臺灣博碩士論文加值系統

本研究旨在針對一自行車煞車碟盤之散熱特性進行模擬分析與實驗，所欲分析之標的物為一基本型態之自行車煞車碟盤、及一組具增強散熱鰭片構造之創新自行車煞車碟盤，以計算流體力學為基礎的電腦輔助工程分析軟體，模擬旋轉中的碟片受到煞車來令片作用下所產生的熱場、及其散熱情形，並利用一自行車碟煞盤散熱測試台，模擬實際煞車動作開始時於碟盤生熱，在煞車來令片放開後進行各項實驗數據記載與驗證。
本研究以相同環境溫度及初始碟盤溫度條件下，針對不同碟盤散熱鰭片幾何設計、風道風速，研究其對於散熱效能及溫度分布之影響。研究結果發現，對於本設計可增加碟盤散熱鰭片之表面積、及風速提升對散熱效果具正面影響，實驗過程中發現，加裝散熱鰭片的碟盤B近盤輻點“3”之升溫時間，比沒安裝鰭片碟盤A耗時多了一倍才達到初始預設溫度條件100度，此表現可能是因其盤輻散熱效率佳，而不易升溫。實驗與分析結果趨勢一致，且再透過實驗與分析的數具結果比對，發現誤差十分接近，均在合理誤差允許值內。新式碟盤設計，雖預期藉由加入導風溝槽的設計來輔助散熱，但對於「近盤輻點3」之散熱效率可能較高，但對於「近碟盤外緣點1」成效並不明顯，推測可能是因為點“1”處之有效線速度較高故通風效率較好，且碟盤處本身已有大面積之空缺孔洞可供散熱。碟盤與碟輻之連接處，實際加工成品為兩者以螺釘固接，而在兩不同金屬的接觸介面，本實驗並未確認其接觸之有效性、傳導之效率；未來將可規劃進一步之實驗驗證此因素。

This research focuses on the heat dissapation characteristics of a bicycle brake disk through both simulations and experiments. It compares an innovative disk with a set of heat dissapation fins against a basic disk. The author models the mechanical design and material properties of the disk braking system and simulates the temperature distribution and change through a computational fluid dynamics simulation software. This research further implements, monitors and verifies the simulation results by replicating a physical model on a test rig.
This research fixes the environment temperature and disk initial temperature, controls the fin design and wind speed and monitors the temperature distribution on the disk surface and the its change rate. The results illustrate positive contributions if the surface area of the dissipation fins enlarges, as well as the wind speed increases. The initial temperature is hard to achieve if the location is near by the dissipation fin, which possibly relates to a higher dissipation performance at these locations. Dissipation rate increase is not significantly raised at the points relatively farer from the fins and near by the outer edge, which is possibly because the ventilation is inherently high. Contact condition between the lining disk ring and the disk spoke (the fin) is not carefully investigated and assumed a normal contact surface, which will be modeled and verified in the future research.

中文摘要...i
英文摘要...iii
誌 謝...iv
目 錄...v
表目錄...vii
圖目錄...viii
第一章 緒論...1
1.1 前 言...1
1.2 研究動機及目的...1
1.3 文獻回顧...2
1.3.1 結構設計...2
1.3.2 工程分析...2
1.3.3 實驗方法...2
1.4 論文架構...3
第二章 數值方法與流程分析...4
2.1數學基礎...4
2.1.1基本假設...4
2.1.2統御方程式...4
2.1.3紊流模式(Turbulent Model)...5
2.1.4材料性質...6
2.1.5數值分析軟體...6
2.2計算幾何...7
2.2.1碟盤與流場幾何...7
2.2.2網格系統...8
2.2.3邊界條件...13
2.3模擬結果...14
第三章 基礎實驗方法與分析...19
3.1基礎實驗...19
3.2實驗設備...19
3.2.1自行車碟盤測試台...19
3.2.2自行車剎車碟盤...22
3.2.3熱像儀...25
3.2.4風速機組...26
3.3實驗方法...27
3.4實驗結果...32
第四章 實驗與分析結果比較...35
4.1實驗與分析結果比較...35
4.1.1碟盤A...35
4.1.2碟盤B...38
4.2改善對策與分析...41
第五章 結論與未來展望...47
5.1結 論...47
5.2 未來展望...47
參考文獻...49
英文論文大綱

1.柯柔羽,(2015年)。「自行車碟煞盤設計之結構強度分析」高雄第一科技大學機械與自動化工程系碩士學位論文。
2.Patankar, S. V. ,(1980). “Numerical Heat Transfer and Fluid Flow,” Hemisphere, Washington, D. C.
3.Sparrow, E. M. and Chyu, M. K.,(1982). “Conjugate Forced Convection Conduction Analysis of Heat Transfer in a Plate Fin, ” ASME, Journal of Heat Transfer, Vol. 104, pp. 204-206.
4.Ali Belhocine, and Mostefa Bouchetara,(2013). “Thermomechanical Stress Analysis of Vehicles Gray Cast Brake, ”SAE paper NO. 2013-01-9116.
5.林子傑，(2016)。「汽車煞車碟盤散熱分析」屏東科技大學車輛工程系碩士學位。
6.傅軍皓，(2016)。「碟盤孔徑對溫度與煞車力之影響」南台科技大學機械工程系碩士學位。