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 錄
摘要 i
Abstract ii
第一章 緒論 1
1.1 研究動機與目的 1
1.2 研究背景 1
1.3 研究方法與系統(tǒng)描述 1
1.4 論文內(nèi)容概述 2
第二章 制動噪聲產(chǎn)生的機理 3
2.1 制動器的結(jié)構(gòu)和工作原理 3
2.1.1 制動器的結(jié)構(gòu) 3
2.1.2 制動器的工作原理 3
2.2 制動噪聲產(chǎn)生機理 5
2.2.1 制動器激振力的影響 5
2.2.2 制動噪聲的分類 5
2.2.3 制動噪聲產(chǎn)生的原因 6
第三章 制動器的有限元建模 7
3.1 模型的建立及各部件材料的選擇 7
3.1.1 制動鉗體的建模 7
3.1.2 活塞的建模 7
3.1.3 制動片的建模 7
3.2 單元的選擇及網(wǎng)格劃分 9
3.2.1 劃分網(wǎng)格 9
3.2.2 需要注意的問題 11
3.3 選擇邊界條件 11
第四章 有限元分析 12
4.1 有限元法的應用及特點 12
4.1.1 有限元法的應用 12
4.1.2 有限元法的特點 12
4.2 各零件的模態(tài)分析 13
4.2.1 建立閉環(huán)耦合模型 15
4.2.2 摩擦耦合的簡化 17
4.2.3 各零件聯(lián)接面的彈性耦合的簡化 19
4.3 整體模型的有限元分析 21
4.3.1 耦合模型的模態(tài)分析 21
4.3.2 聯(lián)接面處聯(lián)接剛度對系統(tǒng)的影響 22
4.3.3 不穩(wěn)定模態(tài)及其子模態(tài)構(gòu)成 23
第五章 全文總結(jié)展望 25
5.1 全文總結(jié) 25
5.2 展望 25
致謝 26
參考文獻 27