摘 要
发动机激励和路面激励是汽车的两大振源，动力譆@尚孟低扯愿衾胝饬酱笳裨雌鹱欧浅Ｖ匾淖饔茫阂皇窃诓徊硕缮娴那疤嵯拢惺芏ψ@@傻闹亓考案衾攵ψ@@上虺导艿恼穸荩歉衾肼访婕だ鸬某导苷穸蚍⒍@@傻拇荨Ｐ孟低车男阅芙诤艽蟪潭壬嫌跋煺礜VH性能，因此悬置系统的优化设计一直是汽车设计行业的热门话题。目前的悬置优化设计主要有两类方法，一是传统的模态解耦法，该法主要通过调整动力譆@尚孟低掣斩染卣螅谋湎低衬Ｌ纯刂葡低吃诩だ饔孟碌南煊Γ欢侵苯右远煊ξ勘辏呕玫牟问档投ψ@@捎氤瞪砑涞牧Υ荨１疚姆直鹩τ谜舛址椒ǎ阅彻爸们扒浇纬档男孟低澄芯慷韵螅孕孟低车挠呕侍饨蟹治龊脱芯俊Ｖ饕ㄒ韵铝礁龇矫娴哪谌荩裹br>（一） 探讨FF式汽车动力譆@筛粽裣低车纳杓圃蚝筒贾眯褪剑孕孟低车某跏疾贾媒衅兰郏环治鋈哦だ投ψ@@善德什贾茫晃竺娴挠呕杓铺峁├砺刍 Ⅻbr>（二） 建立动力譆@尚孟低车氖Ｐ停扑悴⒎治鱿低衬Ｌ⒂τ媚芰糠ń怦罾砺鄱孕孟低辰薪怦罴扑悖锏蕉ψ@@尚孟低衬Ｌ怦畹男ЧⅫbr>（三） 利用多体动力学软件 ADAMS(Automatic Dynamic Analysis of Mechanical System)建立悬置系统刚体动力学模型；结合本车实际，以动态响应为目标，在强迫激励下，对原有悬置的隔振性能进行评价；以对隔振影响较大的参数为设计变量，利用二次序列规划法（SQP），对悬置系统进行优化设计。
关键词：悬置系统，布置形式，解耦计算，优化设计，MATLAB, ADAMS, 动态响应
ABSTRACT
The exciting forces from engine and road are two main vibration sources that cause vehicle vibrating, the engine mount system plays an important role in isolating vibration. firstly, it must isolate the transfer of vibration from engine to body, secondly, it must prevent the body vibration caused by road from engine-mount system. The performance of engine mount system has much effect on NVH performance of car, so the mount system design is always a hot topic in vehicle design trade. At present, there are two main methods to design mount system, one is the traditional method―mode decoupling, which controls the system response by changing the stiffness matrix to arrange system modes; the other one controls force transfer between the engine and body by optimizing the parameters of mounts with dynamic response as objective directly. With the two methods, optimization of engine mount system of some national FF car is studied in this paper. The following content is included:、
1 The mathematic model of engine mount system that is used to mode decoupling is set up, With energy mode decoupling theory, the modes of engine mount system are decoupled
2 According to the rules that are applied to the power train’s six rigid body modes frequency targets, couple vs. decoupled modes, etc. The selection and laying out mount locations and specifying the insulators are completed in the design phase considering the package restraints
3 A six-degrees rigid dynamic model are developed under the ADAMS environment and then depending on the computed response sensitivities to determine the changes to the mounting system that will lead to minimum response at user-defined location in the vehicle. Design variables are mount locations, angle and mount stiffnesses, which are changed until the lowest level of response is found. The isolation characteristics results from the application of this method is quite better than the traditional ‘rules –of-thumb’ methods.
Key words: mounting system, mode-decoupling ,the optimizing design, MATLAB, ADAMS, dynamic response
目 录
摘 要 3
ABSTRACT 4
1 绪论 7
1.1 发动机悬置系统优化技术研究的意义 7
1.2 发动机悬置系统的发展及现状 8
1.3 本论文研究内容与思路 12
2 动力譆@尚孟低车奈恢貌贾眉捌德势ヅ 13
2.1 概述 13
2.2 FF 式汽车动力譆@尚孟低车牟贾梅绞 13
2.3 对本文悬置系统初始布置的分析 18
2.4 共振避免问题 18
2.4.1 扰动激励的分析 19
2.4.2整车模态与子系统模态 20
2.4.3 动力譆@傻钠德什贾 20
2.5 小结 22
3 动力譆@尚孟低车慕怦钣呕杓 23
3.1 概述 23
3.2 动力譆@尚孟低匙晗档娜范 23
3.2.1 主惯性轴坐标系的确定 24
3.2.2 扭轴坐标系的确定 25
3.3 动力譆@尚孟低呈Ｐ偷慕 28
3.3.1 动力譆@尚孟低匙杂烧穸⒎址匠 28
3.3.2 动力譆@尚孟低巢问幕袢 30
3.3.3 原始参数向解耦坐标系（扭轴坐标系）的转化 32
3.3.4 数学模型的建立 34
3.4 动力譆@尚孟低痴穸Ｌ肽芰糠Ｌ怦 34
3.4.1 能量解耦法 35
3.4.2 原动力譆@尚孟低车墓逃刑匦院驼裥湍芰糠植 36
3.5 动力譆@尚孟低车慕怦钣呕 37
3.5.1 设计变量的选择 37
3.5.2优化目标向量、优化目标函数向量及加权因子向量 37
3.5.3 约束条件 38
3.5.4 优化方法 39
3.5.5 优化结果 39
3.6 小结 40
4 基于动态响应的悬置系统优化设计 41
4.1 概述 41
4.2 发动机激励的确定 41
4.2.1 往复惯性力的分析 42
4.2.2 颠覆力矩的分析 44
4.3 动力学模型的建立 49
4.3.1 假设与简化 49
4.3.2动力譆@尚孟低巢问幕袢 50
4.3.3 激励的处理 51
4.3.4 动力譆@尚孟低扯ρХ治瞿Ｐ偷娜范 51
4.4 悬置系统动力学分析 52
4.4.1 目标函数、约束条件和设计变量的确定 53
4.4.2 优化结果分析和评..
