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평면 방향의 구속조건과 들러붙음 현상을 고려한 사출성형제품의 변형 해석
양상식(S. S. Yang),권태헌(T. H. Kwon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Deformation analysis of injection molded articles whose geometry is considered as the assembly of thin flat plates has been conducted by simulation and experiment. For the simulation, the thermoviscoelastic stress and the in-mold deformation are calculated during in-mold analysis. Emphasis is made on lateral boundary conditions considering in-plane mold constraint and sticking effect between part and mold wall. Upon ejection, the instantaneous deformation takes place. During an out-of-mold cooling, the thermoviscoelastic model based on the effective temperature is used. The free volume theory is employed to represent the nonequilibrium density behavior during fast cooling. For the experiment, the shrinkage of PS parts was measured. Two mold geometries, square flat plate and one with two side walls, were tested. Parametric study was performed to investigate the effect of processing conditions on the shrinkage. Measured shrinkages were compared with simulation results.
전체 차량 능동 현가 시스템을 위한 PID제어기의 설계
안세영(S.Y.Ahn),양상식(S.S.Yang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The destination of Vehicle Suspension system studies is to simultaneously improve ride comfort and handling safety that conflicts each other. In this paper, PID Controller is designed for Full vehicle active suspension system. Using a necessary information of output feedback state and output optimal control method, proper Sky-hook damper technique that have been applied to quarter car model is implemented to Full car model. Except for velocity feedback, absolute acceleration and displacement, relative velocity and displacement's usefulness is tested.From this result, PID controller is implemented. The improvements of the presented control strategy's effect are verified by computer simulation.<br/>
능동형 현가장치의 설계 및 전체차량 해석(Ⅱ): 능동형 현가장치 장착차량 해석
한형석(H.s. Han),박태원(T.w. Park),박세진(s. J. Park),양상식(s.s. Yang) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The analysis of a full vehicle with active suspension designed with LQG/LTR method is ca rried out to study the performance of active suspension. For this study a model for a full vehicle is modeled and its reliability is confirmed by quasi-static analysis. Sensors ,actu ators. LQG/LTR logic are added to the full vehicle model then with the 'analysis results of the full vehicle, we confirmed the performance of active suspension when the designed contr oller is used for active suspension.<br/>