I.I. Glass Lecture

UTIAS is pleased to host two distinguished scholars this term:

Dr. Hanspeter Schaub

Using Machine Learning for Astrodynamics Applications

Abstract

The use of machine learning and neural networks has become an enabling technology for spacecraft operations and mission development. This talk discusses recent work in the Autonomous Vehicle Systems (AVS) lab at the University of Colorado to research means to schedule spacecraft tasking operations using a shielded neural network. Both single and collaborative multi-satellite scenarios are discussed with Earth imaging mission scenarios. The goal is to develop scalable scheduling solutions that can are efficient to compute on-board, robust to uncertainties in spacecraft and trajectory modeling, require minimal communication across satellites, and finally is robust to satellites being added or removed from operations. In these studies the training is performed with the open-source physics-based Basilisk spacecraft simulation framework. Further, exciting results are presented on using machine learning and physics informed neural networks to model the complex gravity fields of celestial bodies. The neural networks are storage efficient, accurate down to the surface of an asteroid without diverging (unlike spherical harmonics) and are very promising for on-orbit gravity field estimation applications.

Biography

Dr. Schaub is a distinguished professor and chair of the University of Colorado aerospace engineering sciences department. He holds the Schaden leadership chair. He has over 28 years of research experience, of which 4 years are at Sandia National Laboratories. His research interests are in astrodynamics, relative motion dynamics, charged spacecraft motion as well as spacecraft autonomy. This has led to about 208 journal and 326 conference publications, as well as a 4th edition textbook on analytical mechanics of space systems. Dr. Schaub has been the ADCS lead in the CICERO mission, the ADCS algorithm lead on a Mars mission and supporting ADCS for a new asteroid mission. In 2023 he won the Hazel Barnes Price, the top award granted to faculty at the University of Colorado. He has been awarded the H. Joseph Smead Faculty Fellowship, the Provost's Faculty Achievement Award, the faculty assembly award for excellence in teaching, as well as the Outstanding Faculty Advisor Award. He is a fellow of AIAA and AAS, and has won the AIAA/ASEE Atwood Educator award, AIAA Mechanics and Control of Flight award, as well as the Collegiate Educator of the Year for the AIAA Rocky Mountain section, and was recently elected into the National Academy of Engineering.

Dr. Harald Kleine

Visualisation of Compressible Flows

Abstract

Density-sensitive visualisation techniques are a staple diagnostic in experimental research of compressible flows. The presentation will cover a brief review of the essential techniques of shadowgraphy, schlieren methods and interferometry and then focus on applications such as shock interaction and reflection, the instability of supersonic flows around aerospikes, the generation of blast waves as a result of a mechanical impact on paper targets, and the visualisation of rifle plumes. The facilities used in these tests are shock tubes, supersonic wind tunnels, a light gas gun and a ballistic range, and the common denominator of all tests is that the associated flow fields were investigated with the help of a set of the aforementioned visualisation techniques and a suite of high-speed cameras.

Videos:

https://www.youtube.com/watch?v=v4nFRMdKinc ; https://www.youtube.com/watch?v=JonG86KrxCM

Biography

Harald Kleine received his university degrees (Dipl.-Ing., Dr.-Ing.) from the RWTH Aachen University in Germany and then spent three years as a postdoctoral fellow at McGill University, Montreal, Canada, followed by a two-year-long employment at Med-Eng Systems in Ottawa, Canada. He then joined Tohoku University in Sendai, Japan, as Associate Professor, where he stayed for three years before moving to Australia where he became an academic staff member of the University of New South Wales on the Canberra campus (UNSW Canberra). He is currently holding the position of Associate Professor in the School of Engineering and Technology at UNSW Canberra. His main research interests include the experimental investigation of compressible flows, mainly related to the development and application of flow visualisation techniques. He has published more than 60 journal papers and more than 100 conference contributions on topics related to blast and shock waves, super- and hypersonic flows, ballistics and fire plumes.