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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳國在 | |
| dc.contributor.author | Chia-Liang Chang | en |
| dc.contributor.author | 張嘉良 | zh_TW |
| dc.date.accessioned | 2021-06-08T00:17:20Z | - |
| dc.date.copyright | 2013-07-31 | |
| dc.date.issued | 2013 | |
| dc.date.submitted | 2013-07-29 | |
| dc.identifier.citation | [1] L. L. Beranek, “Noise and vibration control,” New York; McGraw-Hill, pp. 362-405, 1971.
[2] 劉仁超, “可變容積式共鳴消音器之設計,” 生物產業機電工程研究所, 台灣大學, 台北, 2005. [3] M. L. Munjal, Acoustics of ducts and mufflers with application to exhaust and ventilation system design, New York: John Wiley & Sons, 1987. [4] 林士淳, “可變容積消音器消音能力之模擬分析,” 生物產業機電工程研究所, 台灣大學, 台北, 2010. [5] D. D. Davis, “Theoretical and experimental investigation of mufflers with comments on engine-exhaust muffler design.,” 1954. [6] L. E. Kinsler, and A.R.Fery, Fundamental of acoustics., New York: John Wiley & Sons, 1962. [7] J. W. Sullivan, and M.J.Crocker, “Analysis of concentric-tube resonators having unpartitioned cavities ” J. Acoust. Soc. Am., vol. Vol. 64, No. 1, pp. 207-215, 1978. [8] D. A. Blaser, and J.Y.Chung., “A transfer function technique for measuring the acoustic characteristics of duct systems with mean flow,” Proc.Inter-Noise78, pp. 901-908, 1978. [9] 許時斌, “同心管共鳴型消音器之研究,” 應用力學研究所, 台灣大學, 台北, 1997. [10] 陳成, “市售消音器之消音性能實驗研究,” 造船及海洋工程研究所, 台灣大學, 台北, 1999. [11] 蘇宜昌, “排氣管對引擎性能及噪音之影響,” 機械工程研究所, 台灣大學, 台北, 2001. [12] 黃丕佑, “直通式消音器之分析研究,” 造船及海洋工程研究所, 台灣大學, 台北, 2001. [13] 潘雷, “管路複合式噪音控制之研究,” 機電工程研究所, 華梵大學, 台北, 2003. [14] W. Desmet, and M. Tournour, “LMS International,” Numerical Acoustics Theoretical Manual, 2000. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/17507 | - |
| dc.description.abstract | 本研究主要探討，當聲音經過槽孔結構時，槽孔相關的幾何參數對聲音衰減的影響。因此本文希望以模擬軟體為平台，孔徑大小為參數，設計出一可變孔徑的共鳴型消音器，其功能端視環境需求，藉由旋轉內管來改變孔隙率，以得到不同的最高消音頻率及頻帶範圍。
本研究利用聲場模擬軟體，針對槽孔型圓管進行非耦合情況下之穩態流場 ，進行模擬計算分析。假定流體為理想非黏性介質，聲音在管道中以平面波傳遞，將模擬數據、J.W. Sullivan and M. J. Crocker文獻以及一簡單型槽孔消音器之實驗結果做比較，以驗證模擬軟體之可靠度。 根據上述成果，本研究持續對不同孔隙率之消音能力進行模擬分析，顯示孔隙率越高消音頻帶越往高頻移動，且當孔隙率超過約30%時，整體的消音頻帶的移動趨勢漸緩。 本文之研究結果顯示，依據所需消音頻帶，透過模擬軟體可計算出適當之孔隙率，並設計出多種配合的可變孔徑之共鳴型消音器，而達到不同噪音環境的最佳消音效果。 | zh_TW |
| dc.description.abstract | This study is to examine the influence of structure parameters on the acoustic attenuation when the air passes through perforated muffler. Therefore this dissertation thesis is hopefully to use simulation package as basis and the perforation aperture of silencer as parameter to design some resonant muffler with variable-aperture such that its function can match the environmental requirements. Accordingly it is possible to determine the frequencies and the frequency criteria at extremely acoustic attenuation by turning inner duct to change the corresponding porosity.
This study is to use the acoustic simulation software-LMS Virtual.Lab to make acoustic simulation on a perforated duct in a uncoupled steady fluid flow. Here, the fluid flow is assumed to be ideal and non-viscous, and the plane wave propagation in duct is also assumed. To verify the reliability of simulation software, the comparison of the simulation results with that of study worked out by J.W. Sullivan and M. J. Crocker is also made in this study. Based on the results as obtained, this study continually makes simulation in progress on the acoustic performance of silencer with various porosities. The corresponding result clearly shows the frequency at the extreme attenuation shifts higher for greater porosity of perforation. The above situation will become more smoothly when the perforated porosity of silencer is greater than 30%. The result of the dissertation thesis is clearly to show that it is possible to calculate by using acoustic simulation software an appropriate porosity of perforated silencer for some required performance at the expected frequency. Accordingly, the design of resonant muffler for changeable perforation to reach extremely acoustic attenuation in various environments can be expectant. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T00:17:20Z (GMT). No. of bitstreams: 1 ntu-102-R00525063-1.pdf: 5295010 bytes, checksum: cace09fb9e4c7bc7840d1a9045f4f89a (MD5) Previous issue date: 2013 | en |
| dc.description.tableofcontents | 誌謝 I
摘要 III ABSTRACT IV 目錄 VI 圖目錄 VIII 表目錄 X 第一章 緒論 1 1-1前言 1 1-2研究目的與方法 3 1-3論文架構 4 第二章 理論與文獻回顧 5 2-1研究背景 5 2-1-1消音器的定義 5 2-1-2消音器的類型 5 2-1-3消音能力指標 6 2-2文獻回顧 11 2-3聲學波動方程式 13 2-3-1 聲波連續方程式 13 2-3-2聲波的運動方程式 15 2-3-3 聲波的狀態方程(Equation of state) 16 2-3-4 聲波的波動方程 16 2-4聲學有限元素法 18 2-5邊界條件 19 第三章 模擬參數與文獻驗證 21 3-1研究方法 21 3-1-1傳遞導納(Transfer Admittance)引言 21 3-1-2傳遞導納理論(Transfer Admittance Theory) 23 3-2網格要求 26 3-3文獻驗證 29 第四章 材料與方法 35 4-1研究方法 35 4-2實驗設備 35 4-2-1簡單型共鳴型與可變孔徑消音器規格 35 4-2-2測試方法與設備 37 4-3測量結果與分析 40 第五章 模擬結果與實驗分析 42 5-1模擬計算結果討論 42 5-2實驗結果討論 46 第六章 結論與建議 49 6-1結論 49 6-2未來展望 50 參考文獻 51 | |
| dc.language.iso | zh-TW | |
| dc.title | 可變孔徑槽孔型設計於管道聲場內消音性能分析 | zh_TW |
| dc.title | Analysis on the Acoustic Performance for the Changeable Aperture Design in Duct | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 101-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 柯文俊,周俊宏,張淑華 | |
| dc.subject.keyword | 傳遞損失,共鳴型消音器,孔隙率,有限元素法,可變孔徑, | zh_TW |
| dc.subject.keyword | transmission loss,resonant muffler,porosity,finite element method,variable-aperture, | en |
| dc.relation.page | 51 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2013-07-29 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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