Defect Indicators in a Rail Based on Ultrasound Generated by Laser Radiation

Teidj, Sara

doi:10.1016/j.promfg.2020.05.001

Procedia Manufacturing

2020

DOI: 10.1016/j.promfg.2020.05.001

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Defect Indicators in a Rail Based on Ultrasound Generated by Laser Radiation

Sara Teidj

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Cited by 3 publications

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“…The system output, after data analysis, is represented by the so-called damage index (DI), exhibiting peaks in correspondence of discontinuities (i.e., of potential defects) in rails. In recent years, the use of laser technology for both exciting UGWs in rails and sensing them has been investigated [68,69]. In this case, non-ablative laser sources are used to generate a guided tensional wave system in the rail; the response to such a system can be sensed by means of a rotational laser vibrometer.…”

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Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview

Bombarda

Vitetta

Ferrante³

2021

Applied Sciences

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Rail tracks undergo massive stresses that can affect their structural integrity and produce rail breakage. The last phenomenon represents a serious concern for railway management authorities, since it may cause derailments and, consequently, losses of rolling stock material and lives. Therefore, the activities of track maintenance and inspection are of paramount importance. In recent years, the use of various technologies for monitoring rails and the detection of their defects has been investigated; however, despite the important progresses in this field, substantial research efforts are still required to achieve higher scanning speeds and improve the reliability of diagnostic procedures. It is expected that, in the near future, an important role in track maintenance and inspection will be played by the ultrasonic guided wave technology. In this manuscript, its use in rail track monitoring is investigated in detail; moreover, both of the main strategies investigated in the technical literature are taken into consideration. The first strategy consists of the installation of the monitoring instrumentation on board a moving test vehicle that scans the track below while running. The second strategy, instead, is based on distributing the instrumentation throughout the entire rail network, so that continuous monitoring in quasi-real-time can be obtained. In our analysis of the proposed solutions, the prototypes and the employed methods are described.

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confidence: 99%

Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview

Bombarda

Vitetta

Ferrante³

2021

Applied Sciences

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Study of rail damage diagnosis and localization method based on intelligent wireless acoustic sensor network

Yang

Yin

2023

Measurement

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Laser ultrasonic nondestructive evaluation of sub-millimeter-level crack growth in the rail foot weld

et al. 2022

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Laser-generated ultrasonic wave characteristics in the rail foot weld were simulated and reported for qualitative analysis and evaluation of sub-millimeter-level crack growth. Numerical analyses using the finite element method (FEM), the propagation characteristics, and displacement field distribution of a laser-generated ultrasonic wave after the interaction with cracks were fully demonstrated. By calculating displacement amplitude distribution, the optimal sensing position and area were the laser incident point and the upper surface, respectively. Crack growth degree toward the rail bottom and axial direction can be confirmed by analyzing time and amplitude of the echoes originating from the rail bottom and crack surface reflection. By combining time with peak intensity of the echo reflection from the rail bottom, the sub-millimeter-level crack growth process inside the rail foot weld is capable of acquiring and evaluating. The results justify that the laser ultrasonic technique, characterized by laser excitation and laser detection, is a competitive nondestructive testing technique for sub-millimeter-level crack growth evaluation and detection inside the rail foot weld.

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Defect Indicators in a Rail Based on Ultrasound Generated by Laser Radiation

Cited by 3 publications

References 10 publications

Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview

Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview

Study of rail damage diagnosis and localization method based on intelligent wireless acoustic sensor network

Laser ultrasonic nondestructive evaluation of sub-millimeter-level crack growth in the rail foot weld

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