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This paper presents an investigation of the design and implementation of minimum-variance adaptive controllers for computer hard disk drive (HDD) read-write track following. A common characteristic of minimum-variance controllers, adaptive or not, is that they rely on prediction filters with large high- frequency gains to predict broadband disturbances, and this often produces control-signal saturation...
This paper presents an investigation of the control problem of aiming a laser beam under dynamic disturbances, using light intensity for feedback. The beam is steered with a bi-axial MEMS mirror, which is driven by a control signal generated by processing the beam intensity sensed by a single photodiode. Since the pointing location of the beam is assumed to be not available for real-time control,...
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