Method for prediction and control of harmonic components of tire uniformity parameters
First Claim
1. A method of electronically determining uneven mass distribution levels for a production tire based on measured radial run out values, said method comprising:
- electronically establishing a calibration curve for one or more test tires that correlates at least one harmonic of interest for measured radial run out to electronically calculated centripetal force;
measuring on a tire measurement apparatus the radial run out for the production tire having unknown uneven mass distribution, and isolating at least one harmonic of interest from the measured radial run out;
electronically mapping the at least one harmonic of interest of the measured radial run out for the production tire to centripetal force using the calibration curve; and
electronically calculating the uneven mass distribution for the production tire from the centripetal force identified from said electronically mapping step; and
grinding or adding extra mass to the production tire to reduce levels of uneven mass distribution identified in the production tire.
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Accused Products
Abstract
Improved and more easily implemented methods for predicting high speed radial force variation and uneven mass distribution utilize other measurements such as radial nm out and other parameters. The prediction model for high speed radial force variation uses a speed-dependent calibration term for predicting higher harmonic components, while the same or other models can be used for the first harmonic. The uneven mass distribution prediction model accounts for deformation of the tire along multiple tracks, thus employing a more realistic model of crown deformation that accounts for changing tire stiffness levels across different harmonic components of the measured and predicted parameters.
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Citations
17 Claims
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1. A method of electronically determining uneven mass distribution levels for a production tire based on measured radial run out values, said method comprising:
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electronically establishing a calibration curve for one or more test tires that correlates at least one harmonic of interest for measured radial run out to electronically calculated centripetal force; measuring on a tire measurement apparatus the radial run out for the production tire having unknown uneven mass distribution, and isolating at least one harmonic of interest from the measured radial run out; electronically mapping the at least one harmonic of interest of the measured radial run out for the production tire to centripetal force using the calibration curve; and electronically calculating the uneven mass distribution for the production tire from the centripetal force identified from said electronically mapping step; and grinding or adding extra mass to the production tire to reduce levels of uneven mass distribution identified in the production tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of electronically determining high speed radial force variation for a production tire based on measured radial run out values and a speed-dependent calibration model, said method comprising:
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measuring radial run out for a plurality of test tires at low speed and at high speed; measuring radial force variation for the plurality of test tires at low speed and at high speed; using the radial run out and radial force variation measurements to electronically calculate coefficients for generating a speed-dependent calibration model relating low speed radial force variation and radial run out to high speed radial force variation as a function of at least a rotational frequency of the production tire at high speed such that the rotational frequency is a variable in the speed-dependent calibration model; measuring radial run out for a production tire at low speed and at high speed; measuring radial force variation for the production tire at low speed; and electronically calculating high speed radial force variation by applying the radial run out and radial force variation measurements for the production tire to the speed-dependent calibration model; and grinding or adding extra mass to the production tire to reduce levels of high speed radial force variation identified in the production tire. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification