Numerical or approximate methods are currently developed, but they do not fulfill the same requirements. If models are used for research and engineering studies (optimal transducer design, study of new configurations, complex data analysis ... ), their intensive use is sought. Only approximate models offer the necessary high computing performances.
For several years, ultrasonic modeling at the French Atomic Energy Commission (CEA) is based onto continuous developments of two user-friendly models adapted to industrial applications and leading to accurate quantitative predictions in short computations times. Champ-Sons predicts fields radiated by arbitrary transducers. Mephisto predicts echostructures arising from defects and piece boundaries and uses fields computed by Champ-Sons as input data. Predictions are displayed using the very same imaging tools as for experimental data, thanks to the CIVA system designed for imaging and processing data from different NDT techniques.
We will recall the principles of the two models and present their most recent extensions, e.g., design of Fermat's transducer, video-like display of ultrasonic field snapshots, field calculations in anisotropic media, prediction of the echo-structure from defects of irregular shape or involving Rayleigh wave generation and scattering.
Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00
Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:
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