On the stochastic response of a fractionally-damped Duffing oscillator. (English) Zbl 1417.74024
Summary: A numerical method is presented to compute the response of a viscoelastic Duffing oscillator with fractional derivative damping, subjected to a stochastic input. The key idea involves an appropriate discretization of the fractional derivative, based on a preliminary change of variable, that allows to approximate the original system by an equivalent system with additional degrees of freedom, the number of which depends on the discretization of the fractional derivative. Unlike the original system that, due to the presence of the fractional derivative, is governed by non-ordinary differential equations, the equivalent system is governed by ordinary differential equations that can be readily handled by standard integration methods such as the Runge – Kutta method. In this manner, a significant reduction of computational effort is achieved with respect to the classical solution methods, where the fractional derivative is reverted to a Grunwald-Letnikov series expansion and numerical integration methods are applied in incremental form. The method applies for fractional damping of arbitrary order \(\alpha (0 < \alpha < 1)\) and yields very satisfactory results. With respect to its applications, it is worth remarking that the method may be considered for evaluating the dynamic response of a structural system under stochastic excitations such as earthquake and wind, or of a motorcycle equipped with viscoelastic devices on a stochastic road ground profile.
MSC:
| 74S60 | Stochastic and other probabilistic methods applied to problems in solid mechanics |
| 74D05 | Linear constitutive equations for materials with memory |
| 65L05 | Numerical methods for initial value problems involving ordinary differential equations |
| 26A33 | Fractional derivatives and integrals |
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