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

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 Lee, C., "The strain-smoothed MITC3+ shell finite element" 223 : 2019

2 Lee, P. S., "The quadratic MITC plate and MITC shell elements in plate bending" 41 : 712-728, 2010

3 Ko, Y., "The MITC4+ Shell element and its performance" 169 : 57-68, 2016

4 Jun, H., "The MITC3+ shell element enriched in membrane displacements by interpolation covers" 337 : 458-480, 2018

5 Lee, Y. G., "The MITC3+ shell element and its performance" 138 : 12-23, 2014

6 Russian Maritime Register of Shipping, "Rules for Technical Supervision during Construction of Ships and Manufacture of Materials and Products for Ships"

7 China Classification Society, "Rules for Classification of Floating Docks"

8 Det Norske Veritas, "Rules for Classification of Floating Docks"

9 Germanischer Lloyd, "Rules for Classification and Construction Floating Docks"

10 American Bureau of Shipping, "Rules for Building and Classing Steel Floating Dry Docks"

11 Shan, X. L., "Risk management of mooring operation of floating dock" 4 : 398-409, 2009

12 Wang, G. G., "Review of metamodeling techniques in support of engineering design optimization" 129 : 370-380, 2006

13 Ko, Y., "Performance of the MITC3+ and MITC4+ shell elements in widely-used benchmark problems" 193 : 187-206, 2017

14 Kurniawan, A., "Optimization of ballast plan in launch jacker load-out" 38 : 267-288, 2009

15 Lee, P. S., "On the asymptotic behavior of shell structures and the evaluation in finite element solutions" 80 : 235-255, 2002

16 윤경호, "Nonlinear torsional analysis of 3D composite beams using the extended St. Venant solution" 국제구조공학회 62 (62): 33-42, 2017

17 Yoon, K., "Nonlinear performance of continuum mechanics based beam elements focusing on large twisting behaviors" 281 : 106-130, 2014

18 Yoon, K., "Modeling the warping displacement fields for discontinuously varying arbitrary cross-section beams" 131 : 56-69, 2014

19 Lee, P. S., "Insight into finite element shell discretizations by use of the ‘basic shell mathematical model’" 83 : 69-90, 2005

20 Lee, Y. G., "Improving the MITC3 shell finite element by using the Hellinger-Reissner principle" 110-111 : 93-106, 2012

21 Yoon, J. S., "Hydroelastic analysis of floating plates with multiple hinge connections in regular waves" 36 : 65-87, 2014

22 Yoon, K., "Geometrically nonlinear finite element analysis of functionally graded 3D beams considering warping effects" 132 : 1231-1247, 2015

23 Smith, D., "Floating dock deflection management systems, US Patent 8,155,812"

24 Bathe, K.J, "Finite Element Procedures" Prentice Hall 2014

25 Rao, S.S., "Engineering Optimization: Theory and Practice" Wiley 2009

26 Lee, P. S., "Development of MITC isotropic triangular shell finite elements" 82 : 945-962, 2004

27 Korotaev, V. V., "Deflection measuring system for floating dry docks" 117 : 39-44, 2016

28 Yang, G., "Deflection and inclination measuring system for floating dock based on wireless networks" 69 : 1-8, 2013

29 Kim, H. J., "Continuum mechanics based beam elements for linear and nonlinear analyses of multi-layered composite beams with interlayer slips" 235 : 111740-, 2020

30 Yoon, K., "An efficient warping model for elastoplastic torsional analysis of composite beams" 178 : 37-49, 2017

31 Park, K. C., "A simple algorithm for localized construction of non-matching structural interfaces" 53 : 2117-2142, 2002

32 윤경호, "A continuum mechanics based 3-D beam finite element with warping displacements and its modeling capabilities" 국제구조공학회 43 (43): 411-437, 2012