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研究生:吳岱霖
研究生(外文):WU TAI-LIN
論文名稱:汽車加裝行李架之氣動聲場分析
論文名稱(外文):The aeroacoustic analysis on luggage racks of vehicles
指導教授:曾慶祺
指導教授(外文):Tseng Ching-Chi
學位類別:碩士
校院名稱:大華技術學院
系所名稱:機電研究所
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:2008
畢業學年度:97
語文別:中文
論文頁數:93
中文關鍵詞:計算流體力學氣動學氣動聲學噪音氣動噪音
外文關鍵詞:aeroacousticCFDdesignaerodynamic
相關次數:
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本文利用數值方法探討汽車車頂裝設行李架在不同條件下的氣動聲場現象,以提供業界在設計行李架之參考。文中利用電腦輔助設計軟體PRO/ENGINEER進行實體三度空間之模型建立,並以FLUENT軟體搭配 紊流模式和LES紊流模式,進行三維流場模擬分析,繼而應用FLUENT內建之聲場模組以進行聲場模擬分析。
模擬分析結果顯示,流場流動愈平順其所產生的氣動聲壓值愈低,因此在設計行李架時,應儘量朝向流線構形及降低高度來設計,以達降低氣動噪音之目的。
This study employed numerical method to study the aeroacoustic phenomena on luggage racks of vehicles in different conditions and aimed to provide a better aeroacoustic performance for the design of luggage racks. PRO/ENGINEER was used to build three-dimension solid models and CFD software FLUENT was then utilized to simulate the aeroacoustic fields.
The results show that the smoother flow is, the lower the sound pressure level is. Design of luggage racks should be emphasized on streamlining the shape and lowering the position of installation to reduce aeroacoustic noises.
摘要……………………………………….………….………………….…I
英文摘要………………………………………………..…………………II
目錄…………………………………………………….…………………III
表目錄………………………………………………….…………………IV
圖目錄…………………………………………………..…………………V
第一章、緒論………………………………………….…………………..1
1-1前言………………………………………………….……………1
1-2噪音機制…………………………………………….……………2
1-3氣動噪音與文獻回顧…………………………….………………7
1-4研究目的…………………………………………………………16
第二章、物理模式………………………………………………………..19
2-1物理模型…………………………………………………………19
2-2數學模式…………………………………………………………22
第三章、數值方法…………………………………………………………33
3-1邊界設定………………………………………………................34
3-2模型網格建構與格點測試………………………………………34
3-3求解暫態紊流流場………………………………………………35
3-4接收點之聲場頻譜………………………………………………36
第四章、結果與討論……………………………………………………..39
4-1外型改變…………………………………………………………39
4-2流場速度變化……………………………………………………62
4-3行李架與車頂距離變化…………………………………………76
4-4聲場模擬結果匯整………………………………………………90
第五章、結論……………………………………………………..............91
參考資料……………..………..………………………………………….92
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