Theta-D Controller-Filter for Aeroelastic Flutter Suppression
θ-D controller-filter for aeroelastic flutter suppression
A new suboptimal nonlinear filter-based feedback control technique for the suppression of aeroelastic flutter is presented in this study. Novelty of this work lies in utilizing a new technique, called the theta-D method for both the controller and the filter formulations. The theta-D method is synthesized by adding perturbations to a typical optimal control formulation with a quadratic cost function. The controller expressions are obtained by getting an approximate solution to the Hamilton-Jacobi-Bellman (HJB) equation. In many applications, an estimation technique is needed for use in the controller feedback since all the system states are usually not available for measurements. By using the dual nature of controllers and filters, a steady state theta-D filter expression is used for the filter dynamics. A controller using this new method has been designed to suppress the aeroelastic flutter of an airfoil using a filter-based feedback design. Simulation results show that the theta-D filter based controller successfully suppresses any aeroelastic flutter over a range of initial conditions and parameter variations.
D. Drake and S. N. Balakrishnan, "Theta-D Controller-Filter for Aeroelastic Flutter Suppression," AIAA Atmospheric Flight Mechanics Conference and Exhibit, American Institute of Aeronautics and Astronautics (AIAA), Aug 2004.
Mechanical and Aerospace Engineering
Keywords and Phrases
Bellman Theory; Hamilton-Jacobi Equation; Perturbation Theory; Control Systems Design; Feedback Control; Nonlinear Filters; Optimal Control; Vibration Damping
Article - Conference proceedings
© 2004 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.