极端工况下列车结构的复杂非线性动力学和疲劳寿命

项目名称： 极端工况下列车结构的复杂非线性动力学和疲劳寿命

项目编号： No.11502161

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 钟顺

作者单位： 天津大学

项目金额： 22万元

中文摘要： 铁路（轨道运输）是重要的科学研究课题。列车的高速化、重载化，以及行驶自然环境的多样化是当今轨道运输发展的趋势，伴随着这些极端工况，列车结构在行驶过程中必将产生新的复杂的非线性动力学行为，这是本课题所关注的主要问题。同时，利用极端工况下的复杂非线性动力学行为进行疲劳寿命评估和可靠性分析关系到列车和乘客的安全，也是十分重要和必要的。. 本课题拟引入列车结构在极端工况下的多种复杂非线性因素，采用定性分析与定量计算的综合集成方法，通过对列车结构的非线性动力学建模，分析可能产生的新的复杂的非线性动力学行为（特别是全局动力学行为）及产生机理；在非线性动力学层面上开展疲劳寿命的研究；利用定性分析结果构建列车关键部位仿真实验平台。旨在为列车结构非线性动力学分析和疲劳寿命预测提供高科技支持，为参数分析和优化设计提供理论依据。

中文关键词： 非线性模型；多自由度；疲劳寿命；极端工况；耦合系统动力学

英文摘要： Railway (Rail transport) is an important scientific issue. High-speed, heavy-haul and the diversification of the natural environments are the development trends of the rail transportation. Along with these extreme conditions, there result in some new complicated nonlinear dynamic behaviors of the vehicle structure, which will be the main issue of this project. Meanwhile, the fatigue life and the reliability assessment related to the security of the vehicle and the passengers are also important..In this research, we intend to clarify the complicated nonlinear factors of the vehicle structure under extreme conditions through the comprehensive methodology based upon both qualitative and quantitative analysis. According to the nonlinear modeling of the vehicle, the new complex nonlinear dynamics (especially the global dynamics) and their mechanisms are analyzed as well as the fatigue life. Also the simulation experiment platform will be built up by the results of the qualitative analysis. The achievements of this project will provide not only technical support for the nonlinear analysis and fatigue life prediction of the vehicle but also theoretical bases for the analysis and the optimization of the parameters.

英文关键词： Nonlinear Model;Mulit DOF;Fatigue-Life;Extreme Conditions;Dynamics of Coupled System