The Use of Correlation and Frequency Analysis for Detection of Deformation in 7050 Aluminum Beams

Abstract:

Lead zirconate titanate (PZT) is one of the most widely used ferroelectric and piezoelectric materials. Its piezoelectricity is widely used in the applications of structural health monitoring (SHM). Here, we use PZT ceramics as sensors to detect the deformation of structure using guided Lamb waves. In order to well analyze the multi-modes of Lamb waves and achieve detection of deformation in superposed wave peaks, correlation and Fourier transform were used to extract peaks in both time and frequency domain. In this paper, a 7050 aluminum beam and three-point bending test machine were utilized to test the changes of waves when different deformations were introduced. With the adjustment of correlation index, change of time delay and new peaks occurring in time domain demonstrated the change of deformations. In frequency domain, the change of central frequencies and magnitudes also demonstrated the change of deformations. The study shows the potential applications of PZT sensors in detection of deformation.

• Periodical: Key Engineering Materials (Volume 655)
• Pages: 263-266
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.655.263
• Online since: July 2015
• Authors: Fei Yi Liao, Shi Jun Li, Yuan Lin*
• Keywords: Correlation Analysis, Deformation Detection, Frequency Analysis, Lamb Waves

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