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Research Papers: Ocean Renewable Energy

Coupled Dynamic Analysis of a Tension Leg Platform Floating Offshore Wind Turbine

[+] Author and Article Information
Teng Wang

Department of Naval Architecture and Offshore Engineering,
China University of Petroleum (East China),
No. 66, Changjiang West Road, Huangdao District, Qingdao 266580, China
e-mail: wteng73@upc.edu.cn

Hui Jin

Department of Offshore Engineering,
China Petroleum Pipeline Engineering Company,
No. 146, Heping Road, Langfang 065000, China
e-mail: jinhuiauh@163.com

Xiaoni Wu

State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering,
Shanghai Jiao Tong University,
No. 800, Dongchuan Road, Shanghai 200240, China
e-mail: wuxiaoni@sjtu.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the Journal of Offshore Mechanics and Arctic Engineering. Manuscript received April 2, 2019; final manuscript received June 16, 2019; published online July 17, 2019. Assoc. Editor: Madjid Karimirad.

J. Offshore Mech. Arct. Eng 142(1), 011901 (Jul 17, 2019) (9 pages) Paper No: OMAE-19-1054; doi: 10.1115/1.4044075 History: Received April 02, 2019; Accepted June 18, 2019

The dynamic response of a tension leg platform (TLP) floating offshore wind turbine (FOWT) was analyzed with considering the aero-hydro characteristic of the whole floating wind turbine system including the wind turbine, TLP platform, and tethers. The “aero-hydro” coupled dynamic analysis was conducted in ansys-aqwa with a dynamic link library (DLL) calculating the aerodynamics loading at every steptime based on the blade element momentum theory. Results from the coupled dynamic analysis of TLP FOWT under the condition of turbulent wind and regular wave show that the wind loads influence mainly the low-frequency response of the TLP FOWT. The wind loads have a large impact on the offsets of the TLP away from the initial position while the wave loads influence mainly the fluctuation amplitude of the TLP FOWT. The average TLP pitch response under the wind load is significantly larger due to the large wind-induced heeling moment on the wind turbine. In addition, the tension of tethers at the upwind end is greater than that at the downwind end. The wind loads could reduce effectively the average tension of the tethers, and the tension of tethers is significantly affected by the pitch motion. Results from the coupled dynamic analysis of TLP FOWT under the condition of turbulent wind and irregular wave show that the surge and pitch of TLP result in an obvious increase of thrust of the turbine and the amplitude of torque fluctuation, more attention should be paid to the pitch and surge motion of TLP FOWT.

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Figures

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Fig. 1

Sketch of the TLP FOWT coordinate system and motions

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Fig. 2

Schematic of the annular stream at rotating actuator disc

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Fig. 3

Illustration of blade elements and forces acting on the airfoil

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Fig. 4

Panel model and arrangement of tendons

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Fig. 5

Flowchart of the TLP FOWT dynamic response analysis

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Fig. 6

Comparison of thrust and torque calculated from different numerical models

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Fig. 7

Response of the TLP FOWT motion

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Fig. 8

Top tension of #1 tendon for different cases

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Fig. 9

Top tension of tendons at different positions

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Fig. 10

Thrust and torque of the blade affected by the TLP motion

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