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金良述,金相範 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-
Based on the mechanical and pumping losses measured in motoring test a new coefficient of pumping loss was asumed and the influence of speed and load wear considered. As a result, the theoretical equations for estimating the net power and specific fuel consumption could be established. It was proved that usual mechanical efficiency estimated based on the motoring test was inadequate. And it was pointed out that the estmate net power and specific fuel consumption wear in agreement with the experimental data in operation with the theoretical mixture.
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金良述,韓昇昶 홍익대학교 산업기술연구소 2002 産業技術 Vol.12 No.-
For understanding combustion phenomena in a D.I disel engine, a simulation analysis was mode by using the Star-CD program modified four disel engine. The calculation results were then compared with the experimental results. The effects of the injection nozzle specification, configuration of the combustion chamber and the air motion within the engine performance were investigated.
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수중방전에 의한 주물청정장치에서 압력분포의 2차원 해석
金良述 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-
Pressure distribution that is most important parameter in Casting Decoring and Cleaning Installation was analyzed into two dimension by using K-FIX computer program. Periodic influx and efflux are absent. Modelling was conducted by using R-Z coordinates. Marker particle was introduced to predict structure and size of main surface and those of partial surface. Initial condition and boundary condition was modified to correspond with internal structure. From numerical analysis, it was shown that maximum pressure was increased as a water level increased and pressure of casting which was set in radial direction was higher than that which was set in axial direction. On the other hand, it was proved that prediction of surface structure was possible by introducing Marker particle. To study more, it should be improved for code to include correct analysis of plasma and numerical analysis which can be applicable to actual size.
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金良述 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-
Heat transfer coefficients in a spark iginition engine under knock conditions were determined by estimation from surface temperature and heat-flux measured, and gas temperature which was calculated by a two-zone model in combustion chamber. For the knock intensity less than 0.3MPa the maxima of the heat-flux and the heat transfer coefficient at the knock zone are slightly affected by the knock intensity, while, if the knock intensity exceeds 0.3MPa, they increase with the knock intensity. For the knock intensity of 0.6㎫, they at the knock zone are about 2-2.6 times higher than under the non-knock condition.
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金良述 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-
A simulation of contaminant dispersion in a water reservoir has been done using 2-D finite difference method(FDM). The steady state velocity field of the reservoir was computed using stream function-vorticity formulation of Navier-Stokes equation and continuity equation. Based on the computed steady state velocity field. the transient convective diffusion equation of the contaminant dispersion was computed. For the 1m×1m reservoir model with inlet and outlet attached. it was shown that the center of circulation located toward right. For the numerical values of ν=0.01(㎠/s) and D=0.6(㎠/s) and the flow of 50(㎤/s) it was determined that the outflow had to be shut down in 18 seconds to prevent from severe pollution Also the required time was computed to be 6 seconds for the inflow of 100(㎤/s). The result of this study is considered. hopefully to be useful for the design of the water reservoir systems that are the subjects to various contamination.
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金良述,安秀哲 弘益大學校 産業技術硏究所 2007 産業技術 Vol.17 No.-
In automotive disc brake system, friction heat is not uniformly distributed due to various reasons such as thermal expansion and imperfections in geometry. It is well known that thermoelastic distortion due to frictional heating affects the contact pressure distribution and can lead to thermoelastic instability, where the contact load is concentrated in one or more small regions on the brake disc surface. These regions then take very high temperatures and passage of hot spots moving under the brake pads can cause low frequency vibration called brake judder. This paper presents the FEM (finite element method) result for the temperature distribution of ventilated disc brake. A steady state two-dimensional model of disc brake system predicts the surface temperatures during a multi-stop driving schedule.
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레이져 빔을 利用한 연삭표면의 거칠기 測定에 關한 硏究
金良述,金南洙,李宙相 홍익대학교 산업기술연구소 1994 産業技術 Vol.3 No.-
The purpose of this paper is to estimate noncontact method using optical unit for surface roughneess measurement.The measurement system is extremly simple and the apparatus propesed is composed by the use a laser unit, photodiode array and tracing system.This method is measurement of grinding surface roughness by tracing speed (1.5㎜/s, 3㎜/s) and laser beam spot diameter(0.1㎜).
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金良述,韓昇昶 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-
Numerical analysis of the dynamic contact and the stress developing in the high-speed driven valve of an internal combustion engine is presented. The valve is modeled by finite element techniques, and the dynamic contact between the valve and the valve seat is analyzed by the solution strategies of differential algebraic equations. Also an iterative scheme similar to the augmented Lagrange multiplier method is employed to enforce the contact constraints. It is shown that the contact and separation between the valve and the valve seat can be computed by the finite element techniques without assuming the artificial springs, and the efficiency and accuracy of the solution are demonstrated by the numerical examples.
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전기점화기관에서 노크발생시 열유속과 노크강성에 관한연구
金良述 홍익대학교 산업기술연구소 1999 産業技術 Vol.9 No.-
A relation between knock intensity and local wall heat flux in a spark ignition engine is investigated by measuring time variation of cylinder pressures, surface temperatures and wall heat fluxes. Near a knock zone, the surface temperature and the wall heat flux rise rapidly when the knock is initiated. For the knock intensity less than 0.3 MPa, the maximum and the time averaged values of the heat flux are not affected by it, while if it exceeds 0.3 MPa these values increase slightly with it. These increase in the heat flux cause an increase in a heat loss to reduce a power and an exhaust temperature.
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