US6522991B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suppressing oscillations in processes such as gas turbine combustion
Assignee: RTX Corp
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Filing: 2001-05-04
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Granted: 2003-02-18
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Expires: 2021-05-04
Abstract
Abstract A frequency tracking extended Kalman filter (35), responsive to combustor pressure (30), produces in-phase (36) and quadrature (37) components of the estimated magnitude of the undesirable combustor pressure variations, for which compensation is to be achieved; a bidirectional minimum-seeking algorithm (41) is used to select the phase (42) of a process adjusting input variable (28), such as fuel that is in addition to the main fuel flow used for power control purposes.
Inventors
- 👤 Andrzej Banaszuk
- 👤 Youping Zhang
- 👤 Clas A. Jacobson
- 👤 Miroslav Krstic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:30
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/16; F23R; F23R3/00; F05; F05B; F05B2260/00; F05B2260/96; F23N2223/00; F23N2223/44; F23R2900/00; F23R2900/00013; F23R2900/00014
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
A method of minimizing the magnitude of a parameter of a dynamic process, the magnitude of said parameter being (a) responsive to a process adjusting input variable applied to said process and (b) varying essentially sinusoidally with time, said method comprising: (A) measuring said parameter and providing a parameter signal indicative thereof; (B) applying said parameter signal to an observer to provide signals indicative of the in-phase and quadrature components and magnitude of said parameter signal; (C) providing, in response to said in-phase, quadrature and magnitude signals, a phase signal indicative of the phase of said process adjusting input variable required to reduce the magnitude of said parameter; (D) providing a control signal as a function of said inphase and quadrature signals and said phase signal to control said process adjusting input variable; and (E) controlling said process adjusting input variable as a function of said control signal.
Claim 2
Independent Claim
148 words
A method of minimizing the magnitude of a parameter of a dynamic process, the magnitude of said parameter being (a) responsive to a process adjusting input variable applied to said process and (b) varying essentially sinusoidally with time, said method comprising: (A) measuring said parameter and providing a parameter signal indicative thereof; (B) applying said parameter signal to an observer to provide signals indicative of the in-phase and quadrature components and magnitude of said parameter signal; (C) providing, in response to said in-phase, quadrature and magnitude signals, a phase signal indicative of the phase of said process adjusting input variable required to reduce the magnitude of said parameter; (D) providing a control signal as a function of said inphase and quadrature signals and said phase signal to control said process adjusting input variable; and (E) controlling said process adjusting input variable as a function of said control signal.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein: said steps (A)-(D) are performed continuously throughout said process.
Claim 4
Dependent Claim
105 words
A method according to claim 1 wherein: at least a process controlling input variable for said process is adjustable to provide a selected performance resulting from said process; and further comprising as initialization: subjecting said process to at least a range of said process controlling input variable; performing said steps (A)-(D) as said process responds to said range of said process controlling input variable and recording corresponding values of said control signal; and further comprising, during normal operation: performing said steps (D) and (E) using said recorded values of said control signal selected to correspond with respective current values of said process controlling input variable.
Claim 5
Dependent Claim
21 words
A method according to claim 3 wherein: said process adjusting input variable is the same as said process controlling input variable.
Claim 6
Dependent Claim
38 words
A method according to claim 1 wherein: the frequency of said parameter varies as a function of at least said process controlling input variable; and said step (B) comprises applying said parameter signal to a frequency tracking observer.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein: said step (B) comprises applying said parameter signal to a Kalman filter.
Claim 8
Dependent Claim
22 words
A method according to claim 6 wherein: said step (B) comprises applying said parameter signal to a frequency tracking extended Kalman filter.
Claim 9
Dependent Claim
26 words
A method according to claim 1 wherein: said process is combustion of fuel, said parameter is combustor pressure, and said process adjusting input variable is fuel.
Claim 10
Dependent Claim
20 words
A method according to claim 8 wherein: said process is combustion of fuel in an axial flow gas turbine engine.
Claim 11
Dependent Claim
18 words
A method according to claim 8 wherein: said process is combustion of fuel in an aircraft thrust augmenter.
Claim 12
Dependent Claim
14 words
A method according to claim 7 wherein: said process controlling input variable is fuel.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-02-17 | 2006-08-19 | 2007-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-02-17 | 2010-08-19 | 2011-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-02-17 | 2014-08-19 | 2015-02-18 | $7700.00 | Window Closed / Lapsed |