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Nonlinear Analysis of Controlled Combustion Processes
Special Events| Speaker: | Andrzej Banaszuk, United Technologies Research Center |
| Location: | 2130 Bainer Hall |
| Start time: | Thu, Aug 19 1999, 2:00PM |
Description
n overview of UTRC work in modeling and active control of combustion will
be presented. A simplified version of UTRC model for a single acoustic mode
has a form of a feedback interconnection of a lightly damped linear 2nd
order system, and a nonlinear heat release model involving a saturation
nonlinearity and transport delay. The model includes a stochastic
disturbance modeling effect of turbulent flow. Analysis predicts that the
delay can lead to destabilization of the loop and results in a
limit-cycling behavior. The results of analysis using a reduced-order model
and experiments with active control using fuel modulation motivated a study
of what performance is achievable using active control. Limitations due to
unstable eigenvalues, delay, disturbances, and limited actuator authority
and bandwidth are studied. Models involving noisy limit cycles are studied
using random input describing function analysis. Other emerging challenges
for modeling and control of combustion processes involve mixing enhancement
with active control. Methods of control theory and dynamical system theory
are used to enhance chaotic dynamics beneficial to mixing.
Andrzej Banaszuk Research Engineer Dynamical Systems an Control United
Technologies Research Center Phone: 860-610-7381
Fax: 860-610-7909 banasza@utrc.utc.com