Flaw Identification in Structures via Computationally Assisted NDT
The practice of Non-Destructive Testing (NDT) is applied in many different fields of engineering to detect the presence of flaws in structures without causing structural damage. Ultrasonic NDT is one such method: the tested specimen is subjected to an acoustic wave field and the reflected wave is measured and provides information on flaws contained in the specimen. A description of the physics involved may be found, for example, in .
The methodology of the NDT process as used routinely today in industry is described schematically in Fig. 1. An input signal is applied by the NDT system to the specimen surface; the resulting measurements are interpreted by a human technician in comparison with a reference signal obtained by a “perfect” specimen. By this method it is possible to detect the existence of a flaw of sufficient size and provide some very limited information on its location and size.
KeywordsGenetic Algorithm Inverse Problem Forward Problem Candidate Flaw True Inclusion
This work was supported in part by the Fund for the Promotion of Research at the Technion, by the Robert and Mildred Rosenthal Aerospace Engineering Research Fund and by the fund provided through the Lawrence and Marie Feldman Chair in Engineering of the second author.
- 3.Colton D, Kress R (1992) Inverse acoustic and electromagnetic scattering theory. Springer, BerlinGoogle Scholar
- 4.Ensminger D (1988) Ultrasonics. New YorkGoogle Scholar
- 5.Goldberg DE (1989) Genetic algorithms in search, optimization, and machine learning. Redwood City, CAGoogle Scholar
- 13.Tikhonov AN, Arsenin VY (1977) Solutions of ill-posed problems. Wiley, New YorkGoogle Scholar