Condition based monitoring by vibrational analysis
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United States of America Patent
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-
Mar 4, 2003
Grant Date -
Jul 4, 2002
app pub date -
Nov 8, 2001
filing date -
Sep 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method monitors the condition of a bearing/shaft assembly by forming diagnostics based on spectral analysis of assembly's vibration. Baseline parameters are determined by a microprocessor analysis of the vibration spectra, comparing actual peaks to the peaks predicted by a model. The microprocessor estimates rotation rate and preferably number of rolling elements by attempting to fit the model to the actual vibrational spectrum, by varying the assumptions. Baseline profiles are formed from one or more selected tones and preferably also harmonics thereof, to characterize the bearing/shaft assembly. The baseline profiles and parameters are compared against later acquired vibrational characteristics, and the comparison is used to diagnose bearing and/or shaft conditions.
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