Method for building adaptive identity card model of variable cycle engine in mode switching

Abstract

The invention discloses a method for building an adaptive identity card model of a variable cycle engine in mode switching. Performance characteristic parameters are updated in one mode by adopting anextended kalman filter on the basis of a nonlinear component-level model of the variable cycle engine in an idle state; updating of the performance parameters is stopped in the mode switching process; component characteristics in the switching process are corrected by adopting mean values, estimated through multiple steps, of the performance parameters in the previous mode; updating of the performance parameters is restarted after the variable cycle engine is switched into another mode; and the target of estimating the performance characteristic parameters of rotor components of the variablecycle engine in the mode switching process of the variable cycle engine is achieved, thereby obtaining the adaptive identity card model of the variable cycle engine in mode switching. The method has relatively high adaptive capacity to model mismatching caused by individual differences generated by performance degradation of the variable cycle engine, and especially for the mode switching processof the variable cycle engine, the accuracy of nonlinear individual models of the variable cycle engine in the mode switching process can be effectively improved.

Description

technical field [0001] The invention relates to the field of aero-engine modeling and simulation, in particular to a method for constructing an adaptive ID card model for variable-cycle engine mode switching. Background technique [0002] Driven by the dual requirements of high speed and long range of the new generation of fighter jets, the variable cycle engine can change the thermal cycle of the engine by changing the bypass ratio of the engine under different flight conditions due to its adjustable geometric components, so that it can To obtain the best flight performance under different mission requirements, the basic structure of the double-external variable-cycle engine is as follows: figure 1 As shown, it mainly consists of two typical working modes. [0003] Single external mode: close the mode selection valve, reduce the area of ​​the front and rear adjustable duct injector (Variable Area Bypass Injector, VABI), so that almost all the air flow through the front fan...

AI Technical Summary

Problems solved by technology

The linear model has a small amount of calculation and a low occupancy of computing resources, but the error is large, and the fitting accuracy for the dynamic process of the engine is poor

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