Recent researches are here


The following researches were already finished and published.

Quantitative Non-Destructive Evaluation

A nondestructive technique using ultrasonic wave to estimate conditions of materials and damage states is called " ultrasonic testing(UT)". For the quantitative nondestructive evaluation, 1) Development of forward analyses to predict ultrasonic wave in target material, 2) Development of inverse analyses to reconstruct flaw shapes, 3)Development of real time and on-site NDE tools with user-friendly interface, are necessary.




1) Development of forward analyses to predict ultrasonic wave in target material
We were making numerical simulation tools to predict ultrasonic propagation and scattering in solid and fluid. Here we were applying the boundary element method(BEM) and the Fast Multipole BEM to the numerical simulation.


Fig: Modeling of phased array transducer and simulation of ultrasonic wave propagation using the BEM.


Fig: Predicted flaw echoes from internal crack with rough surfaces using the fast multipole BEM.


2) Development of inverse analyses to reconstruct flaw shapes
In the UT, estimations of flaw shapes and material properties are carried out. These can be modeled and formulated as inverse scattering problems. We were proposing new flaw imaging techniques based on elastic and acoustic wave theories.

Fig: Numerical simulations of flaw reconstructions by the inverse scattering imaging method(ISIM)


3)Development of real time and on-site NDE tools with user-friendly interface
We were focusing on real time UT tools which can be used on site. The following figure shows time-harmonic wave field in a pipe, which is generated by an angle-beam transducer. This technique is based on the Multi-Gaussian beam modeling. Using this technique, we can easily and rapidly estimate beam profiles in a target material.




* Above researches were already finished. If you want our papers related to above researches, feel free to ask us.


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