【作者】 李明兵；

【导师】 陈立平；

【作者基本信息】 华中科技大学 ， 机械设计及理论， 2006， 硕士

【摘要】 操纵稳定性、平顺性是汽车的重要动态性能,是汽车设计中的关键技术问题。数字化虚拟样机技术是缩短车辆研发周期、降低开发成本、提高产品设计和制造质量的重要途径,是汽车企业的一项关键核心技术。本文以ADAMS软件为二次开发平台,建立了双轴转向8×4载重车非线性多体动力学仿真分析系统。该分析系统实现了以下三大功能:对双轴转向8×4载重车整车模型的参数化自动建模功能;按照国标试验工况的自动仿真分析功能;以及符合汽车评价标准的仿真结果数据后处理功能。在该系统的建模过程中考虑了车辆的众多细节,各种设计参数可以在模型中得到体现;考虑了前后悬架、转向系统的详细几何结构参数;钢板弹簧由离散梁单元建模,充分体现钢板弹簧的非线性特点;并考虑了减振器的阻尼以及连接处的橡胶衬套的非线性特点,用户可以直接输入试验获取的非线性特性曲线。这样,汽车设计师面对的只是汽车本身的结构参数和相对应的性能参数,只需花较少的精力就可完成整车的建模、仿真分析,最终得到汽车相关的性能参数。从而提高了汽车设计的效率,降低了汽车设计的成本。应用开发的专用系统,本文进行了国内某公司的双轴转向8×4载重车的建模以及操纵稳定性、平顺性等方面的整车动力学仿真,并对该车操纵稳定性、平顺性性能进行了分析评价。同时,针对该公司轮胎磨损严重的问题,对转向系进行了参数优化,实车试验验证了优化结果的正确性。更多还原

【Abstract】 The handling and ride are the important dynamics performances of vehicle. And these performances are the key performances in the vehicle design process. The virtual prototyping is an importance approach to reduce the cost of real prototyping design and manufacture and to improve the design level and manufacture quality, which is a key technology of the vehicle corporation.In the thesis, the corresponding dynamic simulation system is developed based on the redevelopment of the ADAMS software. The system has three functions, automatic parametric modeling, automatic simulation according to national experimentation standard, and post-process of the results in accord with the motor evaluation standard. Many details have been considered and different parameters can be demonstrated in the model . The detailed geometric structural parameters of the front and rear suspensions, steering system etc . are considered. According to the real connection of parts, the leaf-springs are modeled as beam elements, which can fully reflect their nonlinear characteristic. Considered their nonlinear characteristic , the damper and rubber bushing are built as nonlinear filed elements by the experiments. Accordingly, it is only the structure parameter of the automobiles and the corresponding performance parameter that the automobile designers face. So designers could spend lilttle energy in modeling, simulation and getting the performance parameter, which can enhance the automobile design efficiency and reduce the automobile design cost. Based on the national standards, we simulate the vehicle dynamics performance about handling and ride in our system . According the dynamics simulation results, the handling and ride performances of vehicle are evaluated. At the same time, the parameter of the steering system is optimized in this thesis, and the results of the vehicle experiments have proved the validation of the optimized result.更多还原