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TZID:Asia/Kolkata
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DTSTART:20240101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240731T150000
DTEND;TZID=Asia/Kolkata:20240731T160000
DTSTAMP:20260620T094839
CREATED:20240731T054804Z
LAST-MODIFIED:20240822T084630Z
UID:10000012-1722438000-1722441600@aero.iisc.ac.in
SUMMARY:[MTech(Res) Colloquium] Deformation-based Topological Lattices and their Edge States
DESCRIPTION:Topological elastic metamaterials (TEMs) represent a novel class of elastic materials known for their unique ability to localize vibration energy at boundaries\, maintaining robustness against system disorders. These unconventional properties make TEMs highly attractive for applications in vibration isolation\, energy harvesting\, mechanical sensing\, and waveguiding.\n\n\nSpring-mass models are fundamental in designing TEMs\, capturing essential physics due to their structure of periodically repeating unit cells with lumped masses. The elastic coupling of these unit cells gives rise to unique wave propagation properties within the bulk material. Traditionally\, TEMs have been analyzed using mass displacements as degrees of freedom. However\, recent discoveries have shown that analyzing these models through the lens of spring deformations as degrees of freedom opens up new design possibilities for TEMs.\n\n\nIn this study\, we generalize the deformation framework in one dimension (1D). We introduce a novel 1D TEM that employs spinners with alternating moments of inertia coupled to their nearest neighbors through various types of spring connections. These connections result in different spring deformations\, thereby extending the deformation framework. Notably\, different localization profiles of boundary states emerge at opposite ends of the finite model\, explained by hidden chiral symmetry in the deformation framework. The results are validated experimentally using Laser Doppler Vibrometry. We further extend the deformation framework to two dimensions (2D) using a quasi-1D approach\, demonstrating the robustness of boundary waves against disorder.\n\n\nWe then explore the mathematical foundations of the deformation framework for a general 1D lattice\, revealing an underlying rank deficiency in the local stiffness matrices of spring-mass models. This leads to a unique factorization of the global stiffness matrix\, allowing the model to be represented in the deformation framework as an isospectral partner. We illustrate the utility of this approach with examples of spring-mass models for bars and beams\, generating a family of isospectral partners exhibiting disorder and boundary states.\n\n\nOur study introduces a non-standard approach to expressing the dynamics of spring-mass models of TEMs\, unlocking numerous research opportunities to construct periodic and aperiodic topological systems with a broader range of boundary conditions. Additionally\, the insights gained from this work can be extended to other classical domains\, such as acoustic\, photonic\, and electrical systems.\n  \n  \n\nSpeaker: UDBHAV VISHWAKARMA
URL:https://aero.iisc.ac.in/event/mtechres-colloquium-deformation-based-topological-lattices-and-their-edge-states/
LOCATION:STC Seminar Hall\, Dept. 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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240719T103000
DTEND;TZID=Asia/Kolkata:20240719T233000
DTSTAMP:20260620T094839
CREATED:20240719T061638Z
LAST-MODIFIED:20240803T061806Z
UID:10000016-1721385000-1721431800@aero.iisc.ac.in
SUMMARY:On mathematical analysis of biomembrane structures
DESCRIPTION:During the cellular processes\, membrane instabilities play a crucial role across the several domains of life. In many cases\, this is aided by evolutionary molecular complexes. For example\, the complex contains protein monomers that adhere to the cell membrane and polymerize into thin filaments\, which proceed to form a helical constricting bundle\, eventually leading to the cleavage of the neck during cell division; the exact mechanism by which the helical filament induces curvature in the membrane is poorly understood. Recently\, we explored the mechanics of membrane and filament coupling through a continuum model for both structures and presented computational strategies to solve the highly nonlinear model. In an ongoing work\, we model a similar phenomenon associated with particles and use linear stability analysis to predict the onset of certain instabilities in the case when proteins are modeled as embedded particles. A part of this research is under current investigation using both numerical techniques as well as tools of local nonlinear analysis of bifurcating branches. \nSpeaker: Prof. Basant Lal Sharma \nBiography: Prof. Basant Lal Sharma received a Bachelor of Technology in Mechanical Engineering from the Indian Institute of Technology Bombay\, Powai\, Mumbai\, India\, in 1999. In 2004\, he received a Ph.D. in Mechanics (P. Rosakis) from Cornell University\, Ithaca\, NY\, USA. After post-doctoral positions at Cornell University (S.H. Strogatz) and École Polytechnique\, Palaiseau\, Paris\, France (L. Truskinovsky)\, he joined the Department of Mechanical Engineering\, Indian Institute of Technology Kanpur in January 2007 as a Faculty member.
