Application of image source method in time reversal of elastic waves

0519751 - ÚT 2020 RIV CZ eng A - Abstract
Zeman, Radovan - Kober, Jan - Chlada, Milan
Application of image source method in time reversal of elastic waves.
NDT in Progress 2019. Praha: Ústav termomechaniky AV ČR, v. v. i., 2019 - (Převorovský, Z.). s. 132-132. ISBN 978-80-87012-72-7.
[NDT in Progress 2019 /10./. 07.10.2019-10.10.2019, Praha]
R&D Projects: GA ČR(CZ) GA17-22615S
Institutional support: RVO:61388998
Keywords : time reversal * image source method * acoustic emission sources * minor focus
OECD category: Materials engineering

The paper deals with the Image Source Method (ISM) and the minor focuses within Time Reversal (TR). The ISM is presented, i.e. approach of construction of Green functions as a sequence of wave arrivals from the source to the given point through various paths, and their usage to simulate wave propagation in solids. The ISM is applied to simulate the process of TR in rectangular plate where the minor focuses are observed, and their properties are derived. Experiment is conducted in order to verify the simulated observations. A rectangular aluminium plate is equipped with a piezoelectric transducer and a vibrometer is used to measure velocities on its surface. One-channel time reversal and cross-correlation-based method using the direct propagation are performed. Occurrence of the minor focuses within experimental results prove derived properties to be correct.
Permanent Link: http://hdl.handle.net/11104/0304953