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파라메터오차 및 모달필터오차에 대한 독립모달공간 제어기법의 강인성 해석
황재혁,김준수,Hwang, Jai-Hyuk,Kim, Joon-Soo 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
In this study, the effect of parameter and modal filter errors on the vibration control characteristics of flexible structures is analyzed for IMSC ( Independent Modal Space Control). If the control force is designed on the basis of the mathematical model with the parameter and modal filter errors, the closed-loop performance of the vibration control system will be degraded depending on the magnitude of the errors. An asymptotic stability condition of the system with parameter and modal filter errors has more significant effect on the stability condition of the system with parameter and modal filter errors has been drived using Lyapunov approach. It has been found that modal filter error has more significant effect on the stability of closed-loop system than parameter error does. The extent of the response deviation of the closed-loop system is also derived and evaluated using operator thchniques.
소형위성 카메라의 영상안정화를 위한 초점면부 보정장치 제어
황재혁(Jai-Hyuk Hwang),강명수(Myoung-Soo Kang),배재성(Jae-Sung Bae),박진호(Jean-Ho Park) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
In this paper, micro-position control of focal plane compensation device that applicable to the small satellites has conducted. The device actuated by stacked type piezoelectric actuator that can move fast and infinitesimally. However, this actuator has a hysteresis so that It is difficult to modeling mathematically. Therefore, mathematical modeling has been practiced by using MATLAB system identification toolbox and the device requires four models and PID controllers for covering 0~50Hz of input frequency range. According to bode plots of control systems and control simulations, a controller based on 50Hz model, one of four PID controllers, has excellent performance for 0~50Hz range than that of others. In addition, the simulation results is verified by experimental results. Position control has been successful and the maximum output error is ± 1.2㎛.