US5412985A
Expired / Lapsed
US
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System and method for ratiometrically processing sensed speed and vibration signals for a non-uniformly rotating body
Assignee: Ametek Inc
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Filing: 1992-09-18
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Granted: 1995-05-09
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Expires: 2012-09-18
Abstract
Abstract A digital ratiometric tracking filter provides superior measurement of the magnitude and phase of vibration of a rotating body, at uniform or non-uniform rotational speed. The sensed speed and vibration signals are concurrently processed and subsequently combined to produce the absolute magnitude and relative phase measurements. The concurrent processing of the sensed signals assures that any system-introduced errors are found in both signals and can be uniformly eliminated by the ratiometric processing thereof.
Inventors
- 👤 David L. Garcia
- 👤 Robert G. Bianchi
- 👤 Robert J. Hueston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:17
CPC Classifications
G; G01; G01H; G01H1/00; G01H1/003; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/22; G01M7/00; G01M7/02; G01M7/025
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
67 words
A method for characterizing the vibration of a rotating body comprising the steps of: monitoring vibration signals during a measurement period; asynchronously monitoring rotational speed signals during said measurement period, simultaneously with said monitoring of vibration signals; concurrently processing said simultaneously monitored vibration and speed signals; and ratiometrically combining said vibration and speed signals to yield the absolute magnitude and relative phase of vibration of said body.
Claim 2
Independent Claim
67 words
A method for characterizing the vibration of a rotating body comprising the steps of: monitoring vibration signals during a measurement period; asynchronously monitoring rotational speed signals during said measurement period, simultaneously with said monitoring of vibration signals; concurrently processing said simultaneously monitored vibration and speed signals; and ratiometrically combining said vibration and speed signals to yield the absolute magnitude and relative phase of vibration of said body.
Claim 3
Dependent Claim
67 words
The method of claim 1 wherein said processing comprises detecting the magnitude and phase of each of said vibration and speed signals and wherein said combining step comprises combining the magnitudes of said vibration and speed signals to yield the absolute magnitude of vibration of the body and combining the phase of said vibration and speed signals to yield the relative phases of vibration of said body.
Claim 4
Dependent Claim
30 words
The method of claim 2 wherein said detecting of the magnitude of the speed signal further comprises detecting the attenuation of said magnitude at at the fundamental frequency of rotation.
Claim 5
Dependent Claim
28 words
The method of claim 3 wherein said combining of magnitudes comprises dividing the magnitude of the vibration signal by the attenuation of the magnitude of said speed signal.
Claim 6
Dependent Claim
26 words
The method of claim 2 wherein said combining of phase angles comprises subtracting said phase of said speed signal from the phase of said vibration signal.
Claim 7
Dependent Claim
22 words
The method of claim 2 wherein said processing further comprises the step of converting said vibration and speed signals to digital signals.
Claim 8
Dependent Claim
25 words
The method of claim 2 wherein said processing further comprises the step of filtering said vibration and said speed signals prior to detecting said magnitudes.
Claim 9
Dependent Claim
23 words
The method of claim 2 wherein said processing further comprises conditioning said vibration signal by converting said vibration signals into analog voltage signals.
Claim 10
Dependent Claim
36 words
The method of claim 2 wherein said processing of said speed signal comprises converting said speed signal from a time-based signal to a frequency-based speed signal which corresponds to the rotational speed of the rotating body.
Claim 11
Independent Claim
170 words
A method for characterizing the magnitude and relative phase of vibration of a rotating body comprising the steps of: sensing vibration signals during a measurement period; asynchronously sensing rotational speed signals during said measurement period simultaneously with said sensing vibration signal; and concurrently processing said vibration signals and said rotational speed signals, wherein said concurrent processing comprises converting said sensed vibration signals into analog vibration voltage signals; converting said speed signals from time-based signals to frequency based speed signals; effecting conversion of said analog vibration voltage signals and said frequency-based speed signals from analog to digital vibration and speed signals; filtering said digital vibration and speed signals; detecting the magnitudes of said digital vibration and speed signals; detecting the phases of said digital vibration and speed signals; combining said magnitudes of said digital vibration and speed signals to obtain the proportional magnitude of vibration of said rotating body; and combining said phases of said digital vibration and speed signals to obtain the relative phase of vibration of said rotating body.
