Portable train wheel normal section contour structured light vision measurement system and method

Abstract

The invention discloses a portable train wheel normal section contour structured light vision measurement system and method. According to the method, a multi-line structured light vision sensor reconstructs general contours of train wheels at different visual angles, the general contours are rotated around an axis and projected to an axis passing plane, so that a normal section contour is obtained, and the complete normal section contour of the train wheels can be obtained by splicing measurement results at the multiple visual angles. The invention provides a train wheel normal section profilemeasurement method which is not constrained by the position and attitude of a sensor. The method has the characteristics of high measurement precision, high operation flexibility, high automation degree, strong robustness and the like.

Description

technical field [0001] The invention relates to the field of railway detection and measurement, in particular to a method for measuring the contour line of the front section of a train wheel. Background technique [0002] The train wheel is an important part of the railway transportation system. Measuring the front section contour of the train wheel can determine the wear condition of the wheel and the key geometric parameters of the wheel, so as to replace and repair the wheel that has reached the wear limit in time, thus providing an important guarantee for the safety of railway traffic. . [0003] At present, the measurement methods for the front section contour of train wheels are mainly divided into contact and non-contact methods. The contact measurement method uses the sensor sensitive element to directly contact the wheel surface to obtain the three-dimensional information of the front section profile of the wheel. LIJ-4D and MiniProf are typical contact measuremen...

AI Technical Summary

Problems solved by technology

However, this method of assisting the positioning of sensor poses with the help of landmarks is affected by the limitations of pasting landmarks, the operation is complex, the efficiency is low, and it is not suitable for large-scale application scenarios.

[0004] To sum up, at present, the method of measuring the front profile of a train wheel based on structured light needs to constrain the pose of the wheel or the sensor to achieve the purpose of measuring the profile line of the front section. The main disadvantage is that the measurement accuracy is affected by the installation accuracy of the sensor. Limited viewing angle, incomplete measured profile, poor operational flexibility, etc.

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