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X-ORIGINAL-URL:https://aero.iisc.ac.in
X-WR-CALDESC:Events for Department of Aerospace Engineering
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TZID:Asia/Kolkata
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20250116T110000
DTEND;TZID=Asia/Kolkata:20250116T130000
DTSTAMP:20260414T211302
CREATED:20250115T054120Z
LAST-MODIFIED:20250115T054120Z
UID:10000048-1737025200-1737032400@aero.iisc.ac.in
SUMMARY:Ph.D. (Engg): Transonic shock buffet in an axial flow fan
DESCRIPTION:Transonic shock buffet\, a self-sustained shock oscillation resulting from shock-boundary layer interaction\, is observed across a range of operating points on the performance map of a transonic axial flow fan. Shock oscillations impart time-varying air loads on fan blades with the potential of leading to fatigue-induced structural failure. Accurate estimations of shock buffet onset\, shock displacement\, and buffet frequency are critical to lifing assessment of turbomachinery blades. This study focuses on predicting transonic shock buffet in a transonic axial flow fan using high-fidelity numerical simulations\, followed by investigation of its underlying mechanisms through wave propagation analysis and modal analysis of buffet flow. Steady flow solutions obtained using a RANS solver predict performance characteristics and capture key features of the fan’s shock structure in conformation with experimental and numerical results from the literature. Unsteady flow simulations on a full-annulus model using URANS successfully capture shock buffet and its salient attributes at two operating points—near design mass flow and near stall. Wave propagation analysis and spectral proper orthogonal decomposition of buffet flow reveal a feedback loop of upstream and downstream propagating pressure perturbation waves driving shock buffet. Subtle modification to Lee’s buffet model is proposed for accurately predicting buffet frequency in a turbomachinery context. Buffet flow is characterized by circumferential\, radial\, and stream-wise pressure perturbation waves\, with circumferential flow periodicity breaking down during buffet. A global stability analysis framework is presented and its prognostic potential for predicting shock buffet in turbomachinery is evaluated. The global stability analysis framework enables accurate prediction of buffet frequencies and associated modes with drastically reduced computational cost compared to that required for unsteady simulations. Finally\, the aeromechanical response of the fan to buffet-induced unsteady air loads is assessed. The buffet frequencies do not excite resonant blade vibrations or buffeting but induce an alternating mis-staggering structural response in the fan blades due to aerodynamic mistuning arising of buffet flow. In summary\, we have shown\, for the first time\, transonic shock buffet in an axial flow fan can be captured using a full-annulus simulation. Further\, this study advances the understanding of transonic shock buffet mechanisms\, demonstrating robust methodologies for predicting shock buffet\, and assessing its aeromechanical implications in turbomachinery. \n  \nSpeaker : Jyoti Ranjan Majhi \n  \nResearch Supervisor: Prof. Kartik Venkatraman.
URL:https://aero.iisc.ac.in/event/ph-d-engg-transonic-shock-buffet-in-an-axial-flow-fan/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2025/01/Jyoti-.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241219T090000
DTEND;TZID=Asia/Kolkata:20241220T173000
DTSTAMP:20260414T211302
CREATED:20241219T044539Z
LAST-MODIFIED:20241219T044539Z
UID:10000045-1734598800-1734715800@aero.iisc.ac.in
SUMMARY:Two-Day Short Course on Mathematics and Computing of Risk\, Reliability and Resilience in Network and Enterprise Systems
DESCRIPTION:This course is designed to familiarize the students with the mathematical concepts and computational techniques in quantifying the risk\, reliability and resilience (RRR) of large\, complex systems\, in the presence of multiple types of uncertainty. Often the information available for RRR analysis is heterogeneous\, coming from multiple sources (models\, tests\, experts) and in multiple formats. The use of Bayesian methods to integrate heterogeneous information will be presented. The use of RRR quantification results in various types of decisions will be discussed\, such as system design\, manufacturing\, operations\, and sustainment. The concept and use of digital twins that continuously update the system model with incoming data to maintain high levels of system performance and resilience will be presented. Application examples from engineering systems (e.g.\, aircraft\, buildings)\, business enterprise systems (e.g.\, manufacturing and distribution supply chains)\, and civil infrastructure systems (e.g.\, power grid\, transportation) will be used to illustrate the RRR techniques for large complex systems. For more information\, please visit our website https://abcmc.iisc.ac.in/events/ \n  \nSpeaker: Dr. Sankaran Mahadevan \n  \nBiograpgy:  \nProfessor Sankaran Mahadevan has thirty-six years of research and teaching experience in reliability and risk methods\, uncertainty quantification\, model validation\, system health and risk management\, and optimization under uncertainty. His research has been extensively funded by NSF\, NASA\, FAA\, DOE\, DOD\, DOT\, NIST\, General Motors\, Chrysler\, Union Pacific\, American Railroad Association\, and Sandia\, Idaho\, Los Alamos and Oak Ridge national laboratories. His research contributions are documented in more than 700 publications\, including two textbooks on reliability methods and 350 journal papers. He is one of the world’s highest cited researchers in the field of uncertainty and risk analysis (Google Scholar h-index 90). He has directed 56 Ph.D. dissertations and 24 M. S. theses and has taught many industry and university short courses on the mathematics and computing of uncertainty and reliability analysis. Professor Mahadevan is a Fellow of AIAA\, Fellow of the Engineering Mechanics Institute (ASCE)\, and Fellow of Prognostics and Health Management Society (PHM). He is the winner of several prestigious awards including the Senior Distinguished Research Award from the International Association of Structural Safety and Reliability\, NASA Next Generation Design Tools award\, SAE Distinguished Probabilistic Methods Educator Award\, and best paper awards in several international conferences. He recently completed his service as President of the ASCE Engineering Mechanics Institute and Managing Editor of ASCE-ASME Journal of Risk and Uncertainty (Part B: Mechanical Engineering). He is currently Chair of the ASME VVUQ50 Committee on Advanced Manufacturing.
