Underwater Target Tracking of Offshore Crane System in Subsea Operations

Kang, Hooi-Siang; Wu, Yun; Quen, Lee Kee; Tang, Collin Howe Hing; Siow, C. L.

doi:10.1007/978-981-10-6502-6_11

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…Similar to recovering a sunken ship, existing research focuses on sea-based lifting operations [11][12][13][14], which offer valuable points of reference. Using computational fluid dynamics (CFD) theory and conducting experiments, Nam et al [15] investigated the coupled motion responses of a floating crane vessel and lifted subsea manifold during deepwater installation operations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Safety Assessment of Ships and Cables during Salvage Operations

Zou,

Chen,

Sun

et al. 2023

Applied Sciences

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The International Maritime Organization (IMO) emphasizes that shipwreck accidents frequently occur at sea and advocates for the safe recovery of shipwrecks. This paper examines the case of the Korean “Sewol” ferry salvage, where two lifting barges were symmetrically utilized to retrieve a substantial shipwreck. The dynamic analysis of the salvage operation is based on the computational fluid dynamics (CFD) approach. The main investigation covers two fundamental physical parameters: the motion response of the lifting barges and shipwreck and the tension response of the lifting cables. Using the parameters of the maximum absolute value (MA), root mean square (RMS), and coefficient of variation (CV), a unified criterion is established to quantitatively evaluate the safety of the salvage operation under different working conditions. The study demonstrates that by carefully considering the enhancement of safety and stability for the three vessels involved in the salvage process and by optimizing the safety performance of the lifting cables, suitable operating windows are determined at wave intervals of (115°, 155°) and (205°, 245°). Under most working conditions, curves illustrating the maximum tensions of lifting cables No. 1–15 and No. 16–30 show a distribution with a “middle part drooping” shape. The placement of connecting cables on the water’s surface at 1.1–1.2 times the salvage spacing between the two lifting barges or the arrangement of inclined lifting cables underwater proves advantageous in constraining the motion response of the three vessels. Reinforcing the lifting cables at the bow and stern ends is recommended. This study presents a methodology for salvaging a shipwreck using two lifting barges, which can be used as a reference for designing related salvage approaches.

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Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Safety Assessment of Ships and Cables during Salvage Operations

Zou,

Chen,

Sun

et al. 2023

Applied Sciences

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“…For ships, drag can be divided into two main types, which is the form drag and the viscous drag. Hydrodynamic effects of the floating structure affect the dynamic performance of the structure [9][10]. As drag resistance or frictional resistance contributes to a high proportion of the total resistance of a ship, especially for slow trading vessels, there is a need to study the drag resistance of the antifouling self-adhesive film.…”

Section: Introductionmentioning

confidence: 99%

Investigate the Drag Resistance of Antifouling Self-Adhesive Film

Khor

Siow

Malik

et al. 2020

ARFMTS

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Fouling has always been a common issue for ships as fouling drastically increases the surface roughness and ship resistance. The microfiber self-adhesive antifouling film is claimed to be effective up to 5 years and is environmentally friendly. However, there is lack of information about the drag characteristics of the antifouling material. Thus, this project is conducted based on an experimental study to determine the drag characteristics of the surface installed with microfiber self-adhesive antifouling film. The rotor apparatus is used to study the coefficient of friction of the microfiber surface. From the experimental results, a flat plate simulation using ANSYS-Fluent is conducted to further estimate the coefficient of friction up to Reynolds number of 109 and to evaluate the total ship resistance for the Semi-SWATH (fast vessel) and KVLCC (slow trading ships). The results show that the percentage increase in total ship resistance for the KVLCC is about 80%, which is more than the Semi-SWATH of 30%, as frictional resistance has high significance for slow trading ships. The speed drop experienced by the ship model installed with the microfiber antifouling is 2 knots for the KVLCC and 1 knot for the Semi-SWATH if the power remained the same for both models.

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Visual LOS Guided Docking of Over-actuated Underwater Vehicle

Xia²,

Dong

et al. 2020

Global Oceans 2020: Singapore – U.S. Gulf Coast

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Underwater Target Tracking of Offshore Crane System in Subsea Operations

Cited by 8 publications

References 19 publications

Dynamic Analysis and Safety Assessment of Ships and Cables during Salvage Operations

Dynamic Analysis and Safety Assessment of Ships and Cables during Salvage Operations

Investigate the Drag Resistance of Antifouling Self-Adhesive Film

Visual LOS Guided Docking of Over-actuated Underwater Vehicle

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