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建立了某高速列车车体有限元模型,采用Guyan缩减进行模态求解,结合SIMPACK多体动力学软件建立包含弹性车体的系统动力学模型。运用模型分析了车体弹性模态对运行平稳性的影响,研究了弹性车体与转向架构架垂向耦合振动。分析结果表明:当车体垂向一阶弯曲频率与车体点头振动空响应点频率接近时,会发生车体的垂向弹性共振;当车体菱形变形弯曲频率高于9 Hz,垂向一阶弯曲频率高于10 Hz时,车体弹性对运行平稳性影响不大;该高速列车转向架一系悬挂垂向刚度与车体垂向一阶弯曲频率匹配合适,即使构架浮沉及点头频率与车体垂向一阶弯曲频率接近,也不会发生弹性车体与构架的共振现象。
A finite element model of a high-speed train body was established. Guyan reduction was used to solve the model. Combined with SIMPACK multi-body dynamics software, a system dynamics model including elastic body was established. The effect of vehicle body elastic modal on the running stability is analyzed by using the model, and the vertical coupling vibration between the elastic body and the bogie frame is studied. The analysis results show that the vertical elastic resonance of the vehicle body occurs when the vertical bending frequency of the vehicle body is close to the frequency of the empty response point of the vehicle body vibration. When the diamond bending deformation frequency of the vehicle body is higher than 9 Hz and the vertical one When the bending frequency is higher than 10 Hz, the body elasticity has little effect on the running stability. The vertical stiffness of the first-line suspension of the high-speed train bogies matches the first-order bending frequency of the vehicle body properly. Even if the frame floating and nodding frequency and The first-order bending frequency of the car body is close, and the resonance phenomenon of the elastic car body and the frame will not occur.