Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Geometrically nonlinear vibration attenuation of functionally graded magnetoelectro-elastic shells(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2019) Kattimani, S.; Joladarashi, S.; Mahesh, V.In this paper, Geometrically Nonlinear Vibrations (GNV) of Functionally Graded Magneto-Electro-Elastic (FGMEE) shells integrated with a patch of Active Constrained Layer Damping (ACLD) treatment is studied. In case of FG material, properties vary along the z-coordinates using power-law index. Finite element model is developed for FGMEE doubly curved shell using a shear deformation theory by considering non linearity to analyze the FGMEE shell. The structure consists of magnetostrictive material (CoFe2O4) and piezoelectric material (BaTiO3) FGMEE doubly curved shell with piezoelectric composite (1-3 PZC) is used as a constraining layer for viscoelastic layer, which is modelled using Golla-Hughes-McTavish (GHM) method. The analysis is carried out in time domain by considering the effects of coupling coefficients, curvature ratio and patch location on the behaviour of the nonlinear frequency of the shell. The amplitude of vibrations reduces considerably by considering the active ACLD patches (1-3 PZC) of the FGMEE shell with nominal control voltage. © 2019 ASMEItem Experimental investigation on free vibration of composite beams implanted Ni-Ti shape memory alloy wires(American Institute of Physics Inc. subs@aip.org, 2019) Singh, R.K.; Murigendrappa, S.M.; Kattimani, S.The paper presents free vibration of shape memory alloy hybrid composite beams by experimentally. The hybrid composite beams are fabricated using glass fiber with epoxy resin matrix implanted with the Ni-Ti SMA wires with diameter 0.47mm. The rectangular cross-section of beams with sizes, thickness, 3mm, width, 20mm and length 250mm are considered in the investigation. Free vibration test has been performed for the cantilever beams to investigate the effect on the fundamental natural frequency shift by changing the current as well as increasing the number of SMA wires. The fundamental natural frequency of the beam has shifted on higher side, 12.82% for single wire and 35.48% for two wires implant under the influence of current in comparison with no current state. Further, as supplied current increases in the SMA wire the natural frequency of beam increases helps in improving the stiffness and encourages to avoid resonance state. © 2018 Author(s).Item Experimental investigation on modal characteristics of plain woven glass/carbon hybrid composite beams with fixed-free end condition(American Institute of Physics Inc. subs@aip.org, 2019) Suman, M.L.J.; Murigendrappa, S.M.; Kattimani, S.This paper presents an investigation on modal characteristics of plane woven glass/carbon hybrid composite beams with fixed-free end condition by experimentally. The composite beam specimens are extracted from composite laminates of 16 layers with different hybrid configurations fabricated using vacuum bagging technique. Experimentations have been performed to measure vibrational characteristics of beams. Based on the investigation, it has been revealed that hybridisation affects the vibration characteristics. First two natural frequencies of beam are increased by the use of higher stiffness fibres in the upper layer. The damping effect in the beam with carbon fibre as middle layer is found to be higher as compared to the dedicated plain woven glass composites. © 2018 Author(s).Item Influence of temperature on the vibration control of the laminated composite sandwich plate with a 3D printed PLA core(American Institute of Physics Inc., 2023) Kallannavar, V.; Kattimani, S.; Reddy, B.R.P.The current study looks at the effect of temperature on the vibration control properties of a laminated composite sandwich plate. The sandwich plates fabricated using the glass-epoxy composite face sheets and the 3D printed PLA core are used for the study. Three PZT5H piezoelectric patches are used for actuating, sensing, and controlling the laminated composite sandwich plate. The proportional controller with constant control gain is utilized to control of vibrating sandwich plate operating at 10° C, 20° C, and 30° C thermal environments. The proportional controller was designed in the basic LABVIEW programming platform. The physical analog input/output modules and amplifier units are effectively utilized to control the oscillating cantilever sandwich plate. The investigation revealed that the vibration attenuation characteristics of the PZT5H patch-assisted proportional controller increase with the increase in temperature. © 2023 Author(s).