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標題: | 應用位移模型與虛擬觀測平差法於應變場參數解算 Strain Field Determination Based on Displacement Gradient Model and Unified Least-Squares Technique |
作者: | Yi-Chun Lin 林以淳 |
指導教授: | 韓仁毓(Jen-Yu Han) |
關鍵字: | 變形分析,應變場,離散點資料,結構物安全監測, Deformation analysis,Strain field,Dispersed point data,Structural health monitoring, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 變形分析係由測量而得的觀測資訊估計物體的變形量,甚至推測可能之破壞行為,無論在結構物監測、災害防治或地球物理領域均有相當廣泛之應用。實務上,變形分析主要架構於少數、高精度的觀測資訊,不足以描述物體整體的變形趨勢;另一方面,新興的測量技術如攝影測量之特徵點萃取與影像匹配或三維雷射掃描技術均可在短時間內獲取物體表面密集的觀測資料,應有助於呈現物體的變形趨勢。本研究之目標為改進現有變形分析方法,並建立應用巨量離散點資料的分析策略:首先,以位移模型配合虛擬觀測平差求解變形參數,推導對應之品質評估方法並進行靈敏度分析,增進變形分析成果的可靠性;其次,以網格式最鄰近點法或不規則三角網界定點位的鄰近關係、建構分析區塊,有效提升大量資料的處理效能。藉由模擬資料與實際資料實驗,不僅證實虛擬觀測平差能夠改善現有分析方法,更顯示本研究方法能直接應用於巨量觀測資料的分析,求得物體上完整的應變場、辨別顯著變形區域。 Deformation analysis is crucial to applications of structural engineering, geodesy and geology, of which the main goal is to detect behaviors of a deformed body. At present most deformation analysis relies on a limited number of high accuracy observations. However, it is insufficient when it comes to describing the strain field on the entire object. Modern techniques, including digital photogrammetry and the Light Detection and Ranging (LiDAR), provide the possibility to obtain a large number of observations in a very efficient manner. These large amount of data can be used to better estimate strain field with appropriate analyzing methods. In this study, a method based on displacement gradient model and unified least-squares is proposed to improve classical deformation analysis; in addition, the corresponding quality assessment and sensitivity analysis are derived accordingly. Furthermore, using a nearest neighboring searching and triangulated irregular network, a strategy for analyzing vast number of observations is established. Numerical experiments based on both simulated and real data suggested that the proposed approach processed large data to detected behaviors of a deformed body in an effective and efficient way. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/55941 |
全文授權: | 有償授權 |
顯示於系所單位: | 土木工程學系 |
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