劉正良臺灣大學：機械工程學研究所郭志平Kuo, Chih-PingChih-PingKuo2007-11-282018-06-282007-11-282018-06-282006http://ntur.lib.ntu.edu.tw//handle/246246/60997對於實心碟盤而言，盤面上之孔洞是一項常見之設計特徵。孔洞會減少碟盤之質量，使熱容量降低；孔洞也會改變總表面積大小，影響對流冷卻。由於孔洞同時對碟盤之儲熱與散熱能力造成變化，碟盤之溫度必定受到影響。本研究利用有限元素法，模擬數組不同鑽孔模式之碟盤模型，在不同車輛行駛模式下之溫度變化。再根據模擬結果推論孔洞對碟盤溫度之影響。本研究最後以一範例，展示不同之鑽孔模式，使碟盤保持在最高容許溫度以下，同時達成輕量化目標。For the solid brake disc, cross drilling on the disc surface is a common design to reduce the total mass of the disc. These holes also change the total surface area of the disc and affect the convection capability. By altering both heat storage and heat dissipation simultaneously, the cross-drilled holes would definitely influence the disc temperature change during operation. In this research, finite element method (FEM) is used to simulate the disc temperature models of several discs with different hole patterns. The influence of the cross-drilled holes on the temperature change of the solid brake disc is thus found. In the end, an example is introduced to show how the hole pattern of a disc is modified so that the disc temperature is kept under the highest limit allowed.致謝..................................................Ⅰ 中文摘要..............................................Ⅱ 英文摘要..............................................Ⅲ 目錄..................................................Ⅳ 圖目錄................................................Ⅵ 表目錄................................................Ⅸ 符號目錄....................................................Ⅹ 第一章 前言............................................1 1-1 研究背景與動機.....................................1 1-2 文獻回顧...........................................4 1-3 研究目的與方法.....................................9 1-4 論文架構...........................................9 第二章 理論建構...................................... 11 2-1碟盤上的煞車能輸入................................ 11 2-1-1車輛各輪上的煞車力.............................. 11 2-1-2各個車輪上的煞車能.............................. 14 2-1-3碟盤吸收的煞車能................................ 16 2-2 碟盤的溫度變化................................... 17 2-2-1 碟盤的平均溫度變化模型......................... 17 2-2-2 碟盤的細部溫度變化模型......................... 19 2-2-3 碟盤的對流散熱................................. 23 2-3 鑽孔對碟盤表面積與質量之影響..................... 24 2-3-1 鑽孔對碟盤表面積之影響......................... 24 2-3-2 鑽孔對碟盤質量之影響........................... 27 第三章 建立分析模型.................................. 29 3-1用於模擬之碟盤模型................................ 29 3-1-1碟盤之尺寸...................................... 29 3-1-2碟盤之材質...................................... 37 3-2碟盤之煞車能輸入與對流散熱模型.................... 38 3-2-1模擬載具之規格.................................. 39 3-2-2模擬載具之行駛模式.............................. 40 3-3建立有限元素模型.................................. 42 3-3-1建立模型並給定邊界條件.......................... 42 3-3-2網格大小與暫態分析之時間增量.................... 50 3-3-3有限元素模型與平均溫度模型之比較................ 55 第四章 模擬結果比較.................................. 59 4-1碟盤之最高溫度變化與比較.......................... 59 4-1-1鑽孔後等面積不等質量之碟盤其最高溫度變化與比較...59 4-1-2鑽孔後等質量不等面積之碟盤其最高溫度變化與比較.. 74 4-1-3不同孔徑與孔數觀點之碟盤最高溫度變化與比較...... 79 4-2碟盤之最高溫度變化與孔位排列之關係................ 84 第五章 以孔洞改進實際車輛之碟盤設計.................. 89 5-1背景介紹.......................................... 89 5-1-1本範例中之車輛介紹.............................. 89 5-1-2本範例中之行駛模式.............................. 91 5-2以孔洞改善碟盤設計................................ 94 5-2-1原始之碟盤設計.................................. 94 5-2-2以不同鑽孔模式改進碟盤設計...................... 98 5-2-3利用表面積變化率修改碟盤設計................... 105 5-2-4鑽孔模式之設計流程............................. 108 第六章 討論......................................... 111 第七章 結論與建議................................... 115 7-1結論............................................. 115 7-2未來研究方向之建議............................... 117 參考文獻............................................ 1183457552 bytesapplication/pdfen-US煞車碟盤孔洞溫度有限元素法brakebrake disccross-drilled holetemperaturefinite element methodthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/60997/1/ntu-95-R91522603-1.pdf