不平路面激励下三轴重型车辆非线性动力学与疲劳寿命评估研究

项目名称： 不平路面激励下三轴重型车辆非线性动力学与疲劳寿命评估研究

项目编号： No.11272220

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 冯国胜

作者单位： 石家庄铁道大学

项目金额： 82万元

中文摘要： 随着铁路、公路建设的飞速发展和西部开发战略的实施，非公路三轴重型车辆越来越多,我国生产的该类车辆的关键部件（如车架和推力杆）故障率高，整车可靠性低。本项目拟通过非线性动力学理论、多体动力学理论、数值仿真和动态特性实验，建立考虑钢板弹簧、平衡悬架、液压减振器、轮胎和发动机支撑的三轴重型车的三向（垂向、侧向和纵向）耦合非线性动力学整车模型，明确车辆在非公路工况(不平路面激励)下的非线性响应与车辆部件失效的关系，建立该类车辆的虚拟样机模型，揭示非线性元件对车辆平顺性、操纵稳定性和制动性的影响规律；采用非线性整车多体系统与有限元分析相结合的方法建立车架和推力杆的刚-弹耦合体模型，获取复杂工况下部件的动态应力，提出车辆疲劳寿命评估方法。本项目的研究可以拓展车辆动力学的研究内容，丰富高维非线性系统的动力学研究方法，也为解决其他车辆的可靠性设计问题提供理论指导，具有重要的理论意义和工程应用价值。

中文关键词： 三轴重型车辆；非线性动力学；疲劳寿命；不平路面激励；数值仿真

英文摘要： As rapid development of railway and highway along with the implementation of west region development strategy, these off-highway three-axle heavy vehicles are seen more and more popular. Some key components like vehicle frame and push-rod manufactured domestically show a high fault rate and thus are not reliable. This research program is expected to build up a nonlinear three-axle heavy vehicle model including leaf spring, balanced suspension, hydraulic shock absorber, tires and engine mount support and considering coupling among three directions( vertical, lateral, longitudinal) by means of nonlinear dynamics, multi-body dynamics, numerical simulations and experiments. Examine and reveal how nonlinear responses of a vehicle operated on uneven road surface influencing failure of vehicle components. Virtual model will be created for such types of vehicle and how non-linearly behaved components is responsible to vehicle's ride performance, handling stability and brake performance will be examined. Create vehicle frame and push- rod model using both rigid body and elastic deformable body mechanics by adopting nonlinear whole vehicle multi-body system combined with finite element analysis, calculate stress distribution of some components under variant loading conditions and propose systematic methods to evaluate veh

英文关键词： three-axle heavy vehicle；nonlinear；fatigue life；road undulation excitation；numerical simulation