交流磁场对车载高温超导块材导向力性能影响的数值模拟（英文）  

Numerical evaluation of the influence of ac magnetic field on guidance force of hts bulk over a ndfeb guideway

作　　者：张龙财[1] 

机构地区：[1]四川省广汉市中国民用航空飞行学院,618307

出　　处：《低温物理学报》2016年第3期10-15,共6页Low Temperature Physical Letters

摘　　要：高温超导块材在工程上有巨大的应用潜力,尤其是在高温超导磁悬浮列车系统应用方面.在磁悬浮列车系统中,沿NdFeB轨道横向的导向力是一个重要的参数.然而,由于NdFeB轨道表面磁场的不均匀性,车载高温超导块材始终处于交流磁场环境中.以前的实验研究表明,由于交流磁场的影响,车载高温超导块材的导向力会发生衰减.在工程实际应用中,如果导向力衰减加剧,则有可能影响整个磁悬浮列车系统的侧向稳定性.本文主要通过数值模拟的方法研究交流磁场对车载高温超导块材导向力性能的影响.研究结果表明,随着交流磁场幅值的增大,导向力的衰减也逐渐增加.当外加交流磁场的幅值较大时,导向力会在短时间内迅速的衰减.当外加交流磁场幅值较小时,导向力的衰减几乎与交流磁场的频率无关;当外加交流磁场幅值较大时,导向力的衰减会随着交流磁场频率的升高而增加.因此,在高温超导磁悬浮列车系统中,可以减少轨道表面磁场的不均匀性,即减少块材周围交流磁场的幅值,从而抑制导向力的衰减.Bulk superconductors had great potential for various engineering applications, especially in a high- temperature superconducting （HTS） maglev vehicle system. In such a system, the guidance force, a stable equilibrium force along lateral direction of the NdFeB guideway, was an important parameter. However, the HTS bulks in the vehicle system were always exposed to the AC magnetic field, which was generated by the inhomogeneous surface magnetic field of the NdFeb guideway. In our previous work, the experimental results showed that the guidance force of the bulks in the vehicle system was decayed due to the affect of the AC magnetic field. If the guidance force of the bulks onboard was decayed greatly, the stability of the whole maglev vehicle would be destroyed. In this work, we investigated the influence of the AC magnetic field on guidance force of HTS bulk over the NdFeB guideway by a numerical method. The results showed that the guidance force decay increased with the amplitude of the AC magnetic field. When the amplitude of the AC magnetic field was large, the guidance force of the bulk sharply attenuated in a very short time. Furthermore, the results also showed that the guidance force decay was almost independent of the frequency when the amplitude of the AC magnetic field was small, and when the amplitude of the AC magnetic field was large, the guidance force decay increased with the frequency of the AC magnetic field. Therefore, we could suppress the guidance force decay of HTS bulk in the maglev vehicle system by reducing the amplitude of the AC magnetic field generated by the inhomogeneous surface magnetic field of the NdFeb guideway.

关 键 词：导向力 交流磁场 数值 磁悬浮 

分 类 号：O511.3[一般工业技术—材料科学与工程]