Accession Number : ADA194874

Title :   An Analysis of Lateral-Directional Handling Qualities and Eigenstructure of High Performance Aircraft.

Descriptive Note : Master's thesis,

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

Personal Author(s) : Costigan, Michael J

PDF Url : ADA194874

Report Date : Jun 1988

Pagination or Media Count : 218

Abstract : This thesis examines the relationship between an aircraft's lateral-directional handling qualities and its corresponding eigenstructure. Intuition and simple methematical models were used to develop desirable eigenvectors. For conventional aircraft, the dutch roll eigenvector was shown to a function of the roll to sideslip (phi/beta) ratio. Flight control laws to produce the desired eigenstructures were derived using eigenstructure assignment with output feedback. The control laws were based on a twelfth order linear model of the lateral-directional dynamics of the YA-7D DIGITAC, and varied the dutch roll phi/beta ratio. The handling qualities of the YA-7D were examined. The flight testing consisted of both open loop tasks, and closed loop tasks in which Cooper-Harper ratings were assigned.

Descriptors :   *FLIGHT CONTROL SYSTEMS, *SIDESLIP, *ATTACK AIRCRAFT, CLOSED LOOP SYSTEMS, CONTROL THEORY, EIGENVECTORS, FEEDBACK, FLIGHT TESTING, HANDLING, HIGH RATE, LINEAR SYSTEMS, MATHEMATICAL MODELS, OPEN LOOP SYSTEMS, OUTPUT, PERFORMANCE(ENGINEERING), QUALITY, RATIOS, ROLL, THESES

Subject Categories : Aerodynamics
      Attack and Fighter Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE