超音波スペクトロスコピーによる欠陥と環境外乱の識別

概要

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Ultrasonic health monitoring of structures under realistic operating conditions is very difficult because ultrasonic waves are influenced by not only structural defects but also environmental disturbances. In this investigation, we examined the method of ultrasonic spectroscopy to classify the signal changes as "structural" or "experimental". Using aluminum plates, the ultrasonic propagation characteristics against the growth of defects (fatigue crack, slit and drilled hole) and the change in the environment disturbances (water drop, temperature and load) was investigated. The frequency dependency of both propagation delays and amplitudes of tone burst waves were different from each other for defects and environmental disturbances, and it was found that defects could be distinguished from the environmental disturbances by monitoring the delay-amplitude plot lines of the tone-burst waves with increasing frequency.
社団法人日本機械学会の論文
2006-02-25