Identification of resonant frequencies of vibration of rotating

Details Identification of resonant frequencies of vibration of rotating Identification of resonant frequencies of vibration of rotating

1997-08-15

1999-11-02

Williams, Hezron

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

G01H 1300

Patent

active

059748826

ABSTRACT:
A method for determining the resonant frequency of vibration of a rotating blade comprises determining the approximate resonance frequency and rotating a blade at a plurality of frequencies in a range above and below the approximate frequency. At each frequency two measurements are taken representative of synchronous amplitudes at each measurement point (P.sub.1 and P.sub.2) wherein the two points are separated by an angle .beta. and there are an unknown number x of complete synchronous vibrations between the two points. A set of data is provided and a plot of P.sub.1 and P.sub.2 produced, the data being analysed to determine a likely value of x and hence the resonant frequency.

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"International Gas Turbine Conference" 1983 pp. 953-960.
"Measurement of Resonance Vibrations of Turbine Blades with Elura Device" Foreign Technology Division Jun. 15, 1978.

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