基于刚柔耦合仿真的集装箱车体振动疲劳分析  

Vibration fatigue analysis of a container flatcar based on rigid-flexible coupling simulation

作　　者：朴明伟[1] 方吉[1] 赵钦旭[1] 兆文忠[1] 

机构地区：[1]大连交通大学机械工程学院,大连116028

出　　处：《振动与冲击》2009年第3期1-5,共5页Journal of Vibration and Shock

基　　金：国家863高科技资助项目(编号:2006AA04Z160);辽宁省教育厅2007年创新团队项目(编号:2007T013)

摘　　要：为了分析结构振动对疲劳寿命的影响程度,提出了一种基于刚柔耦合仿真的振动疲劳分析方法。利用柔性体接口处理技术对策(ITTS),建立刚柔耦合系统模型,其中,柔性体在动约束作用下能够形成具有相关模态振动特征的弹性振动。应用基于子结构模态综合法(CMS)的动应力恢复方式,进行危险点动应力与模态振动的相关性分析和动应力变化的幅频统计对比,以确定疲劳性质及振动影响程度。结合集装箱平车垂向加速度偏大问题,利用两种柔性车体模型:模态质量和附着质量车体模型,确定了车体在斜楔摩擦粘-滑振动作用下形成了具有2阶垂向弯曲模态振动特征的弹性振动。根据危险点动应力的模态相关性分析和幅频统计对比,集装箱地脚的垂向纵向约束力是造成大幅值循环应力出现的主要原因之一,而结构振动对疲劳寿命的影响程度约为(20-25)%。In order to analysis influence level of structural vibration on fatigue life,a methodology of vibration fatigue analysis was presented based on rigid-flexible coupling simulation.With Interface Transaction Technical Strategy(ITTS) for a flex-body,the model of a rigid-flexible coupling system was established,in which the flex-body can produce the elastic vibration characterized by the relevant modal vibrations under dynamical constraint interactions.By Component Modal Synthesis(CMS) approach of stress recovery,the following analyses were carried out to determine fatigue quality and influence level of vibration: the correlation between dynamical stress and modal vibration,and the stress range histograms by which the amplitude and cycle number of stress of critcal points were contrasted statistically among multi-condition.For vertical vibration problem of a container flatcar,for instance,higher vertical acceleration,it was sured that under dynamical interaction of wedge's stick-slip friction,the flatcar produces an elastic vibration characterized by the 2nd vertical bending mode,which can be validated by a modal mass model and an attached mass one of the flatcar.According to the modal correlation analysis and the statistical contrast of stress range histogram for the cycle stress of crotical points,the vertical and lateral constraint forces of the container feets were the main causes of the large amplitude of the cycle stress of critcal points,and the influence level of structural vibration on fatigue life was up to(20-25)%.

关 键 词：振动疲劳 刚柔耦合 应力恢复 集装箱平车 

分 类 号：U270[机械工程—车辆工程] U272.6[交通运输工程—载运工具运用工程]