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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.
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.
류봉조(Bong-Jo Ryu),구경완(Kyung-Wan Koo) 대한전기학회 2010 전기학회논문지 P Vol.59 No.4
This paper deals with the method of vibration measurement of a gun barrel structure using mechanical filter. When a bullet with high speed is moving within a gun barrel type structure with low bending vibration frequencies, it is difficult to measure the bending vibration signals of the structure. For example, noncontact type sensors such as displacement or velocity sensor are not appropriate for the measurement of vibrational signals because of the movement effect of the equipment frame through the moving structures or effect of the ground vibration. One of contact type sensors such as accelerometer is profitable for measurement of vibrational signals because of its wide measurement ranges. In the case of a gun barrel structure including high vibrational signals like shock waves, however, it is necessary to propose vibration measurement method filtering high frequencies. The purpose of the paper is to propose the proper vibrational measurement technique filtering high frequencies of a gun barrel type structure.