Browsing by Author "Wu, P. J."

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Dual-Axis Control Using Piezotube Actuator Based on Immune Algorithm
(2016)
Liu, T. S.
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Wu, P. J.
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機械工程學系
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Department of Mechanical Engineering
Piezoelectric actuators are widely employed in micropositioning and nanopositioning due to properties of high resolution, high bandwidth, and high stiffness. This study uses an immune algorithm to control a piezotube actuator. The immune algorithm includes antigens reorganization, antigen integration and appearance, the stimulation and suppression chains between antibodies in the immune system, and immune response of artificial immune system. This study treats runout disturbance as antigens in track following whereas environment disturbance as antigens in focusing. For control robustness, we define suitable antibodies to restrain antigens. In experiments, we treat disk deformation as antigens and proportional-integral-derivative (PID) gains as antibodies. Established by PID gains, immune database helps realize the immune algorithm. In track following experiment, the closed-loop response precision is 5%.
Positioning control of piezotube actuator using artificial immune algorithm
(2007)
Liu, T. S.
;
Wu, P. J.
;
機械工程學系
;
Department of Mechanical Engineering
This study develops an artificial immune algorithm for the piezotube actuator of a disk-drive pickup head in the presence of runout disturbance. The immune algorithm includes antigens reorganization, antigen integration and appearance, the stimulation and suppression chains between antibodies in the immune system, and immune response of artificial immune system. We define suitable antibodies to restrain antigens. In experiments, we treat disk deformation as antigens and proportional-integral-derivative (PID) gains as antibodies. Established by PID gains, the immune database helps realize the immune algorithm.