Static And Dynamic Research In Hts—pm Levitation System

High temperature superconducting maglev system which possesses characteristics of self-stabilization, energy conservation, environmental protection and some other advantages, is taken more and more attention in the21st century, and more and more widely studied around the world.In the overall study, people explored much about levitation force and guidance force under static situations. However dynamic characteristics were not studied thoroughly, especially in the practical application. Based on the vacuum-pipe maglev simulation system, we firstly studied the factors that influence the levitation force and guidance force under static situations, and then optimized the system under dynamic and static situations in this paper. Finally, we carried on the dynamic analysis for the multi-superconducting maglev system, and concluded the dynamic characteristics of it are much more complex than that of single-block system.In the first chapter, the topic background, superconducting material and theory are summarized. Especially, the development of the superconductor, superconducting properties and basic theories are introduced. Finally the structure of the paper is described.In the second chapter, it is focused on the development of maglev vehicle and vacuum-pipe maglev. The maglev technology and maglev vehicles of the world are introduced respectively. Finally, the development of the vacuum-pipe is introduced.The relationship between the levitation force and the space of the levitation maglev system, the effects of field-cooling height and arrangement ways of superconducting bulks on the characteristics of maglev system, as well as the hysteretic phenomenon observed in experiments are studied in the third chapter. Finally, the guidance force is briefly tested.In the fourth chapter, we studied the effects of magnet and superconducting block thickness on the levitation force and system dynamic stability. The experimental results show that levitation force increases with the increase of the thickness of the magnet and superconductive block, but not significantly obvious when to a certain thickness (for example,the thickness of superconducting is up tol8mm and magnet is30mm in the paper). According to the dynamic analysis, the increase of the thickness will weaken the system stability. Meanwhile, the increase of the thickness brings the inevitable increase of the space and cost. Therefore, that does not mean the thicker of the magnet and a superconductor, the better of their performance. Thus we should optimize the system according to actual condition.In the fifth chapter, we studied the vibration characteristic of the multi-superconducting maglev system through the spectrum analysis of the incentive and response signals. The vibration characteristics of HTS maglev systems with multi-blocks are more complex than that of single-block systems due to the interaction between excitation and response, as well as the parallel plurality of different damping systems for the multi-block bulks。...