Online detection method for diameters of wheels of urban rail vehicle based on laser displacement sensors

Abstract

The invention discloses an online detection method for the diameters of wheels of an urban rail vehicle based on laser displacement sensors. The online detection method comprises the following steps: sequentially arranging a first laser displacement sensor, a second laser displacement sensor and a third laser displacement sensor on the inner side of a rail along the movement direction of a vehicle; setting a fourth laser displacement sensor on the outer side of the rail to be symmetrical to the third laser displacement sensor; carrying out coordinate conversion on detection point coordinates obtained by simultaneously detecting the wheels by the four laser displacement sensors; fusing the detection data, subjected to the coordinate conversion, of the third laser displacement sensor and the fourth laser displacement sensor on the same coordinate system to obtain a complete tread contour line; extracting a right end face of a tread according to the data subjected to the coordinate conversion and determining a transverse coordinate of the right end face of the tread; and after carrying out segmentation fitting on a tread curve, extracting tread standard point coordinates measured by the first laser displacement sensor, the second laser displacement sensor and the third laser displacement sensor respectively according to the transverse coordinate value of the right end face of the tread and obtaining the diameters of the wheels. According to the online detection method, structure arrangement is convenient, a system is stable and a measurement principle is simple; and high-precision online non-contact type measurement can be carried out.

Description

technical field [0001] The invention belongs to the technical field of railway wheel detection, in particular to an on-line detection method for urban rail vehicle wheel diameter based on a laser displacement sensor. Background technique [0002] The quality of the wheel set is crucial to the safety of train operation, and the dimensions of the wheel set are an important indicator to measure the technical status of the wheel set. After the wheelset of the train has been in operation for a period of time, the wheelset should be overhauled according to the relevant requirements. In the maintenance, it is very important to detect the geometric dimensions and position accuracy of the wheel set. Whether the detection data is accurate or not is directly related to the quality of the wheel set's maintenance and assembly and the safety of the train. Therefore, the on-line detection of the size of the wheel set has become an important basis for ensuring the safe operation of the tra...

AI Technical Summary

Problems solved by technology

Both of them realize the automatic measurement of the geometric parameters of the wheel set, but the system structure is complex, susceptible to environmental interference, and the accuracy of repeated measurement is low

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