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研究生(外文):Wei-Chen Wang
論文名稱(外文):Aeroacoustic Reduction by Changing the Profile of the Engine Fans
指導教授(外文):Jiunn Fang
外文關鍵詞:engine fansvibrationaeroacoustic
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In today’s society, because of environment protection principle raises up, aeroacoustic problem becomes more seriously than before. In addition, how to avoid the annoying noise, that from the contact between large compression blades and air, is a good topic to discuss too. The change of blade’s characteristic also affects the vibration of structure and the aerodynamics. Thus, it is an interesting research topic to know how to optimize the design of large compression blade’s acoustic. However, it takes lots of time and money to design airplane’s engine and industry blade’s leaf. It is because we use CAD/CAM to produce and CNC to manufacture. Moreover, we will do serial tests after constructing them together.
CAD/CAM/CAE integrates design and manufacture. This research is using computer aided engineering mode to discuss how does the shape of engine’s blade effect convection and vibration of structure. Refer to GE90’s engine blade, that designed by American’s company GE, we use Pro/E to construct blade’s shape. By reading some documents, we modify some parts of the blade’s shape such as the angle and radian. Pro/E not only has powerful parameter design feature, but also be able to pair with FORTRAN and other computer languages. In this research, we design the model, grid generation and Pre-processing under Pro/E’s environment. Therefore, we can move the characteristics of blade very easily and it can save a lot of human resources.
Pairing with the most widely used industry software ANSYS to analyze the vibration of structure, and Star-CD to calculate and find the aeroacoustics source. We expect the changing of shape can lower down the noise, and do not affect the blade structure to satisfy high flow rate and low noise for airplane engine and industry blade need. After modifying, calculating and analyzing, we can confirm when we attach the forward-swept in the front of the blade leafs, it is able to cut down noise. However, there is a condition. If the angle of the forward-swept is too wide, it will not be able to reduce noise and even the blade is not able to work.
誌謝 I
摘要 II
目錄 V
圖目錄 VII
表目錄 X
第1章、 緒論 1
第1.1節 研究動機 1
第1.2節 文獻回顧 1
第1.3節 研究方法 3
第1.4節 組織與章節 3
第2章、 基礎理論 5
第2.1節 航空噪音(AEROACOUSTIC)分析 5
第2.2節 振動學 6
第2.2.1節 靜態頻率分析(Modal Analysis) 7
第2.2.2節 動態頻率分析(Dynamic Analysis) 7
第2.2.3節 旋轉軟化效應 8
第2.2.4節 應力強化剛性 9
第2.2.5節 層板型複合材料扇葉結構振動與模態之分析 10
第2.3節 有限元素法及網格 11
第2.3.1節 有限元素法基本原理 11
第2.3.2節 元素種類 12
第2.3.3節 結構性網格與非結構性網格 12
第3章、 扇葉設計 14
第3.1節 扇葉設計 14
第3.1.1節 原始葉片模型建構 14
第3.1.2節 葉片參數化 14
第3.1.3節 繪製新型風扇 15
第4章、 聲音及振動頻率分析 17
第4.1節 噪音分析 17
第4.1.1節 Star-CD網格之建構 18
第4.1.2節 邊界條件之設定 19
第4.2節 振動頻率分析 20
第4.2.1節 ANSYS網格之建構 20
第4.2.2節 邊界條件之設定 21
第5章、 結果與討論 22
第5.1節 流場噪音分析 22
第5.1.1節 流場壓力分布 22
第5.1.2節 噪音源分布情況 23
第5.2節 結構振動分析 24
第6章、 結論與未來工作 26
第6.1節 結論 26
第6.2節 未來工作 26
參考文獻 28
附錄 32
附錄1 PRO/E扇葉剖面輸入規格 33
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