FAILURE WARNING FOR A TIRE AMONG A PLURALITY OF TIRES
First Claim
1. A method for determining immanence of catastrophic failure for a selected tire among a plurality of tires that are concurrently in operation, the method comprising the steps of:
- selecting a tire from the plurality of tires;
monitoring vibration amplitude versus time signals for the selected tire;
using signal averaging to minimize signal noise in the selected tire'"'"'s vibration signals;
at selected intervals, fast Fourier transforming the averaged vibration signals to create a harmonic spectrum for the selected tire;
cleaning the selected tire'"'"'s harmonic spectrum by applying coherence function and averaging calculations to it for minimizing contributions to the selected tire'"'"'s harmonic spectrum from all other vibration sources including the remaining one(s) of the plurality of tires;
comparing the most recent cleaned spectrum with stored values of previous cleaned spectra of the selected tire to track changes in higher order harmonic magnitudes; and
determining whether catastrophic failure of the selected tire is immanent by analyzing the changes in higher order harmonic magnitudes and comparing them with predetermined failure criteria.
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Accused Products
Abstract
Method and system for determining immanence of catastrophic failure for a selected tire among a plurality of tires that are concurrently in operation, the method comprising the steps of: selecting a tire from the plurality of tires; monitoring vibration amplitude versus time signals for the selected tire; using signal averaging to minimize signal noise in the selected tire'"'"'s vibration signals; at selected intervals, fast Fourier transforming the averaged vibration signals to create a harmonic spectrum for the selected tire; cleaning the selected tire'"'"'s harmonic spectrum by applying coherence function and averaging calculations to it for minimizing contributions to the selected tire'"'"'s harmonic spectrum from all other vibration sources including the remaining one(s) of the plurality of tires; comparing the most recent cleaned spectrum with stored values of previous cleaned spectra of the selected tire to track changes in higher order harmonic magnitudes; and determining whether catastrophic failure of the selected tire is immanent by analyzing the changes in higher order harmonic magnitudes and comparing them with predetermined failure criteria.
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Citations
18 Claims
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1. A method for determining immanence of catastrophic failure for a selected tire among a plurality of tires that are concurrently in operation, the method comprising the steps of:
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selecting a tire from the plurality of tires;
monitoring vibration amplitude versus time signals for the selected tire;
using signal averaging to minimize signal noise in the selected tire'"'"'s vibration signals;
at selected intervals, fast Fourier transforming the averaged vibration signals to create a harmonic spectrum for the selected tire;
cleaning the selected tire'"'"'s harmonic spectrum by applying coherence function and averaging calculations to it for minimizing contributions to the selected tire'"'"'s harmonic spectrum from all other vibration sources including the remaining one(s) of the plurality of tires;
comparing the most recent cleaned spectrum with stored values of previous cleaned spectra of the selected tire to track changes in higher order harmonic magnitudes; and
determining whether catastrophic failure of the selected tire is immanent by analyzing the changes in higher order harmonic magnitudes and comparing them with predetermined failure criteria. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A vehicle tire failure prediction and warning system for a vehicle having a plurality of tires, the system comprising:
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a vibration sensor mounted close to each one of the plurality of tires;
a computer connected for collecting and storing vibration amplitude versus time signals for each one of the plurality of tires, and capable of calculating fast Fourier transform spectra, and of comparing vibration amplitudes and harmonic magnitudes over time such that indicative changes in vibration amplitudes, harmonic magnitudes, and/or rates of change of harmonic magnitudes can be determined; and
a display system in the vehicle for warning a vehicle operator about values of the indicative changes determined by the computer that are predetermined to be predictive of immanent catastrophic tire failure. - View Dependent Claims (17, 18)
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Specification