动车牵引变压器冷却单元模态与冲击性能分析

Analysis of Modal and Impact Performance of Cooling Unit of Traction Transformer of EMU

为了研究某型动车组牵引变压器冷却单元抗破坏特性,本文以其冷却单元为研究对象,依据IEC61373-2010标准确立冷却单元的载荷工况,采用有限元方法进行模态分析、冲击强度研究,重点分析在不同冲击载荷作用下冷却单元的应力分布情况,并通过实验验证冷却单元抗破坏能力。研究结果表明:通过对冷却单元模态计算,冷却单元结构的底板和架线梁伸出端等处的刚度较小,导致局部出现摆动和变形;在三个方向冲击载荷作用下,冷却单元最大应力位于右垂直支撑梁与底板连接处,最大应力值为282.52MPa,小于其材料的许用应力,更小于其材料的屈服强度,未发生失效破坏;对牵引变压器冷却单元进行冲击实验,实验结果表明冷却单元未发生失效破坏,验证了有限元分析结果的有效性。鲜有研究学者对牵引变压器冷却单元进行失效研究,本文分析冷却单元整体结构,使牵引变压器冷却单元的研究更加全面,为其失效研究提供一定的参考。

In order to study the anti-destructive characteristics of the cooling unit of the traction transformer of a certain type of an EMU,this article takes its cooling unit as the research object,establishes the load condition of the cooling unit according to the IEC61373-2010 standard.Use finite element method for modal analysis and impact strength research,focusing on the analysis of the stress distribution of the cooling unit under different impact loads,and verifies the anti-destructive ability of the cooling unit through experiments.The results of the study are as follows:through the modal calculation of the cooling unit,the rigidity of the bottom plate of the cooling unit structure and the extension end of the string beam is small,which leads to local swing and deformation;under the action of three directions impact load,the largest stress of cooling unit is located at the junction of the right vertical support beam and the bottom plate,and the maximum stress value is 282.52 MPa,which is less than the allowable stress of the material,and even less than the yield strength of the material,and no failure or failure occurs;the impact test on the cooling unit of the traction transformer,the experimental results it shows that the cooling unit has no failure and damage,which verifies the validity of the finite element analysis results.Few researchers have conducted failure research on the cooling unit of traction transformer.This article analyzes the overall structure of the cooling unit to make the research on the cooling unit of the traction transformer more comprehensive and provide a certain reference for its failure research.