Simulation Study On Curve Passing Characteristic Of High Temperature Superconducting Maglev Vehicle

High-temperature superconducting(HTS)maglev is based on the magnetic flux pinning effect of the type-Ⅱ non-ideal superconductors,which have the advantages of self-stabilization,environmental friendliness,and no mechanical friction.It is increasingly receiving attention from many countries in the world now.At present,many HTS maglev test lines have been developed all around the world,and a large number of basic researches related to HTS maglev rail transportation have been carried out.The results show that HTS maglev trains have the potential for high-speed operation.HTS maglev is at the critical stage from laboratory to engineering application,but there are still many engineering problems that need to be explored and solved urgently.Carrying out dynamic research on HTS maglev vehicle system will effectively promote the development of HTS maglev technology.This thesis studies the dynamic response of the vehicle-bridge coupling system when HTS maglev vehicle passes through the curved line,and the main research contents and conclusions are as follow:The levitation characteristics of HTS bulks was explored.First,the effects of magnetic flux flow and magnetic flux creep on the drift characteristics of HTS bulks were simulated.Then the influence of the amplitude,frequency and field cooling height of the lateral and vertical vibration disturbances on drift is studied experimentally,the mechanism of the magnetic flux flow effect and the flux creep effect on the drift of HTS bulks was analyzed.An HTS maglev vehicle-bridge coupling dynamic model running on a curve line is established.A flexible bridge based on Euler-Bernoulli models were built.The levitation force and guidance force adopt a horizontal and vertical coupling two-dimensional electromagnetic force mathematical model.The HTS maglev vehicle-bridge coupling dynamic model is built based on the multi-body dynamics simulation software Universal Mechanism(UM).To ensure the secondary suspension parameters of the vehicle system,the dynamic response of the vehicle-bridge coupling system is simulated when HTS maglev vehicle passes through the curve line.The influence of vertical stiffness and damping,the lateral stiffness and damping of the secondary suspension on coupling system dynamic response was analyzed.The recommended values of the secondary suspension parameters are proposed,and the dynamic response of the vehicle-bridge coupling system at different operating speeds were analyzed.To study the influence of bridge line parameters on vehicle-bridge coupling dynamic response,the dynamic responses of vehicle-bridge coupling system at different bridge beam span,curve super-elevation and stiffness of bridge installation were studied,and the proposed values were proposed.The Sperling index was adopted to evaluate the vehicle stability when passing through curved lines at different speeds.The results showed that the vertical and lateral indexes of HTS maglev vehicle reached the "excellent" level when the speeds at the range of100～600 km/h.In this thesis,the drift characteristics of HTS bulks and the curve-passing characteristics of HTS maglev vehicle-bridge coupling system were studied,which provided references for the dynamic design of HTS maglev vehicles and track.