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Sensors 2016, 16(4), 564; doi:10.3390/s16040564

Dynamic Measurement for the Diameter of A Train Wheel Based on Structured-Light Vision

Key Laboratory of Precision Opto-Mechatronics Technology, Ministry of Education, Beihang University, No. 37 Xueyuan Road, Haidian District, 100191 Beijing, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 2 March 2016 / Revised: 14 April 2016 / Accepted: 15 April 2016 / Published: 20 April 2016
(This article belongs to the Section Physical Sensors)


Wheels are very important for the safety of a train. The diameter of the wheel is a significant parameter that needs regular inspection. Traditional methods only use the contact points of the wheel tread to fit the rolling round. However, the wheel tread is easily influenced by peeling or scraping. Meanwhile, the circle fitting algorithm is sensitive to noise when only three points are used. This paper proposes a dynamic measurement method based on structured-light vision. The axle of the wheelset and the tread are both employed. The center of the rolling round is determined by the axle rather than the tread only. Then, the diameter is calculated using the center and the contact points together. Simulations are performed to help design the layout of the sensors, and the influences of different noise sources are also analyzed. Static and field experiments are both performed, and the results show it to be quite stable and accurate. View Full-Text
Keywords: train wheel diameter; dynamic measurement; structured-light vision; machine vision train wheel diameter; dynamic measurement; structured-light vision; machine vision

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Gong, Z.; Sun, J.; Zhang, G. Dynamic Measurement for the Diameter of A Train Wheel Based on Structured-Light Vision. Sensors 2016, 16, 564.

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