Subcritical parametric dynamics of microbeams

Mergen H. Ghayesh*, Hamed Farokhi, Gursel Alici

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


The aim of this paper is to analyse the size-dependent nonlinear parametric dynamics of microbeams; the source of parametric excitation is a time-dependent longitudinal excitation load. Taking into account small-size effects, via the modified couple stress theory, the expressions for the potential and kinetic energies of the system are developed. A multi-degree-of-freedom discretised system is obtained by transforming the continuous model into a reduced-order one via the Galerkin scheme. For the system in the subcritical mean axial load regime, the parametric response is obtained via two different numerical techniques; first one is based on a continuation technique and the second one is via a direct time-integration method. A stability analysis is also conducted via the Floquet theory. Results for the nonlinear parametric response are illustrated in the form of parametric frequency-response diagrams, parametric force-response curves, time histories, phase-plane portraits, fast Fourier transforms (FFTs), and Poincaré maps. The effect of taking into account the length-scale parameter on the parametric response of the system is also highlighted.

Original languageEnglish
Article number2664
Pages (from-to)36-48
Number of pages13
JournalInternational Journal of Engineering Science
Early online date7 Jul 2015
Publication statusPublished - 1 Oct 2015


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