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1.0 Introduction and Model Description
The development of a state-space fuel control on a singleshaft, simple cycle gas turbine engine is the subject of this paper. A model of this simple engine with analog fuel control was available. The load transients of this model have been compared with actual load transients and found to be accurate. This verified model becomes a tool for developing multimode state-space controllers for more complicated engines. For example, a possible future high-efficiency engine for powering naval ships is an intercooled, regenerated (ICR) gas turbine engine , The control for this future engine will involve monitoring several outputs and will have three to five inputs. The number of inputs will vary with the mode of operation. A computer in the control loop will allow for many sophisticated modes and, also, allow for improvements in control strategy after initial development and even after installation. Fuel controls for future engines will be developed and verified with this simpler engine model as a tool.
3.0 Summary and Conclusions
Several different schemes for arriving at controllers for a gas turbine engine have been investigated. An analog model programmed in ACSL was used to develop a linearized statespace representation for use in MATLAB. The different approaches for obtaining feedback gains and the results from each set of gains are presented. The approaches are: state feedback, LQR, Bellman, and polygonal search.
The state-space approach to developing controllers is a viable one for simulations of this size and larger. In particular, multiinput, multimode fuel controllers are readily adaptable to this approach.
No comparison hasbeen attempted to analyze which of these state-space approaches is the "best" other than a graphical comparison of the controller in action. Much research of the seemingly endless variations in these methods needs to be conducted.