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Detection of periodic displacements of shell structures with edges using spline surfaces, meshes and point clouds Cover

Detection of periodic displacements of shell structures with edges using spline surfaces, meshes and point clouds

Reports on Geodesy and Geoinformatics
Volume 112 (2021): Issue 1 (December 2021)
By: Grzegorz Lenda and  Katarzyna Abrachamowicz  
Open Access
|Dec 2021

Figures & Tables

Figure 1

The shell studied during the measurements performed in 2013 (a) and 2020 (b)
The shell studied during the measurements performed in 2013 (a) and 2020 (b)

Figure 2

The flange torn off and bent in 2013 (a) and repaired in 2020 (b). The tile damaged in 2020 (d) compared to 2013 (c). The photos show the edges of the flange and narrow longitudinal slats forming additional edges
The flange torn off and bent in 2013 (a) and repaired in 2020 (b). The tile damaged in 2020 (d) compared to 2013 (c). The photos show the edges of the flange and narrow longitudinal slats forming additional edges

Figure 3

Point clouds from the epoch 2013 (a) and 2020 (b)
Point clouds from the epoch 2013 (a) and 2020 (b)

Figure 4

Chamfering of the mesh edge (a), undulations of the spline surface along the edge (b)
Chamfering of the mesh edge (a), undulations of the spline surface along the edge (b)

Figure 5

Periodic displacements of the structure determined by direct comparison of point clouds. View of the entire structure as well as the left and right parts of the front patches with deformations and edges
Periodic displacements of the structure determined by direct comparison of point clouds. View of the entire structure as well as the left and right parts of the front patches with deformations and edges

Figure 6

Periodic displacements of the structure determined by comparing the primary point cloud with the mesh model created for the current measurement. View of the entire structure as well as the left and right parts of the front patches with deformations and edges
Periodic displacements of the structure determined by comparing the primary point cloud with the mesh model created for the current measurement. View of the entire structure as well as the left and right parts of the front patches with deformations and edges

Figure 7

Periodic displacements of the structure determined by comparing the primary point cloud with the spline model created for the current measurement. View of the entire structure as well as the left and right parts of the front patches with deformations and edges
Periodic displacements of the structure determined by comparing the primary point cloud with the spline model created for the current measurement. View of the entire structure as well as the left and right parts of the front patches with deformations and edges

Percentages of the individual deviation ranges and the average deviations

Range of deviations [mm]Percentage of deviation [%]
Cloud to cloudCloud to meshCloud to spline
(0, 5]98.8395.1637.75
(5, 10]0.903.2533.06
(10, 15]0.111.1322.35
(15, 20]0.060.375.68
>200.110.091.16
Average deviation [mm]1.92.87.1
DOI: https://doi.org/10.2478/rgg-2021-0005 | Journal eISSN: 2391-8152 | Journal ISSN: 0867-3179
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Language: English
Page range: 27 - 33
Submitted on: Jul 3, 2021
Accepted on: Nov 18, 2021
Published on: Dec 17, 2021
Published by: Warsaw University of Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year
Keywords:
periodic measurements,
deformations,
point clouds,
mesh,
spline
Related subjects:
Computer sciences,
Computer sciences, other,
Geosciences,
Geodesy,
Cartography and photogrammetry,
Geosciences, other

© 2021 Grzegorz Lenda, Katarzyna Abrachamowicz, published by Warsaw University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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