Method for correcting concave-convex exhibited on a surface of a body of rotation

Abstract

Providing a method for correcting a data of irregularity of a surface of a body of rotation with an eccentricity included to a data being not affected by eccentricity. The distance data Lbetween the tire crown portionof the tireto be inspected and the distance sensor is measured at each of measurement points Xat every angular displacement Δθ in a circumferential direction of the tire and also radius value rare computed from the above distance data Land the distance Lbetween the center of rotation of the tire and the distance sensor; and further the surface length Sis computed by integrating the radius value rwith respect to Δθ from the measurement starting point to a current measurement point k and the irregularity data is converted into the form of (X, r) and then the radius values Rat the irregularity computing points Xdividing the one round surface length Sof the tire into equal intervals are computed based on the radius values rand r+1 at the measurement points Xand X+1 adjacent to the irregularity computing point X, serving as an irregularity data (X, R) at respective points dividing the surface of the tire crown portion into equal intervals circumferentially the tire.