Study on the Dynamic Modeling of the Turbofan Engine
Keywords:
Turbofan Engine, Mathematical Model, Part Calculation, Dynamic ModelAbstract
The external conditions and internal parameters of aero-engine work vary widely, and there are strict requirements of aerodynamic and strength limitation, so certain control strategies must be adopted to meet the operating requirements of the engine. Engine mathematical model is the core of engine simulation technology, the basis of analyzing engine characteristics, studying its control law, and designing and analyzing the control system. It is also an important condition for the research of integrated flight/propulsion control system. Based on the analysis of the characteristics of turbofan engine components and the thermodynamic calculation process, a component level nonlinear mathematical model of the engine with variable specific heat is established. This model can be used to calculate the steady and dynamic processes of turbofan engines under different control laws. It can also be used as the research object of multivariable control. In this paper, based on mentioning the theoretical basis for making a dynamic model of a turbofan engine, an assumption was made to create a dynamic model. Next, a geometrical structure diagram of a turbofan engine was created to create a dynamic model and the principle of the modeling method was explained. Also, based on the calculation of the characteristics of the turbofan engine and the calculation of the parts, the dynamic equation of the turbofan engine was prepared. The mathematical model of turbofan engine established in this paper has certain practicability and can be used as the basis of engine control research.
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