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최주호(J.H. Choi),곽현구(H.G. Kwak),R. Grandhi 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
An efficient boundary-based technique is developed for addressing shape design sensitivity analysis in supercavitating flow problem. An analytical sensitivity formula in the form of a boundary integral is derived based on the continuum formulation for a general functional defined in potential flow problems. The formula, which is expressed in terms of the boundary solutions and shape variation vectors, can be conveniently used for gradient computation in a variety of shape design in potential flow problems. While the sensitivity can be calculated independent of the analysis means, such as the finite element method (FEM) or the boundary element method (BEM), the FEM is used for the analysis in this study because of its popularity and easy-to-use features. The advantage of using a boundary-based method is that the shape variation vectors are needed only on the boundary, not over the whole domain. The boundary shape variation vectors are conveniently computed by using finite perturbations of the shape geometry instead of complex analytical differentiation of the geometry functions. The supercavitating flow problem is chosen to illustrate the efficiency of the proposed methodology. Implementation issues for and optimization procedure are addressed in this flow problem.
충격에너지와 적층조건에 따른 CFRP원형부재의 충격특성
최주호(J.H Choi),나승우(S.W Ra),차천석(C.S Cha),김지훈(J.H Kim),양인영(I.Y Yang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The CFRP(Carbon Fiber Reinforced Plastics) Circular members were made of 8ply unidirectional prepreg sheets stacked at different angles (15°,45°and 90°) and interface numbers (2, 4 and 6). CFRP is an anisotropic material which is the most widely adapted lightweight structural member. In this study, the impact energy at the crosshead speed of 5.52m/s, 5.14m/s and 4.57m/s are 611.52J, 529.2J and 419.44J. Based on the collapse characteristics of CFRP member, the collapse characteristics and energy absorption capability were analyzed. The purpose is to examine experimentally absorption behavior and strength evaluation depending on changes in the stacking configuration when the CFRP circular member with different stacking configuration is exposed to separate impact velocity in addition, considered the dynamic characteristics.
박길문,박선종,최주호,유영태,Park, G.M.,Park, S.J.,Choi, J.H.,Yoo, Y.T. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.3
A system of conservation equations for steady, oscillatory and pulsating duct flows are solved analytically by linearizing non-linear convective terms. Analytical solutions of velocity profiles for these flows are obtained in the form of infinite series. The experimental study for the air flow in a square duct ($40mm{\times}40mm$ and 400 mm long) is carried out to measure velocity profiles and other parameters by using a hot-wire anemometer with data acquisition and processing system. Major characteristics of the flows such as the classification of flow patterns, determination of critical Reynolds number and velocity profiles is accomplished from the experismental results.