URL:https://aero.iisc.ac.in/event/two-day-short-course-on-mathematics-and-computing-of-risk-reliability-and-resilience-in-network-and-enterprise-systems/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/12/TwoDay.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20241001T153000
DTEND;TZID=Asia/Kolkata:20241001T163000
DTSTAMP:20260414T211302
CREATED:20241118T095302Z
LAST-MODIFIED:20241118T095302Z
UID:10000023-1727796600-1727800200@aero.iisc.ac.in
SUMMARY:Shape control and programmable morphing: applications to biological and bio-inspired motility
DESCRIPTION:In recent years\, we have studied morphing and shape control problems in the context of motility of biological systems and locomotion of robotic systems. Our aim is to distil lessons useful for the design of innovative and bio-inspired medical and devices. The tools used for this purpose include theoretical/computational mechanics of solids and fluids\, physical experimentation and manufacturing of prototypes\, and observations at the microscope in the case of unicellular swimmers. \nSome of the insights that have emerged from this research line are reviewed in this talk\, with special emphasis on unicellular swimmers\, both flagellates and ciliates\, and on attempts to produce bio-inspired artifacts mimicking their capabilities using active materials such as liquid crystal elastomers. As examples of applications\, we discuss fabrication and modelling of LCE-based fiber arrays realizing artificial active cilia carpets [1] and light-powered LCE-based medusoid swimmers [2]\, see Figure 1 below. \n  \nSpeaker: Prof. Antonio DeSimone \nBiography: Prof. Antonio DeSimone is a professor of Structural Mechanics at SISSA in Trieste and the BioRobotics Institute at Scuola Superiore Sant’Anna in Pisa. His research interests span a wide range of topics\, including the mechanics of materials\, micromagnetics\, systems biology\, and the calculus of variations. He has held numerous visiting research appointments\, including positions at the University of Minnesota\, Université Paris XIII\, the Joliot-Curie Chair at ESPCI Paris\, the Institute for Mathematics and its Applications in Minneapolis\, and the Isaac Newton Institute for Mathematical Sciences in Cambridge. In recognition of his contributions to the mathematical sciences\, he was awarded the Keith Medal in 2006.
