Flying qualities reliability constraints in aircraft conceptual design using time-marching simulations

Saporito, Marco, Da Ronch, Andrea, Bartoli, Nathalie and Defoort, Sébastien (2021) Flying qualities reliability constraints in aircraft conceptual design using time-marching simulations. In Proceedings of the American Institute of Aeronautics and Astronautics (AIAA) 2021. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2021-3101).

Abstract

Aircraft conceptual design, especially when novel concepts are involved, is inherently affected by uncertainty. Although many efforts are done to include more physics at the earliest design phases, often information on impact of the underlying uncertainty is missing. This work proposes an approach to incorporate uncertainty into aircraft conceptual design through reliability constraints on some desired dynamic performance requirements. These are estimated from unsteady time-domain simulations through a system identification process, leveraging on three available aerodynamic fidelity levels. Uncertainty propagation is addressed by a polynomial chaos expansion technique. After presenting the structure and the validation of the proposed framework, a demonstrative application of fuel mass optimization for a transport aircraft under uncertainty is performed, with reliability constraints on short period characteristics.

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Contributors

Author: Marco Saporito

Author: Andrea Da Ronch

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