砾石冲击下动车组裙板的变形影响因素分析

Study of Deformation Factors for Electric Multiple Unit Skirt Boards under Impact of Ballast

为分析砾石冲击动车组裙板过程中的砾石粒子粒径、冲击速度和冲击角度这三个影响冲击变形的因素,得到对变形的影响规律,本文采用空气炮砾石冲击试验装置和非线性瞬时动力学软件LS-DYNA,研究砾石的粒径等级、冲击速度、冲击角度对动车组裙板的冲击变形规律。研究结果表明:裙板的变形程度与粒径、冲击速度和冲击角度之间有着不同的函数关系。裙板冲击点最大位移以及凹坑深度与砾石粒径之间存在幂函数关系,与冲击速度之间存在一次线性关系,与冲击角度之间存在二次线性关系。本文研究为高速动车组设备舱裙板结构后续设计提供了理论依据。

In order to analyze the three factors that affect the impact deformation of gravel particle size,impact velocity and impact angle during the process of gravel impacting the skirt board structure of EMU and to obtain the influence rule of deformation,this paper used the method of high-speed impact air gun test apparatus and nonlinear transient dynamics software LS-DYNA,to study the damage of skirt boards subjected to the impact of ballast balls with different sizes,impact velocities and angles.The results show that a different function relationship exists between the deformation degree of the skirt boards,the particle size,the impact velocity and the impact angle.The relationship between the maximum displacement,the pit depth of the impact point and the diameter of the ballast particle is of power function.The relationship between impact velocities is linear.The relationship between impact angles is secondary linear.This paper provides a certain theoretical basis for the design of the skirt board structure of the equipment cabin of EMU.