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論文中文名稱:基於廣域應變之局部柔度法於風機結構損傷診斷之研究 [以論文名稱查詢館藏系統]
論文英文名稱:Damage detection of Wind Turbines Structures using Local Flexibility Method based on 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:土木與防災研究所
畢業學年度:102
出版年度:103
中文姓名:李志剛
英文姓名:Chih-kang Lee
研究生學號:101428019
學位類別:碩士
語文別:中文
口試日期:2014-07-29
論文頁數:159
指導教授中文名:廖文義
指導教授英文名:Wen-I Liao
口試委員中文名:柴駿甫;邱建國
口試委員英文名:Juin-Fu Chai;Chien-Kuo Chiu
中文關鍵詞:局部柔度法旋轉位移模態廣域應變風機結構損傷診斷
英文關鍵詞:local flexibility methodrotatory displacement mode shapesmacro strainWind turbinedamage detection
論文中文摘要:由於風力發電機組容易被狂風、雷擊所損傷,而建造一座風力發電機組動則上千萬。因此,風機葉片的損傷偵測是監測風機狀況的其中項重要課題之一。許多建築用的損傷偵測技術已陸續在近二十年間被提出,其中一種方法為局部柔度法,該方法是一種根據局部剛度改變量來判斷結構物之損傷位置和程度的一種方法,為近年來其中一項大有可為的技術。局部柔度法不需要一個有限元素的結構模型就可從環境振動信號中識別出損傷情形。在本研究中,我們提出一個針對基於由廣域光纖光柵感測器所測量的廣域應變信號,進而使局部柔度法應用於轉動的風機葉片的損傷偵測。本研究設計了一個大型的風力發電機組,此風機結構設計時參考一個典型實際規模1.5MW風機之自然頻率。並將此結構架設於國家地震工程研究中心之振動台上進行試驗。轉動葉片的光纖訊號經由一個空心軸承內的轉子機制讓訊號可以即時傳輸,轉動的接頭被發送到一個由固定之數據擷取系統收錄。本研究利用加勁鋁板黏著於風機葉片的方式模擬了可逆的損害,目的是為了試體之重複使用性。由國家地震工程研究中心之振動台試驗結果顯示,本研究所提出之方法可正確診斷葉片之損傷位置。
論文英文摘要:Wind turbine are cost effective and can be damaged by wind gusts, fatigue, lighting strikes and moisture absorption. Therefore, damage detection of wind turbine 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 to determine the amount of damage location and extent of the structure, is one of the promising vibration-based approaches. The local flexibility method does not require a finite element model of the structure. In this study, we propose a damage detection approach for rotating wind turbine blade and tower using the local flexibility method based on the dynamic macro-strain signals measured by FBG-based sensors. A scaled wind turbine structure was constructed and then excited on a shaking table to generate vibration signals. The structure was designed to have similar natural frequencies of a typical 1.5MW wind turbine in real scale.The optical fiber signal of the rotating blades was transmitted to the fixed data acquisition system through a rotary joint fixed inside the hollow shaft in the nacelle. Reversible damage was simulated by aluminum plates attached to some sections of wind turbine blades. The damage location of the rotating blades were successfully detected using the proposed approach with the damage extent somewhat over-estimated.
論文目次:目 錄

中文摘要 i
英文摘要 iii
誌謝 v
目錄 vii
表目錄 ix
圖目錄 x
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 10
2.2 應用模態廣域應變之局部柔度法 14
2.3 隨機子空間識別法之簡介 16
2.4 柔度矩陣 19
第三章 數值模擬 23
3.1 模型描述 23
3.2 分析方法 26
3.3 葉片分析結果與比較 27
3.3.1 小結 30
3.4 塔柱分析結果與比較 30
3.4.1 小結 33
第四章 風機結構試驗 73
4.1 試驗儀器介紹 73
4.2 試體描述 74
4.3 試驗方法 75
4.4 試驗結果與比較 77
4.4.1 葉片之四種加勁情況 77
4.4.2 塔柱之四種加勁情況 81
4.4.3 加速規之識別狀況與診斷結果 83
4.4.4 誤差現象之數值驗證 84
4.4.5 小結 85
第五章 結論 153
5.1 風機結構(葉片) 153
5.2 風機結構(塔柱) 155
5.3 未來研究方向 157
參考文獻 159
論文參考文獻:1. Rytter A,Vibration based inspection of civil engineering structures, PhD,Alborg University, Denmark,1993
2. Toksoy, T. and Aktan, A. E., "Bridge-Condition Assessment By Modal Flexibility," Experimental Mechanics, Vol. 34, 1994,pp. 271–278.
3. Bernal D.,"Load Vectors for Damage Localization," Journal of Engineering Mechanics, "Vol. 128, No. 1, 2002,pp. 7-14.
4. 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.
5. 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.
6. 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.
7. 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2015-12-10起公開