Vignana Bharathi Institute of Technology
Vignana Bharathi Institute of Technology
Sekhar B.C.,Vignana Bharathi Institute of Technology |
Kishan N.,Osmania University |
Haritha C.,Mahatma Gandhi Institute
Journal of Thermophysics and Heat Transfer | Year: 2017
The present paper investigates numerically to study natural convection in a square cavity filled with a nanofluid porous medium. The nanofluid mathematical model proposed by Buongiorno is considered. The left side wall of the enclosure is heated, whereas the right side wall is cooled, and the bottom and upper walls are adiabatic. The analysis is formulated in terms of vorticity stream function procedure. The governing equations, which are continuity, momentum, and energy equations are, solved by the finite element method based on the Galerkin weighted residual approach. The relevant parameters for computations are radiation parameter, Rayleigh number, thermophoresis parameter, Brownian motion parameter, buoyancy ratio parameter, Lewis number, and heat source/sink parameter. The numerical results in terms of streamlines, isotherms, isoconcentrations, average and local skin friction coefficient, and Nusselt numbers are reported for various values of Nt, Nb, Ra, Le, Rd, and Q. Copyright © 2016 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Panchagnula K.K.,Vellore Institute of Technology |
Panchagnula K.K.,Vignana Bharathi Institute of Technology |
Palaniyandi K.,Vellore Institute of Technology
Journal of Materials Research and Technology | Year: 2017
Among various machining operations, drilling is the most commonly employed machining operation for polymer composite laminates owing to the need for joining structures. Work with commercial composites has identified numerous parameters during the drilling operation that can influence the drilling factors and the material damage. The present paper gives a precise review of drilling on current state of fiber reinforced polymer as well as nanopolymer composite laminates. Specifically, the influence of machining parameters, tool geometry, tool materials and tool types on the cutting force generation and delamination mechanisms. Based on the comprehensive literature survey from the past few years, it is noticed that limited research has been made and published concerning to nanopolymer composite drilling and has led to a partial understanding of the cutting mechanics activated in machining/drilling. Some key contributions such as experimental and numerical studies are urgently demanded to address accurately various projections in drilling of nano-particle reinforced FRP composite laminates. © 2017 Brazilian Metallurgical, Materials and Mining Association.
Krishnaiah V.,CVR College of Engineering |
Narsimha G.,JNTUH College of Engineering |
Subhash Chandra N.,Vignana Bharathi Institute of Technology
Advances in Intelligent Systems and Computing | Year: 2015
Data mining technique in the history of medical data found with enormous investigations resulted that the prediction of heart disease is very important in medical science. The data from medical history has been found as heterogeneous data and it seems that the various forms of data should be interpreted to predict the heart disease of a patient. Various techniques in Data Mining have been applied to predict the patients of heart disease. But, the uncertainty in data was not removed with the techniques available in data mining. To remove uncertainty, it has been made an attempt by introducing fuzziness in the measured data. A membership function was designed and incorporated with the measured value to remove uncertainty. Further, an attempt was made to classify the patients based on the attributes collected from medical field. Minimum distance K-NN classifier was incorporated to classify the data among various groups. It was found that Fuzzy K-NN classifier suits well as compared with other classifiers of parametric techniques. © Springer International Publishing Switzerland 2015.
Ratna Sunil B.,Rajiv Gandhi University |
Pradeep Kumar Reddy G.,Vignana Bharathi Institute of Technology
Cogent Engineering | Year: 2016
In the present work, AZ31B Mg alloy and Al6063 alloy rolled sheets were successfully joined by friction stir welding. Microstructural studies revealed a sound joint with good mechanical mixing of both the alloys at the nugget zone. Corrosion performance of the joint was assessed by immersing in 3.5% NaCl solution for different intervals of time and the corrosion rate was calculated. The joint has undergone severe corrosion attack compared with both the base materials (AZ31B and Al6063 alloys). The predominant corrosion mechanism behind the high corrosion rate of the joint was found to be high galvanic corrosion. From the results, it can be suggested that the severe corrosion of dissimilar Mg-Al joints must be considered as a valid input while designing structures intended to work in corroding environment. © 2016 The Author(s).
Sunil B.R.,Rajiv Gandhi University |
Reddy G.P.K.,Vignana Bharathi Institute of Technology |
Patle H.,Visvesvaraya National Institute of Technology |
Dumpala R.,Visvesvaraya National Institute of Technology
Journal of Magnesium and Alloys | Year: 2016
Surface metal matrix composites (MMCs) are a group of modern engineered materials where the surface of the material is modified by dispersing secondary phase in the form of particles or fibers and the core of the material experience no change in chemical composition and structure. The potential applications of the surface MMCs can be found in automotive, aerospace, biomedical and power industries. Recently, friction stir processing (FSP) technique has been gaining wide popularity in producing surface composites in solid state itself. Magnesium and its alloys being difficult to process metals also have been successfully processed by FSP to fabricate surface MMCs. The aim of the present paper is to provide a comprehensive summary of state-of-the-art in fabricating magnesium based composites by FSP. Influence of the secondary phase particles and grain refinement resulted from FSP on the properties of these composites is also discussed. © 2016.
