傅增棣臺灣大學：機械工程學研究所蔡偉斌Wai-Pan-CHOI2007-11-282018-06-282007-11-282018-06-282006http://ntur.lib.ntu.edu.tw//handle/246246/61180本研究嘗試運用流體力學中的質量與動量守恆定律，結合單自由度系統振動模型，建構四分之一車的煞車油壓管路系統數值模型，透過特徵線法求得煞車時之管路壓力變化，並與實車測試所得之管路壓力進行比對，以驗證煞車油壓管路數值模型之正確性。研究結果顯示，煞車管路數值模型於低減速度時對油壓振幅的預測結果差異較大，而於較高減速度下則能較準確地預測煞車管路之壓力變化。另外，在本研究中亦針對煞車管路系統之特性參數進行煞車抖振性能之敏感度分析，並針對煞車管路壓力變化之抑制提出改善建議，以期望能藉此降低在煞車抖振的過程中來自碟盤振源之影響。By applying the continuity and momentum equations of fluid dynamics and one degree of freedom vibration systems, a quarter car mathematic model for the prediction of braking pipe pressure is established in this research. The method of characteristics is used to derive the variation of pipe pressure and simulation results are validated by data from field tests. It is found that the model can predict well for situations of high decelerations but deviation exists for low decelerations and speeds. Sensitivity analyses are performed with respect to various system parameters against pressure mean and variation. Suggestions for the reduction of pipe pressure variation are then proposed in this project to attenuate the influence of disk thickness variation on brake judder.誌　謝................................................i 中文摘要.............................................ii 英文摘要............................................iii 目　錄...............................................iv 第一章 緒論 1 1.1 研究背景與動機...............................1 1.2 文獻回顧.....................................2 1.2.1 綜合分析.....................................3 1.2.2 成因分析.....................................3 1.2.3 影響分析.....................................5 1.2.4 煞車管路壓力研究.............................6 1.3 研究方法與流程...............................7 1.4 論文架構.....................................8 表格..................................................9 圖例.................................................10 第二章 研究方法 14 2.1 前言........................................14 2.2 煞車管路數值模型............................14 2.2.1 基本假設....................................14 2.2.2 動量方程式..................................15 2.2.3 連續方程式..................................16 2.2.4 起始與邊界條件..............................18 2.3 數值模擬方法................................19 2.3.1 特徵線法....................................19 2.3.2 液固耦合邊界模型............................20 2.4 傅立葉轉換..................................22 2.5 統計相關性分析..............................23 圖例.................................................24 第三章 實車測試與模型驗證 27 3.1 前言........................................27 3.2 煞車抖振行為之實車量測......................27 3.2.1 實驗方法與流程..............................27 3.2.2 實驗成果分析................................29 3.3 數值模型參數設定............................31 3.3.1 系統特性參數之估算..........................32 3.3.2 邊界輸入條件之量測..........................33 3.4 模擬成果與實車測試之比對驗証................34 3.4.1 定性比對分析................................35 3.4.2 定量比對結果................................36 表格.................................................38 圖例.................................................42 第四章 煞車抖振之敏感度分析 54 4.1 前言........................................54 4.2 敏感度分析..................................54 4.2.1 煞車總泵參數................................55 4.2.2 煞車管路參數................................56 4.2.3 煞車分泵參數................................58 4.2.4 綜合量化分析................................59 4.3 煞車抖振之改善建議..........................59 4.3.1 非等管徑之進階應用..........................60 4.3.2 組合改善對策................................62 表格.................................................63 圖例.................................................65 第五章 結論與建議 70 5.1 結論........................................70 5.2 建議與未來展望..............................71 參考文獻 733228526 bytesapplication/pdfen-US煞車抖振煞車管路壓力特徵線法brake judderbraking pipe pressuremethod of characteristicsthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/61180/1/ntu-95-R93522613-1.pdf