Positioning Control of Piezotube Actuator Using Artificial Immune Algorithm

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.