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Examining adaptive trackers for a class of the first-order linear continuous-time plants, with different estimators, and the modified certainty equivalence pole-placement control law, we overcome the difficulty of a loss of stabilizability (or controllability) when the estimate of the plant gain is zero and point out a few substantive mistakes of the results from Middleton and Kokotovic's paper (1992)...
This paper concerns the nonfragile guaranteed cost control problem for a class of nonlinear discrete-time dynamic systems with time-varying state delay and controller gain perturbations. The problem is to design a memoryless state feedback control law such that the closed-loop system is asymptotically stable and the closed-loop cost function value is not more than a specified upper bound for all admissible...
A novel approach for robust restructurable/reconfigurable control synthesis is proposed using a model-matching approach. Based on an augmented system structured by the nominal control system and the faulty system, the objective of restructure/reconfigurable control synthesis is to minimize the difference between the transfer matrix of the reconfigured closed-loop system and that of the nominal closed-loop...
In this paper, we deal with the yaw control problem of a small-scale helicopter mounted on an experimental platform. The yaw dynamics of helicopter involve input nonlinearity, time-varying parameters and the couplings between main and tail rotor. An attractive control strategy that combines neural networks with traditional adaptive controls has been successfully used for yaw control with input nonlinearities...
An approach for designing a controller for single-input single-output slowly varying second-order linear systems is described in this paper. The approach utilizes the generalized multiple scales (GMS) method to obtain an equivalent transfer function representation of the varying system, which carries an accurate information about the system dynamic properties. With such representation, the classical...
The stabilization problem of a class of linear, discrete-time, time-varying, uncertain systems is considered. The elements of the dynamical matrix A(middot) of a given time-varying system are modelled as unknown time functions taking values inside known compact sets. The elements of A(middot) are varying inside a fixed set for a sufficiently long time interval, and, at some unknown time instants,...
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