISD suspension can significantly improve the low-frequency performance of the suspension,effectively suppress the vertical vibration of the vehicle body and wheel bounce,and better coordinate the ride comfort and handling stability.At the same time,the suspension does not require energy input,does not rely on the control system,and can realize the passive adaptation of the vehicle load.