Acoustic Emission (AE) monitoring can be used to detect the presence of damage as well\nas determine its location in Structural Health Monitoring (SHM) applications. Information\non the time difference of the signal generated by the damage event arriving at different\nsensors in an array is essential in performing localisation. Currently, this is determined\nusing a fixed threshold which is particularly prone to errors when not set to optimal\nvalues. This paper presents three new methods for determining the onset of AE signals\nwithout the need for a predetermined threshold. The performance of the techniques is\nevaluated using AE signals generated during fatigue crack growth and compared to the\nestablished Akaike Information Criterion (AIC) and fixed threshold methods. It was found\nthat the 1D location accuracy of the new methods was within the range of< ââ?¬â?? 1 7.1% of the\nmonitored region compared to 2.7% for the AIC method and a range of 1.8ââ?¬â??9.4% for the\nconventional Fixed Threshold method at different threshold levels.
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