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Session: 05-01: Guided Waves I
Paper Number: 97567
97567 - Numerical Application of Guided Wave Tomography Based on Full Waveform Inversion for a Pipe Bend
Pipe bends are well known hot spots for wall thinning as a consequence of the sudden change
in the fluid flow direction and velocity. Existing monitoring techniques for bends rely on local point-by-point thickness ultrasonic measurements, which are time-consuming compared with permanently installed transducers under the realm of Guided Wave Tomography (GWT). GWT enables to locate and quantify damages of a bounded area by processing the waves excited and received by a set of transducer arrays. In this work, a GWT method based on Full Waveform Inversion (FWI) is applied for a high-resolution thickness reconstruction of a steel pipe bend. The complex bend domain is replaced by a two-dimensional domain, which is made artificially anisotropic by using Thomsen parameters. The inversion was performed on a smooth 30% thickness reduction defect, and the influence of the defect position and the number of replicas on the reconstruction accuracy was investigated. A 220 mm diameter (d) pipe bend with 1.5d bend radius was modelled. The results suggest that the FWI method is capable to reconstruct the thickness map of smooth-defects independently of their location, and higher number of replicas increase the accuracy of the method, particularly for defects located closer to the intrados position.
Presenting Author: Carlos Omar Rasgado Moreno Tallinn University of Technology
Numerical Application of Guided Wave Tomography Based on Full Waveform Inversion for a Pipe Bend