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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.
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.
허신(S. Hur),경진호(J.H.Kyung),H.S.Han,송달호(D.H.Song),박성훈(S.H.Park),김정수(J.S.Kim) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, we developed the simulation program of an overhead catenary-pantograph system. The overhead catenary is modeled with point mass and the pantograph is replaced wi th 3 d.o.f model which is composed of mass, spring and damper. Using the developed program, we analyzed the static structure of the overhead catenary and the dynamic characteristics of an overhead catenary-pantograph system such as uplift displacement of contact wire and contact force. we compared the analysis resul ts wi th the results of GASENDO software developed at RTRI in Japan. The behaviors of uplift displacement of contact wire and contact force were similar with the results of GASENDO software.