URL:https://aero.iisc.ac.in/event/on-mathematical-analysis-of-biomembrane-structures/
LOCATION:STC Seminar Hall\, Dept. 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:20240716T160000
DTEND;TZID=Asia/Kolkata:20240716T170000
DTSTAMP:20260620T094839
CREATED:20240716T061914Z
LAST-MODIFIED:20240803T062047Z
UID:10000017-1721145600-1721149200@aero.iisc.ac.in
SUMMARY:[PhD Defense] Bearings-Only Quadrotor Guidance in Gap Traversal Scenarios
DESCRIPTION:In autonomous missions\, quadrotors are often required to safely fly through gaps or openings. Designing traversal guidance strategies becomes crucial in such scenarios\, especially when the quadrotor relies on the information obtained through onboard sensors. Lightweight and passive vision-based sensors can readily provide bearing information of the gaps using image features. This thesis addresses the quadrotor guidance problem of traversing gaps using only the relative bearing information. Specifically\, the work considers three scenarios: planar flight through gaps\, window traversal\, and moving gap traversal for lane transition in air corridors. \nThe first part of the thesis presents a planar gap traversal guidance law using bearings-only information. The main contribution in this part is a novel guidance method governing quadrotor heading direction using bearing information of the gap opening. The proposed heading direction is designed using an elliptic shaping angle derived from the angular bisector orientation of the gap-bearing angles. The stability of the resulting closed-loop kinematics is ascertained using Lyapunov’s direct method. Additionally\, a phase plane analysis is carried out to visualize the safe traversal characteristics of the proposed method considering all possible initial conditions around the gap. Combined with a tracking controller\, the proposed guidance strategy is applied to a six-degree-of-freedom (6-DOF) quadrotor model\, ensuring convergence towards the prescribed trajectory. The effectiveness of the proposed guidance method is validated with numerical simulations considering several initial conditions\, noisy bearing measurements\, and dynamic vehicle constraints. \nMoving beyond planar scenarios\, a three-dimensional window traversal problem is considered in the next part of the thesis and a guidance solution is proposed using bearing information of window extremities. The guidance logic governs the commanded flight path angle and heading angle of the vehicle. Again\, these commands comprise an angular bisector component with a shaping angle\, facilitating traversal along a direction normal to the window plane and passing through the centroid. A detailed stability analysis ascertains the convergence of vehicle trajectories to the desired traversal path. Simulation studies consider a 6-DOF quadrotor model\, dynamic attitude constraints\, and noise in bearing information. The robustness of the proposed method is demonstrated through a Monte-Carlo simulation study\, considering various initial conditions and noisy measurements. \nNext\, a new lane transition guidance method for a quadrotor flying in an air corridor system is introduced. Utilizing the bearing information of the neighboring vehicles\, the guidance method directs the quadrotor for a safe transition between two lanes. Comprising three sequential guidance phases\, the method includes discerning guidance for determining neighboring vehicle velocity\, longitudinal guidance to identify suitable gaps in the destination lane\, and transit guidance to maneuver the quadrotor into the desired gap. A detailed analysis deduces\, in closed-form\, the time duration for each of the three guidance phases. Additionally\, local asymptotic stability is ascertained for the proposed guidance phases. Simulation results and Monte-Carlo studies demonstrate the proposed method’s feasibility\, effectiveness\, and robustness for safe autonomous lane transition. \nOverall\, the proposed guidance methods present simple\, easily computable and closed-form analytic guidance inputs using only the passive bearing information. Further\, deterministic performance guarantees provide a sound theoretical foundation for the novel guidance solutions. The thesis also includes representative experimental studies using an indoor motion capture system and Crazyflie quadrotor platform. \n  \n  \nSpeaker: Midhun E K
URL:https://aero.iisc.ac.in/event/phd-defense-bearings-only-quadrotor-guidance-in-gap-traversal-scenarios/
LOCATION:STC Seminar Hall\, Dept. 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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240705T163000
DTEND;TZID=Asia/Kolkata:20240705T173000
DTSTAMP:20260620T094839
CREATED:20240705T061014Z
LAST-MODIFIED:20240803T061218Z
UID:10000014-1720197000-1720200600@aero.iisc.ac.in