Sampath B.S.,Vignana Bharathi Institute of Technology
URAI 2011 - 2011 8th International Conference on Ubiquitous Robots and Ambient Intelligence | Year: 2011
Automatic Fire Extinguisher Robot is a Hardware based model used to automatically extinguish the fire during fire accidents. A Robot has been developed which features to move in the direction with respect to the fire intensity. The Robot shield is coated with calcium silicate boards that are capable of withstanding very high temperatures. The principle used, was designed and experimented at a temperature of 300°C. The temperature sensing capability of the robot is varied by heating the Thermocouple ends to a cut-off temperature, above which the robot starts responding to the fire. The Robot finds its applications in Rescue operations during fire accidents where the possibility for service men to enter the fire prone areas is very less and also during wars to perform rescue functions. The most added advantage of this Robot is that it turns ON automatically as it detects the fire around its surroundings, using Thermocouple and tries to extinguish it by moving in the direction with respect to the fire. The temperature sensor provides a backup to the Thermocouple, if needed in vast circumstances. © 2011 IEEE.
Pakala H.G.M.,Vignana Bharathi Institute of Technology |
Raju K.V.S.V.N.,Computer Science and System Engineering |
Communications in Computer and Information Science | Year: 2011
Integration testing of Complex Embedded systems (CES) and associated interconnection network has not been discussed much in the literature. This paper focuses on integration testing among Embedded Processing Components (EPCs) that are (loosely coupled) interconnected via I/O ports. This paper models EPC as a deterministic FSM and describes its fault model that captures errors in the interface between the Hardware and software. The EPC integration with rest of ES (or another EPC) can be viewed as a system under test (SUT) composed of two parts: EPC1 that requires integration testing with the other EPC2. This paper models EPC integration testing as a general fault localization problem  between Communicating FSM. An example shows that the integration testing of two subsystems is a subset of general fault diagnostic problem and the faulty machine can be identified during integration. © Springer-Verlag Berlin Heidelberg 2011.
Subramanyam M.V.,Vignana Bharathi Institute of Technology |
Prasad P.V.N.,Osmania University |
Poornachandra Rao G.,Vignana Bharathi Institute of Technology
International Journal of Power Electronics and Drive Systems | Year: 2013
This paper deals about fuzzy logic control of closed loop controlled five level Multi Level Inverter (MLI) driven three phase induction motor. Three phase Induction motor is most widely used drive in Industries, so needs proper control of speed. Induction motor is fed from five level multilevel inverter which is controlled by fuzzy logic. The closed loop consists of two loops. First inner loop is current loop and second outer loop is speed loop. The torque is varied at different times and corresponding change in speed and Total Harmonic Distortion (THD) is observed. The MLI is controlled by Sinusoidal Pulse Width Modulation (SPWM) Technique. © 2012 Institute of Advanced Engineering and Science. All rights reserved.
Saikrishna N.,Rajiv Gandhi University |
Pradeep Kumar Reddy G.,Vignana Bharathi Institute of Technology |
Munirathinam B.,Indian Institute of Technology Madras |
Ratna Sunil B.,Rajiv Gandhi University
Journal of Magnesium and Alloys | Year: 2016
In the present study, AZ31 magnesium alloy sheets were processed by friction stir processing (FSP) to investigate the effect of the grain refinement and grain size distribution on the corrosion behavior. Grain refinement from a starting size of 16.4 ± 6.8 μm to 3.2 ± 1.2 μm was attained after FSP. Remarkably, bimodal grain size distribution was observed in the nugget zone with a combination of coarse (11.62 ± 8.4 μm) and fine grains (3.2 ± 1.2 μm). Due to the grain refinement, a slight improvement in the hardness was found in the nugget zone of FSPed AZ31. The bimodal grain size distribution in the stir zone showed pronounced influence on the corrosion rate of FSPed AZ31 as observed from the immersion and electrochemical tests. From the X-ray diffraction analysis, more amount of Mg(OH)2 was observed on FSPed AZ31 compared with the unprocessed AZ31. Polarization measurements demonstrated the higher corrosion current density for FSPed AZ31 (8.92 × 10-5A/cm2) compared with the unprocessed condition (2.90 × 10-5A/cm2) that can be attributed to the texture effect and large variations in the grain size which led to non-uniform galvanic intensities. © 2016.
Chandra Sekhar G.,Gmrinstitute Of Technology |
Subramanyam P.S.,Vignana Bharathi Institute of Technology
World Journal of Modelling and Simulation | Year: 2016
Multiphase transmission system is a serious contender to the conventional Three Phase System. The fault analysis of Six Phase system is studied and adequate protection scheme is developed. A Logical protection scheme of Six Phase Transmission System against shunt and series faults using Logic Based Detection of negative sequence currents is presented in this paper. World First Six Phase Transmission Line is operating between McCalmont bus and Springdale bus of Allegheny Power System (APS),USA. A few amount of work had been reported on protection of Six Phase Transmission System in literature. This paper bridges the gap and paves the way to boost the research in Protection of Six Phase Transmission System. The Proposed Protection Scheme is a Novel approach as it doesn't require any special algorithms and using logical approach. Because of this the fault will be cleared with in one cycle and also the previous history of the healthy wave form just few cycle before occurrence of the fault can be traced for further investigation. The voltages and currents under fault for various types of fault had been taken from earlier studies of fault analysis of Six Phase Transmission line of Allegheny Power System. The proposed Logic based protection scheme is simulated to get a Logic 1 for fault conditions and Logic '0' for healthy conditions by using MATLAB/SIMULINK for shunt and series faults of both Unsymmetrical and Symmetrical faults on different phases of Six Phase Transmission system.