URL:https://aero.iisc.ac.in/event/shape-control-and-programmable-morphing-applications-to-biological-and-bio-inspired-motility/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240910T153000
DTEND;TZID=Asia/Kolkata:20240910T163000
DTSTAMP:20260414T211302
CREATED:20241118T094224Z
LAST-MODIFIED:20241118T094224Z
UID:10000020-1725982200-1725985800@aero.iisc.ac.in
SUMMARY:Solutions for Reducing Severity in Aircraft Flat-Spin Recovery
DESCRIPTION:Aircraft spin is special category of stall and defined as an autorotation in a downward helical pattern with a higher yaw rate than roll and pitch rate. Among the various modes of aircraft spin\, flat-spin being the most ruthless form and characterized by a high angle of attack (𝛼) in the range of 65° to 90°. The flat spin is particularly dangerous since the efficiency of aerodynamic control surfaces is greatly diminished due to nearly perpendicular airflow. In this seminar\, I will talk about\, different flight dynamic and control-based solutions that I developed for recovery (1. Recovery Using Primary Control Surfaces\, 2. Recovery Using Optimally Deflected Deployable Fin\, 3. Strategic Thrust Vector Control Based Recovery\, 4. Vertical Thrust Based Recovery\, 5. Recovery Satisfying Aerodynamic and Load Factor Constraints\, 6. Recovery Using Model Predictive Control\, and 7. Decoupled Incremental Nonlinear Dynamic Inversion Control for Recovery) to reduce the fatality of the flat-spin in terms of excessive altitude loss regulating the survivability post aircraft recovery. Moreover\, an investigation is performed on how the wind and wind share impact the recovery profile. The flat-spin recovery profile is demonstrated on a mathematical model of F-18 high alpha research vehicle (HARV) to test the efficacy of the proposed methods. \nSpeaker: Dr. Salahudden \nBiography: Dr. Salahudden is currently working as an Assistant Professor at the Department of Aerospace Engineering (AE) at Punjab Engineering College\, Chandigarh\, India. Before this\, he was the Deputy Manager in Flight Controls Department at TATA Aerospace and Defence. Prior to that\, he worked as a Postdoctoral Fellow at Auburn University in the AE Department\, United States. He earned a Ph.D. in AE from the Indian Institute of Technology Kanpur (IITK)\, India\, in 2022. He received a M.Tech in AE from IIT Kanpur in 2018 and a B.Tech in AE from SRM University Chennai\, India in 2016. His research interests include the areas of flight mechanics\, aircraft dynamics\, aircraft design\, control law design for flight vehicles\, aircraft simulator design\, and autopilot design. He published numerous reputable journals and conferences based on his research. He is also serving as a reviewer for several reputed journals. He has received many academic and research awards\, such as Outstanding PhD Thesis Award\, Excellent Undergraduate Project Award\, and Outstanding Academic Performance Award.
URL:https://aero.iisc.ac.in/event/solutions-for-reducing-severity-in-aircraft-flat-spin-recovery/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240826T150000
DTEND;TZID=Asia/Kolkata:20240826T160000
DTSTAMP:20260414T211302
CREATED:20241118T084323Z
LAST-MODIFIED:20241118T084323Z
UID:10000019-1724684400-1724688000@aero.iisc.ac.in
SUMMARY:Guidance for Pursuit and Evasion
DESCRIPTION:Traditional pursuit-evasion engagements are concerned with a single pursuer chasing a single target. Current and future engagements may include more than two adversaries. In my talk I will present some new guidance concepts we developed for: 1-on-1\, N-on-1\, 1-on-N\, and N-on-M engagements. Special emphasis will be given to the underlying geometrical rules for guidance as well as to the presentation and analysis of some interesting cooperative guidance schemes. \nSpeaker: Prof. Tal Shima \nBiography: Tal Shima received his B.Sc.\, MA\, and Ph.D. degrees\, all in Aerospace Engineering\, from the Technion – Israel Institute of Technology. He also received the MBA degree from the Tel-Aviv University. Since 2006 Dr. Shima is with the Department of Aerospace Engineering at the Technion where he currently holds the Lottie and Max Dresher Chair in Aerospace Performance and Propulsion. He recently finished his 4 years’ term as dean of the department. His current research interests are in the area of guidance of autonomous vehicles\, especially aerial ones\, operating individually or as a team. He is the author/co-author of more than 100 archival journal papers in these research areas.
URL:https://aero.iisc.ac.in/event/guidance-for-pursuit-and-evasion/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240823T160000
DTEND;TZID=Asia/Kolkata:20240823T170000
DTSTAMP:20260414T211302
CREATED:20240822T090144Z
LAST-MODIFIED:20240822T090919Z
UID:10000018-1724428800-1724432400@aero.iisc.ac.in
SUMMARY:Recent Advances in Infrared Optics: From Metalenses to Upconversion  Imaging
DESCRIPTION:Infrared imaging and spectroscopic sensing are strategic technologies with diverse applications in defense\, space\, industrial monitoring\, medical diagnosis and treatment. Advancements in infrared sensing technology over the years has relied on key developments in light sources\, detectors\, optical components and image processing techniques. However\, the high costs of infrared coherent light sources\, poor performance of cooled focal plane-arrays\, and use of exotic materials for building lenses\, filters\, polarizers etc. has been a deterrent in finding widespread use for this technology. There is an ongoing effort worldwide to realize high-performance yet\, practically relevant optical hardware solutions for infrared sensing and imaging. In this talk\, I will give an overview of this field drawing on personal pain points working on the applications. I will also discuss in detail three key developments in this area\, namely: (i) small foot-print metalenses for building lowcost infrared imaging systems\, (ii) high-performance\, resonant metasurfaces as wavelength selective filters for multispectral applications\, and (iii) up-conversion imaging as an alternative for direct infrared detection by converting infrared photons to the visible range for detection using high performance silicon sensors. \nSpeaker: Prof. Varun Raghunathan \nBiography: Varun Raghunathan is an Associate Professor at the ECE department\, Indian Institute of Science\, Bangalore\, India. His research group works broadly in the area of experimental optics with interest in nonlinear optics\, integrated nanophotonics\, biophotonics\, optical and quantum communications. He obtained his Ph.D. degree in electrical engineering from the University of California Los Angeles\, Los Angeles\, CA\, USA\, in 2008\, working on silicon photonics. From 2009 to 2012\, he was a Postdoctoral Scholar with the Department of Chemistry\, University of California Irvine\, Irvine\, CA\, USA\, working in the area of nonlinear optical microscopy. He was also Research Scientist with Agilent Research Laboratories\, Santa Clara\, CA\, USA from 2012 to 2016\, working in the areas of infrared micro-spectroscopy with applications of novel optical sensing techniques in digital pathology.
