【作者】 林蔚；

【导师】 邓兆祥；

【作者基本信息】 重庆大学 ， 车辆工程， 2004， 硕士

【摘要】 随着多体动力学技术的发展和计算机应用水平的不断提高,使得利用多体动力学原理进行产品整机虚拟样机设计成为可能。作为重庆乃至全国传统支柱企业的摩托车企业在新产品设计中虽然也广泛应用了如Cax技术的现代设计技术,但是在利用多体动力学原理对整车进行系统设计和优化方面与日本及欧洲著名摩托车生产企业相比仍然十分落后。如何利用多体动力学原理建立摩托车整车的虚拟样机并应用于系统的设计和优化,已成为我国摩托车企业感兴趣的问题。本文利用大型商用多体动力学软件ADAMS(Automatic Dynamic Analysis of Mechanical System)和有限元分析软件ANSYS建立了某中排量越野摩托车的多体动力学模型,并建立了包含轮胎-路面在内的真实工作环境,模拟了摩托车实际使用工况下的行驶和制动过程,分析了行驶平顺性、舒适性和制动安全性等指标。并根据样机虚拟实验的结果进行了发动机悬置的结构优化工作;讨论了悬架参数对摩托车固有特性的影响,并由此总结出制动过程摩托车驾乘舒适性与悬架参数之间的关系。本文在摩托车虚拟样机的建立方面进行了多种尝试,提出了建立多体样机的不同方法并进行了比较。认为在以摩托车整车固有特性研究以及摩托车行驶状态研究为研究目的时,多刚体样机的仿真结果和多柔体样机的仿真结果没有大的区别,所以结合当前摩托车生产企业的计算机装备水平和多体动力学技术的应用水平,本文认为采用多刚体动力学样机进行仿真实验是现阶段在摩托车企业切实可行的设计方法。更多还原

【Abstract】 With the development of the multi-body-dynamics and the widely use of computer, it enabled the virtual prototype to be developed for entire machine. The motor industry, as a key industry in our country, has widely employed Cax techniques during the products designing period, but the use of multi-body-dynamics technique is drop behind the developed countries such as Japan and some of the Europe countries. How to develop a virtual-motor-prototype via multi-dynamic technique is much more interests Chinese motorcycle factories.This paper built an off-road virtual-motor-prototype via ADAMS and ANSYS system. Included tire and road surroundings, the prototype could be simulated for driving and braking operation. With the result of the virtual experiments, this paper also evaluated the harshness, vibration and braking security of the prototype. Further, this paper designed a new style of engine mounting to reduce the vibration generated by engine inertial and explored the natural characters influence of the suspension parameters. With the conclusion of suspension parameter would influence the natural characters of the motorcycle, this paper also discussed the relationship between the suspension parameters and the braking vibration.This paper tried to build up the virtual-motor-prototype via different methods and compared the results of those different models. When virtual prototype built for harshness and braking security experiment, there is no obvious different amount those prototypes. Since the weak of computer equipment and the multi-body-dynamics techniques use level in Chinese motor industries, multi-rigid-body virtual prototype is a reasonable design method for current Chinese motor factory.更多还原