A recent consideration in aircraft design is the use of folding wing tips, with the aim of enabling higher aspect ratio wings with less induced drag but also meeting airport gate limitations. Of particular interest is the concept of using in flight free-floating wing tips in order to reduce aircraft gust and maneuver loads. This study investigates the effects of local geometric nonlinearities on the dynamic stability, postflutter behavior and gust response of floating wing tips. A multibody formulation is introduced to account for finite rotations of rigid folding wing tips attached through hinges on a flexible airframe structure including also aerodynamic follower forces for the folding wing tip components. It is found that the postflutter behavior is characterized by super-critical limit cycle oscillations and no subcritical instability was observed for the analyzed cases. Moreover, the wing tip gust response can vary significantly when geometric nonlinearities are accounted for whereas a small impact was observed on the main airframe structure.

Unsteady aeroelastic analysis of the semi aeroelastic hinge including local geometric nonlinearities / Mastracci, Paolo; Saltari, Francesco; Mastroddi, Franco; Wilson, Thomas; Castrichini, Andrea. - In: AIAA JOURNAL. - ISSN 0001-1452. - 60:5(2022), pp. 3147-3165. [10.2514/1.j061108]

Unsteady aeroelastic analysis of the semi aeroelastic hinge including local geometric nonlinearities

Paolo Mastracci
Primo
;
Francesco Saltari
Secondo
;
Franco Mastroddi;
2022

Abstract

A recent consideration in aircraft design is the use of folding wing tips, with the aim of enabling higher aspect ratio wings with less induced drag but also meeting airport gate limitations. Of particular interest is the concept of using in flight free-floating wing tips in order to reduce aircraft gust and maneuver loads. This study investigates the effects of local geometric nonlinearities on the dynamic stability, postflutter behavior and gust response of floating wing tips. A multibody formulation is introduced to account for finite rotations of rigid folding wing tips attached through hinges on a flexible airframe structure including also aerodynamic follower forces for the folding wing tip components. It is found that the postflutter behavior is characterized by super-critical limit cycle oscillations and no subcritical instability was observed for the analyzed cases. Moreover, the wing tip gust response can vary significantly when geometric nonlinearities are accounted for whereas a small impact was observed on the main airframe structure.
2022
aeroelasticity; folding wings; geometric non-linearity
01 Pubblicazione su rivista::01a Articolo in rivista
Unsteady aeroelastic analysis of the semi aeroelastic hinge including local geometric nonlinearities / Mastracci, Paolo; Saltari, Francesco; Mastroddi, Franco; Wilson, Thomas; Castrichini, Andrea. - In: AIAA JOURNAL. - ISSN 0001-1452. - 60:5(2022), pp. 3147-3165. [10.2514/1.j061108]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1684550
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