The fuel flowrate and air flow direction are the main parameters affecting the gas turbine engine performance. The fuel management system is a full authority digital electronic computing control system. It positions the inlet guide vanes (IGV), power turbine stators (PTS) and meters fuel flow to the engine through fuel metering system (FMS) to obtain optimum performance. The system consists of two control units that must work in conjunction with each other. These units are the electro-mechanical fuel system (EMFS) and the digital electronic control unit (DECU). One of the most important and challenging concerns of engine design and control is driving a valid model for the EMFS with its three subsystems. Physics-based, black box and grey box models are used in driving a model for any system. In this paper
a physics-based model for IGV and PTS systems have been estimated and validated using SIMULINK. As it is very hard
to model the electrohydraulic FMS because of its complicity and integrity. It is preferred to treat the system as a black box. So, a model for an electrohydraulic FMS has been estimated and validated using MATLAB system identification toolbox (SIT). The driven model has been validated using a different measured data set to insure a good representation of the physical system. Results show that the obtained model follows the real system with good accuracy.