Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1979-05-21
1981-08-18
Kreitman, Stephen A.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73 1DV, G01H 1300
Patent
active
042839521
ABSTRACT:
The method and apparatus of the invention simultaneously induces the same variable frequency mechanical vibrations in a test part and a standard. The vibrations of the two are converted to signals which are either displayed for comparison purposes or automatically analyzed for differences. Advantageously, the signals are electrical signals providing spectra which are analyzed for differences in amplitudes produced by the signals. Where the parts are separately supported, they are held with substantially the same force and are maintained against the vibration inducing mechanism with the same force. Where accelerometers are used, they are held with substantially the same force against the vibrating parts.
REFERENCES:
patent: 2612772 (1952-10-01), McConnell
patent: 3043132 (1962-07-01), Schubring
patent: 4122723 (1978-10-01), Levizzari et al.
patent: 4122724 (1978-10-01), Geithman et al.
Krautkraner "Ultrasonic Testing of Materials," 2nd Edition, 1977, Springer-Verlag, pp. 265, 266.
Kreitman Stephen A.
Laser Technology, Inc.
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