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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28104完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 劉佩玲 | |
| dc.contributor.author | Chia-Ching Lin | en |
| dc.contributor.author | 林佳慶 | zh_TW |
| dc.date.accessioned | 2021-06-13T00:01:06Z | - |
| dc.date.available | 2009-08-01 | |
| dc.date.copyright | 2007-08-01 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2007-07-31 | |
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W., and Bedrosian, E., “Hilbert Transforms and the Complex Representation of Real Signals”, Proceedings of the IEEE, Volume 54, Issue 3, Pages 434-435, 1966. 56. http://perso.ens-lyon.fr/patrick.flandrin 57. 杜平安, 有限元原理、建模及應用, 北京,國防工業出版社, 2004. 58. 黃自然, “佈置多層鋼筋網之厚混凝土版之缺陷偵測”, 碩士論文, 國立台灣大學應用力學研究所, 2003. 59. 蔡承霖, “應力波法在挫曲束制消能支撐非破壞檢測之應用”, 碩士論文, 國立台灣大學應用力學研究所, 2006. 60. 趙海鷗, LS-DYNA動力分析指南, 北京, 兵器工業出版社, 2003. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28104 | - |
| dc.description.abstract | 本研究之主旨為探討希爾伯–黃轉換(Hilbert–Huang Transform) 與其它訊號處理方法之差異，並將之應用於敲擊回音試驗，評估其可行性，最後提出定位裂縫的新訊號處理程序，使頻譜更清晰、峰值更明顯，且裂縫尖峰易判讀。
希爾伯–黃轉換為一非線性且非穩態之時間–頻率域訊號處理方法。在此轉換中，訊號首先以經驗模態分解法做自適性的分解，自動地產生構成此訊號的分量，稱為本質模態函數(Intrinsic Mode Function)，再利用希爾伯轉換求得每個本質模態函數的即時頻率與即時振幅，最後在時間–頻率軸所構成之二維圖譜上繪製即時振幅之等高線圖，即為希爾伯頻譜。透過希爾伯頻譜，便可更進一步解析隱含於訊號中的物理意義。 本研究嘗試以希爾伯–黃轉換分析敲擊回音訊號，發現其希爾伯頻譜上為一條上下振盪的明亮軌跡，難以辨識主頻，也無法據以偵測混凝土試體內部缺陷位置。然而配合短時傅利葉轉換或小波轉換，可觀察到各本質模態函數的時間–頻率分布特徵，即可判斷出各本質模態函數所對應之物理意義。其中雜訊能量最小，其時頻圖沿時間軸或頻率軸都無明顯變化；表面波能量消散最快；內部缺陷回音訊號能量消散次之，在缺陷深度所對應之頻率會出現明顯的峰值；模態振動能量最大，但消散最慢，在對應之自然頻率也會出現峰值。一旦定出代表內部缺陷回音訊號之本質模態函數，便可對此函數進行傅利葉轉換，並找出內部缺陷之頻率尖峰。經過數值模擬與模型試驗，可發現本文所提出之訊號處理程序所得到之頻譜與原始訊號相比，干擾更少、峰值更明顯，且不受模態振動之影響。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-13T00:01:06Z (GMT). No. of bitstreams: 1 ntu-96-R94543059-1.pdf: 3453866 bytes, checksum: cec963675c1a294382d54bffc17461fe (MD5) Previous issue date: 2007 | en |
| dc.description.tableofcontents | 第一章 前言 1
1-1 研究動機 1 1-2文獻回顧 2 1-3 研究內容 3 第二章 敲擊回音法 6 2-1 應力波傳行為 6 2-2 敲擊回音法 8 2-3 敲擊回音試驗參數 11 2-3-1 敲擊源 11 2-3-2 總取樣時間 14 2-3-3 取樣時距 15 2-4 敲擊回音法算例 16 第三章 訊號處理方法 23 3-1 傅利葉轉換 23 3-2 短時傅利葉轉換 25 3-3 小波轉換 26 3-4 希爾伯–黃轉換 30 3-4-1 希爾伯轉換 30 3-4-1.1 基本定義 31 3-4-1.2 相位平移系統 32 3-4-1.3 希爾伯轉換的性質 34 3-4-1.4 解析訊號 37 3-4-1.5 即時頻率 42 3-4-2 經驗模態分解法 49 3-4-2.1 本質模態函數 49 3-4-2.2 經驗模態分解法 51 3-4-2.3 相關性檢測與跨零點檢測 58 3-4-3 希爾伯頻譜與邊際頻譜 61 3-5 數值算例 64 3-5-1 諧波訊號 64 3-5-2 暫態訊號與內在調頻訊號 67 3-5-3 高斯雜訊 74 3-6 敲擊回音訊號分析方法 76 第四章 數值模型 105 4-1 有限元素分析軟體簡介 106 4-2 有限元素分析步驟 107 4-2-1 幾何模型建立 107 4-2-2 網格劃分 108 4-2-3 元素定義 109 4-2-4 負載與束制 111 4-2-5 求解 112 4-2-6結果分析 113 4-3 數值模型訊號分析 113 4-3-1 數值模型一 113 4-3-2 數值模型二 120 4-4 小結 123 第五章 模型試驗 141 5-1 模型試體 141 5-2 實驗設備 142 5-3 測點佈置 143 5-4 實驗參數 144 5-5 模型試驗訊號分析 145 5-5-1 模型試驗一 146 5-5-2 模型試驗二 156 5-6 小結 160 第六章 結論與展望 187 參考文獻 190 | |
| dc.language.iso | zh-TW | |
| dc.title | 經驗模態分解法於敲擊回音法之應用 | zh_TW |
| dc.title | Application of the Empirical Mode Decomposition in the Impact-Echo Method | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 95-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 郭茂坤,李有豐 | |
| dc.subject.keyword | 敲擊回音,經驗模態分解法,本質模態函數,希爾伯轉換,非破壞檢測, | zh_TW |
| dc.subject.keyword | Impact-Echo,Empirical Mode Decomposition,Intrinsic Mode Function,Hilbert Transform,Non-destructive Test, | en |
| dc.relation.page | 194 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2007-07-31 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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