Abstract
The main objective of this chapter is to understand the way in which periodic scheduling or hyper-sampling period and DCES-induced delays affect the stability of the controlled plant. Several scenarios are considered, leading to three stability problems. First, a delay-sweeping method is given in the case of constant parameters (hyper-sampling periods and DCES-induced delays). Next, two problems concerning the case when time-varying uncertain parameters are considered. For a system with time-varying uncertain parameters, a sufficient stability condition is given in terms of the existence of an appropriate Lyapunov matrix. The second problem concerns the stability of a real-time system including a constant hyper-sampling period and time-varying uncertain DCES-induced delays. In this case, sufficient conditions expressed in terms of feasibility of some appropriate linear matrix inequalities (LMIs) are proposed. Finally, the third problem concerns the case without DCES-induced delays but subject to time-varying uncertain hyper-sampling periods. The problem is handled by establishing an appropriate connection between the single-sampling and hyper-sampling cases. In this way, the hyper-sampling case appears as a direct application of the results derived in the single-sampling case. Next, a parameter-sweeping method is employed to detect the whole stability region in the corresponding parameter-space. Different examples (including also the case of two inverted pendulums) are given to illustrate the proposed results. It is worth mentioning that each system can be viewed as a switched system composed of “n” sub-systems if the hyper-sampling period has “n” sub-sampling periods. The derived stability regions include, in some cases, sub-regions where some sub-systems are not necessarily stable. This fact helps us to enlarge the stability ranges of the parameters by taking more advantage of the effect induced by the hyper-sampling period on the stability of the overall system. To the best of the authors’ knowledge, such an angle was not sufficiently addressed and exploited for real-time applications.
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Notes
- 1.
We have multiple lines to derive the stability condition. We may also consider “The asymptotic stability can be ensured if for any odd k and z(0)≠0 such that V(k+2)−V(k)<0”.
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Çela, A., Ben Gaid, M., Li, XG., Niculescu, SI. (2014). Stability of DCESs Under the Hyper-Sampling Mode. In: Optimal Design of Distributed Control and Embedded Systems. Communications and Control Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-02729-6_10
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DOI: https://doi.org/10.1007/978-3-319-02729-6_10
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