632 ウェーブレット解析を用いた復元力特性を有する構造物の累積損傷推定手法の実験的研究

概要

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The authors have proposed the health monitoring system by using wavelet transform of response as a method evaluating the safety of structures quantitatively. This system can detect the abnormal signal that occurred in progress of the low cycle fatigue of structure under noisy condition. The wavelet transform provides the multi-resolution analysis and the frequency information locally in time in contrast to the conventional Fourier transform. In this study, the experiment using a simple structural model is carried out. Input motion is sinusoidal excitation. The discontinuity, which should be produced at the point changing from the elastic region to the plastic region in restoring force, is detected by wavelet analysis of acceleration response. Especially, the relation of ductility factor and velocity at yield point, relation of wavelet coefficient and velocity at yield point and so on are discussed.
一般社団法人日本機械学会の論文
2000-09-01