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100㎾h 급 플라이휠 에너지 저장장치용 자기베어링 시스템 설계
모상수(S.S. Mo),유승열(S.Y. Yoo),이정필(J.P. Lee),한영희(Y.H. Han),최상규(S.K. Choi),오승우(S.W. Oh),노명규(M.G. Noh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Flywheel energy storage systems (FESS) have advantages over other types of energy storage methods due to their infinite charge/discharge cycles and environmental friendliness. In order to maximize the efficiency of the system, a FESS often employs magnetic suspension technology using superconducting bearings and/or active magnetic bearings. In this paper, we present a design process for the active magnetic bearings for a 100kWh class FESS. The system has two radial bearings and one thrust bearing. The radial bearings were designed to provide sufficient force slew rate considering the unbalance disturbance at the operating speeds. We also present the dynamic model of the rotor and the design process of the bearing controller.
평판스프링을 가진 열동형 과부하 릴레이 메커니즘의 모델링 및 동적해석
안길영(K. Y. Ahn),정원선(W. S. Chung),오일성(I. S. Oh),신봉수(B. S. Shin),오승우(S. W. Oh),강병덕(B. D. Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A thermal overload relay is a device that transmits the off signal to the magnetic contactor before an<br/> electric motor or machine is damaged due to over current. Such a relay generally uses a reversal mechanism<br/> to change rapidly the steady state into the configuration for transmitting the off signal. Here, the mechanism<br/> consists of a flexible flat spring and coil spring. Also, in such a relay, the bimetal used to compensate for the<br/> effect of surrounding temperature acts like a flat spring. In this paper, the dynamic behavior of the relay<br/> mechanism with a reversal mechanism is modeled and analyzed using ADAMS. The flexible flat spring is<br/> modeled using a beam element and its model is verified through the free vibration experiment of the spring.<br/> Comparing the simulation results of the relay with experimental responses, the derived dynamic model is<br/> verified.
조현철 ( H. C. Jo ),오승우 ( S. W. Oh ),이기훈 ( G. H. Lee ),배영주 ( Y. J. Bae ),박권하 ( K. H. Park ) 한국분무공학회 2002 한국액체미립화학회지 Vol.7 No.2
N/A Liquefied petroleum gas (LPG) has been used as motor fuel due to its low emissions and low cost. This study addresses the analysis of the LPG spray behavior near injection nozzle. The LPG spray photographs are compared with sprays of diesel fuel at the same conditions. The LPG spray photos show that the dispersion characteristic depends very sensuously on the ambient pressure soon after injection. The spray angle is very wide in a low ambient pressure condition until the saturated pressure at this test condition, but the angle value is quickly reduced at the condition over the pressure.