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Journal of Sensors
Volume 2016, Article ID 9507213, 15 pages
http://dx.doi.org/10.1155/2016/9507213
Research Article

A Novel Online Detection System for Wheelset Size in Railway Transportation

1State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China
2School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China
3Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada T6G 2R3
4School of Automation, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China
5School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

Received 10 February 2016; Revised 9 March 2016; Accepted 5 April 2016

Academic Editor: Rafael Morales

Copyright © 2016 Xiaoqing Cheng et al. 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.

Abstract

The online detection of wheelset size has important implications for ensuring the safety of railway operation and decreasing the maintenance costs. Based on laser displacement sensors (LDS), a novel online detection system of the wheel size is proposed using only six two-dimensional LDS and two one-dimensional LDS. The calculation principles of tread profile and wheel diameter are given, as well as the calibration method. Errors induced by wheel-rail vibration, misalignment, sensor noise, S-shape running, and wheelset differential are also analyzed. After system implementation, field experiments were performed using both standard wheel and several real trains. It turns out that the detection uncertainty of flange width and height is 0.1 mm and wheel diameter 0.3 mm, which can meet the requirements of maintenance.