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29 July 2004 Modeling of piezoelectric-based Lamb wave generation and sensing for structural health monitoring
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Among the various schemes being considered for Structural Health Monitoring (SHM), Lamb-wave testing has shown great promise. While Lamb-wave testing using hand-held transducers for Non Destructive Evaluation (NDE) is a well-established technology, Lamb-wave testing for SHM using surface-bonded/embedded piezos is a relatively new field. Little effort has been made towards a precise characterization of Lamb-wave excitation using piezos and often the various parameters involved are chosen without mathematical foundation. In this work, modeling of transient plane and circular-crested Lamb-wave generation and sensing using surface-bonded piezos in isotropic plates based on the 3-D linear elasticity equations is explored. Equations for the output voltage response of surface-bonded piezo-sensors in Lamb-wave fields are presented and optimization of the actuator/sensor geometry and materials is done based on those. Finally, numerical and experimental results to examine the validity of these models are discussed.
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Ajay Raghavan and Carlos E. S. Cesnik "Modeling of piezoelectric-based Lamb wave generation and sensing for structural health monitoring", Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004);

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