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Proceedings Paper

Lamb wave tuning curve calibration with improved PZT modeling
Author(s): Sang Jun Lee; Hoon Sohn
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Paper Abstract

Guided waves generated and measured using surface-bonded Lead Zirconate Titanate (PZT) transducers have been widely used for structural health monitoring (SHM) and nondestructive testing (NDT) applications. For selective actuation and sensing of Lamb wave modes, the sizes of the transducers and the driving frequency of the input waveform should be tuned. For this purpose, a theoretical Lamb wave tuning curve (LWTC) of a specific transducer size is generally obtained. Here, the LWTC plots each Lamb wave mode' amplitude as a function of the driving frequency. However, a discrepancy between experimental and existing theoretical LWTCs has been observed due to little consideration of the bonding layer and the energy distribution between Lamb wave modes. In this study, calibration techniques for the theoretical LWTCs are proposed. First, a theoretical LWTC is developed when circular shape of PZTs is used for both Lamb wave excitation and sensing. Then, the LWTC is calibrated by estimating the effective PZT size with PZT admittance measurement. Finally, the energy distributions among symmetric and antisymmetric modes are taken into account for better prediction of the relative amplitudes between Lamb wave modes. The effectiveness of the proposed calibration techniques is examined through numerical simulations and experimental estimation of the LWTC using the circular PZT transducers instrumented on an aluminum plate.

Paper Details

Date Published: 30 March 2009
PDF: 12 pages
Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72920M (30 March 2009); doi: 10.1117/12.815585
Show Author Affiliations
Sang Jun Lee, Carnegie Mellon Univ. (United States)
Hoon Sohn, Korea Advanced Institute of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 7292:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009
Masayoshi Tomizuka, Editor(s)

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