多重モードラム波からの単一モードの抽出と欠陥検出への応用

概要

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Lamb waves generally consist of many dispersive modes, which makes mode identification difficult. This study discribes the extraction of a single mode from multiple modes. The single mode extraction is based on two dimensional Fast Fourie Transform (2 D FFT) in time and space, signal filtering and 2 D inverse FFT. Air-coupled ultrasonic technique were adopted for non-contact fast measurements. Using this technique, the A 0 and S 0 modes were clearly detected in preliminary tests of intact plates. Furthermore, multiple reflections of the A 0 mode, which were shown only in the computer simulation, were experimentally confirmed in reflection tests of plates with a square notch. In the reflection tests, two reflected waves were extracted in the intervals corresponding to notch widths.
社団法人日本機械学会の論文
2001-12-25