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Research Papers: Ocean Renewable Energy

Numerical Analysis and Scaled High Resolution Tank Testing of a Novel Wave Energy Converter

[+] Author and Article Information
Joe Prudell

Columbia Power Technologies,
LLC 4920 SW 3rd Street, Suite A,
Corvallis, OR 97333

Joao Cruz

GL Garrad Hassan Ibérica SLU,
Rua Nova do Almada, No. 59, 2nd Floor,
Lisboa 1200-288, Portugal

Annette von Jouanne

School of Electrical Engineering
and Computer Science,
Oregon State University,
Corvallis, OR 97331

Dan Cox

O. H. Hinsdale Wave Research Laboratory,
Oregon State University,
Corvallis, OR 97331

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 28, 2011; final manuscript received February 4, 2013; published online September 4, 2013. Assoc. Editor: Hideyuki Suzuki.

J. Offshore Mech. Arct. Eng 135(4), 041901 (Sep 04, 2013) (10 pages) Paper No: OMAE-11-1021; doi: 10.1115/1.4024886 History: Received February 28, 2011; Revised February 04, 2013

This paper presents a novel point absorber wave energy converter (WEC), developed by Columbia Power Technologies (COLUMBIA POWER), in addition to the related numerical analysis and scaled wave tank testing. Three hydrodynamic modeling tools are employed to evaluate the performance of the WEC, including WAMIT, GL Garrad Hassan's GH WaveDyn, and OrcaFlex. GH WaveDyn is a specialized numerical code being developed specifically for the wave energy industry. Performance and mooring estimates at full scale are evaluated and optimized, followed by the development of a 1:33 scale physical model. The physical tests of the 1:33 scale model WEC were conducted at the multidirectional wave basin of Oregon State University's O.H. Hinsdale Wave Research Laboratory, in conjunction with the Northwest National Marine Renewable Energy Center (NNMREC). This paper concludes with an overview of the next steps for the modeling program and future experimental test plans.

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References

Hughes, S. A., 1993, Physical Models and Laboratory Techniques in Coastal Engineering, World Scientific Advanced Series on Ocean Engineering, Vol. 7, World Scientific, Hackensack, NJ.
Cruz, J., ed., 2008, Ocean Wave Energy: Current Status and Future Prespectives, Springer, New York.
Budal, K., and Falnes, J., 1975, “A Resonant Point Absorber of Ocean-Wave Power,” Nature, 256, pp. 478–479. [CrossRef]
Rhinefrank, K., Prudell, J., and Schacher, A., 2009, “Development and Characterization of a Novel Direct Drive Rotary Wave Energy Point Absorber,” Proceedings of the MTS–IEEE Oceans Conference.
Rhinefrank, K., Schacher, A., Prudell, J., Cruz, J., Jorge, N., Stillinger, C., Naviaux, D., Brekken, T., von Jouanne, A., Newborn, D., Yim, S., and Cox, D., 2010, “Numerical and Experimental Analysis of a Novel Wave Energy Converter,” Proceedings of the OMAE2010 29th International Conference on Offshore Mechanics and Arctic Engineering, Shanghai, P. R. C., Paper No. OMAE2010-20901.
Rhinefrank, K., Schacher, A., Prudell, J., Stillinger, C., Naviaux, D., Brekken, T., von Jouanne, A., Newborn, D., Yim, S., and Cox, D., 2010, “High Resolution Wave Tank Testing of Scaled Wave Energy Devices,” Proceedings of the OMAE2010 29th International Conference on Offshore Mechanics and Arctic Engineering, Shanghai, P. R. C.

Figures

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Fig. 2

WEC wireframe in OrcaFlex

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Fig. 3

Diagram of linear to rotary damper arrangement

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Fig. 4

Directional wave basin at Oregon State University

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Fig. 1

Columbia Power's “Manta” wave energy buoy

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Fig. 10

Plot of aft float torque versus speed (top) plot of forward float torque versus speed (bottom)

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Fig. 5

PhaseSpace axis alignment square leveled in the wave basin

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Fig. 6

PhaseSpace LED marker poles for WEC rigid body tracking

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Fig. 7

Screen shot of dSPACE GUI during testing

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Fig. 8

Forward and aft floats angular position for both PhaseSpace and the Encoders. Data samples were taken every 20 ms.

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Fig. 9

Close up of PTO position time series. Data samples were taken every 20 ms.

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Fig. 11

Plot of commanded torque and measured torque

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Fig. 12

Numerical (–) versus experimental (o) RCW

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Fig. 13

Relative pitch RAO comparison, numerical (–) versus experimental (◻), aft float plot (top), forward float plot (bottom)

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Fig. 14

Model versus experimental surge displacement

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