Conference Papers

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Author: search.filters.author.Koorata, P.K.

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    NUMERICAL INVESTIGATION ON THE EFFECTS OF INHOMOGENEOUS GAS DIFFUSION LAYER AND IMPACT OF INTERFACIAL CONTACT RESISTANCE ON PERFORMANCE OF POLYMER ELECTROLYTE FUEL CELLS
    (International Association for Hydrogen Energy, IAHE, 2022) Shinde, U.; Padavu, P.; Koorata, P.K.
    A three-dimensional single-channel is modeled numerically to simulate homogeneous and inhomogeneous gas diffusion layer (GDL). The effect of interfacial contact resistance (ICR) between flow field ribs and GDL is also studied. The present study involves GDL being considered as a single component (homogeneous) in one case while in another case, GDL being considered with varying porosities to depict the inhomogeneity. The inhomogeneity in GDL is assumed to occur due to localized deformation induced due to non-uniform contact pressure. The study reveals increased availability of reactants at higher current loads in the case where ICR is assumed negligible. This study explains how the presence and absence of ICR impact reaction concentrations, water concentration, current density and polarization curve of polymer electrolyte fuel cells. It is observed in polarization curve that the presence of ICR has effect both in ohmic and mass transport region. This work involves considering 4 cases viz: homogeneous GDL, inhomogeneous GDL, homogeneous GDL with ICR and inhomogeneous GDL with ICR. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
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    Development of Fast Charging Control Algorithm for Electric Vehicles
    (Institute of Electrical and Electronics Engineers Inc., 2022) Yadav, A.; Koorata, P.K.; Dastagiri Reddy, B.D.
    The rapid market integration of electric vehicles has resulted in an increase in the interest of fast charging technology. One of the major concerns associated with fast charging is safety of the operation. Fast charging involves effective communication between DC charger and battery management system through the charging control algorithm embedded in the vehicle controller unit. The development of such control strategy requires interdisciplinary cooperation between different participants. A lack of system understanding can lead to safety hazards. Here in this paper, we have developed a charging control strategy for CHAdeMO DC charger using model-based development which is a better method than conventional embedded C coding and its working is shown in a starter model of DC charger in STATEFLOW. © 2022 IEEE.
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    Geometrical pole shape optimization of an outer rotor synchronous reluctance motor for output torque enhancement
    (Institute of Electrical and Electronics Engineers Inc., 2024) Chauhan, V.K.S.; Koorata, P.K.
    This article explores optimizing design for Permanent magnet (PM) free outer rotor synchronous reluctance machines to be used as in-wheel motors for electric vehicles. The primary objective is enhancing torque output by systematically analyzing various rotor pole shapes and parameters such as pole depth, arc angles, rib thickness, channel width, and fillet radii. These parameters were studied on four different types of pole shapes. Using ANSYS Maxwell software, the analysis is performed on an outer rotor motor with a diameter of 190 mm and a rated speed of 1200 RPM. The results indicate that outer rotor machines with configurations such as an inner arc angle of 9 degrees and an outer arc angle of 24 degrees exhibit optimal torque output for pole shape 1. Moreover, the study reveals that an increase in pole depth (SB) corresponds to an increase in torque output, while rib thickness reduces torque output. Additionally, the research explores the impact of fillet radii on torque performance. This study provides the effects of essential features of critical design parameters on reluctance torque for maximizing average torque in outer rotor motors utilized in EV applications. © 2024 IEEE.
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    Investigation on the Influence of Soft Tissues in Knee Joint on Load Transfer Mechanism during the Gait Cycle
    (American Institute of Physics, 2024) Raju, V.; Koorata, P.K.
    Soft tissues keep the human knee joint stable and serve an essential function in limiting motion during daily activities.The goal of this work is to investigate the influence of knee components during a person subjected to walking. A 3D finite element model of a knee joint used for the analysis. The knee kinetics (forces and rotation) during the stance phase of a gait in all degrees of freedom are incorporated into the model. The contact pressure, effective Lagrange strain, maximum shear stress, effective stress and total displacement generated on all the soft tissues are compared. The meniscus shows a more excellent value in all areas concerning other tissues, and for stress values, it is 4 to 5 times greater. The result also indicates that the contact pressure of the tibial cartilage is higher than the femur cartilage throughout the cycle. However, the effective Lagrange strain of femur cartilage is higher than tibial cartilage during the initial phase of the cycle and later declined. These values might help develop comprehensive computational tools to help us better understand the knee injury and disease causes. © 2024 American Institute of Physics Inc.. All rights reserved.