磁浮列车-桥梁耦合自激振动机理分析与仿真验证

发布时间：2018-02-22 12:54

本文关键词： 磁浮列车自激振动机理分析仿真验证　出处：《振动与冲击》2017年18期 　论文类型：期刊论文

【摘要】：当磁浮列车静止悬浮在某段桥梁上时,磁浮列车的电磁铁和桥梁会同时出现大幅垂向振动,这种现象被称为磁浮列车-桥梁耦合自激振动;目前国内外对于该问题的研究不够完善,振动产生的机理认识也不够清楚;同时在工程上,车-桥梁耦合自激振动问题仍未得到很好解决。为此,从三个不同角度来分析车-桥梁耦合自激振动的基本原理;首先建立了单悬浮点-弹性桥梁简化的耦合模型,并基于此最小耦合模型,从能量传递的角度阐述了自激振动的机理,并指出悬浮系统在特定频段的有源性是导致自激振动产生的根本原因;其次,将桥梁子系统作为整个耦合系统的前向通道,将悬浮子系统视为耦合系统的反馈通道,由此从耦合系统的特征多项式的角度分析了自激振动的机理;最后根据系统开环传递函数,利用稳定性判据分析了自激振动的基本原理。基于上述分析,得出了四个有效结论,为认识并解决自激振动问题提供了理论参考;针对构建的整个动态模型,进行了相应的数字仿真分析,仿真结果验证了所得出结论的正确性。
[Abstract]:When the maglev train is suspended on a certain section of the bridge, the electromagnetic and the bridge of the maglev train will simultaneously have a large vertical vibration, which is called the coupled self-excited vibration between the maglev train and the bridge. At present, the research on this problem at home and abroad is not perfect, and the mechanism of vibration generation is not clear enough. At the same time, the problem of vehicle-bridge coupling self-excited vibration is not well solved in engineering. The basic principle of vehicle-bridge coupling self-excited vibration is analyzed from three different angles. Firstly, the simplified coupling model of single suspension point and elastic bridge is established, and based on the minimum coupling model, This paper expounds the mechanism of self-excited vibration from the point of view of energy transfer, and points out that the source of suspension system in certain frequency band is the fundamental cause of self-excited vibration. Secondly, the bridge subsystem is regarded as the forward passage of the whole coupling system. The suspension subsystem is regarded as the feedback channel of the coupling system, and the mechanism of the self-excited vibration is analyzed from the point of view of the characteristic polynomial of the coupling system, finally, according to the open loop transfer function of the system, The basic principle of self-excited vibration is analyzed by using stability criterion. Based on the above analysis, four effective conclusions are obtained, which provide a theoretical reference for understanding and solving the problem of self-excited vibration. The corresponding digital simulation analysis is carried out, and the simulation results verify the correctness of the conclusion.
【作者单位】：国防科学技术大学机电工程与自动化学院;近地面探测与感知技术重点实验室;
【基金】：国家科技支撑计划(2012BAG07B01) 国家自然科学基金项目(11302252)
【分类号】：U211;U441.7

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