Measuring and testing – Vibration – Sensing apparatus
Patent
1994-08-15
1996-03-26
Snow, Walter E.
Measuring and testing
Vibration
Sensing apparatus
324226, 324227, G01H 100, G01H 1100, G08B 2300, G01N 2900
Patent
active
055011055
ABSTRACT:
The present invention is a method and system for accurately analyzing shaft encoder signals from rotating machines. The invention reduces noise and other interferences in the encoder signals by novel means that yield an unprecedented power for extracting useful information. Signal distortion due to variation in the rotation rate of the machinery and due to FFT leakage are eliminated by acquiring digital values of the encoder signals at a set of discrete times that are determined by the properly averaged rotation rate of the shaft and requiring a fixed integer number of these discrete times per rotation of the shaft. Amplitude modulation is eliminated by proper spectral combination of left and right sidebands of the main encoder signal. Additive noise is removed by multiplying sidebands and averaging the results over a number of data records.
REFERENCES:
patent: 4391941 (1983-07-01), Hernandez et al.
patent: 4426641 (1984-01-01), Kurihara et al.
Torsional Vibration Analysis. Application Paper A. R. Crawford, Machine View Incorporated, 1994, pp. 1-9.
Hernandez Walter
Sutermeister Richard
Monitoring Technology Corp.
Snow Walter E.
Woodbridge Richard C.
LandOfFree
Digital signal processing of encoder signals to detect resonance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital signal processing of encoder signals to detect resonance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital signal processing of encoder signals to detect resonance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-909828