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Modeling of Acoustic Coupling of Ultrasonic Probes for High-Speed Rail Track Inspection

Mackiewicz Sławomir, Ranachowski Zbigniew, Katz Tomasz, Dębowski Tomasz, Starzyński Grzegorz, Ranachowski Przemysław

Archives of Acoustics

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2024

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Vol. 49, nr 2

255--266

EN

The paper presents the modeling of transmission of the ultrasonic plane wave through an uniform liquid layer. The considered sources of the ultrasonic wave were normal (straight) beam longitudinal wave probes and angle beam sheer waves probes commonly used in non-destructive testing. Coupling losses (CL) introduced by the presence of the coupling layer are discussed and determined applying the numerical procedure. The modeling applies to both monochromatic waves and short ultrasonic pulses with a specified frequency bandwidth. Model implementation and validation was performed using a specialized software. The predictions of the model were confirmed by coupling losses measurements for a normal beam longitudinal wave probe with a delay line made of polymethyl methacrylate (PMMA). The developed model can be useful in designing ultrasonic probes for high-speed rail track inspections, especially for establishing the optimal thickness of the water coupling layer and estimation of coupling losses, due to inevitable changes of the water gap during mobile rail inspection.

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Modelowanie wykrywania wad kontaktowo zmęczeniowych w szynach kolejowych metodą ultradźwiękową

Katz Tomasz

Badania Nieniszczące i Diagnostyka

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2023

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nr 1-4

17--24

PL

Celem niniejszego referatu jest przedstawienie sposobów modelowania wad kontaktowo-zmęczeniowych wykorzystując komercyjne i autorskie oprogramowanie komputerowe. Szczególną uwagę zwrócono na poznanie sposobu rozwoju wad kontaktowo-zmęczeniowych czego efektem jest po prawne modelowanie wad uwzględniające takie czynniki jak: lokalizacja wady, kierunek propagacji pęknięcia. Wynikiem końcowym prac było opracowanie parametrów serii głowic ultradźwiękowych, które będą efektywnie wykrywać wady kontaktowo-zmęczeniowe w szynach kolejowych.

EN

The purpose of this paper is to present ways of modelling a RCF (rolling contact fatigue) defects using commercial and proprietary computer software. Particular attention was paid to learning how RCF’s defects develop resulting in correct defect modeling taking into account such factors as defect location, crack propagation direction. The final result of the work was the development of parameters for a series of ultrasonic probes that will effectively detect RCF’s defects in railroad rails.

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Ultrasonic detection of transversal cracks in rail heads – theoretical approach

Katz Tomasz, Mackiewicz Sławomir, Ranachowski Zbigniew, Kowalewski Zbigniew L., Anatolik Łukasz

Engineering Transactions

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2021

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Vol. 69, iss. 4

437--456

EN

In the paper the calculation of ultrasonic field generated by the transmitting transducer and the pulse-echo amplitude received after beam reflection at the defect in tested material is presented. The focus of the authors is directed on the specific transducer – defect configurations where the common methods of determination of ultrasonic beam trajectory fails. The developed analytical model is based on well-established principles of elastodynamic theory and forms the basis for computer program for simulation of ultrasonic examination of railway rails.