Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1994-02-10
1996-05-28
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73657, G01H 900, G01H 1300, G01N 2912
Patent
active
055200524
ABSTRACT:
A non-destructive method and apparatus for determining the structural integrity of materials by combining laser vibrometry with damping analysis techniques to determine the damping loss factor of a material. The method comprises the steps of vibrating the area being tested over a known frequency range and measuring vibrational force and velocity as a function of time over the known frequency range. Vibrational velocity is preferably measured by a laser vibrometer. Measurement of the vibrational force depends on the vibration method. If an electromagnetic coil is used to vibrate a magnet secured to the area being tested, then the vibrational force is determined by the amount of coil current used in vibrating the magnet. If a reciprocating transducer is used to vibrate a magnet secured to the area being tested, then the vibrational force is determined by a force gauge in the reciprocating transducer. Using known vibrational analysis methods, a plot of the drive point mobility of the material over the preselected frequency range is generated from the vibrational force and velocity measurements. The damping loss factor is derived from a plot of the drive point mobility over the preselected frequency range using the resonance dwell method and compared with a reference damping loss factor for structural integrity evaluation.
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Dixon Harold M.
Finley Rose M.
Moser William R.
The United States of America as represented by the United States
Tumm Brian
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