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Research Papers: Ocean Renewable Energy

Dynamic Analysis of a Truss Spar-Type Floating Foundation for 5 MW Vertical-Axis Wind Turbine

[+] Author and Article Information
Liqin Liu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: liuliqin@tju.edu.cn

Weichen Jin

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: blue_sky_jin@126.com

Ying Guo

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300072, China
e-mail: yynocry@tju.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 September 30, 2016; final manuscript received June 12, 2017; published online August 16, 2017. Assoc. Editor: Yin Lu Young.

J. Offshore Mech. Arct. Eng 139(6), 061902 (Aug 16, 2017) (9 pages) Paper No: OMAE-16-1120; doi: 10.1115/1.4037292 History: Received September 30, 2016; Revised June 12, 2017

This paper studies the dynamic characteristic of the truss Spar-type floating foundation used to support the offshore vertical-axis wind turbine (VAWT). The effects of changes in foundation structural parameters on its motions were evaluated. The results show that radius of the buoyancy tank, radius of the upper mechanical tank, interval of the center of gravity and center of buoyancy, and height of the upper mechanical tank have important effects on the heave and pitch motions of the foundation. Two sets of foundation parameters (FS-1 and FS-2) were selected to support the 5 MW Darrieus wind turbine. The motion performances of the two floating VAWTs, S-1 (the VAWT supported by FS-1) and S-2 (the VAWT supported by FS-2), were analyzed and compared. It was observed that the amplitudes of the heave and pitch motions of the floating VAWT depend on the wave loads; the mean values of the heave and pitch motions depend on the aerodynamic loads. The floating VAWT S-2 had better motion performance; its heave and pitch motions were all small. The heave frequencies of the floating VAWT were equal to the wave frequencies. For the pitch frequencies, there is a component of the rotor rotational frequency (0.175 Hz) for cases LC1 to LC4, while the amplitudes of the twice-per-revolution (2P) response are far smaller than the amplitudes of the wave response.

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Figures

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Fig. 1

The floating VAWT: (1) blades, (2) tower, (3) upper buoyancy tank, (4) upper mechanical tank, (5) truss structure, (6) heaving plate, and (7) bottom ballast tank

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Fig. 2

Diagram of the floating foundation

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Fig. 3

Hydrodynamic calculation models: (a) panel model and (b) Morison model

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Fig. 4

Analysis of BG¯: (a) max RAOs and (b) natural periods

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Fig. 5

Analysis of R1: (a) max RAOs and (b) natural periods

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Fig. 6

Analysis of R2: (a) max RAOs and (b) natural periods

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Fig. 7

Analysis of H1: (a) max RAOs and (b) natural periods

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Fig. 8

Analysis of L1: (a) max RAOs and (b) natural periods

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Fig. 9

Analysis of H2: (a) max RAOs and (b) natural periods

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Fig. 10

Analysis of the heave of the floating foundation: (a) variations of max RAOs and (b) variations of natural period

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Fig. 11

Analysis of the pitch of the floating foundation: (a) variations of max RAOs and (b) variations of natural period

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Fig. 12

Heave motions of the floating VAWT

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Fig. 13

Pitch motions of the floating VAWT

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Fig. 14

Heave spectrums of the floating VAWT

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Fig. 15

Pitch spectrums of the floating VAWT

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