Towards Universal Parameterization: Using Variational Autoencoders to Parameterize Airfoils

Towards Universal Parameterization: Using Variational Autoencoders to Parameterize Airfoils

Swannet, K. (TU Delft Flight Performance and Propulsion)
Varriale, Carmine (TU Delft Flight Performance and Propulsion)
Doan, Nguyen Anh Khoa (TU Delft Aerodynamics)

2024

A design can only be as good as its mathematical representation. In engineering design optimization, the chosen method of parameterization can have significant impact on the outcomes. This paper introduces a novel methodology for airfoil design parameterization utilizing variational autoencoders (VAEs), a class of neural networks known for their proficiency in reducing dimensionality. However, a significant challenge with VAEs is the interpretability of the encoded latent space. This work aims to address this issue by creating a network with an interpretable latent space, yielding parameters that are understandable to humans. The effectiveness of this approach is evaluated using the comprehensive UIUC airfoil database, which offers a diverse range of airfoil shapes for analysis. We show that a VAE can successfully extract key features of airfoil geometries and parameterize them using six parameters, which show a clear correlation with airfoil properties in a way that remains understandable by the designer. Additionally, it smoothly interpolates the data points, allowing the generation of new airfoils and thus offering a practical and interpretable airfoil parameterization.

http://resolver.tudelft.nl/uuid:2ebb06e8-2c85-40e2-8630-1a3d2ce1750d

https://doi.org/10.2514/6.2024-0686

American Institute of Aeronautics and Astronautics Inc. (AIAA)

978-1-62410-711-5

Proceedings of the AIAA SCITECH 2024 Forum

AIAA SCITECH 2024 Forum, 2024-01-08 → 2024-01-12, Orlando, United States

Institutional Repository

conference paper

© 2024 K. Swannet, Carmine Varriale, Nguyen Anh Khoa Doan