Cable Angle Feedback Control Systems to Improve Handling Qualities for Helicopters with Slung Loads

Ivler, Christina M.; Tischler, Mark B.; Powell, J. David

doi:10.2514/6.2011-6686

Cited by 24 publications

(18 citation statements)

References 9 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13, a fixed-based piloted simulation was performed to collect pilot opinions on the three attitude command control laws. All four experimental test pilots who evaluated the control laws favored the pilot handling control laws over the baseline and load damping control laws.…”

Section: Discussion Of Design Trade-offsmentioning

confidence: 99%

“…13 for an attitude command explicit model following the control system for the JUH-60A RASCAL fly-by-wire helicopter (Ref. 15).…”

Section: Design Trade-offs With Caf For Attitude Commandmentioning

confidence: 99%

“…042008-2 Three attitude command control systems were developed in Ref. 13 to demonstrate the trade-off between load damping and handling qualities for a CAF control system: 1) Baseline control system: This control system has conventional fuselage feedback only.…”

Section: Design Trade-offs With Caf For Attitude Commandmentioning

confidence: 99%

“…In Ref. 13, it was shown through analysis and in piloted simulation that a fundamental trade-off exists between load damping and handling qualities for attitude command systems with cable angle/rate feedback. A key recommendation of that study was to implement task-tailored control laws that switch between load dampingfocused and handling qualities-focused cable angle/rate feedback (CAF) control modes depending upon the flight regime.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design and Flight Test of a Cable Angle Feedback Flight Control System for the RASCAL JUH-60 Helicopter

Ivler¹,

Powell²,

Tischler³

et al. 2014

j am helicopter soc

Self Cite

View full text Add to dashboard Cite

The ability of a helicopter to carry externally slung loads makes it very versatile for many civil and military operations. However, the piloted handling qualities of the helicopter are degraded by the presence of the slung load. A control system is developed that uses measurements of the slung load motions as well as conventional fuselage feedback to improve the handling qualities for hover/low-speed operations. Prior research has shown a fundamental trade-off between load damping and piloted handling qualities for a feedback control system with cable angle/rate feedback. A new task-tailored approach proposed and implemented herein uses a method of switching between a load damping mode and a piloted handling qualities mode. These modes provide appropriate load feedback depending on the piloting task and flight regime. This provides improved handling qualities for maneuvering flight and for improved precision load control at hover. A new mission task element for precision load placement is developed (for possible inclusion into ADS-33E-PRF) to test the ability of the cable feedback system to improve load placement task performance. The improvements provided by this control system are demonstrated in a piloted flight test on the JUH-60A RASCAL fly-by-wire helicopter. The average load set-down time was reduced by a factor of two for the 1000-lb load on a 56-ft sling.

show abstract

Section: Discussion Of Design Trade-offsmentioning

confidence: 99%

“…13 for an attitude command explicit model following the control system for the JUH-60A RASCAL fly-by-wire helicopter (Ref. 15).…”

Section: Design Trade-offs With Caf For Attitude Commandmentioning

confidence: 99%

Section: Design Trade-offs With Caf For Attitude Commandmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design and Flight Test of a Cable Angle Feedback Flight Control System for the RASCAL JUH-60 Helicopter

Ivler¹,

Powell²,

Tischler³

et al. 2014

j am helicopter soc

Self Cite

View full text Add to dashboard Cite

show abstract

“…Researchers have developed control systems that mitigate the detrimental effects of suspended load swing. Some example control strategies have included input shaping [11,5,12], cable angle feedback [13,14], and a combination of both [15,16].…”

Section: Load-repositioning Maneuvers With Simulated Pilotmentioning

confidence: 99%

An experimental remote-controlled helicopter with suspended load

Potter

Adams

Singhose

2013

2013 9th International Symposium on Mechatronics and Its Applications (ISMA)

View full text Add to dashboard Cite

This paper describes a testbed for studying externally-loaded helicopter dynamics in a controlled, indoor environment. A remotecontrolled helicopter is attached to a mechanical framework that limits the helicopter motion to pitch rotation and longitudinal translation. The framework allows a load suspended beneath the helicopter to swing freely. The helicopter position, helicopter pitch angle, and load swing angle are measured in real time. This testbed can be used to investigate the dynamic effects of changes in suspended load weight, suspension cable length, and automatic flight control system architecture. The mechanical and electrical systems are described, along with methods to minimize the forces and torques applied by the helicopter in the constrained degrees of freedom. Two example experiments are discussed.

show abstract

Adaptive control of unactuated dynamical systems through interconnections: Stability and performance guarantees

Gruenwald

Yucelen

Chakravarthy

2020

Adaptive Control & Signal

View full text Add to dashboard Cite

Summary This article studies control and performance enforcement for a class of uncertain dynamical systems that consist of actuated and unactuated portions physically interconnected to each other. The proposed approach stabilizes the overall interconnected system in the presence of unknown physical interconnections as well as system uncertainties. Performance guarantees are enforced, individually, on the actuated as well as unactuated portions of the interconnected system via this approach. For enforcing these performance guarantees, a set‐theoretic model reference adaptive control approach is used, in conjunction with linear matrix inequalities, to restrict the respective system error trajectories of the actuated and unactuated dynamics inside a priori, user‐defined compact sets. The efficacy of the proposed approach is demonstrated using simulations.

show abstract

Cable Angle Feedback Control Systems to Improve Handling Qualities for Helicopters with Slung Loads

Cited by 24 publications

References 9 publications

Design and Flight Test of a Cable Angle Feedback Flight Control System for the RASCAL JUH-60 Helicopter

Design and Flight Test of a Cable Angle Feedback Flight Control System for the RASCAL JUH-60 Helicopter

An experimental remote-controlled helicopter with suspended load

Adaptive control of unactuated dynamical systems through interconnections: Stability and performance guarantees

Contact Info

Product

Resources

About