Abstract : A reasonable knowledge about the response of nonlinear offshore dynamical systems under environmental loads is necessary but challenging. This is due to the coupling of internal forces along with external excitations. In this mini symposium, mathematical model of nonlinear offshore systems will be considered with the intention of keeping the response close to the desired one. This can be achieved using sub-optimal control mechanism derived from nonlinear quadratic regulator theory and also its associated data can be visualized via ensemble statistical sense.
[01637] Robust control design for an autonomous underwater vehicle with uncertain dynamics
Format : Online Talk on Zoom
Author(s) :
Antony Crispin Sweety Charles Selvaraj (Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore)
Abstract : In this talk, we consider the robust control problem for autonomous underwater vehicles in the presence of nonlinearities and uncertainties. The aim is to obtain a robust controller in order to maneuver to any given point and track a moving target in the presence of parametric uncertainty and external disturbances. Specifically, the proposed state feedback robust controller guarantees the closed-loop system stability in the sense of the Lyapunov stability theory. Finally, simulation results are provided to verify the effectiveness of the control design.
[01719] Particle swarm optimization based robust controller for autonomous underwater vehicle
Abstract : The purpose of this work is to design a Particle Swarm Optimization (PSO) based controller in a systematic way to get the superior performance and robustness of the considered autonomous underwater vehicle model. Further, simulation results demonstrated the effectiveness of the proposed controller. The developed controller provides faster convergence to the change of parameters as compared to the conventional state feedback controller, for the stabilization of the closed-loop systems with external disturbances.
[01959] Applications of applied mathematics towards dynamic control of multi-dimensional structures
Format : Online Talk on Zoom
Author(s) :
Payel Chaudhuri (IIT KHARAGPUR)
Abstract : This work addresses an evolutionary optimal dynamic inversion algorithm-based semi-active controller for vibration reduction. The proposed inverse control algorithm is established on robust mathematical conceptualization and is ideal with semi-active magnetorheological dampers. The optimum voltage estimated from the proposed controller aid in generating the required control force from the MR dampers to the structures under dynamic loading. The resilience of the proposed inverse control algorithm is evaluated employing various seismic time histories on a multi-dimensional structure.
[01807] Ship maneuvering in waves
Format : Talk at Waseda University
Author(s) :
Rameesha T V (Scientist B)
Krishnankutty P (Professor (Retired))
Abstract : Poor controllability of a surface ship is considered as a major cause for most of the marine accidents, which may result in loss of life and property. The present proposal is focused on the prediction of ship maneuvering in waves. Mathematical model for maneuvering prediction is modified for wave condition. The steering and turning characteristics of a container ship in still water and wave condition are compared experimentally and numerically.
01043 (2/4) : 3D @G605 [Chair: Dr.Alankrita Singh]
[01761] AuX (X = Cu, Ag) monolayers promising Thermoelectric materials
Format : Online Talk on Zoom
Author(s) :
Kulwinder Kaur (Mehr Chand Mahajan DAV College for Women, Chandigarh)
Abstract : Under the application of strain, the electronic and thermoelectric properties of AuX (X = Cu, Ag) monolayers are investigated using density functional theory with the help of Boltzmann transport equations. At 6% strain, ultralow lattice thermal conductivity is observed. The maximum value of ZT is 2.20 and 1.40 for unstrained case and enhances to 3.61 and 2.91 at 6% strain for AuCu and AuAg monolayers, respectively, which compare favorably to several promising thermoelectric materials.
[01770] One-Dimensional Hetero-Nanothread Fibres for high mechanical energy storage Applications
Abstract : Searching for high density energy materials is a key challenge for the engineering sciences. Recently discovered carbon nanothread bundles (CNB) exhibit higher mechanical strengths than carbon nanotube bundles. MD simulation and continuum elastic theory show that CNB exhibits a high mechanical energy storage density of up to 1.76 MJ kg−1. The results suggest CNB is an ideal candidate for fiber applications. We look at how mechanical behavior changes with heteroatom doping in the pristine state.
[01763] The Li-based quaternary Heusler compound LiYPdSn: A promising thermoelectric material
Format : Online Talk on Zoom
Author(s) :
Jaspal Singh Dhillon (Mata Sundri University Girls College)
Abstract : A newly discovered Li-based quaternary Heusler compound LiYPdSn is investigated which is the 18 Valence Electron Count (VEC) rule follower, non-magnetic, stabilized in FCC cubic structure of F-43m space group, possessing a melting point of 1700K. The Boltzmann transport equations and the Density Functional Theory is employed to investigate its dynamic stability, electronic band structure, thermodynamic response, motivating mechanical and elastic properties, thermodynamic response, which finally results in favorable thermoelectric performances and safe environmental opportunities.
