System and method of mechanical fault detection based on signature detection
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United States of America Patent
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Jul 28, 2015
Grant Date -
Dec 1, 2011
app pub date -
May 27, 2011
filing date -
May 28, 2010
priority date (Note) -
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Abstract
A mechanical fault detection method and system computes a similarity index to quantify the relationship of a measured spectral signature to a theoretical fault signature. A vibration sensor detects vibrations on machinery with rotating components. The vibration sensor generates a representation of the vibration and provides it to a vibration analyzer. The vibration analyzer is configured to identify peak amplitudes in the generated representation, determine a corresponding frequency for each of the peak amplitudes, and match the determined corresponding frequencies to a theoretical set of frequencies. The analyzer determines a number of matching frequencies and identifies a detection condition when the number of matching frequencies meets a predetermined criterion. The system and method combines vibration amplitude threshold detection with similarity index threshold detection to significantly reduce false fault alarms and false pass errors. The system and method is also used to identify incorrect vibration amplitude thresholds.
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