System for determining machine running speed from machine vibration: apparatus and method
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United States of America Patent
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Sep 28, 2004
Grant Date -
Aug 12, 2004
app pub date -
Feb 7, 2003
filing date -
Feb 7, 2003
priority date (Note) -
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Abstract
A System for determining machine running speed by sampling and digitizing a complex signal sensed by a transducer monitoring a machine into a digitized signal; mixing the digitized signal with a digitized signal having a predetermined frequency for obtaining a stream of inphase and quadrature components; filtering intervals of the stream of components for obtaining a plurality of vectors each having a phase; determining a unknown signal frequency of a vibration component contained in the complex vibration signal as a function of at least the one phase per second value, and calculating the machine running speed as a function of the plurality of vectors.
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