Method and apparatus for detecting defects in an object by vibrating the object in a plurality of positions
First Claim
1. A method of detecting a defect in a test object, comprising the steps of:
- (a) applying vibration to a three-dimensional test object at two positions on a side thereof to vibrate the test object;
(b) generating a signal representing actual vibrations of the test object;
(c) converting the signal generated in said step (b) to energy peak data indicative of a natural vibration of the test object and indicative of a defect-induced vibration of the test object when the test object is vibrated at two positions; and
(d) comparing energy peaks indicative of a natural vibration and energy peaks indicative of a defect-induced vibration to determine whether a defect is present in the test object.
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Accused Products
Abstract
A test object such as an engine cylinder is inspected for any defect such as a crack, a blowhole, a cavity, or the like by applying vibration to the test object at two different positions on a side thereof. While the test object is vibrating, signals indicative of the vibration of the test object are detected. From the detected signals, there are produced a signal indicative of a natural vibration of the test object and a signal indicative of a defect-induced vibration of the test object. The signal indicative of a natural vibration and the signal indicative of a defect-induced vibration are compared to determine whether there is a defect in the test object.
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Citations
24 Claims
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1. A method of detecting a defect in a test object, comprising the steps of:
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(a) applying vibration to a three-dimensional test object at two positions on a side thereof to vibrate the test object; (b) generating a signal representing actual vibrations of the test object; (c) converting the signal generated in said step (b) to energy peak data indicative of a natural vibration of the test object and indicative of a defect-induced vibration of the test object when the test object is vibrated at two positions; and (d) comparing energy peaks indicative of a natural vibration and energy peaks indicative of a defect-induced vibration to determine whether a defect is present in the test object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus for detecting a defect in a test object, comprising:
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vibrating means for vibrating a test object in a plurality of positions; detecting means for detecting vibration of the test object and converting the detected vibration into an electric signal; and determining means for determining whether there is a defect in the test object according to energy peaks in the electric signal from said detecting means which is indicative of a natural vibration of the test object and of a defect-induced vibration of the test object. - View Dependent Claims (21, 22, 23, 24)
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Specification