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A Simplified Phenomenological Theory of Viscosity for Liquid Metals
김원수,채동식,Kim, Won Su,Chae, Dong Sik Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.1
This study simplifies the phenomenological theory of viscosity previously proposed by the present authors. This simplified theory has only two thermodynamic properties and one parameter, as opposed to its predecessor, which has many, allowing for easy calculation of the liquid viscosities. The viscosity of liquid metals, an excellent test for checking the validity of the liquid theory, can be calculated using the equation based on the simplified theory. The calculated results by the current theory turn out to be good for the liquid metals, including sodium, potassium, rubbidium, cesium, lead and mercury.
사판식 액셜피스톤 펌프-레귤레이터계의 선형화해석에 의한 유압제어특성 고찰
조승호,김원수,Jo, Seung-Ho,Kim, Won-Su 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.10
The regulator system has been modeled and combined to a swashplate type axial piston pump. Linear approximation has been performed for nonlinear coefficient terms of an axial piston pump-regulator model without significantly affecting accuracy. Based on the mathematical model of an axial piston pump-regulator system, a couple of characteristic curves of negative flow control and horsepower control are drawn, which show a good correlation with those of experimental results. So the simplified axial piston pump-regulator model in this paper is expected to be utilized not only for the design and analysis of hydraulic circuit of excavator but also for prevention of engine overload.