基于点云数据的量化不确定性有限元模型更新

IF 2.4 Q3 COMPUTER SCIENCE, ARTIFICIAL INTELLIGENCE
W. Graves, K. Nahshon, K. Aminfar, D. Lattanzi
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引用次数: 0

摘要

摘要虽然有限元建模被广泛用于结构系统的极限强度评估,但将复杂的变形和缺陷纳入有限元模型仍然是一个挑战。传统的方法通常依赖于通过谱或模态方法对畸变周期性的假设。然而,在这些假设无效的许多现实情况下,这些方法是不可行的。研究工作不断证明,通过激光扫描或基于摄影测量的方法生成的点云数据能够准确捕获毫米尺度的结构变形。这使得数值模型的更新能够捕捉精确的结构配置和初始缺陷,而不需要不切实际的假设。本文研究了用点云数据更新加劲船甲板板有限元模型的初始变形,以估计其极限强度。所提出的方法还有一个额外的好处,就是能够明确地说明分析中的测量不确定度。使用更新的有限元模型的计算与地面真值测试数据以及使用标准谱方法更新的有限元模型进行了比较。结果表明,强度估计与现有方法相当,具有不确定性量化和适用于更广泛的应用场景的额外优势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Finite element model updating with quantified uncertainties using point cloud data
Abstract While finite element (FE) modeling is widely used for ultimate strength assessments of structural systems, incorporating complex distortions and imperfections into FE models remains a challenge. Conventional methods typically rely on assumptions about the periodicity of distortions through spectral or modal methods. However, these approaches are not viable under the many realistic scenarios where these assumptions are invalid. Research efforts have consistently demonstrated the ability of point cloud data, generated through laser scanning or photogrammetry-based methods, to accurately capture structural deformations at the millimeter scale. This enables the updating of numerical models to capture the exact structural configuration and initial imperfections without the need for unrealistic assumptions. This research article investigates the use of point cloud data for updating the initial distortions in a FE model of a stiffened ship deck panel, for the purposes of ultimate strength estimation. The presented approach has the additional benefit of being able to explicitly account for measurement uncertainty in the analysis. Calculations using the updated FE models are compared against ground truth test data as well as FE models updated using standard spectral methods. The results demonstrate strength estimation that is comparable to existing approaches, with the additional advantages of uncertainty quantification and applicability to a wider range of application scenarios.
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来源期刊
DataCentric Engineering
DataCentric Engineering Engineering-General Engineering
CiteScore
5.60
自引率
0.00%
发文量
26
审稿时长
12 weeks
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