基于PSD方法的点焊轨道客车车体随机振动疲劳寿命分析  

The analysis of random vibration fatigue life of spot welding passenger car-body based on PSD method

作　　者：修瑞仙[1] 肖守讷[1] 阳光武[1] 刘艳文[1] 

机构地区：[1]西南交通大学 牵引动力国家重点实验室,四川成都610031

出　　处：《机械》2013年第8期27-31,56,共6页Machinery

基　　金：铁道部科技研究开发计划项目(2011J022-A);四川省科技计划项目(2011JY0029);中央高校基本科研业务费专项基金资助项目(SWJTU09ZT23);"十一五"国家科技支撑计划项目(2009BAG12A04-A11)

摘　　要：首先利用SIMPACK动力学软件得到车体二系簧处的加速度功率谱(PSD),在ANSYS中对车体二系簧座进行激励加载,利用模态叠加法对车体进行随机振动分析,得到客车车体的1σ应力分布;而后利用高斯三区间法和Miner线性累积损伤定律,对车体结构的疲劳寿命进行分析。分析结果表明,在达到车辆五级修程前,车体底架枕梁和边梁连接处、侧墙窗角立柱与蒙皮连接处及车顶空调安装梁与波纹板连接处为车体疲劳寿命薄弱位置。Firstly, from the dynamics software SIMPACK, we got the acceleration power spectral density （PSD） in the position of second springs; Then the PSD was loaded at car-body＇s second spring seats in the ANSYS software, the car-body＇s random vibration was analyzed using modal superposition method and we got the car-body＇s 1σ stress distribution; And Last using the Gaussian three interval method and Miner linear cumulative damage law, the car-body＇s fatigue life was analyzed. The results show that before the vehicle＇s 5 grade repairing, the car-body has been failed. The weak areas mainly include joint positions of pillow beam and side beam in under-frame, windows＇ angle column and skin in side-wall, air conditioning installation beam and corrugated plate in roof.

关 键 词：点焊客车 随机振动 疲劳寿命 功率谱密度 高斯三区间法 Miner线性累积损伤定律 

分 类 号：TB533.2[理学—物理]