Tire defect detection system and method
First Claim
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1. A tire defect detection system comprising:
- a support structure for receiving a tire;
an actuator disposed proximate the tire for impacting the tire;
a microphone disposed proximate the actuator for receiving a sound wave generated when the actuator impacts the tire; and
a computer responsive to the microphone;
the computer including;
means for calculating a plurality of discriminator quantities from the sound wave, and means for comparing the calculated discriminator quantities with stored discriminator quantities indicative of a defect to determine whether a defect is present in the tire.
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Abstract
A tire defect detection system including a support structure for receiving a tire; an actuator disposed proximate the tire for impacting the tire; a microphone disposed proximate the actuator for receiving a sound wave generated when the actuator impacts the tire; and a computer responsive to the microphone, the computer programmed to calculate a number of discriminator quantities from the resulting sound wave and to compare the calculated discriminator quantities with stored discriminator quantities indicative of a defect to determine whether a defect is present in the tire.
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Citations
33 Claims
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1. A tire defect detection system comprising:
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a support structure for receiving a tire;
an actuator disposed proximate the tire for impacting the tire;
a microphone disposed proximate the actuator for receiving a sound wave generated when the actuator impacts the tire; and
a computer responsive to the microphone;
the computer including;
means for calculating a plurality of discriminator quantities from the sound wave, and means for comparing the calculated discriminator quantities with stored discriminator quantities indicative of a defect to determine whether a defect is present in the tire. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A tire defect detection system comprising:
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an actuator for impacting the tire;
a microphone disposed proximate the actuator for receiving a sound wave generated when the actuator impacts the tire; and
a computer responsive to the microphone, the computer programmed to;
perform an FFT transform for the sound wave, calculate a plurality of discriminator quantities from the FFT transform, and construct a defect transfer function based on the calculated discriminator quantities to provide an indication of whether a defect is present in the tire.
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18. A method of inspecting tires for defects, the method comprising:
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obtaining a tire with known defects;
impacting the tire with an actuator;
recording the resulting sound waves;
calculating a plurality of discriminator quantities for each sound wave;
constructing a defect transfer function based on the calculated discriminator quantities and storing the coefficients thereof;
obtaining a tire with unknown defects;
impacting the unknown tire with an actuator;
recording the resulting sound waves;
calculating a plurality of discriminator quantities for each sound wave; and
using the stored coefficients of the constructed defect transfer function to determine whether a defect is present in the tire with unknown defects.
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19. A tire defect detection method comprising:
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disposing an actuator proximate the tire and impacting the tire;
disposing a microphone proximate the actuator for receiving a sound wave generated when the actuator impacts the tire;
calculating a plurality of discriminator quantities from the sound wave; and
comparing the calculated discriminator quantities with stored discriminator quantities indicative of a defect to determine whether a defect is present in the tire. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A tire defect detection method comprising:
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recording a sound wave generated when the tire is impacted;
performing a FFT transform for the sound wave;
calculating a plurality of discriminator quantities from the sound wave and FFT transform; and
constructing a defect transfer function based on the calculated discriminator quantities to provide an indication of whether a defect is present in the tire.
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Specification