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여동준(D. J. Yeo),최명수(M.S. Choi),변정환(J. H. Byun),서정주(J. J. Suh),양정규(J. K. Yang),문덕홍(D. H. Moon) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with the free vibrations of folded plates by the transfer influence coefficient method. The governing equations of a non-circular cylindrical shell including a plate as special case are written in a coupled set of first order matrix differential equations using the transfer matrix. The Runge-Kutta-Gill Integration method are used to solve the governing differential equation. The natural frequencies and corresponding mode shapes are calculated numerically for the folded plate of various crank angles. And all boundary conditions and the intermediate supports between folded plate and foundation could be treated only by adequately varying the values of the spring constants.
여동준(D. J. Yeo),조인순(I. S. Cho),최명수(M. S. Choi) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper deals with the free vibrations of a conical shells with variable thickness by the transfer influence coefficient method. The classical thin shell theory based upon the Flugge theory is assumed and the governing equations of a conical shell are written as a coupled set of first order matrix differential equations using the transfer matrix. The Runge-Kutta-Gill integration method are used to solve the governing differential equation. The natural frequencies and corresponding mode shapes are calculated numerically for the conical shells with variable thickness and various boundary conditions at the edges. And all boundary conditions and the intermediate supports between conical shell and foundation could be treated only by adequately varying the values of the spring constants.
여동준(D. J. Yeo),최명수(M. S. Choi),변정환(J. H. Byun),양정규(J. K. Yang),서정주(J. J. Suh) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, the authors formulated analytical algorithm for the in-plane free vibration of a annular plate with intermediate support part by the transfer influence coefficient method (TICM) which is based on the successive transmission of influence coefficients on nodal circumferences. To confirm the effectiveness of the suggested algorithm, we analyzed the free vibration of a annular plate with three typical intermediate support parts by the TICM and the Transfer matrix method (TMM) on a personal computer. The computational result was that the TICM was superior to the TMM in the in-plane free vibration analysis of a annular plate with rigid intermediate supports.
최명수(M. S. Choi),여동준(D. J. Yeo),서정주(J. J. Suh),양정규(J. K. Yang),문덕홍(D. H. Moon) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In order to analyze accurately the forced vibration of a structure by using the finite element method (FEM), we have to model the structure as a numerical model with many degrees-of-freedom. However, in this case, the FEM needs much computation time and storage. The authors developed the finite element-transfer stiffness coefficient method (FE-TSCM) for overcoming the drawback of the FEM. In this paper, the authors apply the FE-TSCM to the in-plane forced vibration analysis of plates with various shapes. Two numerical examples, a rectangular plate and a triangular plate, are used to compare the results of the FE-TSCM and the FEM. Through the numerical calculation, we confirm that the FE-TSCM can be applied to the plates with various shapes and is effective to in-plane forced vibration analysis of plates.
변정환(J. H. Byun),여동준(D. J. Yeo),양주호(J. H. Yang) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A motor cylinder apparatus is widely used to transfer a load in industrial applications. The apparatus is composed of a motor and power transmission elements such as worm gear and screw. In this case, the nonlinear friction in the machine elements, which is increased in the low speed range, has a bad influence on the control performance. And the variation of a load can be act as a disturbance with the nonlinear friction. Then, both nonlinear friction and variation load cause the steady state error in a motor cylinder apparatus driven at a low speed. To overcome this problem, the control scheme of a motor cylinder apparatus is proposed in this study. This control scheme consists of a feedback controller in the outer-loop to achieve nominal control performance and a disturbance observer in the inner-loop to compensate internal and external disturbance. Especially the filter of a disturbance observer is designed from viewpoint of robust stability. Finally, the simulation result shows that the proposed control system is effective for the disturbance elimination and stability to the model uncertainty.
횡동요 억제용 곡선레일의 수평유지제어시스템 구축에 관한 연구
변정환(J. H. Byun),여동준(D. J. Yeo) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A delivery ship is used to handle the cargo with the crane to/from the ships. The ship is inclined in the direction of a cargo which is hung on a crane. In this case, a arc shaped rail should be in the equilibrium state to get good anti-rolling performance. In this study, a device and control algorithm are developed to take accurate and quick equilibrium of the rail. The device is composed of a hinged immovable support and two screw jacks. And the control algorithm demands two controllers. One controller is designed such that the screw jack 1 and 2 follow the position reference signal generated by a tilt sensor. The other controller of is designed to remove the synchronous error occurred between jack 1 and jack 2. The simulation results show that the desirable control performance is achieved.