SUMMARY:[PhD Defense] Wave Propagation in Bio-Inspired Inhomogeneous waveguides for Impact  Mitigation Applications
DESCRIPTION:Decades of research aim to shield structures and people from impact and  shock\, mitigating damage and traumatic brain injuries. The development  of novel structures to absorb energy and reduce stress waves in  structures is indispensable. This thesis derives inspiration from the  biological structure of the woodpecker beak. The woodpecker pecking  generates very high amplitude impact loads causing stress waves to  propagate in its inhomogeneous beak structure\, without sustaining any  brain injury. The main aim of this thesis is to mimic such inhomogeneous  structures in the critical mechanical systems that require impact  mitigation. This dissertation focuses on comprehensive investigation of  computational and experimental wave propagation analysis in such  bio-inspired inhomogeneous structures\, which are often periodic\,  symmetric or anti-symmetric about the midplane\, while exhibiting both  the elastic and viscoelastic material behaviour. Importantly\, the goal  of these new bio-inspired designs is to control the wave propagation in  terms of increased attenuation\, reduction of group speeds and increase  in dispersion. \nFirstly\, the superconvergent finite elements (FE) for longitudinal and  flexural wave propagation analysis in the symmetrical sinusoidally  corrugated bio-inspired structures considering both elastic and  viscoelastic material models are developed\, whose accuracy is validated  using Abaqus. In addition to the wave propagation studies\, static and  free vibration analyses are also carried out in such structures. Next\,  the governing differential equations and the superconvergent FE are  derived for the wave propagation analysis in the shear-deformable  waveguides with anti-symmetric sinusoidal corrugations that introduce  coupling between the wave modes\, and it is validated using the  conventional FE. The study resulted in the development of the  methodology to easily manipulate wave propagation characteristics. Thus\,  a few optimised waveguide configurations that can reduce both group  speeds and wave amplitudes are presented. \nDue to the advantage of modeling viscoelasticity in the frequency  domain\, the frequency domain finite elements based on the spectral FE  are developed for both elastic and viscoelastic structures. Exploiting  the periodicity of the bio-inspired structures\, the dispersion plots are  obtained using the Floquet-Bloch theorem and the transfer matrix method.  The spectral FE and Bloch theorem-eigenvector methods are then used to  obtain the time-history responses in the semi-infinite as well as finite  structures. For dynamic and wave propagation analysis of viscoelastic  structures in the time domain\, a new direct time integration scheme is  also proposed. The stability analysis of the proposed scheme is carried  out using the spectral technique as well as the von Neumann stability  criteria. The responses obtained using the proposed time integration  scheme for various structures are validated with a commercial finite  element code. \nBased on the conducted research\, facesheets for honeycomb sandwich  structures as a practical application for blast wave mitigation are  developed. The suture structures in the facesheets are obtained with the  multi-objective structural optimization method using genetic algorithm  (NSGA-II)\, wherein the developed viscoelastic FE formulation is used.  The performance of this optimized suture-based face sheet is  experimentally tested in a vertical shock tube to validate the results  obtained using Abaqus.\nIn summary\, this thesis offers a multidisciplinary approach in  investigating and understanding wave propagation in the bio-inspired  inhomogeneous structures and its relevance to impact mitigation. \n  \n  \nSpeaker: Manish Suresh Raut
URL:https://aero.iisc.ac.in/event/phd-defense-wave-propagation-in-bio-inspired-inhomogeneous-waveguides-for-impact-mitigation-applications/
LOCATION:STC Seminar Hall\, Dept. 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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240627T153000
DTEND;TZID=Asia/Kolkata:20240627T163000
DTSTAMP:20260620T094839
CREATED:20240627T053941Z
LAST-MODIFIED:20240803T060152Z
UID:10000010-1719502200-1719505800@aero.iisc.ac.in
SUMMARY:[MTech(Res) Colloquium] Sub-mesoscale modeling of woven fabrics using VAM-based geometrically-exact beam model
