A Hybrid Reduced-Order Model for the Aeroelastic Analysis of Flexible Subsonic Wings: A Parametric Assessment Articles uri icon

publication date

  • July 2018

start page

  • 1

end page

  • 23

issue

  • 3

volume

  • 5

International Standard Serial Number (ISSN)

  • 2226-4310

abstract

  • A hybrid reduced-order model for the aeroelastic analysis of flexible subsonic wings with arbitrary planform is presented within a generalised quasi-analytical formulation, where a slender beam is considered as the linear structural dynamics model. A modified strip theory is proposed for modelling the unsteady aerodynamics of the wing in incompressible flow, where thin aerofoil theory is corrected by a higher-fidelity model in order to account for three-dimensional effects on both distribution and deficiency of the sectional air load. Given a unit angle of attack, approximate expressions for the lift decay and build-up are then adopted within a linear framework, where the two effects are separately calculated and later combined. Finally, a modal approach is employed to write the generalised equations of motion in state-space form. Numerical results were obtained and critically discussed for the aeroelastic stability analysis of a uniform rectangular wing, with respect to the relevant aerodynamic and structural parameters. The proposed hybrid model provides sound theoretical insights and is well suited as an efficient parametric reduced-order aeroelastic tool for the preliminary multidisciplinary design and optimisation of flexible wings in the subsonic regime.

keywords

  • hybrid reduced-order model; quasi-analytical; aeroelasticity; flexible wings; subsonic