Computer Vision Based Method and System for Online Measurement of Geometric Parameters of Train Wheel Sets

Sensors

Zhi-Feng Zhang³  Zhan Gao¹  Yuan-Yuan Liu²  Feng-Chun Jiang³  Yan-Li Yang³  Yu-Fen Ren³  Hong-Jun Yang³  Kun Yang³ 

[1] Key Laboratory of Luminescence and Optical Information of Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China; E-Mail:;Library of Zhengzhou University of Light Industry, Zhengzhou, 450002, China; E-Mail:;Department of Physics, Zhengzhou University of Light Industry, Zhengzhou, 450002, China; E-Mails:

关键词: wheel set;    calibration;    computer vision;    optoelectronic technique;    mapping function method;   

DOI  :  10.3390/s120100334

来源: mdpi

【 摘 要 】

Train wheel sets must be periodically inspected for possible or actual premature failures and it is very significant to record the wear history for the full life of utilization of wheel sets. This means that an online measuring system could be of great benefit to overall process control. An online non-contact method for measuring a wheel set’s geometric parameters based on the opto-electronic measuring technique is presented in this paper. A charge coupled device (CCD) camera with a selected optical lens and a frame grabber was used to capture the image of the light profile of the wheel set illuminated by a linear laser. The analogue signals of the image were transformed into corresponding digital grey level values. The ‘mapping function method’ is used to transform an image pixel coordinate to a space coordinate. The images of wheel sets were captured when the train passed through the measuring system. The rim inside thickness and flange thickness were measured and analyzed. The spatial resolution of the whole image capturing system is about 0.33 mm. Theoretic and experimental results show that the online measurement system based on computer vision can meet wheel set measurement requirements.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland