TY - JOUR
T1 - Adaptive control of combustion instability with on-line system identification
AU - Koshigoe, Shozo
AU - Komatsuzaki, Toshihiko
AU - Yang, Vigor
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - In this study, an adaptive control system is developed for suppressing pressure oscillations in a generic combustor, where the unsteady flowfield associated with the combustion instability is described by a nonlinear inhomogeneous wave equation. Control action is achieved by injecting auxiliary liquid fuel, and is modeled as an array of time-delayed combustion sources. The adaptive controller employs on-line system identification (SID) for robustness with respect to transient operating states, modeling uncertainties, external disturbances, and additional modes of instability that may arise in the course of control. Comparisons are made between the adaptive controller and a previously developed proportional-plus-integral (PI) controller, in terms of performance (degree of oscillation suppression, and speed with which oscillations are damped), robustness against plant parameter changes (particularly unknown factors of the auxiliary characteristics), and control-fuel mass expenditure. The adaptive controller exhibits good performance with a clear advantage over the PI controller in robustness. Also, the adaptive controller with on-line SID stabilizes the pressure oscillations without exciting additional mode(s).
AB - In this study, an adaptive control system is developed for suppressing pressure oscillations in a generic combustor, where the unsteady flowfield associated with the combustion instability is described by a nonlinear inhomogeneous wave equation. Control action is achieved by injecting auxiliary liquid fuel, and is modeled as an array of time-delayed combustion sources. The adaptive controller employs on-line system identification (SID) for robustness with respect to transient operating states, modeling uncertainties, external disturbances, and additional modes of instability that may arise in the course of control. Comparisons are made between the adaptive controller and a previously developed proportional-plus-integral (PI) controller, in terms of performance (degree of oscillation suppression, and speed with which oscillations are damped), robustness against plant parameter changes (particularly unknown factors of the auxiliary characteristics), and control-fuel mass expenditure. The adaptive controller exhibits good performance with a clear advantage over the PI controller in robustness. Also, the adaptive controller with on-line SID stabilizes the pressure oscillations without exciting additional mode(s).
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U2 - 10.2514/2.5456
DO - 10.2514/2.5456
M3 - Article
AN - SCOPUS:0033131537
VL - 15
SP - 383
EP - 389
JO - Journal of Propulsion and Power
JF - Journal of Propulsion and Power
SN - 0748-4658
IS - 3
ER -