Linear active disturbance rejection control (ADRC) design and parameter tuning of aircraft pitch attitude

Abstract

The present invention provides a linear active disturbance rejection control (ADRC) design and parameter tuning of aircraft pitch attitude. The linear active disturbance rejection control (ADRC) design and parameter comprises the steps of (1) establishing direct and indirect influence relations which describe an elevator influence pitch angle directly for a pitch nonlinear kinetic equation, (2) for the pitch channel kinetic equation obtained in the step (1), taking all indirect influence items as disturbance, designing a linear expansion state observer, estimating and compensating a linear expansion state observer, and using a simple PD control strategy for a compensated system, (3) using a small perturbation hypothesis principle to carry out linearization to obtain a kinetic coefficient for the nonlinear equation obtained in the step (1), (4) carrying out graphical tuning of a control parameter according to a robust stability index and a dynamic performance index. According to the method, on the basis of ensuring the stable robustness and good dynamic quality of a controller, the form is very simple, at the same time, the pattern parameter tuning method based on a stable margin test factor has a visual characteristic, and the blindness of parameter debugging is avoided.

Description

technical field [0001] The invention relates to the field of aerospace, in particular to the design and parameter setting of a linear active disturbance rejection controller for the pitching attitude of an aircraft, which is especially suitable for fast design process realization, and the system has strong robustness to the uncertainty of aerodynamic parameters. Background technique [0002] The pitch angle control of the aircraft has a very mature control design technology in engineering, but the design method generally has strict requirements on the experience and technical ability of the designer, and the design cycle, difficulty and cost are relatively high, especially the traditional PID control in high-precision There are certain deficiencies in tracking instructions. Therefore, there is a very important and urgent need for a standardized, concise, high-performance and robust pitch angle control design method. [0003] Active Disturbance Rejection Control (ADRC) (Han ...

AI Technical Summary

Problems solved by technology

Although LADRC is a linear form, due to the use of ESO, the uncertainty and nonlinearity within a certain time scale can be estimated and directly compensated, which is different from the standard nonlinear control method (non-adaptive situation) that requires nonlinear construction Compared with the method of modeling and clarifying the characteristics of its dynamic coefficients, it is obviously simplified, and no longer specifically distinguishes between linear and nonlinear

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