Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Subject: search.filters.subject.Modal Analysis

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    Frequency and deflection analysis of cenosphere/glass fiber interply hybrid composite cantilever beam
    (American Institute of Physics Inc. subs@aip.org, 2018) Bharath, J.; Joladarashi, S.; Biradar, S.; Kumar, P.N.
    Interply hybrid laminates contain plies made of two or more different composite systems. Hybrid composites have unique features that can be used to meet specified design requirements in a more cost-effective way than nonhybrid composites. They offer many advantages over conventional composites including balanced strength and stiffness, enhanced bending and membrane mechanical properties, balanced thermal distortion stability, improved fatigue/impact resistance, improved fracture toughness and crack arresting properties, reduced weight and cost. In this paper an interply hybrid laminate composite containing Cenosphere reinforced polymer composite core and glass fiber reinforced polymer composite skin is analysied and effect of volume fraction of filler on frequency and load v/s deflection of hybrid composite are studied. Cenosphere reinforced polymer composite has increased specific strength, specific stiffness, specific density, savings in cost and weight. Glass fiber reinforced polymer composite has higher torsional rigidity when compared to metals. These laminate composites are fabricated to meet several structural applications and hence there is a need to study their vibration and deflection properties. Experimental investigation starts with fabrication of interply hybrid composite with cores of cenosphere reinforced epoxy composite volume fractions of CE 15, CE 25, CE15-UC as per ASTM E756-05C, and glasss fiber reinforced epoxy skin, cast product of required dimension by selecting glass fibre of proper thickness which is currently 0.25mm E-glass bidirectional woven glass fabric having density 2500kg/m3, in standard from cast parts of size 230mmX230mmX5mm in an Aluminum mould. Modal analysis of cantilever beam is performed to study the variation of natural frequency with strain gauge and the commercially available Lab-VIEW software and deflection in each of the cases by optical Laser Displacement Measurement Sensor to perform Load versus Deflection Analysis. Young's Modulus values obtained from deflection equation of cantilever beam with different respective load versus deflection values are compared and validated with value obtained using first mode of natural frequency equation of cantilever beam. © 2018 Author(s).
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    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.