PSI - Issue 17

Behzad V. Farahani et al. / Procedia Structural Integrity 17 (2019) 712–717 Behzad V. Farahani et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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4. Conclusions

This study aims at acquiring the geometry of the interior surface of a wind tower. The objectives are to obtain the geometrical changes due to the welding process over wind tower fabrication. To fulfil the research goals, a 3D laser scanning system was deployed to scan the tower’s interior surface. As a result, the tower profile was successfully acquired as a point cloud. The obtained results allow us to infer that the supporting methodology has the potential to obtain the tower shape and make it possible to characterize the geometrical changes. The tower may deform in some places due to welding conditions and also because of the tower’s own weight which may result in residual stress occurrence along the welded spot. The 3D LSS is therefore advantageous, since it is capable of acquiring the tower shape and measuring the geometric changes. Therefore, the deployed system may assist in fabrication industries to correct the geometrical imperfection caused by the deformation. Behzad V. Farahani truly acknowledges the funding provided by Ministério da Educação e Ciência, Fundação para a Ciência e a Tecnologia (Portugal), under grant PD/BD/114095/2015. Pedro J. Sousa gratefully acknowledges the “Fundação para a Ciência e a Tecnologia” (FCT) for the funding of the PhD scholarship SFRH/BD/129398/2017. Authors gratefully acknowledge the funding of Project NORTE-01-0145-FEDER-000022 - SciTech - Science and Technology for Competitive and Sustainable Industries, cofinanced by Programa Operacional Regional do Norte (NORTE2020), through Fundo Europeu de Desenvolvimento Regional (FEDER). Pedro Moreira and Paulo Tavares further acknowledge FEDER through Programa Operacional Competitividade e Internacionalização – Compete2020 and Fundos Nacionais through FCT – Fundação para a Ciência e a Tecnologia through project PTDC/EME-EME/29339/2017 - Monitorização Multiescala de Fendas. Dilek, Ahmet U., Ali D. Oguz, Furkan Satis, Yigit D. Gokdel, and Muammer Ozbek. 2019. “Condition Monitoring of Wind Turbine B lades and Tower via an Automated Laser Scanning System.” Engineering Structures 189 (June): 25 – 34. https://doi.org/10.1016/j.engstruct.2019.03.065. Farahani, Behzad V., Francisco Barros, Pedro J. Sousa, Pedro P. Cacciari, Paulo J. Tavares, Marcos M. Futai, and Pedro Moreira. 2019. “A Coupled 3D Laser Scanning and Digital Image Correlation System for Geometry Acquisition and Deformation Monitoring of a Railway Tunnel.” Tunnelling and Underground Space Technology 91: 102995. https://doi.org/10.1016/J.TUST.2019.102995. Frondel, Manuel, Nolan Ritter, Christoph M. Schmidt, and Colin Vance. 2010. “Economic Impacts from the Promotion of Renewable Energy Technologies: The German Experience.” Energy Policy 38 (8): 4048 – 56. https://doi.org/10.1016/J.ENPOL.2010.03.029. Kim, Min-Koo, Jack C P Cheng, Hoon Sohn, and Chih- Chen Chang. 2015. “A Framework for Dimensional and Surface Quality Assessment of Precast Concrete Elements Using BIM and 3D Laser Scanning.” Automation in Construction 49 (Part B): 225 – 38. https://doi.org/10.1016/j.autcon.2014.07.010. Oliveira, Gustavo, Filipe Magalhães, Álvaro Cunha, and Elsa Caetano. 2018. “Continuous Dynamic Monitoring of an Onshore Wind Turbine.” Engineering Structures 164 (June): 22 – 39. https://doi.org/10.1016/J.ENGSTRUCT.2018.02.030. Pejić, Mar ko. 2013. “Design and Optimisation of Laser Scanning for Tunnels Geometry Inspection.” Tunnelling and Underground Space Technology 37: 199 – 206. https://doi.org/10.1016/j.tust.2013.04.004. Stentoumis, Christos, Konstantinos Loupos, Anastasios Doulamis, and Angelos Amditis. 2015. “A Computer Vision System for Tunnel Inspection.” In SEE Tunnel:Promoting Tunneling in SEE Region . Yoon, Jong-Suk, Myung Sagong, J.S. Lee, and Kyu- sung Lee. 2009. “Feature Extraction of a Concrete Tunnel Liner from 3D Laser Scanning Data.” NDT & E International 42 (2): 97 – 105. https://doi.org/10.1016/j.ndteint.2008.10.001. Zhang, Zhengyou. 2005. “Camera Calibration.” In Emerging Topics in Computer Vision , edited by G´erard Medioni and Sing Bing Kang, 653. Acknowledgements References