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박수강(S.K Park),성경민(K.M Sung),조금배(G.B Cho),오금존(G.G Oh),백형래(H.L Beak),박해암(H.A Park) 전력전자학회 1996 전력전자학술대회 논문집 Vol.1996 No.-
The most common for starting a single phase induction motor is to install a starting condenser and a centrifugal switch in series with the auxiliary winding. Though this method is simple, life of single phase induction motor is short because of malfunction of a starting condenser and a centrifugal switch and efficiency improvement has limitation. In this paper, the starting characteristics of SPIM is improved by sequence voltage control strategy of auxiliary winding in removing a starting condenser and a centrifugal switch. Finally, the excellent starting performance of SPIM is shown through simulation and experimental results.
박수일(S.I. Park),박원규(W.G. Park),정철민(C.M. Jung) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
A massive cavity is generated behind the underwater vehicles, such as marine propellers, pump impellers, nozzles, injectors, torpedoes, etc. when a underwater vehicle moves at very high speed in the underwater. At this point it makes supercavitating flow and the nose, ie., the cavitator is very important fator at the vehicle since it should be surrounded by the cavity. The present work has focused on the simulation of cavitation flow using the new cavitator. The governing equation is the Navier-Stokes equation based on homogeneous mixture model. For the code validation, the results from the present solver have been compared with experiments and other numerical results. A fairly good agreement with the experimental data and other numerical results have been obtained.
박수종(S J Park),정한진(H J Jung),장민영(M Y Jang),정태화(T H Jung),권영안(Y A Kwon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
Speed and torque controls of permanent magnet synchronous motors are usually attained by the application of position and speed sensors. However, speed and position sensors require the additional mounting space, reduce the reliability in harsh environments and increase the cost of a motor. Therefore, many studies have been performed for the elimination of speed and position sensors. This paper investigates a novel sensorless control of a permanent magnet synchronous motor. The proposed control strategy utilizes the active and reactive torque control for maximizing the active torque of a sensorless PMSM. The proposed algorithm is verified through the simulation and experimentation.
유한요소 해석에 의한 소성가공 공정의 임계 연성파단 값의 결정
박수형(S. H. Park),이상곤(S. K. Lee),김병민(B. M. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
The occurrence of ductile fracture is the working limit of many metal forming processes. It is necessary to predict the criteria and to apply the condition in a process design. Over the years, the way for clarifying conditions have been studied and presented. However such a way needs lots of experiments and analysis. In this study, in order to determine the critical damage value of a used material Cu 4N, it was performed a tensile test and FEM analysis by using DEFORM 2D. For applying the obtained critical damage value it was also performed a upsetting test by using DEFORM 2D. The way of determining a critical damage value which is presented in this study will make possible to find easily it which is one of the working limit factor.
초음속 고받음각에서의 원뿔형 물체 주위의 비대칭 와류 특성 연구
박미영(M.Y. Park),노경호(K.H. Noh),박수형(S.H. Park),이재우(J.W. Lee),변영환(Y.H. Byun) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.2
A supersonic viscous flow over a five-degree half-angle cone is studied computationally with three-dimensional Navier-Stokes equations. Steady asymmetric solutions show that the asymmetric flow separation is caused by convective instability. The effects of angle of attacks, Reynolds numbers, and Mach numbers have been investigated and it is found that those factors affect the generation of the side force. The side force has the maximum value at a=22°, while over a=22°, asymmetric vortex becomes transient, which results in the unsteady shedding. At the angle of attack of 22 degrees, the side force increases with Reynolds number and decreases with Mach number. The increase of the side force stops over the critical Reynolds number for the present configuration.
이세민(S.M. Lee),사정환(J.H. Sa),전상언(S.E. Jeon),김창주(C.J. Kim),박수형(S.H. Park),정기훈(K.H. Chung) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
Aerodynamic design optimization of rotor airfoil has been performed with advanced design method for improved aerodynamic characteristics of ONERA airfoils as a baseline. A multiple response surface method is used to consider various constraints in rotor airfoil design. Airfoil surface and mean camber line are modified using various shape functions. Numerical simulations are performed using KFLOW, a Navier-Stokes solver with shear stress transport turbulence model. The present design method provides favorable configurations for the high performance rotor airfoil. Resulting optimized airfoils give better aerodynamic performance than the baseline airfoils.
전상언(S.E. Jeon),손미소(M.S Son),박수형(S.H. Park),김창주(C.J. Kim),강희정(H.J. Kang),김승범(S.B. Kim),김승호(S.H. Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
A Reynolds-Averaged Navier-Stokes code is simultaneously coupled with the transition transport model of Langtry and Menter and applied to the numerical prediction of aerodynamic performance of the designed airfoils. Numerical prediction results for KU112F and KU109C airfoils are validated by experimental data obtained from a transonic wind tunnel. Drag coefficients from the experiment are better correlated to the numerical prediction results using a transition transport model rather than the fully turbulent simulation results. Maximum lift coefficient and drag divergence at the zero-lift condition with Mach number are investigated to evaluate the aerodynamic performance of the designed airfoils. Numerical and experimental data show that both airfoils achieve better performance than the baseline airfoils.