NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
A variable structure approach to robust control of VTOL aircraftThis paper examines the application of variable structure control theory to the design of a flight control system for the AV-8A Harrier in a hover mode. The objective in variable structure design is to confine the state trajectories to a subspace of the total state space. The motion in this subspace is insensitive to system parameter variations and external disturbances that lie in the range space of the control. A switching type of control law results from the design procedure. The control system was designed to track a vector-valued velocity command. For comparison, a proportional controller was designed using optimal linear regulator theory. Both controllers were evaluated for their transient response performance using a linear model; then a nonlinear simulation study of a hovering approach to landing was conducted. The variable structure controller outperformed its linear counterpart in the presence of wind disturbances and plant parameter uncertainties afforded by the simulation.
Document ID
19840062825
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Calise, A. J.
(Drexel University Philadelphia, PA, United States)
Kramer, F. S.
(Drexel Univ. Philadelphia, PA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Journal of Guidance, Control, and Dynamics
Volume: 7
ISSN: 0731-5090
Subject Category
Aircraft Stability And Control
Accession Number
84A45612
Funding Number(s)
CONTRACT_GRANT: NAG2-8
CONTRACT_GRANT: N00019-81-C-0178
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available