Verification of digital twin concept for time reversal analysis

0519736 - ÚT 2020 RIV CZ eng A - Abstract
Kober, Jan - Mračko, Michal - Převorovský, Zdeněk
Verification of digital twin concept for time reversal analysis.
NDT in Progress 2019. Praha: Ústav termomechaniky AV ČR, v. v. i., 2019 - (Převorovský, Z.). s. 118. 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 * source reconstruction * FEM, model calibration
OECD category: Materials engineering

It has been shown experimentally, that it is possible to record signals of elastic wave propagation on a tested structure and perform time reversal focusing on an independent reference structure. Here the possibility of utilizing a numerical model – digital twin, as a reference structure is studied. An experiment was conducted on a strip of Al-alloy with known mechanical constants. In the first
step was the numerical model calibrated. A measurement of dispersive wave propagation was performed and compared with equivalent results of the numerical simulation. Material parameters
were adjusted accordingly and usable correlation length was determined. Once the model was calibrated, second experimental setup was tested. The experiment was conducted again with the
transducer placed in different location with different modality. A limited vibrometer scan was performed and the data were fed into the numerical model. Using time reversal it was possible to
localize the source and partially reconstruct the source function. Presented approach could be used for localization of impacts or acoustic emission sources and prospectively for damage detection and
sizing.
Permanent Link: http://hdl.handle.net/11104/0304944