Journal Article

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

Xu, Zhouzhe, Xiao, Gaoxi, Shi, Duoqi, Dan, Zhihong, Zhai, Chao, Zhang, Louyue, Zhang, Hehong, Wang, Xi

2025

Overview

High-flow aeroengine transient tests involve strong coupling and external disturbances, which pose significant challenges for intake environment simulation systems (IESSs). This study proposes a compound control scheme that combines fixed-time active disturbance rejection with static decoupling methods. The scheme integrates a fixed-time sliding-mode controller (FT-SMC) and a super-twisting fixed-time extended-state observer (ST-FT-ESO). A decoupling transformation separates pressure and temperature dynamics into two independent loops. The observer estimates system states and total disturbances, including residual coupling, while the controller ensures fixed-time convergence. The method is deployed on a real-time programmable logic controller (PLC) and validated through hardware-in-the-loop (HIL) simulations under representative high-flow scenarios. Compared to conventional linear active disturbance rejection decoupling control (LADRDC), the proposed scheme reduces the absolute integral error (AIE) in pressure and temperature tracking by 71.9% and 77.9%, respectively, and reduces the mean-squared error (MSE) by 46.0% and 41.3%. The settling time improves from over 5 s to under 2 s. These results demonstrate improved tracking accuracy, faster convergence, and enhanced robustness against disturbances.

• Publisher: MDPI AG,MDPI
• Subject: active disturbance rejection control / Air intakes / Altitude / altitude test facility / Convergence / Coupling / Decoupling method / Design / Disturbances / Environment simulation / fixed-time control / flight environment simulation system / Hardware-in-the-loop simulation / Heat / Intake systems / Process controls / Programmable logic controllers / Real time / Rejection / Simulation / Simulation methods / Sliding mode control / sliding-mode controller / State observers / Systems stability / temperature–pressure decoupling control / Tracking / Valves