Study on the Frequency Variation and Amplitude Variation Characteristics of HTS Bulks

High-temperature superconducting (HTS) maglev, with the excellent high-speed operation potential and environmental advantages, is a representative technology of independent innovation in the field of rail transportation. In the practical engineering applications, the maglev is constantly in the state of inevitable vibration. The influence of vibration frequency and amplitude on the levitation characteristics of HTS bulks will undoubtedly affect the vehicle's dynamic performance. In light of this, this paper investigates the frequency variation characteristics and amplitude variation characteristics of HTS bulks with the method of numerical simulation. Firstly, the dewar model which includes the HTS bulks, insulation boundaries, and liquid nitrogen is established. Secondly, the permanent magnetic guideway (PMG) model is established. Then, combine these two models into a finite element model (FE model) that considers the electromagnetic-thermal coupling. Finally, the frequency and amplitude variation characteristics of HTS bulks are studied by operating different frequencies and amplitudes to dewar. This study provides a detailed analysis of the frequency and amplitude variation characteristics of HTS bulks at medium and low frequencies, providing effective references for the dynamic response of HTS bulks' levitation characteristics.