US3677072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damage detection method and apparatus for machine elements utilizing vibrations therefrom
Assignee: General Electric Co
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Filing: 1970-10-30
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Granted: 1972-07-18
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Expires: 1990-10-30
Abstract
Abstract A system for detection of damage to a machine element in rolling engagement with another machine element utilizing vibrations produced by such damage. The peak value of the vibration signal obtained from the machine elements is compared with the mean value of the rectified vibration signal to obtain a ratio which is an indication of and the extent of the damage to the machine element.
Inventors
- 👤 Bjorn Weichbrodt
- 👤 Bernard Darrel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:20
CPC Classifications
G; G01; G01M; G01M13/00; G01M13/02; G01M13/028; F; F16; F16C; F16C19/00; F16C19/52; F16C19/527; G01H; G01H1/00; G01H1/003; G01M13/021; G01M13/04; G01M13/045; F16C19/02; F16C19/04; F16C19/06; G01N; G01N2291/00; G01N2291/26; G01N2291/269; G01N2291/2696
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
A system for detecting damage to a rolling element in a pair of engaging rolling elements, said damage producing a component of vibration having a periodicity corresponding to the periodicity of rotation of said rolling element and having a peak above the level of other vibrations of said rolling elements, a vibration sensor coupled to said rolling element for sensing the vibrations thereof and converting said vibrations into a first electrical signal, means for deriving a second signal from said first signal corresponding to the peak value of said first electrical signal, means for deriving a third signal from said first signal corresponding to a mean value of the amplitude of said electrical signal, means for deriving a signal corresponding to the ratio of the amplitudes of said second signal and said third signal, and indicator means responsive to a predetermined level of said third signal corresponding to said peak of said component of vibration, whereby said damage is detected.
Claim 2
Independent Claim
160 words
A system for detecting damage to a rolling element in a pair of engaging rolling elements, said damage producing a component of vibration having a periodicity corresponding to the periodicity of rotation of said rolling element and having a peak above the level of other vibrations of said rolling elements, a vibration sensor coupled to said rolling element for sensing the vibrations thereof and converting said vibrations into a first electrical signal, means for deriving a second signal from said first signal corresponding to the peak value of said first electrical signal, means for deriving a third signal from said first signal corresponding to a mean value of the amplitude of said electrical signal, means for deriving a signal corresponding to the ratio of the amplitudes of said second signal and said third signal, and indicator means responsive to a predetermined level of said third signal corresponding to said peak of said component of vibration, whereby said damage is detected.
Claim 3
Dependent Claim
30 words
The combination of claim 1 in which signal enhancement means are provided to enhAnce the amplitude of the component of vibration in relation to the amplitude of the other vibrations.
Claim 4
Dependent Claim
17 words
The combination of claim 1 in which said rolling element is a rolling element of a bearing.
Claim 5
Dependent Claim
32 words
The combination of claim 1 in which said pair of rolling elements are gears in which the teeth of one of said gears engage the teeth of the other of said gears.
Claim 6
Dependent Claim
32 words
The combination of claim 1 in which said means for deriving a third signal derives a mean value signal corresponding to the average value of the rectification of said first electrical signal.
Claim 7
Dependent Claim
31 words
The combination of claim 1 in which said means for deriving a third signal derives a mean value signal corresponding to the root mean square value of said first electrical signal.
Claim 8
Dependent Claim
45 words
The combination of claim 1 in which a network is interfaced in the signal path from said means deriving said third signal to said indicator means, the time constant of said network being large in relation to the period of rotation of said rolling element.
References Cited (Backward Citations)
US3095730A
Cited
US3486616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |