Accession Number : ADA138058

Title :   Development and Flight Test Evaluation of an Analytical Model of the Air-to-Air Tracking Task.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Eischens,W L

PDF Url : ADA138058

Report Date : Sep 1983

Pagination or Media Count : 122

Abstract : A nonlinear simulation and a linear model are developed for an air-to-air tracking task using the A-7D DIGITAC aircraft. The nonlinear simulation includes the aircraft, flight control system, and target dynamics, and the relative kinematics between aircraft and target. The linear model represents the linearized lateral-directional aircraft dynamics, the heading angle, and the linearized lateral relative kinematics. The models were used to describe the effect of depressing the aircraft roll axis on the air-to-air tracking task using a fixed gunsight. Open loop flight tests (spiral, Dutch roll, and roll mode tests, and lateral frequency sweeps) were performed to determine the effect of depressing the roll axis on the lateral-directional dynamics. The most noticeable open loop effect was the decrease in roll mode time constant. Comparison of the flight test and nonlinear model data showed good correlation for both the mechanical flight control system and the standard control augmentation system. The linear air-to-air tracking model did not agree with flight test data due to lack of a control system in the model.

Descriptors :   *Tracking, *Flight control systems, *Flight maneuvers, Attack bombers, Digital systems, Optimization, Control theory, Kinematics, Roll, Augmentation, Yaw, Air to air, Lead angle, Aiming, Closed loop systems, Handling, Linear systems, Computerized simulation, Nonlinear systems, Aerial warfare, Flight testing, Gun sights, Aircraft guns, Comparison, Multimode, Theses

Subject Categories : Flight Control and Instrumentation
      Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE