Slung load stabilization across the flight envelope using an active cargo hook

A. Singh, J. Enciu, J. F. Horn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


A control methodology for stabilizing an external load using an active cargo hook is demonstrated in simulation. A test load exhibiting instabilities in the form of high amplitude limit cycle oscillations in forward flight is used. A previous study used full-state feedback linear-quadratic regulator to stabilize the load across the flight envelope. This paper will examine the use of output feedback and a reduced order model with relative cable feedback in a linear-quadratic regulator controller. The initial design is tested on a model of an isolated load in a wind tunnel and demonstrated in a single airspeed to provide positive load stability for the originally unstable load. The controller gains are then scheduled across the flight envelope. Simulations with a coupled system of a UH-60 Black Hawk helicopter using an active cargo hook with an external load demonstrate stability across the flight envelope in still air. The efficiency of the active cargo hook controller is finally checked in the presence of varying turbulence intensities.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
StatePublished - Jan 1 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum


ConferenceAIAA Scitech Forum, 2019
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering


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