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부유식 풍력-파력발전 플랫폼과 탑재된 파력발전기와의 단방향 연성 운동 해석
이혜빈(Hyebin Lee),배윤혁(Yoon Hyeok Bae),조일형(Il-Hyoung Cho) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.2
In this study, a six degree-of-freedom motion analysis of a wind-wave hybrid platform equipped with numerous wave energy converters (WECs) was carried out. To examine the effect of the WECs on the platform, an analysis of one-way coupling was carried out, which only considered the power take-off (PTO) damping of the static WECs on the platform. The equation of motion of a floating platform with mooring lines in the time domain was established, and the responses of the one-way coupled platform were then compared with the case of a platform without any coupling effects from the WECs. The hydrodynamic coefficients and wave exciting forces were obtained from the 3D diffraction/radiation pre-processor code WAMIT based on the boundary element method. Then, an analysis of the dynamic responses of the floating platform with or without the WEC effect in the time domain was carried out. All of the dynamics of a floating platform with multiple wind turbines were obtained by coupling FAST and CHARM3D in the time domain, which was further extended to include additional coupled dynamics for multiple turbines. The analysis showed that the PTO damping effect on platform motions was negligible, but coupled effects between multiple WECs and the platform may differentiate the heave, roll, and pitch platform motions from the one without any effects induced by WECs.
수치 실험을 통한 조선 강판 전용 Nesting Algorithm의 적합도 함수의 결정
이혜빈(Hyebin Lee),유원선(WonSun Ruy) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.5
In this paper, a research on the composition of the nesting algorithm fitness is carried out by performing various numerical experiments to inspect how it affects the scrap efficiency, allocation characteristics and time consumption, targeting the nesting results of ship parts. This paper specifically concentrates on a method to minimize the scrap ratio and efficiently use the well-defined remnants of a raw plate after the nesting process for the remnant nesting. Therefore, experiments for various ship parts are carried out with the weighting factor method, one of the multi-objective optimum design methods. Using various weighting factor sets, the nesting results are evaluated in accordance with the above purposes and compared with each set for each ship part groups. Consequently, it is suggested that the nesting algorithm fitness function should be constructed differently depending on the characteristics of the parts and the needs of the users.