[02187] Mathematical modeling and Environmental Impact of COVID 19 pandemic
Format : Online Talk on Zoom
Author(s) :
Satarupa Dey (Shyampur Siddheswari Mahavidyalaya)
Abstract : The corona virus disease was declared as a global pandemic on the year 2020 due to its rapid spread and complex impact on human health. By the end of the pandemic in 2021, there has been numerous impacts on environment. The prolonged lockdown enhanced the quality of air and water in urban areas on the other hand use of personal protective equipment and mask have increased plastic pollution in water bodies due to its improper disposal. In this study the positive as well as negative impact of corona virus pandemic on environment is discussed.
[01894] Highly Stable Lead-Free Magnetic Perovskite semiconductors
Format : Online Talk on Zoom
Author(s) :
Shakeel Ahmad Khandy (Zhejiang University)
Abstract : Lead Free Halide Perovskites play a key role in Solar cell, LED, nondestructive bioimaging, long-wave communications, and medical care applications as they emit in the broader regions of spectrum from near-infrared region to visible range. Cs2MoX6 (X=Cl,Br) as key members of the luminescent family, have been reported to emit light in ultraviolet and visible regions. Both these systems grow in cubic phase and are stable under thermal, mechanical and dynamical constraints of density functional theory. In addition, the ferromagnetic interactions of Mo with halide p-states create a total magnetic moment of 2 mB, thus enabling another degree of freedom to play with
[02416] CFD of impingement over a curved surface by equilaterally staggered jets
Format : Online Talk on Zoom
Author(s) :
Alankrita Singh (Indian Institute of Technology Roorkee)
Abstract : The equilateral staggered arrangement of jets constitutes of a central jet surrounded by four neighboring jets. The concave plate is uniformly heated at constant heat flux of 3 kW/m2. SIMPLE is incorporated for pressure velocity coupling.SST k-ω is used as the turbulence model. The solution is assumed to be converged when sum of the normalized
residuals drop to e-5 for momentum, continuity and turbulence equations and e-7 for energy equations. Similar to lampblack visualization results, the CFD results show stretching of flow along the corners of the concave target surface.
[02634] An application of the Fuzzy inference system to Seismic Damage Prediction
Format : Online Talk on Zoom
Author(s) :
Dr. Champakali Das (Nims University)
Dr. Narendra Kumar (Nims University)
Dr. Amit Kumar Singh (RBS Engineering College)
Abstract : A damage prediction form has been developed by using fuzzy logic techniques. An earthquake caused significant damage to any building. The results of damage prediction must be used as the basis for a disaster preparedness plan if loss of life and property is to be reduced. Fuzzy logic offers a more unified strategy for addressing earthquake damage prediction difficulties because of the interconnectedness of the key components and the ambiguity of the ideas at play.
01043 (4/4) : 4C @G605 [Chair: Dr Payel Chaudhuri]
[03120] The Li-based quaternary Heusler compound LiYPdSn: A promising thermoelectric material
Format : Online Talk on Zoom
Author(s) :
Jaspal Singh Dhillon (Mata Sundri University Girls College)
Abstract : A newly discovered Li-based quaternary Heusler compound LiYPdSn is investigated which is the 18 Valence Electron Count (VEC) rule follower, non-magnetic, stabilized in FCC cubic structure of F-43m space group, possessing a melting point of 1700K. The Boltzmann transport equations and the Density Functional Theory is employed to investigate its dynamic stability, electronic band structure, thermodynamic response, motivating mechanical and elastic properties, thermodynamic response, which finally results in favorable thermoelectric performances and safe environmental opportunities.
[03204] Structural, electronic, dynamical and thermoelectric performance of LaCoTiSn Heusler alloy
Format : Online Talk on Zoom
Author(s) :
Yuhit Gupta (GSSS Badbar, Department of School Education, Punjab, India )
Abstract : In the present report, the physical properties of LaCoTiSn have been investigated by employing density functional theory. The calculated electronic band structure revealed the half-metallic character and 100% spin-polarization ratio suggest the ferromagnetic nature of the alloy. The evaluated value of Poisson’s ratio ‘0.34’ revealed the metallic bonding. To examine lattice dynamical stability, the phonon frequencies have been computed for first time. To measure the efficiency, the figure of merit is achieved to be 0.35.
