Measuring and testing – Vibration – Resonance – frequency – or amplitude study
73583, 73658, G01H 1300, G01H 100, G01D 100
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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patent: 3023610 (1962-03-01), Prochazka
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patent: 3899921 (1975-07-01), Hockley
patent: 4070022 (1978-01-01), Braly
patent: 4170141 (1979-10-01), Woo
patent: 4212193 (1980-07-01), Turley
"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.
Carlson David V.
Ciarlante Anthony V.
Societe Nationale d'Etude et de Construction de Moteurs d'Aviati
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