【作者】 陈晓新；

【导师】 陈无畏；

【作者基本信息】 合肥工业大学 ， 车辆工程， 2010， 硕士

【摘要】 本文是结合“国家863计划”项目子课题——“整车NVH控制技术”进行的研究。汽车的NVH性能,作为重要的法规和竞争指标在当今汽车产品竞争中变得举足轻重。悬架作为底盘以及整车的一个重要子系统,能够缓和冲击和吸收来自车轮的能量。悬架系统的几何结构、刚度、阻尼、橡胶衬套等参数对悬架的隔振性能以及整车的乘坐舒适性有着极其重要的作用。随着计算机技术和数值分析理论的发展,CAE技术在现代汽车产品设计中扮演着越来越重要的角色。为了在汽车隔振设计时充分考虑悬架系统的作用,本文将有限元方法和多体动力学虚拟样机仿真技术相结合,研究悬架系统结构特征和力学参数对整车振动的影响。先对组成悬架系统的各主要结构件进行模态分析,获得其固有振动特性。同时,在虚拟样机软件ADAMS/Car中建立了整车的各主要子系统,包括前后悬架、转向、轮胎、车身、动力总成等,并利用有限元分析生成柔性体的方法,建立了整车刚柔耦合动力学模型,以提高建模精度。其次,本文从悬架系统的隔振性能角度考虑,在ADAMS软件中编写了计算加权加速度均方根值的函数,对整车模型进行了动力学仿真分析。在此基础上利用试验优化的方法优化匹配了前后悬架系统的弹簧刚度和减振器阻尼参数,将匹配结果导入模型进行重新仿真,使得悬架系统的隔振性能得到一定程度的改善。最后,针对橡胶衬套的柔性连接作用和作为汽车设计后期少数几个可以修改的设计参数,利用有限元法分析橡胶衬套的刚度特性,结合DOE技术对悬架系统中几个主要橡胶衬套的刚度进行灵敏度分析,对其中影响较大的衬套刚度进行优化匹配,为改善整车的隔振性能提供指导。更多还原

【Abstract】 This dissertation was studied in the background of program of“Vehicle NVH Control”, which is one sub program of“National 863 Project”. Vehicle NVH performance, as an important indicator of regulation and factor of competition, has became more and more important in today’s vehicle products. As a major component of vehicle, the suspension system can ease the impact and absorb the energy from the wheels. The geometry characteristics, stiffness, damping, rubber bushings of suspension are all extremely important roles in suspension vibration isolation and ride comfort of a vehicle.With the development of computer technology and numeric analysis theories, CAE technology plays an increasingly important role in the modern automotive product design. In order to consider the contribution from suspension to vehicle vibration isolation when designing a vehicle, this paper used finite element method and multi-body dynamics simulation of virtual prototyping technology to study the structural characteristics and parameters of suspension system on the impact of vehicle vibration. Firstly, normal mode analysis of some major structural components of suspension had been taken in order to obtain the vibration characteristic. Meanwhile, with the virtual prototype software ADAMS / Car, all subsystems, including the front/rear suspension, steering, tires, body, power train etc., were established. And then organize all subsystems to build a rigid-flexible coupled dynamics full vehicle model to improve the modeling accuracy.Secondly, dynamics simulation was taken to analysis the vibration isolation performance of suspension system in this paper, and a function to calculate the RMS of acceleration values was also written. On basis of above, using experimental optimization method to optimized the front and rear suspension stiffness and damping parameters of the suspension system, which resulted in improvement of suspension vibration isolation performance.Finally, consider rubber bushings to be the few parameters can be modified and their flexible connection function, using the FEM to analysis stiffness characteristics of rubber bushing and making sensitivity analysis of their contributions to vibration, to optimize the stiffness of some important rubber bushings, in order to provide guidance to improve vehicle vibration isolation.更多还原