DESCRIPTION:In this work\, a sub-mesoscale model of a woven fabric is developed using finite element methods. The yarns are modeled as beam elements that move freely in space and undergo large deformations and rotations. The geometrically-exact beam theory (GEBT) used to model composite beams of arbitrary cross sections is considered to model the yarns. The variational asymptotic method (VAM) offers the advantage of modeling beams of arbitrary cross sections. A surface-to-surface contact model is developed\, considering that the contact occurs at a point on the surface. The robustness of the contact model is tested by designing a patch test. The mesoscale model is validated using experimental results of biaxial tests performed on a plain glass weave woven fabric. The biaxial simulation is performed by varying the number of yarns in the mesoscale model to study the behavior of the model and demonstrate a representative volume element (RVE). The yarns are made up of fibers twisted together. An isotropic model is an approximation that works well on the mesoscale\, but a more general model is needed to include fiber-level information. Most microscale models use technologically expensive micro-CT scans. There are powerful homogenization techniques\, such as variational asymptotic homogenization (VAH)\, that can be leveraged to develop homogenized properties of the yarn by including fiber-level information. The use of VAH includes more physics into the model with minimal effort. A novel alternative model to a woven fabric is developed using VAM to include microscale information. The tools like cross-sectional analysis\, GEBT\, and VAH are used to study the behavior of woven fabrics with different coatings. The model can be extended by introducing friction between yarns in the contact. Further\, the uncertainty in the input parameters can be quantified by propagating the uncertainty through the system using uncertainty quantification (UQ) techniques. \n  \n\nSpeaker: R ADHITHYA
URL:https://aero.iisc.ac.in/event/mtechres-colloquium-sub-mesoscale-modeling-of-woven-fabrics-using-vam-based-geometrically-exact-beam-model/
LOCATION:STC Seminar Hall\, Dept. 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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240614T160000
DTEND;TZID=Asia/Kolkata:20240614T170000
DTSTAMP:20260620T094839
CREATED:20240614T061338Z
LAST-MODIFIED:20240803T061531Z
UID:10000015-1718380800-1718384400@aero.iisc.ac.in
SUMMARY:Design and characterization of periodic scatterers for noise insulation
DESCRIPTION:The array of periodic scatterers is known as sonic crystal at present and sonic crystal is the most cost-effective solution for a “noise barrier” because of its acoustic attenuation due to size\, geometry\, and periodic arrangement of scatterers. Porous materials that are commonly used for sound absorption have poor sound insulation capability. In this work\, rigid scatterers are installed periodically inside porous materials to improve their transmission loss (TL) with the Bragg diffraction. The Delany-Bazley impedance model is used to model the porous material and the transfer matrix method is adopted to calculate the TL of the mixed structure in a duct. Simulation results with a different number of scatterers and porous materials with different airflow resistivity show that the TL of porous materials can be increased significantly with periodically arranged scatterers. The decoupled analysis reveals that the TL of the mixed structure is larger than the sum of the TL of individual components in most frequency bands\, except that around the first Bragg resonance frequency. Afterwards\, the insertion loss (IL) of two types of finite size structures constructed by installing two parallel porous sheets within rows of periodic scatterers is investigated in free field. Next\, the free field insertion loss (IL) and echo reduction (ER) are calculated for finite size periodic scatterers via time domain simulations in a room environment where the walls of the room are acoustically reflective. A spectrally dense short pulse is used as a sound source and the time domain pulse separation technique is devised to calculate the IL and ER of finite size periodic scatterers. The key discovery of the research is that the calculated IL and ER of periodic cylindrical scatterers in a room environment agree to results obtained from the free field simulations which are also imitable experimentally. Next\, the experiments are conducted in a room environment with periodic cylindrical scatterers. A loudspeaker is used as a sound source. The signal synthesis technique is demonstrated to generate the desired short pulse from a loudspeaker for measurement in given environment followed by measurements which agree to simulation results. \n  \nSpeaker: Dr. Dibya Prakash Jena \nBiography: Dr. Dibya Prakash Jena is an expert in artificial metamaterials\, condition monitoring\, and acoustics\, vibration and noise control having wide experience in industry and academia. He has been awarded the DIN Young Visiting Fellowship 2022 and the Honorary Research Fellow of the University of Technology Sydney. He has over 32 journal publications\, 4 patents\, 2 book chapters and 12 conference publications.
