Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Numerical Study on Shape Optimization of a Heaving Hemisphere Wave Energy Converter

상하 운동 반구형 파력 발전기의 최적 형상 조건 수치해석

  • Kim, Sung-Jae (School of Naval Architecture & Ocean Engineering, University of Ulsan) ;
  • Koo, Weoncheol (Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Heo, Kyung-Uk (Geoje Shipyard, Samsung Heavy Industries) ;
  • Heo, Sanghwan (Department of Naval Architecture & Ocean Engineering, Inha University)
  • 김성재 (울산대학교 조선해양공학부) ;
  • 구원철 (인하대학교 조선해양공학과) ;
  • 허경욱 (삼성중공업 거제조선소) ;
  • 허상환 (인하대학교 조선해양공학과)
  • Received : 2015.06.26
  • Accepted : 2015.08.20
  • Published : 2015.11.25
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Abstract

Parametric study on submerged body shape of an oscillating hemisphere point absorber was conducted to predict the optimal relation between radius and draft of the body. As an additional damping due to power takeoff system, the optimal damping same as wave radiation damping was applied to the PTO system to produce the maximum wave power. Body response spectrum and power spectrum were obtained for various peak frequencies on wave spectra. It was found that the maximum power can be generated when the peak frequency of available wave power was 20% greater than that of wave spectrum.

가동 물체형 점흡수식 반구형 파력발전장치의 수면하 형상에 대한 매개변수 연구를 수행하였다. 매개변수로는 반구의 반지름과 흘수를 사용하였고, 각 조건에 따른 반구의 상하운동응답을 분석하여 최적의 반지름과 흘수사이의 관계를 추정하였다. 또한 최대 파력 에너지를 추출하기 위해 PTO 시스템으로 인한 추가 감쇠 계수를 부유체의 방사 감쇠 계수와 동일하게 지정하였다. 부유체의 운동응답 스펙트럼과 추출 파워 스펙트럼을 입사파 스펙트럼 첨두 주파수의 변화에 따라 구하였다. 이를 통해, 가용 파 에너지 추출량의 첨두 주파수가 입사파 스펙트럼의 첨두 주파수보다 약 20% 클 때, 최대 파워 실효치를 갖는 것을 알 수 있었다.

Keywords

References

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