Identification of Nonlinear Wave Forces Using Gaussian Process NARX Models

As the offshore fixed wind turbine developed, more ones will be installed in the sea field with the depth 15–50 meters. Wave force will be one of the main forces that dominate the design of the wind turbine base, which is calculated using the Morison equation traditionally. This method can predict the wave forces for the small cylinders if the drag and inertia coefficients are obtained accurately. This paper will give a series scaled tests of monopile and jacket type base of the offshore wind turbine in tank to study the nonlinear wave loads.

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A Method for Analysis of a Prototype Articulated Multiline Marine Production Riser System

Journal of Pressure Vessel Technology ◽

10.1115/1.3454503 ◽

1977 ◽

Vol 99 (1) ◽

pp. 170-175

Author(s):

J. B. Caldwell ◽

W. E. Gammage

Keyword(s):

Computer Program ◽

Nonlinear Wave ◽

Analytical Method ◽

Tropical Storm ◽

Wave Forces ◽

Internal Reaction ◽

Reaction Forces

This paper describes a newly developed nonlinear computer program that predicts internal reaction forces and motions of a multiline marine production riser exposed to wave and current forces. The paper also presents an analytical method that accounts for large geometric displacements and nonlinear wave forces. A simulation of the response of a prototype articulated multiline marine production riser during a mild tropical storm illustrates the program’s capability.

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The influence of fully nonlinear wave forces on aero-hydro-elastic calculations of monopile wind turbines

Marine Structures ◽

10.1016/j.marstruc.2016.06.004 ◽

2016 ◽

Vol 50 ◽

pp. 162-188 ◽

Cited By ~ 29

Author(s):

Signe Schløer ◽

Henrik Bredmose ◽

Harry B. Bingham

Keyword(s):

Nonlinear Wave ◽

Wind Turbines ◽

Wave Forces ◽

Fully Nonlinear

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Study on Nonlinear Wave Forces on Plural Vertical Cylinder with Arbitrary Cross-Sections

Journal of the Society of Naval Architects of Japan ◽

10.2534/jjasnaoe1968.1986.160_176 ◽

1986 ◽

Vol 1986 (160) ◽

pp. 176-184 ◽

Cited By ~ 1

Author(s):

Koichi Masuda ◽

Chikahiro Sakata ◽

Wataru Kato

Keyword(s):

Nonlinear Wave ◽

Cross Sections ◽

Vertical Cylinder ◽

Wave Forces

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Nonlinear Wave Forces Acting on Submerged Horizontal Cylinders

Journal of Offshore Mechanics and Arctic Engineering ◽

10.1115/1.3257125 ◽

1988 ◽

Vol 110 (1) ◽

pp. 62-70 ◽

Cited By ~ 1

Author(s):

R. Inoue ◽

Y. Kyozuka

Keyword(s):

Perturbation Theory ◽

Free Surface ◽

Nonlinear Wave ◽

Wave Breaking ◽

Nonlinear Effects ◽

Second Order ◽

Experimental Results ◽

Wave Forces ◽

Regular Perturbation ◽

Horizontal Cylinders

This paper is to present experimental results of the first and second-order wave forces acting on three kinds of horizontally submerged cylinders. Wave height, wave frequency and the models’ submergence were varied in the experiments. These results are compared with the numerical calculations based on the regular perturbation theory. Through this study, it was found that the calculations of both the first and second-order wave forces coincide with the experiments when the cylinders are submerged at a sufficient depth. However, in the case that the cylinders are close to the free surface and/or wave amplitudes are relatively large, the experimental results become small compared with the calculations because of nonlinear effects, such as wave breaking observed in the experiments.

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