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研究生:黃建文
研究生(外文):Chien-wen Huang
論文名稱:引擎之油底殼的結構振動與噪音研究
論文名稱(外文):On the Study of the Vibration and Noise of an Engine's Oil Pan
指導教授:徐茂濱徐茂濱引用關係
指導教授(外文):Mau-Pin Hsu
口試委員:徐茂濱
口試日期:2011-07-28
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:機械工程系
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:2011
畢業學年度:99
語文別:中文
論文頁數:124
中文關鍵詞:油底殼引擎有限元素法邊界元素法應變振動噪音
外文關鍵詞:Oil panEngineFinite element methodBoundary element methodStrainVibrationNoise
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  • 被引用被引用:1
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本研究係利用有限元素法模型,導入引擎的各主軸承之負載入力,透過MSC. Nastran求解引擎於中高轉速下(3200與4400 rpm)之振動,接著將引擎表面之振動速度匯入引擎之邊界元素法模型,經由VL Acoustics求得各轉速下之聲功率與聲壓分佈。結果顯示,油底殼元件之噪音量較大,故應對其進行結構強化,以降低其噪音量。在油底殼之模型上,運用應變分佈圖判斷肋條應佈建之部位,得以增加油底殼之剛性,提升該模態之自然頻率並避開其他模態,即可降低其振動量。
  
運用上述技術,將油底殼原於底殼處之半月型與三角型肋條卸除,經改良後之剛性明顯增強,其自然頻率為1368 Hz,經與未卸除前之原頻率(1220 Hz)比較,頻率上升148 Hz。而新增之肋條總重為170克,較原半月型與三角型肋條高出110克,但此上升之幅度僅佔油底殼重量的2.5%,因此其增重尚可接受。
This study adopted the finite element model and imported the loading input force of each major engine bearings. The authors had MSC. Nastran's solving engine vibrated at medium to high rotation speed (3200 and 4400 rpm) and then imported the vibration speed of the engine surface to the engine’s boundary element model. Acoustic power and acoustic pressure distribution of each rotation speed were obtained from VL Acoustics. Our results suggest that the noise volume of oil pan component is higher, and thus its structure should be stiffened to reduce the noise volume. For the oil pan model, the study adopted strain distribution to determine the placement of ribs for stiffening the oil pan, elevating the natural frequency of the model, and keeping it away from other modes. These measures should be cable of reducing the vibration effectively.

According to the above-mentioned techniques, the authors removed the half-moon and the triangle ribs that are originally located at the bottom of the oil pan. After the modification, the stiffness was improved significantly and the natural frequency was increased to 1368 Hz, i.e., a 148 Hz increase from the original frequency (1220 Hz). The total weight of the newly added ribs was 170 g, which is 110 g heavier than the original half-moon and triangle ribs, yet this increase is only 2.5% of the total weight of the oil pan. In other words, this increase in weight is acceptable.
摘 要 I
Abstract II
致 謝 III
目 錄 IV
圖目錄 VII
表目錄 XI
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 3
1.3 文獻回顧 4
1.4 本文架構 9
第二章 邊界元素法之理論與軟體設置 11
2.1. 邊界元素法之簡介與理論 11
2.2. 聲學網格放大 14
2.3. 聲學場點佈建 21
2.4. 網格映射 24
2.5. 小結 25
第三章 整體引擎之強制振動與聲學分析 26
3.1. 整體引擎之振動響應之觀察點 26
3.2. 整體引擎之強制振動分析 38
3.2.1. 引擎於3200 rpm之振動響應分析與結果 38
3.2.2. 引擎於4400 rpm之振動響應分析與結果 51
3.3. 整體引擎之聲學分析 63
3.3.1. 聲學向量轉換理論 63
3.3.2. 整體引擎之邊界元素模型 64
3.3.3. 引擎於3200 rpm之聲學分析與結果 68
3.3.4. 引擎於4400 rpm之聲學分析與結果 71
3.4. 小結 74
第四章 油底殼之結構改良 75
4.1. 油底殼之模型與模態介紹 76
4.2. 由應變變化探討油底殼之改良方針 78
4.2.1. 由應變分佈圖判斷肋條增加位置 81
4.2.2. 肋條建構位置之選擇 85
4.3. 改良模型與原始模型之比較 93
4.3.1. 半月型肋條高度之探討 93
4.3.2. 十字型肋條之質量減少分析 96
4.3.3. 探討油底殼底殼處之剛性 98
4.3.4. 原有模型與改良模型之比較 101
4.4. 油底殼結構改良前後之整體引擎聲學結果比較 103
4.5. 小結 106
第五章 結論與未來建議 107
5.1. 結論 107
5.2. 對未來研究方向的建議 109
參考文獻 110
附 錄A 113
作者簡介 114
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