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The Scientific World Journal
Volume 2015 (2015), Article ID 523914, 10 pages
Research Article

Helicopter Control Energy Reduction Using Moving Horizontal Tail

College of Aviation, Erciyes University, 38039 Kayseri, Turkey

Received 7 November 2014; Revised 14 February 2015; Accepted 1 April 2015

Academic Editor: Zheng Zheng

Copyright © 2015 Tugrul Oktay and Firat Sal. 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.


Helicopter moving horizontal tail (i.e., MHT) strategy is applied in order to save helicopter flight control system (i.e., FCS) energy. For this intention complex, physics-based, control-oriented nonlinear helicopter models are used. Equations of MHT are integrated into these models and they are together linearized around straight level flight condition. A specific variance constrained control strategy, namely, output variance constrained Control (i.e., OVC) is utilized for helicopter FCS. Control energy savings due to this MHT idea with respect to a conventional helicopter are calculated. Parameters of helicopter FCS and dimensions of MHT are simultaneously optimized using a stochastic optimization method, namely, simultaneous perturbation stochastic approximation (i.e., SPSA). In order to observe improvement in behaviors of classical controls closed loop analyses are done.