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A discrete-time state-space model with wake interference for stability analysis of flexible aircraft

Murua, J, Palacios, R and Graham, JMR (2011) A discrete-time state-space model with wake interference for stability analysis of flexible aircraft In: International Forum of Aeroelasticity and Structural Dynamics., 2011-06-26 - 2011-06-30, Paris, France.

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Abstract

This paper investigates the coupled aeroelastic and flight dynamics stability of flexible lightweight aircraft. The aerodynamics are modelled by the discrete-time unsteady vortex lattice method, which can capture the large deformations of the lifting surfaces, and includes 3-D effects and in-plane motions. A geometrically-exact composite beam formulation is used to model the nonlinear flexible-body dynamics, including rigid-body motions, and the equations are accommodated to discrete-time formulation. The governing equations are linearised around an equilibrium configuration, which can be highly deformed, performing a small perturbation analysis and assuming a frozen aerodynamic geometry. The resulting framework is a monolithic discrete-time state-space formulation, which provides a powerful tool for the stability boundary prediction of a flexible vehicle through a direct generalized eigenvalue analysis. It offers increased fidelity as compared to traditional tools, and at very low computational cost. As a suitable test case to illustrate the capabilities of this approach, the flutter of a T-tail is examined. In addition, previous open-loop results are extended in order to asses wake interference effects on flexible aircraft dynamics.

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 14 Nov 2012 14:20
Last Modified: 23 Sep 2013 19:37
URI: http://epubs.surrey.ac.uk/id/eprint/714256

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