Conception et optimisation d'une peau en composite pour une aile adaptative

Abstract

Economical and environmental concerns are major issues for the development of new aircraft technologies. The MDO-505 project entitled Morphing Architectures and Related Technologies for Wing Efficiency Improvement was developped in this perspective. The project objective is to design a morphing wing to improve its laminarity and therefore to reduce the fuel consumption and emissions of the aircraft. The research carried out has led to the design and the optimization of a composite morphing skin to ensure laminarity improvement while maintaining its structural integrity. First, a three-step optimization method was developped with the minimization of the composite skin mass as an objective while ensuring it best fits the target aerodynamic shapes by a morphed control surface. The optimization process also included strength, buckling and stiffness constraints. Following optimization, the optimized skin was simplified in order to ease manufacturing and to respect Bombardier Aerospace's composite design guidelines. The whole optimization process has allowed the design of a composite skin which shape deviations or errors were greatly reduced to best match the desired aerodynamic airfoils. The aerodynamic analyzes conducted on these shapes predicted significant laminarity improvement. Subsequently, a serie of analytical validations was performed to validate the structural integrity of the composite skin according to the methods generally used by Bombardier Aerospace. First, a comparative analysis was made to validate the morphing wing stiffness is similar to the original wing section. The finite element model was subsequently looped with spreadsheets to validate the buckling and the strength of the composite skin at the actual aerodynamic loads. Finally, a bolted joint analysis was performed using an internal tool named LJ 85 BJSFM-GO.v9 developed by Bombardier Aerospace. These analyzes were used to numerically validate the structural integrity of the composite skin for typical loads and material allowables.

Date	26 Jun 2014
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Simon Joncas (Supervisor) & Ruxandra Botez (Co-supervisor)