Dynamic Simulation And Matching Research Of Motorcycle Suspension System

Suspension system is an important component of motorcycle, it has stronginfluence on handling, stability and ride comfort. With the improvement ofcomprehensive performance requirements from users, the research about motorcyclesuspension system is being paid more and more attention. In order to find the influenceof handling and stability affected by motorcycle suspension system, and improve theride comfort, the dynamic simulation and matching research of the125motorcyclesuspension system was completed.In the respect of handling and stability, the characteristics of motorcycle handlingand stability are illustrated, the control methods of motorcycle handling and stabilitysimulation are indicated using motorcycle dynamical software BikeSim. Therider-motorcycle system simulation model is established by the motorcycle dynamicalsoftware BikeSim, the steady state cornering characteristics test is simulated andanalysed, the simulated results agree with theoretical analysis, which proved thecorrectness that the BikeSim was used to simulate handling and stability. Steeringhandlebar impulse input transient response test is simulated, the influence of thetransient response test affected by castor angle, and the influence law curve is found.On the ride comfort side, the vehicle ride comfort tests under Grade B roadstochastic and impulse excitations are simulated. In order to reduce the pitching andvertical vibration, iSIGHT was used to drive BikeSim and MATLAB for themulti-objective optimization of suspension system, and Pareto optimal solution set isobtained, the anticipative optimized target is realized. The model making decision aftersearching the Pareto solutions is used, Pareto frontier is analysed according topreference structure binary relation, the influence law of Pareto frontier affected bysuspension characteristic parameters is found. Through the comparisons of pitching andvertical vibration RMS values、PSD and acceleration peak values before and afteroptimization, ride comfort is improved, health safety is increased, which proved theeffectiveness of the optimization method, which is a important reference supplied forthe improvement of ride comfort. In order to improve the ride comfort under Grade Broad stochastic excitation and accelerating-braking condition, the accelerating-brakingcondition is simulated, the maximum of pitch angle under accelerating-brakingcondition and the pitching and vertical vibration acceleration RMS values under GradeB road stochastic excitation are taken as optimized objectives, and the suspension property parameters as design variables, the parallel computing tasks were built usingiSIGHT to drive BikeSim and MATLAB, the multi-objective optimization was executedfor motorcycle suspension system. Pareto frontier is analysed, a method to find the goalweights is proposed according to Pareto frontier, and the optimal solution is obtained.The optimal result shows that the maximum of pitch angle under accelerating-braking isdecreased and the ride comfort is improved, which is an important reference for theimprovement of vehicle comprehensive performance under multi-loading cases.