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http://dx.doi.org/10.5574/KSOE.2013.27.1.085

Power Estimation and Optimum Design of a Buoy for the Resonant Type Wave Energy Converter Using Approximation Scheme  

Koh, Hyeok-Jun (Multidisciplinary Graduate School for Wind Energy, Jeju National University)
Ruy, Won-Sun (Ocean System Engineering, Jeju National University)
Cho, Il-Hyoung (Ocean System Engineering, Jeju National University)
Publication Information
Journal of Ocean Engineering and Technology / v.27, no.1, 2013 , pp. 85-92 More about this Journal
Abstract
This paper deals with the resonant type of a WEC (wave energy converter) and the determination method of its geometric parameters which were obtained to construct the robust and optimal structure, respectively. In detail, the optimization problem is formulated with the constraints composed of the response surfaces which stand for the resonance period(heave, pitch) and the meta center height of the buoy. Use of a signal-to-noise ratio calculated from normalized multi-objective results with the weight factor can help to select the robust design level. In order to get the sample data set, the motion responses of the power buoy were analyzed using the BEM (boundary element method)-based commercial code. Also, the optimization result is compared with a robust design for a feasibility study. Finally, the power efficiency of the WEC with the optimum design variables is estimated as the captured wave ratio resulting from absorbed power which mainly related to PTO (power take off) damping. It could be said that the resultant of the WEC design is the economical optimal design which satisfy the given constraints.
Keywords
Resonance; Wave energy converter; Power buoy; Boundary element method; Response surface; Power take off; Captured wave ratio;
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