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 motion 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 velocity command defined in the body frame. For comparison purposes, a proportional controller was designed using optimal linear regulator theory. Both control designs were first evaluated for transient response performance using a linearized model, then a nonlinear simulation study of a hovering approach to landing was conducted. Wind turbulence was modeled using a 1052 destroyer class air wake model.
Document ID
19830055927
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Calise, A. J. (Drexel Univ. Philadelphia, PA, United States)
Kramer, F. (Drexel University Philadelphia, PA, United States)