Abstract
With the increasing vehicle population in our country,people not only pay attention to the price and safety of automobiles,but also pay more and more attention to the automobile comfort such as vibration and noise when buying automobiles.With the advancement of science and technology,the interior vibration and noise levels have been lowered obviously.However the vibration and noise of certain subsystems and components such as brake systems become much noticeable.So,study of the vibration and noise of brake systems becomes very important,which has high practical value for brake system design.
In this article,the finite element method combined with mode analysis was introduced to study the brake squeal propensity and the optimization of brake system structure design based on brake squeal propensity. A new finite element model of brake system based on surface contact was established. Complex eigenvalue analysis was then used to predict the instable modes and their brake squeal propensity. Parameter study was performed on the system design parameters such as friction-induced damping, friction coefficient,brake force and rotor rotational velocity. Finally, optimization of key parts of the brake system was conducted to reduce the brake squeal propensity. The method will prove to be useful for future disk brake noise analysis and structural optimization design.
Keywords:brake squeal propensity surface contact nonlinearity
structure optimization
目 录
摘要 i
Abstract ii
第一章 绪论 1
1.1 研究动机与目的 1
1.2 研究背景 1
1.3 研究方法与系统描述 1
1.4 论文內容概述 2
第二章 制动噪声产生的机理 3
2.1 制动器的结构和工作原理 3
2.1.1 制动器的结构 3
2.1.2 制动器的工作原理 3
2.2 制动噪声产生机理 5
2.2.1 制动器激振力的影响 5
2.2.2 制动噪声的分类 5
2.2.3 制动噪声产生的原因 6
第三章 制动器的有限元建模 7
3.1 模型的建立及各部件材料的选择 7
3.1.1 制动钳体的建模 7
3.1.2 活塞的建模 7
3.1.3 制动片的建模 7
3.2 单元的选择及网格划分 9
3.2.1 划分网格 9
3.2.2 需要注意的问题 11
3.3 选择边界条件 11
第四章 有限元分析 12
4.1 有限元法的应用及特点 12
4.1.1 有限元法的应用 12
4.1.2 有限元法的特点 12
4.2 各零件的模态分析 13
4.2.1 建立闭环耦合模型 15
4.2.2 摩擦耦合的简化 17
4.2.3 各零件联接面的弹性耦合的简化 19
4.3 整体模型的有限元分析 21
4.3.1 耦合模型的模态分析 21
4.3.2 联接面处联接刚度对系统的影响 22
4.3.3 不稳定模态及其子模态构成 23
第五章 全文总结展望 25
5.1 全文总结 25
5.2 展望 25
致谢 26
参考文献 27