Simple attempt to compensate temperature variation in structural health monitoring system using Lamb wave inspection

Lázaro Valentim Donadon¹; Leonardo de Paula Silva Ferreira¹; Horácio Valadares Duarte¹; Eduardo Bauzer Medeiros¹

¹ UFMG

doi:10.20906/CPS/COB-2015-0638

Resumo

The temperature variation during the performance of a Structural Health Monitoring using Lamb wave inspection can lead to false positives due to differences in between base line and the verification. In order to avoid the false positive, this work shows a simple technique to correct the experimental data to eliminate the false positive under the temperature variation. The proposed technique was tested in a square composite plate using Lamb wave inspection based in two inspection methods the first method is based on the construction of the wave propagation map calculated using the group velocity of the wave propagation and the Hilbert Transform. The second method is based on the comparison of the Power Spectrum Density of the signal measured by the sensors

Palavras-chave: Structural Health Monitoring; Structural Integrity; Damage Detection