Accession Number : AD0860598

Title :   Application of Frequency Domain Optimization to Improve the Lateral Stability of the F-4 Aircraft.

Descriptive Note : Master's thesis,

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

Personal Author(s) : O'Brien, Patrick D.

Report Date : JUN 1969

Pagination or Media Count : 73

Abstract : A study is made on the problem of adverse yaw due to roll rate for a high performance fighter aircraft in a combat cruise configuration. A performance index is developed to eliminate this problem and to improve the lateral stability of the aircraft. The theory of multivariable frequency domain optimization is explained and a computational algorithm is given. This algorithm is then applied to the problem at hand, and one iteration is performed. Time histories of the bare airframe and the airframe with the optimum open loop controller are compared, and a significant reduction in adverse yaw can be seen. (Author)

Descriptors :   (*TACTICAL AIR SUPPORT, JET FIGHTERS), (*JET FIGHTERS, AERODYNAMIC CHARACTERISTICS), (*AERODYNAMIC CONTROL SURFACES, OPTIMIZATION), CLOSE SUPPORT, ANGLE OF ATTACK, YAW, ROLL, TURNING FLIGHT, AERIAL RUDDERS, DEFLECTION, STABILITY, OSCILLATION, RESPONSE, NUMERICAL ANALYSIS, ALGORITHMS, MATHEMATICAL MODELS, EQUATIONS OF MOTION, ITERATIONS, THESES.

Subject Categories : Attack and Fighter Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE