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Meeting	ACGS Committee Meeting 94 - Reno - November 2004
Agenda Location	9 SUBCOMMITTEE D – Dynamics, Computations and Analysis 9.3 Retrofit Reconfigurable Control of an F/A-18
Title	Retrofit Reconfigurable Control of an F/A-18
Presenter	Anthony B. Page and Jeffrey Monaco
Affiliation	Naval Air Systems Command and Barron Associates, Inc, respectively
Available Downloads*	presentation
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Abstract	The retrofit reconfigurable control system is designed to be an add-on to an existing flight control system. The in-line technique adds increments to the pilot stick commands to help eliminate undesired motions, such as axis coupling, which can result from actuator failures or other aircraft damage. The system is a model following design with on-line parameter identification provided by a modified sequential least squares algorithm and online control design provided by a receding horizon optimal control approach. A key advantage of the in-line retrofit method is that the command limiting, structural filters, and safety logic of the pre-existing control system remain in effect and need not be duplicated by the retrofit control law. The technique has undergone extensive batch simulation analysis and completed successful pilot-in-the-loop simulation evaluation. The retrofit reconfigurable controller has been hosted on the F/A-18 Fleet Support Flight Control Computer and initial real-time hardware-the-loop piloted simulation evaluations have been conducted. Flight-testing at Patuxent River Naval Air Station is scheduled for December 2004.