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  • 1.  Tech talks in September

    Posted 01 Sep, 2021 23:38
    Section Members,

    AFRL is sponsoring the following tech talks in September as part of their Summer Faculty Fellowship Program.  Outside audiences are welcome and I encourage you to attend if the topic is interesting to you.  Note that all times are Central.


    • 2 Sept 21 from 1000-1100

    TitleIntegration and Deployment of "Blue" Flight Controllers with AFRL Research UAS

    Presenter:  Dr. Justin Bradley, University of Nebraska-Lincoln

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    • 2 Sept 2021 from 1300-1400

    TitleTowards virtual testing and evaluation

    Presenter:  Dr. Oana Cazacu, University of FL-REEF, Shalimar, FL 

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    • 9 Sept 2021 from 1000-1200

    TitleExploration of Nanocomposite Binder for Embedded Structural Health Monitoring in Energetic Materials

    PresenterDr. Gary Seidel, Virginia Polytechnic Institute and State University

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    • 9 Sept 2021 from 1300-1400

    TitleTopology Optimization of High Velocity Multifunctional Structures

    Presenter:  Dr. Jamie Guest, John Hopkins University

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09

    • 23 Sept 2021 from 1300-1400

    TitleStatistical Methods for Spoofing Detection and Position Recovery in GPS-Based Navigation

    PresenterDr. Arda Vanli, FAMU-FSU College of Engineering

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    • 30 Sept 2021 from 1000-1100 C

    TitleEffects of Fluid Thermal Structural Interactions on a High-Speed Airframe

    PresenterDr. Phillip Deierling, University of Iowa

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    • 30 Sept 2021 from 1300-1400

    TitleCritical Elements Detection in Networks: An Optimization Perspective

    PresenterDr. Oleg A. Prokopyev, University of Pittsburgh

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Abstracts, Bios, and additional details for talks listed below:

    _____________________________________________________________________________________

    2 Sept 21 from 1000-1100

    Title:  "Integration and Deployment of "Blue" Flight Controllers with AFRL Research UAS"

    Presenter:  Dr. Justin Bradley, University of Nebraska-Lincoln

    Abstract: Presentation abstract: Air superiority is evolving to incorporate intelligent vehicles, distributed systems, and more targeted and persistent Intelligence, Surveillance, and Reconaissance (ISR), often in the face of GPS-denied scenarios. As a result, estimation of position and velocity using local sensors and data is critical to overcome GPS jammers or failure. Due to cybersecurity threats, recently Unmanned Aircraft Systems (UAS) researchers have had to retool their vehicles to account for new directives to use autopilot products made exclusively in the USA. This has forced many UAS labs to rethink their deployments strategies, both hardware and software. The UF REEF lab near Eglin AFB is funded by AFRL and is working to become the defacto USAF UAS lab to demonstrate research capabilities on real vehicles. However, they have yet to transition to "Blue" autopilots (those made in the USA) or flying outdoors. Simultaneously, within the NIMBUS lab at UNL, we lack any GPS-denied capability which we desire for "last mile" navigation to a target ensuring success under GPSdenied circumstances. Our efforts in this SFFP directly addressed these by integrating a Blue autopilot (Blue Cube) into existing REEF UAS, integrating the REEF estimator and Blue Cube, developing a scalable software deployment mechanism for UAS, a custom GUI for flight testing operations, and developing relationships with researchers and understanding of the state-of-the-art in estimation research in USAF.

    Biography:  Justin Bradley is an Associate Professor in the Computer Science and Engineering department at the University of Nebraska-Lincoln. He holds a B.S. in computer engineering (2005) and M.S. in electrical engineering (2007) from Brigham Young University, and M.S. (2012) and Ph.D. (2014) degrees in aerospace engineering from the University of Michigan. He has worked with Unmanned Aircraft Systems (UAS) for over 15 years, starting at the Multi-AGent Intelligent Coordination and Control (MAGICC) lab at BYU, the A2Sys lab at the University of Michigan, and most recently as a co-director of the Nebraska Intelligent MoBile Unmanned System (NIMBUS) lab since 2015. He is a recipient of a 2021 NSF CAREER award. Justin's research lies at the intersection of computing, control, and aerospace disciplines. Of particular interest are themes of decision and control, control software, and robot autonomy in aerospace systems. A common theme in his research is developing algorithms that can dynamically adjust their resource utilization in response to uncertainty, adjusting performance as needed to meet demands.

