NDLI: Improvements in Axle Box Acceleration Measurements for the Detection of Light Squats in Railway Infrastructure

Content Provider	IEEE Xplore Digital Library
Author	Zili Li Molodova, M. Nunez, A. Dollevoet, R.
Copyright Year	1982
Abstract	Squats are a type of short-wave rolling contact fatigue defect whose early detection can contribute to cost reductions in the railway industry. This paper demonstrates how the early detection of squats is possible via enhanced instrumentation based on axle box acceleration (ABA) and adequate postprocessing. Three improvements are discussed. The first corresponds to the use of longitudinal ABA to enhance measurement sensitivity to light squats. Compared to vertical ABA, longitudinal ABA does not contain the vibrations of the rail, fastening, sleepers, and ballast, and thus, the impact-related vibration is considerably stronger in the signal. The second improvement considers the use of multiple sensors, noise-reduction techniques, and repeated measurements. Due to hunting, the wheels of a measuring train do not always pass over small squats; thus, light squats are more likely to be detected using multiple sensors and multiple measurement runs. The third improvement concerns the signal-processing solution for the reduction of disturbances from wheel defects. Extensive field measurements show that these improvements make the characteristics of squats more visible in signals and allow the squats to be distinguished from vibrations of other origins.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	4385
Ending Page	4397
Page Count	13
File Size	3296292
File Format	PDF
ISSN	02780046
Volume Number	62
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wheels Vibrations Rail transportation Frequency measurement Axles Acceleration Sensors surface defects on railway rails Axle box acceleration (ABA) rail transportation maintenance railway monitoring
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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