Measuring and testing – Vibration – By mechanical waves
Patent
1993-09-07
1995-12-26
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
73660, 73593, G01N 2904
Patent
active
054777305
ABSTRACT:
The rolling element bearing condition testing method uses acceleration signals at frequencies over 1000 Hertz and employs band-pass and digital filtering and envelope detecting techniques. The testing method measures the vibration signals generated by the rolling element bearing in the frequency range containing the majority of the rolling bearing energy, typically from 2,000 Hertz to 15,000 Hertz, next optionally de-modulates those signals, and then uses digital filter techniques to remove the interference, either from the de-modulated acceleration signal or from the raw acceleration signal. The different digital filtering techniques applied by the testing method are as follows: first, separating interfering signals from the rolling element bearing output signals; second, determining the frequencies of the interfering frequencies to be removed; and, third, compensating the amplitude of rolling element bearing output signals for the portions of the rolling element bearing signals removed with the interference.
REFERENCES:
patent: 4419897 (1983-12-01), Matsuoka
patent: 4488240 (1984-12-01), Kapadia
Flanagan John R.
Oda Christine K.
Williams Hezron E.
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