指導教授：羅俊雄臺灣大學：土木工程學研究所黃昱婷Huang, Yu-TingYu-TingHuang2014-11-252018-07-092014-11-252018-07-092014http://ntur.lib.ntu.edu.tw//handle/246246/260868本研究是針對實驗式大小風機進行實驗且加以分析其動態反應，使用兩種形式的風扇葉片(無破壞葉片和破壞葉片) ，並且利用馬達轉動控制轉速以及外加地震力作用。針對葉片振動情形本研究使用兩種不同量測方法(1)接觸式量測，(加速度計和應變計)，(2)非接觸式量測(影像處理)影像量測在經過相機校正抓取控制點和立體三角定位之後可以得到葉片上控制點在風扇轉動時的三維軌跡，影像量測造成的誤差也會在文中討論。另外一方面藉由接觸式方法可以量測葉片在旋轉時的振動情形，並且利用Rodrigues’旋轉矩陣，經過一連串座標轉換，可以分離轉速頻率和葉片自然頻率，也可以得到葉片裝置的幾何情形。The objective of this study was to validate modal analysis and system identification of an operating, small-scale, wind turbine system in the laboratory. In general, wind turbine blades were instrumented with accelerometers and strain gages, and data acquisition was achieved using a prototype wireless sensing system. In this study, an experiment was designed to control the rotation of wind turbine blades in the lab. In order to control the excitation (rotation of the wind blade), a motor was used to spin the blades at controlled angular velocities. Sensors were installed onto two different representative and metallic wind blades (i.e., damaged versus undamaged blade). Data measured by the contact sensors (accelerometers and strain gages) and the photographic images (camera) were recorded while the blade was operated at different speeds. First, to analyze the displacement/motion of the turbine blade, a photogrammetric approach was used. After 3D calibration of the imaging system, 3D positions are calculated using a stereo triangulation technique and digital images taken to track the 3D motion of the blade. Image measurement error induced by image analysis error and camera synchronization error was discussed. Second, the dynamic characteristics of the rotating blade were investigated. The Rodrigues’ rotation was applied to the data to extract the vibration signal due to rotation. Separation of the turbine blade natural frequencies and the rotating frequency can successfully be carried out. From which the residual signal can be used to identify the dynamic characteristics of turbine blade. Dynamic characteristic of undamaged and damage turbine blade was investigated.CONTENTS 口試委員會審定書 # 誌謝 i 中文摘要 ii CONTENTS iv LIST OF FIGURES vi LIST OF TABLES xiii 第一章 導論 1 1.1 研究背景與動機 1 1.2 文獻回顧 2 1.3 本文所有章節主要內容概述 2 第二章 實驗配置 4 2.1 實驗配置 4 2.2 風機影像量測實驗 5 2.3 風機加速度計量測實驗 6 2.4 同步系統 7 第三章 應用方法與原理 8 3.1 風機旋轉葉片之基本動態行為 8 3.2 影像量測方法 10 3.2.1 相機校正 11 3.2.2 控制點定位 12 3.2.3 控制點追蹤 12 3.3 傅立葉轉換與快速傅立葉轉換 14 3.3.1 傅立葉轉換 14 3.3.2 快速傅立葉轉換 14 3.4 Rodrigues’ rotation formula 座標轉換 15 3.5 奇異譜分析 (Singular Spectrum Analysis) 18 第四章 實驗結果與分析 20 4.1 影像量測方法實驗結果 20 4.1.1 試驗案例 20 4.1.2 小尺寸風機影像量測結果分析 20 4.1.3 大尺寸風機影像量測結果分析 24 4.2 三軸加速度計方法實驗結果 25 4.2.1 三軸加速度計試驗案例 25 4.2.2 小尺寸風機三軸加速度計結果 25 4.2.3 大尺寸風機三軸加速度計結果 27 4.2.4 多角度風機三軸加速度計結果 28 4.3 不同量測方法比較 29 第五章 結論與未來展望 30 5.1 結論 30 5.2 未來展望 31 參考文獻 343841975 bytesapplication/pdf論文公開時間：2015/07/29論文使用權限：同意無償授權訊號處理影像量測影像校正Rodrigues’旋轉矩陣thesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/260868/1/ntu-103-R01521228-1.pdf