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Method and system for improved tire uniformity through improved process harmonic resolution

A uniformity and resolution technology that can be used in general control systems, automotive tire testing, control/regulation systems, etc., and can solve problems such as difficulty in candidate process effects

Active Publication Date: 2019-05-31
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, it can be difficult to isolate candidate process effects with introduction rates that are more closely spaced than allowed by the sampling resolution of the measurement points on the tire

Method used

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  • Method and system for improved tire uniformity through improved process harmonic resolution
  • Method and system for improved tire uniformity through improved process harmonic resolution
  • Method and system for improved tire uniformity through improved process harmonic resolution

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0110] Simulation of uniformity measurements for process harmonics involving five tires. Candidate process harmonics associated with a harmonic number of 0.773 were identified for analysis. The phase angle and point displacement information of the five tires are determined using the waveform alignment method. Table 1 provides a summary of the determined coefficients, phase angles and point displacement information for the five tires:

[0111] Table 1

[0112]

[0113]

[0114] The uniformity measurements for the five tires are re-indexed according to the determined point displacement information, and composite process harmonic samples are generated using the enhanced resolution techniques disclosed herein. Perform regression analysis on a sample of composite process harmonics to identify the magnitude of the process harmonics.

[0115] For comparison purposes, the magnitudes of the process harmonics were also determined using singlet analysis. The single state analys...

example 2

[0120] Process harmonics associated with three different candidate process effects were simulated on five tires, as illustrated in Table 3 below:

[0121] table 3

[0122] Effect number

[0123] Process harmonic magnitudes are estimated for each candidate process effect using a single state method and an enhanced resolution method according to an example aspect of the invention. Table 4 below compares the results of the estimated magnitudes of the singlet method and the enhanced resolution method.

[0124] Table 4

[0125] Effect number

[0126] A near-complete breakdown of the singlet method was noted due to the loss of resolution that occurs when analyzing candidate process effects at the introduced small-spacing rates. However phase angle estimation using singlet methods can be used to align uniformity measurements for enhanced resolution methods. Although the phase angle is not perfectly estimated, the enhanced resolution method still outperforms the...

example 3

[0128] Numerical examples showing homogeneity measurements in the domain of aligned Fourier coefficients are provided below. A single process harmonic with a magnitude of 1 kg and associated with a candidate process effect of 0.877 was simulated on a set of 5 tires with 128 data points per tire. The first four (m=4) Fourier coefficients for the cosine and sine terms of the first four Fourier harmonics for each of the five tires are provided in Table 5 below.

[0129] table 5

[0130] Fourier harmonics

tire

cosine coefficient

Sine coefficient

Amplitude

1

1

0.85852

0.36217

0.93178

2

1

0.05942

0.03660

0.06978

3

1

0.03431

0.03857

0.05162

4

1

0.00968

0.02365

0.02555

1

2

0.39793

0.92768

1.00943

2

2

0.02034

0.13894

0.14043

3

2

0.01856

0.07626

0.07848

4

2

0.02042

0.05854

0.06200

1

3

-0.28186

0.98711

...

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Abstract

The present invention provides methods and systems for improving tire uniformity through the identification of one or more characteristics of candidate process effects. Magnitudes of process harmonics associated with one or more candidate process effects may be identified by combining uniformity measurements for a set of tires to enable enhanced resolution of sampling of the process harmonics. The enhanced resolution method may combine a set of uniformity measurements of multiple tires that are slightly offset from each other to generate a composite process harmonic sample. In particular, the composite process harmonic samples may be generated by aligning the uniformity measurements for each tire in the set of tires based on the azimuthal location of the maximum magnitude of the process harmonics on each tire. The magnitudes of the process harmonics may then be determined using the composite process harmonic samples.

Description

technical field [0001] The present invention relates to tire uniformity and more particularly to improving tire uniformity by estimating the characteristics of process harmonics. Background technique [0002] Among certain quantifiable properties of tires, tire non-uniformity is related to symmetry (or lack thereof) about the tire's axis of rotation. Unfortunately, conventional tire building methods have many opportunities for creating non-uniformities in the tire. During tire rotation, non-uniformities that exist in the tire structure generate periodically varying forces at the wheel axis. Tire non-uniformity is important as these force variations are transmitted as significant vibrations to the vehicle and vehicle occupants. These forces are transmitted through the vehicle's suspension and can be felt on the vehicle's seats and steering wheel, or as noise in the passenger compartment. The amount of vibration transmitted to the vehicle occupants has been classified as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/02
CPCG01M17/024B29D2030/0635B29D30/0633G05B19/418G01M17/02G05B19/4188G05B2219/32348
Inventor W·D·玛弗布伊
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN