부유식 진자형 파력발전 장치의 파랑 중 운동에 관한 비선형 시간영역 해석

Abstract

In this paper, nonlinear wave-induced motion response of floating pendulum wave energy converter is numerically investigated. Time-domain simulation is carried out by using convolution integral of retardation function. Nonlinear restoring and Froude-Krylov forces acting on instantaneous wetted body surface are considered. Hinged motion is approximately simulated by using strong connecting spring. In order to obtain hydrodynamic coefficients and wave exciting forces of floating bodies, higher-order boundary element method(HOBEM) using wave Green function is applied to present problems. Firstly, regular wave simulations of floater only with three different wave heights in head sea are carried out. Nonlinear motion behaviors are observed. Then, coupled analysis with floater and pendulum are also performed in same simulation conditions. Nonlinear pitch response with three wave heights are suggested.