Apparatus for measuring torsional vibrations of rotating machine

Details Apparatus for measuring torsional vibrations of rotating machine Apparatus for measuring torsional vibrations of rotating machine

1993-01-11

1995-02-21

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73660, 364508, G01H 110

Patent

active

053905458

ABSTRACT:
An apparatus for measuring torsional vibrations of rotating machinery is provided. A wheel having a plurality of spaced apart teeth is connected to the rotating machinery. A sensor detects the speed of wheel rotation and responsively produces a speed signal that has a frequency proportional to the rotational wheel speed. A timing device receives the speed signal, determines the period of the most recent pulse of the speed signal, and responsively produces an instantaneous period signal that has a value representative of the determined period. A microprocessor receives the instantaneous period signal, determines an instantaneous speed value of the rotating wheel and an average speed value of the rotating wheel based on previous wheel rotations. The microprocessor further produces an instantaneous torsional velocity signal that has a value equal to the difference of the average speed value and the instantaneous speed value, and an instantaneous torsional displacement signal in response to numerically integrating the torsional velocity signal value. Finally, an output device receives the instantaneous torsional signals and displays the representative values.

REFERENCES:
patent: 2991618 (1961-07-01), Marscher et al.
patent: 3885420 (1975-05-01), Wolfinger
patent: 4250758 (1981-02-01), Pitts, Jr. et al.
patent: 4347571 (1982-08-01), Leung et al.
Publication: "Torsional Vibration Measurements in the Preventive Maintenance of Rotating Machinery", Harold Herschkowitz, Fourth in a Series of Technology Interchange on Machinery Vibration Monitoring and Analysis, published by The Vibration Institute.

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