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US6370957B1 Expired / Lapsed US ⏱️ 0.0 years remaining

Vibration analysis for predictive maintenance of rotating machines

Assignee: Schneider Electric USA Inc
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Filing: 1999-12-31
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Granted: 2002-04-16
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Expires: 2019-12-31
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Abstract

Abstract A method for determining the operational condition of a rotary machine is disclosed. The method comprises the steps of monitoring the machine under a baseline operating condition and collecting baseline vibrational data. A preselected number of baseline parameters are calculated from the baseline vibrational data. Next, a first baseline operational indicator is calculated from the baseline parameters, and the baseline parameters and the first baseline operational indicator are stored in a memory location. The machine is then monitored under a subsequent operating condition, and subsequent vibrational data is collected during the subsequent operating condition. A preselected number of subsequent operating parameters is calculated from the subsequent vibrational data, and a first subsequent operational indicator is calculated from the preselected number of subsequent operating parameters. Finally, the baseline data is compared to the subsequent operating data to determine the condition of the machine.

Inventors

  • 👤 Alexander Filippenko
  • 👤 Scott Brown
  • 👤 Alan Neal

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 20:49
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/12; G01H; G01H1/00; G01H1/003; G01M13/00; G01M13/02; G01M13/028

Claims Analysis

Total Claims: 22
Claim 1
Independent Claim 188 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of: monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating a preselected number of baseline parameters from the baseline vibrational data; calculating a first baseline operational indicator from the baseline parameters; storing the baseline parameters and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating a preselected number of subsequent operating parameters from the subsequent vibrational data; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameters; comparing the preselected number of subsequent operating parameters to the preselected number of baseline parameters wherein a difference between the subsequent parameters and the baseline parameters provides an indication of a mechanical problem exhibited by the machine; and comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine.
Claim 2
Independent Claim 188 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of: monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating a preselected number of baseline parameters from the baseline vibrational data; calculating a first baseline operational indicator from the baseline parameters; storing the baseline parameters and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating a preselected number of subsequent operating parameters from the subsequent vibrational data; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameters; comparing the preselected number of subsequent operating parameters to the preselected number of baseline parameters wherein a difference between the subsequent parameters and the baseline parameters provides an indication of a mechanical problem exhibited by the machine; and comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine.
Claim 3
Dependent Claim 20 words
The method of claim 1 , wherein the first type of mechanical problem is an overall vibration of the machine.
Claim 4
Dependent Claim 86 words
The method of claim 2 further comprising the steps of: calculating a second baseline operational indicator from the baseline parameters; storing the second baseline operational indicator in a memory location; calculating a second subsequent operational indicator from the preselected number of subsequent operating parameters; and comparing the second subsequent operational indicator to the second baseline operational indicator wherein a difference between the second subsequent operational indicator and the second baseline operational indicator provides an indication of a second type of mechanical problem exhibited by the machine.
Claim 5
Dependent Claim 17 words
The method of claim 3 , wherein the second type of mechanical problem is a bearing condition.
Claim 6
Dependent Claim 45 words
The method of claim 1 wherein the collecting baseline vibrational data step includes transforming the baseline vibrational data from time domain to complex frequency domain, and the collecting subsequent vibrational data step includes transforming the subsequent vibrational data from time domain to complex frequency domain.
Claim 7
Dependent Claim 43 words
The method of claim 1 , wherein the preselected number of baseline parameters and the preselected number of subsequent parameters comprise high frequency enveloping, acceleration root mean square, kurtosis, averaged spectrum changes, low frequency relative change, low frequency absolute change, and crest factor.
Claim 8
Dependent Claim 20 words
The method of claim 1 further comprising the step of comparing the subsequent vibrational data to an industry standard value.
Claim 9
Dependent Claim 22 words
The method of claim 1 wherein the baseline parameters and the first baseline operational indicator are stored in a read-only memory device.
Claim 10
Dependent Claim 18 words
The method of claim 1 wherein the calculating steps and the comparing steps are performed by a microprocessor.
Claim 11
Independent Claim 199 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of, monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating values from the baseline vibrational data for a preselected number of baseline parameters; calculating a first baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating values from the subsequent vibrational data for a preselected number of subsequent operating parameters; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameter values; comparing the preselected number of subsequent operating parameter values to the preselected number of baseline parameter values wherein a difference between the subsequent parameter values and the baseline parameter values provides an indication of a mechanical problem exhibited by the machine; and comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine.
Claim 12
