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Subharmonic parametric resonance of simply supported buckled beams

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Abstract

This study presents the nonlinear vibrations of simply supported beams that are subjected to a subharmonic resonance excitation of order two. The applied axial force has a static component to buckle the beam and a dynamic component for parametric excitation. The equation governing the nonlinear transverse deformations is an integral partial differential equation. The static counter part of the governing equation represents the nonlinear buckling problem that is solved for the critical buckling loads and exact buckled configurations. A reduced-order model based on the Galerkin’s discretization is obtained where a multi-mode discretization is assumed. The significance of the number of modes retained in the discretization is examined. It is found out that for simply supported beams, the second and higher modes have no contribution on either the static or the dynamic response of the beam. To study the nonlinear dynamics of the problem, a shooting method is used to locate periodic orbits and long-time numerical integration using fifth-order Runge–Kutta method is used to find the fast Fourier transforms of the response. A forward sweep, where the amplitude of the force is increased, while the frequency is kept fixed, is used to drive the beam. We find local attractors coexisting with snapthrough motion. Nonlinear instabilities such as period-doubling leading to chaos, symmetry-breaking, cyclic-fold, period-demultiplying, and jumping are reported. A bifurcation diagram showing all possible attractors near and far from the equilibrium positions is presented. This diagram is a helpful tool to design beams for a desired response especially for energy harvesting applications where high-amplitude vibration is needed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, United Arab Emirates University, P.O. Box 15551, Al Ain, United Arab Emirates

    Samir A. Emam

  2. Aerospace Structures and Materials, Faculty of Aerospace Engineering, TU Delft, 2600 GB, Delft, The Netherlands

    Mostafa M. Abdalla

Authors
  1. Samir A. Emam
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  2. Mostafa M. Abdalla
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Correspondence to Samir A. Emam.

Additional information

Samir A. Emam is on leave from Department of Mechanical Design and Production, Faculty of Engineering, Zagazig University, Zagazig, 44519, Egypt.

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Emam, S.A., Abdalla, M.M. Subharmonic parametric resonance of simply supported buckled beams. Nonlinear Dyn 79, 1443–1456 (2015). https://doi.org/10.1007/s11071-014-1752-z

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