Cause and countermeasure of long-period oscillations of moored ships and the quantification of surge and heave amplitudes

Uzaki, Ken Ichi; Matsunaga, Nobuhiro; Nishii, Yasuhiro; Ikehata, Yoshito

doi:10.1016/j.oceaneng.2009.12.004

Cited by 22 publications

(11 citation statements)

References 6 publications

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“…The boundary nodes j = 0 and N become the internal nodes in this case. Therefore, equation (2) can be applied to the two nodes j = 0 and N and becomes…”

Section: Prediction Of the Response Amplitudesmentioning

confidence: 99%

Improvements on the normal mode decomposition method used in harbor resonance

Gao

Dong

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part M:

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In the article by Sobey (Rodney J. Sobey, 2006. Normal mode decomposition for identification of storm tide and tsunami hazard. Coastal Engineering 53, 289-301), the author proposed a normal mode decomposition method to calculate the eigenfrequencies, the eigenmodes and the response amplitudes of different resonant modes in natural harbors that are subjected to storm tides and tsunamis. However, the numerical method to address the no-flow boundary condition in that article is imprecise, which would lead to inexact eigenfrequencies and eigenmodes. In this article, the mirror-image method was proposed to improve this handling process. The accuracy of the improved normal mode decomposition method was verified using three verification tests. With a set of numerical experiments, it was determined that during the process of decomposing the response amplitudes of different resonant modes, the numerical fitting error between the simulated free surfaces and the corresponding fitted ones gradually increases with the wave nonlinearity inside the harbor. This article sought to identify the critical wave condition under which the normal mode decomposition method can accurately decompose the response amplitudes of different modes.

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“…The boundary nodes j = 0 and N become the internal nodes in this case. Therefore, equation (2) can be applied to the two nodes j = 0 and N and becomes…”

Section: Prediction Of the Response Amplitudesmentioning

confidence: 99%

Improvements on the normal mode decomposition method used in harbor resonance

Gao

Dong

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part M:

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show abstract

“…Resonance, when the period of incident infragravity waves is close to natural oscillation periods (NOPs) of the water basin, generates higher amplitude oscillations causing undesirable water motions. Such conditions interrupt berthing operations, further resulting in harbour downtime followed by economic losses (McComb et al, 2005;Van der Molen et al, 2006;Rabinovich, 2009;Uzaki et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Observations of infragravity period oscillations in a small marina

Thotagamuwage

Pattiaratchi

2014

Ocean Engineering

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“…The first group includes 'hard solutions' involving changes in the port infrastructures. These may entail: reducing the wave reflection coefficient of the target berth (Uzaki et al, 2010); reducing the wave penetration by extending breakwaters (McComb et al, 2009) or reducing resonance by modifying the harbour layout (Bellotti, 2007). The second group are seen as 'soft solutions' that, by modifying the mooring system, can be an effective and low-cost countermeasure (Sakakibara and Kubo, 2008a).…”

Section: Mooring System/arrangement Modificationmentioning

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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Cause and countermeasure of long-period oscillations of moored ships and the quantification of surge and heave amplitudes

Cited by 22 publications

References 6 publications

Improvements on the normal mode decomposition method used in harbor resonance

Improvements on the normal mode decomposition method used in harbor resonance

Observations of infragravity period oscillations in a small marina

A Review of Ship Mooring Systems

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