URL:https://aero.iisc.ac.in/event/design-and-characterization-of-periodic-scatterers-for-noise-insulation/
LOCATION:STC Seminar Hall\, Dept. 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:20240313T073000
DTEND;TZID=Asia/Kolkata:20240313T203000
DTSTAMP:20260620T094839
CREATED:20240312T225849Z
LAST-MODIFIED:20240803T053029Z
UID:10000003-1710315000-1710361800@aero.iisc.ac.in
SUMMARY:[PhD Colloquium] Asymptotic Modelling of Carbon Nanotube (CNT) and CNT-reinforced composite structures using strain gradient formulations
DESCRIPTION:Carbon nanotubes (CNTs) have garnered attention for their remarkable mechanical\, thermal\, and electrical properties\, making them valuable in various applications. CNTs are particularly advantageous in aerospace structures as reinforcements in polymer matrix composites\, enhancing structural strength while reducing weight. Furthermore\, they offer the potential for multifunctionality\, integrating structural\, thermal\, and electrical functionalities within components like wings. However\, accurately modelling CNT behaviour poses challenges\, especially considering their application in larger-scale aerospace structures. While accurate\, molecular dynamics and molecular structural mechanics are computationally intensive and limited in length scale. In this context\, the present research proposes reduced-order continuum structural models using the Variational Asymptotic Method (VAM) to study CNT and its composite structures while incorporating length scale effects using strain-gradient formulations. \nUsing VAM\, single-walled CNTs (SWCNTs) were first analysed by considering them as straight\, hollow\, circular tubes in a local continuum framework. This tube model accounts for the geometrically nonlinear behaviour of standalone CNT when subjected to bending and buckling loads. Cross-sectional ovalisation leading to nonlinear bending and buckling behaviour has been studied. Combined loading cases of bending and compression and torsion and compression and bending and torsion have been examined. The study aims to provide insights into the 3-D nonlinear deformation behaviour of SWCNTs\, offering a more efficient approach for evaluating CNTs in aerospace composite applications. \nIn the next step\, recognising the significance of the structure’s small size (such as used in MEMS\, NEMS\, and sensors)\, the non-classical theories\, such as the Modified Strain Gradient Theory\, which account for the size effect in the material\, have been employed to develop a pioneering beam and plate models tailored for CNT-reinforced composite structures. Emphasising the critical nature of size effects\, characterised by length scale parameters\, this study delves into the nuances of the length scale effects in nanoscale structures. To develop the asymptotically-correct strain-gradient beam model\, a prismatic beam with a rectangular cross section has been considered to derive zeroth-order and subsequent higher-order models while capturing the strain-gradient effects. Notably\, this work is the first application of non-classical theories in developing VAM-based beam models. Different orders for length scale parameters have been considered\, and the validity of each choice is scrutinised\, followed by guidance on the appropriate choice of the length scale parameters. \nFollowing the development of the strain-gradient beam model\, a modified strain gradient theory-based plate model has also been developed using VAM\, which is again a first-of-its-kind work in the context of VAM and reduced-order structural models. Using the variational methods\, fourth-order ordinary differential equations were obtained for the non-classical case\, and similarly\, an additional set of boundary conditions (non-classical) were also derived. The warping solutions and the plate stiffnesses are obtained by solving these governing differential equations and boundary conditions. It was noted that the material length scale parameters appear only in the bending and twist stiffness terms. Further\, the classical results can be derived by setting the material length scale parameters as zero. Zeroth- and first-order approximations have been derived\, followed by detailed validation of the results with literature for bending and buckling load cases. Parametric studies involving variations in thickness and plate width have been conducted to assess their influence on mechanical behaviour. The developed plate model is then applied to CNT-reinforced composites\, and their bending and buckling studies have been carried out. The parametric studies have also considered evaluating all influencing parameters like CNT volume fraction\, material length scale parameter\, plate thickness and width. \n  \nSpeaker: Renuka Sahu
