Nonlinear Dynamic Analysis And Semi-active Control Of Air Spring Suspension System

With the rapid development of high-speed railways in China,people have higher requirements for trains,with the most important being faster speed and better ride comfort under the premise of safety.The vehicle suspension system,as an important means of transmitting force to support the vehicle body,plays a crucial role in vehicle design.This article focuses on the vibration control of air suspension systems containing Bouc wen models,mainly including:(1)The Bouc-wen model is established in this thesis as the research object,with the air suspension system model.Employing the least square method,the model parameters are identified based on the test data of a subway air spring.The uniformity between the fitting results and the test results confirms the accuracy of the Bouc-wen model.(2)The Bouc-wen model is employed to model the single degree of freedom 1 /4vehicle suspension system,and its main resonance under harmonic excitation is investigated.By the average method,an approximate analytical solution of the system is attained,and the steadiness of the steady solution is then assessed.The numerical solution is then contrasted to the steady one yielded by the analysis,and the accuracy of the approximate analytical answer is confirmed.Lastly,the influence of the parameters in the Bouc-wen model on the dynamic characteristics of the system is thoroughly examined.Through comparison,The Bouc-wen model parameters are found to be more precise in portraying the air spring hysteresis properties,thus providing a foundation for its utilization in vehicle suspension systems.(3)Based on an air suspension system with Bouc-wen model,the vibration control problem of a single degree of freedom 1/4 vehicle suspension system under harmonic excitation was studied using a canopy control strategy and a canopy control strategy,respectively.Based on the average method,the periodic solutions of the main resonance of the system under the canopy control strategy and the canopy control strategy were obtained,and the stability of the periodic solution under semi-active control was analyzed.An examination of the system stability conditions and the impact of semiactive control on ride comfort showed that,while it can significantly reduce the suspension spring load mass vibration amplitude,semi-active control is not a viable solution.,ceiling control has a superior effect compared to floor control.Furthermore,Examining the effect of canopy and canopy vibration control parameters on the control effect was also done.