現在位置首頁 > 博碩士論文 > 詳目
  • 同意授權
論文中文名稱:廣域應變量測應用於大型風機葉片損傷診斷之研究 [以論文名稱查詢館藏系統]
論文英文名稱:A Study on Damage Detection of A 5MW Wind Turbine Blade Using Macro-Strain Measurement [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(碩士在職專班)
畢業學年度:103
畢業學期:第二學期
中文姓名:林云媚
英文姓名:Yun Mei Lin
研究生學號:102428003
學位類別:碩士
口試日期:2015/07/29
指導教授中文名:廖文義;許丁友
指導教授英文名:Wen-I Liao;Ting-Yu Hsu
口試委員中文名:廖文義;許丁友;柴駿甫;邱建國
中文關鍵詞:局部柔度法、旋轉位移模態、廣域應變、損傷指標法、葉片結構、損傷診斷
英文關鍵詞:Local Flexibility Method, Rotary Displacement Mode Shapes, Macro Strain, Damage Index Based on Modal Strain Energy, Blade Structure, Damage Detection
論文中文摘要:由於風機組件中,葉片為最具代表性之風機組件,且為風機結構中經常損傷之位置,因此本研究擬發展葉片結構損傷診斷技術。藉由量測結構模態參數的改變來進行健康診斷的研究,在近年來相當受重視。本研究應用局部柔度法進行損傷診斷,其優點為僅需要使用少量之結構振動模態便可診斷結構物的損傷情況。研究中將葉片進行動態分析獲得其廣域應變模態形狀,再將其轉化為「旋轉位移」模態形狀,即可應用局部柔度法進行損傷診斷。以往的研究曾建構一座簡化小型風機試體,來驗證上述損傷診斷方法概念之可行性,獲得不錯的診斷效果。因此,本研究擬進一步針對大型實際風機葉片,利用ANSYS WORKBENCH 有限元素數值分析軟體模擬美國再生能源實驗室(National Renewable Energy Laboratory,NREL)之5百萬瓦(5MW)離岸風機葉片結構,驗證上述方法之可行性。此外,並利用損傷指標法進行損傷診斷。本研究以切割方式模擬葉片損傷,並考慮「同區段不同方位及不同切割方向」及「不同區段同方位及同切割方向」之影響性。數值分析的結果顯示,本研究所提出之方法可正確診斷出葉片損傷位置。
論文英文摘要:Wind turbine blades are cost effective and can be damaged by wind gusts, fatigue, lighting strikes and moisture absorption. Therefore, damage detection of wind turbine blades is one of the important issues of condition monitoring of wind turbines. Many vibration-based structural damage detection techniques have been proposed in the last two decades. The local flexibility method, which can determine local stiffness variations of beam-like structures by using measured modal parameters, is one of the promising vibration-based approaches. Especially, a few structural modal parameters identified from the ambient vibration signals both before and after damage are required for the local flexibility method. In this study, we propose a damage detection approach for wind turbine blades using the local flexibility method based on the dynamic macro-strain signals measured by FBG-based sensors. In precious studies, the proposed approach was verify as a promising way to detect damage of the blades using a simplified and scaled wind turbine structure. In this study, the feasibility of proposed approach was further verified using a full-scale numerical ANSYS model of a 5MW wind turbine blade of the National Renewable Energy Laboratory to consider the complex shell structure of the real blade. Some local damages simulated by simply cutting of the blades at different locations and orientations were considered. Another damage index method based on the macro-strain measurement was also tested. The results illustrated the proposed approaches are capable to locate the simulated damages of the blades.
論文目次:中文摘要 i
英文摘要 ii
誌 謝 iv
目 錄 v
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1研究動機與目的 1
1.2文獻回顧 3
1.3 研究內容 6
第二章 理論 9
2.1 局部柔度法概念 9
2.2 局部柔度法 14
2.3 損傷指標診斷方法 17
2.4 柔度矩陣 18
第三章 數值模擬 21
3.1 模型描述 21
3.1.1 數值模型資料擷取點位 22
3.1.2 模型損傷描述 22
3.1.3 模型損傷診斷判別方式 24
3.2 局部柔度法 26
3.2.1 分析方法 26
3.2.2 葉片結構之分析結果與比較 27
3.2.3 小結 36
3.3 損傷指標方法 38
3.3.1 分析方法 38
3.3.2 葉片結構分析結果與比較 38
3.3.3 小結 39
第四章 結論 111
參考文獻 115
論文參考文獻:1. Jui-Sheng Chou,Chien-Kuo Chiu,I-Kui Huang and Kai-Ning Chi, "Failure analysis of wind turbine blade under critical wind loads", Engineering Failure Analysis, vol. 27, 2013, pp. 99-118.
2. Dr. Brahim Attaf, Recent Advances in Composite Materials for Wind Turbine Blades, Hong Kong: The World Academic Publishing Co. Ltd., 2013, pp.221-232.
3. Sabbah Ataya and Mohamed M.Z. Ahmed, "Damages of wind turbine blade trailing edge: Forms, location, and root causes", Engineering Failure Analysis, vol. 35, 2013, pp. 480-488.
4. Rytter A, Vibration based inspection of civil engineering structures, PhD,Alborg University, Denmark,1993
5. Toksoy, T. and Aktan, A. E., "Bridge-Condition Assessment By Modal Flexibility," Experimental Mechanics, Vol. 34, 1994,pp. 271–278.
6. Bernal D.,"Load Vectors for Damage Localization," Journal of Engineering Mechanics, "Vol. 128, No. 1, 2002,pp. 7-14.
7. Reynders E. and De Roeck G.,"A Local Flexibility Method for Vibration-based Damage Localization and Quantification.," Journal of Sound and Vibration, Volume 329, Issue 12,2010, pp. 2367-2383.
8. Abdo, M. A.-B. & Hori, M. ," A numerical study of structural damage detection using changes in the rotation of mode shapes, "Journal of Sound Vibration, 251(2), 227–39,2002.
9. Li, S. Z. & Wu, Z. S.," Development of distributed long gage fiber optic sensing system for structural health monitoring," Structural Health Monitoring, 6(6), 133–43,2007.
10. Jonkman, J., Butterfield, S., Musial, S. and Scott G., "Definition of a 5-MW Reference Wind Turbine for Offshore System Development", Technical Report NREL/TP-500-38060 ,National Renewable Energy Laboratory, Golden, CO, February 2009
11. Z. H. Zamora Guevara, Generation of design knowledge from the development of a theoretically idealized wind turbine, Ph.D. Thesis, Technische Universiteit Eindhoven , Eindhoven,2010
12. 李志剛,基於廣域應變之局部柔度法於風機結構損傷診斷之研究,碩士論文,國立臺北科技大學土木與工程學系,台北,2014。
13. 許丁友,土木基礎結構損壞偵測技術:含非線性環境影響之考慮,博士論文,國立臺灣大學工學院土木工程學系,台北,2010。
論文全文使用權限:同意授權於2016-08-10起公開