초록 ▼

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 algori

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.

대표청구항 ▼

1. 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

1. 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. 2. A method according to claim 1 wherein: said steps (A)-(D) are performed continuously throughout said process. 3. 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. 4. A method according to claim 3 wherein: said process adjusting input variable is the same as said process controlling input variable. 5. 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. 6. A method according to claim 1 wherein: said step (B) comprises applying said parameter signal to a Kalman filter. 7. A method according to claim 6 wherein: said step (B) comprises applying said parameter signal to a frequency tracking extended Kalman filter. 8. 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. 9. A method according to claim 8 wherein: said process is combustion of fuel in an axial flow gas turbine engine. 10. A method according to claim 8 wherein: said process is combustion of fuel in an aircraft thrust augmenter. 11. A method according to claim 7 wherein: said process controlling input variable is fuel.