URL:https://aero.iisc.ac.in/event/recent-advances-in-infrared-optics-from-metalenses-to-upconversion-imaging/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:AE Seminar
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/AE-Seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240418T213000
DTEND;TZID=Asia/Kolkata:20240418T223000
DTSTAMP:20260414T211302
CREATED:20240418T112845Z
LAST-MODIFIED:20240803T053223Z
UID:10000005-1713475800-1713479400@aero.iisc.ac.in
SUMMARY:[PhD Colloquium] A class of vector fields for path following guidance
DESCRIPTION:With rapidly evolving application scenarios\, Unmanned Aerial Vehicles (UAVs) are often desired to autonomously follow predefined paths. Prospective path following guidance methods should cater to the dynamic capability of the UAV\, curvature variation along the path\, and provide accurate performance while utilizing\, preferably\, a computationally inexpensive guidance logic. This thesis presents a class of vector fields addressing a variety of path following guidance problems. \nThe first part of the thesis considers constant curvature paths\, namely\, straight lines and circular orbits. The key idea is to generate the commanded UAV course angle as a vector field based on the instantaneous UAV position. The vector field logic uses an arcsine shaping function based on the UAV position with respect to the desired path. A stability analysis guarantees asymptotic convergence of the UAV position error to zero. A detailed comparative study with a popular approach demonstrates that the proposed method significantly reduces the maximum curvature and the total control effort along the guided trajectory. Numerical simulation studies consider a second-order course hold autopilot\, first-order airspeed control and different UAV initial conditions to demonstrate the effectiveness of the proposed guidance method. \nThe second part of the thesis considers scenarios wherein the path exhibits variation in its curvature. First case considers an elliptic path following scenario\, and a course angle guidance command is proposed which encompasses path convergent and path tangential components. The path convergent term is deduced using an arcsine shaping function of the UAV position error with respect to the path\, while the tangential component is obtained using the slope information of the path. The second path following case considers paths described explicitly as y = f(x). Therein\, again the course angle guidance command comprises path-tracking and path-attracting elements. Subject to the proposed guidance methods\, asymptotically converging behaviour of the UAV position error is deduced using Lyapunov stability theory. Extensive simulation studies are carried out with several UAV initial positions for following elliptic\, sinusoidal\, and parabolic paths. \nNext\, the thesis introduces rectangular boundary surveillance guidance using Lamé curve paths. Geometric properties of the Lamé curve paths are analysed\, and an efficient Lamé curve path-based circumscription of a rectangular boundary is proposed. Considering a given UAV maximum turn rate\, a comparative analysis highlights that the proposed Lamé curve path offers significantly reduced path length in circumscribing a rectangular boundary as compared to widely used elliptic circumscription. Further\, a vector field guidance method is introduced to follow the Lamé curve path\, and its stability properties are established. Numerical simulations include sample scenarios with several UAV initial conditions and comparative studies with different rectangular dimensions. \nUsing an indoor motion capture facility and a quadrotor UAV platform\, the last part of the thesis presents experimental validation studies for the proposed guidance methods. Flight trials consider a variety of constant and variable curvature paths and demonstrate the effectiveness of the proposed guidance methods. \nOverall\, the proposed guidance methods present simple\, analytic\, and easily computable path-following logic that utilize only the UAV position information. Deterministic performance guarantees and extensive validation studies further add to the merit of the proposed guidance solutions. \n  \nSpeaker: Amit Shivam
URL:https://aero.iisc.ac.in/event/a-class-of-vector-fields-for-path-following-guidance/
LOCATION:Auditorium (AE 005)\, Department of Aerospace Engineering
CATEGORIES:Thesis Colloquium / Defence
ATTACH;FMTTYPE=image/jpeg:https://aero.iisc.ac.in/wp-content/uploads/2024/04/Thesis-Colloquium-Defence.jpg
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