Lamb wave wireless communication through healthy and damaged channels with symmetrical and asymmetrical steps and notches

Archive ouverte : Article de revue

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

Edité par HAL CCSD ; Institute of Electrical and Electronics Engineers

International audience. Data transmission through solid metallic channels is recommended in certain industries where no other options are proposed, such as nuclear, aerospace and smart vehicles. In addition to Faraday shielding effect of electromagnetic waves, another issue related to damage presence due to mechanical loads exists. A severe damage in the transmission channel leads to signal loss at the receiver. For this sake, ultrasonic guided waves, such as Lamb waves, may be a good substitute since they can propagate through long distances in solid metallic structures. The scope of this work is to build a reliable, reproducible and high data rate wireless communication experimental platform, using ultrasonic guided waves, through healthy and damaged plates for industrial usage. The target is to compensate at first the effect of dispersion, reverberation, scattering and boundary reflections for the healthy plate. The novelty of this work falls within the performance analysis of the demodulation algorithm based on cross-correlation combined with Binary Phase Shift Keying, using a finite element simulation through healthy and damaged plates with different depth of symmetrical and asymmetrical notches and steps based on the bit error percentage. Furthermore, another contribution related to the impact of multiple reflections and mode conversions caused by symmetrical and asymmetrical steps and notches, are taken into account. After this, numerical results are validated using an ultrasonic guided wave experimental platform. Results based on bit error percentage analysis proves that the algorithm has successfully compensated the effect of dispersion and boundary reflections for the healthy plate, and multiple reflections and mode conversions for the damaged ones. High effective data rate up to 350 kbits/s can be reached even in the presence of a severe damage in the transmission channel.

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