THIN PLATE LAMB PROPAGATION RULE AND DISPERSION CURVE DRAWING BASED ON WAVE THEORY

Meng Yanyu and Yan Shi
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Meng Yanyu: College of Transportation and Civil Engineering, Beihua University, Jilin, Jilin 132013, P. R. China
Yan Shi: #x2020;School of Civil Engineering, Shenyang Jianzhu University, Shenyang, Liaoning 110168, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 07, 1-14

Abstract: Based on the wave theory and propagation characteristics of Lamb wave in the thin plate, Lamb wave is excited by signal actuator in the thin plate and signal sensor is received in real time. Employing the superior features of dispersion curve produced the Lamb wave and combining the dichotomy iterative principle with MATLAB tools to solve Lamb wave dispersion equation, the propagation characteristics of the Lamb wave in the thin plate are plotted. It is verified that the excited Lamb wave has multimode characteristics in a certain thickness, and the different modes are related to the frequency-thickness. The wavelength-thickness ratio is defined to simplify the calculation and provide convenience for the frequency bandwidth interception of Lamb wave. The results of the theoretical analysis show that the propagation multimode of Lamb and the distribution characteristics of dispersion curve can effectively simulate the transmission information of damage signal-excited thin plate, and identify damage region and determine the damage degree by S0 and A0 mode. The experimental results indicate that the established method to determine damage degree of thin plate attached PZT transducers based on Lamb wave active monitoring technology can achieve a certain precision, and can make a rough quantitative recognition of damage position.

Keywords: Lamb wave; wave theory; dispersion curve; wavelength-thickness; damage detection (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18502220

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