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Structural Engineering and Mechanics
  Volume 74, Number 4, May25 2020, pages 521-532
DOI: http://dx.doi.org/10.12989/sem.2020.74.4.521
 


Ballasting plan optimization for operation of a 2D floating dry dock
Kyungho Yoon, Hyo-Jin Kim, Seungkyun Yeo, Younghwa Hong, Jihye Cha and Hyun Chung

 
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.
 
Key Words
    floating dock; offshore structure; finite element model; optimization; ballasting plan
 
Address
Kyungho Yoon, Hyo-Jin Kim, Seungkyun Yeo: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology,
291, Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Younghwa Hong, Jihye Cha: Institute of Industrial Technology, Samsung Heavy Industries,
217, Munji-ro, Yuseong-gu, Daejeon 34051, Republic of Korea
Hyun Chung: Department of Naval Architecture & Ocean Engineering,
Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
 

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