A flight path generation algorithm for the development and preliminary assessment of mission task elements

A flight path generation (FPG) algorithm that calculates control inceptor commands required for complex maneuvering flight was developed. This tool was used in previous work to simulate non-piloted aerobatic maneuvers of a conventional and compound H-60. The flight path tool models a generalized flight path with a series of straight and turning segments. A mode that generates minimum time flight paths using load factor and roll rate constraints is the focus. This study seeks to extend the application of this flight path tool to the development and assessment of mission task elements for next generation rotorcraft. In particular, the rotorcraft model examined is a notional compound H-60 featuring a wing and pusher propeller. A basic flight control system was developed using Nonlinear Dynamic Inversion (NLDI) control architecture. Two flight demonstration maneuvers are examined in piloted simulation: a break turn and a descent turn. The break turn is a high speed turning maneuver where the objective is to turn through 90 deg. as quickly as possible. The flight path tool can provide minimum time criteria given an airspeed range, maximum vertical load factor, and maximum roll rate. The descent turn is similar to a wind-up turn and requires the pilot to perform a spiraling dive through a target change in horizontal flight path angle. Although specific performance metrics were not explored for this maneuver, the FPG tool was used to regenerate the piloted flight path and thus demonstrate the ability of the FPG to accurately replicate generalized piloted maneuvers.