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변정환(Jung Hwan BYUN),최명수(Myung Soo CHOI),여동준(Dong Jun YEO),양정규(Jung Kyu YANG),서정주(Jung Joo SUH) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.14 No.1
A delivery ship is used to handle the cargo with the crane to/from the ships. The ship is inclined in the direction of a cargo which is hung on a crane. In this case, a arc shaped rail should be in the equilibrium state to get good anti-rolling performance. In this study, a device and control algorithm are developed to take accurate and quick equilibrium of the rail. The device is composed of a hinged immovable support and two screw jacks. And the control algorithm demands two controllers. One controller is designed such that the screw jack 1 and 2 follow the position reference signal generated by a tilt sensor. The other controller of is designed to remove the synchronous error occurred between jack 1 and jack 2. The simulation results show that the desirable control performance is achieved.
여동준(Dong Jun YEO),최명수(Myung Soo CHOI),변정환(Jung Hoan BYUN),서정주(Jung Joo SUH),양정규(Jung Kyu YANG) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.14 No.2
This paper deals with the free vibrations of truncated conical shell with elastic supports by the transfer matrix method. The classical thin shell theory based upon the Flügge theory is assumed and the governing equations of a conical shell are written as a coupled set of first order differential equations using the transfer matrix. The Runge-Kutta-Gill integration method are used to solve the governing differential equations. The natural frequencies and corresponding mode shapes are calculated numerically for the truncated conical shell with elastic supports and various boundary conditions at the edges. And all boundary conditions and elastic supports between conical shell and foundation could be treated only by adequately varying the values of the spring constants. Numerical results show that the transfer matrix method can accurately obtain natural vibration characteristics of the conical shells with elastic supports.
여동준(Dong Jun YEO),최명수(Myung Soo CHOI),변정환(Jung Hwan BYUN),서정주(Jung Joo SUH),양정규(Jung Kyu YANG) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.1
This paper deals with the free vibrations of folded plates by the transfer influence coefficient method. The governing equations of a non-circular cylindrical shell including a plate as special case are written in a coupled set of first order matrix differential equations. The Runge-Kutta-Gill integration method is used to solve the governing differential equations. The natural frequencies and corresponding mode shapes are calculated numerically for the folded plate of various crank angles. All boundary conditions and the intermediate supports between folded plate and foundation could be treated only by adequately varying the values of the spring constants.
여동준(Dong Jun YEO),최명수(Myung Soo CHOI),변정환(Jung Hwan BYUN),서정주(Jung Joo SUH),양정규(Jung Kyu YANG) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2
In this paper, the authors formulated analytical algorithm for the in-plane free vibration of a annular plate with intermediate support part by the transfer influence coefficient method (TICM) which is based on the successive transmission of influence coefficients on nodal circumferences. To confirm the effectiveness of the suggested algorithm, we analyzed the free vibration of a annular plate with three typical intermediate support parts by the TICM and the Transfer matrix method (TMM) on a personal computer. The computational result was that the TICM was superior to the TMM in the in-plane free vibration analysis of a annular plate with rigid intermediate supports.
직접분사식 디젤기관에서 메탄올 혼합연료의 배기 배출물에 관한 연구
서정주,왕우경,김상암 여수대학교 2001 論文集 Vol.16 No.-
In this study, the fuel injection system of a DI diesel engine was modified slightly with installing two agitators and a F.O supply pump to use the methanol-blended fuel. The emission concentrations were compared with the case of diesel oil and the methanol-blended fuel in a DI diesel engine. The results are as follows : The concentrations of NOx and HC in exhaust emissions were lower than those of diesel oil as blending ratio of methanol increased, but the concentration of CO was higher slightly. As it was used the methanol-blended fuel of 10%∼20%, the exhaust emissions of NOx and HC were improved no significant difference of the engine performance in comparison with diesel oil. As the load was increased, the concentration of CO2 in exhaust emissions was high and that of O2 was low, and concentration of those in exhaust emissions was no significant difference among the fuels at constant loads.