中低速磁浮交通低置线路结构动力特性分析

Dynamic Characteristics Analysis of Low Set Line Structure of Medium and Low Speed Maglev Transit

为研究中低速磁浮交通低置线路的动力特性，依托株洲车辆厂的试验线开展现场试验，目的是测试在列车荷载作用下基床动应力分布和轨道梁的动力响应。测试结果表明：当列车达到试验最高速度80km／h时，基床动应力约为静止荷载（无悬浮力）的1．1—1．2倍，最大值约为14kPa。其随深度衰减较快，在1m深度时衰减值约为40％～50％。轨道梁梁端处动位移值较跨中大，最大值为0．066mm。顶板竖向加速度、腹板横向加速度、腹板纵向加速度均能满足设计要求。3种轨道梁在整体刚度上有所差异，但在不同梁型连接过渡时，对行车没有明显的影响。

In order to research the dynamic characteristics of low set line structure of medium and low speed maglev transit, the field test was implemented relying on the experiment line of Zhuzhou Electric Locomotive Co. Ltd, to test the dynamic stress distribution of bedding and the dynamic response of the track-beam under the train load. Results of the trial indicate that ： The maximum value of the dynamic stress in bedding is about 14 kPa which is about 1.1 - 1.2 times of the static loading （without suspension force） when the train reaches the maximum testing？ speed of 80 kin/h, it attenuates quickly with the depth and the attenuation value is about 40%- 50% when the depth is lm. The dynamic displacement value at the end of the track-beam is bigger than that at the center and the maximum value is 0. 066 mm. The vertical acceleration of the top plate, lateral acceleration and longitudinal acceleration of the web plate can meet the requirements of design. Three types of track-beam are different in integral rigidity, but the connection transition of different beam types has no obvious effect to the train operation.