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題 名 | 應用3D聲學斷層影像技術評估臺灣肖楠圓盤人工模擬裂縫=Application of 3D Acoustic Tomography Technique for Evaluation of Artificial Crack on the Discs in Calocedrus Formosana |
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作 者 | 邱志明; 劉錦坤; 葉民權; | 書刊名 | 中華林學季刊 |
卷 期 | 47:2 2014.06[民103.06] |
頁 次 | 頁225-240 |
分類號 | 436.18 |
關鍵詞 | 裂縫; 3D聲學斷層影像; 超音波; 應力波; Cracks; 3D acoustic tomography; Ultrasonic; Stress wave; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究採用肖楠圓盤模擬樹木可能產生的裂縫型態,評估Fakopp ArborSonic 3D聲學斷層影像對裂縫檢測的可行性,並以超音波檢測法驗證。結果如下,人工模擬內裂及環裂圓盤的聲學斷層影像會顯示為中央空洞的型態,端裂則是無法顯示出正確圖形,建議輔助以目視評估法及鑽孔阻抗圖譜儀進行確認。由相對音速在傳遞路徑中的分布情形,可發現音波在模擬裂縫圓盤中傳遞會出現大量干擾現象。圓盤平均音速之標準差與裂縫率有密切關係,特別是模擬端裂和環裂的圓盤中,R^2值可達0.95以上,本研究之結果對內部缺點之理解,可提供都市立木安全評估之參據。 |
英文摘要 | The purpose of this study was to evaluate the cracks of tree disc using the 3D acoustic tomography an inspection the feasibility, simulation artificial crack on the Taiwan Incense Cedar (Calocedrus formosana) discs, moreover, the experiment applied ultrasonic detection confirmed the results. We found that internal crack and shake of the discs by acoustic tomography images indicated the pattern of the central hole, and end split revealed the incorrect location. To make better assessment of internal condition of defects, other approaches such as visual tree inspection and drilling resistography could also be employed to confirm. The distribution of relative velocity in the transmission paths, in this study, was found sound wave having large interference for propagation in the artificial crack disc. The relation between standard deviation of the velocity and cracks ratio of discs were with strong correlation. Especially, discs of the end split and shake of the R^2 value were 0.95 or more. Results from this study offered insights that might be used the references of safety factor for urban trees. |
本系統中英文摘要資訊取自各篇刊載內容。