Research of Sphericity Error Evaluation Method of Calculating the Uncertainty in the Specification

In order to address the existing problem that only the measurement of uncertainty is provided for the tolerance results, a calculating method of sphericity error evaluation standard uncertainties studied according to new Geometrical Product Specification and Verification(GPS). Sphericity error evaluation mathematical model based on minimum area method is raised. Sphericity error value is obtained by using improved Particle swarm optimization (PSO) algorithm. Standard uncertainty specific calculating method is raised through studying each element's trans-mission coefficient and correlation coefficient which affect standard uncertainty. And sphericity error evaluation of the graphical interface is developed. On the strength of real cases, the method proposed in this article can be used in the new GPS system to evaluate the sphericity errors accurately, visually and conveniently.