轨道车辆平稳性的随机参数全局灵敏度分析-车辆工程专业论文.docxVIP

I I 轨道车辆平稳性的随机参数全局灵敏度分析 中文摘要 轨道车辆平稳性的随机参数全局灵敏度分析 中文摘要 轨道交通运输以其迅速、便利、经济、环保、安全性强等优点，成为现代社会重 要的交通工具。世界各国都在积极发展轨道交通事业，我国也加快了建设高速铁路和 城市轨道交通的步伐。然而，列车高速重载运行时，轮轨间作用力加剧，车辆运行平 稳性下降。因此，有必要对高速列车的平稳性展开深入研究，而车辆系统的参数分析 对于改善其平稳性具有重要参考价值。本文主要研究内容及工作如下： (1) 建立了基于广义 Ruzicka 隔振系统的轨道车辆垂向多刚体动力学模型。采用 复模态分析法获得车辆系统的模态参数及振型。基于虚拟激励法快速求解轨道随机不 平顺作用下的车辆系统随机振动响应功率谱和垂向平稳性指标。对比经典的 10 自由 度车辆垂向模型，分析了阻尼器橡胶节点刚度变化对振动响应特性和平稳性指标的影响。 (2) 考虑部分车辆系统参数的高斯模型不确定性，采用随机模拟方法分别获得单 参数和多参数变异时，垂向 Sperling 平稳性指标的均值、标准差及变异系数，并估计 出 Sperling 指标的概率取值范围。 (3) 对于具有随机参数结构的轨道车辆模型，采用傅里叶幅值灵敏度检验扩展法 分析了 Sperling 指标关于随机悬挂参数的全局灵敏度，并且结合 Sperling 指标样本与 悬挂参数样本之间的相关系数讨论了傅里叶幅值灵敏度检验扩展法的分析效果。 本文的研究工作为轨道车辆动力学性能的可靠性分析和稳健设计提供有价值的 参考依据。 关键词：轨道车辆，随机参数，虚拟激励法，平稳性，全局灵敏度 作 者：余衍然 指导老师：李 成 副教授 Abstract The Global Sensitivity Analysis on Ride Quality of Railway Vehicle with Stochastic Parameters The Global Sensitivity Analysis on Ride Quality of Railway Vehicle with Stochastic Parameters Abstract With its advantages, such as speediness, convenience, economic, environmental protection, high safety etc, railway transportation has become an important mean of transport in modern society. At present, rail transit enterprises are developed actively over countries. The construction of high-speed railway and urban rail transit is also speeding up in our country. However, when an overloaded train runs in high speed, wheel/rail interaction forces will be aggravated, the ride quality of vehicle declines. Therefore, it is necessary to study the ride quality of high-speed vehicle in deepth, and the analysis of vehicle system parameters has an important reference value to improve its ride quality. This article’s main research content and work are as follows: A vertical multi-rigid-body dynamics model of railway vehicle based on generalized Ruzicka vibration isolation system is established. The complex modal analysis method is adopted to obtain the modal parameters and inherent vibration modes of vehicle system. Under the action of random track irregularities, the ra