J042011 空中伝播超音波センサとリアルタイム雑音低減手法を用いた非接触型AE計測システムの開発([J04201]超音波計測・解析法の新展開(1))

概要

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Acoustic emission (AE) technique is widely used for health monitoring of machines. However, it is difficult to monitor structural components that has rough surface or that is under operating. In order to monitor these components, non-contact AE monitoring system with noise reduction function was developed. The developed system was composed of an air-coupled ultrasonic transducer and a digitizer with a real-time noise reduction function. Two types of digital signal processing for improving signal to noise ratio were embedded in the system. One is a spectral subtraction process for reduction of continuous noise. The other is E-filter process which filters out pulse-like noise. Artificial AE signals were monitored to compare the performances between conventional AE system and developed one. The S/N ratio of the AE signal was improved by 12.3 dB by the developed system.
一般社団法人日本機械学会の論文
2011-09-11