Abstract
In order to detect damages in rotating components, a non-contact AE (Acoustic Emission) monitoring system was developed. The system was composed of an air-coupled ultrasonic sensor and a digitizer with a noise reduction function. Noise in the AE signal is reduced in real time by using a spectral subtraction method and ε-filter. The SN ratio of the AE signal was improved by approximately 11.8 dB. The developed system was next applied for monitoring bending fatigue in a rotating component. AE signals were detected at 90% or more to fatigue life and amplitude of AE signals increased with increasing the rotating cycle. Source of most AE signals was estimated that they were caused by contact of crack surface due to cyclic loading. However, some AE signals were generated by crack progression in other experiment.
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