
SMARTAIR
Self-guided machine learning algorithms for real-time assimilation, interpolation and rendering of flow data

Abstract
The proposed project addresses several major challenges encountered in the assimilation of measurement data in aerodynamic testing.
Optimization plays a central role in the design of current and future transportation systems such as trains, airplanes or automobiles. The objective is to develop designs with reduced energy consumption, smaller environmental footprint and increased customer comfort. For this, numerical simulations and experimental tests are being performed, both with their own set of constraints such as turnover times and cost. The Institute of Fluid Dynamics (IFD) operates a wind tunnel for such testing, and the research is focused on the development of novel, efficient measurement techniques to enhance the science data return from such cost-intensive facilities.
The proposed project will focus on two central problems limiting the productivity of experimental aerodynamic test campaigns. Strategies using machine learning will be developed to dynamically assimilate acquired data into a global description of the flow field being measured. Predictive analysis of the data will be employed to direct the measurements process towards regions of significant information as the global knowledge evolves. The measurement time will be reduced relying on adaptive guidance based on real-time data interpretation. The software design will explicitly include the option of a human operator in the loop.
The collaboration between SDSC and IFD offers an attractive way to merge complementary competencies. The tasks of aerodynamic flow field reconstruction, uncertainty quantification and probe guidance will be broken down into distinct activities / work packages such as:
- Development of learning algorithms for sparse flow data assimilation using physics-based constraint models.
- Real-time implementation of the software in a suitable computing infrastructure.
- Testing and evaluation of the complete hardware/software system in situ in the wind tunnel facility at IFD.
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Benjamín Béjar received a PhD in Electrical Engineering from Universidad Politécnica de Madrid in 2012. He served as a postdoctoral fellow at École Polytechnique Fédérale de Lausanne until 2017, and then he moved to Johns Hopkins University where he held a Research Faculty position until Dec. 2019. His research interests lie at the intersection of signal processing and machine learning methods, and he has worked on topics such as sparse signal recovery, time-series analysis, and computer vision methods with special emphasis on biomedical applications. Since 2021, Benjamin leads the SDSC office at the Paul Scherrer Institute in Villigen.


Fernando received a PhD. in Electrical Engineering from the Technical University of Madrid. He has been a member of the technical staff at Bell Labs and a Machine Learning Research Scientist at Amazon. Fernando has been a visiting professor at Princeton University under a Marie Curie Fellowship and an associate professor at University Carlos III in Madrid. He held positions at the Gatsby Unit (London), Max Planck Institute for Biological Cybernetics (Tuebingen), and BioWulf Technologies (New York). Since 2022, Fernando is the Deputy Executive Director of the SDSC.


Victor has joined the SDSC in 2020 to design solutions for data-driven optimization problems. His research interests lie at the crossroad of machine learning and decision-making. This contains several topics such as stochastic optimization, reinforcement learning, combinatorial optimization, and probabilistic graphical models. Victor received a PhD in operations research and machine learning from Ecole des Ponts Paristech in 2020. Before that, he completed a master degree in Operation Research and Machine learning at Ecole des Ponts Paristech and a bachelor degree in Applied Mathematics and Computer Sciences.
description
Problem:
Measuring the flow field surrounding an object using the probe system gives a continuous stream of data. Based on this data, the goal of this interactive procedure is the volumetric reconstruction of the mean properties (flow direction, magnitude) and derived quantities (vorticity, stream-lines, etc.) of the flow field with the highest fidelity in minimal time. To do so, we aim at developing a machine learning method that can reconstruct the flow field based on the incoming data. In addition, we aim at reducing the experiment time using a machine learning tool identifying significant regions of interest where further acquisition will help to reduce the uncertainties and improve the information about the flow field.
Impact:
the real-time capability of the algorithm as well as its adaptive aspect will give an optimized probe trajectory. It will provide improvements on the real-time signal reconstruction process.
Tasks:
The SDSC will lead the WPs related with the development of the machine learning tools. First, the SDSC will help to improve the current flow field reconstruction algorithm. Second, the SDSC will develop a generic real-time algorithm that targets the location where sampling might reduce the uncertainty about the flow field. Third, it will contribute to the implementation of the algorithm in the guided probe software.
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Additionnal resources
Bibliography
- A. Gisberts, G. Metta (2013).Real-time model learning using Incremental Sparse Spectrum Gaussian Process Regression. Neural Networks, vol. 41, pp. 59-69.
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