Accession Number : ADP005876

Title :   A Structured Singular Value Approach to Missile Autopilot Analysis 2,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Hewer, G. A. ; Klabunde, Richard ; Kenney, Charles

Report Date : MAR 1989

Pagination or Media Count : 7

Abstract : A state space model for additive errors that is algebraically and dynamically equivalent to Doyle's structured singular value is presented. Using this theory a new algorithm based on a Monte Carlo eigenvalue search is presented. Some examples are included that illustrate the convergence properties of the Monte Carlo technique. Since plant perturbations can destabilize a nominally stable system, the term robustly stable refers to the extent to which a model of the open-loop system may be changed from the nominal design without destabilizing the overall closed-loop feedback system. What is really desired is a robustness analysis that will apply to simultaneous independent, not necessarily small, perturbations. There is a certain range, due to neglected nonlinearities and unmodeled system dynamics where the model and system may behave in grossly different ways. Unfortunately, this range is implicit in the technology that the model approximates and so any general theory must encompass a variety of perturbations. Robustness issues are not new in control system design. Presently, robustness theory requires a set of model errors combined with a suitable notion of 'nearness to instability'. Tactical weapons, Guided missiles. (JES)

Descriptors :   *GUIDED MISSILES, ADDITIVES, ALGORITHMS, CLOSED LOOP SYSTEMS, CONVERGENCE, DYNAMICS, EIGENVALUES, ERRORS, FEEDBACK, MODELS, MONTE CARLO METHOD, OPEN LOOP SYSTEMS, PERTURBATIONS, SEARCHING, STABILITY, TACTICAL WEAPONS, THEORY.

Subject Categories : Guided Missiles
      Statistics and Probability

Distribution Statement : APPROVED FOR PUBLIC RELEASE