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    _____________________________________________________________________________________

    2 Sept 2021 from 1300-1400

    Title"Towards virtual testing and evaluation"

    Presenter:  Dr. Oana Cazacu, University of FL-REEF, Shalimar, FL 

    AbstractCurrently, effectiveness is quantified late in the design/development process after arena testing has been done. In this talk are presented highlights of the research done as part of the 2021 SFFP that builds on the accomplishments of the theoretical and computational mechanics group at the UF-REEF over the past decade and the improved understanding of the physics gained from the valuable interactions and exchanges of ideas during the fellowship. While the illustrative examples presented pertain to heterogeneous cementitious targets, the framework is general and may lead to further development of predictive modeling and simulations capabilities for evaluation in a digital environment. 

    BiographyOana Cazacu is Charles E. Taylor Professor in the Department of Mechanical and Aerospace Engineering, University of Florida-REEF. She earned a Ph.D. and Habilitation degree (HDR) from University of Lille, France in 1995 and 2004, respectively. She is Editor of the Plasticity of Materials book series (Elsevier), Associated Editor of Mechanics Research Communications (Elsevier) and of the International Journal of Material Forming (Springer). Her main research interests lie in theoretical and computational mechanics. Major contributions include development of widely used models for lightweight metals, now included in the built-in materials libraries of DoD, DoE, commercial and academic finite-element codes. She has authored and co-authored 2 books, 13 book chapters, edited and co-edited 4 books, and she has 100+ papers in refereed international journals, and 90 + plenary, keynote, and invited lectures. She has been recipient of visiting fellowships and chair professorships in Europe (e.g. Paris-Sorbonne, Univ. Lille; Univ. Lorraine, France; Univ. Carlos III Madrid, Spain) and Australia. 

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    ____________________________________________________________________________________

    9 Sept 2021 from 1000-1200

    Title"Exploration of Nanocomposite Binder for Embedded Structural Health Monitoring in Energetic Materials"

    PresenterDr. Gary Seidel, Virginia Polytechnic Institute and State University

    Abstract:  The focus of the work presented here is on the exploration of nanocomposite binders in constructing embedded strain and damage sensing networks within certain classes of energetic materials.  Specifically, by controlling the amount of carbon nanotubes dispersed within the binder, the level of thermo-electro-mechanical coupling obtained through the piezoresistive coefficient can be tuned.  While the strain and damage sensing have been qualitatively demonstrated experimentally and quantitatively demonstrated via mesoscale modeling, correlating the strain and damage sensing directly with the void and damage state has yet to be accomplished.  Here we will present some of the results of our collaborative efforts with AFRL focused on establishing meso-structure–property–performance relationships in energetic materials.  Specifically, mock energetic materials with carbon nanotube enriched binders have been characterized via x-ray microtomography prior to and after compression to failure testing, with emphasis on a statistical assessment of the presence of defects and damage.  During the compression testing, changes in sample resistance associated with the piezoresistive response of the nanocomposite binder are monitored in an effort to correlate the increase in observed defects with the observed piezoresistive response.  In addition, the microtomography images obtained are used to generate representative volume elements for use in a multiscale electro-thermo-mechanically coupled peridynamics formulation.  Mesoscale simulations of impact allow for detailed correlation between microscale features, damage initiation and propagation events, and localized frictional heating with effective piezoresistive response, and are therefore expected to be instrumental in providing an understanding of how identify and perhaps even triangulate classes of damage entities and locations of hot spot formation. 

    Biography:  Dr. Gary D. Seidel is an Associate Professor in the Kevin T. Crofton Department of Aerospace and Ocean Engineering, and an Affiliate Faculty member in Mechanical Engineering and Biomedical Engineering and Mechanics.  Dr. Seidel's research focuses on multiscale modeling and characterization of damage and multifunctionality in composite materials through the nano, micro, meso, and macroscales.  His present focus is on developing lightweight polymer nanocomposites for structural health monitoring in aerospace applications.  He has published 40+ journal papers and 60+ conference proceedings papers in the areas of analytical and computational micromechanics, concurrent and hierarchical multiscale modeling, progressive damage modeling, and characterizing the piezoresistive response of nanocomposite sensors.  Dr. Seidel is a Fellow in the American Society of Mechanical Engineers (ASME), an Associate Fellow in the American Institute of Aeronautics and Astronautics (AIAA)  and an active member of the Society of Engineering Science.  He serves as an Associate Editor for Applied Mechanics Reviews and for the Journal of Intelligent Material Systems and Structures, as well as serving on the editorial board for the Journal of Peridynamics and Nonlocal Modeling.  Before joining Virginia Tech as an Assistant Professor in 2008, Dr. Seidel was a Postdoctoral Research Associate and Lecturer in the Aerospace Engineering Department at Texas A&M University and part of the Texas Institute of Intelligent Bio-Nano Materials and Structures for Aerospace Vehicles (TiiMS).

