Vibration Characters Research In HTS-PM Levitation System

As High-temperature superconductor material which can achieve self-stabilization and non-contact suspension is a new material in the 21st century.The suspension system will be affected by vibration interferences caused by the system itself and some of other external causes in practice. Superconducting magnetic levitation system can to be a self-stability and non-contact suspension system, but it does not mean that the system can insulate some of the vibration interferences caused by outside world. In this paper, the vertical vibration responses of YBCO bulks superconductor maglev system on different suspension heights and different vibration frequencies are investigated.The resonant frequencies of the suspension system are studied and the levitation force characteristics of the system are analyzed.In the first chapter, the development process of the superconducting material and results is pictured. The zero-resistance characteristics of superconductors and completely magnetic resistant effects of the two properties YBCO bulks superconductor is Introduced.At last the content of this thesis and the main structure is described.In the chapter II, the theory and application of high temperature superconducting magnetic levitation is briefly introduced.maglev train and a number of relatively mature developed maglev technologies are also depicted. Then the flux jumping and flux creeping characteristics of the two main factors which affect the suspension are introduced.The experimental device and test method are briefly pictured in the third chapter, permanent magnet rail and YBCO high-temperature superconductor bulks are introduced.The vertical vibration responses of YBCO high-temperature superconductor magnetic levitation system are studied in the fourth chapter. A mathematical mechanical model of the experiment is established, the suspension system's response to small vibrations by the outside world is analyzed in theory. Then the vibration property of the suspension system is experimental researched. At the last of the chapter, the resonances at different heights of the system are studied. Several methods of the suspension system optimization are raised.The magnetic hysteresis of the suspension system is studied in the Chapter V. The hysteresis effect of the suspension system at different levitation heights and different experiment processes of the same levitation height are analyzed.