Christoph Kralovec, Martin Schagerl, Michael Mayr,
"Localization of damages by model-based evaluation of electro-mechanical impedance measurements"
: Proceedings of the 9th European Workshop on Structural Health Monitoring EWSHM, Serie The e-Journal of Nondestructive Testing, Vol. 23, 2018
Localization of damages by model-based evaluation of electro-mechanical impedance measurements
Sprache des Titels:
Proceedings of the 9th European Workshop on Structural Health Monitoring EWSHM
The electro-mechanical impedance method is a well-established structural health monitoring technique. The method evaluates the condition of a mechanical structure by the impedance frequency response of an attached and harmonically excited piezoelectric transducer. This contribution investigates the correlation of a damage?s distance to a transducer and the resulting change in the impedance frequency response for application to damage localization by means of triangulation. The investigated structure is a thin aluminum plate and magnets represent a moveable point mass, respectively a damage. Sole experimentally found correlations are compared with a model-based approach, which uses a FE model and thereby reduces the needed number of experiments to localize a damage at a certain accuracy and reliability. Finally, the influence of an over-determining piezoelectric transducer is analyzed regarding localization accuracy and reliability of the introduced model-based approach.