Claim 12
Independent Claim
170 words
A method for characterizing the magnitude and relative phase of vibration of a rotating body comprising the steps of: sensing vibration signals during a measurement period; asynchronously sensing rotational speed signals during said measurement period simultaneously with said sensing vibration signal; and concurrently processing said vibration signals and said rotational speed signals, wherein said concurrent processing comprises converting said sensed vibration signals into analog vibration voltage signals; converting said speed signals from time-based signals to frequency based speed signals; effecting conversion of said analog vibration voltage signals and said frequency-based speed signals from analog to digital vibration and speed signals; filtering said digital vibration and speed signals; detecting the magnitudes of said digital vibration and speed signals; detecting the phases of said digital vibration and speed signals; combining said magnitudes of said digital vibration and speed signals to obtain the proportional magnitude of vibration of said rotating body; and combining said phases of said digital vibration and speed signals to obtain the relative phase of vibration of said rotating body.
Claim 13
Dependent Claim
20 words
The method for claim 10 further comprising anti-aliasing filtering of said analog vibration voltage signals and said frequency-based speed signals.
Claim 14
Dependent Claim
36 words
The method of claim 10 further comprising selecting sets of said digital vibration and speed signals for a predetermined time period and wherein only said sets of said digital vibration and speed signals are subsequently filtered.
Claim 15
Dependent Claim
49 words
The method of claim 10 further comprising obtaining the speed attentuation by dividing the magnitude of the speed signal by the speed magnitude and wherein said combining of said magnitude comprises dividing the magnitude of said vibration signal by the speed attenuation to yield the absolute magnitude of vibration.
Claim 16
Dependent Claim
25 words
The method of claim 10 wherein said combining of phases comprises subtracting the phase of said speed signal from the phase of said vibration signal.
Claim 17
Dependent Claim
15 words
The method of claim 10 wherein said combining of phases comprises performing a cross-spectrum calculation.
Claim 18
Dependent Claim
128 words
A tracking filter system for providing the amplitude and phase of vibration of a rotating body, when the rotational rate is uniform or non-uniform comprising: a first sensor for producing vibration signals; a second sensor for producing first speed signals; means for converting said vibration signals into vibration frequency signals; means for converting said first speed signals into frequency-based second speed signals; means responsive to said first speed signals for determining the magnitude of said vibration frequency signals and second speed signals; means for determining the phases of said vibration frequency signals and said second speed signals; means for combining said magnitudes to produce the magnitude of vibration of said rotating body; and means for combining said phases to produce the phase of vibration of said rotating body.
Claim 19
Dependent Claim
128 words
A tracking filter system for providing the amplitude and phase of vibration of a rotating body, when the rotational rate is uniform or non-uniform comprising: a first sensor for producing vibration signals; a second sensor for producing first speed signals; means for converting said vibration signals into vibration frequency signals; means for converting said first speed signals into frequency-based second speed signals; means responsive to said first speed signals for determining the magnitude of said vibration frequency signals and second speed signals; means for determining the phases of said vibration frequency signals and said second speed signals; means for combining said magnitudes to produce the magnitude of vibration of said rotating body; and means for combining said phases to produce the phase of vibration of said rotating body.
Claim 20
Dependent Claim
25 words
The system of claim 16 further comprising means for converting said vibration frequency signals land said second speed signals into digital vibration and speed signals.
Claim 21
Dependent Claim
17 words
The system of claim 17 wherein said means for determining the magnitudes further comprises digital filter means.
Claim 22
Dependent Claim
17 words
The system of claim 18 wherein said means for determining the phases further comprises digital filter means.
Claim 23
Dependent Claim
12 words
The system of claim 16 wherein said first sensor is an accelerometer.
Claim 24
Dependent Claim
12 words
The system of claim 16 wherein said first sensor is a velometer.
Claim 25
Dependent Claim
13 words
The system of claim 16 wherein said first sensor is a displacement sensor.
Claim 26
Dependent Claim
13 words
The system of claim 16 wherein said second sensor means is a tachometer.
Claim 27
Dependent Claim
29 words
The system of claim 16 further comprising anti-aliasing filter means associated with each of said means for converting said vibration signals and means for converting said first speed signals.
References Cited (Backward Citations)
US5089969A
Cited
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| 3.5 Years (Year 4) | 1998-05-08 | 1998-11-07 | 1999-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-08 | 2002-11-07 | 2003-05-09 | $3760.00 | Window Closed / Lapsed |
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