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S21 Vibrações e Análise Modal |
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Title:
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EXCITATION, PROPAGATION, AND DETECTION OF STRUCTURAL WAVES IN PIEZOELECTRIC COMPOSITE BEAMS
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Summary :
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A MODEL BASED ON REDDY S DISCRETE LAYERWISE LAMINATE THEORY IS EMPLOYED TO
SIMULATE THE HIGH-FREQUENCY (SHORT-WAVELENGTH) EXCITATION, PROPAGATION,
AND SENSING, OF STRUCTURAL WAVES IN COMPOSITES CONTAINING PIEZOELECTRIC
SENSORS AND ACTUATORS. COMPARISONS BETWEEN APPROXIMATE AND EXACT WAVE
DISPERSION SPECTRA ARE PERFORMED IN ORDER TO ASSESS THE EFFICIENCY OF THE
LAYERWISE THEORY IN THE HIGH-FREQUENCY RANGE. A STUDY OF THE PROPAGATION
OF GUIDED WAVES IN AN 11-PLY ARALL BEAM WITH BONDED PZT LAYERS IS REPORTED.
IT IS SHOWN THAT, BY EMPLOYING THE APPROPRIATE INTERPOLATION SCHEME, THE
APPROXIMATE MODEL IS CAPABLE OF REPRODUCING THE EXACT DISPERSION SPECTRUM
AT WAVELENGTH TO THICKNESS RATIOS AS LOW AS 0.25. FINALLY, RESULTS FROM SIMULATIONS OF THE BROAD-BAND, FREQUENCY RESPONSE OF AN ACTIVE ALUMINUM
BEAM WITH SIMULATED SURFACE BREAKING DEFECTS OF DIFFERENT DEPTHS ARE
PRESENTED AND COMPARED WITH DATA FROM SIMILAR EXPERIMENTS. |
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Author :
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Braga, Arthur M. B.
Gama, Antonio Lopes
Morikawa, Sergio R. K.
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Paper View :
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