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Special Section Articles

Aero-Elastic-Control-Floater-Mooring Coupled Dynamic Analysis of Floating Offshore Wind Turbine in Maximum Operation and Survival Conditions

[+] Author and Article Information
Y. H. Bae

Department of Civil Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: yoonhyeok.bae@tamu.edu

M. H. Kim

Department of Civil Engineering,
Texas A&M University,
College Station, TX 77843
e-mail: m-kim3@tamu.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 July 31, 2012; final manuscript received May 8, 2013; published online March 24, 2014. Assoc. Editor: Krish Thiagarajan.

J. Offshore Mech. Arct. Eng 136(2), 020902 (Mar 24, 2014) (13 pages) Paper No: OMAE-12-1079; doi: 10.1115/1.4025029 History: Received July 31, 2012; Revised May 08, 2013

Increasing numbers of floating offshore wind turbines (FOWTs) are planned in the coming years due to their high potential in the massive generation of clean energy from ocean wind. In the present study, a numerical prediction tool has been developed for the fully coupled dynamic analysis of an FOWT system in the time domain including aero-loading, tower/blade elasticity, blade-rotor dynamics and control, mooring dynamics, and platform motions so that the influence of aero-elastic-control dynamics on the hull-mooring performance and vice versa can be assessed. The Hywind spar design with a 5 MW National Renewable Energy Laboratory (NREL) turbine is selected as an example and two different collinear wind-wave-current environmental conditions, maximum operational and survival conditions, are applied for this study. The maximum operational condition means the maximum environmental condition with normal blade-turbine operation and the survival condition represents the extreme situation without any blade-turbine operation. Through this study, it is seen that the ultimate-loading environments for different structural components of the FOWT can be different. The developed technology and numerical tool are readily applicable to the design of any type of future FOWTs in any combinations of irregular waves, dynamic winds, and steady currents.

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References

Figures

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Fig. 1

Basic concept of the CHARM3D-FAST hybrid model

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Fig. 2

Mooring-line arrangement

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Fig. 3

Normalized mode shapes of (a) tower fore-aft, (b) tower side-to-side, and (c) blades

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Fig. 4

Discretized panel model of the spar hull

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Fig. 5

(a) Time histories and (b) spectra of the wind speed at the hub position

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Fig. 6

(a) Time histories and (b) spectra of the wave elevation

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Fig. 7

(a) Time histories and (b) spectra of the blade pitch angle

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Fig. 8

(a) Time histories and (b) spectra of the rotor speed

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Fig. 9

(a) Time histories and (b) spectra of the surge wave loading

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Fig. 10

(a) Time histories and (b) spectra of the pitch wave loading

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Fig. 11

(a) Time histories and (b) spectra of the tower wind loading

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Fig. 14

(a) Time histories and (b) spectra of the shaft thrust in survival condition

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Fig. 28

(a) Time histories and (b) spectra of the tower top acceleration

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Fig. 15

(a) Time histories and (b) spectra of the surge motion

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Fig. 16

(a) Time histories and (b) spectra of the sway motion

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Fig. 17

(a) Time histories and (b) spectra of the heave motion

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Fig. 18

(a) Time histories and (b) spectra of the roll motion

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Fig. 19

(a) Time histories and (b) spectra of the pitch motion

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Fig. 20

(a) Time histories and (b) spectra of the yaw motion

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Fig. 21

(a) Time histories and (b) spectra of the tower fore-aft shear force

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Fig. 22

(a) Time histories and (b) spectra of the tower side-to-side shear force

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Fig. 23

(a) Time histories and (b) spectra of the tower fore-aft bending moment

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Fig. 24

Top view of the mooring-line arrangement

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Fig. 25

(a) Top-tension time histories and (b) spectra of line no. 1

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Fig. 26

(a) Top-tension time histories and (b) spectra of line no. 2

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Fig. 27

(a) Top-tension time histories and (b) spectra of line no. 3

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Fig. 12

(a) Time histories and (b) spectra of the blade wind loading (rotor thrust)

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Fig. 13

(a) Time histories and (b) spectra of the shaft thrust in maximum operational condition

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Fig. 29

(a) Flapwise and (b) edgewise blade shear force

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Fig. 30

(a) Time histories and (b) spectra of the flapwise shear force at the blade root

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Fig. 31

(a) Time histories and (b) spectra of the edgewise shear force at the blade root

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