Machine diagnostic system and method for vibration analysis
First Claim
1. A diagnostic system for a dynamoelectric machine, comprising:
- at least one vibration sensor mounted on the machine to sense vibration; and
a processor adapted to receive a vibration signal from the at least one vibration sensor, the processor scanning a vibration signature corresponding to the vibration signal over a series of frequencies to identify a resonant frequency for a transmission path from a vibration source to the at least one vibration sensor and to evaluate the vibration signature in the vicinity of the resonant frequency to determine an operating state of the machine.
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Abstract
A diagnostic system includes a vibration sensor mounted on a machine to measure vibrations. Vibration signals from the sensor are processed and analyzed by the system. From a known critical frequency of a vibration-generating component, the system measures the amplitude of the vibration signal at more than one harmonic frequency of the known critical frequency and compares the amplitudes to amplitudes at adjacent harmonic frequencies. When a relatively large amplitude is found at a harmonic frequency, that is a harmonic frequency near a resonant frequency of the physical path between the vibration sensor and the vibration-generating component, the system analyzes the shape and magnitude of the vibration signal around that harmonic frequency to evaluate the condition of the machine.
230 Citations
32 Claims
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1. A diagnostic system for a dynamoelectric machine, comprising:
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at least one vibration sensor mounted on the machine to sense vibration; and
a processor adapted to receive a vibration signal from the at least one vibration sensor, the processor scanning a vibration signature corresponding to the vibration signal over a series of frequencies to identify a resonant frequency for a transmission path from a vibration source to the at least one vibration sensor and to evaluate the vibration signature in the vicinity of the resonant frequency to determine an operating state of the machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of analyzing a vibration signature of a dynamoelectric machine, comprising the steps of:
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obtaining the vibration signature from a vibration sensor connected to the machine;
processing the vibration signature by determining an approximate resonant frequency of a vibration transmission path from a vibration source of the machine to the vibration sensor; and
scanning a frequency region adjacent the approximate resonant frequency for harmonic frequencies of the vibration source of the machine having a relatively large amplitude; and
determining a condition of the machine from characteristics of the vibration signal at the harmonic frequencies having a relatively large amplitude. - View Dependent Claims (14, 15, 16, 17)
determining at least one critical frequency of a vibration-generating component of the machine.
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15. The method of claim 13 further including the step of identifying harmonic frequencies of the at least one critical frequency.
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16. The method of claim 13 further including the step of recording amplitudes of the vibration signature at harmonic frequencies.
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17. The method of claim 16 further including the step of comparing the recorded amplitudes to identify a resonant frequency associated with a sudden increase in amplitude.
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18. A dynamoelectric machine diagnostic system, comprising:
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at least one vibration sensor mounted on a dynamoelectric machine to sense a vibration signature; and
a processor adapted to receive the vibration signature from the at least one vibration sensor, the processor scanning the vibration signature over a series of harmonic frequencies of a critical frequency to identify a resonant frequency for a transmission path from a vibration source to the vibration sensor and evaluating the vibration signature in a frequency region near the resonant frequency to facilitate determining an operating condition of the machine. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A dynamoelectric machine diagnostic system, comprising:
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means for sensing a vibration signature mounted on a dynamoelectric machine; and
means for scanning the vibration signature over a series of frequencies to identify a resonant frequency for a transmission path from a vibration source to the means for sensing a vibration signature. - View Dependent Claims (31)
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32. A diagnostic system for a dynamoelectric machine, comprising:
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at least one vibration sensor mounted on the machine to sense vibration; and
a processor adapted to receive a vibration signal from the vibration sensor and generate a vibration signature corresponding to the vibration signal, the processor scanning the vibration signature over a series of frequencies to identify a resonant frequency for a transmission path from a vibration source to the at least one vibration sensor and to evaluate the vibration signature in the vicinity of the resonant frequency, the processor comparing the identified resonant frequency with an expected resonant frequency in determining an operating condition of the machine.
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Specification