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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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TZOFFSETFROM:+0530
TZOFFSETTO:+0530
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240910T153000
DTEND;TZID=Asia/Kolkata:20240910T163000
DTSTAMP:20260728T202054
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
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240826T150000
DTEND;TZID=Asia/Kolkata:20240826T160000
DTSTAMP:20260728T202054
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:20260728T202054
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:20260728T202054
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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