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비정형격자 압력기준 유동해석기법을 이용한 비압축성 유동해석
김종태(J. Kim),김태준(T.J. Kim),김용모(Y.M. Kim) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
The pressure-based methods are very popular in CFD because it requires less computer core memory compared to other coupled or density-based solvers. Currently structured-mesh methodology based on pressure-based algorithm is quite mature to apply to the practical problems. The unstructured mesh method needs much more computer memory than the structured-mesh method. However the pressure-based method utilizing the sequential approach does not require very large memory used for unstructured mesh density-based solvers. The present study has developed the unstructured grid pressure-based method. Cell-centered [mite volume method was selected due to robustness for imposing various boundary conditions and easy implementation of higher-order upwind scheme. The predictive capability of present method has validated against several benchmark problems.
김종태(J.T.Kim),김후증(H.J.Kim),김용모(Y.M.Kim),류명석(M.S.Lyu),구영곤(Y.K.Koo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
Expansion chambers are widely used in automotive intake and exhaust silencer systems due to their broadband noise attenuation characteristics. The present study is aiming to examine the transmission loss characteristics of the expansion chamber type mufflers with the pulsating flows. In order to achieve a grid flexibility for complex geometry, this study employs the unstructured mesh algorithm in context with the node-centered finite volume method The present approach has been validated by comparison with the experimental data and axisymetric analytic solutions for concentric expansion chambers<br/>
FEM을 이용한 대칭형 보강재에 보강된 평판의 음향방사에 관한 연구
김종태(J. T. Kim),김택현(T. H. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The determination of sound pressure radiated from periodic plate structures is fundamental in the estimation of noise level in aircraft fuselages or ship hull structures. As a robust approach to this problem, here a very general and comprehensive analytical model is developed for predicting the sound radiated by a vibrating plate stiffened by periodically spaced orthogonal symmetrical beams subjected to a sinusoidally time varying point load. In this these, we experiment with the numerical analysis using the space harmonic series and the SYSNOISE for measuring the vibration mode and character of response causedby sound radiation with adding the harmonic point force in the thin isotropic plate supported by the rectangular lattice reinforcement. We used the reinforcements, beams of open type section like the style of "ㄷ" letter; the space of the beams were chosen to be 0.2m, 0.3m, 0.4m. We studied the behavior of sound pressure levels, analysis of vibration mode between support points, connection between frequency function and sound pressure levels, and connection between position function and sound pressure levels.
PD 제어기를 이용한 회전전동장치의 동특성에 관한 연구
김재경(J. K. Kim),김종태(J. T. Kim),김택현(T. H. Kim),오택열(T. Y. Oh) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The rotating transmission is made up of belts, mass disks and gears. This precise piece of equipment is controlled electro-mechanically by the motor and operation program. The control strategy of the transmission can be changed by belts" stiffness and change of the mass and gear. This transmission can be modeled as a rigid body, and also finds broad application in such diverse fields as machine tools, the cruise control system in automobiles, and control in the attitude and gimbals of spacecraft. The study of the rotating transmission excited by its base motion is not only able to predict the rotational performance, but obtain the fundamental data for vibration isolation. In this thesis, we studied the response abilities such as steady overshoot, undershoot and ect and the response velocities such as rising time, settling time, and ect. in the rotating transmission through PD control experiment.