Computer Simulation of Moored Ship Motion Considering Harbor Resonance in Pohang New Harbor

Kwak, Min Seob; Pyun, Chongkun

doi:10.1061/9780784413067.145

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The second step involves simulating the behaviour of the moored ship in the time domain frame by applying the impulse response technique (Cummins, 1962). At this stage, the external forces due to the mooring lines and fenders can be introduced into the dynamic system (Kwak and Pyun, 2013).…”

Section: Mooring Analysesmentioning

confidence: 99%

A Review of Ship Mooring Systems

Villa

Carral²,

Fraguela

et al. 2017

brod

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The physical principle that governs how ships are moored to a port has changed little over the years. Nevertheless, in recent decades, there have been developments in maritime transport towards increased vessel dimensions and operations in specialist terminals. These trends mean that offshore ports and mooring systems have to face more challenging conditions in terms of the waves, wind and drift current. At the same time, pier side port loading and unloading systems place demands on the mooring system, which must immobilise ships better. In this situation, the mooring system's own equipment, such as lines, deck fittings and mooring winches, must also evolve to work alongside new port devices. It is also necessary to point out that changes in mooring will take place in subsequent years. These innovations in attaching the ship to the pier will be highlighted here as they mark a significant change in mooring and pier components.

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Section: Mooring Analysesmentioning

confidence: 99%

A Review of Ship Mooring Systems

Villa

Carral²,

Fraguela

et al. 2017

brod

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“…These include decrease in operation efficiency, breaking of mooring lines, or even damages to the vessel and port facilities. Excessive motions are usually caused by wave action and related phenomena, such as long waves or harbor resonance (González-Marco et al, 2008;Kwak and Pyun, 2013;Sakakibara et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Operational thresholds of moored ships at the oil terminal of inner port of A Coruña (Spain)

et al. 2019

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Minimizing the stay of a vessel in port can lead to improvements in harbor efficiency. Currently, downtimes of cargo operations or their performance reduction because of excessive vessel motion are especially relevant. This work aims to evaluate the operational conditions of moored vessels in the inner port of A Coruña (Spain), comparing them with motion thresholds established by international standards for cargo operations. To this end, motions of 19 ships were monitored. Data analysis revealed large angular motions, particularly roll and yaw, including amplitudes that exceeded the limiting criteria of the standards in most of the analyzed vessels, with no registered downtime. Regarding linear movements, heave and surge recorded lower amplitudes compared to the values of standard thresholds. The specific behavior of each vessel was analyzed in terms of its size, maritime conditions, and mooring location. Field campaigns such as those performed in this work are an effective way of analyzing the operational conditions of ports, which could help in identifying problems in the mooring zone.

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“…There are only two examples where an extensive monitoring campaign was carried out with different vessel typologies during operation [22,23]. During the past decades, this type of work has focused mainly on the study of the long wave [21,[24][25][26] and to validate physical or numerical models [13,27].…”

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confidence: 99%

Machine Learning Based Moored Ship Movement Prediction

Alvarellos

Figuero

Carro

et al. 2021

JMSE

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Several port authorities are involved in the R+D+i projects for developing port management decision-making tools. We recorded the movements of 46 ships in the Outer Port of Punta Langosteira (A Coruña, Spain) from 2015 until 2020. Using this data, we created neural networks and gradient boosting models that predict the six degrees of freedom of a moored vessel from ocean-meteorological data and ship characteristics. The best models achieve, for the surge, sway, heave, roll, pitch and yaw movements, a 0.99, 0.99, 0.95, 0.99, 0.98 and 0.98 R2 in training and have a 0.10 m, 0.11 m, 0.09 m, 0.9°, 0.11° and 0.15° RMSE in testing, all below 10% of the corresponding movement range. Using these models with forecast data for the weather conditions and sea state and the ship characteristics and berthing location, we can predict the ship movements several days in advance. These results are good enough to reliably compare the models' predictions with the limiting motion criteria for safe working conditions of ship (un) loading operations, helping us decide the best location for operation and when to stop operations more precisely, thus minimizing the economic impact of cargo ships unable to operate.

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Computer Simulation of Moored Ship Motion Considering Harbor Resonance in Pohang New Harbor

Cited by 6 publications

References 6 publications

A Review of Ship Mooring Systems

A Review of Ship Mooring Systems

Operational thresholds of moored ships at the oil terminal of inner port of A Coruña (Spain)

Machine Learning Based Moored Ship Movement Prediction

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