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研究生:黃士晉
研究生(外文):Shih-Chin Huang
論文名稱:摩托車碟盤的孔洞形狀與排列對煞車性能之影響
論文名稱(外文):Influence of Cross-Drilled Holes on the Performance of Motorcycle’s Disc Brake
指導教授:鍾豐洸
指導教授(外文):Feng-Kuang Chung
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:模具工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:53
中文關鍵詞:碟盤煞車孔洞形狀摩擦接觸熱傳MATLABCOMSOLALE模組
外文關鍵詞:disc brakecross-drilled holefrictional contactMATLABCOMSOLArbitrary Lagrangian-Eulerian mode
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在摩托車的煞車碟盤上製作縱向孔洞是一項常見的設計,其目的為減輕碟盤重量與降低碟盤溫度,本文擬探討摩托車碟盤的孔洞形狀與排列對煞車性能之影響。先以容積溫度分析法 (Lumped capacitance method) 做初步分析,使用MATLAB軟體求解非線性常微分方程式;再利用COMSOL Multiphysics軟體做暫態三維實體模型的分析,依照不同的煞車模式輸入碲片與碟盤的接觸壓力,並使用ALE (Arbitrary Lagrangian-Eulerain) 模組進行動態摩擦接觸的熱傳模擬,計算出煞車及冷卻期間的溫度變化與分布。
碟盤上的孔洞設計會影響碟盤的溫度變化,由於多數摩擦材料的摩擦係數是溫度的函數,因此它們也直接影響到煞車的距離與時間。在容積溫度分析法中,任何孔洞的形狀與排列皆可歸納為三個參數,包括:質量比率(βm)、表面積變化率(βa)與面積一次矩變化率(βM),文中以該三參數為自變數,比較在緊急煞車、等速煞車和循環煞車等三種模式中,不同的參數搭配對碟盤溫度以及煞車性能的影響。分析結果顯示:使用石綿基或有機基摩擦材料時,若以固定油壓推力做緊急煞車,當碟盤βm值為0.8、βa值為1.08、βM值為0.8257時可以獲得最短的煞停距離;等速煞車時,未鑽孔碟盤溫度為最低,其最高溫較前述碟盤低約55℃;循環煞車時,當碟盤βm值為0.9、βa值為1.08、βM值為0.9147時,在數種常用的循環煞車測試條件中,普遍獲得較低之碟盤溫度。綜合以上三種煞車模式,本研究規劃出新的碟盤孔洞型態,其βm、βa、βM值分別為0.9、1.08和0.9147,並使用COMSOL模擬三維實體模型做分析,將之與實心和兩種市售碟盤的分析結果做比較,發現在三種煞車模式下,未鑽孔碟盤與新設計碟盤,均獲得較低的煞車溫度,而考慮碟盤輕量化問題,選擇孔洞碟盤能減輕碟盤之重量,故新設計碟盤為最佳之選擇。
Perforating holes on a motorcycle’s brake disk has two purposes. The one is to reduce the weight of the disk and the other is to increase the cooling area of the disk so as to lower down the raised temperature created through frictional sliding between pad and disk. This study investigates the influence of cross-drilled holes on the performance of braking. As a preliminary analysis, lumped capacitance model was employed for thermal analysis. The nonlinear differential equations in this model were solved by the use of MATLAB software. Three dimensional transient models using COMSOL multiphysics were developed subsequently to simulate the heat transfer process, which contains a convection and conduction mode as well as a moving mesh ALE mode.
In lumped capacitance method, all kinds of hole arrangements, including size, shape, and position, may be deduced into three parameters. They are the mass ratio, βm, the cooling area ratio, βa, and the area-moment ratio, βM. Temperature evolution, and the shortest distance and time required to stop the motor vehicles were compared under different combination of the three parameters for three different braking models using four different types of frictional materials. A new hole pattern compromised from the results of lumped analysis is proposed. The values ofβm, βa, andβM of the newly designed disk are 0.9, 1.08, and 0.9147 respectively. Braking behavior of this disk was also compared with that of a solid disk and two commercial disks in COMSOL. Generally speaking, the proposed disk has its maximum temperature occurred in most braking processes as low as a solid disk does. From the energy saving consideration, the lighter the disk is, the better it is. Therefore, the proposed design is the best choice between the available disks.
第一章 緒論
第二章 容積溫度分析法
第三章 三維實體模型分
第四章 結果與分析討論
第五章 結論
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