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Acoustic Emission Detection and Source Location

| 2020:697 | Peter Ulriksen, Karim Haddad, Johanna Spåls
When under pressure, a building emits sound events related to mechanical changes in the structure. It is important to track and localise these structural changes, for the maintenance and the safety of the building.
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For this purpose, an array of microphones has been designed and developed by Doc. Peter Ulriksen from Lund University. The recorded signals have then been processed by Karim Haddad from Brüel & Kjær Sound & Vibration Measurement A/S. The processing consists in providing the localisation of a set of events.

The microphone array consists of 4 microphones arranged to locate an acoustic event in the 3D space. The processing is based on cross-correlations between pairs of microphones.

In total, 75 events have been analysed. A very large majority of localised events concern the top hemisphere above the position of the microphone array. A few numbers of events seem to be coming from the lower part, below the microphone array, but for these cases the results are less accurate.