Electrical and Electronic Engineering - Research Publications
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ItemA concept of Department of Control Systems(IFAC, 2001-01-01)A concept of the Department of Control Systems is proposed. Motivation for doing this comes from the fact that the field of automatic control has reached its maturity as a scientific and engineering discipline, which is characterised by its specific, original and important goals, problems, methods, methodologies, techniques and technologies. Analysis, synthesis, design, realisation, implementation, maintenance and development of control devices, of controllers and of controlled plants demand highly responsible and fully competent engineers. It is evaluated that they should be educated at the undergraduate level in the Department of Control Systems to become complete automatic control engineers (for short: control engineers).
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ItemA virtual laboratory experience based on a double tank apparatus(IEEE, 2001-01-01)How can a virtual laboratory experience achieve the typical educational outcomes expected from a normal in situ laboratory experience? The paper deals with this question in the context of a double tank apparatus experimental set up. For this laboratory experiment, a World Wide Web interface was developed to assist students in assimilating control engineering concepts at the University of Melbourne.
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ItemPower formulations of input to state stability notions(IEEE, 2001-01-01)The characterizations of input-to-state stability (ISS) and integral input-to-state stability were presented. The characterizations were given in terms of powers of input and/or state signals and were novel compared to previous characterizations. The results showed that ISS systems possessed the property that bounded energy inputs implied bounded energy states.
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ItemA note on the robustness of input-to-state stability(IEEE, 2001)A unified framework was developed for studying robustness of the input-to-state stability (ISS) property. The results on robustness of ISS to slowly-varying parameters, to rapidly varying signals, and to generalized singular perturbations were presented. The results showed if the boundary layers and averaged systems were ISS then the ISS bounds hold for the actual system with an offset that converged to zero with the parameter that characterized the separation of time-scales.
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ItemInput-to-state stabilization for nonlinear sampled-data systems via approximate discrete-time plant models(IEEE, 2001)We provide a framework for the design of L∞ stabilizing controllers via approximate discrete-time models for sampled-data nonlinear systems with disturbances. In particular, we present sufficient conditions that guarantee that a discrete-time controller that input-to-state stabilizes an approximate discrete-time model of a nonlinear continuous-time plant with disturbances would also input-to-state stabilize (in an appropriate sense) the exact discrete-time plant model.
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ItemA trajectory based approach for stability robustness of systems with inputs(IEEE, 2001)We show, for a definition of semiglobal practical external stability, that the stability property holds on semi-infinite time intervals if and only if it holds on arbitrarily long but finite time intervals. These results have immediate applications in analysis of stability properties of highly oscillatory systems with inputs using averaging or for systems with inputs that are slowly varying. Results are stated for general flows and the stability is given with respect to arbitrary (not necessarily compact) sets.
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ItemBackstepping on the Euler approximate model for stabilization of sampled-data nonlinear systems(IEEE, 2001)Two integrator backstepping designs are presented for digitally controlled continuous-time plants in special form. The controller designs are based on the Euler approximate discrete-time model of the plant and the obtained control algorithms are novel. The two control laws yield, respectively, semiglobal-practical stabilization and global asymptotic stabilization of the Euler model. Both designs achieve semiglobal practical stabilization (in the sampling period that is regarded as a design parameter) of the closed loop sampled-data system. A simulation example illustrates that the obtained controllers may be superior to backstepping controllers based on the continuous-time plant model that are implemented digitally.
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ItemA note on preservation of dissipation inequalities under sampling: the dynamic feedback case(IEEE, 2001)We present a general and unified framework for the design of nonlinear digital controllers using the emulation method for nonlinear systems with disturbances. Several results on preservation of general dissipation inequalities under sampling are presented. We consider general dynamic feedback controllers case, which generalizes results for static controllers in [8].
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ItemA trajectory based approach for robustness of input-to-state stability(IEEE, 2001)A trajectory based approach for establishing input-to-state stability (ISS) with respect to arbitrary closed sets for parameterized families of systems is presented. Our results allow us to investigate ISS of time-varying systems with disturbances having partial averages and ISS of systems with disturbances that have slowly time-varying parameters in a unified manner.
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ItemChanging supply functions in ISS systems: The discrete time case(IEEE - Institute of Electrical and Electronic Engineers, 2001)We characterize possible supply rates for input-to-state stable discrete-time systems and provide results that allow some freedom in modifying the supply rates. In particular, we show that the results derived by Sontag and Teel (1995) for continuous-time systems are achievable for discrete-time systems.