| As the power source of the airplane,the air engine system plays an important role in the whole plane system,and the engine control system is the necessary insurance to keep the engine running safely and effectively. The system can make the engine run safely in any environment and situation, and make full use of its power. And the model development of the engine is an important and effective method to study the control law or system with low consumption and short cycle.Focusing on the fuel control law of the small size turbofan engine DGEN380, a steady and transient component-level mathematical model was developed and simulated on MATLAB platform with analytic method. A special tool was used to get the parameters of the maps of the rotating parts(fan, compressor, turbine) during the model development, so as to draw the new maps which can show the operating point/line of the engine.In the steady model simulation process, the Newton-Raphson method and Genetic Algorithm were evaluated and compared for solving the working equations of the engine.Some common problems were described and solved during the simulation. The basic model was modified to overcome the limitations of simulation in the Genetic Algorithm, so as to has higher precision and computational speed for sovling the nonlinear working equations. The fuel control law in steady state was studied. The Euler method was used to calculate the differential term for the transient model simulation and fuel control law study.Considering the engine control principles and design features, the fuel control system was introduced briefly, and the fuel control law was studied basing on the model. The altitude characteristic was also described as an example. The experimental results show that the N-R method has high accuracy and speed for solving the engine working equation, while the Genetic Algorithm has better adaptability with the model modification. The simulation results of the model and the control law fit the test data and theory well. |
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