Patent ID: 8978458
Filing Date: 2015-03-17
Classification: B29D,G01M

Abstract:
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.