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确定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。
In order to study the dynamic reliability of the random vibration for railway vehicle,the random vibration model of vehicle rail suspension with two-degree of freedoms is established by considering the random factors of the track irregularity and the structural parameters.The generalized energy is used as a dynamic reliability index,and the mean and variance of the amplitude is obtained by using the stochastic averaging method for Hamilton system.The calculation formula of the mean and variance of dynamic reliability is obtained based on the order statistics theory and the moment method.Through an example,the influence of track irregularity and the randomness of physical parameters on the randomness of dynamic reliability is analyzed,which lays a foundation for the optimization design of structural parameters and the optimal control strategy,and provides a reference for ensuring the safe and stable operation of high-speed trains.
作者
郑明亮
冯鲜
杨德云
ZHENG Ming-liang;FENG Xian;YANG De-yun(School of Mechanical and Electrical Engineering,Taihu University of Wuxi,Wuxi 214064)
出处
《机械设计》
CSCD
北大核心
2019年第A01期176-179,共4页
Journal of Machine Design
基金
江苏省高等学校自然科学基金资助项目(18KJB460027)
