【作者】 褚志刚；

【导师】 邓兆祥；

【作者基本信息】 重庆大学 ， 车辆工程， 2002， 硕士

【摘要】 随着道路条件的改善，汽车的行驶速度越来越高，对汽车的高速行驶性能也提出了越来越高的要求，某汽车在实际行驶时出现了转向轮高速摆振现象，传统的经典力学方法已无法满足复杂汽车系统的建模和精确求解。 本文以多体系统动力学理论和有限元分析技术为手段，应用多体动力学分析软件ADAMS、有限元分析软件ANSYS、三维造型软件UG建立了前悬架的多体运动学和动力学分析模型，进行了前轮定位参数的优化，完成了前悬架关键部件的结构设计。通过对动力学模型的仿真计算，发现车轮过大的偏心质量是导致摆振的主要原因。根据不同的横向稳定杆简化方法，得到了前悬架和转向系统的刚体动力学模型、离散动力学模型、模态集成动力学模型，比较了三种不同简化模型对分析结果的影响。计算了转向轮高速摆振随车速的变化规律，以及不同横向稳定杆直径下的前悬架和转向系动力学系统的固有特性和强迫振动响应，探讨了改变横向稳定杆直径对高速摆振的抑制能力。 利用本文的研究方法和理论，克服了传统古典力学方法无法处理的复杂汽车动力学系统的建模和求解问题，大大地提高了模型的动力学求解精度，具有重要的理论价值。通过本文的研究，一方面对前轮定位参数进行了优化设计；另一方面，找到了产生转向轮高速摆振的机理，为企业作进一步的改进指明了方向。因此本文又具有重大的实际意义和实用价值。更多还原

【Abstract】 With the improved condition of highway and the increase of vehicle speed, it is on rising for the high driving speed performance of vehicle caused by that. One kind of vehicle has steering wheel shimmy at high speed, while the traditional classical dynamic method can’t satisfy the requirement of complex vehicle system modeling and precise solution.This research bases on Multi-Body Dynamic theory and FEA, applies software ADAMS, ANSYS and UG to built the Multi-Body dynamic and kinetic model of front suspension system.optimized the coordinate coefficients of front wheels, finished the structure design of key components of front suspension. With the simulation calculation of dynamic model, it indicates the extra eccentric mass of wheel is the main reason for shimmy. Bases on different simplify of the stabilizer, the rigid dynamic model, discrete dynamic model and mode integrated model of the front suspension and steering system are built. The effects to the analysis result of the three models are compared. The research calculates the varied law of steering wheel shimmy with the vehicle speed, the inherence characteristic and force vibration response of the front suspension and steering system in different stabilizer diameters, discusses the restrain capability of vary the stabilizer diameter to shimmy.Utilize the method and theory in this research, it overcomes the problem of the traditional classical dynamic method can’t handle the complex vehicle system modeling and solution. Greatly improve the solution precise, it has important theoretic value. Furthermore through this research it optimizes the design of front wheels’ coordinate coefficients and finds the principle reason of the shimmy, guides the manufacturer’s improvements. So this study has great realistic significance and value too.更多还原