Conferences, Lectures, & Seminars
Events for February
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AME Seminar
Wed, Feb 02, 2022 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Artur Tyliszczak, CzÄstochowa University of Technology, CzÄstochowa, Slaskie, Poland
Talk Title: Passive and Active Control of Turbulent Jets and Flames -” A CFD Research
Abstract: Interest in flow control techniques is driven by a possible improvement of performance, safety and efficiency of various technical devices. Existing strategies of steering and controlling fluid flows can be divided into two approaches: passive and active. The former is based on shaping the flow domains and is usually optimized for specific flow conditions. The latter requires an external energy input (an excitation, forcing), which can be varying in response to the instantaneous flow behavior. The active methods are thus more costly but also much more flexible. Under a variety of different flow regimes, they result in a better overall response than the passive methods. In this talk, I will focus on the CFD study of passive and active control applications for jets and flames. In the latter case, proper flow control is especially important as the efficiency of combustion processes is directly related to fuel-oxidizer mixing -” a process, which we would like to have under full control. I will discuss to what extent the flow field can be modified and controlled by the selection of shapes of jet nozzles or tuning of excitation parameters.
Biography: Artur Tyliszczak is a Professor in the Faculty of Mechanical Engineering and Computer Science at CzÄstochowa University of Technology (CUT) in Poland. He leads the CFD Research Group. He earned an M.S. degree in Mechanical Engineering in 1997 from the CUT and a PhD degree in 2002 from the CUT and von Karman Institute for Fluid Dynamics (Belgium). He worked at Cambridge University (UK) as a Marie-Curie Experienced Researcher (2010-2011) and a visiting professor (2016). His group works on the development of high-order numerical methods for CFD and their applications for open and near-wall non-reacting and reacting flows. Currently, his main research concentrates on passive and active flow control in jet type flows and flows in porous and granular layers. Artur Tyliszczak is a recipient of prestigious individual awards from the Polish scientific community, the Ministry of Science and Education, the Polish Academy of Science, the Polish Association of Theoretical and Applied Mechanics. Recently he received a Senior Award from the Fulbright Commission for his stay at USC.
Host: AME Department
More Info: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Webcast: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09Location: James H. Zumberge Hall Of Science (ZHS) - 252
WebCast Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Feb 09, 2022 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Kristi Morgansen, University of Washington (AAE Chair)
Talk Title: Integrated Sensing and Actuation for Robust Flight Systems
Abstract: A fundamental element of effective operation of autonomous systems is the need for appropriate sensing and processing of measurements to enable desired system actions. Model-based methods provide a clear framework for careful proof of system capabilities but suffer from mathematical complexity and lack of scaling as probabilistic structure is incorporated. Conversely, learning methods provide viable results in probabilistic and stochastic structures, but they are not generally amenable to rigorous proof of performance. A key point about learning systems is that the results are based on use of a set of training data, and those results effectively lie in the convex hull of the training data. This presentation will focus on use of model-based nonlinear empirical observability criteria to assess and improving and bounding performance of learning pose (position and orientation) of rigid bodies from computer vision. A particular question to be addressed is what sensing data should be captured to best improve the existing training data. The particular tools to be leveraged here focus on the use of empirical observability gramian techniques being developed for nonlinear systems where sensing and actuation are coupled in such a way that the separation principle of linear methods does not hold. These ideas will be discussed relative to both engineering applications in the form of motion planning for range and bearing only navigation in autonomous vehicles, vortex position and strength estimation from pressure measurements on airfoils, and effective strain sensor placement on insect wings for inertial measurements.
Biography: Kristi Morgansen received a BS and a MS in Mechanical Engineering from Boston University, respectively in 1993 and 1994, an S.M. in Applied Mathematics in 1996 from Harvard University and a PhD in Engineering Sciences in 1999 from Harvard University. Until joining the University of Washington, she was first a postdoctoral scholar then a senior research fellow in Control and Dynamical Systems at the California Institute of Technology. She joined the William E. Boeing Department of Aeronautics and Astronautics in the summer of 2002 as an assistant professor and is currently Professor and Chair of the department. She is also co-Director of the UW Space Policy and Research Center (UW SPARC) and is the Director of the Washington NASA Space Grant Consortium. She has received a number of awards, most recently Fellow of AIAA and member of the Washington State Academy of Sciences.
