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研究生: 黃資宏
論文名稱: 機構運轉中因振動引發噪音之計算
指導教授: 王志宏
口試委員:
學位類別: 碩士
Master
系所名稱: 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年: 2005
畢業學年度: 93
語文別: 中文
論文頁數: 1冊
中文關鍵詞: 移動邊界連桿機構聲學邊界元素法
外文關鍵詞: moving boundary, linkage, acoustic, BEM
相關次數: 點閱:3下載:0
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  •   在目前,使用理論來計算連桿機構所引發的聲場時,仍多採用傳統的頻域分析技巧,但卻有反射音計算不易、以及無法考慮桿件因移動所造成之聲場影響等缺點。因此本論文引進移動邊界之聲學理論,用以計算連桿機構在高速運轉下桿件的反射音、以及桿件運動對聲場所造成的影響。本論文將以往多用在計算剛體運動(例如計算螺旋槳葉片)所產生之聲場的移動邊界聲學理論,擴展為適合計算連桿機構聲場的形式,並且使用此計算理論,撰寫出一套具有計算連桿機構聲場能力的程式。並且經由模擬,得到連桿機構在運轉時,其聲音頻率會有擴散的現象產生。除此之外,本論文並發展出一套計算「延遲時間」的數值計算方法,可以減少程式的計算時間。


    第一章 前言 1-1 研究動機 1-2 文獻回顧 1-3 研究目標 第二章 理論分析 2-1 符號與座標系統之說明 2-2 移動邊界之波動方程式推導 2-2.1連續方程式 2-2.2動量方程式 2-2.3波動方程式 2-3 波動方程式求解 2-3.1自由空間求解 2-3.2剛體下的簡化 2-3.3振動物體下的簡化 2-3.4靜止邊界下的簡化 2-4 表面積分式 2-4.1聽者移動時的積分表示式 2-4.2表面積分式推導 2-4.3數值方法上的表面積分式 2-5 離散化 2-5.1時間的離散化 2-5.2空間的離散化 2-6 延遲時間的計算 2-6.1使用牛頓法求解 2-6.2使用內插法求解 2-7 數值積分法 2-7.1非奇異元素積分 2-7.2奇異元素積分 2-7.3弱奇異積分的數值積分法 2-7.4強奇異積分的數值積分法 第三章 理論模擬 3-1 程式說明 3-2 程式驗證-點聲源 3-2.1移動之點聲源 3-2.2靜止點聲源與一反射平面 3-3 程式驗證-移動圓球 3-3.1圓球擺動方向平行前進方向,ka=1 3-3.2圓球擺動方向平行前進方向,ka=2 3-3.3圓球擺動方向垂直前進方向,ka=1 3-3.4 圓球脈衝漲縮,ka=1 3-3.5 將係數改為1/2 3-3.6 將法向量反向 3-3.7 跳過奇異積分 3-4 程式除錯 3-4.1 前處理與繪圖程式偵錯 3-4.2 聲壓計算程式之偵錯 3-4.3 表面聲壓計算程式之偵錯 3-4.4 錯誤驗證與結論 3-5 連桿機構之聲場探討 3-5.1 轉速0rpm 3-5.2 轉速650rpm 3-5.3 轉速3300rpm 第四章 結論

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