Accession Number : ADA185202

Title :   Design of Low Order Controllers for Robust Disturbance Rejection in Large Space Structures.

Descriptive Note : Master's thesis,

Corporate Author : ILLINOIS UNIV AT URBANA DECISION AND CONTROL LAB

Personal Author(s) : Ramaker, Russell A

PDF Url : ADA185202

Report Date : Sep 1987

Pagination or Media Count : 67

Abstract : This thesis will investigate several issues relating to the objective of improving the disturbance rejection of a Large Space Structure (LSS) type system. Due to properties of LSS systems, the design of the controller must address three main issues: 1) improving of the disturbance rejection properties of the system; 2) insuring that the controller is robust to modeling uncertainty; and 3) implementing the design as a low order output feedback controller. The disturbance rejection of the system will be quantified using the H-norm. An arbitrary level of disturbance rejection will then be achieved through a Linear Quadratic (LQ) minimization. This LQ solution produces a state feedback controller which is robust to modeling uncertainty. In order to realize this design, a low order output feedback controller will be designed based on the LQ solution using projective controls. The method described in this thesis will then be applied to a 40th order LSS example. Using a decentralized approach, a controller will be designed which satisfies the issues discussed above.

Descriptors :   *SPACE SYSTEMS, *CONTROL SYSTEMS, *SYSTEMS ENGINEERING, FEEDBACK, OPTIMIZATION, PROJECTIVE TECHNIQUES, OUTPUT, DECENTRALIZATION, DAMPING, THESES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE