AE Monitoring During Aircraft Flight Loading Conditions Fatigue Test

The technology of acoustic emission(AE) real time monitoring the critical structures (including inaccessible components) during aircraft flight loading conditions fatigue test was introduced. In a noise background due to severe shock and vibration, first of all, AE signals were pre-processed based on time filtering, amplitude filtering, and energy filtering as well as based on spatial filtering techniques. After acquiring the pre-processed AE signal, we adopted a new AE signal analysis principle that gave priority to AE diagnostic parameter trend analysis, multi-parameter analysis identifications and further looked for others(including waveform analysis) as assistant method. Real time monitoring of these critical structures was realized, and was successful in predicting a crack initiation in an interlayer of a bolt hole. The mean of AE monitoring played a key role for the fulfillment of the flight loading conditions fatigue test(FLCFT).