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Hard disk drive (HDD) is a mass produced item so are its components including the actuator used for head positioning servomechanism. Transfer characteristics of these actuators vary within a tolerance limit and a nominal model representing the family of actuators is used for controller design. Equally good performance is not possible for all actuators with the designed controller. However, as the...
This paper presents a discrete-time robust nonlinear control method to achieve fast and accurate set-point tracking for servo systems subject to actuator saturation and disturbances. The idea here is to use a combination of composite nonlinear feedback (CNF) control and disturbance estimation cum compensation. The CNF control is responsible for superior transient performance, i.e., to guarantee a...
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