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Journal of Control Science and Engineering
Volume 2016 (2016), Article ID 4195491, 14 pages
Research Article

Stability Analysis of a Helicopter with an External Slung Load System

Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 1DL, UK

Received 20 November 2015; Revised 18 April 2016; Accepted 4 May 2016

Academic Editor: Francisco Gordillo

Copyright © 2016 Kary Thanapalan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper describes the stability analysis of a helicopter with an underslung external load system. The Lyapunov second method is considered for the stability analysis. The system is considered as a cascade connection of uncertain nonlinear system. The stability analysis is conducted to ensure the stabilisation of the helicopter system and the positioning of the underslung load at hover condition. Stability analysis and numerical results proved that if desired condition for the stability is met, then it is possible to locate the load at the specified position or its neighbourhood.