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액체음극에서의 금속 수지상 성장 억제를 위한 교반기 성능평가
김시형,윤달성,유영재,백승우,심준보,안도희,Kim, Si-Hyung,Yoon, Dal-Seong,You, Young-Jae,Paek, Seung-Woo,Shim, Joon-Bo,Ahn, Do-Hee 한국방사성폐기물학회 2009 방사성폐기물학회지 Vol.7 No.2
An electrolytic system (zinc anode-gallium cathode) was setup to evaluate the performance of several stirrers prepared for this study, where stirrers have been used to prevent uranium from forming dendrite on the cathode in pyrochemical process. In the case of no-stirring condition, zinc dendrites began to grow on the gallium surface in 1 hour and some dendrite grew out of the cathode crucible around 6 hours. When a rectangular stirrer or a tilt stirrer was rotated, at 40${\sim}$150 rpm, to mix the liquid gallium cathode, dendritic growth of zinc metal was prevented irrespective of revolution speed, but some of the deposits overflowed out of the cathode crucible owing to the large centrifugal forces at 150 rpm. The harrow stirrer did not nearly retard the dendrite growth at 40 rpm, but the dendrite growth was retarded at higher than 100 rpm and the zinc deposits also did not overflow at 150 rpm. Pounder could also prevent the dendrite growth to some extent but it had some difficulties in operation compared with other types of stirrers.
이중 선형 감쇠특성을 갖는 새로운 형태의 MR 댐퍼 설계 및 해석
김보규(Bo-Gyu Kim),윤달성(Dal Seong Yoon),김기우(Gi-Woo Kim),최승복(Seung-Bok Choi) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.4
In this study, we propose a novel MR damper with bilinear damping characteristics realized through open-loop control alone. The bilinear damping characteristics are a high damping coefficient at low stroke speed and a low damping coefficient at high stroke speed. This is possible since the damping coefficient is drastically changed by the slope breaking point. The proposed MR damper consists of a main orifice and a bypass orifice, which are activated independently. Unlike conventional MR dampers, the proposed MR damper retains a specific pole shape in the main orifice. Therefore, the effective area of the orifice is controllable through the manipulation of the magnetic field to the main orifice, resulting in control of the damping coefficient. In addition, by controlling the opening or closing of the bypass orifice, drastic changes in the damping coefficient are realized. For validation, mathematical modeling of the proposed MR damper is performed considering the pole shape function and slope breaking point. Subsequently, the damping force controllability with bilinear damping characteristics is analyzed as a function of magnetic field intensity.