A constructive approach for investigating the stability of incommensurate fractional differential systems
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910523443904512 |
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| author | Diethelm, Kai Hashemishahraki, Safoura Thai, Ha Duc Tuan, Hoang The |
| author_facet | Diethelm, Kai Hashemishahraki, Safoura Thai, Ha Duc Tuan, Hoang The |
| contents | This paper is devoted to studying the asymptotic behaviour of solutions to generalized non-commensurate fractional systems. To this end, we first consider fractional systems with rational orders and introduce a criterion that is necessary and sufficient to ensure the stability of such systems. Next, from the fractional-order pseudospectrum definition proposed by Šanca et al., we formulate the concept of a rational approximation for the fractional spectrum of a noncommensurate fractional systems with general, not necessarily rational, orders. Our first important new contribution is to show the equivalence between the fractional spectrum of a noncommensurate linear system and its rational approximation. With this result in hand, we use ideas developed in our earlier work to demonstrate the stability of an equilibrium point to nonlinear systems in arbitrary finite-dimensional spaces. A second novel aspect of our work is the fact that the approach is constructive. Finally, we give numerical simulations to illustrate the merit of the proposed theoretical results. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2312_00017 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A constructive approach for investigating the stability of incommensurate fractional differential systems Diethelm, Kai Hashemishahraki, Safoura Thai, Ha Duc Tuan, Hoang The Numerical Analysis Dynamical Systems 34A08, 34D20 (Primary) 26A33, 34C11, 45A05, 45D05, 45M05, 45M10 (Secondary) This paper is devoted to studying the asymptotic behaviour of solutions to generalized non-commensurate fractional systems. To this end, we first consider fractional systems with rational orders and introduce a criterion that is necessary and sufficient to ensure the stability of such systems. Next, from the fractional-order pseudospectrum definition proposed by Šanca et al., we formulate the concept of a rational approximation for the fractional spectrum of a noncommensurate fractional systems with general, not necessarily rational, orders. Our first important new contribution is to show the equivalence between the fractional spectrum of a noncommensurate linear system and its rational approximation. With this result in hand, we use ideas developed in our earlier work to demonstrate the stability of an equilibrium point to nonlinear systems in arbitrary finite-dimensional spaces. A second novel aspect of our work is the fact that the approach is constructive. Finally, we give numerical simulations to illustrate the merit of the proposed theoretical results. |
| title | A constructive approach for investigating the stability of incommensurate fractional differential systems |
| topic | Numerical Analysis Dynamical Systems 34A08, 34D20 (Primary) 26A33, 34C11, 45A05, 45D05, 45M05, 45M10 (Secondary) |
| url | https://arxiv.org/abs/2312.00017 |