Dynamic measurement method and system for train wheel diameter

Abstract

The invention discloses a dynamic measurement method for train wheel diameter. The dynamic measurement method comprises the following steps of: symmetrically arranging line-structured light vision sensors along a train track and acquiring light bar images of fracture surface contours of a train wheel and an axle; determining an inner side surface equation of a rim through the light bar of the fracture surface contour of the wheel and a straight segment corresponding to the inner side of the rim, determining an axis equation of the axle through the light bar of the fracture surface contour of the axle, and calculating projection coordinates of the inner side surface of the center of a vertex circle of a wheel flange through the intersection of the axis and the inner side surface of the rim; calculating the diameter of the vertex circle of the wheel flange through projection coordinates of the center of the vertex circle of the wheel flange and the vertex of the wheel flange in the inner side surface of the rim; recovering complete fracture surface contour of the wheel through the light bars of the local contours of the inner side and the outer side of fracture surface of the wheel, and calculating the height of the wheel flange; and subtracting the height of the wheel flange twice from the diameter of the vertex circle of the wheel flange to obtain the diameter of the wheel. The invention discloses a dynamic measurement system for the train wheel diameter simultaneously. The dynamic measurement method and the dynamic measurement system provided by the invention can be adopted for non-contact high-precision dynamic measurement of the train wheel diameter.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a method and system for dynamically measuring the diameter of a train wheel. Background technique [0002] With the development of my country's railway transportation in the direction of high speed, high density, and heavy load, the wear of the tread and rim of the train wheel is becoming more and more serious, which leads to the change of the diameter of the wheel and the change of the matching relationship between the wheel and the rail, which not only intensifies the Damage to the structural components of the wheel set leads to higher railway transportation costs and directly affects the safety of railway transportation. In order to ensure the safety of train operation, the railway department stipulates that running trains should regularly detect the state of the wheels, so as to decide whether to repair or scrap the wheels. [0003] Wheel diameter is an important paramete...

AI Technical Summary

Problems solved by technology

[0007] 1) It is necessary to ensure the geometric relationship between the sensors through a precise mechanical structure. On the one hand, it increases the cost of machining, and on the other hand, it puts forward higher requirements for on-site installation;

[0008] 2) It is very difficult to locate the measurement point by directly measuring the diameter of the tread rolling circle;

[0009] 3) The diameter is measured by the method of circle fitting for multiple tread base points in a small circular arc. The extraction of the feature points has a great influence on the measurement accuracy, and it is difficult to guarantee the measurement accuracy;

[0010] 4) The dynamics of the measurement are not high, generally only the diameter of the train wheel with a speed of 10-30km / h can be measured

Images