Faculty Publications
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Publications by NITK Faculty
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Item Detecting packet modification attack by misbehaving router(Institute of Electrical and Electronics Engineers Inc., 2014) Patil, R.; Tahiliani, M.P.The next generation Internet supports dynamic deployment of different protocols and heterogeneous applications. To support this, routers in next generation computer networks use general purpose programmable packet processors. The customization of routers introduces increased vulnerabilities and attacks that allow potential attackers to compromise the router. Since network routers play a key role in todays network data transport, they became an interesting targets for attackers. An attacker can mount different attacks like denial-of-service or man-in-the-middle by intelligently dropping, modifying or diverting packets arriving at a compromised router. In this paper, we considered the problem of detecting packet modification attack which is performed by an attacker through misbehaving router. Since it is necessary to differentiate malicious packet modification from regular packet modification, detecting such an attack is challenging task. We proposed a controller-based packet modification misbehavior detection technique that excellently detects malicious packet modification by using a hash-based comparison of incoming and outgoing packets of the router. Experiments were carried out using Mininet Simulator and based on the results obtained, we observe that our proposed technique unambiguously detects the malicious packet modification. © 2014 IEEE.Item Designing of Digital Odometer Processing for Vehicles(Institute of Electrical and Electronics Engineers Inc., 2019) Jawale, M.; Hindoddi, A.; Patil, R.; Daigavane, P.; Kumar, G.N.; Dhanwate, S.Vehicle Odometer system, designed to measure the distance traveled and the instantaneous velocity of the vehicle. An Odometer display system includes a control unit connected to an Ignition Keyon Switch of a vehicle to obtain the accumulated mileage by accumulating a pulse signal produced according to the running of the vehicle. The control unit stores odometer data in an EEPROM. The control unit also reads the odometer data stored in the BBRAM when the ignition key on switch is operated. The Digital Odometer is designed using the MPC55XX automotive controller to improve reliability and overall performance. As per the Functional Requirement for a Digital Odometer, the control strategy is developed for Odometer Processing. Digital Odometer has high accuracy with better visualization with more functions with less cost. This paper is going to propose the Processing of Digital odometer with improved speed of operation. © 2019 IEEE.Item Finite Element Formulation for Static and Time Dependent Transverse Deflection of Functionally Graded Sandwich Beams with Viscoelastic Core(Springer Science and Business Media Deutschland GmbH, 2023) Patil, R.; Joladarashi, S.; Kadoli, R.The present study describes the finite element (FE) formulation for static and time dependent deflection of functionally graded (FG) sandwich beams with viscoelastic core. The kinematics of the beam are derived as per Euler–Bernoulli beam model. Rule of mixture and power law index define the variation of properties of FG stiff layers and core is considered as isotropic. Standard Linear solid model is used to define time dependent shear modulus of viscoelastic material. Static deflection results are validated with available literature. Effect of parameters on static deflection are studied for various boundary conditions. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item Studies on crack propogation in plasma arc welded Ti-6Al-4V joint during erichsen cupping test(Blue Eyes Intelligence Engineering and Sciences Publication, 2019) Veeman, V.; Patil, R.; Sriram, G.; Siva Shanmugam, N.S.Formability is one of the important parameter which describes the quality of the sheet metal. It is the ability of sheet metal to undergo plastic deformation without being damaged. There are two types of formability tests. One is a simple test which includes tensile, bulge and hardness test, another is simulative test like Erichsen cupping test, limit done height test, swift cup test. In this paper, numerical and experiemntatal investigations of formability of Ti-6Al-4V sheet are presented. Plasm arc welding experiment is conducted on thin Ti-6Al-4V sheet and Erichsen cupping test is uysed as the test method to determine the Erichsen cupping parameters. Tests have been conducted on plasma arc welded thin Ti-6Al-4V joint sheet as well as on the parent metal. Erichsen cupping index (IE) and acture load are determined during experimentation. Finite element analysis is done using