ABSTRAKT

For a controllable differential system uniform approximation of sliding modes was considered by means of trajectories generated by piecewice-constant controls. The conditions of solution uniqueness associated with each control were not imposed. Two discrete rules of extremal shift were investigated. It was shown that 1) by a discrete version of Kryazhimskii method one can approximate some trajectories of the bundle generated by the given generalized control; 2) there exist generalized trajectories which are not approximated by admissible trajectories; 3) if the controllable system satisfies the conditions of Kanke general uniqueness theorem, then any arbitrary sliding mode is approximated by Krasovskiy extremal shift rule.