US3733892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous vibrational analyzer for rotating machinery
Assignee: Northrop Grumman Corp
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Filing: 1972-04-03
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Granted: 1973-05-22
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Expires: 1992-04-03
Abstract
Abstract A pulse signal is generated which is a precise multiple of the rotation frequency of a machine to be tested. A sensor is utilized to generate an electrical signal in accordance with vibration developed in the machine with its rotation. Low frequency components of this signal are filtered out therefrom and these filtered signals fed to a pair of switching circuits. The pulse signals in accordance with the rotation of the machine are fed to a switching signal generator where quadrature related signals synchronized with the machine rotation are developed. These quadrature related signals are fed to the switching circuits as the switching control therefor, so as to provide samplings of the vibration signals in quadrature relationship. The outputs of the switching circuits are each integrated and squared, the squared signals then being summed. These summed output signals are then fed to an indicator which provides the indication of the amplitude of vibrational components at the machine rotation frequency or a harmonic thereof.
Inventors
- 👤 L Rennick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:36
CPC Classifications
G; G01; G01H; G01H1/00; G01H1/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
In a system for measuring the amplitude of vibrational energy developed in a machine at a frequency having a predetermined harmonic relationship to the rotation frequency of the machine, comprising: means for generating a pulse signal in accordance with the rotation frequency of the machine, means for generating an electrical signal in accordance with the vibration of the machine during rotation thereof, said electrical signal including the vibrational energy to be measured, frequency multiplier means for multiplying the pulse signal by a factor in accordance with the harmonic relationship between the component to be measured and the machine rotation frequency, switching signal generator means responsive to the multiplied pulse signal for generating quadrature related signals at the frequency of the signal component to be measured, separate switching circuit means, each for receiving one of said quadrature related signals as a switching control signal therefor, said switching circuit means both receiving the electrical signal in accordance with machine vibration, means for integrating the outputs of each of said switching circuit means, means for squaring the outputs of each of said integrating means, means for summing the outputs of said squaring means, and means for indicating the output of said summing means.
Claim 2
Dependent Claim
200 words
In a system for measuring the amplitude of vibrational energy developed in a machine at a frequency having a predetermined harmonic relationship to the rotation frequency of the machine, comprising: means for generating a pulse signal in accordance with the rotation frequency of the machine, means for generating an electrical signal in accordance with the vibration of the machine during rotation thereof, said electrical signal including the vibrational energy to be measured, frequency multiplier means for multiplying the pulse signal by a factor in accordance with the harmonic relationship between the component to be measured and the machine rotation frequency, switching signal generator means responsive to the multiplied pulse signal for generating quadrature related signals at the frequency of the signal component to be measured, separate switching circuit means, each for receiving one of said quadrature related signals as a switching control signal therefor, said switching circuit means both receiving the electrical signal in accordance with machine vibration, means for integrating the outputs of each of said switching circuit means, means for squaring the outputs of each of said integrating means, means for summing the outputs of said squaring means, and means for indicating the output of said summing means.
Claim 3
Dependent Claim
28 words
The system of claim 1 wherein said component to be measured is at the rotation frequency of the machine, the multiplication factor of said multiplying means being 4.
Claim 4
Dependent Claim
26 words
The system of claim 1 and further including integration timer means for controlling the time intervals during which the signals are integrated by said integrator means.
Claim 5
Dependent Claim
39 words
The system of claim 1 and further including a low pass filter for passing only components in the vibration signal which are no greater in frequency than that of the second harmonic of the rotation frequency of the machine.
Claim 6
Independent Claim
179 words
A system for measuring the magnitude of a vibration component of the vibrational energy generated by a rotating machine, said component having a frequency harmonically related to the rotation frequency of said machine, comprising: means for generating a pulse signal in accordance with the rotaTing frequency of the machine, means responsive to said pulse signal for generating a pair of quadrature related signals at the frequency of machine rotation, means for generating an electrical signal representing the vibrational energy developed by said machine during its rotation, separate switch means, each responsive to a separate one of said quadrature related signals for switching the electrical signal representing the vibrational energy, means for integrating the outputs of each of said switching means, means for squaring the output of each of said integrator means, means for summing the outputs of said squaring means, and indicator means for receiving the output of said summing means and providing an indication of the magnitude thereof, whereby vibrational energy other than at the frequency of said vibration component is effectively zeroed out in said integrator means.
Claim 7
Independent Claim
179 words
A system for measuring the magnitude of a vibration component of the vibrational energy generated by a rotating machine, said component having a frequency harmonically related to the rotation frequency of said machine, comprising: means for generating a pulse signal in accordance with the rotaTing frequency of the machine, means responsive to said pulse signal for generating a pair of quadrature related signals at the frequency of machine rotation, means for generating an electrical signal representing the vibrational energy developed by said machine during its rotation, separate switch means, each responsive to a separate one of said quadrature related signals for switching the electrical signal representing the vibrational energy, means for integrating the outputs of each of said switching means, means for squaring the output of each of said integrator means, means for summing the outputs of said squaring means, and indicator means for receiving the output of said summing means and providing an indication of the magnitude thereof, whereby vibrational energy other than at the frequency of said vibration component is effectively zeroed out in said integrator means.
Claim 8
Dependent Claim
19 words
The system of claim 5 and further including integration timer means for controlling the time duration of said integration.
Claim 9
Dependent Claim
53 words
The system of claim 5 wherein said means for generating a pulse signal comprises means for generating a pulse output at the rotation frequency, and frequency multiplier means for multiplying the pulse output by a factor in accordance with the harmonic relationship between the component to be measured and the machine rotation frequency.
Claim 10
Dependent Claim
32 words
The system of claim 7 wherein said frequency component to be measured is at the frequency of the rotation of said machine, the multiplication factor of said frequency multiplier means being 4.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |