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WAVESTAR형 파력발전장치의 유압식 2차변환장치의 물리모델 구축에 관한 연구
이정희,오재원,하윤진,박지용,천호정,김경환,Lee, Jung-Hee,Oh, Jaewon,Ha, Yoon-Jin,Park, Ji-Yong,Cheon, Ho-Jeong,Kim, Kyong-Hwan 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.6
This study was conducted to develop an efficiency prediction program of a hydraulic secondary energy converter for calculating annual power generation of a Wavestar type wave power generator. Using the period and wave height obtained from the frequency domain analysis, the behavior of the floating body was obtained by assuming the sin function. The piston displacement and speed of the hydraulic cylinder were calculated considering the behavior of the floating body and the shape of the mechanism. The numerical simulation of the hydraulic system was performed by physically modeling the hydraulic cylinders, check valves, hydraulic motors, which are the main devices. In the future, this analysis program will be used to develop a program for estimating annual power generation of a moveable body type wave power generation device.
보라매 전투기 전자광학타겟팅 장비 탑재형태의 분석 평가
강치행(Chi-Hang Kang),오승현(Seung-Hyun Oh),강희창(Hee-Chang Kang),천호정(Ho-Jeong Cheon),이범석(Beom-seok Lee) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.10
본 논문에서는 탐색개발중인 전투기에 탑재할 EOTS의 운용유지·소요기술·개발비용에 대한 기술적 특성을 평가 분석하여 탑재방식을 연구하였다. 15개 항의 운용성 측면의 평가 결과, 내장형은 스텔스 기능의 장점이 있으며, 외장형은 장·탈착성, 접근성, 현 운용항공기와의 호환 활용성 및 무장 교체 가능성 등의 장점이 있다고 평가되었다. 17개 항의 기술 및 개발 비용 평가 결과, 소형·경량화 및 소모 전력에서는 내장형 탑재 방식이 유리하지만, 국내 기술의 적용에 의한 비용 절감과 성능 달성을 위한 기술 안정성 측면에서는 외장형 탑재방식이 우수하다고 평가되었다. In this paper, the loading methods of EOTS for an exploratory developing fighter were analysed by the technical characteristics of it’s operation, maintenance, engineering technology and development cost. By the analysis of operational ability evaluation, the internal type had the merits of stealth function, but the external loading type was preferable to certificate the accessibility, install/detach, compatibility and interoperability with the existing fighter aircraft. From the results of 17 items of technology and development cost evaluation, we found out that the internal type had the advantage of small sizing lightweight, but the external type was highly estimated in the field of application of domestic technology, cost reduction and technical stability for achievement of performance.