Optimal control method for acceleration process of variable cycle engine

Abstract

The invention provides an optimal control method for an acceleration process of a variable cycle engine, which is characterized in that according to the characteristics of the variable cycle engine, an improved simplex method is improved, a reflection center is improved, and a 'vertex translation' strategy is added. The vertex translation operation can accelerate the search speed, reduce the number of iterations, and quickly converge to an optimal solution. And the improved simplex method is used for optimizing the acceleration process, and the optimal control variable is output to the variable cycle engine. According to the method, optimal control over the acceleration process of the variable-cycle engine can be achieved, the optimal working mode of the variable-cycle engine under the specific working condition is selected, the optimal steady-state performance is achieved, on the premise that safe working of the variable-cycle engine is guaranteed, the acceleration time of the variable-cycle engine is shortened, the acceleration performance of the variable-cycle engine is effectively improved, and the maneuverability of the aircraft is improved.

Description

technical field [0001] The invention relates to the technical field of variable cycle engine control, in particular to an optimal control method for the acceleration process of a variable cycle engine. Background technique [0002] Modern warfare requires advanced fighter jets to have the ability to cruise at subsonic speeds with a long range, and at the same time to have the ability to respond quickly during combat. In the future, variable cycle engines will continue to develop in three directions: long cruising range, high thrust-to-weight ratio, and wide operating range. By studying the speed characteristics of conventional engines, the researchers found that the turbojet engine has higher unit thrust and lower unit fuel consumption rate in the supersonic state, while the large bypass ratio turbofan engine has lower unit fuel consumption rate in the subsonic state . Considering the performance requirements of fighter propulsion systems in modern warfare, turbofan engines...

AI Technical Summary

Problems solved by technology

For example, the simplex method has a super-linear convergence speed and a small number of iterations, but the basic simplex method is sensitive to the initial value and is easy to fall into a local optimal solution, so it is not suitable for the optimization control of the acceleration process of the complex variable cycle engine

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