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Ocean Engineering

Estimating the Energy Production Capacity of a Taut-Moored Dual-Body Wave Energy Conversion System Using Numerical Modeling and Physical Testing

[+] Author and Article Information
D. Elwood

HDR Engineering, Inc., 5825 221st Place SE, Suite 202, Issaquah, WA 98027delwood@hdrinc.com

S. C. Yim

School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331-3212solomon.yim@oregonstate.edu

E. Amon

School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331-5501amon@eecs.oregonstate.edu

A. von Jouanne

School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331-5501avj@eecs.oregonstate.edu

T. K. A. Brekken

School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331-5501brekken@eecs.oregonstte.edu

J. Offshore Mech. Arct. Eng 133(3), 031102 (Mar 29, 2011) (9 pages) doi:10.1115/1.4003184 History: Received November 22, 2008; Revised August 10, 2010; Published March 29, 2011; Online March 29, 2011

This paper presents an innovative technique for evaluating the performance of direct-drive power take-off systems for wave energy devices using simulated force and velocity profiles. The performance of a linear generator was evaluated in a realistic operating condition using the results from a coupled model of a taut moored, dual body, and wave energy conversion system as position input for Oregon State University’s wave energy linear test bed. The experimental results from the linear test bed can be compared with the predictions of the simulation and used to evaluate the efficiency of the generator.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Rendering of spar and buoy general arrangement

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Figure 2

Geometry of the resized SeaBeavI

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Figure 3

Graphical representation of OrcaFlex line model showing springs and dampers used to represent the axial, torsional, and bending stiffness/structural damping (17)

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Figure 4

Mechanical power captured by the device as a function of the significant wave height

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Figure 5

Relationship between the significant wave height and the capture width for the resized SeaBeavI wave energy conversion device

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Figure 6

The active components of the permanent magnet linear generator mounted in OSU’s wave energy LTB

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Figure 7

The sum of the frictional and electromagnetic forces in a 2.5 m Hs 8.8 s. wave climate

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Figure 8

Measured bearing efficiency as a function of simulation wave height

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Figure 9

Measured generator efficiency as a function of simulation wave height

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Figure 10

Power curves for the resized SeaBeavI wave energy conversion system

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Figure 11

Resized SeaBeavI daily average energy production at Newport, OR test site

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Figure 12

(a) Axial and normal added mass coefficients for the buoy. (b) Axial and normal unit damping forces for the buoy.

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Figure 13

(a) Axial and normal added mass coefficients for the spar. (b) Axial and normal unit damping forces for the spar.

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