Vibration monitoring in rotary machines

Details Vibration monitoring in rotary machines Vibration monitoring in rotary machines

1984-07-06

1986-06-10

Ciarlante, Anthony V.

Measuring and testing

Vibration

Sensing apparatus

G01N 2900

Patent

active

045935661

ABSTRACT:
A rotary bladed machine (10) is provided with two probes (16,17) which provide output signals upon the passage past them of the tips (15) of an annular array of rotor blades (14) mounted within the machine (10). Electrical circuitry associated with the probes (16,17) incorporates a ramp generator (29) which provides steadily increasing and decreasing voltages as the blade tips (15) successively pass the probes (16,17). The ramp generator (29) voltage is sampled at regular intervals, the circumferential spacing of the probes (16,17) and the rates of the ramp generator (29) voltage change being chosen such that the sample voltage is zero in the event of the spacings between the blade tips (15) having a predetermined value but is not zero in the event that those spacings depart from the predetermined value. The sampled voltage is a function of the amplitude and frequency of vibration of the disc (13) carrying the blades (14).

REFERENCES:
patent: 3289073 (1966-11-01), Loeffler
patent: 3597963 (1971-08-01), Smejkal
patent: 3654803 (1972-04-01), Robinson
"Noninterference Technique for Measurement of Turbine Engine Compressor Blade Stress", J. Aircraft, vol. 19, No. 1, Jan. 1982, pp. 65-70.
"Performance Evaluation of a Prototype Noninterference Technique for Measurement of Turbine Engine Compressor Blade Stress", Arnold Engineering Development Center, Oct. 1980.

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