Professor Morgansens research interests focus on nonlinear systems where sensing and actuation are integrated, stability in switched systems with delay, and incorporation of operational constraints such as communication delays in control of multi-vehicle systems. Applications include both traditional autonomous vehicle systems such as fixed-wing aircraft and underwater gliders as well as novel systems such as bio-inspired underwater propulsion, bio-inspired agile flight, human decision making, and neural engineering. The results of this work have been demonstrated in estimation and path planning in unmanned aerial vehicles with limited sensing, vorticity sensing and sensor placement on fixed wing aircraft, landing maneuvers in fruit flies, joint optimization of control and sensing in dynamical systems, and deconfliction and obstacle avoidance in autonomous systems and in biological systems including fish, insects, birds, and bats.
Prof. Morgansens research focuses on guidance, navigation, control for autonomous underwater, surface, air and space systems. She is an advocate for project-based learning, inclusive engineering, multidisciplinary collaboration, and STEAM.
More Info: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Webcast: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09Location: James H. Zumberge Hall Of Science (ZHS) - 252
WebCast Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Advanced Manufacturing Seminar
Fri, Feb 11, 2022 @ 10:00 AM - 11:30 AM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Vijay Srinivasan, Engineering Laboratory, National Institute of Standards and Technology
Talk Title: Emergence of Biotechnology Platforms During COVID-19: A Lesson in Modern Biology
Abstract: The COVID-19 pandemic has accelerated the development and manufacturing of vaccines at an unprecedented rate. This has been enabled by the emergence of biotechnology platforms such as mRNA and Viral Vectors. In this seminar, I will outline the engineering aspects of such platforms and the modern biology behind their evolution.
Biography: Dr. Vijay Srinivasan is a Senior Advisor in the Engineering Laboratory at the National Institute of Standards and Technology, Gaithersburg, Maryland. He joined NIST in 2009, after 26 years at IBM Research during which he was also an Adjunct Professor at the Columbia University, New York. Dr. Srinivasan has published widely and is a Fellow of ASME and AAAS.
Host: Center for Advanced Manufacturing
More Info: Registration link: https://usc.zoom.us/webinar/register/WN_ldAXMSAaT2iL638ngk5IZw
Webcast: Registration link: https://usc.zoom.us/webinar/register/WN_ldAXMSAaT2iL638ngk5IZwWebCast Link: Registration link: https://usc.zoom.us/webinar/register/WN_ldAXMSAaT2iL638ngk5IZw
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: Registration link: https://usc.zoom.us/webinar/register/WN_ldAXMSAaT2iL638ngk5IZw
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Feb 16, 2022 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Gustaaf Jacobs, San Diego State University
Talk Title: Where do flows separate and how does that affect the optimal control location?
Abstract: Flow separation can degrade performance in many engineering systems, through reduced lift, increased drag, and decreased efficiency. To alleviate the effects of flow separation on aerodynamic performance, active flow control has been considered since the inception of the field of aerodynamics. Open-loop flow control strategies based on various actuator technologies -” such as plasma actuators, fluidic oscillators, and synthetic jets -” have been shown to effectively alter separated flows, and in some cases to even yield complete reattachment. Most analyses start from the placement of an actuator at an intuitively optimal location near the separation point and/or near the Kutta condition. Optimal placement, however, requires a detailed understanding of non-linear flow separation and wake feedback that is often counterintuitive. In this talk, I will discuss recent developments in Lagrangian analysis of flow separation. This kinematic analysis promises the objective identification of separation lines as zero-mass flux "material"' lines whose footprint is analytically defined from first-principle. The separation profiles start with a subtle upwelling of Lagrangian fluid tracers upstream of the separation point. Using a data-driven technique (using DNS data) I will show that these upwelling locations may well point to optimal actuator locations that require minimal control effort.
Biography: Professor Jacobs received a M.Sc. in Aerospace Engineering from the Delft University of Technology in 1998, where after graduation, he was appointed to a Research Associate. He received a Ph.D. in Mechanical Engineering from the University of Illinois at Chicago. Following graduation in 2003, he was appointed Visiting Assistant Professor in the Division of Applied Mathematics at Brown University. He later combined this position with a Postdoctoral Fellowship at the Department of Mechanical Engineering at the Massachusetts Institute of Technology. As of 2006 he was appointed Assistant Professor of Aerospace Engineering at San Diego State University and was promoted to Associate Professor in 2010 and Full Professor in 2014. In 2001 he received the Provosts Award for Graduate Research at the University of Illinois at Chicago. In 2002, he was awarded a University Fellowship at the University of Illinois. He received an AFOSR Young Investigator Award in 2009. He became an Associate Fellow of AIAA in 2013. The research interests of Professor Jacobs can broadly be defined in the area of computational multiphase, and multiscale flow physics modeling and simulation using high-order methods. Emphasis is on simulation and analysis of particle-laden flows and flow separation in complex geometries, to aid flow control relating to combustion optimization and drag reduction.
