Mathematical Modeling For Measuring Curving Plane And Application

This paper is original from "On-line Measuring System for Cragged Surface on Special Working Conditions", supported by the Science and Technology Research Foundation of Anhui province. This project mainly researches on the technique of measuring geometric parameters on train wheel profile applying stereovision measurement technology.People have been researching on the techniques of measuring geometric parameters on train wheel profile for decades at home and abroad. Many techniques have been achieved and proved to be practical. They have been changing from traditional mechanical and contact measurement to photoelectric techniques. With the development of computer image processing and photoelectric techniques, stereovision measurement techniques have been widely used in industrial measurement. This project researches on the stereovision measurement techniques for the parameters of train wheel profile.This measuring system applies linear laser. The laser bean is projected onto the surface of the wheel profile. The laser light plane and the wheel profile intersect to form a profile curve, which shows the shape of wheel trackside. The image of the curve is obtained by planar CCD system. The author independently works on: (1) the image processing:(2) the imaging model of the CCD cameras, that is the coordinate transforming relationship between the image coordinates and the corresponding world coordinates: (3) the method of curve connection: (4) the experiments of the figures of the wheel trackside profile and calculation of the flange thickness related to the wheel wear. The accuracy of measurement meets the requirement.