Robust decoupling inner-loop control for a post-stall maneuverable fighter
ZHOU Chijun1,2, ZHU Jihong1, LEI Humin2, YUAN Xiaming1, YIN Hang1
1. Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China;
2. Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China
Abstract：A robust decoupling control approach was developed for a strongly nonlinear and strongly coupled inner-loop system for post-stall maneuvers. The control process includes moment compensation, linear controller design and robust compensation. The aerodynamic moment, inertial coupling moment and additional moment caused by the thrust vector are first compensated through querying an aerodynamic database with the damping moment not included. A second-order reference model is then employed to determine the proportional and integral coefficients of the linear controller. A series of aerodynamic moment derivatives and thrust force parameter perturbations are then described by sine functions to get an analytical expression for the model uncertainty and a robust compensator based on the sliding mode control methodology. Simulations show that the energy consumption can be reduced when the aerodynamic damping moment is not included. Moreover, the Herbst maneuver and robust command tracking can be achieved, even with 60% parameter perturbations in the aerodynamic derivatives and 20% perturbations with the control derivatives.
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2015, Vol. 55 
