Stochastic stability analysis of a fractional viscoelastic plate excited by Gaussian white noise

Abstract

The fractional viscoelastic model arises naturally in the context of systems where integer order model does not match well with practical needs and finds wide applications in engineering reality. However, the research on stochastic dynamic characteristic of the fractional viscoelastic plate is still limited. In this paper, the stochastic stability of a fractional viscoelastic plate under Gaussian white noise is studied by determining the pth moment Lyapunov exponent. Firstly, by introducing the fractional Kelvin–Voigt model to represent the constitutive relation, the fractional stochastic dynamic equations with two degrees of freedom for the viscoelastic plate are established by piston theory and Galerkin approximate method. Thereafter, the first-order approximate analytic results of the pth moment Lyapunov exponent are calculated through utilizing the singular perturbation method, which agree well with the Monte Carlo simulations. Finally, the effects of noise, viscoelastic factors and system parameters on the stochastic stability of the fractional viscoelastic plate are investigated in detail. We show that the natural frequencies carry significant effects on the stochastic stability of the viscoelastic plate.