Accession Number : ADA087734


Title :   Stability and Control Analysis of V/STOL Type B Aircraft.


Descriptive Note : Technical rept. 1 Oct 77-30 Sep 78,


Corporate Author : ANALYTIC SCIENCES CORP READING MA


Personal Author(s) : Broussard,John R ; Berry,Paul W ; Gully,Sol W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a087734.pdf


Report Date : 31 Mar 1979


Pagination or Media Count : 187


Abstract : This report applies the tools of modern multivariable control systems analysis to an aircraft representative of a Type B V/STOL aircraft. Specifically, the AV-8A Harrier is analyzed in the low-speed, transition and hover flight regimes. New techniques for digital command augmentation system design, especially suited to precise control of a V/STOL aircraft, are developed and applied at representative flight conditions. The stability results indicate that a prime determinant of longitudinal stability in the transition and nozzle-borne flight regimes is nozzle angle; this result has an effect on the choice of trajectories to minimize aircraft stability problems. The lateral-directional stability is primarily a function of forward speed and angle of attack, with the worst case being high angle of attack, low-speed flight. To some extent, flight conditions which minimize lateral-directional stability problems accentuate longitudinal difficulties. A second major section of this report develops the theory of command-generator tracking (CGT), a very powerful control system design method.


Descriptors :   *FLIGHT CONTROL SYSTEMS , *VERTICAL TAKEOFF AIRCRAFT , *SHORT TAKEOFF AIRCRAFT , ANGLES , DIGITAL SYSTEMS , STABILITY , CONTROL SYSTEMS , HIGH VELOCITY , ANGLE OF ATTACK , LOW VELOCITY , FLIGHT , NOZZLES , CONTROL THEORY , TRAJECTORIES , HOVERING


Subject Categories : V/STOL
      Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE