Impact of track irregularities on the motor suspension of high-temperature superconducting maglev trains
In the operation,high-temperature superconducting maglev trains are susceptible to the impact of random track irregular-ities.These irregularities cause vibrations of the carbody and maglev frame,which are transferred to the dynamic components of the lin-ear motor,resulting changes in the air gap.The changed electromagnetic force reacts against the motor suspension system,causing fur-ther vibrations of the maglev frame and carbody.The coupled vibrations of both components influence the safe operation of high-temper-ature superconducting maglev trains to some extent.To mitigate the influence of random track irregularities on the motor suspension sys-tem,a multi-rigid-body dynamic theory model was established in this study.Through simulation verification of the dynamic response un-der periodic excitations,the correctness of the dynamic theory model was confirmed.Furthermore,within UM software,with the linear motor normal force and random track irregularities as external excitations,a simulation of the dynamics model of the high-temperature superconducting maglev train was conducted.The influence of the vertical stiffness of the motor suspension system on the air gap of the linear motor,the vibration of the carbody and suspension frame,and the train ride comfort was studied,and the optimal value for this stiffness was determined.The results show that increasing the vertical stiffness of the linear motor suspension system to a certain extent can improve the stability of the carbody.Additionally,increasing the vertical stiffness can reduce the variation in the air gap and motor vi-bration to a certain extent,thus decreasing the coupling effect with the suspension frame.The results obtained in this study are based on simulation analysis under specific structural parameters and load conditions,and they can provide valuable insights for the dynamic anal-ysis of high-temperature superconducting maglev trains.
random track irregularitiesnormal forcehigh-temperature superconducting maglev trainlinear motor suspensionUM
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