Hydrodynamic Responses Of Derrick Vessels In Waves During Heavy Lift Operation

Mukerji, P.K.

doi:10.4043/5821-ms

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The interaction should be properly included if the two structures are in close vicinity, e.g., the hydrodynamic interaction between a transport barge and a floating crane vessel during lift-off operations (Mukerji, 1988;van den Boom et al, 1990;Baar et al, 1992). These studies showed that the hydrodynamic interaction had little effect on the responses of the crane tip, but affected the responses of the transport barge because of the small dimension of the barge compared with the crane vessel (Baar et al, 1992).…”

Section: Multi-body Hydrodynamics Using Potential Theorymentioning

confidence: 99%

Operability Analysis of Monopile Lowering Operation Using Different Numerical Approaches

Li¹,

Gao²,

Moan³

2016

IJOPE

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Offshore installation operations require careful planning in the design phase to minimize associated risks. This study addresses numerical modelling and time-domain simulations of the lowering operation during installation of a monopile (MP) for offshore wind turbine (OWT) using a heavy lift vessel (HLV). The purpose is to apply different numerical approaches to obtain the allowable sea states and to assess the operability. Four critical factors regarding the numerical modelling approaches for the coupled HLV-MP lowering process are studied. Those factors include wave short crestedness, shielding effects from the HLV, radiation damping from MP and the nonstationarity of the process. The influence of each factor on the allowable sea states and the operability are assessed. A large number of time-domain simulations are performed considering random waves to derive the allowable sea states. The results indicate that the radiation damping from the MP is secondary while it is essential to consider the other features. The study can be used as a reference for numerical modelling of relevant offshore operations.

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Section: Multi-body Hydrodynamics Using Potential Theorymentioning

confidence: 99%

Operability Analysis of Monopile Lowering Operation Using Different Numerical Approaches

Li¹,

Gao²,

Moan³

2016

IJOPE

View full text Add to dashboard Cite

show abstract

“…Studies have been performed to investigate the heavy lifting operations in the oil and gas industry considering shielding effects, such as the lifting of a heavy load from a transport barge using a large capacity semi-submersible crane vessel (Mukerji, 1988;van den Boom et al, 1990;Baar et al, 1992). The studies found that the hydrodynamic interaction had little effect on the responses of the crane tip, but affected the responses of the transport barge and thus greatly affected the lifting operations because of the small dimension of the barge compared with that of the crane vessel (Baar et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Lifting Operation of a Monopile Considering Vessel Shielding Effects in Short-crested Waves

Lin

Gao

Moan

2016

IJOPE

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This paper addresses numerical simulations of the lifting operation of an offshore wind turbine monopile foundation considering both shielding effects from the vessel and the spreading of the waves. A numerical model of the coupled monopile-vessel system is established. The disturbed wave field near the vessel is investigated and observed to be affected by the diffraction and radiation of the vessel. The shielding effects of the vessel during the lifting operation are accounted for in this study by interpolating fluid kinematics between pre-defined wave points near the vessel using SIMO software and an external Dynamic Link Library (DLL). The effects of short-crested waves on the wave field and on responses of the system are investigated by implementing the directional spreading function in the wave spectrum. Based on the time-domain simulations, the critical responses of the lifting system in various conditions are studied. The results indicate that the effects of the wave spreading are considerable in both incident and disturbed waves. The shielding effects are less significant in short-crested waves than in long-crested waves.

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Response Analysis of a Nonstationary Lowering Operation for an Offshore Wind Turbine Monopile Substructure

Gao

Moan

2015

Journal of Offshore Mechanics and Arctic Engineering

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This study addresses numerical modeling and time-domain simulations of the lowering operation for installation of an offshore wind turbine monopile (MP) with a diameter of 5.7 m and examines the nonstationary dynamic responses of the lifting system in irregular waves. Due to the time-varying properties of the system and the resulting nonstationary dynamic responses, numerical simulation of the entire lowering process is challenging to model. For slender structures, strip theory is usually applied to calculate the excitation forces based on Morison's formula with changing draft. However, this method neglects the potential damping of the structure and may overestimate the responses even in relatively long waves. Correct damping is particularly important for the resonance motions of the lifting system. On the other hand, although the traditional panel method takes care of the diffraction and radiation, it is based on steady-state condition and is not valid in the nonstationary situation, as in this case in which the monopile is lowered continuously. Therefore, this paper has two objectives. The first objective is to examine the importance of the diffraction and radiation of the monopile in the current lifting model. The second objective is to develop a new approach to address this behavior more accurately. Based on the strip theory and Morison's formula, the proposed method accounts for the radiation damping of the structure during the lowering process in the time-domain. Comparative studies between different methods are presented, and the differences in response using two types of installation vessel in the numerical model are also investigated.

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Hydrodynamic Responses Of Derrick Vessels In Waves During Heavy Lift Operation

Cited by 3 publications

References 3 publications

Operability Analysis of Monopile Lowering Operation Using Different Numerical Approaches

Operability Analysis of Monopile Lowering Operation Using Different Numerical Approaches

Analysis of Lifting Operation of a Monopile Considering Vessel Shielding Effects in Short-crested Waves

Response Analysis of a Nonstationary Lowering Operation for an Offshore Wind Turbine Monopile Substructure

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