Article
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Gradient Based Aero-Stealth Optimization of a Simplified Aircraft
Version 1
: Received: 22 May 2024 / Approved: 29 May 2024 / Online: 29 May 2024 (09:10:29 CEST)
How to cite: Thoulon, C.; Roge, G.; Pironneau, O. Gradient Based Aero-Stealth Optimization of a Simplified Aircraft. Preprints 2024, 2024051903. https://doi.org/10.20944/preprints202405.1903.v1 Thoulon, C.; Roge, G.; Pironneau, O. Gradient Based Aero-Stealth Optimization of a Simplified Aircraft. Preprints 2024, 2024051903. https://doi.org/10.20944/preprints202405.1903.v1
Abstract
Modern fighter aircraft increasingly need to conjugate aerodynamic performance and low observability. In this paper we showcase a methodology for a gradient-based bidisciplinary aero-stealth optimization. The shape of the aircraft is parametrized with the help of a CAD modeler, and we optimize with the SLSQP algorithm. The drag, computed with the help of a RANS method, is used as the aerodynamic criterion. The stealth criterion, a function is derived from the radar cross section in a given cone of directions, weighed with a function whose goal is to cancel the electromagnetic intensity in a given direction. Stealth is achieved passively by scattering back the electromagnetic energy away from the radar antenna and no energy is absorbed by the aircraft, which is considered as a perfect conductor. A Pareto front is identified by varying the weights of the aerodynamic and stealth criteria. The Pareto front allows for an easy identification of the CAD model corresponding to a chosen aero-stealth trade-off.
Keywords
Multidisciplinary Optimization; Shape Optimization; Gradient-Based; CAD-Based; Aerodynamics; Stealth; Radar Cross-Section
Subject
Engineering, Aerospace Engineering
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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