利用样条曲面、网格和点云检测带边缘壳结构的周期性位移

IF 0.3 Q4 REMOTE SENSING Reports on Geodesy and Geoinformatics Pub Date : 2021-12-01 DOI:10.2478/rgg-2021-0005
G. Lenda, Katarzyna Abrachamowicz
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引用次数: 0

摘要

摘要:本文研究了利用激光扫描周期性测量复杂形状壳体结构位移的问题。不同测量时段得到的点云可以直接相互比较,也可以以三角形网格或光滑斑块(样条函数)的形式转换为连续模型。点云直接比较的精度取决于扫描密度,而点云与模型比较的精度取决于模型创建过程中形成的近似误差。与样条模型相比,使用三角形网格建模使对象的局部结构平坦化。然而,如果壳在其结构中有边缘,由于沿它们的函数的波动,用样条模型精确地表示它们是不可能的。边缘也可以通过与横向三角形的倒角而被网格模型扭曲。这些类型的表面建模误差可能导致结构产生伪变形,难以与真实变形区分。为了评估使用上述方法正确确定变形的可能性,对一个复杂壳结构进行了两个时期的激光扫描。然后,对周期测量结果进行了建模和比较。通过研究,确定了每种方法的优缺点。值得注意的是,没有一种方法能够在抑制伪变形的同时正确地表示所有变形。然而,它们的最佳特性的结合使得确定结构的实际变形成为可能。
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Detection of periodic displacements of shell structures with edges using spline surfaces, meshes and point clouds
Abstract This research paper tackles the problem of determining displacements of complex-shaped shell structures, measured periodically using laser scanning. Point clouds obtained during different measurement epochs can be compared with each other directly or they can be converted into continuous models in the form of a triangle mesh or smooth patches (spline functions). The accuracy of the direct comparison of point clouds depends on the scanning density, while the accuracy of comparing the point cloud to the model depends on approximation errors that are formed during its creation. Modelling using triangle meshes flattens the local structure of the object compared to the spline model. However, if the shell has edges in its structure, their exact representation by spline models is impossible due to the undulations of functions along them. Edges can also be distorted by the mesh model by their chamfering with transverse triangles. These types of surface modelling errors can lead to the generation of pseudo-deformation of the structure, which is difficult to distinguish from real deformation. In order to assess the possibility of correct determination of deformation using the above-mentioned methods, laser scanning of a complex shell structure in two epochs was performed. Then, modelling and comparison of the results of periodic measurements were carried out. As a result of the research, advantages and disadvantages of each method were identified. It was noticed that none of the methods made it possible to correctly represent all deformations while suppressing pseudo-deformation. However, the combination of their best qualities made it possible to determine the actual deformation of the structure.
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自引率
28.60%
发文量
5
审稿时长
12 weeks
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