Abstract
Results of several parametric ground-based simulations covering a variety of VTOL in-hover control concepts are reviewed. The systems considered are angular acceleration, rate, and attitude control, as well as translational rate control. Since many cues are severely restricted by ground-based simulation (e.g., motion, peripheral vision, and environment), some form of in-flight validation of these results is desired. Such a study has been undertaken utilizing the NASA Ames X-14B VTOL aircraft. This in-flight simulator has been configured with a fly-by-wire capability in the hover mode through an analog/digita l variable stability system. This system permits the implementation of either response-feedback or model-following type of control. A comparison of flight and ground-based data is shown for the attitude control system, with the X-14B being flown in both a tethered hover and a free-flight hover.
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