Fixed-Time Active Disturbance Rejection Temperature-Pressure Decoupling Control for a High-Flow Air Intake System

Area of Science:

• Aerospace Engineering
• Control Systems Theory

Background:

• High-flow aeroengine transient tests present challenges for intake environment simulation systems (IESSs) due to strong coupling and external disturbances.
• Effective simulation requires precise control over system dynamics.

Purpose of the Study:

• To develop and validate a novel compound control scheme for IESSs.
• To enhance tracking accuracy, convergence speed, and robustness against disturbances in aeroengine transient tests.

Main Methods:

• A compound control scheme combining fixed-time active disturbance rejection and static decoupling is proposed.
• The scheme integrates a fixed-time sliding-mode controller (FT-SMC) and a super-twisting fixed-time extended-state observer (ST-FT-ESO).
• Decoupling transformation separates pressure and temperature dynamics; the observer estimates states and disturbances.

Main Results:

• The proposed scheme significantly reduces absolute integral error (AIE) by 71.9% for pressure and 77.9% for temperature.
• Mean-squared error (MSE) is reduced by 46.0% (pressure) and 41.3% (temperature).
• Settling time is improved from over 5 seconds to under 2 seconds, validated via hardware-in-the-loop (HIL) simulations.

Conclusions:

• The compound control scheme offers superior tracking accuracy and faster convergence compared to conventional methods.
• The system demonstrates enhanced robustness against external disturbances and residual coupling.
• The validated performance on a real-time PLC confirms its practical applicability for IESSs.