Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))
Online ISSN : 2185-4661
ISSN-L : 2185-4661
Journal of Applied Mechanics Vol.21 (Special Feature)
APPLICATION OF ELASTIC SCATTERING AMPLITUDE TO PARTICLE FILTER FOR ESTIMATION OF FLAW SIZE AND LOCATION
Kazuyuki NAKAHATAAtsushi TSUJITAKazunori FUJISAWAAkira MURAKAMI
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2018 Volume 74 Issue 2 Pages I_75-I_84

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Abstract

For a sophistication of ultrasonic testing, the particle filter (PF) was applied to the estimation of size and location of a defect in a solid. In the PF, particles express the probability distribution of a state variable. The particle distribution is updated while merging measured data and simulation data, then the convergence of the particles indicates a plausible state variable. When the state variable to be identified increases, the use of a large number of particles are required. This leads to the cost escalation in numerical simulation. To enhance the accuracy of the PF as well as reduce the computational cost, we considered the introduction of the scattering amplitude. According to the theory of a time-shift invariant system, the scattering amplitude was extracted from an ultrasonic scattered signal from a defect, and then applied at the likelihood calculation. As the numerical simulation tool, we adopted the elastodynamic finite integration technique accelerated by a graphic processing unit calculation. The proposed PF approach was investigated in the ultrasonic measurement, and it was shown that the size and position of a side-drilled hole in an aluminum specimen was identified with a small number of particles.

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© 2018 by Japan Society of Civil Engineers
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