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    _____________________________________________________________________________________

    9 Sept 2021 from 1300-1400

    TitleTopology Optimization of High Velocity Multifunctional Structures

    Presenter:  Dr. Jamie Guest, John Hopkins University

    Abstract: Topology optimization is an automated computational design tool with a demonstrated history of discovering efficient structural concepts.  Despite its tremendous potential, however, topology optimized solutions are often suboptimal when considering design objectives, manufacturing processes, and operating conditions that are relevant for structures used in aero applications.  Solutions must therefore often undergo significant post-processing and re-design which is both detrimental to structural performance and time consuming.  This talk will discuss recent advancements in topology optimization to close this gap, including consideration of mechanical properties that go beyond maximum elastic stiffness design (buckling, natural frequencies, etc), design for improved manufacturability, and design for combinations of properties towards multifunctionality.  Examples will focus on design of structures and components for optimized mass and mechanical properties.  Extensions to other physics and the design of architected (cellular) materials will also be highlighted.

    Biography: Jamie Guest is an Associate Professor and Interim Chair of the Department of Civil and Systems Engineering at  Johns Hopkins University, and is currently Deputy Director of the Johns Hopkins Center for Additive Manufacturing and Architected Materials. He has served on the Editorial Board for multiple journals, including Structural and Multidisciplinary Optimization, ASME Journal of Mechanical Design, and ASCE Journal of Structural Engineering.  He received the 2015 EMI Leonardo da Vinci Award and the Walter L. Huber Research Prize in 2017, both from the ASCE.  Jamie received his PhD in Civil and Environmental Engineering from Princeton University and BSE in Civil Engineering Systems from the University of Pennsylvania.  

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    _____________________________________________________________________________________

    23 Sept 2021 from 1300-1400

    Title:  "Statistical Methods for Spoofing Detection and Position Recovery in GPS-Based Navigation"

    PresenterDr. Arda Vanli, FAMU-FSU College of Engineering

    AbstractIn this research, we study quickest change detection methods for detecting and isolating structured spoofing attacks on GPS pseudorange measurements. In particular, we consider the spoofing attacks that slowly pull the captured satellite pseudorange measurements from the truth and may escape traditional detectors that consider abrupt changes. We develop a cumulative-sum (CUSUM) change detector for linear ramp type spoof attacks and a change-point estimator for the spoofing-attack starting time. An extensive Monte Carlo simulation study is conducted to investigate the contributions of different atmospheric error contributions on spoofing detection. In addition, a case study that considers a real GPS data for a moving ground target in an urban environment is presented to illustrate the methodology. It is demonstrated how the change-point estimates can be used, following the detection of a spoofed satellite, to recover the position estimate of the vehicle by omitting contaminated satellite signals from the solution. 

    BiographyDr. Arda Vanli is an Associate Professor in the Industrial and Manufacturing Engineering Department at Florida A&M University and Florida State University, College of Engineering. Dr. Vanli's research is in the areas of statistical quality control, reliability engineering and applied statistics. In particular, he is interested in developing methodologies for risk analysis and abnormality detection in complex systems, variability reduction in manufacturing systems and robust estimation for navigation.  Dr. Vanli is the recipient of the Air Force Research Laboratory (AFRL) Summer Faculty Fellowship Program (SFFP) award in 2019, working at Air Force Institute of Technology, Dayton, OH and in 2020, working at the Munitions Directorate of Eglin Air Force Base. He completed his Ph.D. in Industrial Engineering at the Pennsylvania State University in 2007, M.S. in Mechanical Engineering at the Pennsylvania State University in 2000 and B.S. in Mechanical Engineering from the Middle East Technical University, Turkey in 1998. 

