This paper presents a method to compute the set of steady state autorotation conditions from which safe flare to landing through can be performed. Equations of motion of a helicopter in autorotation through wind shear are presented; these equations are used to compute an optimal trajectory to landing from candidate initial states (distance and height above the touchdown point, horizontal speed, descent rate, rotor speed) to a designated touchdown point. The effect of wind shear on these optimal trajectories and on the set of safe initial conditions is examined for two rotorcraft: the Bell OH-58A and a small electric-powered helicopter. The feasibility of using waypoint following control for autorotation landing is examined for the electric-powered helicopter.
|Original language||English (US)|
|Number of pages||12|
|Journal||Annual Forum Proceedings - AHS International|
|State||Published - Sep 9 2013|
|Event||69th American Helicopter Society International Annual Forum 2013 - |
Duration: May 21 2013 → May 23 2013
All Science Journal Classification (ASJC) codes