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Research on Merging Signal Processing Based on Mode Separation for PZT Performance

Y. ZHU, T. MU, C. HE


To solve the piezoelectric sensors’ mode merging issue in the harsh environmental, this paper has studied a method to obtain the single mode Lamb wave through dual excitation by using both theoretical analysis and experimental verification. Firstly, the theoretical analysis method has been used to build the coupling dynamic model between the plate and the piezoelectric material, furthermore, the propagating model of dual excitation Lamb wave in the plate has been provided too. A Lamb wave signal of pure S0 mode and A0 mode, excited by in-phase and outof- phase signal, has been obtained through theoretical study. Then, an experimental system for single mode Lamb wave has been set up. Piezoelectric sensors have been symmetrically mounted on the same location of the plate. Where a high-precision approach has been designed and set up to locate precisely (On-axis accuracy is 5 micrometers), and the same force has been exerted on the two piezoelectric sensors and the glue thickness was the same. All solutions are very important to get a pure mode sigal. 5 periods’ sine wave modulated by Hanning-window has been applied as the excitation signal, and PZT-5 as the piezoelectric stimulation source, pure S0 and A0 mode waves have been separated with in-phase and out-of-phase excitation, the problem of the mode merging signal has been solved. It’s useful to test piezoelectric sensor performance in harsh enviroment.

doi: 10.12783/SHM2015/363

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