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针对航空发动机线性变参数(Linear Parameter Var-ying:LPV)模型存在误差积累的问题,提出一种改进LPV模型。以某型涡扇发动机非线性模型为基础,建立以低压转子转速为调度变量的涡扇发动机LPV模型,在该模型上增加一个转速-供油量反馈,连同一个PI环节形成闭环回路,实现对LPV模型的改进。仿真结果表明:改进LVP模型可以有效地克服LPV模型误差积累的缺陷,更真实地反映非线性模型的稳态和动态特性。
Aiming at the problem of accumulating errors in the Linear Parameter Variation (LPV) model of aircraft engine, an improved LPV model is proposed. Based on the non-linear model of a turbofan engine, a LPV model of turbofan engine with low-pressure rotor speed as the scheduling variable is established. A speed-fuel supply feedback is added to this model, together with a PI loop to form a closed-loop circuit, Improvement of LPV model. Simulation results show that the improved LVP model can effectively overcome the defect of LPV model error accumulation and more accurately reflect the steady-state and dynamic characteristics of the nonlinear model.