Rapid active disturbance rejection method for air cavity pressure based on extended state observer

An expansion state and observer technology, applied in fluid pressure control, instrumentation, non-electric variable control and other directions, can solve problems such as PID phase lag, reduce adjustment time and dynamic deviation, improve control quality, and improve dynamic response speed. Effect

Active Publication Date: 2020-07-14
SOUTHWEAT UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a fast active anti-disturbance method for air chamber pressure based on an expansion state observer, which solves the problem that the existing control technology PID has a serious lag in tracking the phase of the system

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  • Rapid active disturbance rejection method for air cavity pressure based on extended state observer
  • Rapid active disturbance rejection method for air cavity pressure based on extended state observer
  • Rapid active disturbance rejection method for air cavity pressure based on extended state observer

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Embodiment 1

[0052] The air cavity pressure rapid active anti-disturbance method based on the expansion state observer provided by the present invention is suitable for the intake and exhaust pressure control of typical engine transition state test tasks, such as figure 1 As shown, the main steps of the method include:

[0053] S1. Construct an air cavity pressure system control model based on linear active disturbance rejection control, and use a linear expansion state observer to estimate the total disturbance in real time according to the air cavity pressure system control model;

[0054] S2. According to the total disturbance, use the extended state feedback mechanism to dynamically transform the original uncertain system into an integral series system;

[0055] S3. Estimate the disturbance by using a linear active disturbance rejection controller according to the integral series system;

[0056] The parameter adjustment of the linear active disturbance rejection controller includes t...

Embodiment 2

[0099] In order to further illustrate the present invention, the flight mission of a certain period of time is taken as an example below with a certain type of engine:

[0100] This flight mission includes two working conditions: 1) The engine test condition (within 0 to 80 seconds) where the throttle lever of the engine remains unchanged and the Mach number changes; Transition state test conditions (80-160 seconds). image 3 From top to bottom, it shows the real-time changes of engine throttle lever, flight Mach number, engine air flow and inlet pressure.

[0101] 1) Working condition 1 (within 0 to 80 seconds): During this process, the engine throttle lever is always in the idle zone. The change of the flight Mach number of the engine is realized by adjusting the intake pressure, that is, the intake pressure is adjusted within 7s at Change within to achieve engine Mach number in changes between. As the Mach number changes, the engine air flow also changes, and its vari...

Embodiment 3

[0105] In the following, the air cavity pressure fast active anti-disturbance method based on the expansion state observer is used to compare the anti-disturbance ability of the controller under the fast operation test condition of the engine throttle lever.

[0106] The main purpose of applying the linear active disturbance rejection controller to the air cavity pressure control system is to solve the problem that the intake pressure is difficult to control in the engine transition state test. The simulation is tested according to the most challenging test conditions. Figure 4 and Figure 6 The control effects of the linear active disturbance rejection controller and PID in the engine transition state test are given respectively. The maximum deviation of the controlled pressure under the action of the PID controller is 6.91kPa (the maximum instantaneous fluctuation is 9.21%), the adjustment time is 20s, and the maximum deviation of the controlled pressure under the action of...

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Abstract

The invention provides a rapid active disturbance rejection method for air cavity pressure based on an extended state observer. The method is suitable for intake and exhaust pressure control of a typical engine transition state test task, and mainly comprises the following steps of constructing a control model of an air cavity pressure system based on linear active disturbance rejection control, and estimating total disturbance (the sum of internal disturbance and external disturbance) influencing a controlled quantity in real time through an extended state observer, dynamically transforming an original uncertain system into an ideal integral series system through a special state feedback mechanism, estimating disturbance by utilizing natural advantage predictability and disturbance rejection of a linear active disturbance rejection controller, and updating the convergence rate and the global search capability through an improved whale algorithm, and immediately eliminating disturbanceby using the controlled quantity, so that the purpose of rapid and active disturbance rejection is achieved. Technical support can be provided for follow-up complex control technology research such as aircraft engine transition state test environment simulation multivariable control and dynamic decoupling control.

Description

technical field [0001] The invention belongs to the field of control technology related to electric power systems, in particular to a fast and active anti-disturbance method for air cavity pressure based on an expansion state observer. Background technique [0002] The active anti-disturbance control of the air cavity pressure system is a necessary condition for establishing the air working environment of the engine test. Due to the obvious characteristics of the engine transition state assessment test, such as short time, large disturbance impact, and difficulty in obtaining the characteristic model of the disturbance source accurately, the current control The bottleneck problem of quality improvement is particularly prominent. Foreign scholars have mainly conducted engineering application research on parameter self-tuning control technology, gain scheduling, valve classification adjustment, adaptive control, combined control, and feedforward control, which have greatly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04G05D16/00G06N3/00
CPCG05B13/045G05D16/00G06N3/006
Inventor 白克强但志宏张松钱秋朦蒋国莉刘磊郭明明
Owner SOUTHWEAT UNIV OF SCI & TECH
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