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为保证高速列车车下设备结构的安全性,基于振动响应容限仿真计算方法和米塞斯应力屈服准则,运用有限元仿真模型对线性和非线性悬挂刚度下高速列车牵引变压器的振动响应容限进行研究。对牵引变压器沿纵向、横向、垂向同时加载,得到响应应力最大的危险节点。对牵引变压器分别沿纵向、横向、垂向进行加载,得到危险节点的6个应力分量和不同方向振幅的关系,并基于叠加原理,得到纵向、横向、垂向同时加载下危险节点应力分量和不同方向振幅的关系。基于求得的米塞斯应力函数与米塞斯应力屈服准则,得到振动响应容限。分析结果表明:基于叠加原理,可以运用MATLAB替代ANSYS对线性悬挂刚度下的振动响应容限进行仿真计算;线性与非线性悬挂刚度下的振动响应容限曲面间存在一条垂向位移等值曲线,当横向位移与纵向位移组成的坐标点位于垂向位移等值曲线在平面内的投影线以下时,线性悬挂刚度下垂向位移的振动响应容限比相应非线性悬挂刚度下的振动响应容限大,当横向位移与纵向位移组成的坐标点位于垂向位移等值曲线在平面内的投影线以上时,线性悬挂刚度下垂向位移的振动响应容限比相应非线性悬挂刚度下的振动响应容限小。
In order to ensure the safety of equipment structure under high-speed trains, based on the calculation method of vibration response tolerance and the Mises stress yield criterion, the finite element simulation model is applied to the vibration response of high-speed train traction transformers with linear and nonlinear suspension stiffness research. Towards the traction transformer along the vertical, horizontal, vertical load at the same time, get the maximum response stress dangerous node. The traction transformer is loaded in the longitudinal, transverse and vertical directions, respectively, and the relationship between the six stress components and the amplitude of the different directions is obtained. Based on the superposition principle, the stress components of the dangerous nodes under different longitudinal, transverse and vertical loadings are obtained. The relationship between the amplitude of the direction. Based on the obtained Mises stress function and Mises stress yield criterion, the vibration response tolerance is obtained. The analysis results show that based on the principle of superposition, MATLAB can be used instead of ANSYS to simulate the vibration response tolerance under linear suspension stiffness. There is a vertical displacement equivalent curve between the vibration response and the limit surface under linear and nonlinear suspension stiffness, When the coordinate point composed of lateral displacement and longitudinal displacement is below the projection line of the vertical displacement equivalent curve in the plane, the vibration response tolerance of vertical displacement under linear suspension stiffness is larger than the vibration response tolerance under corresponding nonlinear suspension stiffness , When the coordinate point composed of lateral displacement and longitudinal displacement is located above the projection line of the vertical displacement equivalent curve in the plane, the vibration response tolerance of vertical displacement under linear suspension stiffness is higher than the vibration response tolerance under corresponding nonlinear suspension stiffness small.