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박민규(M. G. Park),이동호(D. H. LEE),이호상(H. S. Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A computer code was developed to simulate all three stages of the injection molding process ? filling, packing and cooling by finite element method. The constitutive equation used here was compressible Leonov model. The PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. Based on the simulation, the Taguchi method was used to investigate the influences of injection molding conditions on the birefringence of a center gate disk. In addition, the optimal processing conditions were selected to minimize the birefringence and the birefringence difference along the positions of the disk.
불확실성을 포함한 전기 유압 액츄에이터 시스템의 적응 백스테핑 제어
박민규(M. G. Park),김한메(H. M. Kim),박성환(S. H. Park),김종식(J. S. Kim) 유공압건설기계학회 2008 유공압건설기계학회 학술대회논문집 Vol.2008 No.10
In this paper, the variation of the effective bulk modulus, friction, and external disturbance are considered as uncertainties of electro-hydrostatic actuator(EHA) systems. To solve the problems due to these system uncertainties, an adaptive back-stepping control(ABSC) scheme is designed. However, this control scheme may have performance limitation due to system uncertainties not estimated. Therefore, to overcome that problem, fuzzy-neural network(FNN) algorithm is used to reject system uncertainties. The effectiveness of the ABSC system with the FNN was compared to that of the ABSC system without the FNN in a computer simulation.