commerical ABAQUS code. The simulation results are compared with experimental results. Based on the results, it is observed that the formability of welded Ti-6Al-4V is more than the base metal and the predicted Erichsen cupping index (IE), fracture load are good in agreeembnt with the experimental results. © BEIESP.Item Studies on free and forced vibration of functionally graded back plate with brake insulator of a disc brake system(Springer Science and Business Media Deutschland GmbH info@springer-sbm.com, 2020) Patil, R.; Joladarashi, S.; Kadoli, R.The back plate with brake insulator of a disc brake system used in automobile is a sandwich structure. Mitigating brake squeal associated with the operation of the disc brake has been a focus of many automobile researchers. As on today’s practice, steel–acrylic–steel is used for back plate–brake insulator assembly. The present study focuses on proposing Al - Al 2O 3 functionally graded metal ceramic composite material (FGM) for the back plate attached with conventional Steel–Acrylic brake insulator. Accordingly, a comparison study is presented in terms of the free and forced vibration characteristics of different material combinations for back plate–brake insulator sandwich beams such as steel–acrylic–steel, FGM–acrylic–steel, FGM–acrylic–aluminium and steel–acrylic–aluminium. The associated governing equations for sandwich beam which are well established in the literature are presented, and they are solved for simply supported conditions using trigonometric displacement functions. The real and imaginary parts of the various parameters come into the picture because of complex shear modulus of viscoelastic core. The comparison study among the combinations reveals that the natural frequency, loss factor and with regard to dynamic loading the imaginary part of transverse displacement, axial displacement, stress and strain of FGM–acrylic–steel are higher. As a result, FGM–acrylic–steel is suitable combination for back plate and brake insulator assembly which enhances the damping capacity of overall disc brake system and also helps in reducing brake squeal problem associated with operation of disc brake system. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.Item Bending and vibration studies of FG porous sandwich beam with viscoelastic boundary conditions: FE approach(Taylor and Francis Ltd., 2023) Patil, R.; Joladarashi, S.; Kadoli, R.Bending and vibration characteristics of FG porous sandwich beam with viscoelastic boundary conditions are investigated. Complex shear modulus and associated loss factor are considered for the viscoelastic interlayer. The beam is constrained by viscoelastic supports (VES) at either end. Complex stiffness model is adopted for VES. The transverse deflection, natural frequency, loss factors, and mode shapes are obtained by varying VES stiffness. Furthermore, the study is extended to sandwich beams with various (H, O, V, and X) porosity patterns. The results convey that VES contribution in vibration damping is more predominant when the supports are less stiff (more viscous). © 2022 Taylor & Francis Group, LLC.Item Effect of porosity and viscoelastic boundary conditions on FG sandwich beams in thermal environment: Buckling and vibration studies(Elsevier Ltd, 2023) Patil, R.; Joladarashi, S.; Kadoli, R.The present study is carried out to investigate the combined effect of porosity and temperature on the buckling and vibration attributes of FG sandwich beams in the thermal environment using FE formulation. The modeled sandwich beam consisting of the viscoelastic core material is restrained by viscoelastic boundary conditions (VBCs). The FG face layers and core are subjected to temperature-dependent material properties. Complex stiffness model is adopted for VBCs. Porosity patterns such as H, V, X, and O are incorporated into FG face layers. The Lagrange equation is used to derive the sandwich beam's equilibrium equations of motion in static and dynamic conditions. The derived equilibrium equations are solved for buckling and vibration of the beam using the FE solution. Lagrange and Hermite shape functions are assumed for axial and transverse displacements. Critical buckling temperature (CBT), natural frequency (NF), and loss factors (LF) are obtained for various temperatures and boundary stiffness values (BSVs). Transverse buckling and vibration mode shapes are extracted for changing BSVs. The behavior of NF and LF at buckling temperature is also discussed. The existence of porosities ameliorates the buckling characteristics of the sandwich beam. VBCs expedite the vibration damping of sandwich beams alongside the viscoelastic core. The natural frequency and loss factor reach zero and infinity, respectively, when the temperature reaches CBT. © 2023 Institution of Structural Engineers