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    _____________________________________________________________________________________

    30 Sept 2021 from 1000-1100 Central

    Title"Effects of Fluid Thermal Structural Interactions on a High-Speed Airframe"

    PresenterDr. Phillip Deierling, University of Iowa

    Abstract:  The focus of this talk is to demonstrate a method for determining the effective thermostructural response of spatially tailored metal-ceramic composite monocoque airframe during high-speed flight using finite element analysis (FEA). The typical development of a high-speed airframe is a two step design process. First, the outer mold line (OML) of the structure is established by assuming no deformation of the structure takes place during the aerothermodynamic analysis. During this analysis a worst case scenario (trajectory, operating conditions, etc.), which in many cases may or not be correct, is used. Second, with the OML established, features of the structure are examined. For instance, the thickness and materials of the OML and the thermal protection system (TPS). The benefit of this method is that it greatly reduces the amount of time to complete the design. Finally, similar to many engineering design operations, a factor of safety is applied to the design to account for unknown design variables or loading conditions, which can result in increased weight, reduced operating envelope, etc. However, it has been well established that airframes operating at high-speeds are subjected to complex coupling of fluid, thermal, and structural interactions (FTSI). In FTSI, the interaction of the fluid and temperature fields results in deformation of the structure, which in turn results in changes to the flow field and thus, the temperature of the structure. This unique coupling can result in the creation of different worst case scenarios that can drastically change the design approach.

    Biography:  Phillip Deierling is an Associate Professor of Instruction of Mechanical Engineering at the University of Iowa. He received his BSE and MS in 2009 and 2010, respectively, after which he was a design and analysis engineer at  DANA Holding Corporation in Maumee, OH. He received his PhD from the University of Iowa in 2016. He is a recipient of a National Research Council Post-Doc Fellowship working with the Munitions Directorate of the U.S. Air Force Research Laboratory at the Eglin Air Force Base in Florida. He has received several teaching related awards while at the University of Iowa. His research interest are in the areas of computational solid mechanics of composites, thermostructural analysis and fluid-thermal-structural interactions.

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    _____________________________________________________________________________________

    30 Sept 2021 from 1300-1400

    Title:  "Critical Elements Detection in Networks: An Optimization Perspective"

    PresenterDr. Oleg A. Prokopyev, University of Pittsburgh

    Abstract:  Graph-theoretical models arise in a variety of application areas due to their elegance and inherent ability to logically represent (as edges) important relationships, e.g., communication and transportation links, between structural elements (i.e., nodes) of complex systems. An interesting research question arising in this context is the problem of identifying the most important and influential structural elements (e.g., nodes, edges, subgraphs) of the considered networks. There are two fundamentally different viewpoints for measuring element importance within the network. In the first approach (also known as the "negative" approach) the decision-maker evaluates the effect of elements removal on the network structure, e.g., its connectivity. In the second ("positive") approach the decision-maker focuses on how well a particular subset of the network elements is positioned within a network, e.g., with respect to reachability to other elements. In recent years, this stream of research has received significant attention in the literature. This talk will mostly focus on the "negative" approach, which is also known to as the Critical Nodes/Edges/Structures Detection problem. The concept of critical nodes and edges can be used to characterize vulnerability and robustness properties of a given networked system with respect to node and edge removals, which may correspond to either targeted attacks, or random failures due to operating conditions. In this talk, we overview some recent results and the lessons learned from the application of combinatorial optimization approaches for solving this important class of network analysis problems.

    Bio: Dr. Oleg Prokopyev is a Professor in the Department of Industrial Engineering at the University of Pittsburgh. He received MS and PhD degrees in industrial and systems engineering from the University of Florida and BS and MS degrees in applied mathematics and physics from Moscow Institute of Physics and Technology (Moscow, Russia). Dr. Prokopyev's research interests are in the areas of combinatorial optimization, bilevel programming, optimization under uncertainty, and applications of Operations Research in health care, bioinformatics and network analysis. His research has been supported by the National Science Foundation, Air Force Office of Scientific Research (AFOSR), Office of Naval Research, Department of Veteran Affairs and the Defense Threat Reduction Agency. Dr. Prokopyev is a recipient of the AFOSR Young Investigator Program (YIP) Award. He is the Co-Editor-in-Chief of Optimization Letters and serves on the editorial boards of IISE Transactions and Journal of Global Optimization.

    Join ZoomGov Meeting:

    https://www.zoomgov.com/j/1612146248?pwd=YlovTndNWGpJbDV3WldRQnFmYUNSQT09 

    Meeting ID: 161 214 6248

    Passcode: 983676

    One tap mobile

    +16692545252,,1612146248# US (San Jose)

    +16468287666,,1612146248# US (New York)

    ____________________________________________________________________________________



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    Ryan Sherrill
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