毕业论文-发动机悬置系统设计流程及其分析与优化论文.doc

PAGE PAGE 58 发动机悬置系统设计流程及其分析与优化 The Design Process of Engine Mounting System and The Mounting System’s Analysis and Optimization 作者姓名 学 历 硕 士学位类型 学 历 硕 士 机械制造及其自动化学科、专业 机械制造及其自动化 数字化设计与制造研究方向 数字化设计与制造 教 授2007年4月 教 授 2007年4月 发动机悬置系统设计流程及其分析与优化 摘 要 发动机是汽车的主要噪声、振动源之一，合理设计发动机动力总成悬置系统对改善汽车的乘坐舒适性、降低车内外噪声水平有着重要的作用。 本文通过阅读总结国内外文献，介绍了发动机悬置系统设计所需的理论基础和发动机悬置系统设计时的注意事项，并在此基础上总结出发动机悬置系统的设计流程。 通过在ADAMS中建立某款发动机悬置系统的参数化模型，对其进行模态分析，得到了模态频率和各阶振动能量分布。通过分析模态频率和振动耦合水平来确定现有悬置系统的好坏。最后在ADAMS/Insight中进行试验设计，进行灵敏度分析和优化设计。通过灵敏度分析得到对关键响应影响最大的设计变量。通过优化设计，得到满足优化目标的设计变量较优解。 最后对悬置系统的参数化模型进行了二次开发，形成四点悬置系统的专用分析优化模块。用户可以通过菜单、对话框的交互功能，按照操作流程快速、便捷、高效的进行类似发动机悬置系统的分析与优化。 关键词：悬置系统 设计流程 多刚体动力学仿真 能量法解耦 优化设计 The Design Process of Engine Mounting System and The Mounting System’s Analysis and Optimization Abstract Engine assembly is one of the main automobile vibration and noise sources. Proper design of the Engine Mounting System can improve the riding comfort and decrease the interior noise. Firstly, this paper introduces the theory foundation which be useful in the design of Engine Mounting System. Secondly, the author introduces the problems which should be noticed in the Engine Mounting System design. Thirdly, this paper presents the design process of Engine Mounting system. Fourthly, the author built a parametric 6-DOF rigid model for one specific Engine Mounting System in ADAMS. Then he got the modal frequency and the energy distribution of all six order modals. He evaluated the Engine Mounting System’s dynamic performance through its modal frequencies distribution and the vibration decoupling level. He made the Design of Experiment (DOE) in ADAMS/Insight and got the response surface. He made the Sensitivity Analysis and Optimization on the basis of the response surface. Through the Sensitivity Analysis He got the key design variables of the design objectives. Through the Optimization He got the design variables in accord with the design objectives. In the end, the author