煞車抖振之油壓特性分析與改良

The characteristics of oil pressure on the reduction of brake judder

蔡偉斌(Wai-Pan-CHOI)

指導教授 ： 傅增棣

國立臺灣大學/工學院/機械工程學研究所/碩士(2006年)

https://doi.org/10.6342/NTU.2006.02928

摘要

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。

關鍵字

煞車抖振 ； 煞車管路壓力 ； 特徵線法

並列摘要

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.

並列關鍵字

brake judder ； braking pipe pressure ； method of characteristics

參考文獻

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