关键词: 圆度评定, 误差转换, 图像域, 遗传算法

Abstract:

For solving the problems of roundness error assessment methods with profound theory, complex computation, low detection efficiency and inapplicable to sample points with large capacity in engineering application, a new method was proposed based on error transformation and image domain. The method transformed the roundness errors from the field measurements to the image domain and made it meet the requirements of error estimation. The method took the least square circle as the initiative round to seek the  “minimumin maximum” of its radius or radius difference. And then through small scale translation of the least square circle and getting the translation planning coordinate by genetic algorithm, the ideal circle after translation and roundness error value were obtained. Experimental results of a certain type of part show that the roundness error can be evaluated effectively and exactly by using this method because it is very close to the results measured by coordinate measuring machine.

Key words: roundness evaluation, error transformation, image domain, genetic algorithm