Selecting Optimum Parameters of Ultrasonic Noncontact Shadow Method for Testing Products Made of Polymer Composite Materials

Kachanov, V. K.; Соколов, И. В.; Karavaev, M. A.; Kontsov, R. V.

doi:10.1134/s1061830920100046

Cited by 9 publications

(1 citation statement)

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“…A number of inconsistencies of the current track maintenance, violating the acoustic contact of the transducer with the rolling surface of the rail head were revealed in the remaining uncontrolled sections of track and bolted joints. Naturally, one of the ways to improve the reliability of control of rails is to replace distortion systems with piezoelectric transducers, requiring the presence of acoustic contact, to non-contact [11], but such systems during the ultrasonic control of rails in the track are not currently used.…”

Section: Introductionmentioning

confidence: 99%

Influence of speed of rail flaw detection on the reliability of its results

2023

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The system of non-destructive testing of rails during their operation on the railroad network of the Russian Federation is based on the use of removable and mobile means of flaw detection. The increase in the volume of control by mobile means in recent years is explained by their higher productivity due to the higher speed of control. But the increase in the speed of control inevitably leads to the loss of acoustic contact and missing defects.

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Section: Introductionmentioning

confidence: 99%

Influence of speed of rail flaw detection on the reliability of its results

2023

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Improving onset picking in ultrasonic testing by using a spectral entropy criterion

Bühling,

Maack

2024

The Journal of the Acoustical Society of America

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In ultrasonic testing, material and structural properties of a specimen can be derived from the time-of-flight (ToF). Using signal features, such as the first peak or envelope maximum, to calculate the ToF is error-prone in multipath arrangements or dispersive and attenuating materials, which is not the case for the signal onset. Borrowing from seismology, researchers used the Akaike information criterion (AIC) picker to automatically determine onset times. The most commonly used formulation, Maeda's AIC picker, is reassessed and found to be based on inappropriate assumptions for signals often used in ultrasonic testing and dependent on arbitrary parameters. Consequently, an onset picker for ultrasonic through-transmission measurements is proposed, based on a spectral entropy criterion (SEC) to model the signal using the AIC framework. This SEC picker takes into account the spectral properties of the ultrasonic signal and is virtually free of arbitrary parameters. Synthetic and experimental data are used to compare the performance of SEC and AIC pickers. It is shown that the accuracy of onset picking is improved for densely sampled data.

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