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Chandra A.P.J.,University of Mysore | Chandra A.P.J.,Adichunchanagiri Institute of Technology
IEEE Transactions on Instrumentation and Measurement | Year: 2012

Laboratory experiments are integral part of science and engineering education. Automation is changing the nature of these laboratories, and the focus of the system designer is on the availability of various interfacing tools to access the laboratory hardware remotely with the integration of computer-supported learning environment. This paper presents the novel design techniques to access experiments on electrical machines remotely through the Web using virtual instrumentation (VI) tools. The general Web-interface architecture is presented to facilitate control and measurement of experimentation parameters online with complete isolation from the electrical line voltage. LabVIEW-supported VI tools are used to create the Web-based automation and control of the experiment hardware. The custom-built electrical hardware is designed to interface the Web server with the experimental resources and to support user-friendly interface to access the data online. The safety issues while operating the electrical machines online are addressed through the control logic designed by the graphical code. The designed system exploits the data acquisition and the LabVIEW features to extend the dc motor and generator experimentation online along with the acquired data that are presented in virtual meters as well as in graphical plots. © 2006 IEEE. Source

Gowda M.R.,Adichunchanagiri Institute of Technology
Indian Concrete Journal | Year: 2014

Papercrete is an incredible building material that is lightweight, amazingly insulate, and low cost. Ordinary Portland cement is the most widely used, though costly and energy intensive ingredient used in the production of concrete mixes. Unfortunately production of cement involves emission of large amounts of carbon dioxide in to the atmosphere, a major contributor for green house effect and global warming. Hence, it is inevitable to either to search for another material or partly replace it by an alternate material. Any such material which can be used as an alternate or as a supplementary to Portland cement should lead to a sustainable development. Our project aimed to find out an alternative form of construction for low income house schemes for the Society. Although 45% of discarded paper is recycled annually, 55% is thrown away or goes into the landfill. Therefore, efforts have been made to utilise the waste paper into concrete and form 'Papercrete'. Papercrete is a construction material which consists of paper sludge, fine aggregates and Portland cement. It is an environmental friendly material due to the significant recycling content of waste paper. In this investigation an attempt has been made to develop Papercrete mixes using waste paper along with locally available materials and studied some of the few hardened and durability properties of developed various Papercrete concrete mixes in the laboratory. Source

Suresha B.,Indian National Institute of Engineering | Ramesh B.N.,Adichunchanagiri Institute of Technology | Subbaya K.M.,Indian National Institute of Engineering | Ravi Kumar B.N.,Bangalore Institute of Technology | Chandramohan G.,Karpagam College of Engineering
Materials and Design | Year: 2010

The influence of graphite filler additions on two-body abrasive wear behaviour of compression moulded carbon-epoxy (C-E) composites have been evaluated using reciprocating wear unit and pin-on-disc wear unit under single pass and multi-pass conditions respectively. The carbon fabric used in the present study is a plain one; each warp fiber pass alternately under and over each weft fiber. The fabric is symmetrical, with good stability and reasonable porosity. Abrasive wear studies were carried out under different loads/abrading distance using different grades of SiC abrasive paper (150 and 320 grit size). Graphite filler in C-E reduced the specific wear rate. Further, the wear volume loss drops significantly with increase in graphite content. Comparative wear performance of all the composites showed higher specific wear rate in two-body wear (single-pass conditions) compared to multi-pass conditions. Further, the tribo-performance of C-E indicated that the graphite filler inclusion resulted in enhancement of wear behaviour significantly. Wear mechanisms were suggested and strongly supported by worn surface morphology using scanning electron microscopy. © 2009 Elsevier Ltd. All rights reserved. Source

Suresha B.,Indian National Institute of Engineering | Ramesh B.N.,Adichunchanagiri Institute of Technology | Subbaya K.M.,Indian National Institute of Engineering | Chandramohan G.,Karpagam College of Engineering
Journal of Composite Materials | Year: 2010

Fiber and particulate reinforced polymeric composites are known to possess high strength and attractive wear resistance in dry sliding conditions. Though the reinforcement and/filler type are known to control the properties, less is known about their tribo performance especially with graphite as filler material. How these composites perform in abrasive wear situations needs a proper understanding. Hence, the present investigation reports on the mechanical and three-body abrasive wear behavior of carbon fabric reinforced epoxy (C-E) and silane treated graphite filled C-E (Gr-C-E) composites. The mechanical properties were evaluated using Universal testing machine. In three-body wear tests, quartz particles of size 150-200 ?m were used as dry and loose abrasives. Three-body abrasive wear tests were conducted using rubber wheel abrasion tester under different loads/abrading distances. The results showed that the wear volume increased with increasing abrading distance and the specific wear rate decreased with abrading distance/load and depends on filler loading. However, the presence of silane treated graphite filler in C-E showed a promising trend. Further, the abrasive wear volume of composites has been correlated with mechanical properties such as hardness, tensile strength and percentage elongation. The worn surface features, when examined through scanning electron microscopy, showed more number of broken carbon fibers in C-E compared to graphite filled C-E composites. © The Author(s), 2010. Source

Ramesh B.N.,Adichunchanagiri Institute of Technology | Suresha B.,Indian National Institute of Engineering
Materials and Design | Year: 2014

Abrasive wear performance of fabric reinforced composites filled with functional fillers is influenced by the properties of the constituents. This work is focused on identifying the factors such as filler type, filler loading, grit size of SiC paper, normal applied load and sliding distance on two-body abrasive wear behaviour of the hybrid composites. Abrasive wear tests were carried on carbon fabric reinforced epoxy composite (C-E) filled with filler alumina (Al2O3) and molybdenum disulphide (MoS2) separately in different proportions, using pin-on-disc apparatus. The experiments were planned according to Taguchi L18 orthogonal array by considering five factors, one at two levels and the remaining at three levels, affecting the abrasion process. Grey relational analysis (GRA) was employed to optimize the tribological parameters having multiple-response. Analysis of variance (ANOVA) was employed to determine the significance of factors influencing wear. Also, the comparative specific wear rates of all the composites under dry sliding and two-body abrasive wear were discussed. The analysis showed that the filler loading, grit size and filler type are the most significant factors in controlling the specific wear rate of the C-E composite. Optimal combination of the process parameters for multi performance characteristics of the composite under study is the set with filler type as MoS2, filler loading of 10wt.%, grit size 320, load of 15N and sliding distance of 30m. Further, the optimal parameter setting for minimum specific wear rate, coefficient of friction and maximum hardness were corroborated with the help of scanning electron micrographs. © 2014 Elsevier Ltd. Source

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