Based On Steering Stability And Comfort Of The Suspension Design And Optimization

In recent years, with the rapid development of the global economy, and ageneral improvement in living standards, the automobile gradually become anessential transportation tool in the life of the people. Due to the rapiddevelopment of highway, the vehicle speed is more and more quickly, and themileage become more and more long. Therefore, the security, stability andcomfort has become an important index to measure the performance of vehiclefor people, and the suspension system as the key part of the chassis, directlyaffects the performance of vehicle. Based on the above analysis, this paper putforward a suspension design method based on the handling stability andcomfort.The Mcpherson suspension as the research object, first the suspensionguiding mechanism, the stiffness and damping are calculated and analysed bygraphic method and calculation method, and the1/4and whole vehiclemulti-body system dynamics model is established according to the result of thedesign in the dynamics analysis software. Then the structural parameters of thesuspension are analysed and corrected based on suspension kinematics-theoryand the lateral load of shock absorber between the piston rod and sleeve is donesimulation analysis and optimization.Unlike other studies on driving stability and comfort suspension, this article,based on the theory of multi-body system dynamics, selected the weightedacceleration of vibration of the driver’s seat at the random road input experimentto evaluate the performance of the vehicle ride comfort; select the time-domainresponse and frequency domain characteristics of the vehicle to evaluate toevaluate vehicle handling stability by angular step experiment, angle pulseexperiment and steady rotation experiment. On this basis, this article, based onthe response surface approximation model theory, the front and rear suspensionstiffness and damping and stabilizer bar stiffness as design variables, establishedthe second-order response surface model of vehicle handling stability andcomfort.Finally, suspension Parameters are optimized using the NSGA-Ⅱ multi-objective optimization algorithm, and get the best design results. Afterexperimental analysis, it is proved that this method has higher accuracy andpracticality, providing one more excellent new method for suspension.