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Meeting	ACGS Committee Meeting 124 - Williamsburg, VA - October 2019
Agenda Location	9 SUBCOMMITTEE D – DYNAMICS, COMPUTATIONS, AND ANALYSIS 9.1 F-35 Control Law Design, Development and Verification
Title	F-35 Control Law Design, Development and Verification
Presenter	Jeff Harris
Affiliation	Lockheed
Available Downloads*	presentation
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Abstract	Jeffrey J Harris, James Richard Stanford Lockheed Martin Aeronautics Company, Fort Worth, TX, 76101, USA The F-35 program will replace a number of aging fighter inventories and enhance others for the U.S. Air Force, Marine Corps, and Navy, as well as the inventories of partner/allied countries. Although the F-35A, F-35B, and F-35C have similar platforms and mission systems and share many common components, from a flight control system development perspective, they are quite unique. A novel approach to both control law design and software development was required to efficiently develop the control laws for three versions and ensure that the program met its demanding requirements. The use of nonlinear dynamic inversion as a viable control law methodology has been demonstrated on various flight control research platforms. However, the F-35 is the first production fighter to incorporate a dynamic inversion control law that operates from zero airspeed to supersonic speeds, controls the jet well beyond stall angle of attack, and provides exceptional flying qualities for operational tasks, ranging from short takeoff and vertical landing operations on U.S. Navy amphibious assault ships and large-deck carrier operations to basic fighter maneuvers. In addition, the F-35 control law software was developed based on a graphical model and auto-generated code. This was a key enabler to support software development for three F-35 versions, but it required a paradigm shift in the software development process at Lockheed Martin. This paper explores the in-depth effort of implementing a model-based control law methodology using dynamic inversion. It also provides an overview of the software development process used for F-35 flight control laws.