Deconvolution of acoustic emissions for source localization using time reverse modeling

详细信息    查看全文

• 作者：Georg Karl Kocur^a ; ^b ; ^{georg.kocur@mechbau.uni-stuttgart.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Deconvolution ; Hertzian impact ; Acoustic emission ; Time reversal ; Elastic waves ; Wave propagation
• 刊名：Journal of Sound and Vibration
• 出版年：2017
• 出版时间：20 January 2017
• 年：2017
• 卷：387
• 期：Complete
• 页码：66-78
• 全文大小：3051 K

文摘

Impact experiments on small-scale slabs made of concrete and aluminum were carried out. Wave motion radiated from the epicenter of the impact was recorded as voltage signals by resonant piezoelectric transducers. Numerical simulations of the elastic wave propagation are performed to simulate the physical experiments. The Hertz theory of contact is applied to estimate the force impulse, which is subsequently used for the numerical simulation. Displacements at the transducer positions are calculated numerically. A deconvolution function is obtained by comparing the physical (voltage signal) and the numerical (calculated displacement) experiments. Acoustic emission signals due to pencil-lead breaks are recorded, deconvolved and applied for localization using time reverse modeling.