Flange size measurement based on laser displacement sensor

 

 

SU Zhaoyi1, ZHANG Haiqiang1, XING Zongyi2, WANG Xiaohao2

 

(1. Guangzhou Metro Corporation, Guangzhou 510335, China;

 

2. School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China)

 

 

Abstract: Aiming at solving problems such as increasing flange wear of urban rail vehicles and low accuracy of manual measurement, an online noncontact measuring method of flange size based on 2D laser displacement sensor was proposed. Firstly, the functions and importance of the flange height and width for urban rail vehicle wheels were introduced. Then, a measurement method of flange size was proposed. The 2D laser displacement sensors installed on both sides of the track were used to collect the tread data. Techniques including tread data segment, data preprocessing, coordinate transformation data fusion and so on were applied to process the output data to obtain the tread profile line. The flange size can be calculated by tread geometric relationship. Finally, the field experiments were conducted and the obtained results show that the error of the proposed method is below 0.2mm and has higher consistency than manual measurement. The proposed measurement can meet the requirements of measurement of flange size.

 

Key words: urban rail train; flange size; noncontact measurement