On Robust Control Designs for Infinite Dimensional Systems
Abstract
This thesis deals with the robustness of stability of distributed, linear-time-invariant (DLTI) feedback control systems. The main goal is to formulate a practical method for evaluating feedback designs based on the actual DLTI system characteristics. As a result, a design procedure can be developed for DLTI systems to synthesize feedback controllers that are guaranteed to be closed-loop stable. We have developed a robustness characterization for DLTI systems, and have shown that linear quadratic (LQ) optimal control systems have nice robustness properties and can serve as good reference designs for the actual implementation of the feedback controller. We have studied in detail linear hereditary differential systems and a vibration suppression problem for a flexible beam. We stress the study of implementable controllers, which are finite dimensional, in contrast to optimal controllers that are typically infinite-dimensional. However, one can integrate our multivariable robustness results with the LQ optimal control to derive a finite-dimensional suboptimal control law which is closed-loop stable. We show how this can be done by using spatially-sampled measurements along the flexible beam.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1986
- Accession Number
- ADA177649
Entities
People
- Wing H. Lee
Organizations
- Massachusetts Institute of Technology