Affiliation:
1. Dassault-Aviation, 92210 St. Cloud, France
2. Laboratoire Jacques-Louis Lions, Sorbonne Université, 75005 Paris, France
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 parameterized with the help of a CAD modeler, and we optimize it with the SLSQP algorithm. The drag, computed with the help of a RANS method, is used as the aerodynamic criterion. For the stealth criterion, a function is derived from the radar cross-section in a given cone of directions and 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.
Reference34 articles.
1. Knott, E.F., Schaeffer, J.F., and Tulley, M.T. (2004). Radar Cross Section, SciTech Publishing.
2. Aliaga, C., Kopp, M., Salui, K.B., Mahapatra, D., and Sardesai, A. (July, January 27). Aerodynamic and stealth studies of canard-wing Configurations at Transonic Speeds using Ansys Fluent & Ansys HFSS SBR+. Proceedings of the AIAA AVIATION 2022 Forum, Chicago, IL, USA.
3. Lee, D., Gonzalez, L.F., Srinivas, K., Auld, D., and Periaux, J. (2007–11, January 8). Multi-objective/multidisciplinary design optimisation of blended wing body UAV via advanced evolutionary algorithms. Proceedings of the 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, USA.
4. Wu, D., Long, T., Li, Y., Jiang, M., and Huang, B. (2014, January 16–20). Aero-structure-stealth coupled optimization for high aspect ratio wing using adaptive metamodeling method. Proceedings of the 15th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Atlanta, GA, USA.
5. Numerical Optimization on Aerodynamic/Stealth Characteristics of Airfoil Based on CFD/CEM Coupling Method;Jiang;Trans. Nanjing Univ. Aeronaut. Astronaut.,2016