日本機械学会論文集C編
Online ISSN : 1884-8354
ISSN-L : 1884-8354
一般論文
インパクトハンマ加振を受けるはりにおける非線形波動変調現象に基づく損傷位置の推定
田中 昂増田 新曽根 彰
著者情報
ジャーナル フリー

2013 年 79 巻 801 号 p. 1594-1601

詳細
抄録

This paper concerns the estimation method of damage location based on the nonlinear wave modulation demodulation which has attracted much attention in the field of structural health monitoring. When a structure containing a contact-type damage is subjected to a low-frequency vibration, a high-frequency wave which propagates through the damage may undergo amplitude and phase modulation at the damage location because the scatter characteristics of high-frequency waves in the vicinity of the damage may fluctuate in synchronization with the low-frequency vibration because of the contact acoustic nonlinearity. Since this modulation propagates through the structure with the group velocity, it may be possible to estimte damage location by measuring the modulation and performing an inverse analysis based on the wave propagation model. In this paper, a mathematical model of the modulation propagation on a Timoshenko beam is constructed, and by considering the damage as a source of the modulation, an estimation algorithm of damage location which utilizes the time difference between the modulated waves measured by sensor arrays located at both sides of the damage is proposed, and examined experimentally.

著者関連情報
© 2013 一般社団法人 日本機械学会
前の記事 次の記事
feedback
Top