LRecently evolved multivariable deripn teehniques are used to develop a digital task-tailored control system for the Advanced Fithter Technology Integration (AFTI)/F-16 shown in Figure I . The design method employs output feedback. This paper presents the results of a preliminary design study u s i n g the AFT1 vehicle as the aerodynamic model.The dceign is tailored to .the air-to-air gunnery tank.Direct forcc crpabilities of the aircraft are blended with conventional maneuvering abilitie6 to improve performance. A compatlhle independent fuselnge pointing system Is developed for use in an automated fire-flight control system.Realistic constraints, including control surface position limits and rate limits, are imposed e a r l y in the system desipn with some surprising a c t desirable results.Emphasis is placed on developinp a control system with Food performance and stphility that does not require e x c e s s i v e pilot compensation to accomplish combat maneuvering. A means of allowing pilot control of multiple input systems is devised that does not increase pilot workload. The Neal-Smith Criterion is used to predict pilot handling quality ratings for the system. It also S P T Y~S a s a means of identifying improvements that reduce pilot workload.The impact n f these changes i n reported in the paper. Figure 1. AFTIIF-16 Aircraft * Aerospace Engineer. AFTIJF-16 Advanced Development Program
** Professor of Electrical EnpineeringConsideration is given to developing B reliable design which minimizes thr possibility of undesirable structural and aerodynamic instabilities. Designs are accomplFshed at a number of points i n the flight envelope usinl: a computer aided design package called M'LTI.The design method provides very fast and essentially decoupled aircraft control. The best means to recouple the aircraft for comhnt-type maneuvers i.s imestigated.The paper concludes with a comparison with other designs f o r the aircraft and a discussion of tmprovements that vould considerably aid the design effnrt.
INTRODUCTIONThe design considered In this paper is a full authority digital fly-hy-wire system. Reliabjlity and fliRht safety are paramount issues.The system is tailored for the air-to-air comhat task. Frnphasis is placed on the development of a pmrrical design.
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