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박인준(I.J.Park),곽경남(K.N.Kwak),백형래(H.L.Beak) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
This paper is a study about motor technic of motion and feedforward control in order to shape cutting control on the machine tool. The shape error caused by delay of the servo system in the direction of radius at the time of circular cutting is reduced by feedforward control, shape error generated by the position command delay is minimized by using the acceleration/deceleration time constant after the interpolation. The study was verified to optimization of motion control on experiments of a vertical machining center of the machine tool.
CNC 공작기계의 AC 서보 모터의 위치 및 속도 제어 특성
박인준(I. J. Park),백형래(H. L. Baek),정헌상(H. S. Jung),정수복(S. B. Jung),최송철(S. C. Choi) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper is a study about Ac servo motor position and speed control characteristics which depend on feedforward control, the acceleration / deceleration time constant after the interpolation, and PI control, automatic deceleration at comer in order to shape cutting control of feed drive system of the machine tool The shape error caused by delay of the servo system in the direction of radius at the time of circular cutting is reduced by feedforward control. The shape error generated by the position command delay is minimized by using the acceleration / deceleration time constant after the interpolation. The results were verified to optimization of feed drive system by a vertical machining center experimentation of the machine tool.<br/> <br/>
A numerical study on the effect of train-induced vibration in shield tunnel
곽창원,박인준,박준범,Kwak, C.W.,Park, I.J.,Park, J.B. Korean Tunnelling and Underground Space Associatio 2014 한국터널지하공간학회논문집 Vol.16 No.2
다양한 종류와 크기의 하중이 터널에 재하되는데, 본 연구에서는 쉴드 터널 내부에 작용하는 열차 진동하중이 연약 사질지반에 미치는 영향을 3차원 수치모델에 의하여 수치해석적으로 검토하였다. 이를 위하여 사인함수와 열차제원을 이용하여 열차진동의 형상과 주파수를 산정하고 속도충격률 및 노반압력을 계산하여 열차진동하중을 획득하였다. 계산된 열차진동하중을 3차원 유한차분해석망에 재하하여 Finn model을 이용한 유효응력해석을 수행하였다. 그 결과, 시간에 따른 과잉간극수압이력을 산정하였고 과잉간극수압비를 이용하여 액상화 가능성을 판정하였다. 그 결과 열차진동하중에 의하여 과잉간극수압이 발생함을 확인하였으나, 발생 정도는 미미함을 확인하였다. Various types of external loads can be applied to the tunnel structure. In a shield tunnel, the vibration from the train may affect the behavior of the adjacent ground. In this study, the railway-induced vibration was estimated and applied to the shield tunnel through 3D numerical simulation. The effective stress analysis based on the finite difference method and Finn model was performed to investigate the potential of liquefaction below the tunnel. Furthermore, pore water pressure and displacement were monitored on a time domain; consequently, the liquefaction potential and dynamic response of the shield tunnel were analyzed. Consequently, it is confirmed that the generation of excess pore water pressure by train-induced vibrating load, however, the amount does not meaningfully affect the potential of liquefaction.
김평호(P. H. Kim),박인준(I. J. Park),정병호(B. H. Chung),오금곤(G. K. Oh),백형래(H. L. Baek) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper describes the controller for the improving speed control the AC servo motor. The microprocessor provides an output to the difference in command. The servo system improves the characteristics of speed control. When the motor is running at the same speed as set by the reference signal, the speed encoder also provides a signal of the same frequency. Thus, the microprocessor controlled digital techniques enable to realize the flexible performance and control which was possible with time constant. We can know that optimal speed of machining center is 75msec in 30000mm/min and actually, 75msec is using on machining center. Finally experimental results prove excellent performance of this control system. This can be reduced error with more exact measure of actual speed. The system can be adaptable to CNC machine.<br/>
박인준,백형래 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2
This paper is a study about motor technic of feed drive system control and Feedforward control in order to shape cutting control on the machine tool. The shape error caused by delay of the servo system in the direction of radius at the time of circular cutting is reduced by Feedforward control, shape error generated by the position command delay is minimized by using the acceleration/deceleration time constant after the interpolation. The study was verified to optimization of feed drive system control on experiments of a vertical machining center of the machine tool.
김평호,박인준,백형래 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.2
This paper describes the controller for the improving speed control of the AC servo motor. The microprocessor provides an output to the difference in command. The servo system improves the characteristics of speed control. When the motor is running at the same sped as set by the reference signal, the speed encoder also provides a signal of the same frequency. Thus, the microprocessor controlled digital techniques enable to realize the flexible performance and control which was possible with time constant. The results shows that the optimal speed of machining center is 75msec in 30000㎜/min and actually, 75msec is using on machining center. Finally experimental results prove excellent performance of this control system. This can be reduced error with more exact measure of actual speed. The system can be adaptable to CNC machine.
이종대,최창균,김래현,박인준 한국화학공학회 1988 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.26 No.5
수평으로 위치한 평면전극 사이에 CuSO₄,-H₂SO₄-H₂O의 용액이 있을 때 발생되는 자연대류의 시작에 대하여 고찰하였다. 자연대류의 발생시점은 실험적으로 확산이동시 흐르는 전류량과 자연대류시 전류량을 직접 비교함으로서 얻었다. Nernst 확산층 두께를 기준으로 한 임계 Rayleigh수는 1250±100이었다. 본 연구에서 자연대류 발생을 감지한 임계시간은 "전파이론"에 의하여 제시된 임계시간보다 4배 정도 큰 것으로 나타났다. The onset of natural convection has been investigated in a CuSO₄-H₂,SO₄-H₂O solution placed between parallel and horizontal plane electrodes. The onset time was obtained experimentally by directly comparing the current of diffusion control with that of natural convection control. The critical Rayleigh number based on the Nernst diffusion layer thickness was found to be 1250±100. This critical time marking the detection of convection was four times larger than that predicted by the propagation theory.