TY - JOUR

T1 - Dynamic Correction of Sensitivity of Flaw Detection Channels in High-Speed Rail Inspection

AU - Markov, A. A.

AU - Maksimova, E. A.

AU - Antipov, A. G.

N1 - Funding Information: We are grateful to Dr. Darrick Balu (Harvard Medical School, McLean Hospital) for his valuable discussion and critical suggestions. A.U. and A.d.B. are supported by a grant from Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR, Progetto PRIN 2017—Project no. 2017M42834). A.U., A.B., and F.E. have been recipients of grants from the Brain and Behavior Research Foundation (2013 NARSAD Independent Investigator Grant no. 20353 to A.U. and A.B., respectively; 2015 NARSAD Young Investigator Grant no. 23968 to F.E.). Tissue specimens were obtained from the Human Brain and Spinal Fluid Resource Center, VA West Los Angeles Healthcare Center, Los Angeles, CA 90073, which is sponsored by NINDS/NIMH, National Multiple Sclerosis Society, and Department of Veterans Affairs. Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

PY - 2021/12

Y1 - 2021/12

N2 - Abstract: An increase in the reliability of high-speed ultrasonic testing of elongated objects, in particular, railroad rails, is considered. It is shown that the current regulatory documents do not take into account the features of high-speed testing of rails, are focused on compliance with the initially specified parameters, and cannot provide the required reliability of defect detection. The factors that appear at high scanning speeds and negatively affect the quality of testing are considered. Most of these factors cannot be quantified to account for them and appropriately adjust testing parameters. The possible under rejection of defects when working in accordance with the current requirements has been assessed. To ensure more reliable testing in unpredictable and dynamic conditions of high scanning speeds, it is proposed to evaluate the current testing sensitivity by analyzing signals from typical structural reflectors of the test object. When inspecting rails, it is possible to use typical holes in the area of bolted joints that are regularly encountered along the scanning path as such reflectors. An expression is obtained for determining the magnitude of the correction of testing sensitivity taking into account the scanning speed and the measured parameters of the signals from the holes. An algorithm for dynamic correction of the testing sensitivity is proposed that increases the reliability of defect detection under high-speed scanning conditions.

AB - Abstract: An increase in the reliability of high-speed ultrasonic testing of elongated objects, in particular, railroad rails, is considered. It is shown that the current regulatory documents do not take into account the features of high-speed testing of rails, are focused on compliance with the initially specified parameters, and cannot provide the required reliability of defect detection. The factors that appear at high scanning speeds and negatively affect the quality of testing are considered. Most of these factors cannot be quantified to account for them and appropriately adjust testing parameters. The possible under rejection of defects when working in accordance with the current requirements has been assessed. To ensure more reliable testing in unpredictable and dynamic conditions of high scanning speeds, it is proposed to evaluate the current testing sensitivity by analyzing signals from typical structural reflectors of the test object. When inspecting rails, it is possible to use typical holes in the area of bolted joints that are regularly encountered along the scanning path as such reflectors. An expression is obtained for determining the magnitude of the correction of testing sensitivity taking into account the scanning speed and the measured parameters of the signals from the holes. An algorithm for dynamic correction of the testing sensitivity is proposed that increases the reliability of defect detection under high-speed scanning conditions.

KW - bolt holes

KW - dynamic correction

KW - high-speed testing

KW - negative factors

KW - nominal defect dimensions

KW - rail flaw detection

KW - sensitivity

UR - http://www.scopus.com/inward/record.url?scp=85125539224&partnerID=8YFLogxK

U2 - 10.1134/S1061830921120068

DO - 10.1134/S1061830921120068

M3 - Article

AN - SCOPUS:85125539224

VL - 57

SP - 1039

EP - 1049

JO - Russian Journal of Nondestructive Testing

JF - Russian Journal of Nondestructive Testing

SN - 1061-8309

IS - 12

ER -