Tire uniformity through identification of process effects using singlet tire regression analysis

摘要

A system and related method for improving tire uniformity includes identifying at least one candidate process effect and a corresponding process harmonic number for each process effect. 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 a test set, such that the measurements contain tire harmonics as well as a process harmonics corresponding to each candidate process effect. Rectangular coordinate coefficients are electronically constructed for each said process harmonic, after which point the rectangular coordinates corresponding to each process harmonic are solved for (e.g., by using regression-based analysis). The magnitude of each said process harmonic is estimated, and a final magnitude estimate for each process harmonic can be determined by summarizing (e.g., by taking the average or median value) the respectively estimated magnitudes for each process harmonic across all test tires.

主权项

1. A method for improving the uniformity of tires in tire manufacture, comprising the steps of:
identifying at least one candidate process effect and a corresponding process harmonic number of the at least one candidate process effect; using a measurement machine to measure a given uniformity parameter for each testtire in a set of one or more test tires, wherein the obtained uniformity measurements contain one or more tire harmonics and process harmonics corresponding to each said at least one candidate process effect; wherein the tire harmonics correspond to the component contributions to the obtained uniformity measurements whose sine and cosine terms are integer multiples of 2π/N, where N is the length of a waveform of the measured uniformity parameter, and wherein the process harmonics correspond to the component contributions to the obtained uniformity measurements whose sine and cosine terms are non-integer multiples of 2π/N; electronically constructing rectangular coordinate coefficients for the sine and cosine terms associated with each said process harmonic; electronically solving for the rectangular coordinates corresponding to each said process harmonic for each test tire; electronically estimating the magnitude of each said process harmonic; and electronically determining a final magnitude estimate for each said process harmonic by summarizing the respectively estimated magnitudes for each said process harmonic across all test tires.