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L1 adaptive control-based fault-tolerant control method for elastic hypersonic aircraft

An adaptive controller and adaptive control technology, applied in the field of aircraft control, can solve problems such as high possibility of failure and many uncertain factors

Active Publication Date: 2020-12-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the working environment of the aircraft is difficult, there are many uncertain factors and the possibility of failure is greater

Method used

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  • L1 adaptive control-based fault-tolerant control method for elastic hypersonic aircraft
  • L1 adaptive control-based fault-tolerant control method for elastic hypersonic aircraft
  • L1 adaptive control-based fault-tolerant control method for elastic hypersonic aircraft

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0172] Example 1: Fault-free level flight status, PID controller effect.

[0173] Select the controller parameters as follows: K φ =[20,0.1,0], Such as figure 2 and image 3 As shown, under the no-fault state, the model can maintain a stable level flight state under the action of the PID controller.

example 2

[0174] Example 2: Fault level flight state, PID controller and Comparison of adaptive controller effects.

[0175] The failure fault ranges from 0 to 1, and the failure fault step size is set to 0.05. After a series of experiments, the maximum failure rate that the PID controller can tolerate is 0.35 in the level flight state. Between 0.35-0.5, the longitudinal speed can be controlled, but highly divergent. If the loss of the actuator exceeds 50%, it will get out of control. Figure 4-Figure 6 is the PID controller when the failure rate is 0.45 and Comparison of Adaptive Controllers. In level flight, Adaptive controllers are significantly better than PID controllers.

example 3

[0176] Example 3: Fault-free pitch maneuver, PID controller effect.

[0177] The control parameters are set as follows: K φ =[20,0,0], Such as Figure 7-Figure 9 As shown, the model can complete the pitching maneuver under the action of the PID controller. Longitudinal speed and height meet the requirements,

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Abstract

The invention provides an L1 adaptive control-based fault-tolerant control method for an elastic hypersonic aircraft. Firstly, an adaptive controller is designed for nonlinear dynamics and kinematicsmodels of the elastic hypersonic aircraft, and the adaptive controller comprises a longitudinal speed adaptive controller and a height adaptive controller so that expected performance is achieved, anda target speed and height are achieved; and then, in order to ensure reliability of flight, elevator failure faults are added into the model of the elastic hypersonic aircraft, fault-tolerant controlis carried out, and stable level flight and pitching maneuver in a fault state are realized. Compared with other control methods, the method has the advantages that one set of parameters can be usedfor control, operation is convenient, an influence of external interference and uncertainty on a result can be effectively reduced, the stability of the elastic hypersonic aircraft is improved, and the expected flight performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of aircraft control, and specifically proposes an elastic hypersonic aircraft fault-tolerant control method based on L1 adaptive control. Background technique [0002] Hypersonic aircraft refers to aircraft, missiles, artillery shells and other winged or wingless aircraft that can move at a speed more than five times the speed of sound. It has the characteristics of high penetration success rate. Hypersonic vehicles have enormous military and economic value. The first US flight of the X-51 using an air-breathing scramjet engine was a milestone in the development of hypersonic vehicles, and France set up a project called "Promexi" to study hypersonic vehicles. India lost its job at the Thermodynamics of Hypersonic Flight conference in Bannerale, and China has also made some progress in air breathing systems in recent years. Hypersonic vehicles have great application value, especially in the military, and h...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 李昭莹石帅
Owner BEIHANG UNIV