URL:https://aero.iisc.ac.in/event/asymptotic-modelling-of-carbon-nanotube-cnt-and-cnt-reinforced-composite-structures-using-strain-gradient-formulations/
LOCATION:STC Seminar Hall\, Dept. 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
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Kolkata:20240304T200000
DTEND;TZID=Asia/Kolkata:20240304T213000
DTSTAMP:20260620T094839
CREATED:20240324T084614Z
LAST-MODIFIED:20240802T165719Z
UID:10000002-1709582400-1709587800@aero.iisc.ac.in
SUMMARY:Nonequilibrium reacting flows: First principles based modeling for chemical kinetics and hydrodynamics
DESCRIPTION:Predicting state of the gas hitting vehicles flying at hypersonic speeds (Mach ~5) is challenging and is an exciting area of research. Hypersonic flows create shock waves\, which compress and heat the surrounding gas to high-temperatures\, nearly thousands of Kelvins. At these high temperatures\, air molecules (nitrogen and oxygen) dissociate into atomic species. Predicting the extent of dissociation and recombination of atomic species is important since the state of the gas near the vehicle surface determines heating rates and gas-surface chemistry that damages the heat shield. Since experiments in ground test facilities do not mimic such extreme flight conditions\, numerical simulation plays an important role. Predictive numerical simulations require accurate reaction chemistry models. Computational models developed thus far range from simple empirical models fit to limited experimental data to models with millions of input parameters that track individual quantized energy state transitions. The level of model fidelity required for accurate engineering analysis remains an open question of active research. Models coupling internal energy and dissociation chemistry tend to be developed at either the kinetic scale or the continuum scale. In this work\, we develop new nonequilibrium models for shock heated flows that are analytically consistent between kinetic and continuum scales and are based on recent ab-initio data\, applicable to large-scale CFD and direct simulation Monte Catlo (DSMC) simulations. \nNonequilibrium Hydrodynamics: The Navier-Stokes equations\, typically employed even at strong non-equilibrium conditions\, wherein thermodynamic fluxes such as stresses and heat flux vector are based on linear irreversible thermodynamics\, not be accurate in multiscale and multiphysics scenarios encountered in hypersonic flows. Similarly\, the Navier-Stokes equations are known to breakdown in rarefied (low density) gas flows. Therefore\, a new formalism is proposed to circumvent these issues\, which can also benefit\, hybrid methods that can combine continuum description using the Navier-Stokes equations and microscopic description\, necessary for efficient high-fidelity numerical simulations. Other wide range of physics problems such as nano-scale flows\, plasma physics modeling\, and general complex gas flows can also benefit from the proposed new non-equilibrium hydrodynamic formalism. \n  \nSpeaker: Dr. Narendra Singh \nBiography: Dr. Narendra Singh graduated with a PhD (and MS) in Aerospace Engineering (with minor in Mathematics and Chemistry) from University of Minnesota. Narendra obtained his undergraduate degree (with Honors) in MechE from IIT Bombay. In his doctoral thesis\, Narendra developed chemical kinetics models for DSMC and CFD using first principles-based approach. In addition\, Narendra (along with Prof.Agrawal) has developed higher order equations for rarefied and strong nonequilibrium flows\, known as O-13 and O-Burnett equations\, where O ‘refers’ to Onsager due to the consistency of equations with Onsager’s reciprocity principle. Narendra Singh did his 2 years postdoc in MechE at Stanford\, where his research spanned particle-laden flows\, carbon sequestration\, and ultrafast chemistry at SLAC. Currently\, he is a postdoc research associate at Center for Hypersonic\, UIUC\, and developing reduced order models for chemical kinetics. \n 
