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양원진(Yang Won-Jin),박찬배(Park Chan-Bae),이형우(Lee Hyung-Woo),권삼영(Kwon Sam-Young),박현준(Park Hyun-June),원충연(Won Chung-Yeun) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
A linear induction motor for urban railway transit is accompanied with the end-effect and large air-gap comparing with a rotary induction motor. These cause amount of difference between simulation results and experiments. In order to figure out the difference, experiments based on a real-scale test bed are indispensable, however building a test-line and a test vehicle is so difficult that authors are going to make a small-scale model and simulate it for comparison. In this paper, A rotary-type small-scale model of a linear induction motor is designed. Thrust and normal force of the model have been analyzed with the variation of frequency and speed by using a Finite Element Method(FEM).
철도차량용 LIM의 공극변화에 따른 추력/수직력 특성 분석
양원진(Yang Won-Jin),박찬배(Park Chan-Bae),이형우(Lee Hyung-Woo),권삼영(Kwon Sam-Young),박현준(Park Hyun-June),원충연(Won Chung-Youn) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
A light rail transit, using a linear induction motor, is generally composed with reaction plates along railroad track and the three phase primary on the vehicle. This linear induction motor is driven to keep clearance between the primary and the secondary of the ground for preventing any contact. Therefore efficiency and power factor is very low. In addition, the reaction plate installed on the ground throughout entire railway is impossible to keep uniform gap and it may cause system deterioration. In this paper, A rotary-type small-scale model of a linear induction motor for various characteristic analysis is designed. Thrust force, normal force and input current of the model by air-gap variation have been analyzed by using a Finite Element Method (FEM). The effects of air-gap variation on system performance have been considered by analysis results.
능동위상배열레이다에서 태양을 이용한 수신빔패턴 특성 측정기법 연구
권세웅(Se-Woong Kwon),김한생(Han-Saeng Kim),권양원(Yang-Won Kwon),이기원(Ki-Won Lee) 한국전자파학회 2021 한국전자파학회논문지 Vol.32 No.6
레이다의 빔패턴은 무반향챔버와 같은 특정 시설에서 측정되며, 물리적으로 큰 레이다는 운용환경에서 빔패턴 측정가능한 시설로 이동이 어렵고 비용이 많이 소모된다. 만약 레이다가 실제 환경에 존재하는 지형지물이나 천체를 이용하여 빔패턴의 특성을 확인할 수 있다면, 비용 측면에서 효과적인 레이다 운용유지 능력을 제공할 수 있다. 태양은 어느 위치에서나 상시 존재하는 천체이고, 레이다에서 열잡음 형태로 측정 가능하므로 모니터링에 유용하나, 주변 전파 환경에서 수신되는 간섭신호의 영향으로 성능 점검 자동화에 어려움이 있다. 따라서 본 논문에서는 이러한 문제를 극복하기 위해 자동 점검 기법 및 간섭 제거 방법을 적용하여 실험하고, 실제 환경에서 시험한 결과를 제시한다. A beam pattern of a radar is measured at a specific facility such as an anechoic chamber, and it is difficult and expensive to move a physically large radar from an operating environment to the facility. If a radar can measure beam pattern characteristics with landmark or celestial bodies in an operating environment, it can provide a cost effective maintenance. Sun is a celestial body which exists in an operating environment, and sun noise is easy to monitor automatically. However, interferences interfere with the automatic detection of noise. Therefore, in this study, we implemented and tested an automatic sun noise monitoring method and an effective interference suppression method in a radar operating environment.