Stability and Open-Loop Dynamics of Very Flexible Aircraft Including Free-Wake Effects

Murua, J, Hesse, H, Palacios, R and Graham, JMR (2011) Stability and Open-Loop Dynamics of Very Flexible Aircraft Including Free-Wake Effects In: AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials., 2011-04-04 - 2011-04-11, Denver, CO, USA.

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Abstract

The paper investigates the coupled nonlinear aeroelasticity and flight mechanics of very flexible lightweight aircraft. A geometrically-exact composite beam formulation is used to model the nonlinear flexible-body dynamics, including rigid-body motions. The aerodynamics are modeled by a general 3-D unsteady vortex-lattice method, which can capture the instantaneous shape of the lifting surfaces and the free wake, including large displacements and interference effects. The coupled governing equations are solved in a variety of ways, allowing linear and nonlinear time-domain simulations of the full vehicle and frequency-domain linear stability analysis around trimmed configurations. The resulting framework for the Simulation of High-Aspect Ratio Planes (SHARP) provides a medium-fidelity representation of flexible aircraft dynamics, based on an intuitive and easily linearizable structural representation using displacements and the Cartesian rotation vector, time-domain aerodynamics, and at relatively low computational costs. Previous verification studies on the structural dynamics and aerodynamics modules are complemented here with studies on the flexible-body implementation and on the integrated simulation methodology. A numerical investigation is finally presented on a representative high-altitude long-endurance model aircraft, investigating its stability properties and its open-loop dynamic response.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Divisions :	Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :	Name Email ORCID Murua, J Hesse, H Palacios, R Graham, JMR
Date :	5 April 2011
Depositing User :	Symplectic Elements
Date Deposited :	28 Mar 2017 14:08
Last Modified :	31 Oct 2017 15:10
URI:	http://epubs.surrey.ac.uk/id/eprint/714253

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