Passive extraction of Green's function of solids and application to high-speed rail inspection

Liang, Albert; Sternini, Simone; Capriotti, Margherita; Zhu, Peter C.; Scalea, Francesco Lanza di; Wilson, Robert L.

doi:10.1117/12.2514074

Cited by 1 publication

(3 citation statements)

References 6 publications

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“…2. Land-based systems [9,[50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67]-The employed equipment is placed on the ground near to the railway infrastructure, and its actuators and sensors are attached to the rails under test. The detection of defects in the rails is achieved through a pulse-echo approach.…”

Section: Systems For Rail Defect Detection Based On Ultrasonic Guided Waves: Classificationmentioning

confidence: 99%

“…In this case, as illustrated in Refs. [49,66], the sensing head is made of two receivers, denoted A and B, separated by a known distance; both are sensitive only to waves propagating unidirectionally (from left to right in Figure 13). The sensing head is mounted on a beam rigidly connected to the front-axle of the test car; similarly as in the active approach, contactless probing is employed.…”

Section: Hardware Configurationmentioning

confidence: 99%

“…The values evaluated for this duration are listed in Table 3. Additional work is in progress to quantify and improve the reliability of the defect detection prototype by (a) determining the optimal value of the threshold for the DI; (b) minimizing the effects of poor signal reconstruction; (c) improving the strength of the source excitation signal at low speeds [66].…”

Section: Performance Analysismentioning

confidence: 99%

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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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