• Assaad, Jamal
• Bahouth, Rudy
• Benmeddour, Farouk
• Moulin, Emmanuel

Abstract

Ultrasonic guided waves such as Lamb waves have been widely studied in Non- DestructiveTesting and Structural Health Monitoring applications for damage detection. Recently,the use of those waves in communication through solid metallic channels has gainedpopularity due to the huge need in some industrial sectors such as nuclear, railway,aerospace and smart vehicles. This paper aims to combine the concept of wirelesscommunication with the damage detection while using Lamb waves through healthy anddamaged aluminum plates with Symmetrical Notches. For this sake, the finite elementsoftware Elmer is used to simulate the propagation of guided waves in healthy anddamaged aluminum plates with symmetrical notches having depths varying from 1 to 5 mm.The concept of wireless communication using ultrasonic guided waves combined withdamage detection is launched based on two concepts. The first one is the modesseparation of the first wave-packet for S0 mode selection. The second one is the cross- correlation algorithm combined with Binary Phase Shift Keying modulation using only theS0 mode for the first binary digit. Experimental tests are carried out to validate thecombined communication and damage detection system. Experimental and simulated resultshave proven that the binary message is fully recovered simultaneously with thedetection of symmetrical notches. The detection is represented as a linear drop in thesimilarity percentage while increasing the damage depth while reaching a bit rate of200 kbits/s.

Topics

• impedance spectroscopy
• phase
• aluminium
• ultrasonic