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This work presents a concept for the localisation of Lamb waves using aPassive Phased Array (PPA). A Warped Frequency Transformation (WFT) is appliedto the acquired signals using numerically determined phase velocity informationto compensate for signal dispersion. Whilst powerful, uncertainty betweenmaterial properties cannot completely remove dispersion and hence the closeintra-element spacing of the array is leveraged to allow for the assumptionthat each acquired signal is a scaled, translated, and noised copy of itsadjacent counterparts. Following this, a recursive signal-averaging methodusing artificial time-locking to denoise the acquired signals by assuming thepresence of non-correlated, zero mean noise is applied. Unlike the applicationof bandpass filters, the signal-averaging method does not remove potentiallyuseful frequency components. The proposed methodology is compared against abandpass filtered approach through a parametric study. A further discussion ismade regarding applications and future developments of this technique.

Passive Phased Array Acoustic Emission Localisation via Recursive Signal-Averaged Lamb Waves with an Applied Warped Frequency Transformation