Optimal State-Space Control of a Gas Turbine Engine

[+] Author and Article Information
J. W. Watts, T. E. Dwan, C. G. Brockus

Weapons and Systems Engineering Department, U.S. Naval Academy, Annapolis, MD 21402

J. Eng. Gas Turbines Power 114(4), 763-767 (Oct 01, 1992) (5 pages) doi:10.1115/1.2906654 History: Received March 04, 1991; Online April 24, 2008


An analog fuel control for a gas turbine engine was compared with several state-space derived fuel controls. A single-spool, simple cycle gas turbine engine was modeled using ACSL (high level simulation language based on FORTRAN). The model included an analog fuel control representative of existing commercial fuel controls. The ACSL model was stripped of nonessential states to produce an eight-state linear state-space model of the engine. The A, B, and C matrices, derived from rated operating conditions, were used to obtain feedback control gains by the following methods: (1) state feedback; (2) LQR theory; (3) Bellman method; and (4) polygonal search. An off-load transient followed by an on-load transient was run for each of these fuel controls. The transient curves obtained were used to compare the state-space fuel controls with the analog fuel control. The state-space fuel controls did better than the analog control.

Copyright © 1992 by The American Society of Mechanical Engineers
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