Tire uniformity through identification of process harmonics using re-indexed partial uniformity waveforms

A system for improving the uniformity of tires in tire manufacture, comprising:

• at least one non-transitory storage medium configured to store software in the form of computer-executable instructions as well as a plurality of data points for at least one measured uniformity parameter for a set of test tires, wherein the at least one measured uniformity parameter includes one or more tire harmonics and at least one candidate process harmonic, wherein the period of the at least one candidate process harmonic does not fit an integer number of times within a tire circumference;
• at least one processor coupled to said at least one non-transitory storage medium and configured to selectively implement the computer-executable instructions stored therein to perform operations, the operations comprising:
• identifying at least one candidate process harmonic and corresponding period for a set of one or more test tires;
• collecting a set of uniformity waveforms measured for each test tire in the set of one or more test tires, wherein the obtained uniformity waveforms contain one or more tire harmonics and the at least one candidate process harmonic;
• re-indexing each uniformity waveform to the physical order of the at least one candidate process harmonic;
• analyzing the set of re-indexed uniformity waveforms to determine magnitude and azimuth estimates for the at least one candidate process harmonic for each test tire;
• and
• modifying tire manufacture to change the relative location of the at lest one candidate process harmonic within subsequent tires in order to reduce the combined average magnitude of the tire harmonics and the at least one candidate process harmonic.