Accession Number : AD0730150

Title :   Analysis of the FDL-8 Lifting Body Lateral-Directional Modes and Preliminary Design of a Stability Augmentation System for Subsonic Flight.

Descriptive Note : Master's thesis,

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

Personal Author(s) : Chin,Gat M.

Report Date : JUN 1971

Pagination or Media Count : 149

Abstract : The problem was to determine if the FDL-8 manned re-entry vehicle lateral-directional modes have clearly adequate pilot handling qualities in subsonic flight. If not, a SAS was to be designed. Lateral characteristics for 21 subsonic flight conditions were obtained from linearized aircraft lateral equations. Assumptions were that symmetrical reference flight conditions and small-perturbation theory apply. The characteristics compared with requirements for highest level handling qualities showed a SAS was required. A two-loop SAS was designed using Root-Locus techniques. The yaw damper loops included undesirable Roll-Spiral coupling but the roll damper, second loop suppressed the Roll-Spiral coupling. (Author)

Descriptors :   (*FLIGHT CONTROL SYSTEMS, *FLIGHT CONTROL SYSTEMS), (*LIFTING REENTRY VEHICLES, SUBSONIC CHARACTERISTICS), RENDEZVOUS SPACECRAFT, ANGLE OF ATTACK, FLIGHT PATHS, ROLL, AERODYNAMIC CONTROL SURFACES, MATHEMATICAL MODELS, THESES

Subject Categories : Fluid Mechanics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE