Nonlinear system output feedback self-adaptive control system and method adopting HOSM observer

Abstract

The embodiment of the invention provides a nonlinear system output feedback self-adaptive control system and method adopting an HOSM observer, which relate to the technical field of self-adaptive control. For a single-input single-output uncertain nonlinear system with actuator limitation, particularly under the condition of control gain uncertainty and actuator speed limitation, the characteristics of an HOSM observer are utilized, and the unmeasured state of the system can be accurately estimated under the condition that only the output quantity of the observed system is needed. The design of the relatively independent observer enables the design of the controller to be easier, and when the method is applied to the rolling dynamic control of the delta wing aircraft, the self-adaptive adjustment capability of the delta wing aircraft to the external environment and the robustness of the self-adaptive control system are also improved.

Description

technical field [0001] The present application relates to the technical field of adaptive control, in particular, to a nonlinear system output feedback adaptive control system and method using a HOSM observer. Background technique [0002] At present, there have been many researches on adaptive output feedback control for systems with input constraints. Usually, these methods need to construct an observer to estimate the unmeasurable variables in the system, and then combine some proven methods of dealing with input constraints to design an adaptive controller using the observer to solve these actual system control difficulties in. However, it is very difficult to design a good observer for a nonlinear system with uncertainty. The methods proposed in the prior art are complex in design, difficult to implement, and have the problem of inaccurate self-adaptive adjustment. [0003] For example, for the dynamic control of delta-wing aircraft under the condition of large angle ...

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Problems solved by technology

However, it is very difficult to design a good observer for a nonlinear system with uncertainty. The methods proposed in the prior art are complex in design, not easy to implement, and have the problem of inaccurate self-adaptive adjustment

[0003] For example, for the dynamic control of delta-wing aircraft under the condition of large angle of attack, the currently used model reference adaptive control method requires all states of the controlled system to be measurable, not an output feedback adaptive control method

In addition, many other output feedback adaptive control methods do not consider the situation that the system has actuator rate limitation and the system has control gain uncertainty

This can lead to less adaptive and less robust system control

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