转向架构架模态频率与疲劳损伤参数敏感性研究

doi:10.3901/JME.2018.04.264

机械工程学报 ›› 2018, Vol. 54 ›› Issue (4): 264-269.doi: 10.3901/JME.2018.04.264

转向架构架模态频率与疲劳损伤参数敏感性研究

李国栋, 王建斌, 曾京

西南交通大学牵引动力国家重点实验室成都 610031

收稿日期:2017-10-07 修回日期:2018-01-04 发布日期:2018-02-20
作者简介:李国栋,男,1975年出生,博士研究生,教授级高级工程师。主要研究方向为转向架设计、动力学与强度。E-mail:lgdcrc@163.com
基金资助:
国家自然科学基金（51205325）和四川省应用基础计划（2014JY0057）资助项目

Parametric Sensitivity Study on Modal Frequency Respect to Fatigue Damage of Bogie Frame

LI Guodong, WANG Jianbin, ZENG Jing

The Stake Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031

Received:2017-10-07 Revised:2018-01-04 Published:2018-02-20

摘要/Abstract

摘要： 转向架构架是车辆走行部主要承载结构，结构的疲劳强度可靠性是核心的设计指标。根据受力分析，构架弹性变形的载荷来自车体振动与轨道不平顺导致的超静定扭曲支撑。基于模态柔性并通过刚柔耦合车辆动力学仿真，分析车辆典型运行状态下构架模态参与系数；构架一阶扭转模态振动响应是构架变形的主要贡献量，且造成了横侧梁连接位置较大应力水平及损伤量；由于构架结构型式为H形，抽象了一种变扭转刚度的构架模型，通过改变耦合扭转刚度来改变构架扭转自振频率。通过惯性释放的准静态叠加法，分析扭转频率从0 Hz到45 Hz下构架不同位置的损伤量。侧梁各位置随着频率增加损伤量增大而横侧梁连接位置则随之降低且敏感性更强。确定了主变形条件下的等刚度设计原则，构架设计应提高横侧梁连接位置刚度。

关键词: 变扭转刚度, 结构模态, 疲劳损伤, 转向架构架

Abstract: Bogie frame is the main loaded part on running gear. Fatigue strength and reliability of the frame structure are kernel objects in structural design. According to the loading analysis, vehicle body vibration loads and torsion supporting induced by track irregularities contribute mostly to the elastic deformations of the frame. Modal participant coefficients are analyzed by rigid-flexible coupling dynamic simulations based on modal flexibility method. The first modal vibration response is main contributor to the elastic deformation of the frame which also induce high stress levels and fatigue damages at connections of side and transverse beams. As H shape is common to bogie structural pattern, an abstract model of variant torsion stiffness is derived for parameter study on the relations of modal frequency and fatigue damage. Torsion frequency is variant from 0 Hz to 45 Hz by changing torsion spring stiffness and dynamic stresses and fatigue damages are simulated by quai-static superposition with inertia relief method. It is found that fatigue damages at connection locations are decreased with increased torsion frequency and the parameter sensitivity is larger than other areas. It is recommended that within the mass constraints, the torsion modal frequency should be increased for more smooth stiffness distributions.

Key words: bogie frame, fatigue damage, structural modal, variable torsion stiffness

中图分类号:

U260

李国栋, 王建斌, 曾京. 转向架构架模态频率与疲劳损伤参数敏感性研究[J]. 机械工程学报, 2018, 54(4): 264-269.

LI Guodong, WANG Jianbin, ZENG Jing. Parametric Sensitivity Study on Modal Frequency Respect to Fatigue Damage of Bogie Frame[J]. Journal of Mechanical Engineering, 2018, 54(4): 264-269.

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转向架构架模态频率与疲劳损伤参数敏感性研究

Parametric Sensitivity Study on Modal Frequency Respect to Fatigue Damage of Bogie Frame

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