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研究生:李兆安
研究生(外文):Lee ,Chao An
論文名稱:移動音源之聲功率量測與音場特性分析
論文名稱(外文):The Sound Power Measurement and The Sound Property Analysis of The Sound Field under Moving Sound Sources
指導教授:劉德源劉德源引用關係
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:系統工程暨造船學系
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:2002
畢業學年度:90
語文別:中文
論文頁數:116
中文關鍵詞:移動音源聲功率量測音源信號識別音場特性Raynoise
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本文主要研究目標是探討移動音源的聲功率量測估算方式以及分析移動音源作用下音場變化。用以解決現場噪音環境音源在移動時聲功率的量測困難,和軟體模擬分析時需要輸入正確的音源聲功率大小作為分析的依據。文中並探討音源在移動和固定這兩種不同的狀態下,聲功率的變化情形。
首先使用理論配合實驗測量移動音源的聲音強度來計算移動音源聲功率位準,另外,再利用音源移動時由固定觀測點量得的聲壓資料作為模擬軟體Raynoise 3.0反求聲功率的依據以求得結果,還有依照ISO國際標準測量聲功率的規範進行聲功率的量測,並將上述結果進行比較。同時也探討移動音源的遠場輻射聲壓和位置與時間的關係,並由實驗與理論作相互的印證。
本文將測得的聲功率輸入模擬軟體中作實際應用分析,以得到防音牆架設前後的效果。文中並嘗試使用偏相關識別法對合成的信號作識別,對於簡單的信號識別已經得到初步的成果。
The study purpose of this text is to probe the the sound power measurement and the sound property analysis of the sound field under moving sound sources. To solve the difficulties of surveying sound power when the noise source is moving and input the correct sound power value of source when analyzing or simulation by softwear.
This text also researches the changes of sound power when the source in moving and fixing situation.
First, we use the theory and a sound intensity test to calculate the sound power level of the moving source. Besides, when the source is moving, making use of the sound pressure data which can be a basis to find the result of sound power in Raynoise 3.0, and compare the result with ISO. In the meanwhile, we can also find the sound pressure and site of moving source which is connection with theory each other.
In this text, we analyze the date of the sound power which is input simulated software, so we can obtain the effect when the sound wall to be set up before and after. We also try to use modified coherence function to reconstruct the mixed signals. And we got elementary achievement in distinguishing a simple signal.
目錄
中文摘要…………………………………………………………………….I
英文摘要…………………………………………………………………...Ⅱ
目錄…………………………...…………………………………………... Ⅲ
圖目錄…………………………………………………………………..….Ⅴ
表目錄…………………………………………..………..……………...ⅩⅡ
第一章 緒論
1.1研究目的與動機……………………………………………………...1
1.2文章架構……………………………………………………………...2
第二章 音源之聲功率量測
2.1移動音源之聲功率量測理論………………………………………...3
2.2固定音源之聲功率量測規範………………………………………...5
2.3聲場設計模擬軟體Raynoise 3.0介紹………….………………..11
第三章 音源信號的識別
3.1移動噪音源識別之目的……………………………………………15
3.2噪音源的一般識別方法……………………………………………16
3.3相關函數(Coherence Function)分析……………………………17
3.3.1常相關音源信號識別法……………………………………..17
3.3.2偏相關音源信號識別法…………………………………..…19
第四章 移動音源的傳播特性
4.1理想化的移動點音源方程式…………..…………………………21
第五章 模擬與實驗結果
5.1移動音源的製作………………………………..…………………27
5.1.1脈波調變……………..……………………………………..28
5.1.2 PCM的錄音與撥放過程…………………………………..…29
5.1.3移動音源製作過程………………………………..……..…30
5.2移動音源的聲功率量測實驗……………..………………………35
5.3固定音源之聲功率量測實驗………………………………………40
5.4聲場設計軟體Raynoise 3.0模擬移動音源聲功率………………43
5.5音源信號識別分析……………………..…………………………52
5.6移動音源聲場分析實驗與模擬……………………………………78
第六章 結果與討論
6.1結論……………………………………………………….………115
6.2展望……………………………………………………………….116
參考文獻…………………………………………………………….……117
參考文獻
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