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Robust soft variable structure control of perturbed singular systems with constrained input

Asadinia M. S., Binazadeh T.

Control and Cybernetics

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2017

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Vol. 46, no. 4

345--360

EN

This paper investigates the robust soft variable structure (RSVS) control technique for perturbed singular systems with constrained input control. The aim of the RSVS control law, in addition to achieving desirable control performance for the constrained input, is the robust stability of the closed-loop system in the presence of perturbation. In this paper, the RSVS control for perturbed singular systems is designed for two cases. First, it is assumed that the perturbation term vanishes at the origin. In this case, the proposed RSVS controller leads to asymptotic stabilization of the perturbed singular system. In the second case, the perturbed singular systems with non-vanishing perturbation are considered and the robustness of RSVS is also investigated. In this situation, the proposed controller guarantees practical stability of the perturbed singular system. Finally, computer simulations are provided for two examples to verify the theoretical results.

2

Extending Lyapunov redesign method for robust stabilization of non-aﬃne quadratic polynomial systems

Binazadeh T., Rahgoshay M.

Control and Cybernetics

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2016

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Vol. 45, no. 3

373--384

EN

The Lyapunov redesign method is basically used for robust stabilization of nonlinear systems with an aﬃne structure. In this paper, for the ﬁrst time, by suggestion of a simple but eﬀective idea, this approach is developed for robust stabilization of non-aﬃne quadratic polynomial systems in the presence of uncertainties and external disturbances. In the proposed method, according to the upper bound of an uncertain term, a quadratic polynomial is constructed and with respect to the position of the roots of this polynomial, the additional feedback law is designed for robustness of the quadratic polynomial system. The proposed technique is also used for robust stabilizing of a magnetic ball levitation system. When the coil current is the control input of the magnetic ball levitation system, equations of this system are increasingly nonlinear with respect to control input and have quadratic polynomial structure. The effectiveness of the proposed control law is also demonstrated through computer simulations.

3

A Bajocian (Middle Jurassic) marine gastropod assemblage from the Badamu Formation, Central Iran

Ferraris M., Binazadeh T., Kaim A.

Annales Societatis Geologorum Poloniae

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2016

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Vol. 86, No. 3

329--340

EN

Nine species of gastropods are reported from the Bajocian (Middle Jurassic) part of the Badamu Formation of Central Iran. This is the first report of a gastropod assemblage of this age from the shelves of the Kimmerian Continent. Seven species belong to the Vetigastropoda and two to the Caenogastropoda. Two new species, the pleurotomariid Bathrotomaria iranica sp. nov. and the eucyclid Eucycloidea badamuensis sp. nov., are described. The remaining species are left in open nomenclature owing to poor preservation. The composition of the gastropod association is strongly reminiscent of other Tethyan gastropod faunas, in particular those from the southern shores of the Tethys (India and Arabia) and from southern Europe. This indicates a relatively uniform distribution of gastropod faunas along the Middle Jurassic shores of the western Tethys.

4

Passivity-based optimal control of discrete-time nonlinear systems

Binazadeh T., Shafiei M. H.

Control and Cybernetics

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2013

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Vol. 42, no. 3

627--637

EN

In this paper, a passivity-based optimal controlmethod for a broad class of nonlinear discrete-time systems is proposed. The resulting control law is a static output feedback law which is practically preferred with respect to the state feedback law and is simple to implement. The control law has a general structure with adjustable parameters which are tuned, using an optimization method (genetic algorithm), to minimize an arbitrary cost function. By choosing this cost function it is possible to shape the transient response of the closed-loop system, as it is desirable. An illustrative ex ample shows the effectiveness of the proposed approach.