URL:https://aero.iisc.ac.in/event/nonequilibrium-reacting-flows-first-principles-based-modeling-for-chemical-kinetics-and-hydrodynamics/
LOCATION:STC Seminar Hall\, Dept. 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:20240205T140000
DTEND;TZID=Asia/Kolkata:20240205T150000
DTSTAMP:20260620T094839
CREATED:20240324T082740Z
LAST-MODIFIED:20240803T052011Z
UID:10000001-1707141600-1707145200@aero.iisc.ac.in
SUMMARY:Innovations in Aerospace Systems – Current Research (including Artificial Intelligence) and Future Challenges
DESCRIPTION:Aircraft and spacecraft are highly complex systems\, comprising various subsystems such as flight control\, propulsion\, and power. These subsystems feature Multiple Input & Multiple Output (MIMO) configurations and exhibit highly nonlinear characteristics. Over recent years\, there has been a growing demand for aerospace systems with improved performance\, fault tolerance\, and enhanced autonomous capabilities. This presentation explores how fault diagnosis\, prognosis and artificial intelligence can address these requirements. It delves into model-based\, data-driven (artificial intelligence)\, and hybrid approaches\, which have been proposed for fault diagnosis and prognosis. Furthermore\, the author has proposed novel methods to meet these evolving demands. These innovative techniques\, including the Covariance-based adaptive unscented Kalman filter (CAUKF)\, Binary grid covariance adaptive Kalman filter (GAUKF)\, Reinforced Unscented Kalman Filter (an integration of UKF and Reinforcement Learning techniques)\, and Growing Neural Networks (GNN)\, hold promise for aerospace system enhancement. The presentation will feature case studies illustrating the application of these methods in spacecraft attitude and orbit control systems\, as well as aircraft engines. By examining the latest advancements and methodologies\, attendees will gain insights into the pivotal role these techniques play in enhancing aerospace system reliability and efficiency\, ultimately addressing current research challenges and shaping the trajectory of future aerospace systems. \n  \nSpeaker: Prof. Krishna Dev Kumar \nBiography: Dr. Krishna D. Kumar is a Professor of Aerospace Engineering and Director of Artificial Intelligence for Aerospace Systems (AIAS) Laboratory at Toronto Metropolitan University\, Canada. Additionally\, he is the Founder and President of iSAC Systems Inc\,  a leader inArtificial Intelligence (AI)\, Internet-of-Things (IoT)\, and Smart Systems since 2010. Prof. Kumar has made outstanding contributions with major impact in the areas of spacecraft dynamics and control\, fault diagnosis and prognosis\, artificial intelligence\, and predictive analytics with over 250 publications including 5 books\, 14 intellectual properties\, and four patents. His AI and IoT products have been deployed across diverse industries\, including aerospace\, transportation\, and waste management. His illustrious career boasts several remarkable achievements\, including the development of AI-powered predictive analytics for the NASA Kepler Spacecraft and Aircraft Engines\, the world’s first 100-gram miniature satellite\, and the world’s first miniature IoT monitoring systems for Bombardier Trains\, and Safran Aircraft Landing gears.  Prof. Kumar’s exemplary contributions to the field have been widely recognized with numerous national and international awards\, including the prestigious Canada Research Chair Award\, Ontario Early Researcher Award\, Associate Fellow of American Aeronautics and Astronautics\, Japan Society for the Promotion of Science Fellow\, Japan Science and Technology Agency Fellow\, Member of the International Academy of Astronautics in France\, the Sarwan Sahota Ryerson Distinguished Scholar Award\, and the Eminent Alumnus Award from Veer Surendra Sai University of Technology\, Sambalpur\, India. Furthermore\, Prof. Kumar is the Co-Editor of Acta Astronautica and Transactions of the Japan Society for Aeronautical and Space Sciences.
URL:https://aero.iisc.ac.in/event/innovations-in-aerospace-systems-current-research-including-artificial-intelligence-and-future-challenges/
LOCATION:STC Seminar Hall\, Dept. 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
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