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Recently, on the view point of capacity of memory, the media of optical disk recording system is increasing. Moreover, its disk rotation speed will be increasing according to its large memory capacity, such as more than 10000[rpm]. The optical disk system has a radial run-out originate from the disk eccentricity. For this reason, the optical disk system has the periodic disturbance which is synchronized...
This paper proposes a new tracking control system for high speed optical disk recording system. The proposed tracking control system consists of triple compensation loops of tracking error which are the robust feedback control loop, Zero Phase Error Tracking (ZPET) feedforward control loop and a new additional DC offset compensation loop. The feedback controller is the most inner loop which is based...
This paper proposes the modified zero phase error tracking-feedforward control (ZPETm-FFC) system. The ZPETm-FFC system is higher-speed and more precise control system than the conventional control systems which are the feedback controller of phase lead-lag filters or the ZPET-FF control (ZPET-FFC) system. Numerical simulations show the performances of ZPET-FFC system in detail of practical conditions,...
In next generation optical disk system, the disk rotation speed becomes nearly equal to 10000[rpm]. Since the optical disk systems have a radial run-out, its phenomenon becomes the periodic disturbance whose bandwidth depends on the disk rotational speed. Hence, the tracking control system of next generation optical disk recording system should have the robust precision control against the high speed...
This paper proposes a high-performance robust tracking control system for next-generation optical disc system. The proposed tracking control system consists of robust feedback control system and perfect tracking control system based on error-prediction. The proposed robust feedback control system has a good performance of sudden disturbance suppression for improving a free parameter. Moreover, the...
This paper deals with a design problem of an adaptive output feedback tracking control for systems with a parallel feedforward compensator (PFC) introduced in order to realize the output feedback exponential passive (OFEP) augmented control system. It is well known that one can easily design an adaptive output feedback control system for nonlinear systems satisfying the OFEP conditions. We adopt introduceing...
In optical recording system, the tracking servo system must follow the track of optical disk against the influence of the track eccentricity and the force disturbance. The influence of the track eccentricity becomes periodic disturbance. The influence of force disturbance caused by shaking is treated as sudden disturbance. The conventional tracking servo system is constructed by using the only feedback...
In optical recording system, the tracking servo system must follow the track of optical disk against the influence of the track eccentricity and the force disturbance. In tracking servo system, the influence of the track eccentricity becomes periodic disturbance. The influence of force disturbance caused by shaking is treated as sudden disturbance. Several control methods suppressing the periodic...
It is well-known that one of the major limitations to achieve a good performance in mechanical systems is the presence of friction. High resolution positioning systems operating with accuracies in nanometer region usually exhibit relatively large steady-state tracking errors or even oscillations if controllers are designed without considering friction. Consequently, this paper aims at improving the...
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