Torsional vibration monitor

Details Torsional vibration monitor Torsional vibration monitor

1980-07-30

1982-03-02

Ciarlante, Anthony V.

Measuring and testing

Vibration

Sensing apparatus

73660, G01H 110

Patent

active

043173713

ABSTRACT:
An improvement in torsional vibration monitors wherein a frequency shift is applied to the torsional vibration signal to achieve improved stability and increased confidence in the measurement. The torsional vibration signal is applied to parallel frequency shifters to produce a lower frequency measuring signal and a lower frequency reference signal. The two lower frequency signals are applied to parallel connected filters to obtain spectral content of the signals. Once the spectral content is obtained, each lower frequency measuring signal and each lower frequency reference signal is shifted back to the original frequency range to produce filtered reference signals and filtered measuring signals. These signals are then correspondingly summed to provide a set of torsional vibration signals segregated with respect to the frequency spectrum and meaningful with respect to a time base.

REFERENCES:
patent: 2915897 (1959-12-01), Hoffmann
patent: 3885420 (1975-05-01), Wolfinger
patent: 3934459 (1976-01-01), Wolfinger et al.
patent: 4121272 (1978-10-01), Wolfinger
patent: 4148222 (1979-04-01), Wolfinger
patent: 4209778 (1980-06-01), Wehde et al.

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