A
system and related method for improving
tire uniformity includes providing a number (n) of test tires manufactured in a known order and identifying at least one candidate
cyclic process effect with a corresponding frequency of introduction (f). A given uniformity parameter, such as radial or lateral run-out, balance,
mass variation, radial lateral or
tangential force variation, is measured for each tire in the
test set, and measured data points are combined into a concatenated composite waveform. At least one process
harmonic associated with each identified
cyclic process effect is separated from the tire
harmonics, for example, by Fourier transformation with identification of the process
harmonics as positive integer multiples of the mth
harmonic of the measured uniformity parameter where m=n / f. Once the process
harmonics are extracted, filtered uniformity measurements can be provided or new tires can be built with the process effect minimized.