车辆可靠性.doc

基于能量分布的轨道车辆动力学系统可靠性分析 郑明亮 (浙江理工大学 杭州 310018） 摘要：为研究轨道车辆随机振动系统动力可靠性，根据分析动力学中的Hamilton正则方程，建立考虑轨道不平顺与结构自身参数随机因素共同作用的车轨悬挂2自由度复合随机振动模型。将系统的广义能量停留在安全域内的概率作为动力可靠性指标，运用拟不可积Hamilton系统随机平均法，求出系统动力响应Hamilton函数幅值的均值和方差。依据顺序统计理论和随机变量函数的矩法求出系统动力可靠度的均值和方差的计算公式。通过算例，分析轨道轨道不平顺和车辆物理参数的随机性对系统动力可靠度随机性的影响，为系统结构参数优化设计和最优控制策略等奠定基础，对保证高速列车更安全平稳运行提供参考。 关键字：轨道车辆；Hamilton；均值和方差；动力可靠性 Reliability analysis of railway vehicle dynamics system based on energy distribution Zheng Ming Liang (Zhejiang Sci-Tech University, Hangzhou 310018) Abstract:In order to study the dynamic reliability of the random vibration system of the track vehicle, the random vibration model of the 2 degree of freedom of the vehicle rail suspension is established by considering the random factors of the track irregularity and the structural parameters. The generalized energy of the system is used as a dynamic reliability index, and the mean and variance of the amplitude of the system is obtained by using the stochastic averaging method of the Hamilton system. The calculation formula of the mean and variance of the system dynamic reliability based on the order statistics theory and the moment method of the random variable function. Effects of random through examples and analysis of track irregularity and vehicle physical parameters of the power system reliability degree of randomness, as the system structure parameters optimization design and optimal control strategy to lay a foundation, to ensure the high speed train more safe and stable operation of the reference. Key words:Rail vehicles; Hamilton; mean and variance; dynamic reliability 0引言： 随着当前我国高速铁路和城市轨道交通的快速发展，车辆行驶安全可靠性是现代高速列车选择的基本指标之一，高速轨道车辆重载运行时，轮轨间作用力突增，车辆悬挂系统的垂向受迫振动加剧，当系统振动能量达到储存极限时，系统可靠性会被破坏，车辆发生首次穿越脱轨失效，严重会造成重大伤亡事故。因此，有必要对高速列车的可靠性展开深入研究，而车辆系统的参数分析对于改善其可靠性具有重要参考价值。目前轨道车辆系统的研究主要集中在列车-轨道各结构件的合理力学模型、系统耦合动力学方程的推导和高效数值计算方法以及应用虚拟样机的CAE技术建模来研究系统的性能动力学仿真计算，如ADAMs/Rail建模、SIMPACK建模、DADS、以及软件联合建模等。翟婉明[1]完成了