タイプIII複合蓄圧器を伝搬するアコースティックエミッション信号の分類手法の開発

抄録

Type III FRP pressure vessels were used in hydrogen stations because of lightweight and long lifetime. However, fatigue cracks occur due to repetitive charging and discharge of hydrogen. Therefore, nondestructive inspection technique is required in order to prevent an accident. In this study, we analyzed the AE signal propagating in Type III pressure vessels and we investigated the characteristics of Acoustic emission (AE) propagation as a function of AE source position. Pulse YAG laser was used as artificial AE source to simulate the damage of Type III pressure vessels. Wavelet transform of waveform detected by PZT sensor was carried out. When aluminum liner was used as a sound source, low frequency component of A₀ mode in aluminum was detected, while it was not seen the waveform packet of lamb wave of carbon fiber reinforced plastic (CFRP). From this result, the possibility of classifying whether the AE generating member is aluminum liner or CFRP was classified.