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.