According to theoretical predictions one can change the effective
stiffness or natural frequency of an elastic structure by
employing harmonic excitation of very high frequency. Here we
examine this effect for a hinged-hinged beam subjected to
longitudinal harmonic excitation. A simple analytical expression
is presented, that relates the effective natural frequencies of
the beam to the intensity of harmonic ex-citation. Experiments
performed with a laboratory beam confirm the general tendency of
this prediction, though there are discrepancies that cannot be
explained in the framework of the linear Galerkin-discretised beam
model.
| Publication status | Published - 1999 |
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