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사출성형에서 Fast Multipole Method 를 이용한 금형냉각해석
구본흥(Bon-Heung Koo),최권일(Kwon-Il Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Mold cooling process in injection molding is critical in order to reduce cycle time and improve the quality of molded part. In this paper, a fully three-dimensional mold cooling analysis is developed. Mold heat transfer is considered as cyclic-steady, three-dimensional conduction: heat transfer within the part is treated as a three-dimensional transient heat conduction; heat exchange between the cooling channel surfaces and coolant is treated as a cycle-averaged steady state three-dimensional heat conduction. Numerical implementation includes the application of a hybrid scheme consisting of a 3D BEM based on FMM for mold region and a CVFEM for part. The FMM algorithm dramatically reduces the complexity of matrix-vector multiplication involving a certain type of dense matrix, which can arise out of many physical systems. The present analysis is then used to predict the temperature field for a 3D plastic part geometry.
정성택,김진곤,구본흥,Chung, Seong-Taek,Kim, Jin-Gon,Koo, Bon-Heung 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.8
A warpage analysis program has been developed for fiber-reinforced injection molded parts. The warpage is predicted from the residual stress and anisotropic thermo-mechanical properties coupled with fiber orientation in the integrated injection molding simulation. A simple elastic model is used for the calculation of thermally and pressure-induced residual stresses which are employed as the initial conditions in the structural analysis. To improve the reliability of warpage analysis, a new triangular flat shell element superimposing well-known efficient plate bending and membrane element is presented. The numerical examples address the necessity to use anisotropic models for fiber-reinforced materials and show that predicted warpage is in good agreement with experimentally measured one.
마이크로웨이브를 이용한 폐수 내 고농도 암모니아성질소 제거
신소연 ( So Yeun Shin ),구본흥 ( Bon Heung Koo ),김태현 ( Tae Hyun Kim ),이유학 ( Yu Hak Lee ),안종화 ( Johng Hwa Ahn ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.5
Industrial use of microwave heating as an alternative to conventional heating is becoming popular mainly due to dramatic reductions in reaction time. Therefore, this work experimentally determined the effect of microwave irradiation on ammonia nitrogen removal in wastewater. The effects of air flow rate (0.3~0.9 L/min), treatment temperature (70~100°C), and initial pH (9~11) were characterized. As the air flow rate increased from 0.3 to 0.9 L/min, the ammonia removal rate constant (k) increased from -0.6642 to -1.0755 min-1. As the temperature increased from 70 to 100°C, k increased -0.0338 to -1.0755 min-1. As the pH increased from 9 to 11, k increased -0.2443 to -1.0755 min-1. Ammonia removal was strongly dependent on temperature and pH rather than air flow rate. The results show that microwave irradiation is effective in ammonia nitrogen removal in wastewater due to advantages of fast and effective processing.
박종천(Jong-Cheon Park),김광호(Kwang-Ho Kim),김경모(Kyung-Mo Kim),구본흥(Bon-Heung Koo) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1
In this research, the layout and geometry of U-type ribs in the part, including significant process conditions, are automatically optimized to reduce pan warpage with robustness in consideration. The optimization procedure are based on an iterative redesign methodology integrated with computer aided injection molding simulation, Taguchi's Design of Experiment(DOE), and a direct search-based optimization method. The robustness of a design alternative is efficiently measured by introducing composite noise factor and Taguchi's signal-to-noise ratio. As a solution search methodology, the modified design space reduction method based on orthogonal arrays is employed to exploit an optimal robust design alternative. To illustrate the proposed methodology, a case study is performed on simulation results, where an optimal robust design alternative is obtained with a moderate number of iterations.
이종수(Jongsoo Lee),김종헌(Jonghun Kim),이형주(Hyung-Joo Lee),구본흥(Bon-Heung Koo) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The paper describes the development and application of advanced evolutionary computing techniques referred to as micro genetic algorithms (μGA) in the context of engineering design optimization. The basic concept behind μGA draws from the use of small size of population irrespective of the bit string length in the representation of design variable. Such strategies also demonstrate the faster convergence capability and more savings in computational resource requirements than simple genetic algorithms (SGA). The paper first explores ten-bar truss design problems to see the optimization performance between ,μGA and SGA. Subsequently, μGA is applied to a realistic engineering design problem in the injection molding process optimization.