System for measuring resonance frequencies in turbine and compre

Details System for measuring resonance frequencies in turbine and compre System for measuring resonance frequencies in turbine and compre

1981-06-24

1983-06-28

Ciarlante, Anthony V.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73583, 73658, G01H 1300, G01H 100, G01D 100

Patent

active

043898912

ABSTRACT:
A system for measuring resonance frequencies in turbine and compressor vanes and propeller blades in which a vane or blade is excited at its base by a vibration generator and the phase of the excitation signal coming out of an acoustic transducer placed at the base is compared to that of the signal coming from a displacement transducer placed at the blade tip. The resulting phase error signal serves to pilot a variable-frequency oscillator which itself feeds the vibration generator, the frequency of which is noted by a frequency meter.

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"Review of Scientific Instruments", vol. 47, No. 9, Sep. 1976, A. Klimasara et al.: Automated Resonance-Bar Damping Measurement System, pp. 1163-1166-Description of the System-Figure 1.

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