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分析计算了列车运行引起环境振动的振源,即轨道作用于道床的振动加速度机制.建立了轮-轨-道床计算分析模型,将钢轨视为Winkler地基上无限长梁,建立并求解该梁的动力方程,得到列车移动静力产生的轨道振动加速度;根据Hertz接触理论,求得轮轨动接触力,利用Green函数模拟轨道因轨道不平顺和轮轨动接触力作用产生的变形,进而求得轨道不平顺和轮轨动接触力引起的轨道振动加速度;叠加上述两种加速度,即得列车引起环境振动的振源振动加速度;最后将理论计算结果和实测结果进行比较,吻合较好.
The vibration source of environment vibration caused by train operation is analyzed and calculated, that is, the vibration acceleration mechanism of orbital acting on track bed is established.The wheel-rail-track bed calculation and analysis model is established, the rail is regarded as infinite beam on Winkler foundation, Dynamic equation of the train to obtain the orbital vibration acceleration caused by the static movement of the train. According to the Hertz contact theory, the contact force of the wheel and the rail is obtained, and the Green function is used to simulate the deformation of the orbit due to the track irregularity and the contact force of the wheel and rail. Track irregularities and wheel-rail contact force caused by the orbital vibration acceleration; superposition of these two accelerations, the train was caused by environmental vibration vibration source vibration acceleration; and finally the theoretical calculation results and the measured results were compared with good agreement.