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(.):  nonlinear controlled object, tracking problems, parametric curve
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(.):  In Automatic theory are considered different tracking problems of given curve with the help of trajectory ( or its projection) of controlled object. These problems are essential for modern Control theory. In practice not always the desirable parametrtc curve can be realized by trajectory (or its projection) of controlled object. Therefore it is useful realize the desirable curve in approximate form with the help of given control object. Offen for solution of tracking problems it is used Stability theory. For example well-known theory of controlled stabilization, developed by N.N.Krasovsky and others authors, can be used for solution of a number of tracking problems. Also V.I.Zubov developed his approach for solution some tracking problems using Stability theory. In the paper we consider one problem of asymptotic tracking of given parametric curve. We consider some nonlinear controlled object. The dynamics of this object contains linear and nonlinear items. These nonlinear items play role of nonlinear disturbances of the linear control object. In the paper under sufficiently wide assumptions about nonlinear controlled object, some set of smooth parametric curves was builded. For curve from this set it is possible efficiently construct control function which realize asymptotic tracking for this curve. Notice that for constructing of tracking control function, we use compensation control, which compensates some nonlinear items. Notice that ideas of compensation of some nonlinear members were widely used in works of A.A.Kolesnikov, P.D. Krutko and others authors. One illustrative example was considered. In our paper we used Linear Control Theory and the Set-valued Analysis.

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