頁籤選單縮合
題名 | 煞車系統之振動分析及異音預測=Vibration Analysis and Squeal Prediction for the Brake System |
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作者姓名(中文) | 謝正昌; 王昭男; | 書刊名 | 應用聲學與振動學刊 |
卷期 | 2:1 2010.04[民99.04] |
頁次 | 頁15-25 |
分類號 | 447.125 |
關鍵詞 | 煞車異音; 非對稱矩陣; 模態分析; 複數特徵值法; 模態耦合; Brake squeal; Unsymmetric matrix; Modal analysis; Complex eigenvalues method; Modal coupling; |
語文 | 中文(Chinese) |
中文摘要 | 本文主要探討目的是研究煞車系統元件對系統本身運動穩定性所造成的影響,利用煞車系統所產生之不穩定振動,進而預測煞車異音的生成。當煞車系統承受摩擦襯墊與碟盤接觸面間的摩擦力時,會有系統模態耦合共振現象發生,在本文裡,利用有限元素分析軟體(ANSYS),建立實際摩托車的煞車系統模型,並推導出接觸面間的摩擦耦合作用力關係,運用線性交接面連結元素建構出一非對稱摩擦耦合勁度矩陣,模擬摩擦襯墊與碟盤交接面之間的耦合作用力影響,並建立煞車系統在接觸摩擦耦合作用力影響下的振動方程式,利用複數特徵值法,從計算所得到的複數特徵值判斷系統運動是否爲穩定,進而預測可能發生煞車異音的頻率以及振動模態,並發現產生煞車異音的模態會有模態耦合的現象。最後藉由分析不同的系統參數值以及改變摩擦襯墊的幾何形狀,探討系統參數及摩擦襯墊的幾何形狀對煞車系統穩定度的影響,並可利用模態耦合的現象預測系統運動即將發生不穩定時的臨界系統參數值,其模擬分析的結果可作為改善煞車異音的建議,其中以增加阻尼效應對消滅煞車異音有顯著的幫助。 |
英文摘要 | This paper provides the method for determining the stability characteristics of the brake system assembly. When the motion of brake system is unstable, it is the likelihood of brake squeal. The brake squeal typically occurs at unstable resonant frequencies of brake system. Finite element methods are used to derive the equations of motion for the brake system of motorcycle. The components of brake system are coupled together in the system model including the friction coupling terms between the pad and disc. The proposed friction coupling formulation produces an asymmetric system stiffness matrix. This provides the mechanism necessary for energy by varying force to be fed into the vibrating system that will excite the unstable modes of the system. The application of complex eigenvalues analysis in the finite element friction coupling model of the brake system shows that the real parts of complex eigenvalues reveal which modes are unstable and tend to generate the brake squeal. The image parts of complex eigenvalues is the frequency of the brake squeal. This analysis to be a predictive tool to brake squeal. An attempt is made to investigate the effect of the operational parameters (friction coefficient, brake pressure and proportional damping) and the modification of pad shape on the brake squeal. The simulation results show that modal coupling phenomenon may be the mechanism of brake squeal. Brake squeal can be reduced by decreasing the friction coefficient and brake pressure. The effect of modifying pad shape on the squeal is also obvious. However, increasing the damping have good results for eliminating brake squeal. |
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