Robust Control Systems.
Abstract
The Doyle and Stein robustness enhancement technique for continuous-time LQG stochastic controllers was investigated in application to simple examples and a realistic Apollo Command Service Module/Lunar Module Thrust Vector Control System that exhibited severe robustness problems in its initial design. This technique was then extended to discrete-time systems in two ways. First, the continuous-time controller to which the Doyle and Stein technique had been applied was discretized using first order approximations. Second, an approximation to their continuous-time technique was developed for sampled-data control systems. In addition, an attempt was made to enhance the robustness of sampled-data systems by directly picking the gain of the Kalman filter within the controller structure based on an approach similar to that of Doyle and Stein.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1981
- Accession Number
- ADA115478
Entities
People
- Eric D. Lloyd
Organizations
- Air Force Institute of Technology