Abstract
The paper presents a study of a possible application of structure embedded
piezoelectric actuators to enhance the performance of a rotating composite
beam exhibiting the coupled flexural-flexural vibrations. The discussed
transversal and lateral bending modal coupling results from the
directional properties of the beam's laminate and ply stacking
distribution. The mathematical model of the beam is based on an assumption
of cross-sectional non-deformability and it incorporates a number of
non-classical effects. The final 1-D governing equations of an active
composite beam include both orthotropic properties of the laminate and
transversely isotropic properties of piezoelectric layers. The system's
control capabilities resulting from embedded Macro Fiber Composite
piezoelectric actuators are represented by the boundary bending moment. To
enhance the dynamic properties of the composite specimen under
consideration a combination of linear proportional control strategies has
been used. Comparison studies have been performed, including the impact on
modal coupling magnitude and cross-over frequency shift.
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