Cyclic time averaging for machine monitoring
First Claim
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1. A system for analyzing vibration data, said system comprising:
- an input port configured to receive a plurality of vibration amplitude samples taken at discrete sampling times, wherein said vibration amplitude samples are taken from a machine having a characteristic repeated cyclic phenomena recurring over a period M;
a first module configured to estimate vibration amplitudes at times between said discrete sampling times, wherein said first module comprises an interpolator; and
a second module configured to use said estimated vibration amplitudes in performing a cyclic average,wherein adjacent discrete sampling times are separated by a time period of 1/FS, where FS is a sampling frequency, and wherein period M=(n+α
)/FS, wherein n is an integer, and α
is a number between 0 and 1.
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Abstract
A cyclic time averaging method is directed at processing time-domain vibration data of the machine to produce an averaged time waveform over a selected cyclic time period. It is not necessary to employ a triggering signal to obtain the averaged time waveform.
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Citations
2 Claims
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1. A system for analyzing vibration data, said system comprising:
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an input port configured to receive a plurality of vibration amplitude samples taken at discrete sampling times, wherein said vibration amplitude samples are taken from a machine having a characteristic repeated cyclic phenomena recurring over a period M; a first module configured to estimate vibration amplitudes at times between said discrete sampling times, wherein said first module comprises an interpolator; and a second module configured to use said estimated vibration amplitudes in performing a cyclic average, wherein adjacent discrete sampling times are separated by a time period of 1/FS, where FS is a sampling frequency, and wherein period M=(n+α
)/FS, wherein n is an integer, and α
is a number between 0 and 1.
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2. A system for analyzing vibration data, said system comprising:
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an input port configured to receive a plurality of vibration amplitude samples taken at discrete sampling times, wherein said vibration amplitude samples are taken from a machine having a characteristic repeated cyclic phenomena recurring over a period M; a first module configured to estimate vibration amplitudes at times between said discrete sampling times, wherein said first module comprises an interpolator; and a second module configured to use said estimated vibration amplitudes in performing a cyclic average, wherein said second module comprises an averager configured to produce an average vibration amplitude by computing the average of a first sampled value at time p and the sampled or interpolated vibration amplitude value at one or more later times p+m(n+α
), where m is an integer, n is an integer, and α
is a number between 0 and 1.
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Specification
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Current AssigneeSKF USA Incorporated (SKF)
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Original AssigneeSKF Condition Monitoring Inc
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InventorsBoerhout, Johannes I.
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Primary Examiner(s)Barlow; John
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Assistant Examiner(s)LE, JOHN H
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Application NumberUS10/903,949Publication NumberTime in Patent Office1,187 DaysField of Search702/34, 702/35, 702/36, 702/39, 702/43, 702/56, 702/85, 702 86- 94, 702183-185, 700/280, 318/611, 736/60, 162/198US Class Current702/56CPC Class CodesG01H 1/003 of rotating machines G01H1/...G05B 23/0235 based on a comparison with ...
