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Ocean Engineering

Experimental Force Characterization and Numerical Modeling of a Taut-Moored Dual-Body Wave Energy Conversion System

[+] Author and Article Information
D. Elwood, S. C. Yim

School of Civil and Construction Engineering, Oregon State University, Corvallis, OR 97331

E. Amon, A. von Jouanne, T. K. A. Brekken

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

J. Offshore Mech. Arct. Eng 132(1), 011102 (Dec 21, 2009) (6 pages) doi:10.1115/1.3160535 History: Received November 13, 2008; Revised February 09, 2009; Published December 21, 2009; Online December 21, 2009

This paper presents an innovative modeling technique that combines experimental force measurements from a full scale linear generator with a coupled model of a two body, moored floating system to investigate the performance of a wave energy conversion system. An experiment was conducted using the Oregon State University’s wave energy linear test bed to characterize the frictional and electromagnetic forces generated by the SeaBeavI linear generator. These force characteristics have been incorporated into a coupled model using a numerical fluid-structure interaction model, OrcaFlex, to predict the energy extraction potential of the system.

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Copyright © 2010 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

The active components of the permanent magnet linear generator mounted in the Oregon State University’s wave energy linear test bed

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Figure 3

Average measured force between the magnet section and the spar as a function of velocity

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Figure 4

Solution domain defined in StarCCM+ to estimate the shear stress in the gap between the buoy and the spar

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Figure 5

Shear stress on the oscillating wall as a function of the wave height

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Figure 6

Relationship between force and velocity: 0.8 m/s peak sinusoidal velocity and 14.13 Ω fixed resistance

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Figure 7

Linear generator damping coefficient as a function of the fixed resistance

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Figure 8

Geometry of the resized SeaBeavI

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Figure 9

Springs and dampers used to model the contact forces, friction, and generator force between the buoy and the spar

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Figure 10

Characteristic of the nonlinear damper used to model the friction between the buoy and the spar

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Figure 11

Relationship between generator damping and generator input power (wave height: 2 m; wave period: 8 s)

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Figure 12

Relationship between the wave period, wave height, and optimal damping for the regular wave load cases

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Figure 13

Average mechanical power produced in regular waves

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