Research on Characteristics of Load Distribution and Levitation Clearance Response in High-Speed Maglev Train With Electromagnets Overlapping Structure

Jimin Zhang, Zhao Xue, Qiao Ren, He-chao Zhou
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Abstract

For a certain type of high-speed maglev train with electromagnets overlapping structure, the vertical dynamics model of which was established based on multi-body system dynamics theory, electromagnetic field theory and automatic control theory, the distribution characteristics of the train load on levitation electromagnets were theoretically analyzed. The response characteristics of the levitation clearance, together with the influence of electromagnets overlapping structure on them were studied by numerical calculation. The research results show: it is the electromagnets overlapping structure that causes the uneven distribution of the train load on levitation electromagnets, furthermore leading to the uneven distribution of the levitation clearance at different levitation electromagnets; the larger the load borne by the levitation electromagnet, the smaller the steady-state value of its levitation clearance would be, and the fluctuation range of the levitation clearance would be smaller as well when disturbed by the outside. To avoid the non-uniformity of levitation clearance distribution among different levitation electromagnets, a design method for the vertical stiffness of primary springs based on the characteristics of train load distribution was proposed and proved to be effective by numerical calculation. Through above research, the influence law and mechanism of the electromagnets overlapping structure of high-speed maglev vehicle on its levitation clearance response is revealed, which has guiding significance in terms of operation safety evaluation and levitation control strategy design for the high-speed maglev vehicle. The new design method for the primary springs vertical stiffness shows certain reference for the structural optimization design of the maglev vehicle aiming at higher speed in the future.
电磁铁重叠结构高速磁悬浮列车载荷分布及悬浮间隙响应特性研究
针对某型电磁铁重叠结构高速磁悬浮列车,基于多体系统动力学理论、电磁场理论和自动控制理论,建立了其垂直动力学模型,从理论上分析了列车载荷在悬浮电磁铁上的分布特性。通过数值计算研究了悬浮间隙的响应特性,以及电磁铁重叠结构对悬浮间隙的影响。研究结果表明:正是电磁铁重叠结构导致列车载荷在悬浮电磁铁上的分布不均匀,进而导致不同悬浮电磁铁处的悬浮间隙分布不均匀;悬浮电磁铁所承受的载荷越大,其悬浮间隙的稳态值越小,受外界扰动时悬浮间隙的波动范围也越小。为避免不同悬浮电磁铁间悬浮间隙分布的不均匀性,提出了一种基于列车载荷分布特性的主弹簧垂直刚度设计方法,并通过数值计算验证了该方法的有效性。通过以上研究,揭示了高速磁悬浮车辆电磁铁重叠结构对其悬浮间隙响应的影响规律和机理,对高速磁悬浮车辆运行安全性评价和悬浮控制策略设计具有指导意义。本文提出的主弹簧垂直刚度设计新方法,对未来以更高速度为目标的磁悬浮列车结构优化设计具有一定的参考意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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