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動的面外せん断歪みの共分散行列にもとづく非破壊検査手法の提案

発表形態：
一般講演（学術講演を含む）
主要業績：
主要業績
単著・共著：
共著
発表年月：
2010年12月
DOI：
会議属性：
国内会議
査読：
無し
リンク情報：

日本語フィールド

著者：
寺本 顕武,　井上 亮二 読み: テラモト　ケンブ,　イノウエ　リョウジ
題名：
動的面外せん断歪みの共分散行列にもとづく非破壊検査手法の提案
発表情報：
第２９回計測自動制御学会九州支部学術講演会講演論文集 ページ: 263-266
キーワード：
Spatio-temporal gradient analysis, Array signal processing, Lamb-wave, Non-destructive testing
概要：
抄録：
The use of Lamb waves has recently been interested in the non-destructive inspections for thin-plate-like structures. The conventional time-of-flight technique is not reliable for locating the defects even in isotropic plates because of the dispersiveness in the Lamb wave propagation. Avoiding difficulties caused by the dispersiveness, this paper proposes a novel spatio-temporal gradient imaging method which has an ability to localize cracks and to reconstruct the near-field imges of cracks. The proposed imaging method utilizes the detarminant of covariance matrix of dynamic shear strains which are defined over the object surface. The detarminant denotes the distribution of correlated intensity modulation of the incident wave fronts with scattered ones. In this study, the computational process in the wave field near the defects is discussed and their physical meanings are investigated through FDTD-simulations and acoustic experiments.

英語フィールド

Author：
Kenbu Teramoto, Ryoji Inoue
Title：
Announcement information:
Page: 263-266
Keyword：
Spatio-temporal gradient analysis, Array signal processing, Lamb-wave, Non-destructive testing
An abstract：
The use of Lamb waves has recently been interested in the non-destructive inspections for thin-plate-like structures. The conventional time-of-flight technique is not reliable for locating the defects even in isotropic plates because of the dispersiveness in the Lamb wave propagation. Avoiding difficulties caused by the dispersiveness, this paper proposes a novel spatio-temporal gradient imaging method which has an ability to localize cracks and to reconstruct the near-field imges of cracks. The proposed imaging method utilizes the detarminant of covariance matrix of dynamic shear strains which are defined over the object surface. The detarminant denotes the distribution of correlated intensity modulation of the incident wave fronts with scattered ones. In this study, the computational process in the wave field near the defects is discussed and their physical meanings are investigated through FDTD-simulations and acoustic experiments.

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