TY - JOUR
T1 - Active stabilization of slung loads in high speed flight using cable angle feedback
AU - Scaramal, Mariano
AU - Enciu, Jacob
AU - Horn, Joseph
N1 - Publisher Copyright:
Copyright © 2018 by AHS International, Inc. All rights reserved.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - This paper addresses the problem of active stabilization of slung loads at high speed flight. To demonstrate the method, simulations of a utility helicopter with a dynamic inversion controller (as its automatic flight control system) and a CONEX cargo container were used. An airspeed scheduled controller utilizing cable angle feedback was designed for the nonlinear coupled system by the classic root locus technique. Nonlinear simulations of straight and level flight at different airspeeds were used to validate the controller performance in stabilizing the load pendulum motions. Controller performance was also evaluated in complex maneuvers with different levels of turbulence. The results show that the use of cable angle feedback provides or improves system stability when turbulence is not included in the simulation. When light/moderate turbulence is present sustained limit cycle oscillations are avoided by the use of the controller. For severe turbulence levels, the controller did not provide any significant improvement.
AB - This paper addresses the problem of active stabilization of slung loads at high speed flight. To demonstrate the method, simulations of a utility helicopter with a dynamic inversion controller (as its automatic flight control system) and a CONEX cargo container were used. An airspeed scheduled controller utilizing cable angle feedback was designed for the nonlinear coupled system by the classic root locus technique. Nonlinear simulations of straight and level flight at different airspeeds were used to validate the controller performance in stabilizing the load pendulum motions. Controller performance was also evaluated in complex maneuvers with different levels of turbulence. The results show that the use of cable angle feedback provides or improves system stability when turbulence is not included in the simulation. When light/moderate turbulence is present sustained limit cycle oscillations are avoided by the use of the controller. For severe turbulence levels, the controller did not provide any significant improvement.
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M3 - Conference article
AN - SCOPUS:85054497079
VL - 2018-May
JO - Annual Forum Proceedings - AHS International
JF - Annual Forum Proceedings - AHS International
SN - 1552-2938
T2 - 74th American Helicopter Society International Annual Forum and Technology Display 2018: The Future of Vertical Flight
Y2 - 14 May 2018 through 17 May 2018
ER -