Improved Smith estimator-based H-infinity control method of aero engine

Abstract

The invention provides an improved Smith estimator-based H-infinity control method of an aero engine, and belongs to the technical field of aero engine control and simulation. The improved Smith estimator-based H-infinity control method comprises the steps of building a reasonable small deviation linear model for an aero engine non-linear model, and selecting data of a state space model in a certain working condition as a controlled object designed by a controller; selecting an appropriate performance index weighting function parameter, solving an H-infinity output feedback controller, and adjusting the parameter to basically achieve control requirement; and designing an improved-structure Smith estimation compensator according to a closed-loop feedback control system designed according toan H-infinity control law so as to form a composite controller, additionally arranging a deviation correction controller, designed according to a PID control law, in the control system according to relatively large deviation between an estimation model and the parameter of the controlled object and a true model and the parameter, employing the deviation correction controller to stabilize the controlled object, making adaptability correction according to comparison between the controlled object and a model output signal so as to further improve robustness of the system.

Description

technical field [0001] The invention provides an aeroengine H∞ control method based on an improved Smith predictor, and belongs to the technical field of aeroengine control and simulation. Background technique [0002] The invention relies on the compensation and control of a distributed network time-delay system based on a certain type of twin-shaft turbofan engine nonlinear component-level mathematical model. [0003] Aeroengine is a complex multivariable control system with strong time-varying and strong nonlinearity. The reliability and efficiency of its work are crucial to the safe flight of the aircraft. With the continuous improvement of the design requirements of the aero-engine control system, it is difficult for the centralized control architecture to meet the complex control requirements. In order to further improve system reliability, reduce weight and reduce cost, the application of engine distributed control architecture is more and more extensive. The networ...

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Problems solved by technology

[0007] The H∞ control method of the aero-engine based on the improved Smith predictor, the controller part of the control system closed-loop loop used in the H∞ control method of the aero-engine contains two parts, the first part is the controller designed by the H∞ control strategy , mainly to complete the tracking control of the controlled variables of the aero-engine; the second part is to use the time-delay compensation strategy of the improved Smith predictor to solve the lack of adaptability to the time-delay phenomenon of the aero-engine controller designed based on the H∞ control strategy The problem;

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