Process for the robust alignment of wheel profile contour data sets on partially disturbed inner wheel surfaces as the basis for the precise determination of the wheel profile parameters of rail vehicles

摘要

Process for the robust alignment of wheel profile contour data sets consisting of contour points, which contain points related to the length of an inner wheel surface and radii related to a measuring circle radius, of measurements on partially disturbed inner wheel surfaces of rail vehicles as the basis for the precise determination of the wheel profile parameters of rail vehicles, whereby a repeatedly executed algorithm generates is used as a model, whereby • in the first step two points are randomly selected from an initial data set that depicts parts or the complete contour of an inner wheel surface, • a straight line equation (model line) is calculated from the two selected points, • determines the subset of the points in the output data set, whose orthogonal distance from the model line is smaller than a predetermined limit value G, • and this subset is evaluated using a target function S, the target function S being determined by a It is expanded to at least two dimensions and additional information is integrated into the objective function S, so that the intact part of the inner wheel surface can be determined, whereby the objective function S is composed of multiplicative components, which on the one hand the orthogonal distance of the contour points from the respective model line and secondly, a predefined radius-dependent probability for the presence of an intact inner wheel surface is evaluated and the objective function as the objective function Smax to be maximized in several runs of the algorithm is carried out as follows: multiplicative form: with and the weighting function q being the probability H (radius) for the presence of an intact inner wheel surface is used as a function of the radius.