Abstract
This paper presents experimental observation of nonlinear vibrations in
the response of a flexible cantilever beam to transverse harmonic base
excitations around its flexural mode frequencies. In the experimental
setup, instead of manual control of the signal excitation frequency and
amplitude, a closed-loop vibration system is used to keep the excitation
amplitude constant during the frequency sweep and to increase confidence
in the experimental results. The experimental results show the presence of
the third mode in the response when varying the excitation frequency
around the fourth mode. The frequency-response curves, response spectrum
and Poincaré plots were used for characterization of nonlinear dynamic
behaviour of the beam.
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