Nonlinear prediction control design method for variable cycle engine

Abstract

The invention discloses a nonlinear prediction control design method for a variable cycle engine, and the method comprises the steps: building a standard form of a variable cycle engine model block diagram; obtaining a nonlinear generalized minimum variance controller according to the standard form; estimating the impact on the control performance of the variable cycle engine from all design parameters of the nonlinear generalized minimum variance controller; and carrying out the contrastive analysis to determine the design parameters of an optimal controller. Aiming at the problems that a variable cycle engine is strong in nonlinearity, is difficult to model and is not high in model precision, the method employs a novel nonlinear generalized minimum variance control method, and can enablethe control performance of the variable cycle engine to be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of system control and simulation in aviation propulsion theory and engineering, and specifically relates to a nonlinear predictive control design method for variable cycle engines. Background technique [0002] A variable cycle engine refers to a gas turbine engine that changes its thermodynamic cycle parameters by changing the geometry, size or position of certain parts of the engine. Some cycle parameters of the engine, such as boost ratio, air flow or bypass ratio, are changed through variable cycle regulation, so that the engine has good performance under various working conditions. In the field of turbojet / turbofan engines, variable The focus of cycle engine research is to change the bypass ratio, such as reducing the bypass ratio during acceleration, climb and supersonic flight, so that the engine has performance characteristics similar to turbojet (high unit thrust); during takeoff and subsonic flight...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a nonlinear predictive control design method for variable cycle engines, which effectively solves the problems of strong nonlinearity, difficult modeling, and low model accuracy of existing variable cycle engines. Under the effective control problem, the present invention does not need the mathematical model of the engine, and the design is simple and the debugging is convenient

Images