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Quantitative Inspection of Complex-Shaped Parts Based on Ice-Coupled Ultrasonic Full Waveform Inversion Technology
- Source :
- Applied Sciences, Vol 11, Iss 4433, p 4433 (2021), Applied Sciences, Volume 11, Issue 10
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- Ultrasonic methods have been extensively developed in nondestructive testing for various materials and components. However, accurately extracting quantitative information about defects still remains challenging, especially for complex structures. Although the immersion technique is commonly used for complex-shaped parts, the large mismatch of acoustic impedance between water and metal prevents effective ultrasonic transmission and leads to a low signal-to-noise ratio(SNR). In this paper, a quantitative imaging method is proposed for complex-shaped parts based on an ice-coupled full waveform inversion (FWI) method. Numerical experiments were carried out to quantitatively inspect the various defects in a turbine blade. Firstly, the k-space pseudospectral method was applied to simulate ice-coupled ultrasonic testing for the turbine blade. The recorded full wavefields were then applied for a frequency-domain FWI based on the Limited-memory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) method. With a carefully selected iterative number and frequency, a successive-frequency FWI can well detect half wavelength defects. Extended studies on an open notch with different orientations and multiple adjacent defects proved its capability to detect different types of defects. Finally, an uncertainty analysis was conducted with inaccurate initial velocity models with a relative error of ±2%, demonstrating its robustness even with a certain inaccuracy. This study demonstrates that the proposed method has a high potential to inspect complex-shaped structures with an excellent resolution.
- Subjects :
- Technology
full waveform inversion
Turbine blade
defect detection
QH301-705.5
Computer science
QC1-999
Acoustics
01 natural sciences
law.invention
law
Robustness (computer science)
Approximation error
Nondestructive testing
0103 physical sciences
General Materials Science
Biology (General)
QD1-999
010301 acoustics
Instrumentation
Uncertainty analysis
010302 applied physics
Fluid Flow and Transfer Processes
business.industry
Physics
Process Chemistry and Technology
Ultrasonic testing
General Engineering
Engineering (General). Civil engineering (General)
Computer Science Applications
ice-coupled ultrasonic testing
Chemistry
complex structure
Ultrasonic sensor
TA1-2040
Acoustic impedance
business
Subjects
Details
- ISSN :
- 20763417
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Applied Sciences
- Accession number :
- edsair.doi.dedup.....a254678ca8b53205126bb1325d27f620