4–6 Sept 2024
University of Salerno, Fisciano Campus - Buiding E1
Europe/Rome timezone

Conference Secretariat

Wave-based fault detection in concrete by the Full Waveform Inversion considering noise

5 Sept 2024, 11:15
15m
Room O (University of Salerno, Fisciano Campus - Building E1)

Room O

University of Salerno, Fisciano Campus - Building E1

Description

In the field of non-destructive testing of concrete, the use of ultrasonic waves became state of the art, among other techniques. Nevertheless, there is still room for improvement, in particular concerning resolution and robustness of the monitoring results.
One approach is the application of the Full Waveform Inversion (FWI) originating from geotechnical engineering, known here as seismic tomography. The forward and backpropagation of waves within a numerical model are deployed to identify material parameters, like the primary and secondary wave velocity as well as density. This approach forms a non-linear, and ill-posed mathematical problem. Its solution is computationally demanding and time-consuming.
Within the presented approach, the Full Waveform Inversion is used on an artificial concrete specimen. Here, the synthetic ultrasound data is compromised by the consideration of different levels of Gaussian white noise. Additionally, several sizes and positions of faults are computed to simulate a variety of possible defects within the concrete material as in reality. Subsequently, the identifiability of the fault together with its recognition quality are investigated. Additionally, recommendations on sensor positioning and layout are given.

Primary authors

Ina Reichert (Bauhaus-Universität Weimar, Germany) Tom Lahmer (Bauhaus-Universität Weimar, Germany)

Presentation materials

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