Analysis and Modeling of Variable Cycle Engine Control System

Variable cycle engine (VCE) has many control variables, complex working process, wide range and fast change of environmental conditions, and complex control laws, which make the design of control system more difficult in engineering practice. In this paper, the double culvert VCE with core engine drive fan is studied. By analyzing the variation law of engine performance when the parameters of adjustable components change, the control quantity of the control system is determined. RSCN method is used to analyze and verify the rationality of the combination of different controlled quantities, and the controlled quantity of the control system is determined. The linear model of VCE is established and verified by simulation. The results show that the established linear model can accurately fit the nonlinear model, and the model linearization method is reasonable and effective, which can be used in the design of variable cycle engine control system.