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Assessment of Wake-Tail Interference Effects on the Dynamics of Flexible Aircraft

Murua, J, Palacios, R and Graham, JMR (2012) Assessment of Wake-Tail Interference Effects on the Dynamics of Flexible Aircraft AIAA Journal, 50 (7). 1575 - 1585. ISSN 0001-1452

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Abstract

This work investigates the effect of aerodynamic interference in the coupled nonlinear aeroelasticity and flight mechanics of flexible lightweight aircraft at low speeds. For that purpose, a geometrically exact composite-beam formulation is used to model the vehicle flexible-body dynamics by means of an intuitive and easily linearizable representation based on the displacement and Cartesian rotation vectors. The aerodynamics are modeled using the unsteady vortex-lattice method, which captures the instantaneous shape of the lifting surfaces and the free inviscid wake, including large deformations and interference effects. This results in a framework for simulation of high aspect ratio planes that provides a medium-fidelity representation of flexible-aircraft dynamics with a modest computational cost. Previous independent studies on the structural-dynamics and aerodynamics modules are complemented here with the integrated simulation methodology, including vehicle trim, and linear and nonlinear time-domain solutions. A numerical investigation is next presented on a simple wing-fuselage-tail configuration, assessing the interference effects between wing wake and horizontal tail, and the downwash due to the proximity of the wake is shown to play a significant role in the longitudinal dynamics of the vehicle. Finally, a brief discussion of direct wake-tail encounters is included to show the limitations of the approach.

Item Type: Article
Additional Information: Copyright AIAA. This is the final accepted version of an article published in the AIAA Journal 50 (7), July 2012. The published version may be found at: http://dx.doi.org/10.2514/1.J051543
Uncontrolled Keywords: Free wake, Aerodynamic interference, Flexible aircraft, Flight dynamics, Aeroelasticiy, Vortex lattice method
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 20 Nov 2012 10:25
Last Modified: 23 Sep 2013 19:37
URI: http://epubs.surrey.ac.uk/id/eprint/714250

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