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한형석,정의봉,Han, Hyung-Suk,Jeong, Weui-Bong The Society of Naval Architects of Korea 2009 大韓造船學會 論文集 Vol.46 No.3
Pipe system widely used in a ship is usually attached to the hull of a ship, and its vibration lead to structure-borne noise. Rubber mount is usually used as a vibration isolator of a pipe in a ship. In this paper, the effects of several factors, besides the stiffness and damping of the rubber mount, on vibration-isolating performance are taken into consideration. The parameters considered in this paper are hardness of the rubber material, painting on the rubber and deformation from clamping. Through the results of parametric study, the effective specifications of rubber mount are suggested to improve vibration-isolating performance. The performance under fluid flowing condition is calculated numerically and verified experimentally.
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.
모드중첩법을 이용한 자기부상열차/유연궤도 동적 모델링 연구
한형석(Han Hyung Suk),이종민(Lee Jong Min),김영중(Kim Yung Joong),김동성(Kim Dong Sung),김숙희(Kim Sook Hee) 한국철도학회 2006 한국철도학회 세미나자료 Vol.- No.-
In general, the Maglev vehicle is run over an elevated guideway consisting of steel or concrete structure. Since the running behavior of the vehicle is affected by the flexibility of the guideway, the consideration of the flexibility of guideway is needed for evaluating the dynamics of both the vehicle and guideway. A new method based on flexible multibody dynamics is proposed to model the Maglev vehicle. This method combines the levitation controller, vehicle, and guideway into a coupled model. To verify the method, an urban transit is analyzed using the method and discussions are carried out.