Research Papers: Offshore Technology

On Modeling and Simulation of Innovative Ship Rescue System

[+] Author and Article Information
Ilias Zilakos

School of Naval Architecture
and Marine Engineering,
National Technical University of Athens (NTUA),
9 Heroon Polytechniou Street,
Athens 157-73, Greece
e-mail: izilakos@central.ntua.gr

Michael Toulios

School of Naval Architecture
and Marine Engineering,
National Technical University of Athens (NTUA),
9 Heroon Polytechniou Street,
Athens 157-73, Greece
e-mail: mtoulios@deslab.ntua.gr

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received January 16, 2018; final manuscript received May 10, 2018; published online July 12, 2018. Assoc. Editor: Nianzhong Chen.

J. Offshore Mech. Arct. Eng 140(6), 061303 (Jul 12, 2018) (9 pages) Paper No: OMAE-18-1006; doi: 10.1115/1.4040303 History: Received January 16, 2018; Revised May 10, 2018

Inflatable devices that provide reserve buoyancy to damaged ships, preventing capsizing and/or sinking, along with lifting wreckages from the seabed, were studied within the framework of the European funded project “SuSy” (Surfacing System for Ship Recovery). Part of the work involved material evaluation and testing as well as simulations of the structural response. This paper first describes an orthotropic hyperelastic constitutive model for a candidate material also used in the fabrication of prototype inflatable devices. A strain energy density function is proposed that is further used to derive the stress and elasticity tensors required for the numerical implementation of the model in the user-defined subroutine (UMAT) of abaqus/standard. The second part of the paper presents the finite element simulation of the latter stages of inflation of two salvage devices inside an actual double bottom structure. The numerical results are in good agreement with tests conducted in dry land and under water, with the structure raised following the inflation of the devices. The evolving stress state in both the devices and the double bottom structure under increased contact interaction leads to useful conclusions for future use in the development of this salvage system.

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Fig. 1

Actual double bottom structure (left) and a sketch of the half structure with deployed SuSy inflatables (right), where S and P denote starboard and port side, respectively

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Fig. 2

The location and orientation of the four strain gauge rosettes (A1, A2, B1, B2) installed on the two T-profile stiffeners of the inner bottom (see Fig. 1, right)

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Fig. 3

Contact areas between the devices and several structural components of the double bottom compartment

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Fig. 4

Uniformly scaled up deformed shapes of the middle sections of the left and right inflatables at the end of the first analysis step

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Fig. 5

Uniformly scaled up deformed shapes of the middle section of the left and right inflatables at the end of the second simulation step

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Fig. 6

The salvage process: (a) the structure was submerged into water, (b) the structure began to emerge after the activation of the system (no strain on the lifting wires), and (c) the structure remained afloat at its maximum freeboard (approximately 30 cm) at the end of the salvage process

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Fig. 7

Equivalent stress histories computed for the strain gauges installed on the T-profile stiffeners of the top plate (see Fig. 3, sensor B1 malfunctioned)

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Fig. 8

Contour plot of the equivalent stress on half of testbed structure (top). The insets (bottom) depict the top plate stiffeners, where their deformed shape is uniformly scaled up, along with the positions of the active strain gauges installed on the actual testbed structure.

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Fig. 9

Stress ratio along the upper (top) and lower (bottom) segment of the inflatable's longitudinal middle section

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Fig. 10

Stresses along the two material directions for the upper (top) and lower (bottom) section segment of the inflatable

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Fig. 11

Shear forces acting on one inflatable at the end of the first (top) and second (bottom) analysis step



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