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論文中文名稱:影像分析在風機葉片結構振動特性之量測應用 [以論文名稱查詢館藏系統]
論文英文名稱:The Measurement Applications of Image Analysis at Structure Vibration Properties of Wind Turbine Blade [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:工程學院
系所名稱:土木工程系土木與防災碩士班
畢業學年度:105
畢業學期:第一學期
出版年度:105
中文姓名:鄭翔駿
英文姓名:Siang-Jyun Jheng
研究生學號:103428091
學位類別:碩士
語文別:中文
口試日期:2017/01/16
論文頁數:104
指導教授中文名:楊元森
指導教授英文名:Yuan-Sen Yang
口試委員中文名:羅俊雄;許丁友
中文關鍵詞:影像量測濾波時頻分析奇異頻譜分析小波包轉換
英文關鍵詞:Image-based MeasurementfilteringTime-Frequency AnalysisSingular Spectrum AnalysisWavelet Packet Transform
論文中文摘要:在風機葉片振動量測中,接觸式感應器在安裝上的各種限制,例如訊號線容易受拉扯、無線式感應器供電問題等,都會造成量測的不便。雖然影像量測技術日漸成熟,但是要在大範圍的旋轉運動中量測風機葉片的微小振動並不容易。此外,實驗過程中仍存在著很多難以抗拒的外在因素,例如光線不穩定等造成實驗資料充斥著各式各樣的雜訊。這些雜訊的影響甚至大於葉片本身的振動量,使得後續的訊號分析相當不容易。
為了分析量測到的振動資料,本研究將擷取到的影像資料做影像處理及訊號分析。在影像分析方面,本研究採用相機影像校正、模板比對、三角定位、座標轉換等。在訊號分析方面,本研究透過濾波、奇異頻譜分析(SSA)與小波包轉換(WPT),濾除雜訊以找出目標結構物振動的頻率,並利用這些資料來達到結構健康監控之效。本研究並發現利用影像分析會出現倍頻訊號,而本研究認為它並不是結構振動的現象。本論文呈現這些倍頻現象並解釋倍頻現象發生的原因。
論文英文摘要:In the measurement of wind turbine blade vibration, various restrictions on the installation of contact sensors. Such as the signal line is easy to be pulled, wireless sensor power supply problems will cause measurement inconvenience. Although the image measurement technology is maturing, it’s not easy to measure small vibrations of fan blades in a wide range of rotation motion. In addition, the experimental processes still have a lot of irresistible external factors, such as light instability caused by experimental data is full of all kinds of noise. The noise is even greater than the vibration of the blade. The condition make the subsequent signal analysis is not easy.
In order to analyze the measured vibration data, this study will capture the image data to do image processing and signal analysis. In the image analysis, this study uses camera image calibration, template matching, triangulation, coordinate transformation and so on. In the study, the frequency of the vibration of the target structure was found by filtering, Singular Spectrum Analysis (SSA) and Wavelet Packet Transform(WPT), filter out noise to find the frequency of vibration of the target structure and use these data to achieve the effect of structural health monitoring. The study also found that the use of image analysis will appear signals of multiple frequencies. And the study considers that it is not the phenomenon of structural vibration. This paper presents these multiple frequency phenomena and explains the cause of the multiplication phenomenon.
論文目次:摘 要 i
ABSTRACT ii
誌 謝 iv
目 錄 v
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 1
1.3 研究方法 2
1.4 論文架構 2
第二章 相關技術文獻回顧與初步測試 3
2.1 短時間傅立葉轉換 3
2.2 奇異頻譜分析 4
2.3 小波轉換分析 5
2.4 影像分析的初步測試 7
2.4.1 橋樑結構變形量測 7
2.4.1.1 程式面板操作方式說明 8
2.4.2 奈米碳管影像辨識與分析 9
第三章 風機葉片實驗與分析流程 11
3.1 基本流程介紹 11
3.2 相機校正 12
3.3 樣板比對 14
3.4 濾波器 15
3.5 三角定位 16
3.6 座標轉換 17
第四章 風機葉片振動量測實驗 18
4.1 風機葉片自由振動實驗 18
4.2 風機旋轉葉片振動實驗 19
4.3 風機葉片自由振動實驗量測結果 23
4.4 風機旋轉葉片振動實驗影像分析結果 24
4.5 自由振動及風機旋轉實驗之結果分析與比較 31
第五章 風機旋轉運動之倍頻現象 33
5.1 影像分析所發現到的倍頻現象 33
5.2 影像分析結果與有線式加速規量測結果比較 45
第六章 結論 53
參考文獻 55
附錄 58
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論文全文使用權限:同意授權於2017-02-10起公開