Closed Loop Control of an Afterburning F100 Gas Turbine Engine

The paper describes the development of a nonlinear multivariable closed loop control for the F100 augmented (afterburning) engine using transfer function synthesis theory and a multivariable approach. The study addresses the following issues: (1) development of a control for the augmented F100 engine which controls the complete engine in a closed loop manner, (2) extension of controller authority to the entire thrust range, and (3) demonstration of the controller´s ability to minimize fan stall problems. A 15th order nonlinear F100 afterburning engine simulation is used as the plant for which a full range nonlinear transfer function controller is generated. Linear feedforward elements generated by the synthesis procedure assist the basic nonlinear closed loop controller to provide desired system response while maintaining engine input and output variables within physical position and rate constraints.