Study On Dynamic Characteristics Of High-Speed Maglev Guideway Considering Pier Vibration

Obvious deformation and vibration for guideway and piers,which influence structure safety,car running,and riding comfort of passengers directly,will appear when high-speed maglev trains run on the guideway/pier system.Studies on response of both simple and continuous guideway girders in maglev system have rarely taken account in the effect of piers until now.However,the influence of piers on dynamic characteristics of the whole structure will not be ignored with their heights getting larger and have great effect on the stiffness of the system.The dynamic interaction of maglev train and guideway/pier system has become an important problem in the course of high-speed maglev transport construction.A high-speed maglev train/guideway dynamic model considering pier vibration is established in the thesis.Based on the anlysis on the electromagnetic interaction and natural vibration of the guideway/pier system,the dynamic responses of vehicle, guideway and pier are calculated with the in-suit tested irregulaties as the outside motivation for the train-guideway-pier system.According to the simulation,the basic principle of the dynamic responses may provide theoretic foundation and refrence for parameter choice and scheme selection.The main research is as follows.(1) Based on the analysis on the electromagnetic and mechanical coupling relationship between the high-speed maglev train,guideway and pier,a dynamic model is established by means of modal analysis.The model applies theories of structure dynamics,vehicle dynamics and electromagnetic control.A programme on trainguideway -pier dynamic analysis is written,whose calculating results are validated by in-suit tested datum.(2) The characters of the horizontal,vertical,longitudinal section and structures on the maglev line are concluded.The technical requirements on system parameter, guideway and supporting structure are listed.The influence factors on the control parameters of riding comfort,guideway and supporting structure deformation are analyzed and compared with those of high-speed railway.The research here privides evaluating standard for dynamic performance of the guideway/pier system.(3) A electromagnetic interaction model is established,by means of which the influence of control scheme,control paremeters,guideway parameters on suspension performance are discussed.A series of electromagnetic parameters that ensure steady suspension are gained,the principles that may suppress oversize vibration are brought out.(4) A maglev guideway/pier system is established according to the engineering practice and calculate the eigenvalues and modes by subspace iteration method.The influence of guideway type,restraint,height and mass of pier,span numbers on natural vibration of the guideway/pier system are studied.The dynamic characteristics of the guideway/pier system provide foundation for analyzing the running safety and riding comfort when maglev trains run on the system.(5) The dynamic responses of the train,guideway and pier are simulated by the maglev train-guideway-pier model with in-suit tested irregularities as outside motivation.The vertical and horizontal resonances of the guideway/pier system are analyzed and the dynamic performance of the single and continuous guideway are evaluated.119 figures,20 tables,138 references.