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A multi-period repetitive control system is a type of servomechanism for a periodic reference input. Even if a plant does not include time-delay, the transfer function from the periodic reference input to the output and that from the disturbance to the output of the multi-period repetitive control system generally have an infinite number of poles. The purpose of this paper is to propose the concept...
The multi-period repetitive control system is a type of servomechanism for periodic reference input. Even if the plant does not include time-delay, the transfer function from the reference input to the output and that from the disturbance to the output of the multi-period repetitive control system generally have an infinite number of poles. In order to specify the input-output characteristic and the...
The modified repetitive control system is a type of servomechanism for the periodic reference input. Using previously proposed modified repetitive controllers, even if the plants does not includes time-delay, the transfer function from the periodic reference input to the output and that from the disturbance to the output have an infinite number of poles. From the practical point of view, it is desirable...
The head-positioning control system of a hard disk drive (HDD) must enable precise positioning and high-speed access. Mode-switching control (MSC) has widely been used to meet these control requirements. One of the issues with MSC is how to determine the controller-switching strategy, which needs decisions on the controller's switching conditions and its initialization. We propose a method that utilizes...
The head-positioning control system of a hard disk drive (HDD) must enable precise positioning and high-speed access. Mode-switching control (MSC) has widely been used to meet these control requirements. One of the issues with MSC is how to determine the controller-switching strategy, which needs decisions on the controller's switching conditions and its initialization. We propose a method that utilizes...
The design and implementation of adaptive LS estimation and fault recovery procedure for PZT-actuated milli-actuator were presented. We confirmed that the adaptive estimation method identified the milli-actuator DC-gain precisely and the fault recovery procedure detected the degradation of milli-actuator gain during track-following data reading/writing operation.
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