- 學位論文
管路特性對抑制煞車抖振之效用分析
On the Utility of Pipe Characteristics for Brake Judder Reduction
摘要
近年來由於人們對於乘車舒適性的要求越來越高，使得車廠對於煞車抖振的現象也逐漸重視。本研究運用暫態管流統御方程式，並結合單自由度系統之振動模型，以建構煞車管路壓力數值分析模型，並透過煞車管路實驗之比對，以驗證模型之正確性以及不同管路特性對抑制煞車管路壓力起伏的定量成效。研究結果顯示，此煞車管路壓力數值分析模型在煞車抖振發生的轉速範圍內，可以表現出與實驗測試接近一致的煞車壓力變化趨勢，且在不同管路特性壓力變化的行為中，具有良好的預測效果。據此本研究亦針對煞車管路系統之關鍵特性參數來進行煞車抖振效能之改善，嘗試從壓力變化的角度來抑制煞車抖振，其結果顯示煞車軟管管徑變動的效果將最為顯著。
並列摘要
Owing to the higher standard of driving comfort, brake judder has become an important issue in automotive design. Based on the governing equations of transient pipe flow and the basic one degree of freedom vibration systems, a numerical model for simulations of braking pipe pressure is developed in this research. The model is validated by comparing with the braking pipe pressure experiments. Various pipe structures are investigated. It is found that the model predicts consistent behaviors of brake judder phenomena with different pipe characteristics. Sensitivity of key pipe characteristics is also performed to search for the reduction of brake judder by stabilizing pipe pressure. The results indicate that by changing brake hose diameter is the most effective way in brake judder suppression.