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방진재를 이용한 대형구조물의 철도 진동에 관한 실험적 연구
류봉조(Bong-Jo Ryu),이홍기(李弘基),구경완(Kyung-Wan Koo) 대한전기학회 2011 전기학회논문지 Vol.60 No.6
The paper deals with the vibration isolation of a large structure using an experimental technology. In the case of vibration isolation for the vicinity of a subway or a railroad station, most of vibration isolation techniques using isolation materials with high isolation efficiency only, have been applied. Therefore, the quantitative evaluation and design technologies are required for a vibration isolation of large structures. In this study, firstly, vibration characteristics due to train or subway are analyzed. Secondly, the performance of existing vibration isolation materials such as precision isolation material, elastomer is estimated through the experiments. Thirdly, the performance of a tire isolation material and its frame is tested and evaluated. Finally, it is shown that tire isolation materials can be applied to the vibration isolation or vibration reduction of large structures.
부가 스프링 지지를 갖고 유동유체에 의한 외팔 수직 파이프의 동적 안정성
류봉조(Ryu, Bong-Jo),정승호(Jung, Seoung-Ho),이종원(Lee, Jong-Won) 한국소음진동공학회 2002 한국소음진동공학회 논문집 Vol.12 No.12
The paper presents the dynamic stability of a vertical cantilevered pipe conveying fluid and haying translational linear spring supports. Real pipe systems may have some elastic hanger supports or other mechanical attached parts. which can be regarded as attached spring supports. Governing equations are derived by energy expressions, and numerical technique using Galerkin's method is applied to the equations of small motion of the pipe. Effects of spring supports on the dynamic stability of a vortical cantilevered pipe conveying fluid are fully investigated for various locations and spring constants of elastic supports.
끝단 강체를 갖고 맥동 제어추력을 받는 양단 자유보의 동적 안정성
류봉조,이규섭,성윤경,최봉문,Ryu, Bong-Jo,Lee, Gyu-Seop,Seong, Yun-Gyeong,Choe, Bong-Mun 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.1
The paper describes the parametric instability of free-free beams subjected to a controlled pulsating follower force. The beam has a tip rigid body not a mass point, and the direction of pulsating follower force is controlled by the direction control sensor. Equations of motion are derived by Hamilton's principle and the instability regions are obtained by finite element formulation. The effects of magnitude, rotary inertia, the distance between free end of the beam and the center of gravity of the rigid body on the instability types and regions are investigated by the change of the constant and periodic part of the follower force.