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임봉혁(Yim Bong-Hyuk),한형석(Han Hyung-Suk),정정훈(Jung Jung-Hoon),김영중(Kim Young-Joong),김병현(Kim Byung-Hyun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Since Maglev vehicle is run over an elevated guideway, the vibrational characteristics of guideway affect the running behavior of the vehicle and guideway. The design of a guideway has a strong effect on the costs of constructing guideways, therefore optimized design of the guideway satisfying running performance is needed for the commercialization of the Maglev vehicle. With an analysis program for dynamics of Maglev vehicles, the dynamic responses of the Maglev vehicle with electromagnet suspension are numerically analyzed according to changes in fundamental natural frequency ratio of a guideway.
한형석(Han Hyung-Suk),임봉혁(Yim Bong-Hyuk),이남진(Lee Nam-Jin),문석준(Moon Seok-Joon),정정훈(Jung Jung-Hun) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Electromagnetic suspension, the suspension system used for Maglev trains, is now being applied to urban and inter-city transportation systems, offering environmental benefits. This suspension system is actively controlled to stabilize the suspended vehicle as it runs over an elevated guideway, which, for various reasons, may have deviations in its height. For this reason, frequency responses of the suspension to height deviations must be predicted in the system design cycle. The equations of motion of the electromagnetic suspension employing the 5 state feedback control law are derived for frequency analysis. The results of this paper could be used to determine design requirements for the urban Maglev transportation system currently under development in Korea.
가이드웨이 진동 특성이 자기부상열차 동특성에 미치는 영향
한형석(Han, Hyung-Suk),임봉혁(Yim, Bong-Hyuk),이남진(Lee, Nam-Jin),허영철(Hur, Young-Chul),권정일(Kwon, Jung-Il) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.3
The electromagnet in Maglev vehicles controls the voltage in its winding to maintain the air gap, a clearance between the electromagnet and guideway, within an allowable deviation, with strongly interacting with the flexible guideway. Thus, the vibration characteristics of guideway plays important role in dynamics of Maglev vehicles using electromagnet as an active suspension system. The effects of the guideway's vibrational characteristics on dynamics of the Maglev vehicle UTM-01 are analyzed. The coupled equations of motion of the vehicle/guideway with 3 DOFs are derived. Eigenvalues are calculated and frequency response analysis is also performed for a clear understanding of the dynamic characteristics due to guideway vibration characteristics. To verify the results, tests of the urban Mgalev vehicle UTM-02 are carried out. It is recommended that the natural frequency of the guideway be minimized and its damping ratio in the Maglev vehicle with a 5-states feedback control law as a levitation control law.
한형석(Han Hyung-Suk),김숙희(Kim Sook-hee),임봉혁(Yim Bong-Hyuk),권정일(Kwon Jung-Il),허영철(Hur Young-Chul) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The irregularities in the guideways used in the Maglev transportation system that result from surface roughness and deflection of guideway have strong effects on the dynamic characteristics of Maglev vehicles, because the electromagnetic suspension of Maglev vehicles strongly interacts with the guideway. For this reason, a numerical prediction of air gap responses to these irregularities is desirable to improve aspects of running performance, such as stability and passenger comfort, while minimizing aesthetic impact and construction cost. This paper presents a procedure to predict the air gap response which is a criteria for stability, and investigates the responses with the goal of attaining higher travel speeds in the urban Maglev vehicle UTM-01 utilizing electromagnetic suspension.