Abstract
This article focuses on the positivity and the asymptotic stability of fractional-order linear time-delay systems (FOLTDSs) which are composed of N (N ≥ 2) subsystems. Firstly, a sufficient and necessary condition is given to ensure the positivity of FOLTDSs. The solutions of the studied systems are obtained by using the Laplace transform method, and it can be observed that the positivity of FOLTDSs is completely determined by the series of matrices and independent of the magnitude of time-delays. Secondly, a theorem is given to prove the asymptotic stability of positive FOLTDSs. By considering the monotonicity and asymptotic properties of systems with constant time-delay, it is further shown that the asymptotic stability of positive FOLTDSs is independent of the time-delay. Next, a state-feedback controller, whose gain matrix is derived by resolving a linear programming question, is designed such that the state variables of the systems are nonnegative and asymptotically convergent. When the order of the FOLTDSs is greater than one, by utilizing a proposed property of Caputo derivative, a sufficient condition for the positivity of FOLTDS is presented. Finally, simulation examples are presented to verify the validity and practicability of the theoretical analysis.
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This work was supported by the National Natural Science Foundation of China under Grant Nos. 61967001, 12062004, and 11771263, the Innovation Project of Guangxi University for Nationalities Graduate Education (gxun-chxps201908 and gxun-chxkc201903), and the Guangxi Natural Science Foundation (2019GXNS-FAA185007 and 2020GXNSFAA297240).
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Hao, Y., Huang, C., Cao, J. et al. Positivity and Stability of Fractional-Order Linear Time-Delay Systems. J Syst Sci Complex 35, 2181–2207 (2022). https://doi.org/10.1007/s11424-022-1018-7
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DOI: https://doi.org/10.1007/s11424-022-1018-7