access icon free Observer-based adaptive control of uncertain stochastic singular systems via integral sliding mode technique

This study is concerned with the problem of adaptive sliding mode control (SMC) for uncertain stochastic singular systems. A novel integral-type sliding surface function is first introduced based on a particular observer design, which incorporates both the state estimations and the outputs to achieve prescribed specifications. The analysis of mean-square asymptotic admissibility of the underlying sliding mode dynamics with disturbance attenuation level for the closed-loop systems is performed to exploit a new condition via linear matrix inequality technique. Then, the reachability of the predesigned sliding surface is ensured within finite-time almost surely by utilising a novel adaptive SMC law. Two examples are provided to demonstrate the validity and potential of the proposed method.

Inspec keywords: reachability analysis; closed loop systems; uncertain systems; stochastic systems; linear matrix inequalities; H∞ control; observers; variable structure systems; adaptive control

Other keywords: state estimation; observer-based adaptive H∞ control; integral-type sliding surface function; linear matrix inequality; sliding mode dynamics; adaptive uncertain stochastic singular systems; adaptive sliding mode control; integral sliding mode; mean-square asymptotic admissibility; closed-loop systems; observer design; sliding surface reachability; H∞ disturbance attenuation level; adaptive SMC law

Subjects: Combinatorial mathematics; Self-adjusting control systems; Algebra; Time-varying control systems; Simulation, modelling and identification; Optimal control; Multivariable control systems

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