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진재호(J. H. Jin),노승국(S. K. Ro),경진호(J. H. Kyung),박종권(J. K. Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A power amplifier for Magnetic bearing system based on network is proposed in this paper. A power amplifier is classified into the linear method of simple circuit and the switching method of low power consumption. A power amplifier proposed in this paper designs into hybrid form which is mixed both the linear method and the switching method. Also, in case of using several independent power amplifiers, it is necessary to transmit control input from main controller to power amplifier and to control power amplifier system. A DSP controller board(TMS320LF2406) is adopted to solve this problems. Namely, a controller area network is constructed to receive control input from main controller and a digital PD control algorithm is realized to control power amplifier system in the DSP controller board. Experiments are carried out to verify the effectiveness of the proposed power amplifier system based on network.
Micro/Meso부품 대응형 마이크로 기계가공시스템 기술 연구
박종권(J.K.Park),경진호(J.H.Kyung),노승국(S.K.Ro),김병섭(B.S.Kim),박중호(J.H.Park) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
This paper describes the design of micro machine tools system for mechanical machining of micro/meso scale mechanical parts. The micro machining systems such as μ-Late, μ-milling/drilling machine and μ-grinding machine are the basic elements constructing μ-factory which gains more attention recently because of increasing needs of mico and nano-parts in various industrial and medical area. A miniaturized 3-axis milling machine with VCM stage and air spindle and palm-top size micro-late are designed, and air bearing stage and stepwise linear motion system with PZT are studied for motion system. The micro cutting characteristics are investigated experimentally, and reconfigurable machine structures are also considered.
김정수(J.S.Kim),박성훈(S.H.Park),허신(S.Hur),경진호(J.H.Kyung),송달호(D.H.Song) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Results of the dynamic simulation on KTX catenary and catenary-pantograph interface are presented. Simulation programs based on finite element and finite difference models of the catenary are developed, while the pantograph is modeled as a linear 3-degree-of-freedom system. The catenary motion dynamics are primarily determined by the transmission and reflection of the propagating disturbance wave at the hanger and span boundaries. On the other hand, the catenary-pantograph contact characteristics are primarily influenced by the movement of the pantograph across the hanger and span boundaries, the amount of damping present in the contact wire, and the resonant frequencies of the pantograph.
박성훈(S.H. Park),김정수(J.S. Kim),허신(S. Hur),경진호(J.H. Kyung),송달호(D.H. Song) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Dynamic characteristics of pantograph-catenary system that supplies electrical power to high-speed trains are investigated. A simple catenary is composed of the contact and messenger wires connected by hamgers possessing bi-directional stiffness properties. The influences of parameters that determine the contact properties of pantograph - catenary system are investigated through numerical simulations. For the catenary, a finite difference model composed of 10 spans is constructed. The contact and messenger wires are modeled as strings with respective tension and damping ratio values. The pantograph is modeled as a linear 3-degree-of-freedom system. It is found that the tension, number of hangers and damping ratios as well as the speed of the train significantly influence the contact forces and contact separation rate.