Accession Number:

ADA279089

Title:

Design of Robust Optimal Control Systems and Stability Analysis of Real Structured Uncertainties

Descriptive Note:

Final rept. Aug 1990-Mar 1994

Corporate Author:

DREXEL UNIV PHILADELPHIA PA

Personal Author(s):

• Chang, Bor-Chin
• Yousuff, Ajmal

Report Date:

1994-03-01

Pagination or Media Count:

149.0

Abstract:

This report addresses the computational problems arising in the design of robust controllers via H-inf optimization and mu-synthesis and proposes several new controller reduction approaches. Through our discovery of the convexity and monotonicity properties of the general parameter dependent H- inf Riccati equation, a quadratically convergent algorithm which is faster than the other existing search schemes is developed to compute the optimal H-inf norm. It is desired to preserve the closed-loop stability and performance while reducing the order of the controller. A structured truncation technique based on the closed-loop controllability and observability diagrams, an H-inf controller parameterization and reduction method, and an observer-based controller parameterization and reduction procedure are employed to achieve this objective.

Descriptors:

• *OPTIMIZATION
• *FLIGHT CONTROL SYSTEMS
• *RICCATI EQUATION
• *CONTROL THEORY
• ALGORITHMS
• STABILITY
• PARAMETERS
• CLOSED LOOP SYSTEMS
• AUTOMATIC GAIN CONTROL
• TRUNCATION
• SOLUTIONS(GENERAL)
• REDUCTION
• SYNTHESIS
• COMPUTATIONS
• CONTROL SYSTEMS

Subject Categories:

• Flight Control and Instrumentation
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE