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研究生:卓海明
研究生(外文):CHO HAI MING
論文名稱:活塞聲源覆蓋多孔質吸音材料之聲場研究
論文名稱(外文):A study on the sound field of a baffled piston source covered by a porous material
指導教授:王 昭 男
指導教授(外文):Wang Chao- Nan
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:造船及海洋工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:中文
論文頁數:97
中文關鍵詞:吸音材料活塞聲源非等向性
外文關鍵詞:porousmaterialbaffled piston sourceanisotrpic
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由於一般在求吸音材料之特性時,理論上皆假設材料為均質、等向,然而事實上吸音材料多皆為非均質、非等向,故本文之理論推導特別將材料之非等向性考慮在內,並以圓柱波法(Cylindricalwave)為理論基礎,利用其導得活塞聲源覆蓋非等向性多孔質吸音材料時之聲場模擬公式,首先假設材料為等向性來進行分析,並與Amedin等人[10]之研究結果作比較,以資驗證模擬公式之正確性,並以電腦程式Frotran 90之數值方法來分析活塞聲源覆蓋不同之多孔質吸音材料時之聲場,在此分別考慮聲源頻率、材料密度、材料之非等向性對壓力傳輸函數之影響。

When generally seeking for the characterizations of the absorbent materials ,we all presume that the material is homogeneous and isotropic in theory. However ,the fact is that absorbent material is almost nonhomogeneous and anisotropic ,so the theory of this article especially includes the anisotropy of the material ,and the theoretical foundation is based on the cylindrical wave decomposition method. We make use of cylindrical wave decomposition method to gain the simulant formulation of the sound field of a baffled piston source covered by the anisotropic material. In the first place ,we suppose that the material is isotropic and proceed to make analysis. We compare the results with the study doing by
C.K.Amedin[10] in order to prove the exactness of the simulant
formulation and use the numerical methods of the computer software (Frotran 90) to analyze the sound field of a baffled piston source covered by the various materials. We also consider respectively the influence of pressure transfer function making by the frequency of acoustic source,density of material,and anisotropy of the materials.

第一章 導論 1
_______________________________________________________________
1-1 前言 1
1-2 多孔質吸音材料之簡介 2
1-3 文獻回顧 5
1-4 研究目的與方法 7
第二章 聲場模擬之理論分析 8
_______________________________________________________________
2-1 控制方程式 9
2-2 圓柱波法分析聲場 11
2-3 傳輸函數理論分析 22
第三章 聲場模擬之數值計算 23
_______________________________________________________________
3-1 聲場模擬之驗證 24
3-2 聲源頻率對傳輸函數之影響 31
3-3 材料密度對傳輸函數之影響 49
3-4 材料之非等向性對傳輸函數之影響 72
第四章 結論與未來研究方向 93
_______________________________________________________________
4-1 結論 93
4-2 未來研究方向 94
參考文獻 95

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