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송승관(Seung Gwan Song),김태용(Tae Yong Kim),곽기열(Gi Yeol Gwak),김중경(Joong Kyoung Kim),김종순(Jong Soon Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Radiators are used in order to prevent temperature rise of the transformer core and windings. This study has performed to analyze Radiator Support Structure about dead and seismic loading condition. At the connection area between radiator flange part and Tank flange Part, the shear, tension and von-mises stress in the connected bolt shall not exceed allowable stress. This paper shows that the structural strength has been improved by applying the reinforcement band on the radiator.
송승관(Song, Seung-Gwan),곽동희(Kwak, Dong-Hee),김창부(Kim, Chang-Boo) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.2
In this paper, we present the equations of motion by which the natural vibration of a rotating annular disk can be analyzed accurately. These equations are derived from the theory of finite deformation and the principle of virtual work. The radial displacements of annular disk at the steady state where the disk is rotating at a constant angular velocity are determined by non-linear static equations formulated with 1-dimensional finite elements in radial direction. The linearlized equations of the in-plane vibrations at the disturbed state are also formulated with 1-dimensional finite elements in radial direction along the number of nodal diameters. They are expressed as in functions of the radial displacements at the steady state and the disturbed displacements about the steady state. In-plane static deformation modes of an annular disk are used as the displacement functions for the interpolation functions of the 1-dimensional finite elements. The natural vibrations of an annular disk with different boundary conditions are analyzed by using the presented model and the 3-dimensional finite element model to verify accuracy of the presented equations of motion. Its results are compared and discussed.
김창부(Kim Chang-Boo),송승관(Song Seung Gwan) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we present the equations of motion by which the natural vibration of a rotating annular disk can be accurately analyzed. These equations are derived from the theory of finite deformation and the principle of virtual work. The radial displacements of annular disk which is rotating at constant angular velocity are determined by non-linear equations formulated using 1-dimensional finite elements in radial direction. The equations of the in-plane vibrations at disturbed state are also formulated using 1-dimensional finite elements in radial direction along the number of nodal diameters. They are expressed as in functions of the radial displacements at the steady state and the disturbed displacements about the steady state. In-plane static deformation modes of the annular disk are used as the interpolation functions of 1-dimensional finite elements in radial direction. The natural vibrations of an annular disk with different boundary conditions are analyzed by using the presented model and the 3-dimensional finite element model to verify accuracy of the presented equations of motion. Its results are compared and discussed.
곡선 보의 면외 진동해석을 위한 얇은 원형 보 유한요소
김창부(Kim Chang-Boo),김보연(Kim Bo Yeon),송승관(Song Seung Gwan) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we present a thin circular beam finite element for the out-of-plane vibration analysis of curved beams. The element stiffness matrix and the element mass matrix are derived respectively from the strain energy and the kinetic energy by using the natural shape functions which are obtained from an integration of the differential equations of the finite element in static equilibrium. The matrices are formulated with respect to the local polar coordinate system or to the global Cartesian coordinate system in consideration of the effects of shear deformation and rotary inertias. Some example problems are analysed. The FEM results are compared with the theoretical ones to show that the presented finite element can describe quite efficiently and accurately the out-of-plane motion of thin curved beams.