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論文中文名稱:廣域應變應用於薄板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 Thin Plate Structures 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:土木與防災研究所
畢業學年度:102
出版年度:103
中文姓名:施易成
英文姓名:Yi-Cheng Shih
研究生學號:101428002
學位類別:碩士
語文別:中文
口試日期:2014-07-29
論文頁數:100
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:邱建國;柴駿甫
口試委員英文名:Juin-Fu Chai
中文關鍵詞:擬局部柔度法廣域應變模態曲率診斷方法模態曲率平方診斷方法基於模態應變能的損傷指數法薄板結構損傷診斷
英文關鍵詞:Pseudo Local Flexibility MethodMacro StrainModal Curvature MethodModal Curvature Squared MethodDamage Index Based on Modal Strain EnergyThin Plate StructureDamage detection
論文中文摘要:基於結構動態特性進行結構健康診斷的研究在近年來相當的受重視,此類研究過去大多採用側向振動訊號之量測,而本研究更進一步改由軸向量測廣域應變之振動訊號,利用此訊號進行系統識別得到廣域應變的模態形狀並將其轉換為旋轉自由度的模態形狀。本研究將廣域應變及側向加速度兩種量測方法應用於薄板結構上,並使用模態曲率診斷方法、模態曲率平方診斷方法、基於模態應變能的損傷指數方法、應用光纖量測廣域應變模態之擬局部柔度法、應用加速度計量測側向位移模態之擬局部柔度法等的健康診斷的方法,進行數值模擬與實際試驗之驗證。其結果顯示,基於模態曲率的診斷方法中,僅基於模態應變能的損傷指數方法對於薄板結構損傷定位能有準確的結果,但該方法僅能對於損傷位置進行診斷,故本研究嘗試發表「應用加速度計量測側向位移模態」與「應用光纖量測廣域應變模態」之擬局部柔度法,期盼能進一步診斷損傷程度,但其數值模擬與實驗顯示,只有後者能夠應用於薄板結構的損傷診斷,且仍有許多誤差可能影響診斷結果。
論文英文摘要:Vibration-based techniques become popular for structural health monitoring in last decades. In this study, several damage detection algorithms based on modal curvature were used to detect damage of a thin plate structure. Besides the existing Modal Curvature method (MC), Modal Curvature Squared method (MCS), and Damage Index based on modal strain energy (DI), the Pseudo Local Flexibility Method (PLFM) using either traditional lateral acceleration measurement or a novel macro-strain measurement was also developed to perform damage quantification of a thin plate structure. The rotary mode shapes was obtained using the macro-strain measured by long-gauge FBG sensors while the lateral mode shapes was obtained using the lateral acceleration measured by accelerometers. Both numerical and experimental studies were conducted in this study to understand the feasibility of the above methods to detect damage location and extent of a thin steel plate fixed at two edges. The results show that among all the above-mentioned methods, the DI method is the most capable one to perform damage localization. However, the results of the damage detection of the thin plate using the PLFM were not satisfactory. Nevertheless, the PLFM based on rotary mode shapes performed much better than the one based on lateral mode shapes for damage detection of the thin plate.
論文目次:中文摘要 i
英文摘要 ii
致謝 iv
目 錄 v
表目錄 viii
圖目錄 ix
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 8
2.1基於模態曲率的診斷方法 9
2.2擬局部柔度法 12
2.3隨機子空間識別法之簡介 19
2.4柔度矩陣 24
第三章 數值模擬 26
3.1模型描述 26
3.1.1數值模型資料擷取點位 27
3.1.2模型損傷或加勁描述 27
3.2基於模態曲率的診斷方法 28
3.2.1分析方法 28
3.2.2版結構分析結果與比較 29
3.2.3小結 30
3.3擬局部柔度法 31
3.3.1應用光纖量測模態廣域應變之分析方法 31
3.3.2版結構分析結果與比較 32
3.3.3小結 34
3.3.4應用加速度計量測側向位移模態分析方法 35
3.3.5版結構分析結果與比較 35
3.3.6小結 36
第四章 薄板結構試驗 68
4.1 試驗儀器介紹 68
4.2 試體描述 69
4.2.1 加勁描述 69
4.3 基於模態曲率的診斷方法 70
4.3.1 試驗結果 70
4.3.2 小結 72
4.4擬局部柔度法 72
4.4.1應用光纖光柵廣域應變計量測模態廣域應變 72
4.4.2試驗結果 72
4.4.3 小結 74
4.4.4 應用加速度計量測側向位移模態 74
4.4.5 試驗結果 74
4.4.6 小結 75
第五章 結論 95
5.1 基於模態曲率的診斷方法 95
5.2 應用廣域應變模態之擬局部柔度法 96
5.3 應用側向位移模態之擬局部柔度法 97
5.4 未來研究方向 98
參考文獻 99
論文參考文獻:1. Zhang JiPing, New Method For Damage Detection Of Plate And Shell Subjected To Multi-Location Ddamages, Journal of Mechanical Strength, School Of Navel Architecture and Civil Engineering, Zhoushan,2007
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3. Toksoy, T. and Aktan, A. E., "Bridge-Condition Assessment By Modal Flexibility," Experimental Mechanics, Vol. 34, 1994,pp. 271–278.
4. Bernal D.,"Load Vectors for Damage Localization," Journal of Engineering Mechanics, "Vol. 128, No. 1, 2002,pp. 7-14.
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