Analysis On The Hts Maglev Sightseeing Vehicle Levitation Frame Scheme

As a regional vehicle that serves tourist attractions specially,the sightseeing vehicle has shown strong market potential with the booming tourism and the specialization demand for scenic spots.Compared with the common motor sightseeing vehicle and the wheel-rail sightseeing vehicle,the magnetic levitation(maglev)sightseeing vehicle has the advantages of low noise and environmentally friendly,strong gradeability,small turning radius,and strong attraction to tourists.Recently,the maglev sightseeing vehicle has developed rapidly.Compared with the other maglev systems such as electromagnetic suspension(EMS)and electrodynamics suspension(EDS),the high-temperature superconducting(HTS)maglev technology has the advantages of self-stabilization,no need for complex control systems and support devices,static and dynamic levitation,etc.So the HTS maglev technology which has broad application prospects,is one of the new and important development directions of sightseeing vehicle.However,there are still many problems to be solved in the application of HTS maglev technology to the sightseeing vehicle.Among these problems,the levitation frame is the important content.At present,most of the HTS maglev vehicle levitation frames which are relatively simple,and most of them are only for experimental feasibility studies.Therefore,it is necessary to complete the performance analysis of the levitation frame based on the characteristics of the HTS maglev sightseeing vehicle.The thesis mainly focuses on the HTS maglev sightseeing vehicle levitation frame,and the following research works are carried out:(1)The structure scheme of the HTS maglev sightseeing vehicle levitation frame is analyzed.To cope with the complex road conditions of sightseeing routes,especially smallradius curved-track passing,the levitation frame is the key to solving the problem.Referring to the wheel-rail bogie and the EMS levitation frame,a HTS maglev sightseeing vehicle levitation frame is established based on the 3D software.In addition,the structure and function of each part are analyzed based on the levitation frame structure.And the transmission of lateral force,vertical force,and longitudinal force of the levitation frame are analyzed.(2)The structural static characteristics and structural dynamics characteristics of the HTS maglev sightseeing vehicle levitation frame frame are analyzed.The frame mesh model is established in Hypermesh software,and then imported to ANSYS Workbench software to finish the static strength analysis and modal analysis.The static strength analysis results indicate that the levitation frame frame meets the requirements of material allowable stresses and has enough bearing capacity.The modal analysis results show that the dynamic stiffness of the frame is reasonable,which can adapt to the curve lines with uneven lines and torsion.And the vibration excitation transmission is relatively smooth without jump and mutation phenomenon,which provides reference data for effectively avoiding vibration failures.According to the finite element analysis results,the structure scheme of the levitation frame can meet the application requirements.(3)The HTS maglev sightseeing vehicle dynamic responses are investigated.With the Universal Mechanism(UM)dynamics simulation software,the HTS maglev sightseeing vehicle model is established.Firstly,the dynamic responses of the vehicle system under different curve conditions are analyzed,and the effects of curve radius and passing speed on the vibration response are studied.Secondly,the influence of curve superelevation on the dynamic performance is analyzed.Moreover,the vibration response performance under the condition of levitation force characteristics difference is investigated.In addition,the dynamic response of the empty and full load vehicle are analyzed.According to the results of dynamic analysis,the HTS maglev sightseeing vehicle has great performance on passing curve section.The HTS maglev sightseeing vehicle has the overelevation and underelevation capabilities,and has a degree of fault tolerance capability.Finally,the increasing load will improve the vehicle dynamic performance,and the vehicle has good empty-weight load performance.(4)The vibration characteristics of the HTS maglev scale levitation frame model under different load conditions are tested.Based on the condition of constantly changing load,due to passengers getting on or off frequently,a HTS maglev scale levitation frame model and vibration equipment are used for experiments.The results show that the load variation has effect on the vertical natural frequencies and lateral natural frequencies of the scale levitation frame model.Moreover,the load weight has a certain influence on the vibration response.The appropriate load carried by the scale levitation frame model can improve the lateral and vertical vibration performance,which is consistent with the dynamics simulation results.It can be concluded that the scale levitation frame model has good performance under emptyweight load.In this thesis,the structural scheme analysis of the HTS maglev sightseeing vehicle levitation frame is completed.Based on the structural scheme,the static characteristics,structural dynamic characteristics,and dynamic response are analyzed.According to the results,the application of the levitation frame scheme to the HTS maglev sightseeing vehicle is reasonable and reliable.Moreover,the vibration characteristics of the scale levitation frame model under different load conditions are studied.The results indicate that the HTS maglev scale levitation frame model has good empty-weight load performance.It provides the suggestions and ideas for the innovation and development of the HTS maglev levitation frame and the HTS maglev sightseeing vehicle in the future.