Design for bird strike crashworthiness using a building block approach applied to the Flying-V aircraft
Keywords:Bird strike, Crashworthiness, Design, Metallic, Aircraft Design, Flying wing, Blended wing-body, Flying-V
The Flying-V aircraft promises better fuel-burn performance over conventional aircraft, integrating the passenger cabin and cargo volume into the lifting surface. The wing-fuselage and cockpit windows of the Flying-V are exposed to the flight direction, posing a new challenge to the design and certification of structures in terms of bird strike. This study is a first step towards understanding the dynamic load path and contribution of each structural element on the bird strike resistance of the Flying-V leading-edge structures. The goal is to comply with EASAs certification CS-25, while keeping the structure within elastic deformations during a 70 m/s impact with a projectile simulating a 4lb bird. A building block approach (BBA) is proposed for the design for bird strike crashworthiness. At the highest building block level, a sensitivity analysis is performed to identify the effect of each structural element on the plasticity and weight of the leading-edge structures. The trends are used to modify the baseline design and achieve a reduction of 80% of the plastic energy, without any optimization scheme. A critical case of a 133 m/s speed impact of a 4lb bird at 37000 ft cruise altitude shows that there is still penetration in the modified design.
Copyright (c) 2022 Sian Ying Chen, Wydo van de Waerdt, Saullo G. P. Castro
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