Accession Number : ADA260793


Title :   Dynamics and Robust Control of a Sampled Data System for Large Space Structures. Volume 2. The LQG/LTR Methodology for the Discrete-time System and the Design of Reduced Order Robust Digital Controller for Orbiting Flexible Shallow Spherical Shell System.


Descriptive Note : Final rept. Sep 1989-Sep 1991


Corporate Author : HOWARD UNIV WASHINGTON DC DEPT OF MECHANICAL ENGINEERING


Personal Author(s) : Bainum, Peter M ; Guangqian, Xing ; Ericsson, Aprille J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260793.pdf


Report Date : Nov 1992


Pagination or Media Count : 67


Abstract : The analysis and design of robust controllers for multivariable discrete-time feedback systems in the frequency domain are studied. The robustness stability conditions for discrete-time systems with additive alteration, and with multiplicative alteration are developed. The robust LQG/LTR method has been extended from the continuous-time system to the discrete-time system. It has been proven that the LQG/LTR method is also valid for the LQG control of the discrete-time system with the filtering observer. As an application of the LQG/LTR technique for discrete-time systems, the design of reduced order optimal digital LQG controllers for the orbiting flexible shallow spherical shell system is considered. The comparison between the digital optimal LQG controller with the filtering observer and with the predicting observer for the orbiting flexible shallow spherical shell has been made.... Digital control, Large space structures, LQG/LTR method for discrete-time system, Robust controller design, Design of reduced order LQG controller.


Descriptors :   *CONTROL SYSTEMS , *SPACECRAFT , *DATA MANAGEMENT , *PLATFORMS , *FLEXIBLE STRUCTURES , FREQUENCY , MULTIVARIATE ANALYSIS , INPUT OUTPUT PROCESSING , FILTRATION , FREQUENCY DOMAIN , FEEDBACK , TIME , COMPARISON , OBSERVERS , ORBITS , STABILITY


Subject Categories : Astronautics


Distribution Statement : APPROVED FOR PUBLIC RELEASE