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Preliminary investigation of use of flexible folding wing tips for static and dynamic load alleviation

  • A. Castrichini (a1), V. Hodigere Siddaramaiah (a1), D.E. Calderon (a1), J.E. Cooper (a2), T. Wilson (a3) and Y. Lemmens (a4)...

Abstract

A recent consideration in aircraft design is the use of folding wing-tips with the aim of enabling higher aspect ratio aircraft with less induced drag while also meeting airport gate limitations. This study investigates the effect of exploiting folding wing-tips in flight as a device to reduce both static and dynamic loads. A representative civil jet aircraft aeroelastic model was used to explore the effect of introducing a wing-tip device, connected to the wings with an elastic hinge, on the load behaviour. For the dynamic cases, vertical discrete gusts and continuous turbulence were considered. The effects of hinge orientation, stiffness, damping and wing-tip weight on the static and dynamic response were investigated. It was found that significant reductions in both the static and dynamic loads were possible. For the case considered, a 25% increase in span using folding wing-tips resulted in almost no increase in loads.

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1. Khodaparast, H.H. and Cooper, J.E. Rapid prediction of worst case gust loads following structural modification, AIAA J, 2014, 52, (2), pp 242254.
2. Hodigere Siddaramaiah, V., Calderon, D.E., Cooper, J.E. and Wilson, T. Preliminary studies in the use of folding wing tips for loads alleviation, Royal Aeronautical Society Applied Aerodynamics Conference, 2014, Bristol, UK.
3. Albano, E. and Rodden, W.P. A doublet-lattice method for calculating lift distributions on oscillating surfaces in subsonic flows, AIAA J, 1969, 7, (2), pp 279285.
4. Rodden, W.P. and Johnson, E.H. MSC/NASTRAN Aeroelastic Analysis’ User's Guide, 1994, MacNeal-Schwendler Corp., Los Angels, CA, US.
5. Wright, J.R. and Cooper, J.E. Introduction to Aircraft Aeroelasticity and Loads, 2007, John Wiley, Hoboken, NJ, US.
6. Hoblit, F.M. Gust Loads on Aircraft: Concepts and Applications, 1988, AIAA, Washington, DC, US.

Keywords

Preliminary investigation of use of flexible folding wing tips for static and dynamic load alleviation

  • A. Castrichini (a1), V. Hodigere Siddaramaiah (a1), D.E. Calderon (a1), J.E. Cooper (a2), T. Wilson (a3) and Y. Lemmens (a4)...

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