Wavelet解析を用いた異常診断システムの開発

概要

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This study is related with an approach for the diagnosis of defects or peculiar on structures using hammeringtest that is one of the non-destruction inspection methods of the structure. In this paper, the detection method of thedefects as a non-destruction inspection method has been suggested and the efficiency of the diagnosis method based onthe hammering sounds has been estimated in a simple structure model, an aluminum bar with free end. According tothe simulation by FEM model, it became obvious that the natural frequencies for the relating vibration mode of thealuminum bar decrease when the crack is at the abdomen of the vibration mode. On the contrary, the naturalfrequencies may not be changed or the change may be small when the crack is at near the nodes of natural vibrationmode. The diagnosis of the existence of the defect was done from the correlation of the Wavelet coefficient betweenthe two sound signals from aluminum bar without and with crack. The rough position of the crack is estimated from therelationship among the natural frequencies.
2011-01-31