134 構造物を伝播するガイド波成分の計測に基づく損傷検出

概要

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In this study, a damage identification method for beam structures by separating and extracting guided wave is investigated. Especially in this paper, a spatial-frequency reflection intensity map which effectively displays the reflectivity at a specific location and frequency on a spatial-frequency plane is proposed. From this map, one can figure out the location of a structural discontinuity such as boundaries and damages, and read out the reflectivity at the discontinuity of interest as a function of frequency. An analytical study reveals that the reflection characteristics in a specific inspection area between the sensor location and one boundary can be accurately estimated when the excitation force is acting only between the sensor location and the opposite boundary, and the excitation force acting inside the inspection area may harm the estimation of the reflectivity.
2009-08-03