Dynamic Reoptimization of a Missile Autopilot Controller in Presence of Unmodeled Dynamics
Online trained neural networks have become popular in recent years in designing robust and adaptive controllers for dynamic systems with uncertainties in their system equations because of their universal function approximation property. This paper discusses a technique that dynamically reoptimizes a Single Network Adaptive Critic (SNAC) based optimal controller in the presence of unmodeled uncertainties. The controller design is carried out in two steps: (i) synthesis of a set of online neural networks that capture the uncertainties in the plant equations on-line (ii) re-optimization of the existing optimal controller to drive the states of the plant to a desired reference by minimizing a predefined cost function. The neural network weight update rule for the online networks has been derived using Lyapunov theory that guarantees both the stability of the error dynamics as well as the boundedness of network weights. This approach has been applied in the online re-optimization of a missile longitudinal autopilot controller and numerical results from simulation studies are presented here.
N. Unnikrishnan and S. N. Balakrishnan, "Dynamic Reoptimization of a Missile Autopilot Controller in Presence of Unmodeled Dynamics," Proceedings of the AIAA Guidance, Navigation, and Control Conference and Exhibit 2005 (2005, San Francisco, CA), American Institute of Aeronautics and Astronautics (AIAA), Aug 2005.
AIAA Guidance, Navigation, and Control Conference and Exhibit 2005 (2005: Aug. 15-18, San Francisco, CA)
Mechanical and Aerospace Engineering
Keywords and Phrases
Dynamic Systems; Neural Networks; Robust Controllers
Article - Conference proceedings
© 2005 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.
18 Aug 2005