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장성영(S.Y.JANG),박정태(J.T.PARK),이갑재(K.J.LEE),이광주(K.J.LEE),김종규(J.G.KIM),조성준(S.J.CHO) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper introduces the ship propulsion system in different aspects. In fact there are many types to accomplish electric propulsion. The latest installations are based on fixed generator speed and motor speed control. The AC motor drive systems with synchroconverter, cycloconverter, PWM converter are chosen for the ship electric propulsion. The configurations of the ship electric propulsion system must be considered about following criteria: torque and speed performances, redundancy, cost, harmonics, available space and shape. This paper introduces possible configurations of the ship electric propulsion and the major and minor points.
우상원(S.W. Woo),유영은(Y.E. Yoo),최두선(D.S. Choi),윤재성,김선경(S.K. Kim),조성준(S.J. Cho) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Vaporized moisture in the thermoplastic resin has caused surface defects such as silver streak. Pre-drying process to eliminate the moisture from the resin is a typical way to reduce the surface defects from the moisture, but it results in great increase of energy consumptions. As an alternative way for this drying process, pre-pressurized cavity of injection molding tool was proposed and proved to reduce the surface defects without pre-drying process for resin. The effect of this new process depends on the pressure of the pre-pressurized cavity by inert gas like air or nitrogen gas, because the vaporization of the moisture in the resin is determined by the temperature and the pressure of the environment. In this paper, the pressure of the cavity is measured during the injection molding process for different pressurized gas being delivered to the cavity. Due to the cavity volume and leakage from the injection molding tool, the pressure of the cavity varies for quite long time considering the very quick filling process of the injection molding and also is limited to maximum pressure quite lower than pre-set value. The data from a series of experiment has been applied to designing the injection mold tool structure and cavity pressurizing system.