Host: AME Department
More Info: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Webcast: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09Location: James H. Zumberge Hall Of Science (ZHS) - 252
WebCast Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Special Seminar
Thu, Feb 17, 2022 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Neda Maghsoodi, California Institute of Technology
Talk Title: Nonlinear Dynamics of Soft Filaments: From Biology to Engineering
Abstract: Filaments of soft materials such as rubber and biopolymers can easily undergo large complex deformations under external stimuli. Soft filaments offer exciting applications in engineering, life science, and medicine since their nonlinear conformational changes can be harnessed for robust functional mechanisms. Understanding the dynamics of soft filaments is fundamental to advancing future engineering and medical applications. In this talk, I present analytical models for two fascinating soft filaments that function in the nonlinear regime; 1) protein filaments forming the contractile injection machinery of the virus bacteriophage T4, and 2) photoactivated liquid crystal elastomeric (LCEs) filaments proposed for future soft robotics. I present dynamic models for both filaments based on continuum rod theory to predict their dynamical nonlinear behaviors. For context, bacteriophage T4 is an intriguing nano-scale injection machine that infects the bacterium E. coli (its host) by rupturing the cell membrane and then injecting its genome into the host cell. The injection process is initiated when the injection machine, composed of protein filaments, undergoes a nonlinear conformational change to drive the T4 needle into the host. Photomechanical LCEs are engineered, light-sensitive polymers that undergo large reversible deformations under illumination. For these systems, I show how phage T4 exploits large deformations of the protein filaments for efficient DNA injection, and how one can harness nonlinear deformations of LCE filament to generate periodic motions under steady illumination. These findings have significant implications for designing future biomedical devices and bio-inspired soft robotics.
Biography: Neda Maghsoodi is a postdoctoral scholar at the California Institute of Technology (CalTech). Neda received her Ph.D. in Mechanical Engineering in 2019 and her M.Sc. in Biomedical Engineering in 2017 from the University of Michigan-Ann Arbor. Prior to joining the University of Michigan, she earned her B.Sc. and M.Sc. both in Mechanical Engineering from Iran. Her research lies at the interface of applied mechanics, materials science, and biology and develops novel theoretical models to elucidate nonlinear dynamics of soft filaments at a broad range of time- and length-scales. In her academic career, Neda was named a Rising Star in Mechanical Engineering by UC-Berkeley (2020), received the Best Paper award in the ASME International Conference on Micro- and Nanosystems, and received the Best B.Sc. Thesis award of the year from the Iranian Society of Acoustics and Vibration. The novelty and significance of her Ph.D. research have been featured in Biophysical Journal as the New and Notable Article and in several news outlets.
Host: AME Department
More Info: https://usc.zoom.us/j/95277955610
Webcast: https://usc.zoom.us/j/95277955610WebCast Link: https://usc.zoom.us/j/95277955610
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/95277955610
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
AME Seminar
Wed, Feb 23, 2022 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: James Hanna, UN Reno
Talk Title: Exterior algebra and the proportional selective modification of dynamical systems, from rotors to nonlinear lattices
Abstract: This is the story of a seemingly trivial problem, born of quarantine, that surprised me by turning into something more interesting. I will introduce a new technique for adding dissipation or otherwise modifying dynamical systems to selectively change any number of conserved quantities, while only reducing the total number of conserved quantities by one. I will first present a naive approach to a simple example, a textbook problem of a specially damped rotor often used to explain the failure of the Explorer 1 satellite. Then (in joint work with M. Aureli), we generalize the approach to any number of dimensions and conserved quantities. The resulting dynamics drives the modified system to a nontrivial state of the original system.
Biography: Hanna is Associate Professor in the department of Mechanical Engineering at the University of Nevada, Reno, which he joined in 2019 as a refugee fleeing the great purge of unapologetic mechanicians from Virginia Tech. A lapsed materials scientist, he spent several years impersonating a postdoctoral physicist at UMass Amherst, and currently performs mechanics without a license. He is interested in applications of geometry to theoretical and experimental classical mechanics, and is currently thinking about shell buckling, cable snapping, pseudomomentum and material symmetry, new formulations of elasticity, and a few other things.
Host: AME Department
More Info: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Webcast: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09Location: James H. Zumberge Hall Of Science (ZHS) - 252
WebCast Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
Audiences: Everyone Is Invited
Contact: Tessa Yao
Event Link: https://usc.zoom.us/j/93987337017?pwd=MWd2dXBSL1FaR1RPaHNscjJ1NW80UT09
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
