Abstract
The objective of this chapter is to present a methodology for computing robust positively invariant sets for linear, discrete time-invariant systems that are affected by additive disturbances, with the particularity that these disturbances are subject to state-dependent bounds. The proposed methodology requires less restrictive assumptions compared to similar established techniques, while it provides the framework for determining the state-dependent (parameterized) ultimate bounds for several classes of disturbances. The added value of the proposed approach is illustrated by an optimization-based problem for detecting the mode of functioning of a switching system.
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- 1.
Often the notion of global boundedness is complemented by the attribute uniform to emphasize the possible dependence of the bound on the initial condition \(x_0\) but not on the initial moment in time. This addition is superfluous for time-invariant dynamics and will be abandoned here.
- 2.
The set S is a proper superset of \(\limsup _{k\rightarrow \infty }X_k\). The meaning of the outer limit (\(\limsup \)) is particular in this context as it is understood in a set-theoretic framework [2] as the set of cluster points of sequences \(x(x_0,\mathbf{w}^{0:k-1})\in X_k\).
- 3.
A function \(f:\mathbb {R}^n\rightarrow \mathbb {R}\) is radially unbounded if \(\Vert x\Vert \rightarrow \infty \implies f(x)\rightarrow \infty \).
- 4.
The unit ball is defined with respect to a predefined norm \(|.|_p\). In the present case the matrix \(B\in \mathbb {R}^{n\times 1}\) and thus the corresponding unit ball is defined in \(\mathbb {R}\) where the \(|.|_p\) are equivalent for \(p\in [1,\infty )\).
- 5.
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Acknowledgments
The results presented in this chapter were initiated in the framework of the French-Italian collaborative research project Galileo 2014. The authors would like to thank Prof. F. Blanchini, Prof. D. Casagrane, Prof. S. Miani, and G. Giordano for the fruitful discussion on the topic. This work was supported by the People Programme (Marie Curie Actions) of the European FP7 (2007–2013) under REA grant agreement n\(^{\circ }\) 626891 (FUTuRISM).
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Olaru, S., Reppa, V. (2015). Ultimate Bounds and Robust Invariant Sets for Linear Systems with State-Dependent Disturbances. In: Olaru, S., Grancharova, A., Lobo Pereira, F. (eds) Developments in Model-Based Optimization and Control. Lecture Notes in Control and Information Sciences, vol 464. Springer, Cham. https://doi.org/10.1007/978-3-319-26687-9_16
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