Wind tunnel magnetic suspension balance multi-layer finite time composite disturbance rejection control method and system

By employing a multi-layer parallel finite-time composite disturbance rejection control method, the dominant disturbance frequency band is identified using sliding window DFT. Combined with variable damping sliding mode surface and variable gain double power-law approach, the broadband unsteady aerodynamic problem caused by shear layer disturbance in low-speed wind tunnel is solved, achieving fast response and strong robust airflow disturbance suppression.

CN122151558APending Publication Date: 2026-06-05NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Filing Date
2026-05-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In low-speed wind tunnels, especially open wind tunnels, broadband and unsteady aerodynamic disturbances caused by shear layer disturbances are difficult to suppress effectively. Traditional controllers suffer from gain attenuation under large gaps and limited dynamic response. Observers struggle to simultaneously guarantee high-frequency estimation accuracy and low-frequency steady-state performance under broadband disturbances. Sliding mode control is prone to chattering and instability.

Method used

A multi-layer parallel finite-time composite disturbance rejection control method is adopted. The dominant disturbance frequency band is identified in real time by sliding window discrete Fourier transform, and a high-medium-low frequency hierarchical observation architecture is constructed. Combined with finite-time sliding mode control of variable damping composite sliding surface and variable gain double power-law approaching law, the unsteady and multi-frequency airflow disturbances can be effectively suppressed.

Benefits of technology

It achieves rapid response and robust suppression of broadband airflow disturbances in low-speed wind tunnels, reduces dependence on real-time frequency estimation, improves disturbance estimation accuracy and system stability, and reduces control signal chattering.

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Abstract

The application discloses a wind tunnel magnetic suspension balance multilayer finite time composite disturbance rejection control method and system, the method comprises the following steps: obtaining the displacement signal of the magnetic suspension balance suspension model, and decomposing the displacement signal into multiple time domain signals; performing spectrum analysis on the displacement signal to obtain the real-time energy of each frequency band; dynamically adjusting the fusion weight of each layer observer according to the relative size of the real-time energy of each frequency band; constructing a multilayer parallel finite time extended state observer, obtaining each layer disturbance estimation value and weighted sum, and obtaining the total disturbance estimation value; constructing a non-singular double power integral type fast terminal sliding mode controller, and designing a sliding mode control law; the total disturbance estimation value is superimposed into the sliding mode control law as a feedforward compensation term to generate a final control signal to drive an actuator. The application can effectively suppress multi-frequency airflow disturbance, has strong robust stability, and provides a solution with fast response and strong robustness for a large-gap magnetic suspension balance system.
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