Design and evaluation of a robust feedback controller for helicopters handling externally slung loads

James Rigsby, Chiung Hsia Hung, Joseph Francis Horn

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

The handling of external loads can result in degraded handling qualities, reduced stability margins, and increased pilot workload. This paper reports on the design and analysis of a feedback controller that utilizes measurements of the external load dynamic states to reduce load swinging, thereby increasing the precision with which the external load can be handled. The controller is designed using a robust control methodology and evaluated in linear and non-linear simulations. The impact on several key handling qualities specifications are presented along with the damping ratio of the external load motion as determined from the log decrement method. The controller effectively reduces the external load swinging motion for a range of sling lengths and external load mass conditions but tends to attenuate the attitude response near the load pendulum frequency.

Original languageEnglish (US)
Pages (from-to)2193-2202
Number of pages10
JournalAnnual Forum Proceedings - AHS International
Volume3
StatePublished - Jan 1 2013
Event69th American Helicopter Society International Annual Forum 2013 -
Duration: May 21 2013May 23 2013

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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