Research Of Dynamic Characteristics Of Air Spring And Pantograph-catenary And Their Effects On Body Comfort

With the development of economy and science and technology, and also with theadvancement of people’s live standard, the safety and riding comfort of train arebecoming more and more important in our daily life. The continuous rising of trainoperation speed, the increasing of traffic density and the gradually aggravating of loadmake the dynamic interaction between the vehicle and structure more and morecrucial, especially for bridge structures. Based on the new vehicle-bridge model,which is a dimensional and all-side and includes vehicle, bridge and wheel-railinteraction, this paper studies the vehicle-bridge coupling vibration with nonlinear airspring and the contant relationship between pantograph and catenary. At last, thispaper evaluates body comfort while considering the above two subsystems. The maincontents are as follows:(1) Introduce the research methods, progresses and applications of air spring in recentyears. Based on the civil300km/h railway vehicle, a39-degree of freedom vehiclemodel is introduced. Considering the vertical nonlinearity of secondarysuspension accompanied with the the actual measured test results of air springvertical dynamic stiffness, vibration responses of both vehicle and bridge in tnesystem are calculated. Both periodic irregularities and random irregularities arediscussed.(2) A3-degree of freedom subsystem model of pantograph and a beam-bar-caplefinite element model of catenary are established. The pantograph model containslower arm, upper arm and pantograph head. It is coupled with catenary model withcontact force and displacement harmony conditions. The pantograph-catenarysubsystem is integrated with the vehicle-bridge system. The dynamic contactrelationship between pantograph and catenary is analysed and the influencefactors that affect the dynamic action of pantograph and catenary are alsodiscussed. The factors are track irregularity, mass of pantograph head, runningspeed and stiffness of contact spring.(3) A4-degree of freedom subsystem model of human body-seat is established. Themodel of body is composed of head, torso and viscera. The body-seat subsystem isintegrated with vehicle-bridge system with nonlinear air spring and pantograph-catenary subsystem. Consider every degree of freedom vibrationresponse of hunman body and take the weighted mean square value of vibrationaccelerations as the evaluation criterion of riding comfort. At last, discuss theeffects of body comfort caused by nonlinearity of air spring, track irregularity,running speed, spring stiffness and the namber of passengers.