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[論文] 자동차 방향지시등 렌즈설계를 위한 CAD 시스템의 개발에 관한 연구
이재원(J. W. Lee),이우용(W. Y. Lee) 한국자동차공학회 1993 오토저널 Vol.15 No.3
This paper presents the development of CAD system for the design of lens of the Turn Signal Lamp that can model and simulate its optical performance. The system consists of three main modules: skin surface modeling module. inner lens modeling module and optical performance simulation module.<br/> Skin surface geometry can be modeled by the input of data file and inner lens can be modeled by the input of only four parameter using its geometric characteristics. Also light distribution pattern, the barometer of optical performance, is generated by means of finite ray tracing method.<br/> The system display modeled geometry, ray tracing and generated light distribution pattern.
하세윤(S. Y. Ha),이홍우(H. W. Lee),조진래(J. R. Cho),박태학(T. H. Park),이우용(W. Y. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
This paper deals with the analytic and FEM analysis of sloshing frequency response for incompressible, invicid and irrotational flow in two dimensional rectangular tank. We use Laplace equation based on potential theory as governing equation. For small amplitude sloshing motion, the linearized free surface condition was applied and the solution was calculated by the separation of variables. To avoid the divergence of response at resonance frequencies, artificial damping is introduced. Also, this problem was solved by FEM using 9-node elements in orther to compare with the analytical solution.
이홍우(H. W. Lee),하세윤(S. Y. Ha),조진래(J. R. Cho),박태학(T. H. Park),이우용(W. Y. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
This paper deals with the FEM analysis for Nonlinear sloshing of incompressible, invicid and irrotational flow in two dimensional rectangular tank. We use Laplace equation based on potential theory as governing equation. For large amplitude sloshing motion, kinematic and dynamic free surface conditions derived from Bernoulli equation are applied. This problem is solved by FEM using 9-node elements. For the time integration and accurate velocity calculation, we introduce a predictor-corrector time marching scheme and least square method. Also, numerical stability in tracking of free surface is obtained by direct calculation of free surface location to time variation. Numerical results of sloshing induced by harmonic excitations, while comparing with those of linear theory and references, prove the accuracy and stability. After verification of our program, we analyze sloshing response characteristics to the fluid height and the excitation amplitude.
홍상일(S. I. Hong),김민정(M. J. Kim),조진래(J. R. Cho),박태학(T. H. Park),이우용(W. Y. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
The dynamic response of a baffled fuel-storage tank in turnaround motion is simulated using the ALE finite element method. Fuel-storage tank is a representative example of fluid-structure interaction problems, in which structure deformation and fluid motion interact strongly. For the accurate dynamic-response analysis of this complicated fluid-structure system, we employed ALE(arbitrary Lagrangian-Eulerian) numerical approach. Five types of fuel-storage tank models with respect to the baffle number are considered to examine the effect of baffles on the dynamic-response, such as effective stress, displacement and the free surface motion of internal fluid.