| With the rapid development of society,people have more requirements for transportation.Compared with the traditional wheel-rail train,maglev train has the advantages of speed,energy saving and zero non-pollution,and has a good application prospect.Chinese maglev technology is developing rapidly.For example,permanent electric maglev train and high temperature superconducting nail maglev train have entered the engineering stage,while high temperature superconducting electric maglev train has just started.This paper combines CRRC Changchun Railway cooperation project "High Temperature Superconducting Maglev Transportation System Development Strategy and Technical Path Research Project",taking the experimental vehicles in the high temperature superconducting electric maglev test line as the research object,the vehicle-rail coupling dynamics model is established.The rigid-flexible coupling dynamics of high temperature superconducting electric maglev rail was studied.The influences of speed,vertical stiffness of second suspension,track length and other factors on the dynamic response of vehicle-rail system were analyzed.The contents of this paper are as follows:(1)Based on the dynamic circuit theory,the suspended and guided electromagnetic forces under the influence of vehicle speed,lateral migration,suspension height and other factors were calculated,and the spatial characteristics of the electromagnetic forces were analyzed.Considering the relative position relationship between the vehicle-mounted superconducting coil and the track figure-eight coil,an electromagnetic control model is established to solve the problem of applying electromagnetic force.(2)Through SIMPACK,ABAQUS,SIMULINK and other simulation software,the maglev vehicle model,the flexible track beam model and the electromagnetic control model are established respectively.Through SIMPACK,SIMULINK and ABAQUS co-simulation,the electromagnetic control of the vehicle and the rigid-flexible coupling of the rail are realized.The coupling dynamics analysis model of high temperature superconducting maglev test vehicle is established.(3)Based on the coupling model,speed,vertical stiffness of the second suspension and track length on the dynamic performance of the maglev vehicle and track were analyzed.The dynamic performance of high temperature superconducting electric maglev vehicle and track beam was comprehensively evaluated by referring to the dynamic indexes of the operating line of permanent conductivity maglev in China.The results show that the vertical vibration of the vehicle and the rail beam increases with the higher speed,and the vertical vibration acceleration of the vehicle and the vertical deflection of the rail beam are lower than limits.The higher vertical stiffness of the second suspension,the higher vertical vibration acceleration of the vehicle.The vertical vibration of the vehicle can be reduced by reducing the stiffness of air spring.The larger track length,the greater vertical vibration of vehicle and rail beam.(4)In this paper,the transverse and vertical irregularity spectra of high temperature superconducting maglev track were generated by referring to the standard of German permanent magnetic suspension track irregularity spectrum,and the ride stability of high temperature superconducting maglev vehicle was analyzed by applying the irregularity excitation to the track.The results show that under the influence of vertical and lateral irregularity,the ride index of the vehicle is less than 2.75,which is good;the vehicle’s lateral ride comfort changes significantly,and the vehicle’s vertical ride comfort changes significantly under the excitation of vertical irregularity. |
