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In this paper, we investigate a novel adaptive design approach for nonlinear systems as an exploration of the new challenging topic on dealing with both parametric and nonparametric internal uncertainties in adaptive control of discrete-time nonlinear systems. The existence of both two kinds of uncertainties makes it very difficult or even impossible to apply the traditional recursive identification...
This paper focuses on compensation for external vibration effect on the positioning accuracy of hard disk drives. A feedforward controller is designed to attenuate the effect with the aid of a sensor to detect external vibrations. Loop shaping in frequency domain and H∞ method in state space are used to design the feedforward controller. The application results in a 1.8-inch disk drive with an accelerometer...
This paper presents an effective scheme of direct adaptive fuzzy control for a class of nonlinear systems with unknown triangular control gain structure. The design is based on the principle of sliding mode control and the approximation capability of the first type fuzzy systems. By introducing the adaptive compensation for optimal approximation error, the closed-loop control system is shown to be...
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