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스트레인 게이지를 이용한 추진축계 베어링 반력 측정에 관한 연구
김철우(C. W. Kim),이용진(Y. J. Lee),김의간(U. K. Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
본 논문은 기존의 잭업에 의해 이루어졌던 추진축계 베어링 반력의 측정을 스트레인 게이지를 이용하여 잭업으로는 측정이 불가능 했던 후부 선미관 베어링의 반력을 해석하였다. 또한 선체의 조건 변화에 따른 베어링 반력 변화를 측정 및 계산하여 차후 동 선종의 선체 조건 변화에 따른 베어링 반력을 예측 할 수 있는 자료로 활용될 수 있다.
Z축 운전구조를 갖는 선형 영구자석형 동기 전동기 운전제어에 관한 연구
이진하(C.H. Lee),최철(C.Chou),박한용(H.W. Park),김철우(C.U. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In this study a control system with variable gain schedule using real speed and moving direction is proposed to control a Permanent Magnet Linear Synchronous Motor (PMLSM) with Z-axis operation structure. <br/> The implementation of the controller is designed on the DSP TMS32OC32 board PMLSM is operated by using 4-point absolute positions profile with each velocity, acceleration and deceleration. The direction of the initial angle action for starting is set from the lower limit point to the upper limit point on PMLSM operation stroke The effectiveness of a control system with variable gam schedule is demonstrated by some experimental results<br/>
김원호(W. H. Kim),강유리(Y.L. Kang),김성준(S. J. Kim),이광학(K. H. Lee),김철우(C. U. Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
With the increasing demands for clean environment, development of air cleaning systems has been received increasing attention.<br/> Pulse power systems are widely used for air cleaning in the industrial applications. high voltage pulse power supply affects the performance of the overall environmental system<br/> In this study, high voltage micro pulse power supply for removing NOx in diesel engines is developed.<br/> The ratings of the pulse voltage is 20kV. The pulse width is 10usec and max. pulse repetition ratio is 1kHz.
김태진(T.J.Kim),변영복(Y.B.Byun),조기연(K.J.Joe),조상명(S.M.Cho),김철우(C.U.Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Joining thin aluminum alloy is difficult using most welding techniques Many of problems associated burn-through by the high heat input Common welding techniques are TIG, MIG, and MIG-PULSE welding The VP-GMA W provides more control of the heat balance m the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities.<br/> In this paper, we proposed new VP GMA Welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, penentraion by this method are presented
태양광 저에너지 출력을 위한 Buck, Boost 컨버터 구동방식
김병우(B.W. Kim),박성준(S.J. Park),김광헌(K.H. Kim),손무헌(S.M. Heon),조수억(S.E. Cho),김철우(C.U Kim) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
Normally, the buck converter is used for the charging converter of photovoltaic generator because this converter has good characteristics compare with boost and buck-booster converter. But, in case of the sollar-cell voltage is lower than charging voltage, we cannot charge the sollar energy to the charger. So, in this paper, we proposed the novel hybrid converter using by combination of buck and boost converter for the charging converter of photovoltaic generator, as a results, it can operate buck, boost and buck-boost mode. The proposed novel converter has the same characteristics of the existent buck converter and furthermore it can operate as a boost converter. So, we can make the more effective photovoltaic charging system.