Abstract:

In order to solve the incompatibility between a traditional PID controllers and the high-quality control requirements from launch vehicles in ascent phase under the impact of complex environment, large uncertain disturbance, elastic vibration and so on, the adaptive augmenting control (AAC) is investigated. Firstly, a nominal PID controller integrated with a digital filter based on particle swarm optimization (PSO) is developed to control the rigid body and suppress the elastic vibration. Then, as a solution to the control problem originating from the large-scale disturbance, uncertainty and additional oscillation caused by the switched-filter, an adaptive gain adjustment algorithm is designed, of which the working and designing principle is investigated as well. For the improvement of the controller performance, a disturbance compensation loop and an active load-relief loop are introduced to further reduce the influence of the internal-external perturbation, elastic vibration and wind-load. Finally, a simulation is carried out under the condition where all the above mentioned disturbances exist. The simulation results indicate that the flight performance is significantly improved with the proposed control system, which demonstrates that the controller is worthy of theoretical research and engineering application.

Key words: Adaptive augmenting control (AAC), Particle swarm optimization (PSO), Adaptive gain online adjustment, Disturbance compensation, Active load-relief