博碩士論文 102323014 詳細資訊




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姓名 林家煌(Chia-huang Lin)  查詢紙本館藏   畢業系所 機械工程學系
論文名稱 壓縮機消音罩聲場模擬分析與實驗
(Acoustic Analysis and Experiment of the Muffler in a Compressor)
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摘要(中) 本文目的在建立一套有限元素分析方式應用於壓縮機消音罩之研發,文中利用聲學模組ANSYS Acoustic ACTx R15.0進行線性的聲學分析,分析迴轉式壓縮機消音罩的消音特性。本文提出兩種邊界條件模型分別計算消音罩的傳遞損失與噪音衰減,並設計實驗量測消音罩的傳遞損失。數值結果顯示在兩種不同邊界條件的模型,其消音特性有許多相似之處。比較實驗結果時以空氣為主要介質,實驗結果與ANSYS模擬結果趨勢相同。欲了解其它介質時的消音特性,可以用橫軸為波數的噪音衰減圖來評估,不需用ANSYS重新計算。
摘要(英) The purpose of this research is to apply finite element analysis, ANSYS Acoustic ACTx R15.0, in solving the characteristics of the muffler in a rotary compressor. This research proposed two models with different boundary conditions to evaluate two indices of noise reduction (NR), transmission loss (TL). The experiment to measure the transmission loss of muffler was also performed. The numerical results obtained by using models with different boundary conditions have many similar characteristics. The experimental results and numerical results by ANSYS showed the same trends where the medium of transmission was air.
關鍵字(中) ★ 消音罩
★ 噪音衰減
★ 傳遞損失
★ ANSYS
關鍵字(英) ★ muffler
★ Noise reduction
★ Transmission loss
★ ANSYS
論文目次 摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VIII
表目錄 XII
符號說明 XIII
第一章 緒論 1
1-1 前言 1
1-2 文獻回顧 2
1-3 論文架構 4
第二章 基本理論 5
2-1 聲學基本理論 5
2-1-1 波動方程式 5
2-1-2 平面波 8
2-2 消音器功能與類型 9
2-2-1 反應型消音器 10
2-2-2 消散型消音器 10
2-3 消音性能評估指標 10
2-3-1 傳遞損失 11
2-3-2 噪音衰減 11
2-3-3 插入損失 12
第三章 數值模型 14
3-1 數值模擬軟體簡介 14
3-2 研究方法與流程 15
3-3 消音罩之振動分析 16
3-3-1振動模型與邊界條件 16
3-3-2自然頻率與模態 17
3-4 消音罩之開放邊界(Open boundary)模型 17
3-4-1開放邊界有限元素模型 18
3-4-2開放邊界聲場模擬設定 18
3-5波導管連接消音罩模型 20
3-5-1傳遞損失計算方式 20
3-5-2波導管尺寸設計與分析 24
3-5-3波導管連接消音罩有限元素模型 25
3-5-4波導管連接消音罩聲場模擬設定 26
第四章 實驗規劃 28
4-1實驗設計 28
4-2實驗設備 29
4-3實驗量測 29
4-4訊號處理與傳遞損失運算 30
第五章 開放邊界之聲學模擬結果與討論 31
5-1 開放邊界之聲學分析 31
5-2 改變消音罩幾何 32
5-2-1 改變消音罩高度 32
5-2-2 改變消音罩出口位置 34
5-2-3 改變消音罩出口形狀 35
5-3 改變聲場介質 36
5-3-1 頻率與波數 36
5-3-2 改變介質與消音罩高度 37
5-3-3 改變介質與消音罩出口位置 38
第六章 波導管連接消音罩之聲學模擬結果與討論 39
6-1 標準問題 39
6-2 波導管形狀選擇 40
6-3波導管連接消音罩之聲學分析 41
6-3-1 全段分析與分段B分析比較 41
6-3-2分段B分析與開放邊界比較 42
6-3-3 數值模擬結果與實驗結果比較 43
第七章 結論與未來展望 45
7-1 結論 45
7-2 未來展望 47
參考文獻 48
參考文獻 某公司迴轉式壓縮機噪音量測資料
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指導教授 黃以玫 審核日期 2015-8-20
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