SHAPE IDENTIFICATION OF PIPE-WALL THINNING USING ELECTROMAGNETIC ACOUSTIC TRANSDUCER

摘要

In this paper, we propose a sizing methodology of pipe wall thinning using data acquisition by electromagnetic acoustic transducer (EMAT). First, a mathematical model of nondestructive test is given by eddy current systems and a linear elastic system. Secondly, an artificial corrosion is characterized by ellipsoid function with geometrical parameters. Thirdly, a parameter estimation problem is discussed using principle components analysis (POD). The proposed method deploys a reduced order model in order to save the computational cost of the forward analysis. Finally, an inverse analysis is performed for recovering corrosion shape using the measurement data.