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姓名 彭俊瑋(Chun-Wei Peng) 查詢紙本館藏 畢業系所 機械工程學系 論文名稱 壓縮機消音罩之進階分析與優化設計
(Advanced Analysis and Optimized Design of the Muffler in a Compressor)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 本文主要分析迴轉式壓縮機之消音罩的消音特性,其數值模型利用聲學模組ANSYS Acoustic ACTx R15.0進行聲場分析。其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,並提供消音罩改善設計的方向,使設計者在事前可對消音罩進行消音分析與研究。
文中主要分為兩個部分,第一部分為波導管連接消音罩模型,假設出口為開放性邊界條件之設定並將實際實驗量測之模型匯入ANSYS聲學模組進行分析,比較實驗結果時以空氣為聲音傳導介質且以傳遞損失作為主要消音性能評估之指標,實驗結果與數值模擬結果趨勢相同。第二部分為消音罩設計,為探討消音罩本身之內部聲場,將出入口波導管皆移除,模擬時以R22a冷媒為聲音傳導介質且以噪音衰減作為主要消音性能評估之指標。摘要(英) This research focused on the noise reduction characteristics of the muffler in a rotary compressor. A finite element software, ANSYS Acoustic ACTx R15.0, was used to obtain the mathematical solutions. This research was split up into two sections. At the beginning, the muffler was connected to waveguides with anechoic outputs in the simulation model. The introduction of waveguides is to guarantee the existence of plane sound wave in the calculation of Transmission Loss (TL). The acoustic medium is air. Then, an experiment was performed. The numerical results and experimental results compare well if the output boundary of waveguides was chosen the open boundary. The second part of the research is the study of a real muffler without waveguides. The acoustic medium R22a. Another index, Noise Reduction (NR), was adopted to assess the noise reduction performance. A parameter study of various geometric parameters was reported. Design suggestions of the muffle were also given. 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 目錄
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 5
第二章 基本理論 6
2-1 聲學基本理論 6
2-1-1 波動方程式 6
2-1-2 平面波 9
2-1-3 管路聲學阻抗 11
2-2 消音器功能與類型 11
2-2-1 反應型消音器 12
2-2-2 消散型消音器 12
2-3 消音性能評估指標 12
2-3-1 傳遞損失 13
2-3-2 噪音衰減 13
2-3-3 插入損失 14
第三章 數值模型 16
3-1 數值模擬軟體簡介 16
3-2 研究方法與流程 17
3-3波導管連接消音罩模型 18
3-3-1傳遞損失計算方式 18
3-3-2波導管尺寸設計與分析 20
3-3-3波導管連接消音罩有限元素模型 21
3-4波導管連接消音罩聲場模擬設定 22
3-4-1加入空氣阻力因素 22
3-4-2聲固耦合分析 23
3-4-3簡諧分析 23
3-4-4暫態分析 24
第四章 實驗規劃 25
4-1實驗設計 25
4-2實驗設備 26
4-3實驗量測 26
4-4訊號處理與傳遞損失運算 27
第五章 波導管連接消音罩之聲場模擬結果與討論 28
5-1 波導管形狀選擇 28
5-2 其他可能影響聲場之因素 29
5-2-1 空氣黏滯係數 29
5-2-2 聲固耦合 29
5-3 波導管連接消音罩之聲場分析 30
5-3-1 不同輸入源之比較 31
5-3-2 簡諧分析與暫態分析之比較 31
5-3-3 無迴響邊界與開放性邊界之比較 31
5-3-4 數值模擬結果與實驗結果比較 32
第六章 開放性邊界之聲場模擬結果與討論 33
6-1聲場介質之比較 33
6-2單一管徑波導管之影響 34
6-3改變消音罩幾何尺寸 36
6-3-1改變消音罩高度 36
6-3-2改變消音罩出口位置 37
6-3-3改變消音罩出口形狀 39
6-3-4改變消音罩出口大小 40
6-4以出入口聲壓值探討消音罩之消音特性 41
6-5新設計 42
第七章 結論與未來展望 43
7-1 結論 43
7-2 未來展望 45
參考文獻 46參考文獻 甲公司迴轉式壓縮機噪音量測資料
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