Relative resonant frequency shifts to detect cracks
First Claim
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1. A method for determining if a part is flawed, comprising the steps of:
- detecting frequency of at least two prominent resonant responses of said part;
measuring frequency difference between two of said prominent resonant responses; and
comparing said measured frequency difference between two of said prominent resonances to a predetermined unflawed part frequency difference.
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Abstract
An ultrasonic measurement method for distinguishing between unflawed and flawed parts comprises the steps of detecting at least two prominent resonant response frequencies, measuring the frequency difference between the two frequencies, determining the ratio of the frequency difference to one of said frequencies, and comparing the ratio to a predetermined part criterion. Resonant response frequencies dependant upon physical characteristics such as dimensions and weight are compared to other resonances which are at frequencies dependant upon stiffness of the part.
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Citations
18 Claims
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1. A method for determining if a part is flawed, comprising the steps of:
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detecting frequency of at least two prominent resonant responses of said part; measuring frequency difference between two of said prominent resonant responses; and comparing said measured frequency difference between two of said prominent resonances to a predetermined unflawed part frequency difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of flaw detection in one part of a plurality of otherwise identical parts comprising the steps of:
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(1) vibrating said part at a plurality of frequencies; (2) identifying of a first frequency at which said part resonates; (3) identification of a second frequency at which said part resonates; (4) determining the difference between said first and second frequencies; (5) dividing said difference by one of said first and second frequencies to obtain a number; and (6) comparing said number to a predetermined number to determine the presence of a flaw. - View Dependent Claims (16)
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17. A method of flaw detection in one part of a plurality of otherwise identical parts comprising the steps of:
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(1) identifying first and second resonant response frequencies; (2) determining the difference between said first and second resonant response frequencies; (3) dividing said difference by one of said first and second response frequencies to determine a percentage change in frequency; and (4) comparing said percentage change to a standard percentage change to determine the presence of a flow. - View Dependent Claims (18)
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Specification