Method for analyzing tire uniformity utilizing first and second derivative calculation

摘要

A method for analyzing tire uniformity including a force machine (10), the method including the steps of measuring radial and lateral forces of a tire (16), generating radial and lateral waveforms (30) from measurements of the radial and lateral forces of the tire, and calculating the first and second derivatives of the waveforms, preferably using a point-to-point slope calculation. The derivatives may be represented in terms of peak-to-peak pounds force per square seconds, in terms of frequency spectrum, in terms of maximum rate of change, or in terms of root mean squares. The derivatives are then compared to predetermined uniformity specifications, and tires not falling with the specifications are removed. Tangential forces may also be analyzed.