Independent Claim 199 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of, monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating values from the baseline vibrational data for a preselected number of baseline parameters; calculating a first baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating values from the subsequent vibrational data for a preselected number of subsequent operating parameters; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameter values; comparing the preselected number of subsequent operating parameter values to the preselected number of baseline parameter values wherein a difference between the subsequent parameter values and the baseline parameter values provides an indication of a mechanical problem exhibited by the machine; and comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine.
Claim 13
Dependent Claim 20 words
The method of claim 10 , wherein the first type of mechanical problem is an overall vibration of the machine.
Claim 14
Dependent Claim 86 words
The method of claim 10 further comprising the steps of: calculating a second baseline operational indicator from the baseline parameters; storing the second baseline operational indicator in a memory location; calculating a second subsequent operational indicator from the preselected number of subsequent operating parameters; and comparing the second subsequent operational indicator to the second baseline operational indicator wherein a difference between the second subsequent operational indicator and the second baseline operational indicator provides an indication of a second type of mechanical problem exhibited by the machine.
Claim 15
Dependent Claim 17 words
The method of claim 12 , wherein the second type of mechanical problem is a bearing condition.
Claim 16
Dependent Claim 43 words
The method of claim 10 , wherein the preselected number of baseline parameters and the preselected number of subsequent parameters comprise high frequency enveloping, acceleration root mean square, kurtosis, averaged spectrum changes, low frequency relative change, low frequency absolute change, and crest factor.
Claim 17
Dependent Claim 19 words
The method of claim 10 further comprising the step of comparing the subsequent vibrational data an industry standard value.
Claim 18
Independent Claim 281 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of: monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating values from the baseline vibrational data for a preselected number of baseline parameters; calculating a first baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; calculating a second baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating values from the subsequent vibrational data for a preselected number of subsequent operating parameters; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameter values; calculating a second subsequent operational indicator from the preselected number of subsequent operating parameter values; comparing the preselected number of subsequent operating parameter values to the preselected number of baseline parameter values wherein a difference between the subsequent parameter values and the baseline parameter values provides an indication of a mechanical problem exhibited by the machine; comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine; and comparing the second subsequent operational indicator to the second baseline operational indicator wherein a difference between the second subsequent operational indicator and the second baseline operational indicator provides an indication of a second type of mechanical problem exhibited by the machine.
Claim 19
Independent Claim 281 words
A method for determining the operational condition of a rotary machine, the method comprising the steps of: monitoring the machine under a baseline operating condition; collecting baseline vibrational data; calculating values from the baseline vibrational data for a preselected number of baseline parameters; calculating a first baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; calculating a second baseline operational indicator from the baseline parameter values; storing the baseline parameter values and the first baseline operational indicator in a memory location; monitoring the machine under a subsequent operating condition; collecting subsequent vibrational data during the subsequent operating condition; calculating values from the subsequent vibrational data for a preselected number of subsequent operating parameters; calculating a first subsequent operational indicator from the preselected number of subsequent operating parameter values; calculating a second subsequent operational indicator from the preselected number of subsequent operating parameter values; comparing the preselected number of subsequent operating parameter values to the preselected number of baseline parameter values wherein a difference between the subsequent parameter values and the baseline parameter values provides an indication of a mechanical problem exhibited by the machine; comparing the first subsequent operational indicator to the first baseline operational indicator wherein a difference between the first subsequent operational indicator and the first baseline operational indicator provides an indication of a first type of mechanical problem exhibited by the machine; and comparing the second subsequent operational indicator to the second baseline operational indicator wherein a difference between the second subsequent operational indicator and the second baseline operational indicator provides an indication of a second type of mechanical problem exhibited by the machine.
Claim 20
Dependent Claim 20 words
The method of claim 16 , wherein the first type of mechanical problem is an overall vibration of the machine.
Claim 21
Dependent Claim 17 words
The method of claim 16 , wherein the second type of mechanical problem is a bearing condition.
Claim 22
Dependent Claim 43 words
The method of claim 16 , wherein the preselected number of baseline parameters and the preselected number of subsequent parameters comprise high frequency enveloping, acceleration root mean square, kurtosis, averaged spectrum changes, low frequency relative change, low frequency absolute change, and crest factor.

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2005-04-15 2005-10-15 2006-04-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2009-04-15 2009-10-15 2010-04-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2013-04-15 2013-10-15 2014-04-16 $7700.00 Window Closed / Lapsed

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