Patent ID: 9645052
Date: 2017-05-09
CPC Classifications: B29D,G01M,G01N

Claim:
1. A method for improving the uniformity of tires in tire manufacture, comprising the steps of: identifying a candidate process harmonic and corresponding period for a set of consecutively produced test tires which each have a circumference, wherein the corresponding period of the candidate process harmonic, defined relative to the dimensions of the test tires, is not an integer divisor of the circumference; collecting a set of uniformity waveforms by measuring a uniformity waveform for each test tire, wherein each uniformity waveform contains one or more tire harmonics and the candidate process harmonic; re-indexing the collected uniformity waveforms so that breaks between the waveforms for the consecutive tires matches the physical order of the candidate process harmonic and combining the re-indexed waveforms into a concatenated waveform with a period corresponding to the period of the candidate process harmonic; analyzing the set of re-indexed uniformity waveforms to determine magnitude and azimuth estimates for the candidate process harmonic; and modifying the tire manufacture based on the magnitude and azimuth estimates for the candidate process harmonic by slowing or accelerating a manufacturing process to reduce the combined average magnitude of the one or more tire harmonics and the candidate process harmonic for subsequent tires created by the tire manufacture.