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Research Papers: Ocean Renewable Energy

Offshore Wind Turbine Nonlinear Wave Loads and Their Statistics

[+] Author and Article Information
Paul D. Sclavounos

Massachusetts Institute of Technology,
77 Massachusetts Avenue, 5-320,
Cambridge, MA 02139
e-mail: pauls@mit.edu

Yu Zhang

Massachusetts Institute of Technology,
77 Massachusetts Avenue, 5-329,
Cambridge, MA 02139
e-mail: yu_zhang@mit.edu

Yu Ma

Massachusetts Institute of Technology,
77 Massachusetts Avenue, 5-329,
Cambridge, MA 02139
e-mail: yuma@mit.edu

David F. Larson

Massachusetts Institute of Technology,
77 Massachusetts Avenue, 5-329,
Cambridge, MA 02139
e-mail: dflarson@mit.edu

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 26, 2017; final manuscript received September 24, 2018; published online January 22, 2019. Assoc. Editor: Carlos Guedes Soares.

J. Offshore Mech. Arct. Eng 141(3), 031904 (Jan 22, 2019) (8 pages) Paper No: OMAE-17-1227; doi: 10.1115/1.4042264 History: Received December 26, 2017; Revised September 24, 2018

The development of an analytical model for the prediction of the stochastic nonlinear wave loads on the support structure of bottom mounted and floating offshore wind turbines is presented. Explicit expressions are derived for the time-domain nonlinear exciting forces in a sea state with significant wave height comparable to the diameter of the support structure based on the fluid impulse theory (FIT). The method is validated against experimental measurements with good agreement. The higher order moments of the nonlinear load are evaluated from simulated force records and the derivation of analytical expressions for the nonlinear load statistics for their efficient use in design is addressed. The identification of the inertia and drag coefficients of a generalized nonlinear wave load model trained against experiments using support vector machine learning algorithms is discussed.

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References

Sclavounos, P. D. , 2012, “Nonlinear Impulse of Ocean Waves on Floating Bodies,” J. Fluid Mech., 697, pp. 316–335. [CrossRef]
Sclavounos, P. D. , 2016, “Nonlinear Loads on a Vertical Circular Cylinder,” 31st International Workshop on Water Waves and Floating Bodies, Plymouth, MI, Apr. 3–6, pp. 153–156.
Zhang, Y. , 2015, “Wave Loads on Offshore Wind Turbines,” M.S. thesis, Massachusetts Institute of Technology, Cambridge, MA. http://hdl.handle.net/1721.1/100344
Sclavounos, P. D. , Zhang, Y. , Ma, Y. , and Larson, D. F. , “Offshore Wind Turbine Nonlinear Wave Loads and Their Statistics,” ASME Paper No. OMAE2017-61184.
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Figures

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Fig. 2

FIT linear model verification with WAMIT'S results

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Fig. 3

FIT full model validation with experimental wave loads

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Fig. 5

Nonlinear wave load (convective term)

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Fig. 6

Nonlinear wave load (waterline term)

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Fig. 7

Nonlinear wave load (second-order disturbance potential term)

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Fig. 8

Nonlinear wave load (second-order incident potential term)

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Fig. 10

Variance of the linear (a), linear + nonlinear (b), and linear + nonlinear + viscous (c) wave load

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Fig. 11

Variance of the nonlinear wave load including second-order incident wave effect

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Fig. 12

Kurtosis of the nonlinear wave load including second-order incident wave effect

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Fig. 13

Kurtosis of the linear (a), linear + nonlinear (b), and linear + nonlinear + viscous (c) wave load

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Fig. 14

Nonlinear horizontal load in finite water depth

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Fig. 15

Nonlinear mudline bending moment in finite water depth

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Fig. 16

Bending moment probability of exceedance. Fit versus experiment versus linear theory.

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