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研究生:洪春三
研究生(外文):Hong,Chun-San
論文名稱:銅質U管型科氏質量流率計之分析與實驗
論文名稱(外文):Analysis and Experiment of a Copper U Tube Coriolis Mass Flowmeter
指導教授:劉思正劉思正引用關係
指導教授(外文):Liu,Hsu-Jeng
學位類別:碩士
校院名稱:國立屏東科技大學
系所名稱:機械工程系
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:2006
畢業學年度:94
語文別:中文
論文頁數:65
中文關鍵詞:科氏質量流率計科氏頻率數位濾波器快速傅利葉轉換
外文關鍵詞:Coriolis mass flowmeterCoriolis frequencydigital filterfast Fourier transform
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本論文在分析、設計,並製作出一台銅質U管型科氏質量流率計科氏質量流率計之實驗平台。論文中首先討論科氏質量流率計的理論及實驗設計;接著使用有限元素分析法及實驗模態分析法來分析一銅質U型管的模態分析,藉此找出銅質U型管的科氏頻率以進行激振。再藉由裝設在管路的最佳處,裝置光纖反射位移計量測訊號,經過LabVIEW的界面之數位濾波器和快速傅利葉轉換的訊號處理之後,即可進行質量流率的量測與訊號分析。質量流率實驗結果顯示以第一個模態振型激振時系統的誤差值介於1.0%~1.5%之間,而此結果確定以第一個模態振型激振可提升準確度。且也證明設計的Labview界面,它利用數位濾波器和快速傅利葉轉換,確實能排除干擾,讓我們能非常迅速尋找到相位差,加以確定與質量流率的關係。
This thesis are analyzing, designing, and building a copper U tube Coriolis mass flowmeter. First, we present the theory and the experimental design of the Coriolis mass flowmeter in the thesis, and Applying Finite Element Analysis and Experiment Modal Analysis to analyze the U shape copper tube’s modal analysis, and to find the Coriolis frequency for excitability. To measure the signal by optical fiber catoptrics displacement meter that is mounted at best place of the tube, after LabVIEW interface for digital filter and fast Fourier transform signal processing, we can measure the mass flow rate and signal analysis immediately. Through experiments, we find when the U tube Coriolis mass flowmeter was excited with 1st vibration mode the errors are between 1.0% and 1.5%, to excited with 1st vibration mode can improve accuracy. To prove the Labview interface of the design, it utilizes the digital filter and fast Fourier transform, really it can have got rid of interference. Enable us to look phase difference for very fast, confirm the relation with mass flow rate .
目錄

摘要………………………………………………………………………I
英文摘要……………………………………………………………………II
誌謝…………………………………………………………………………III
目錄…………………………………………………………………………Ⅳ
表目錄………………………………………………………………Ⅵ
圖目錄………………………………………………………………………Ⅶ
符號索引………………………………………………………………………………Ⅹ
第一章 序論…………………………………………………………………1
1.1 研究動機………………………………………………………1
1.2 文獻回顧………………………………………………………2
1.3 論文結構……………………………………………………5

第二章 科氏質量流量計之理論與實驗設計………………………………6
2.1 前言…………………………………………………………6
2.2 科氏質量流率計之理論……………………………………6
2.3 科氏質量流率計之硬體架構……………………………10
2.3.1 流體管路……………………………………………10
2.3.2 感測器………………………………………………10
2.3.3 刺激線圈……………………………………………13
2.3.4 固定基座……………………………………………13
2.3.5 電腦週邊設備………………………………………14
2.4 科氏質量流率計之實驗流程……………………………19

第三章 銅質U型管之分析與實驗模態………………………………21
3.1 前言………………………………………………………21
3.2 ANSYS有限元素分析………………………………21
3.2.1 問題定義………………………………………………21
3.2.2 分析目標……………………………………………22

3.2.3 數學模型…………………………………………22
3.2.4 建構有限元素模型…………………………………22
3.2.5 分析結果…………………………………………24
3.3自然頻率之實驗模態分析………………………………28

第四章 質量流率之量測實驗…………………………………………32
4.1 前言……………………………………………………32
4.2 建構訊號產生……………………………………………32
4.3 訊號處理與分析…………………………………37
4.3.1 離散傅利葉轉換………………………………………37
4.3.2 快速傅利葉轉換.……………………………………39
4.3.3 數位濾波器之設計……………………………………42
4.4 質量流率量測實驗………………………………………50

第五章 結果討論與未來展望……………………………………………59
5.1結果討論……………………………………………………59
5.2未來研究及展望……………………………………………61

參考文獻…………………………………………………………………62
作者簡介及著作……………………………………………………65
參考文獻

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