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Engine Model
This is a crucial subsystem for any aircraft. The power plant is a jet engine or a low bypass turbofan. The thrust attained at the equilibrium depends on the power lever angle, altitude, and Mach number. It is very important to model the engine transient response during takeoff and landing. A jet engine has three major stages: (1) the compressor, (2) the combustion chamber, and (3) the turbine stage. The intake and
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FIGURE 6.4 Shaping model for power lever angle PLAO-PLA output to access static thrust database. |
the diffuser are the other important stages. For the purpose of the flight simulator it is not necessary to use the complete nonlinear model that models all the stages of the engine. IFS it is enough to excite the engine model at sufficient points in the flight envelope and determine the time constants. Predetermined time constants and interpolations can be used during the simulation. A first-order model can be used as shown in Figure 6.4 [10,12].
