臺灣博碩士論文加值系統

本論文應用二維麥克風陣列量測音源之聲場（sound field）資料、經由空間轉換（spatial tranformation）之技巧，搭配Lms公司出版的Cada-x軟體裡的“Acoustic Holography analysis”去推算整個三維空間聲源表面聲場資料，如近場聲壓、聲強，或遠場聲壓、聲強。
為了驗證整個實驗搭配軟體的可行性，進而應用在結構物音源上的辨識等。因此本實驗將透過循序漸進方式，來驗證理論並且了解辨識噪音源的位置、強度、分佈特性。其主要分成三部分：一、無響室固定單一聲源：無指向性喇叭、電腦風扇驗證它的音源分佈位置；二、無響室固定多重音源：用兩聲源無指向性喇叭和平面喇叭驗證它的音源分佈位置；三、汽車輪胎部分：利用激振器方式，了解整個輪胎面輻射音場分佈；另一方法利用滾輪帶動汽車輪胎，了解輪胎面音源分佈特性。
從整個研究結果顯示，聲音全像術辨識音源相當正確，因此對於噪音源的辨識方面，它是一種很有效的方法。

In this thesis, the acoustic field data is measured on a two dimensional microphones array close to the noise source. By spatial transformation, three dimensional space sound field data, such as near-field sound pressure, near-field sound intensity, far-field sound pressure, and far-field sound intensity can be calculated, with “Acoustic Holography Analysis” of Lms’ software “Cada-x”.
First, in order to make sure that all experimentation collocate software are practicable, and the application in structure noise source identification. Therefore the experiment process is step by step generally, then the location, intensity, and distribution property of noise source will be proved and discussed. This thesis divide into three parts：(1) A stationary single sound source in the anechoic room：use a isotropic speaker, and a fan of computer for the provement in source distribution location. (2) Stationary multiple sound sources in the anechoic room：identify the location of noise sources by isotropic speaker and plane speaker. (3) The tires of the car：The acoustic radiation from the tire surface can be predicted by using sharker；Besides, the distribution property of the noise sources on the tire surface can be identify by operating the tires in the roller belt.
For all study results show, Acoustic Holography identify noise sources are quite correct. Therefore noise source identification dimension, it is very effective ways.

目 錄
中文摘要 I
英文摘要 II
目錄 III
圖目錄 V
第一章 緒論 1
1.1. 緒言 1
1.2. 發展過程 1
1.3. 研究動機與目的 3
1.4. 各章節內容之概述……………………………………………………………………3
第二章 聲音全像術 4
2.1. 基本定義 4
2.2. 近場聲音全像術理論 10
第三章 實驗設計步驟 17
3.1. 實驗設計步驟 17
3.2. 無響室固定單一聲音源 17
3.2.1 利用無指向性喇叭 17
3.2.2 利用電腦散熱風扇 24
3.3. 無響室固定音源：利用多重聲源 28
3.4. 汽車輪胎聲音全像術實驗部份 33
3.4.1利用激振器激振模式 33
3.4.2利用滾輪帶動模式 35
第四章 實驗結果與分析 44
4.1. 無響室固定單一聲音源 44
4.1.1 利用無指向性啦叭 44
4.1.2 利用電腦散熱風扇 51
4.2. 無響室固定多重音源 72
4.3. 汽車輪胎聲音全像術實驗分析結果 79
4.3.1 利用激振模式 79
4.3.2 利用滾輪帶動模式 87
第五章 結論與未來研究方向 130
5.1. 結論 130
5.2. 未來研究方向 131
參考文獻 132

參考文獻
1. Graham, T. S. , “Long Wavelength Acoustic Holography,”Doctoral dissertation, The Pennsylvania State Univeristy, 1969.
2. Waston, E. E. , “Dection of Sound Radiation From Plates Using Long Wavelength Acoustical Holography,”Doctoral dissertation, The Pennsylvania State University, 1971.
3. E. G. Williams, J. D. Maynard and E. Skudrzyk, “Sound source reconstruction using a microphone array, Journal of the Acoustical Society of America,”Vol.68, No.1, pp.340-344, 1980.
4. J. D. Maynard, E. G. Williams and Y Lee, “Nearfield acoustic holography：Ⅰ Theory of generalized holography and the development of NAH,” Journal of the Acoustical Society of America, Vol.78, No.4, pp.1395-14133, 1985.
5. W.A. Veronesi and J. D. Maynard, “Nearfield acoustic holography（NAH） Ⅱ.Holographic reconstruction algorithms and computer implementation,” Jouranl of the Acoustical Society of America, Vol.81, No.5, pp.1307-11322, 1987.
6. J. Hald and K. B. Ginn, “Spatial Transformation of Sound Fields： principle, instrumentation and applications, Acoustic Intensity Symposium,” Tokyo, 1987.
7. J.Hald and K. B. Ginn, “Vehicle Noise Investigation Using Spatial Transformation of Sound Fields,” Sound and Vibration, pp.38-45, 1989.
8. “STSF- A Unique Technique for Scan-based Near-field Acoustic Holography without Restrictions on Coherence,”B&K Technical Review, No.2, 1989.
9. “STSF- Practical Instraumentation and Application Digital Filter Analysis： Real-time and Non Real-time Performance,”B&K Technical Review, No.2, 1989.
10. T. Loyau, Jean-Claude Pascal and P. Gaillard,“Broadband acoustic holography reconstruction from acoustic intensity measurement. Ⅰ：principle of the method,” Journal of the Acoustical Society of America, Vol.84, No.5, pp.1744-1750, 1988.
11. J. A. Mann Ⅲ and Jean-Claude Pascal, “Nosie Sources on an Industraical Air Compressor Using Broadband Acoustical Holography from Intensity Measurements（BAHIM）,” Noise Control Engineering, Vol.39, No.1, pp3-12, 1992.
12. Filip Van Grembergen, “Acoustic Holography- Mercedes c220 & Mercedes SL280,” 8-19 January 1996.
13. R. Van Cauter, F. Van Grembergen and P. Van de Ponseele, “A tool for noise source identification and quantification,” Lms International, Interleuvenlaan 68, 3001 Heverlee.
14. 白明憲, “聲學裡論與應用,”全華科技圖書股份有限公司,1999.
15. 王一安, “近場聲音全像術應用於聲場輻射分析技術之改進研究,”國立交 通大學機械工程研究所碩士論文, 80年6月.
16. 湯耀期, “無響室室內隔音牆性能特性分析與實例, “國立台灣海洋大學系統工程暨造船研究所碩士論文,” 89年5月.
17. Renaat Van Cauter, “Noise source identification and quantification using the acoustic holography technigue,” Lms international.
18. Earl G.. Williams. “Fourier Acoustic： Sound Radiation and Nearfield Acoustical Holography,” San Diego Academic Press, 1999.