| High-temperature superconducting（HTS）maglev is a self-stabilization levitation mode based on the magnetic flux pinning effect of the type-II nonideal superconductor YBa 2C u3 O7-x,which has the advantages of simple and reliable principle,environment-friendly no mechanical friction and so on.It is getting more and more attention from the society.Currently,many HTS maglev lines have been built in the world.This technology has a broad application prospect in the future,and it is in the critical stage of engineering application from laboratory.In the existing maglev line,the viaduct line is the prevalent choice.In order to suppress the excessive vehicle/rail coupled vibration,in the practical engineering application,the method of sacrificing the engineering cost by improving the rigidity of the track beam,increasing the linear density and damping of the track beam is often used to exchange for the high performance of the vehicle,which is not conducive to the promotion of maglev transportation technology,and the HTS maglev system may face the same problem in the future.At present,it is not realistic to determine the design requirements of the track beam reasonably through the line test method.It has become an effective method to simulate the operation environment of the maglev train in laboratory by building the vehicle/rail coupled vibration test bench.The main research work of this thesis is to design the HTS maglev vehicle/rail coupled vibration test-bed.Based on the similarity theory,the dynamic response of the HTS maglev vehicle/rail coupled vibration test-bed under different influence factors is analyzed and compared.The specific research is as follows:（1）This thesis studied the principle and characteristics of the HTS maglev vehicle/rail coupled vibration test-bed,designs the structure of the HTS maglev vehicle/rail coupled vibration test-bed,and analyzed the simulation method of the vibration test-bed for the mass,equivalent stiffness and span of the track beam.（2）The appropriate mathematical model of the levitation force is selected and the simulation of the levitation force of HTS is realized in UM.Then,the model of HTS maglev vehicle/rail coupled vibration test-bed and the model of HTS maglev vehicle-bridge coupling vibration are established.（3）Based on the similarity theory,this thesis discusses and analyzes the similarity relationship of the track beam,the ratio of original bridge model to prototype to 1:2,through comparing the dynamic response of the scale model and the prototype vehicle-bridge coupling system,and verifies the feasibility of applying the similarity theory to the partial proportion of the track beam of the HTS maglev vehicle/rail coupled vibration test-bed from the result coincidence.（4）The dynamic response of these two models,the HTS maglev vehicle/rail coupled vibration test-bed and the HTS maglev vehicle-bridge coupling vibration system,are simulated and calculated respectively under different air springs,different vehicle speeds and different bridge spans,and the simulation results of the two models are compared and analyzed.The results show that the agreement between The dynamic response of the two models,which shows that it is theoretically feasible to build a high temperature superconducting maglev vehicle/rail coupled vibration test-bed in laboratory to carry out the dynamic response analysis test of the high temperature superconducting maglev vehicle-bridge coupling vibration.In conclusion,in order to verify the rationality and feasibility of the HTS maglev vehicle/rail coupled vibration test-bed,this thesis studies the structure of the HTS maglev vehicle/rail coupled vibration test-bed and the dynamic response characteristics of its simulation model.After being compared with the dynamic response of the vehicle-bridge coupling model,the feasibility of the vibration test-bed design of the is theoretically verified.The relevant research results provide a theoretical basis and reference for the further construction of the vibration test-bed. |
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