Aeronautics at Bio-Scales
Presented by Professor Geoffrey Spedding
University of Southern California
Aeronautics is a mature and powerful engineering discipline, and great success has been achieved in predicting flows and designing aircraft configurations at large scales, where the effects of viscosity can be modeled as minor modifications to basically inviscid dynamics. That is not the case at smaller scales, those of the new generation of drones, and of smaller birds and bats. Here the competing inertial and viscous terms in the governing equations lead to a delicate balance in solutions that have extreme sensitivity to variations in boundary and initial conditions. In this talk we will show how, in a Reynolds number regime that is only now becoming of practical interest, nominally simple problems do not necessarily have simple solutions, and how seemingly modest computational and experimental goals remain elusive. Nevertheless, with a little persistence, one can perhaps exploit these flow sensitivities for efficient and novel control strategies.
Geoffrey Spedding received his Ph.D. in 1981 from the University of Bristol, England. He began work as a Research Associate in the Department of Aerospace Engineering at the University of Southern California in the same year, where he worked on models of insect wings and models of atmospheres and oceans. He became a full Professor in 2005, and Chair of the Aerospace and Mechanical Engineering Department in 2010. His current research has three themes: (i) Geophysical Fluids: particularly the evolution of turbulence in oceans and atmospheres, and its relation to the persistence of wakes of islands and underwater vehicles; (ii) Advanced imagining and data analysis including accurate particle imagining velocimetry (PIV) techniques and novel 2D wavelet transforms and interpolation routines for scattered data; (iii) Aerodynamics of small flying devices, especially those where birds and bats coexist in engineering design space. In 2010 he was elected Fellow of the American Physical Society. In 2013 he was awarded the Chaire Joliot at ESPCI, Paris.
Harnessing thermal expansion in architected metamaterials
Presented by Professor Damiano Pasini
Mechanical Engineering, McGill University
For technology called to function under harsh temperature swings, e.g. satellite antennas, thermal expansion can be an enemy to fight against. But for others, e.g. deployable systems, thermal expansion can be an ally. In this seminar, I will contribute to address challenges currently existing on both fronts: i) how to meet strict requirements of thermal expansion in ultralightweight stiff materials, ii) how to engage temperature in morphable materials that deploy in situ under extreme conditions. The approach that I will follow draws from concepts of mechanics, geometry, materials, and structural optimization, through a combination of theory, computation and mechanical testing for performance validation.
Damiano Pasini is the Louis Scholar of the Faculty of Engineering at McGill University and Professor of Mechanical Engineering. His research interests lie in solid mechanics, advanced materials and structural optimization with current focus on mechanical metamaterials. He is fully engaged in understanding their mechanics, introducing reliable predictive models, and using them to engineer, build and test architected materials with optimally tuned functional properties that are of practical use in aerospace and other disciplines.
Shock wave focusing to achieve high energy concentration
Presented by Professor Alexander Smits
Mechanical and Aerospace Engineering, Princeton University
Biology offers a rich source of inspiration for the design of novel propulsors with the potential to overcome and surpass the performance of traditional propulsors for the next generation of underwater vehicles. To-date, however, we have not achieved the deeper understanding of the biological systems required to engineer propulsors with the high speed and efficiency of animals like sailfish, tuna, or dolphins. What is the underlying physics of the fluid-structure interaction of bio-propulsors that results in the superior performance observed in nature? Moreover, how do we replicate this performance in the next generation of man-made propulsors? Can we push beyond the limits of biology? By studying the performance of simple heaving and pitching foils, we have identified the basic scaling that describes the thrust, power and efficiency, under continuous as well as burst-coast actuation. These scaling relationships allow us to identify the natural limits on simple bio-inspired propulsors, and suggest that further improvements in performance will require adaptive flexibility and optimized profiles.
