This report describes the activities and findings conducted under contract with NASA Langley Research Center. Subject matter is the investigation of suitable multivariable flight control design methodologies and solutions for large, flexible high-speed vehicles. Specifically, methodologies are to address the inner control loops used for stabilization and augmentation of a highly coupled airframe system possibly involving rigid-body motion, structural vibrations, unsteady aerodynamics, and actuator dynamics. Design and analysis techniques considered in this body of work are both conventional-based and contemporary-based, and the vehicle of interest is the High-Speed Civil Transport (HSCT). Major findings include: (1) control architectures based on aft tail only are not well suited for highly flexible, high-speed vehicles, (2) theoretical underpinnings of the Wykes structural mode control logic is based on several assumptions concerning vehicle dynamic characteristics, and if not satisfied, the control logic can break down leading to mode destabilization, (3) two-loop control architectures that utilize small forward vanes with the aft tail provide highly attractive and feasible solutions to the longitudinal axis control challenges, and (4) closed-loop simulation sizing analyses indicate the baseline vane model utilized in this report is most likely oversized for normal loading conditions.
Multivariable Techniques for High-Speed Research Flight Control Systems
1999
294 pages
Report
Keine Angabe
Englisch
Aircraft , Control systems design , Flight control , Structural vibration , Multivariable control , Supersonic transports , Stability augmentation , Aircraft control , Control simulation , Airframes , Destabilization , Longitudinal control , Rigid structures , Sequential control , Simulation , Feedback control , Aerodynamic stability , Aircraft configurations , Unsteady aerodynamics , Actuators
Robust multivariable flight control
TIBKAT | 1994
|Free flight techniques for high speed aerodynamic research
Engineering Index Backfile | 1956
|Non-linear multivariable flight control of aircraft
SAGE Publications | 1998
|