Discrete Sliding Mode Adaptive Control Method for Aircraft Based on Uncertainty Upper Bound Estimation

Abstract

The invention relates to an aircraft discrete sliding mode adaptive control method based on uncertainty upper bound estimation, which is used to solve the technical problem of poor practicability of the existing aircraft discrete control method. Carry out Euler discretization on the longitudinal channel dynamics model of the aircraft to obtain the discrete form of the original system; consider the causal relationship of the system and establish an equivalent prediction model of the discrete strict feedback system; define the system uncertainty and design an automatic model with a dead zone The adaptive law estimates the unknown upper bound of uncertainty online; the upper bound estimation error is introduced into the update law of the upper bound of uncertainty, which improves the estimation accuracy; the sliding mode surface is defined, and the current control input is designed with the future expected output, and the design A discrete sliding mode adaptive controller based on the backstepping method; the present invention combines the characteristics of computer control, and the discrete sliding mode controller designed through model conversion effectively avoids non-causal problems, and improves the robustness and adaptability of the flight control system , suitable for engineering applications.

Description

technical field [0001] The invention belongs to the field of aircraft control, in particular to an aircraft discrete sliding mode adaptive control method based on uncertainty upper bound estimation. Background technique [0002] In actual engineering, with the development of computer technology, many high-performance aircraft are equipped with computer systems, and most of their control tasks need to be realized by onboard computers. Therefore, the study of advanced control methods in discrete situations is of great significance to the research of aircraft control. And there is an urgent need. [0003] The design of discrete controllers usually adopts two methods: 1) first design the controller according to the continuous control object, and then discretize the continuous controller; 2) design the discrete controller directly according to the discrete control object. The first method requires a faster sampling rate and requires higher system hardware. In actual engineering...

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Problems solved by technology

[0006] In order to overcome the shortcomings of poor practicability of existing discrete control methods for aircraft, the present invention provides a discrete sliding mode adaptive control method for aircraft based on uncertainty upper bound estimation

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