Accession Number : ADA192758

Title :   An Application of Eigenspace Methods to Symmetric Flutter Suppression.

Descriptive Note : Final rept.,

Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA

Personal Author(s) : Fennell, Robert E

PDF Url : ADA192758

Report Date : Jan 1988

Pagination or Media Count : 22

Abstract : An eigenspace assignment approach to the design of parameter insensitive control laws for linear multivariable systems is presented. The control design scheme utilizes flexibility in eigenvector assignments to reduce control system sensitivity to changes in system parameters. The methods involve use of the singular value decomposition to provide an exact description of allowable eigenvectors in terms of a minimum number or design parameters. In a design example, the methods are applied to the problem of symmetric flutter suppression in an aeroelastic vehicle. In this example the flutter mode is sensitive to changes in dynamic pressure and eigenspace methods are used to enhance the performance of a stabilizing minimum energy/linear quadratic regulator controller and associated observer. Results indicate that the methods provide feedback control laws that make stability of the nominal closed loop systems insensitive to changes in dynamic pressure. Keywords: Stabilization; Eigenspace methods; Flutter suppression.

Descriptors :   *CONTROL THEORY, *FLUTTER, *AERODYNAMIC STABILITY, AEROELASTICITY, CLOSED LOOP SYSTEMS, CONTROL, CONTROL SYSTEMS, DECOMPOSITION, DYNAMIC PRESSURE, EIGENVECTORS, FEEDBACK, LINEAR SYSTEMS, MULTIVARIATE ANALYSIS, PARAMETERS, SENSITIVITY, SUPPRESSION, SYMMETRY, VEHICLES

Subject Categories : Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE