Piezoelectric wafer active sensor embedded ultrasonics in beams and plates |
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Authors: | V Giurgiutiu J Bao W Zhao |
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Institution: | (1) Department of Mechanical Engineering, University of South Carolina, 29208 Columbia, SC, USA |
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Abstract: | In this paper we present the results of a systematic theoretical and experimental investigation of the fundamental aspects
of using piezoelectric wafe active sensors (PWASs) to achieve embedded ultrasonics in thin-gage beam and plate structures.
This investigation opens the path for systematic application of PWASs forin situ health monitoring. After a comprehensive review of the literature, we present the principles of embedded PWASs and their
interaction with the host structure. We give a brief review of the Lamb wave principles with emphasis on the understanding
the particle motion wave speed/group velocity dispersion. Finite element modeling and experiments on thin-gage beam and plate
specimens are presented and analyzed. The axial (S
0) and flexural (A
0) wave propagation patterns are simulated and experimentally measured. The group-velocity dispersion curves are validated.
The use of the pulse-echo ultrasonic technique with embedded PWASs is illustrated using both finite element simulation and
experiments. The importance of using high-frequency waves optimally tuned to the sensor-structure interaction is demonstrated.
In conclusion, we discuss the extension of these results toin situ structural health monitoring using embedded ultrasonics. |
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Keywords: | Piezoelectric wafers piezoelectric sensors active sensors in situ diagnostics structural health monitoring piezoelectrics ultrasonics elastic waves P-waves S-waves shear waves axial waves flexural waves Rayleigh waves Lamb waves plate waves surface waves wave speed dispersion group velocity pulse-echo acousto ultrasonics |
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