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손상된 선박의 구난 기술 및 안전 예항에 관한 연구(4)
손경호(K.H. Sohn),이상갑(S.G. Lee),최경식(K.S. Choi),김용기(Y.K. Kim) 한국항해항만학회 1998 한국항해항만학회 학술대회논문집 Vol.2 No.2
This paper presents a brief outline of dynamic stability of damaged ship in rough, beam wind and waves. The one degree-of-freedom, linear roll equation is adopted with the effects of damage fluid and external forces, but without the effect of sloshing. We evaluate the dynamic stability in terms of capsizing probability based on energy balance mechanics and risk analysis, the method of which was proposed by Umeda [2] to the high speed crafts. As a result, we can predict the dynamic stability quantitatively according to sea state, operating and damage conditions.
도시철도직류변전소의 회생전력 흡수를 위한 회생인버터 시뮬레이션
배창한(Bae C. H),한문섭(Han M. S),김용기(Kim Y. G),권삼영(Kwon S. Y),박현준(Park H. J) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
In DC traction substation with 12-pulse diode rectifiers, the DC line voltage tends to rise above noload voltage because it can"t absorb the regenerative power caused by electric brakes of train. To solve this problem, an IGBT regenerative inverter should be installed and recycles the surplus regenerative power by delivering it to the supply grid. In this paper, the DC traction substation equipped with a IGBT regenerative inverter is studied using computer simulation. Matlab/simulink is used to simulate the operation of regenerative inverter which injects the regenerative power into the supply grid and stabilizes the DC line voltage. It is confirmed that the high quality regenerative power is delivered to the supply grid thorough computer simulation.
풍압력하에서 피예항중인 손상선박의 침로안정성에 관한 연구
손경호,김용기,이상갑,최경식 한국해양대학교 해양과학기술연구소 2000 硏究論文集 Vol.9 No.1
본 논문은 손상선박의 안전대책에 관한 연구의 일환으로, 황천항행중인 선박이 충돌, 좌초 등 원인에 의해 손상을 받았을 때를 가상하고, 손상선박을 다른 안전한 장소로 예항하고자 할 때의 침로안정성 문제를 다루고 있다. 외력으로는 바람의 영향만을 고려할 때 예선·피예선계의 침로안정성 평가를 위한 특성방정식을 도술하고, 피예선의 각 손상상태에 따른 침로안정성을 수치계산하였다. 그 결과 손상상태, 풍속, 풍향 및 예항삭의 길이 등이 침로안정성에 미치는 영향을 평가할 수 있었다. This paper is related with one of safety plans to rescue a damaged-ship whether by collision, grounding or internal accident. We discuss the problem on course stability of damaged-ship while towed under severe wind pressure. The characteristic equation to assess the stability on course, is derived from sway and yaw coupled motion of towing and towed vessels with wind effect. Through the numerical calculation on course stability of towing and towed vessels system, the relationship between the course stability of a towed damaged-ship and wind direction or towrope length, is clarified with the parameters of weather and damage conditions.