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概要

The aim of this work presented here is to demonstrate the way to identify the shape of pipe-wall-thinning in straight pipe. First, the database is developed to obtain approximate solution of waves reflected from pipe-wall-thinning with three-dimensional guided wave simulator and proper orthogonal decomposition (POD). In particular, we show that the database can be used to efficiently approximate the solutions to the guided wave propagation problem. Second, the inverse problem procedure is introduced to estimate the parameters characterizing the pipe-wall-thinning according to the comparison of the each approximate signal and the detected signal. The parameters are axial length, radial depth, and circumferential width of the pipe-wallthinning. Finally, issues concerning the implementation of the method and numerical calculations are discussed. Numerical result shows that our method is applicable for three-dimensional shape identification with ultrasonic guided wave.

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