マハラノビス・タグチ法のAE波初動部同定への適用

抄録

Mahalanobis-Taguchi (MT) method was applied to determining the first arrival time of acoustic emission (AE) waves in order to conduct waveform analyses without the experiences of experts. The recorded waveform was divided into the segments and that the Mahalanobis distances from the reference space consisting the back-ground noises to each segment were evaluated for identification. The appearance of the meaningful signal for the analysis could be found by searching the segment which firstly loses the similarity to the reference space. It was demonstrated that MT method could easily determine the arrival time which is coincident with the time obtained by visual observation based on the experiment using the simulated AE waves. It was found that MT method is effective to determine the arrival time of AE waves with high accuracy and robust against for configuration of the parameter in comparison with the voltage threshold method which has been generally used.