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열차동역학에서 주어진 정적평형상태의 초기하중을 계산하기 위한 최적화 알고리즘
김종인(Kim J. I.),박정훈(Park J. H.),유홍희(Yoo H. H.),황요하(Hwang Y.) 한국철도학회 1999 철도저널 Vol.2 No.3
This paper presents a new algorithm to determine the pre-loads that sustain the static equilibrium state in a given position. The algorithm which uses a partial velocity matrix leads to an unconstrained optimization problem to compute the pre-loads of the suspensions. To demonstrate the validity of the proposed algorithm, the static analysis results that employ the pre-loads of three examples are presented using a reliable commercial program. Results of the analysis confirm the validity of the proposed algorithm.
김민환(M. H. Kim),이재선(J. S. Lee),박진석(J. S. Park),김종인(J. I. Kim),김긍구(K. K. Kim) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.3
CFD analyses of the three-dimensional turbulent flow in the impeller and diffuser of an axial flow pump including suction and discharge parts are presented and compared with experimental data. The purpose of the current study is to validate the CFD method for the performance analysis of the main coolant pump for SMART and to investigate the effect of suction and discharge shapes on the pump performance. To generate a performance curve, not only the design point but also the off-design points were computed. The results were compared with available experimental data in terms of head generated. At the design point, the analysis accurately predicts the experimental head value. In the range of the higher flow rates, the results are also in very good agreement with the experimental data, in magnitude but also in terms of slope of variation. For lower flow rates, the results shows that the analysis considering the suction and discharge well describe the typical S-shape performance curve of the axial pump.
김민환(M. H. Kim),김종인(J. I. Kim),박진석(J. S. Park) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.1
The CFD analysis of the three-dimensional turbulent flow in the impeller and diffuser of an axial flow pump was performed, Not only the design point but also the off-design points were computed. The results were compared with available experimental data in terms of head generated. At the design point, the analysis accurately predicted the experimental head value. In the range of the higher flow rates, the results were also in very good agreement with the experimental data, not only in absolute value but also in term of slope. Although experimental data to be compared were not available in the range of the lower How rates, the results well described the S-shape performance curve of the axial pump characteristic.