講演抄録/キーワード |
講演名 |
2008-09-25 15:00
二層型圧電振動子を用いたLamb波の発生と非破壊検査への一応用 ○福田 誠・今野和彦(秋田大) US2008-35 |
抄録 |
(和) |
逆分極に貼り合わせた二層型圧電振動子を用いて,閉じた亀裂を作成したガラス板に有限振幅のLamb波を発生させ,閉じた亀裂で生じた2次高調波を検出した.その結果,閉じた亀裂からの反射波中に含まれる2次高調波は,亀裂のない部分からの反射波と比較して,約15dBだけ多く検出された.また,同分極に貼り合わせた二層型圧電振動子を用いて,同様の実験を行い,閉じた亀裂から生じる分調波成分の検出を試みた.その結果,閉じた亀裂からの反射波に含まれる分調波は,亀裂のない部分からの分調波と比較して,約5dBだけ多く検出された.以上のように,二層型圧電振動子を用いることで反射法による非線形なLamb波の非破壊検査への利用の有効性を示すことができた. |
(英) |
Lamb waves of finite amplitude are generated in a glass plate having closed cracks by using a double-layered piezoelectric transducer (DLPT) in opposing polarization direction, and second harmonic components generating from closed crack are detected by DLPT. As the results, second harmonic components including the waves reflected from closed crack area are increased by approximately 15 dB compared with these from no-crack area. Furthermore, Lamb waves of finite amplitude are generated in a glass plate having closed cracks by using a DLPT in aligning polarization direction, and subharmonic components generating from closed crack are also detected by DLPT. As the results, subharmonic components including the waves reflected from closed crack area are increased by approximately 5 dB compared with these from no-crack area. Usefulness of nonlinearity of Lamb wave for the nondestructive evaluation (NDE) in a pulse-echo method using DLPT is demonstrated. |
キーワード |
(和) |
Lamb波 / 2次高調波 / 分調波 / 閉じた亀裂 / 二層型圧電振動子 / / / |
(英) |
Lamb wave / Second Harmonic / Subharmonic / Closed crack / Double-Layered Piezoelectric Transducer / / / |
文献情報 |
信学技報, vol. 108, no. 212, US2008-35, pp. 19-24, 2008年9月. |
資料番号 |
US2008-35 |
発行日 |
2008-09-18 (US) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します.(許諾番号:10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
PDFダウンロード |
US2008-35 |