City rail train wheel diameter detection method and system based on laser ranging

Abstract

The invention discloses a city rail train wheel diameter detection method and system based on laser ranging. The system comprises two sets of 2D laser displacement sensors mounted on the inner sides of tracks in the direction parallel to the extending direction of the tracks. Laser sources of the two sets of 2D laser displacement sensors and the upper surfaces of the tracks are located on the same plane. The two sets of 2D laser displacement sensors detect and obtain wheel tread contour lines, and coordinates of the sensors are transformed into the plane parallel to the inner end faces of train wheels through coordinate rotation transformation to obtain abscissas of the inner end faces of the train wheels, so that a filter window is established for filtering disturbance points of data; and data of tread points which are 70 mm away from the inner end faces of the train wheels are extracted, a set of collected data with the train wheel centers being located on the midperpendicular of the laser sources of the two sets of sensors is calculated through geometrical relationship and selected as calculating data, mounting parameters of the sensors are combined, and the train wheel diameters are obtained through the geometrical relationship. The system has the characteristics of being high in detection speed and measurement precision, simple in system structure, convenient to mount, capable of achieving online non-contact measurement and the like.

Description

technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to a method and system for detecting the wheel diameter of urban rail trains based on laser ranging. Background technique [0002] The wheels of urban rail trains carry the full load of the train. During the operation of the train, the treads are constantly worn and the diameter of the wheels is continuously reduced. to test. At the same time, due to the influence of the running line, the wear of the coaxial wheels is uneven. When the wheel diameters of the coaxial wheels differ greatly, the wear of the wheels will increase, which will affect the safe operation of the train and even endanger the lives of passengers. Therefore, it is very necessary to detect the diameter of the train wheel. [0003] The detection of wheel diameter has always been the focus of research on rail transit at home and abroad. For example, Li Zhaoxin introduced the laser wheel dynamic ...

AI Technical Summary

Problems solved by technology

For example, Li Zhaoxin introduced the laser wheel dynamic online detection system researched by OPTIMESS company in Switzerland in the document "Urban Rail Vehicle Wheelset Size Online Dynamic Detection System". This system uses multiple point laser sensors to measure the diameter of the wheel set, and the system cost is high. , complex structure installation

Domestic wheel diameter detection systems mainly include the LY series wheel set dynamic detection system developed by Chengdu Leading Technology Company, and the AUT-3500 wheel set size online detection system developed by Fudan Auto Company. Both of them use the image method to calculate the wheel diameter. Compared with the laser method, the measurement accuracy, stability and anti-interference ability of the system are at a disadvantage

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