Tire Uniformity Correction via Measurement Harmonic Subtraction
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Solution Overview
Problem
Conventional tire uniformity measurement systems struggle to accurately distinguish between tire harmonics and process harmonics, leading to incorrect uniformity measurements due to factors like non-uniform road wheels, which affect ride comfort and tire performance.
Innovation Solution
A method to identify and correct uniformity measurements by analyzing multiple tire revolutions, estimating parameters of measurement process harmonics, and subtracting their effects to provide accurate tire uniformity data, thereby improving tire manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional uniformity measurement systems are used, then measurement process is simple, but measurement precision deteriorates due to inability to distinguish tire harmonics from process harmonics
Solution Approach 1:
The measurement system segments the total uniformity measurement into two distinct components: tire harmonics and process harmonics. By analyzing multiple tire revolutions and identifying periodic patterns, the system separates the measurement signal into tire-specific characteristics and machine-induced characteristics, allowing accurate distinction between actual tire uniformity issues and measurement artifacts.
Solution Approach 2:
The system implements feedback by using the identified process harmonics to correct subsequent uniformity measurements. The measured process harmonic patterns are stored and used to compensate for machine contributions in production tire measurements, continuously improving measurement accuracy by eliminating known measurement errors.
2Manufacturing precision
If process harmonics are not corrected, then measurement process is straightforward, but manufacturing precision deteriorates due to incorrect uniformity measurements
Solution Approach 1:
The system performs preliminary characterization of process harmonics using test tires before production measurement. By identifying and storing the machine's harmonic patterns in advance, the system prepares correction data that can be applied to all subsequent production measurements, improving tire uniformity assessment without adding complexity during actual production testing.
Solution Approach 2:
The system extracts the process harmonic components from the total measurement signal and removes them to reveal the true tire uniformity characteristics. By isolating and eliminating the machine-induced periodic variations, the system provides corrected measurements that reflect only actual tire conditions, improving manufacturing precision.
3Measurement precision
If multiple tire revolutions are analyzed, then measurement precision improves through harmonic identification, but loss of time increases due to extended measurement process
Solution Approach 1:
The system uses a limited number of tire revolutions (excessive but not excessive) to identify process harmonics with sufficient accuracy. By analyzing just enough revolutions to capture the periodic patterns, the system achieves adequate harmonic parameter estimation without unnecessarily extending measurement time, balancing precision improvement with time efficiency.
Data Source
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AI summary
Methods and systems for improving the uniformity of a tire are provided. More particularly, one or more parameters of a measurement process harmonic contributing to uniformity measurements performed for a tire can be identified. The measurement process harmonic can be a process harmonic effect associated with the acquisition of uniformity measurements of a tire, such as a process harmonic effect associated out-of-roundness of a road wheel used to load a tire during uniformity measurement in a uniformity measurement machine. The measurement process harmonic can result solely from the acquisition of uniformity measurements and may not contribute to actual tire non-uniformity. Once identified, the one or more parameters associated with the measurement process harmonic can be used to correct the uniformity measurements of the tire to account for the measurement process harmonic. Tire manufacture can then be modified to improve tire uniformity based on the corrected measurements.