Siberian Federal University

Issue

Journal of Siberian Federal University. Engineering & Technologies. 2019 12 (8)

Authors

Potylitsyn, Vadim S.; Kudinov, Danil S.; Kokhonkova, Ekaterina A.

Contact information

Potylitsyn, Vadim S.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Kudinov, Danil S.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia; Kokhonkova, Ekaterina A.: Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia;

Keywords

radar; flaw detector; rail; free oscillations; frequency shift

Abstract

Currently, the problem of non-destructive testing of rail lashes or rolling stock is quite acute, as the demands of both speed characteristics and vehicle safety increase every year. Thus, the purpose of this study was to determine the possibility of recording frequencies of natural oscillations by the radar method for rail lashes and the influence of the dimensions of the cavity-type defect. For this purpose, a laboratory bench was created with a standard rail, the length of 1.19 m of the P-65 brand, in which free oscillations were excited using a shock impulse load. Measurements of natural oscillation frequencies of the rail were recorded on a 24-bit ADC and a specialized accelerometer ZETLAB BC110. To register the oscillations, a Doppler radar with a frequency of 10 GHz was used, which was installed at the focus of a parabolic mirror offset antenna with a 1.6-meter diameter. It was found that a “field” defect shifts the frequency mode of oscillation 750 Hz upwards. It is shown that the hole in the rail neck with a diameter of 10 mm makes a change in the frequency of about 14 Hz

Pages

1006-1012

DOI

10.17516/1999-494X-0201

Paper at repository of SibFU

https://elib.sfu-kras.ru/handle/2311/128391

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).