中文摘要：

当真空管道中的气压降到一定值时，其中运行的高温超导磁浮车所受到的空气阻力近似省略。那么磁浮车的运动方向上的动能会因为磁轨道上有接头或其它原因导致轨道上表面磁场的分布不平衡而转移到与运行垂直方向上的振动而损耗掉。对一个已设计好的轨道，其缺陷是不可避免的，文中讨论磁浮车在这种轨道上的动能损耗与磁浮车运行速度的关系。将一定真空环境中运行着的高温超导磁浮车的这种振动近似为弹簧的阻尼振动，然后根据高温超导体的特性及相应测量值来确定其刚度系数与阻尼系数，从而考虑其阻尼振动的动能损耗情况。模拟了三种振动产生方式的耗能情况，与实验结果相符合，表明了能耗规律及其在真空管道运输设计与应用中的参考价值。

英文摘要：

To study the kinetic energy loss on maglev on evacuated tube transportation （ETT） , the high temperature superconductivity （HIS） maglev train is used. The aerodynamic drag and the friction between the train and the permanent magnetic guideway （PMG） are neglected when the maglev is running in the evacuated tube. So the energy loss is due to the heterogeneous distribution of the flux in the train＇s running direction along the PMG. The damped vibration whose direction is perpendicular to the direction of the track is mentioned to describe this process. Three methods of the reason for initial displacement are considered. It illustrates that the energy loss process in ETT could be considered as a damped vibration. And then this process is verified on an experimental ETT system. It demonstrates that this is reasonable for designing and using in ETT.