Harmonic activity locator
First Claim
1. A method of differentiating between vibration measurements indicative of the presence of a component defect in a machine and vibration measurements unrelated to the component defect, the method comprising:
- receiving a frequency spectrum associated with said machine;
estimating a component defect fundamental frequency and harmonic frequencies and associated amplitudes;
estimating a value K indicative of the total energy associated with said fundamental and harmonic frequencies;
estimating a value R indicative of the total energy associated with said spectrum;
deriving a value IHAL based at least in part on the estimated values K and R; and
determining based at least in part on IHAL and the fundamental frequency of the component defect whether the vibrations of the machine are produced by the component defect.
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Accused Products
Abstract
Systems and methods for identifying the presence of a defect in vibrating machinery. An exemplary method comprises analysis of frequency spectrum vibration data of the machine. The method comprises deriving a harmonic activity index based on estimates of the energy associated with the frequency spectrum and the energy associated with the defect'"'"'s harmonic series. The method may comprise deriving a value K by estimating a value M indicative of the energy of the defect'"'"'s harmonic series and dividing M by the number of spectral lines corresponding to the defect'"'"'s harmonic series. The method may further comprise deriving a value R by estimating a value Q indicative of the energy in the frequency spectrum data and dividing Q by the number of spectral lines of the frequency spectrum data. The method further comprises deriving the harmonic activity index based on the estimated K and R. Related systems for executing the methods are also disclosed.
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Citations
34 Claims
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1. A method of differentiating between vibration measurements indicative of the presence of a component defect in a machine and vibration measurements unrelated to the component defect, the method comprising:
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receiving a frequency spectrum associated with said machine;
estimating a component defect fundamental frequency and harmonic frequencies and associated amplitudes;
estimating a value K indicative of the total energy associated with said fundamental and harmonic frequencies;
estimating a value R indicative of the total energy associated with said spectrum;
deriving a value IHAL based at least in part on the estimated values K and R; and
determining based at least in part on IHAL and the fundamental frequency of the component defect whether the vibrations of the machine are produced by the component defect. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of evaluating a frequency domain spectrum of vibration data comprising:
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defining a first fundamental frequency;
defining a series of harmonics of said first fundamental frequency;
summing a first set of amplitudes associated with said first fundamental frequency and at least some of said harmonics to produce a value K;
summing a second set of amplitudes to produce a value R;
calculating a value indicative of the presence of a component defect based at least in part on said first and second sums. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of identifying the presence of a component defect in a machine subject to vibrations, the method comprising:
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estimating from frequency domain vibration data a value R indicative of the spectral energy of said vibrations;
estimating from said frequency domain vibration data a value K indicative of harmonically related spectral energy associated with said component defect;
deriving a harmonic activity index based at least in part on the estimated values K and R; and
determining the presence of said component defect based at least in part on the value of said harmonic activity index. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A system for identifying the presence of a component defect in a machine subject to vibrations, the system comprising:
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a data storage module that receives and stores data indicative of amplitudes of vibrations of said machine at selected frequencies;
a data analyzer module, in communication with said data storage module, that derives a harmonic activity index, wherein said data analyzer comprises computer instructions operative for;
estimating from said data a value R indicative of the spectral energy of said vibrations;
estimating from said data a value K indicative of the spectral energy associated with said component defect;
deriving said harmonic activity index based at least in part on the estimated values K and R; and
determining the presence of said component defect based at least in part on the value of said harmonic activity index. - View Dependent Claims (31, 32, 33)
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34. A system for identifying the presence of a component defect in a machine subject to vibrations, the method comprising:
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means for receiving data indicative of amplitudes and corresponding frequencies of vibrations of said machine;
means for estimating from said data a value R indicative of the spectral energy of said vibrations;
means for estimating from said data a value K indicative of the spectral energy associated with said component defect, wherein estimating K is based at least in part on adding a plurality of amplitudes corresponding to a harmonic series of the fundamental frequency of said component defect means for deriving a harmonic activity index based at least in part on the estimated values K and R; and
means for determining the presence of said component defect based at least in part on the value of said harmonic activity index.
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Specification