Abstract
Our contribution is devoted to a constructive overview of the implicit system approach in modern control of switched dynamic models. We study a class of non-stationary autonomous switched systems and formally establish the existence of solution. We next incorporate the implicit systems approach into our consideration. At the beginning of the contribution, we also develop a specific system example that is used for illustrations of various system aspects that we consider. Our research involves among others a deep examination of the reachability property in the framework of the implicit system framework that we propose. Based on this methodology, we finally propose a resulting robust control design for the switched systems under consideration and the proposed control strategy is implemented in the context of the illustrative example.
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Notes
- 1.
In the case where there is no output equation \(y = C x\), we simply write \(\varSigma ^{imp}(E, A, B)\).
- 2.
Geerts [18] considered the linear combinations of impulsive and smooth distributions, with \(\mu \) coordinates, denoted by \({\mathscr {C}}_{\mathrm {imp}}^{\mu }\), as the signal sets. The set \({\mathscr {C}}_{\mathrm {imp}}^{\mu }\) is a subalgebra and it can be decomposed as \({\mathscr {C}}_{\mathrm {p-imp}}^{\mu }\oplus \mathscr {C}_{\mathrm {sm}}^{\mu }\), where \({\mathscr {C}}_{\mathrm {p-imp}}^{\mu }\) and \({\mathscr {C}}_{\mathrm {sm}}^{\mu }\) denote the subalgebras of pure impulses and smooth distributions, respectively [41]. The unit element of this subalgebra is the Dirac delta distribution, \(\delta \). Any linear combination of \(\delta \) and its distributional derivatives \(\delta ^{(\ell )}\), \(\ell > 1\), is called impulsive.
- 3.
\(E{x_{0}}\) stands for \(E{x_{0}}\delta \), \({x_{0}}\in {\mathscr {X}}_{d}\) being the initial condition, and pE x stands for \(\delta ^{(1)}*E{x}\) (\(*\) denotes convolution); if pE x is smooth and \(E\dot{x}\) stands for the distribution that can be identified with the ordinary derivative, \(E{\mathrm {d}{x}}/{\mathrm {d}{t}}\), then \(pE{x} = E\dot{x} + E{x_{0^{+}}}\).
- 4.
- 5.
- 6.
- 7.
Since Theorem 7.5 is satisfied, one can also assign the output dynamics.
- 8.
This region is obtained from \(\det \left[ \begin{array}{ccc} {\mathrm {s}} &{} -1 &{} -1 \\ 0 &{} 0 &{} ({\mathrm {s}} + 1/{\tau })\\ \hline -{\alpha } &{} ({\beta }+2) &{} 1 \end{array}\right] = -(({\beta }+2){\mathrm {s}} - {\alpha })({\mathrm {s}} + 1/{\tau })\).
- 9.
This region is obtained following the methodology of [42], namely, we solve two Lyapunov equations for the two cases: (i) \(\beta \ne -2\) and (ii) \(\alpha \ne 0\) (with \(\beta =-2\)), with a common positive definite matrix P.
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Acknowledgements
This research was conducted in the framework of the regional programme “Atlanstic 2020, Research, Education and Innovation in Pays de la Loire”, supported by the French Region Pays de la Loire and the European Regional Development Fund.
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Bonilla Estrada, M., Malabre, M., Azhmyakov, V. (2020). Advances of Implicit Description Techniques in Modelling and Control of Switched Systems. In: Zattoni, E., Perdon, A., Conte, G. (eds) Structural Methods in the Study of Complex Systems. Lecture Notes in Control and Information Sciences, vol 482. Springer, Cham. https://doi.org/10.1007/978-3-030-18572-5_7
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