Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Effect of Soil-Structure Interaction on the Seismic Response of Elevated Water Tank(Springer Science and Business Media Deutschland GmbH, 2022) Jogi, J.; Jayalekshmi, B.R.The elevated tanks are the most critical and strategic structures since the tank contains heavy fluid mass and is placed on a slender staging. The foundation transmits the loads from the superstructure to the subsoil, and the displacement of the soil influences the response of the structure. Therefore, it is important to study the seismic response of liquid storage tanks with the incorporation of soil-structure interaction (SSI). This study aims to find the importance of the effects of supporting soil medium in the response of the water tanks. An elevated intze water tank of capacity 7,00,000 L on frame type staging was modeled and analyzed by considering SSI in finite element software ANSYS. To incorporate the effect of SSI, rock, dense, stiff, and soft supporting soil strata were considered. The infinite extent of soil was modeled using viscous boundaries. The transient analysis was carried out for the 3D liquid tank models with different supporting soils using Kobe earthquake data. The base shear, base moment, and structural displacements were found with the variation of depth of fluid inside the tank for all the models. The results showed that the maximum base shear and the base moment were observed in a tank resting on hard soil for the completely filled condition of liquid. The displacements are higher in the case of tanks resting on soft soil. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Sloshing Response of Water Tanks Under Seismic Excitation(Springer Science and Business Media Deutschland GmbH, 2022) Jogi, J.; Jayalekshmi, B.R.Liquid storage tanks are the predominant structures and they have to be designed to withstand major earthquake loads. In the present study, an elevated intze water tank of capacity 700 m3 was considered and analyzed for seismic effects. Finite element modeling of the tank was made in ANSYS. A series of transient analyses was carried out for El Centro and Kobe earthquakes which are applied in the horizontal direction. The fluid inside the tank accelerates and causes additional hydrodynamic pressures on the tank. Past studies reveal that the convective hydrodynamic pressure is more than the impulsive hydrodynamic pressure. Time history plots were made to describe the sloshing phenomenon in the tank for various levels of the liquid. The sloshing displacements for the one-third level of the liquid were found to be maximum. The sloshing displacements in the horizontal direction are more than in the vertical direction. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Development of Pneumatic Soft Gripper for Effective Material Handling(Institute of Electrical and Electronics Engineers Inc., 2024) Naveen, S.; Panigrahi, S.; Vinit, A.; Sudar, I.H.; Thomas, M.J.Recent times have shown a drastic transition in robotics from rigid to soft mechanisms. The reason is that soft robots offer safer human-robot interactions, reduce weight and also offer strong environmental adaptability. However, the inherent characteristics of soft materials to exhibit multiple degrees of freedom (DoF) make it challenging to control their movements. Therefore, this paper presents the development of a soft gripper with simple architecture to effectively and economically manipulate delicate objects. The gripper constructed using silicon rubber has an air cavity to actuate its opening and closing pneumatically. This paper presents the different stages of its construction and demonstrates its application on a 4 DoF robotic arm for handling delicate objects. A simulation study of the structural parameters of the proposed soft gripper is also carried out using ANSYS finite element software. The preliminary results show the superior adaptability of the soft gripper in handling objects of various shapes and sizes. The proposed system can find application in food, biomedical and electronic industries. © 2024 IEEE.Item Modal and random vibration analysis of pneumatic actuator of wastegate turbocharger using finite element method(Association of American Publishers, 2025) Patkar, R.; Joladarashi, S.Turbocharging is the most common power augmentation method used in both spark and compression ignition engines. However, the excessive turbo boost can end up in risking the intake manifold pressure which can negatively affect the performance of an engine. Therefore, the modern turbochargers are developed with wastegate which effectively controls the turbine speed and limits the excessive turbo boost bypassing the fraction of exhaust gas. In this work, the modal and random vibration analysis of the pneumatic actuator assembly of a wastegate turbocharger is presented. The turbocharger was substituted by a dummy vibratory shaker table with test spacers and a subassembly was mounted on the shaker table. The model of the actuator was designed in Creo© software and finite element analysis was performed in the commercially available software package ANSYS©. The materials used for critical components of the assembly were Structural Steel and SAE1008 Steel for the bracket and CAN respectively. Initially the structural load in the form of bolt pretension was applied at bolted joints and prestressed modal analysis was performed. The results of modal analysis were further utilized for random vibration analysis. The PSD acceleration input was given to the shaker table and output response at critical locations was analyzed. Subsequently, the results were quantitatively analyzed for modal participation factor variation, natural frequencies and PSD equivalent stresses in the actuator assembly. © 2025, Association of American Publishers. All rights reserved.