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.

References

References
1.
Sclavounos
,
P. D.
,
2012
, “
Nonlinear Impulse of Ocean Waves on Floating Bodies
,”
J. Fluid Mech.
,
697
, pp.
316
335
.
2.
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.
3.
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
4.
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.
5.
Winterstein
,
S. R.
, and
MacKenzie
,
C. A.
,
2013
, “
Extremes of Nonlinear Vibration: Comparing Models Based on Moments, L-Moments and Maximum Entropy
,”
ASME J. Offshore Mech. Arct. Eng.
,
135
(2), p. 021602.
6.
Kac
,
M.
, and
Siegert
,
A. J. F.
,
1947
, “
On the Theory of Noise in Radio Receivers With Square Law Detectors
,”
J. Appl. Phys.
,
18
(
4
), pp.
383
400
.
7.
Winterstein
,
S. R.
,
Ude
,
T. C.
, and
Kleiven
,
G.
,
1994
, “
Springing and Slow-Drift Responses: Predicted Extremes and Fatigue vs. Simulation
,”
BOSS-94 Conference
, Cambridge MA, pp. 1–15.https://www.researchgate.net/publication/267967111_SPRINGING_AND_SLOW-DRIFT_RESPONSES_PREDICTED_EXTREMES_AND_FATIGUE_VS_SIMULATION
8.
Wehausen
,
J.
, and
Laitone
,
E.
,
1960
, “
Surface Waves
,”
Fluid Dynamics/Strömungsmechanik
, Springer, Berlin, pp.
446
778
.
9.
Lee
,
C.-H.
,
1995
, “
WAMIT Theory Manual
,” Massachusetts Institute of Technology, Cambridge, MA.
10.
Robertson
,
A. N.
,
Wendt
,
F. F.
,
Jonkman
,
J. M.
,
Popko
,
W.
,
Vorpahl
,
F.
,
Stansberg
,
C. T.
,
Bachynski
,
E. E.
,
Bayati
,
I.
,
Beyer
,
F.
,
de Vaal
,
J. B.
, and
Harries
,
R.
,
2015
, “
OC5 Project Phase I: Validation of Hydrodynamic Loading on a Fixed Cylinder
,”
25th International Offshore and Polar Engineering Conference. International Society of Offshore and Polar Engineers
, Kona, HI, June 21–26.https://www.onepetro.org/conference-paper/ISOPE-I-15-116
11.
Naess
,
A.
, and
Moan
,
T.
,
2013
,
Stochastic Dynamics of Marine Structures
,
Cambridge University Press
,
Cambridge, UK
.
12.
Moreno-Salinas
,
D.
,
Chaos
,
D.
,
de la Cruz
,
J. M.
, and
Aranda
,
J.
,
2013
, “
Identification of a Surface Marine Vessel Using LS-SVM
,”
J. Appl. Math.
, 2013, p.
803648
.
13.
Luo
,
W.
,
Soares
,
C. G.
, and
Zou
,
Z.
,
2016
, “
Parameter Identification of Ship Maneuvering Model Based on Support Vector Machines and Particle Swarm Optimization
,”
ASME J. Offshore Mech. Arct. Eng.
,
138
(
3
), p.
031101
.
You do not currently have access to this content.