Method and system for rigid surface contact process analysis based on image control point registration

Abstract

The invention provides a rigid surface contact process analysis method and system based on image control point registration. First, the part surface is measured through three-dimensional high-resolution surface topography measurement technology to obtain three-dimensional high-density point cloud data, and then MATLAB is used to convert it. is a grayscale image. The feature point coordinates are obtained by extracting features such as cylinder holes and threaded holes on the image, and the corresponding relationship between the feature point coordinates is obtained using the assembly relationship, and the affine transformation matrix is ​​obtained. Finally, the affine matrix is ​​used to transform the two images into the same coordinate system and the normal distance of the same coordinate position is calculated to obtain the initial surface difference image. By gradually reducing the normal distance between the two surfaces, the changes in the contact points during the contact process between the two surfaces can be analyzed. The contact analysis method of the present invention can analyze the global contact of part surfaces, has high calculation efficiency, and avoids the shortcomings of long calculation time and small analysis area of ​​the finite element method.

Description

technical field [0001] The invention relates to the technical field of contact analysis and image processing of mating surfaces, in particular to a method for analyzing a rigid surface contact process based on image control point registration. In particular, the patent document CN103544694A method is used to generate a grayscale image that can reflect the overall surface morphology of the part, extract the feature points of the two surfaces that cooperate with each other, and perform image registration through the feature points to obtain the initial contact surface difference of the two surfaces, and in the form of an image Show the contact process with the surface difference gradually shrinking. Background technique [0002] The contact behavior between mechanical joint surfaces greatly affects the friction and wear, fit properties, transmission accuracy, sealing and other properties of the mechanical system, and directly affects the performance and life of the machine. W...

AI Technical Summary

Problems solved by technology

However, these methods only analyze one surface, and it is difficult to obtain the actual contact area and contact process when two workpiece surfaces are in contact.

Images