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Development of theoretical and computational tools for the design of control strategies for nonlinear sampled-data systems

Abstract : This thesis is concerned with the sampled-data control of non-linear continuous-time systems. Sampled-data systems are present in all computer controlled, hybrid or embedded systems. The design and computation of suitable digital controllers represent unavoidable tasks since both continuous and discrete-time components interact. The basic framework of this work takes part of a wide research activity performed by S. Monaco and D. Normand-Cyrot regarding non-linear sampled-data systems. The underlying idea is to design digital controllers that recover certain continuous-time properties that are usually degraded through sampling as it is the case when continuous-time controllers are implemented by means of zero-order holder devices (emulated control). This thesis brings contributions into three different directions. The first one regards theoretical developments: a new digital backstepping-like strategy design for strict-feedback systems is proposed. This method is compared with other strategies proposed in the literature. The second contribution is the development of a control designer and of a simulation toolbox (in Matlab) for non-linear sampled-data systems. This toolbox includes different digital design strategies such as: multi-rate control, input-output/Lyapunov matching, digital backstepping design, etc. The third contribution concerns several case studies conducted to highlight the performances of the sampled-data controller designs, computed by the means of the software toolbox. Experimental and simulation results are described for various real examples especially in the area of electrical and mechanical processes.
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Submitted on : Wednesday, December 12, 2012 - 9:42:22 AM
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Valentin Tanasa. Development of theoretical and computational tools for the design of control strategies for nonlinear sampled-data systems. Other [cond-mat.other]. Université Paris Sud - Paris XI; Universitatea politehnica (Bucarest), 2012. English. ⟨NNT : 2012PA112300⟩. ⟨tel-00763971⟩

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