Abstract
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.
| Original language | English (US) |
|---|---|
| Journal | Annual Forum Proceedings - AHS International |
| Volume | 2018-May |
| State | Published - Jan 1 2018 |
| Event | 74th American Helicopter Society International Annual Forum and Technology Display 2018: The Future of Vertical Flight - Phoenix, United States Duration: May 14 2018 → May 17 2018 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
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Active stabilization of slung loads in high speed flight using cable angle feedback. / Scaramal, Mariano; Enciu, Jacob; Horn, Joseph Francis.
In: Annual Forum Proceedings - AHS International, Vol. 2018-May, 01.01.2018.Research output: Contribution to journal › Conference article
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 Francis
PY - 2018/1/1
Y1 - 2018/1/1
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
VL - 2018-May
JO - Annual Forum Proceedings - AHS International
JF - Annual Forum Proceedings - AHS International
SN - 1552-2938
ER -