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: 2025
: .., .. // . - 2025. - . 113. - .95-119.
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(.): predefined performance, given input and output sets, control saturation, disturbance rejection, stability
: [3, 15] . . . , . , . , , , . , , .
(.): In [3, 15], a control method providing the nonlinear plant inputs and outputs in given sets is proposed. The main theorems of these studies are valid for SISO and MIMO systems with arbitrary relative degree. However, constructive algorithms for control law design are proposed for systems with unit relative degree only. In this study, the above-mentioned results are extended to a class of SISO systems with arbitrary relative degree and stable internal dynamics. For such a class of systems, a new control law providing the plant inputs and outputs in given sets is proposed that ensures compensation of both parametric uncertainty and exogeneous perturbation. In such a solution, the control signal boundedness is guaranteed explicitly by using a smooth nonlinearity in the control law, which prelimitly approximates the saturation function, and when the control signal amplitude is not enough to keep the system output in a given set, the proposed solution dynamically changes the given set for the system output, which allows one to avoid the feedback signal discontinuities. The theoretical results are validated via numerical experiments and can be applied, for example, to control position and Euler angles of solid bodies.
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