Numerical Analysis of the Effect of Temperature and External Stochastic Excitations on HTS Bulk’s Levitodynamics
Tóm tắt
High-temperature superconducting (HTS) maglev, named as the most promising technology of the future transportation, has attracted more and more attention, especially on the dynamic characteristics. In practice, the temperature varying inside the bulk together with the irregularity of the permanent magnetic guideway (PMG) directly and simultaneously affects the levitation and guidance force. This paper takes the HTS bulk, liquid nitrogen (LN), and PMG into account to establish the two-dimensional magnetic-thermal-guideway coupled model by using COMSOL Multiphysics. In order to simulate the magnetic field fluctuation caused by the PMG’s arrangement irregularity, we add the test track irregularity spectrum of high-speed railway to the PMG. The temperature effect on levitation and guidance force is simulated and analyzed under four conditions of excitations as well as comparing with the model without considering the temperature. The results show that the temperature and coupling of excitations in both directions simultaneously affects the magnitude of levitation and guidance force, and the difference caused by above two factors is significant, which makes a better understanding of the relation between the force and temperature and provides an effective reference for the HTS bulk’s dynamic analysis.
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