The presented results show that GBS modeling yields reliable results at low computation times. The calculation times are tremendously lower as compared to other methods, which is particularly beneficial at higher frequencies, as of special interest in high resolution NDT of aero engine components. The Gaussian beam results are obtained instantaneously, while the point source superposition results are calculated within three to four minutes on a 3 GHz Intel Xeon PC. This speed-up in calculation time is particularly useful in performing transient calculations. The transient approach is also extremely fast, since it operates in time domain and preserves the computational effciency of the monochromatic approach. A sequence of 50 snapshots -as an example- has been calculated for a spatial discretisation of 200 by 200 points within less than 10 seconds. Differences of this 'pseudotransient' approach in comparison with a frequency domain approach exist in the near-field, since the near-field structure of the monochromatic beam field is conserved. However, relevant evaluations are mostly done in the far-field. Also, the GB module provides a fast apriori evaluation of an inspection situation, while more exact methods can be subsequently applied, if necessary. Finally, the effciency of Prony method in determining new sets of GB coeffcients is beneficial in view of setting up a data base for commercial/standard type transducers. Validation of the GBS approach has been performed with respect to NDT of aeroengine components.
Gaussian beam modeling for commercial transducers applied to aero engine disk inspection
Gaussbündelmodellierung für kommerzielle Wandler zum Einsatz bei der Prüfung von Flugzeug-Turbinenscheiben
2006
8 Seiten, 5 Bilder, 8 Quellen
Conference paper
Storage medium
English
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