The G^α -scheme for Approximation of Fractional Derivatives: Application to the Dynamics of Dissipative Systems
Résumé
The Gear scheme is a three-level step algorithm, backward in time and second order accurate, for the approximation of classical time derivatives. In this article, the formal power of this scheme is used to approximate fractional derivative operators, in the context of finite difference methods. Numerical examples are presented and analyzed, in order to show the accuracy of the Gear scheme at the power 1 (G1-scheme) when compared to the classical Grnwald-Letnikov approximation. In particular, the combined G1 -Newmark scheme is shown to be second-order accurate for a fractional damped oscillator problem.
Domaines
Mécanique [physics.med-ph]Origine | Fichiers produits par l'(les) auteur(s) |
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