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

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.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1987
Accession Number
ADA185202

Entities

People

  • Russell A. Ramaker

Organizations

  • University of Illinois Urbana–Champaign

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Classification
  • Closed Loop Systems
  • Differential Equations
  • Eigenvalues
  • Electrical Engineering
  • Equations
  • Feedback
  • Frequency
  • Frequency Domain
  • Frequency Response
  • Large Space Structures
  • Linear Systems
  • Rejection
  • Security
  • Transfer Functions
  • Uncertainty

Readers

  • Mathematical Modeling and Probability Theory.
  • Robotics and Automation.
  • Systems Analysis and Design

Technology Areas

  • Space
  • Space - Spacecraft Maneuvers