Abstract
For high-temperature superconducting levitation systems, chaotic vibrations occurred under external disturbance, as shown in previous studies. The electromagnetic characteristic of a high-temperature superconductor (HTSC) plays a crucial role in the dynamic stability of levitated systems. In this article, we numerically investigate the HTSC-PM levitation system in nonlinear motions by the finite element method. We analyzed the displacements, temperature, electromagnetic forces, and magnetic field of the HTSC. The results show that the nonlinear vibration transitions from chaos to period-doubling vibration with the HTSC’s temperature and magnetic field change. Furthermore, we select two states from chaos and period-doubling to analyze the natural frequencies. The results show that the electromagnetic characteristics of the HTSC affect the natural frequency of the system.
Highlights
High-Tc superconducting magnetic levitation systems could maintain a steady-state without energy input
The dynamic stability of high-temperature superconducting-PM systems should be strictly relevant to the magnetic force, which is critical for efficient operation
Huang et al studied that the high-temperature superconductor (HTSC) of superconducting maglev systems heats up rapidly when the external vibration frequency was close to the natural frequency
Summary
High-Tc superconducting magnetic levitation systems could maintain a steady-state without energy input. The dynamic stability of high-temperature superconducting-PM systems should be strictly relevant to the magnetic force, which is critical for efficient operation.. Most of the works neglected the nonlinear hysteretic nature of levitation systems, which is considered a key factor of bifurcation and chaotic vibration.. Except for the magnetic force, the system’s stability is due to the nonlinear hysteretic behavior of the HTSC. Huang et al studied that the HTSC of superconducting maglev systems heats up rapidly when the external vibration frequency was close to the natural frequency.. We present simulation studies on the electromagnetic force, PM’s displacements, and the temperature of the HTSC in chaos and period-doubling vibration. The results show that the electromagnetic characteristics of the HTSC influence chaotic vibration
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