Torsional vibration monitoring apparatus for rotating shaft syst

Details Torsional vibration monitoring apparatus for rotating shaft syst Torsional vibration monitoring apparatus for rotating shaft syst

1979-09-12

1981-05-19

Gill, James J.

Measuring and testing

Vibration

Sensing apparatus

364801, G01H 110, G06G 764

Patent

active

042677343

ABSTRACT:
The present invention relates to a torsional vibration monitoring apparatus for a rotating shaft system which is characterized by comprising a detector disposed at a certain position of the rotating shaft system for detecting torsional vibration of the shaft system, a memory device for storing the torsional vibration having a constant time duration which is detected by the detector as a time series data obtained by sampling the torsional vibration with minute unit times, a Fourier transforming device for Fourier-transforming the time series data to obtain a frequency series data, multiplier each for multiplying the frequency series data with a relation which is previously obtained between the vibration of the shaft system at the certain position of the shaft system and that at an arbitrary position thereof at respective frequencies to obtain a frequency series data for the arbitrary position, and reverse Fourier transformer for reverse-Fourier-transforming the frequency series data to obtain a time series data of the torsional vibration of the shaft system at the arbitrary position thereof.

REFERENCES:
patent: 2420891 (1947-05-01), McCann et al.
patent: 3093731 (1963-06-01), Karplus
patent: 4051427 (1977-09-01), Kilgore et al.

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