The nonlinear vibration analysis of a clamped-clamped beam by a reduced multibody method

Abstract

The nonlinear response characteristics for a dynamic system with a geometric nonlinearity is examined using a multibody dynamics method. The planar system is an initially straight clamped-clamped beam subject to high frequency excitation in the vicinity of its third natural mode. The model includes a pre-applied static axial load, linear bending stiffness and a cubic in-plane stretching force. Constrained flexibility is applied to a multibody method that lumps the beam into N elements for three substructures subjected to the nonlinear partial differential equation of motion and N -1 linear modal constraints. This procedure is verified by d'Alembert's principle and leads to a discrete form of Galerkin's method. A finite difference scheme models the elastic forces. The beam is tuned by the axial force to obtain fourth order internal resonance that demonstrates bimodal and trimodal responses in agreement with low and moderate excitation test results. The continuous Galerkin method is shown to generate results conflicting with the test and multibody method. A new checking function based on Gauss' principle of least constraint is applied to the beam to minimize modal constraint error.

Vibration of a Timoshenko beam supporting arbitrary large pre-deformation

“…Theoretical (e.g., [18,19]) and numerical (e.g., [20]) approaches may be performed to tackle the effect of pre-stress on the superimposed waves. The problem of finite displacement may be found for a large variety of application, too: from wind turbine [21] to musical instrument [22].…”

Influence of a finite strain on vibration of a bounded Timoshenko beam

“…Multibody dynamics combined with numerical method was used to analyze the nonlinear response of pre-compressed beam e.g. (Kovacs, 1996), but limited to low frequencies.…”