The Green Regional Aircraft (GRA), one of the six CleanSky platforms, represents the largest European effort toward
the greening of next generation air transportation through the implementation of advanced aircraft technologies.
In this framework researches were carried out to develop an innovative wing flap enabling airfoil morphing according to
two different modes depending on aircraft flight condition and flap setting:
- Camber morphing mode. Morphing of the flap camber to enhance high-lift performances during take-off and landing
- Tab-like morphing mode. Upwards and downwards deflection of the flap tip during cruise (flap stowed) for load
control at high speed and consequent optimization of aerodynamic efficiency.
A true-scale flap segment of a reference aircraft (EASA CS25 category) was selected as investigation domain for the
new architecture in order to duly face the challenges posed by real wing installation issues especially with reference to
the tapered geometrical layout and 3D aerodynamic loads distributions. The investigation domain covered the flap region
spanning 3.6 m from the wing kink and resulted characterized by a taper ratio equal to 0.75 with a root chord of 1.2 m.
High TRL solutions for the adaptive structure, actuation and control system were duly analyzed and integrated while
assuring overall device compliance with industrial standards and applicable airworthiness requirements.
R. Pecora, F. Amoroso, and M. Magnifico, "Toward the bi-modal camber morphing of large aircraft wing flaps: the CleanSky experience," Proc. SPIE 9801, Industrial and Commercial Applications of Smart Structures Technologies 2016, 980106 (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 21, 2016; Published: 16 April 2016); https://doi.org/10.1117/12.2218415.
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