Structural Engineering and Mechanics

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Ballasting plan optimization for operation of a 2D floating dry dock

  • Yoon, Kyungho (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Hyo-Jin (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Yeo, Seungkyun (Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Hong, Younghwa (Institute of Industrial Technology, Samsung Heavy Industries) ;
  • Cha, Jihye (Institute of Industrial Technology, Samsung Heavy Industries) ;
  • Chung, Hyun (Department of Naval Architecture & Ocean Engineering, Chungnam National University)
  • Received : 2019.12.18
  • Accepted : 2019.12.26
  • Published : 2020.05.25
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Abstract

A floating dry dock is an advanced structure that can provide a solution for dry dock space shortages. The critical point in floating dock operation is compensating the deflection caused by a heavy payload by adjusting the water level in the ballast system. An appropriate ballasting plan warrants safe and precise construction on a floating dock. Particularly, in the case of a 2D floating dock, ballasting plan evaluation is crucial due to complex deformation modes. In this paper, we developed a method to calculate the optimal ballasting plan for accurate and precise construction on a 2D floating dock. The finite element method was used for considering the flexibility of the floating dock as well as the construction blocks. Through a gradient-based optimization algorithm, the optimal ballasting plan for the given load condition was calculated in semi-real time (5 min). The present method was successfully used for the actual construction of an offshore structure on the 2D floating dock.

Keywords

Acknowledgement

We thank Professor Phill-Seung Lee at Korea Advanced Institute of Science and Technology (KAIST) for the valuable discussion and comments. This work was performed by the Samsung Heavy Industry (SHI)-KAIST research collaboration program. This work was also supported by the "Human Resources Program in Energy Technology" of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and granted financial resources from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20184030202000). This research was a part of the project titled 'Development of rapid response technology for oil spill prevention', funded by the Ministry of Oceans and Fisheries, Korea (No.2019044019).

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