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研究生:向麗瑾
研究生(外文):Hsiang,Li-Chin
論文名稱:方形微型揚聲器系統之有限元素分析
論文名稱(外文):The Finite Element Analysis of the Rectangle Micro-Speakers System
指導教授:劉興華劉興華引用關係
口試委員:吳明川,王能治
口試日期:2016-06-30
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:車輛工程系所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
畢業學年度:104
中文關鍵詞:微型揚聲器、有限元素分析
外文關鍵詞:Micro-SpeakersFinite Element Analysis
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現今的3C產品,皆傾向於短、小、輕、薄的趨勢,其音效性能也日益受到重視,因此微型揚聲器也是重要的元件之一。本論文以現今最常使用於手機、平板中的方形微型揚聲器作為實驗及模擬對象,並且進行微型揚聲器之空間設計,包括改變前、後音腔之容積大小、改變開孔率、出音口偏移及不同的側出音結構等條件,進行實驗及模擬分析,了解這些設計對於微型揚聲器之聲音表現有何影響。
本論文使用之模擬軟體為COMSOL Multiphysics多重物理耦合軟體,選用其中之聲學模組,匯入此微型揚聲器之3D模型,並輸入其T-S參數,對物理邊界條件加以設定。模擬出其頻率響應曲線及聲場分布狀況。而實驗則以CLIO系統量測,量測區間從20 Hz到20k Hz,麥克風在距離微型揚聲器10公分處量測其頻率響應。而最後所得到之模擬結果與實際量測值相當吻合,對於未來產品的開發更能提升效率及準確的預測聲音表現。
In this paper, we used the rectangle micro-speakers to simulate and measure. Changing the enclosure (front and rear) volume, open rate, open hole migrated position and different kinds of sound hole on the side surface.
Choosing the acoustic modules of COMSOL Multiphysics to simulate the sound pressure level. Imported 3D model and T-S parameter of this micro-speaker. Simulating sound pressure level and sound field. In the measurement section, using CLIO and give the frequency 20 Hz to 20k Hz. The microphone is placed in front of the micro-speaker 10 cm. The measurement and simulation results are in good agreement. So these analysis method are available to be the reference. It can reduce the time and cost when designing the speakers..
摘要 i
ABSTRACT ii
誌 謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究動機 2
1.3 文獻回顧 3
1.4 論文大綱 5
第二章 相關理論 6
2.1 揚聲器基本介紹 6
2.2 類比電路分析法 8
2.3 揚聲器電路模型 10
2.4 T-S參數 12
2.5 無限大隔板理論 15
2.5.1 活塞於無限大隔板中的理論 15
2.5.2 無限大隔板於機械阻抗中的理論 17
2.5.3 無限大隔板於聲學阻抗中的理論 18
2.5.4 無限大隔板的軸向聲壓計算 19
2.6 有限元素法 20
第三章 研究方法 21
3.1 方形微型揚聲器介紹 21
3.2 多重物理耦合軟體COMSOL Multiphysics 22
3.3 COMSOL 模擬流程 23
3.4 量測方法 25
3.5 實驗環境 28
3.6 實驗設備 29
3.6.1 功率放大器 29
3.6.2. 電聲綜合分析系統 30
3.6.3. 聲壓校正器 31
3.6.4 麥克風訊號放大器 31
3.6.5. 電容式麥克風 32
第四章 實驗結果與討論 33
4.1 改變後音腔之容積大小 34
4.2 改變出音口百分比 40
4.3 改變前音腔容積 49
4.3.1 固定開孔率為50% 50
4.3.2 固定開孔率為100% 52
4.3.3 開孔率50 %與100 %之比較 55
4.4 出音孔偏移 56
4.5 改變側出音結構 62
第五章 結論與未來展望 69
5.1 結論 69
5.2 未來展望 71
參考文獻 72
1.G. Bell, US Patent No. 174465, 1876.
2.陳文華,實用揚聲器技術,台北 : 文笙書局,1979,P 9-11。
3.E. W. Siemens, German Patent, No. 2355, 1877.
4.O. J. Lodge British patent, No. 9712, April 27th, 1898.
5.A. N. Thiele, "Loudspeakers in Vented Boxes: Part I and II," Australia, vol.22, 1961, pp.487-508.
6.R. H. Small, "Direct-Radiator Loudspeaker System Analysis," IEEE Transactions on Audio and Electroacoustics, AU-19, 1971, pp.269-281.
7.J. Borwich, Loudspeaker and Headphone Handbook, SecondEdition, London: FocalPress, 1994.
8.S. J. Pawar, H. C. Her and J. H. Huang, "Parametric simulation study of miniature loudspeaker for performance evaluation and improvement," 2010.
9.Y. C. Shiah, H. C. Her, J. H. Huang and B. Huang, "Parametric analysis for a miniature loudspeaker used in cellular phone," 2008.
10.G. Pellerin, J. D. Polack and J. P. Morkerken, "Finite element methods and equivalent electrical models for loudspeaker characterization,"114th Convention of The Audio Engineering Society, Amsterdam, March, 2003.
11.M. R. Bai, R. L. Chen and C. J. Wang, "Electroacoustic analysis of an electret loudspeaker using combined finite-element and lumped-parameter models," J. Acoust. Soc. Am. 125, 3632–3640, 2009.
12.K. Matti, I. Veijo, A. Poju, M. Panu, S. Lauri, S. Antti and P. Seppo,
"Comparison of Numerical Simulation Models and Measured Low-Frequency Behavior of Loudspeaker Enclosures," Journal of Audio Engineering Society, 2001.
13.R. Lerch, M. Kaltenabcher, H. Landes, M. Rausch and P. C. Eccardt, "Combination of Finite Element and Boundary Element Method in Computational Acoustic an Coupled Field Problems of electro-Acoustic Transducer," Edito: von Estorff, Corn-putational Mechanics Publivation, 2000.
14.C. H. Choi, H. S. Yoon, "Acoustic and Vibration Characteristics of a Micro Speaker through the Electro-Magnetic field Analysis," in The 32nd International Congress and Exposition on Noise Control Engineering, Aug. 2003.
15.S. H. Lee, J. H. Kim, J. T. Kim, O. S. Kwon and C. H. Choi, "Development of the simulation program to analyze acoustic characteristics of a miniature type loudspeaker," in The 32nd International Congress and Exposition on Noise Control Engineering, Aug. 2003.
16.R. Clough, "Variational Mehodes for the Solutions of Problems of Equilibrium and Vibrations," Bull. Am. Math. Soc, Vol. 49, 1943.
17.R. W. Clough, "The Finite Element Method in Plane Stress Analysis" Proceedings of 2nd ASCE Conference on Electronic Computation, September 8 and 9, 1960.
18.M. N. O. Sadiku, Elements of electromagnetics, New York: Oxford University Press, 2001.
19.J. D. Irwin, Basic Engineering Circuit Analysis, Seventh Edition, New York:John Wiley & Sons, 2002, pp.121-131.
20.W. M. Leach, Jr., Introduction to Electroacoustics and Audio Amplifier Design, Third Edition, 2003, pp.86 – 94.
21.W. M. Leach, Jr., Introduction to Electroacoustics and Audio Amplifier Design, Third Edition, 2003, pp.43 – 44.
22.W. M. Leach, Jr., Introduction to Electroacoustics and Audio Amplifier Design, Third Edition, 2003, pp.6.
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