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为研究地震下高速列车的动态响应及地震波频谱特性对车辆动态脱轨行为的影响,发展了一种地震激励下车辆/轨道耦合动力学数值模型,车辆模型被简化为考虑悬挂非线性特性的35自由度多刚体系统,板式轨道被视为由钢轨、扣件系统、轨道板及CA砂浆层组成的弹性支承结构,钢轨被视为连续弹性离散点支承基础上的Timoshenko梁,轨道板用三维实体有限元模拟。采用移动轨下支承模型分析离散的轨枕支承对系统动力响应的影响,地震波被简化为周期性的横向正弦波加入计算模型中。基于仿真计算,对地震情况下高速列车的动力响应进行了详细分析,并重点分析了地震波频谱特性对高速车辆动态脱轨机理的影响。分析结果表明:地震波的频谱特性对车辆的动态响应、脱轨机理及车辆的运行安全有着重要的影响。
In order to study the dynamic response of high-speed trains and the influence of seismic wave spectrum characteristics on the dynamic derailment behavior of vehicles under earthquake, a numerical model of vehicle / track coupling dynamics under earthquake excitation is developed. The vehicle model is simplified to 35 free-wheeling For multi-rigid systems, the slab track is considered as an elastic support structure composed of rail, fastener system, track plate and CA mortar layer. The rail is regarded as a Timoshenko beam based on continuous elastic discrete point support. Metamodel. The influence of discrete sleeper support on the dynamic response of the system is analyzed by using the mobile-rail support model. The seismic wave is simplified into a periodic transverse sine wave model. Based on the simulation calculation, the dynamic response of high-speed trains under earthquake conditions is analyzed in detail, and the influence of seismic spectrum characteristics on the dynamic derailment mechanism of high-speed vehicles is analyzed. The analysis results show that the spectral characteristics of seismic waves have an important influence on the dynamic response of the vehicle, the derailment mechanism and the running safety of the vehicle.