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Method and system for precise control of air cavity pressure based on double valve adjustment

A control method and valve adjustment technology, which are applied in the aerospace field, can solve the problems of increasing economic cost, limited flow adjustment ability, inappropriate air cavity device, etc., and achieve the effect of low cost

Active Publication Date: 2022-06-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the air flow rate changes in a wide range, the precise control of the pressure in the cavity cannot be guaranteed.
Due to the limited flow adjustment capability of a single control valve, the use of a larger caliber control valve will increase the economic cost
[0003] However, if two regulating valves are used, this control method is applied in the field of hydraulic servo control and is not suitable for air chamber devices
Therefore, the control method of the air chamber based on double valve regulation has not been proposed yet.

Method used

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  • Method and system for precise control of air cavity pressure based on double valve adjustment
  • Method and system for precise control of air cavity pressure based on double valve adjustment
  • Method and system for precise control of air cavity pressure based on double valve adjustment

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Experimental program
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Effect test

Embodiment 1

[0060] figure 1 The flow chart of the method for precise control of air cavity pressure based on double-valve regulation provided in Embodiment 1 of the present invention.

[0061] refer to figure 1 , the method includes the following steps:

[0062] Step S101, obtaining a representative pressure error signal, using the representative pressure error signal as an input of a PI controller, and adopting a PI control algorithm to obtain a virtual total flow rate of the air cavity;

[0063] Here, the linearized model of the air cavity is defined as G, and the linearized model of the air cavity G is obtained by linearizing the nonlinear model of the air cavity.

[0064] Based on the linearized model G of the air cavity, design a PI controller and define the output of the PI controller is the actual total air discharge flow of the double control valve, so that the actual total air discharge flow of the double control valve is m act Total virtual bleed flow with air volume equa...

Embodiment 2

[0128] Image 6 This is a schematic diagram of the precise control system for the pressure of the air cavity based on the double-valve adjustment provided in the second embodiment of the present invention.

[0129] refer to Image 6 , the system includes: an upper layer controller, a lower layer controller and an air chamber device, the air chamber device includes a first regulating valve, a second regulating valve and an air chamber;

[0130] The upper-layer controller is used to obtain the representative pressure error signal, and the representative pressure error signal is used as the input of the PI controller, and the PI control algorithm is used to obtain the virtual total flow of the air cavity;

[0131] The lower controller is used to calculate the opening area of ​​the double control valve through the control distribution algorithm optimized by LMI according to the virtual total air flow rate; according to the functional relationship between the opening area of ​​the...

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Abstract

The present invention provides a method and system for precise control of air chamber pressure based on double-valve adjustment, including: obtaining a representative pressure error signal, using the representative pressure error signal as the input of a PI controller, and using a PI control algorithm to obtain a virtual air chamber The total flow of deflation; according to the total flow of virtual deflation, the opening area of ​​the double control valve is obtained through the control distribution algorithm of LMI optimization solution; according to the functional relationship between the opening area of ​​the double control valve and the displacement of the hydraulic cylinder spool, the dual control valve is calculated. The displacement of the hydraulic cylinder spool of the regulating valve; the opening of the double regulating valve is controlled according to the displacement of the hydraulic cylinder spool of the double regulating valve, and the pressure of the air chamber is controlled; the opening area of ​​the double regulating valve includes the opening area of ​​the first regulating valve and the opening area of ​​the second regulating valve The opening area of ​​the two regulating valves, the displacement of the hydraulic cylinder spool of the double regulating valve includes the displacement of the hydraulic cylinder spool of the first regulating valve and the displacement of the hydraulic cylinder spool of the second regulating valve. Precise control.

Description

technical field [0001] The invention relates to the technical field of aerospace, in particular to a method and system for precise control of air volume chamber pressure based on double-valve regulation. Background technique [0002] The air cavity device is the key sub-device of the large-scale air pipeline test bench, and its pressure control effect directly affects the overall performance of the test bench. Flow regulation is currently performed with a single regulator valve to control the pressure in the air cavity device. However, when the air flow varies widely, the precise control of the pressure in the cavity cannot be guaranteed. Due to the limited flow regulation capability of a single regulating valve, the use of a larger diameter regulating valve will increase the economic cost. [0003] However, if two regulating valves are used, this control method is applied in the field of hydraulic servo control, and is not suitable for air cavity devices. Therefore, no c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/17G06F30/28G06F111/04G06F113/08G06F119/14
CPCG06F30/15G06F30/17G06F30/28G06F2111/04G06F2113/08G06F2119/14
Inventor 刘佳帅王曦朱美印杨舒柏裴希同但志宏
Owner BEIHANG UNIV