Failure analysis of naval vessel's mooring system and suggestion of reducing mooring line tension under ocean wave excitation

Lee, Kyoung-Hyun; Han, Hyung-Suk; Park, Sungho

doi:10.1016/j.engfailanal.2015.08.005

Cited by 15 publications

(6 citation statements)

References 3 publications

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“…As a significant component of a sea lock, the normal service of an FB is key to ensuring the safe operation and efficient navigation of a lock. However, large ships, excessive speeds of entry, irregular mooring, and other factors, including corrosion caused by chloride salts from the environment as a result of seawater intrusion, aggravate the damaging and destruction of metal structures and seriously threaten the service safety of FBs [20][21][22][23][24][25]. In addition, damage to the main structure of an FB induces deformation of the guide trough and blockage of the pulley, which leads to accidents such as pulling the ship into the water, damaging the hull, and causing casualties, resulting in very large economic losses and negative impacts on society.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Xiang

Shu³

et al. 2023

JMSE

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Sea locks that connect inland canals and rivers to the open sea are crucial links that ensure the efficient navigation of ships. Floating bollards (FBs) are significant components of sea locks, and they are affected by factors such as large ships, speed of entry, and irregular mooring lines coupled with corrosion by chloride salts from seawater intrusion from the environment. These factors aggravate damage to metal structures, which seriously threatens the safety of FBs. Overloading of FBs by mooring forces caused by the illegal use of FBs for the braking of large ships that enter locks at excessive speed is the main cause of structural damage and overload failure for FBs. Controlling the dynamic mooring force acting on the FB is an important prerequisite to ensure the safe passage of a ship through a lock. It is impossible to perform real-time monitoring of the magnitude and direction of the mooring force on an FB by installing load-measuring equipment on the mooring line. Therefore, in this study, the structure of an FB in a sea lock project was taken as an example, and the mathematical relationships between the strain in the load-sensitive area of the FB and the mooring force and the mooring angle were quantified. A dynamic inversion model of the ship mooring force on an FB was proposed. This model used real-time feedback from the strain signal in the load-sensitive region of the FB structure to obtain information about the mooring force. The accuracy of the model was verified by conducting tests with a physical model of the topside structure of the FB and comparing the predicted results with the test data. The research results can lay a theoretical foundation for real-time monitoring of the structural response of an FB under the action of mooring forces and promote the development of intelligent methods for the operation and maintenance of a sea lock, which have important scientific significance and engineering value.

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Section: Introductionmentioning

confidence: 99%

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Xiang

Shu³

et al. 2023

JMSE

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“…Their aimed to provide valuable insights for improving port planning related to anchorage. Lee et al [30] conducted a failure analysis on a ship that experienced anchor failure in a port, revealing that wave drift forces could lead to the failure of mooring systems. They suggested new mooring system designs considering wave loads for port planning.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis for Estimation of Mooring Force Acting on Various Ships in Busan New Port

Yan,

Oh,

Seo

2023

JMSE

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Recently, smart port systems connected to autonomous ships have attracted increasing interest. Thus, an intelligent port system can automatically berth to create an intelligent port system. To ensure the safety of large ships moored in open coastal terminals, which are often subjected to bad weather such as strong winds, it is necessary to calculate and evaluate their mooring security on a case-by-case basis. In this study, the mooring capacities of the large ships were estimated according to the port and fishing port design criteria of the Ministry of Ocean and Fisheries. Under the wind speed of 14 m/s, the longitudinal and lateral forces acting on the JBC, KCS, and KVLCC ships are 41.2 and 340 kN, 38.7 and 837 kN, and 77.2 and 222 kN, while under the wind speed of 30 m/s, they are 43 and 1674 kN, 132.7 and 4118 kN, and 159.2 and 1091 kN, respectively, for the mooring forces.

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“…At the same time, the suction anchor foundation is a large structure with the tens of meters height and considerable costs [20,21]. Although there are some studies on subsea manifolds, buoy [22][23][24][25], flexible pipes or risers [26][27][28][29][30][31] and mooring systems [32][33][34][35][36][37], there is no such concept that combines the two parts and keeps manifold suspending in the water and creates a 3D subsea production system. Here, the new subsea manifold is suspended with the buoy, and the flexible pipes may be used to be the mooring systems as well as the transporting oil and gas pipelines.…”

Section: Introductionmentioning

confidence: 99%

The motion response and hydrodynamic performance comparisons of the new subsea suspended manifold with two mooring scenarios

Wang

Chen

et al. 2021

J Braz. Soc. Mech. Sci. Eng.

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The subsea manifold as the hub oil and gas transportation equipment is a critical part for the layout optimization of subsea production system and reducing the number of pipelines. The traditional subsea manifold is fixed on seabed by its foundation, so traditional manifold system is hard to be discarded and recovered although it has many advantages and is applied widely in the deep water development scenario. In this paper, a new subsea suspended manifold concept is proposed to discuss its feasibility by the hydrodynamic performance state in vertical tension and catenary mooring methods. A mathematical model is established to solve the chain tension distribution and displacement of the subsea suspended manifold. Meanwhile, the motion response of the subsea suspended manifold under different influence factors, tension distribution of the mooring chains and the flexible jumpers in two mooring schemes are simulated, respectively, through OrcaFlex software. The research results will provide an important reference for the optimization of the preliminary scenario design of the subsea suspended manifold mooring system.

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Failure analysis of naval vessel's mooring system and suggestion of reducing mooring line tension under ocean wave excitation

Cited by 15 publications

References 3 publications

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Dynamic Inversion Model of the Mooring Force on a Floating Bollard of a Sea Lock

Computational Analysis for Estimation of Mooring Force Acting on Various Ships in Busan New Port

The motion response and hydrodynamic performance comparisons of the new subsea suspended manifold with two mooring scenarios

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