Dr. Smits is the Eugene Higgins Professor of Mechanical and Aerospace Engineering at Princeton. His research interests are centered on fundamental, experimental research in turbulence and fluid mechanics. In 2004, Dr. Smits received the Fluid Dynamics Award of the American Institute of Aeronautics and Astronautics (AIAA). In 2007, he received the Fluids Engineering Award from the American Society of Mechanical Engineers (ASME), the Pendray Aerospace Literature Award from the AIAA, and the President’s Award for Distinguished Teaching from Princeton University. In 2014, he received the Aerodynamic Measurement Technology Award from the AIAA. He is a Fellow of the American Physical Society, the American Institute of Aeronautics and Astronautics, the American Society of Mechanical Engineers, the American Academy for the Advancement of Science, the Australasian Fluid Mechanics Society, and he is a Member of the National Academy of Engineering. He is currently the Editor-in-Chief of the AIAA Journal.
Modulating the Therapeutic Microenvironment using Nanostructured Biomaterials
Presented by Professor Tejal Desai
University of California, San Francisco
The field of nanomedicine offers great potential to revolutionize clinical care, including medical devices, regenerative medicine, and molecular imaging approaches. Recent advancements in nanofabrication applied to biocompatible materials lay the groundwork for creating biomaterials with a high level of control at the molecular scale. These subtle interactions with cell and tissue assemblies can modulate properties such as mechanotransduction, adhesion, and immune activation. Nanostructured biomaterials may offer potential advantages over conventional drug delivery strategies by enhancing molecular transport and uptake. In this talk, I will discuss our recent work in developing nanostructured materials for protein and cell-based delivery as well as injectable micro/nanoscale materials for the modulation of fibrosis and immune activation. By gaining a better understanding of how small scale topographies can influence the biological microenvironment, we can design platforms for applications in therapeutic delivery and tissue regeneration.
Tejal Desai is the Ernest L Prien Endowed Professor and Chair of the Department of Bioengineering and Therapeutic Sciences within the Schools of Pharmacy and Medicine at the University of California, San Francisco (UCSF), the director of the NIH training grant for the Joint Graduate Program in Bioengineering at the University of California, Berkeley (UCB) and UCSF, and the founding director of the UCSF/UC Berkeley Masters Program in Translational Medicine. She was recently named the Inaugural Director of the UCSF Engineering and Applied Sciences Initiative known as HIVE (Health Innovation Via Engineering). Professor Desai’s research spans multiple disciplines including materials engineering, cell biology, tissue engineering, and pharmacological delivery systems to address issues concerning disease and clinical translation. She has published over 220 peer-reviewed articles, holds numerous patents, and is currently the founder of 5 start-up companies. Her research is at the cutting-edge in precision medicine, enabled by advancements in micro and nanotechnology, engineering, and cell biology directed to clinical challenges in disease treatment. By taking advantage of the current understanding of how cells respond to engineered materials and the fabrication of well-defined extracellular microenvironments, she seeks to design new platforms to overcome existing challenges in therapeutic delivery.
Her research efforts have earned recognition including Technology Review’s “Top 100 Young Innovators”, Popular Science’s Brilliant 10, and NSF’s New Century Scholar. Some of her other honors include the Eurand Grand Prize Award for innovative drug delivery technology, the Young Career Award from the Engineering in Medicine and Biology Society (IEEE EMBS), the Dawson Biotechnology award, and both the UC Berkeley and Brown University Distinguished Engineering Alumni awards. Recently, she was named Chair of the American Institute for Medical and Biological Engineering College of Fellows. In 2015, she was elected to the National Academy of Medicine. Professor Desai is a vocal advocate for STEM education and outreach to underrepresented minority students, collaborating with educational groups such as the Lawrence Hall of Science and the Exploratorium. She received her B.S. from Brown University in biomedical engineering and was awarded a Ph.D. in bioengineering jointly from UCSF and UCB.
Celebrate student innovation and creativity at the annual Johns Hopkins Engineering Design Day. Through poster sessions, presentations, and prototype demonstrations, Hopkins engineers will demonstrate their ability to apply knowledge and skills to tackle real-world challenges.
*Mechanical Engineering Senior Design Day will be held in Hodson Hall:
Presentations (Session 1): 10 a.m. to 12 p.m. (210 and 213 Hodson Hall)
Poster Session: 12 to 2 p.m. (Hodson Hall, 2nd Floor Lobby)
Presentations (Session 2) and Closing Ceremony: 2 to 5 p.m. (210 and 213 Hodson Hall)
Visit designday.jhu.edu for the full schedule of events.