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研究生:李彥霆
研究生(外文):Yen-TingLee
論文名稱:Helmholtz resonator 在不同驅動方式下之聲音特性
論文名稱(外文):The acoustic characteristics of Helmholtz resonator under different driving conditions
指導教授:周榮華周榮華引用關係
指導教授(外文):Jung-Hua Chou
學位類別:碩士
校院名稱:國立成功大學
系所名稱:工程科學系碩博士班
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:84
中文關鍵詞:Helmholtz共振腔噪音驅動條件噴流
外文關鍵詞:Helmholtz resonatorNoiseDriving conditionsAir jet
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近年來隨著人類對於生活品質的要求提高,噪音的問題也日益受到重視。從早期的管風琴、管弦樂器到管路、噴射引擎、汽機車排氣管或電子產品上的微共振腔,不論是產生聲音或是降低噪音,皆可發現Helmholtz共振腔的蹤跡。就產生聲音的角度來看,如果能夠降低驅動樂器的困難度,使一般民眾皆能容易的吹奏樂器或者將抑制噪音的技術用來產生特定的聲音…等等,將具有其商業潛力。
首先,本研究使用噴流在不同位置、角度下驅動共振腔,觀察共振腔之特性,搜尋較容易驅動共振腔之條件。接下來再對不同進氣口、吹口進行比較。最終,在經過一連串實驗後找出較佳的進氣口與吹口條件後,進行優化實驗。研究結果顯示,共振腔體厚度越厚,所能產生之聲音強度越高;在共振腔開口附近進行驅動將能得到穩定的頻率值與高的分貝值。另外,共振腔在增設了進氣口與吹口後,其所能夠驅動共振腔之極限頸長也增加許多,換句話說,有了進氣口與吹口的輔助,共振腔更容易被驅動。

In recent years, noise problems have been taken as an important issue with the demanding of better life quality by human beings. Applications of Helmholtz resonators on eliminating noises can be widely seen in pipelines, jet engines, tailpipes and mufflers, or even in electronic equipment. On the other hand, the beautiful sound made by organ pipes and musical instruments are based on the concept of resonator as well. As a result, we can see the potential of taking advantages of sound to different applications. For instance, players of the musical instrument can easily overcome learning barriers by decreasing the difficulty of driving musical resonators, engineers can create specific sounds by exploiting the Helmholtz resonator, etc.
In this study, we explore various driving conditions by means of air jet to drive the resonator in different locations and angles first. Then, the performance difference between mouthpieces and blowers is compared. Finally, suitable conditions of guiding mouthpieces and blowers are obtained. Accordingly, experiments show several key results: (a) The thicker of the resonator wall, the louder sound it can create; (b) Higher sound intensities and more consistent frequency values can be obtained nearby the orifice of the resonator than other places; (c) With modified blowers and mouthpieces, resonators are much easier to be driven.

摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VIII
圖目錄 IX
符號說明 XIII
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 2
1-3 文獻回顧 2
1-3-1 Helmholtz resonator 之機制 2
1-3-2 Helmholtz resonator 之應用 6
第二章 理論基礎 9
2-1 Helmholtz resonator基本理論介紹 10
第三章 實驗方法與設備 12
3-1 實驗方法與流程 12
3-2 實驗模組 15
3-2-1 開口與吹口之匹配特性 15
3-2-2 開口大小對於頻率的影響 16
3-2-3 不同材料之Helmholtz resonator特性比較 16
3-2-4 不同風速條件對Helmholtz resonator之影響 17
3-2-5 不同量測位置對Helmholtz resonator之影響 18
3-2-6 進氣口對Helmholtz resonator之影響 19
3-2-7 進氣口在不同位置角度之影響 22
3-2-8 不同吹口對 Helmholtz resonator之影響 23
3-2-9 優化實驗 25
3-3 實驗設備 26
3-3-1 電源供應器 26
3-3-2 鼓風機 27
3-3-3 麥克風 28
3-3-4 分貝計 28
3-3-5 風速儀 29
3-3-6 電子磅秤 29
3-3-7 SONY HDR-SR12 數位攝影機 30
3-3-8 筆記型電腦 30
3-3-9 ImageJ圖片量測軟體 31
第四章 結果與討論 32
4-1 實驗誤差討論 32
4-2 共振腔開口與鼓風機吹口之匹配性 34
4-3 開口大小對頻率之影響 35
4-4 不同材料對Helmholtz resonator 之影響 36
4-5 不同風速條件對Helmholtz resonator之影響 38
4-6 不同風速與量測位置對Helmholtz resonator之影響 40
4-6-1 不同風速下頻率與位置關係 40
4-6-2 不同風速下分貝與位置關係 45
4-7 不同風速與量測角度改變對Helmholtz resonator之影響 50
4-7-1 不同風速下頻率與角度關係 50
4-7-2 不同風速下分貝與角度關係 55
4-8 不同進氣口對Helmholtz resonator 之影響 59
4-8-1 由分貝與頸長極限之觀點分析不同進氣口的特點 60
4-8-2 由位置之觀點分析不同進氣口之頻率與分貝特性 62
4-9 不同吹口對Helmholtz resonator之影響 67
4-10 優化實驗 70
第五章 結論與建議 71
5-1 結論 71
5-2 建議 72
參考文獻 73
附錄 76
附錄一、水平移動之原始訊號圖 76
附錄二、垂直移動之原始訊號圖 77
附錄三、角度變化之原始訊號圖 78
附錄四、吹口與開口匹配性之原始訊號圖 79
附錄五、不同風速與位置變化之原始訊號圖 82

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