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Application and flight test of linearizing transformations using measurement feedback to the nonlinear control problemThe design of nonlinear controllers has relied on the use of detailed aerodynamic and engine models that must be associated with the control law in the flight system implementation. Many of these controllers were applied to vehicle flight path control problems and have attempted to combine both inner- and outer-loop control functions in a single controller. An approach to the nonlinear trajectory control problem is presented. This approach uses linearizing transformations with measurement feedback to eliminate the need for detailed aircraft models in outer-loop control applications. By applying this approach and separating the inner-loop and outer-loop functions two things were achieved: (1) the need for incorporating detailed aerodynamic models in the controller is obviated; and (2) the controller is more easily incorporated into existing aircraft flight control systems. An implementation of the controller is discussed, and this controller is tested on a six degree-of-freedom F-15 simulation and in flight on an F-15 aircraft. Simulation data are presented which validates this approach over a large portion of the F-15 flight envelope. Proof of this concept is provided by flight-test data that closely matches simulation results. Flight-test data are also presented.
Document ID
19910020840
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Antoniewicz, Robert F.
(NASA Hugh L. Dryden Flight Research Center Edwards, CA., United States)
Duke, Eugene L.
(NASA Hugh L. Dryden Flight Research Center Edwards, CA., United States)
Menon, P. K. A.
(Georgia Inst. of Tech. Atlanta., United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1991
Subject Category
Aircraft Stability And Control
Report/Patent Number
NAS 1.60:3154
NASA-TP-3154
H-1629
Accession Number
91N30154
Funding Number(s)
PROJECT: RTOP 505-60-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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