Analysis of the FDL-8 Lifting Body Lateral-Directional Modes and Preliminary Design of a Stability Augmentation System for Subsonic Flight.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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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
- Fluid Mechanics
- Unmanned Spacecraft