Rajalakshmi Engineering College

Thandalam, India

Rajalakshmi Engineering College , , is a private engineering college located at Thandalam, Sriperumbudur near Chennai, Tamil Nadu, India. The college was established in 1997 by the Rajalakshmi Educational Trust, Rajalakshmi Institutions and has been approved by All India Council of Technical Education , New Delhi. Wikipedia.

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Sivakumar P.,Rajalakshmi Engineering College | Arutchelvi M.,Alagappa Chettiar College of Engineering And Technology
Renewable Energy | Year: 2017

Grid connected PV systems are becoming increasingly popular due to an exponential energy demand and also due to depletion of fossil fuels and environmental concerns. However, extraction of peak power for such system which reduce cost has always been an area of concern. Many Maximum power point tracking (MPPT) algorithms were proposed for a two stage and single stage grid connected system with some limitations in system performance. A simple strategy to extract peak power from the grid connected PV with nonlinear load at Point of common coupling (PCC) is attempted. To achieve the same task in a single stage Photovoltaic (PV) grid system, two PV emulated virtual DC voltage sources are connected in series with the PV array. The operation of this strategy is tested under low irradiation and Voltage swell at the PCC connected to the grid. A control strategy to achieve dual mode control for MPPT and to regulate DC link voltage is achieved simultaneously by the proposed control. Analysis of the control strategy is carried out using MATLAB and experimentally validated with a TMS320F28335 controller. © 2017 Elsevier Ltd

Sendilvelan S.,Dr. M.G.R. Educational and Research Institute | Bhaskar K.,Rajalakshmi Engineering College
Rasayan Journal of Chemistry | Year: 2017

Diesel engines have been widely used for better efficiency and low emissions, but diesel engine produces more smoke, particulate matter and oxides of nitrogen and reducing all these emissions simultaneously is not possible as on today due to trade of between oxides of nitrogen and smoke. Engines emission can be decreased by employing fumigation. Using fumigation process emission composition can be reduced when compared to normal operation. In this work an attempt has been made to reduce oxides of nitrogen, hydrocarbon and carbon monoxide using methanol fuel in the combustion chamber. The chemical behaviors and reactions of methanol over hydrocarbons also analyzed. A single cylinder four stroke, 5hp, direct injection, engine test rig was used for experiment purpose. From the experimental analysis, it was found that alcoholic fuels can effectively be used in diesel engines with methanol fumigation using EFI kit that normally operates at high power outputs. The result shows that brake thermal efficiency is slightly decreased when compared without modification at all flow rates. © RASĀYAN. All rights reserved.

Venkateshwaran N.,Anna University | Venkateshwaran N.,Rajalakshmi Engineering College | Elaya Perumal A.,Anna University | Arunsundaranayagam D.,Anna University
Materials and Design | Year: 2013

Natural fibers offer many advantages over synthetic fibers but the notable disadvantage of natural fibers is its hydrophilic nature. Due to this nature an incompatibility between the fiber and matrix exist which decreases the properties of the composite. This defect can be overcome by chemical modification of fiber surface so as to make it less hydrophilic. In this work, alkali (NaOH) of various concentrations (0.5%, 1%, 2%, 5%, 10%, 15% and 20%) was used to treat the fiber surface and the effect of these concentrations on the mechanical and visco-elastic behaviour of the composites were carried out. From the experimental investigation, it is found that 1% NaOH treated fiber reinforced composites behaves superiorly than other treated and untreated fiber composite. Further, SEM image analysis also shows the effect of alkali concentration over the fiber surfaces which leads to improving the mechanical properties of the composite. © 2012 Elsevier Ltd.

Mani M.,Rajalakshmi Engineering College | Nagarajan G.,Anna University | Sampath S.,Rajalakshmi Engineering College
Energy | Year: 2011

Plastics have now become indispensable materials in the modern world and application in the industrial field is continually increasing. The properties of the oil derived from waste plastics were analyzed and found that it has properties similar to that of diesel. Waste plastic oil (WPO) was tested as a fuel in a D.I. diesel engine and its performance characteristics were analysed and compared with diesel fuel (DF) operation. It is observed that the engine could operate with 100% waste plastic oil and can be used as fuel in diesel engines. Oxides of nitrogen (NOx) was higher by about 25% and carbon monoxide (CO) increased by 5% for waste plastic oil operation compared to diesel fuel (DF) operation. Hydrocarbon was higher by about 15%. Smoke increased by 40% at full load with waste plastic oil compared to DF. Engine fueled with waste plastic oil exhibits higher thermal efficiency upto 80% of the full load and the exhaust gas temperature was higher at all loads compared to DF operation. © 2010 Elsevier Ltd.

Selvaraj C.,SSN College of Engineering | Anand S.,Rajalakshmi Engineering College
Computer Science Review | Year: 2012

The objective of this paper is to present a comprehensive survey of security issues in Reputation based Trust Management system (RTMS) also known in short as Reputation Management Systems for P2P networks. The wide adoption of P2P computing has enhanced content publishing, pervasive information collection, streaming of real-time sensed data and information sharing on an enormous global scale. At the same time, the open and anonymous nature of P2P makes it vulnerable to malicious attacks and the spread of malware. In this paper, we discuss in detail the different security attacks on P2P systems and have categorized them as network-related and peer-related attacks. RTMS helps to establish and evaluate Trust, which is the degree of belief that is established to prove that the right user is accessing the right resource. We have explained the different Trust Management schemes used in P2P networks and have compared them on the basis of trust establishment, security features, trust evaluation and weakness. We have surveyed the RTMSs currently in use and have compared them on the basis of reputation collection, aggregation, computation, storage and degree of centralization of reputation computation and management. We also present a comparison of protection provided by RTMs against the various security attacks discussed. Open research issues and challenges that have yet to be addressed in the design of current RTMs have been presented in detail. This survey can be used as a reference guide to understand Trust Management and RTMS for P2P networks and to further research in RTMSs to make them efficient, reliable and scalable to enable and promote the utilization of P2P systems for large communities and applications. © 2012 Elsevier Inc.

Selvaraj C.,SSN College of Engineering | Anand S.,Rajalakshmi Engineering College
Peer-to-Peer Networking and Applications | Year: 2012

The open and anonymous nature of P2P allows peers to easily share their data and other resources among multiple peers, but the absence of a defensible border raise serious security concerns for the users. There is a lack of accountability for the content that is shared by peers and it is hard to distinguish malicious users from honest peers. Establishing Trust relationship between peers can serve as the metric to determine the veracity of the shared content and reliability of the peers. Most of the research work in this area is on Reputation based trust management where trust is determined on the basis of recommendation of other peers. Such recommendations are subjective and can be biased. A number of peers can also collude to provide false testimony for malicious peers. This paper proposes a novel Trust model that combines peer profiling with anomaly detection technique. Each peer can establish trust based on its own prior activities with other peers by comparing the current activity of a peer with its historical data and Genetic Algorithm (GA) has been employed to detect the anomalous behavior. Peer profile is updated dynamically with every transaction using GA operator's crossover and mutation. This model has been tested using a file sharing application against common attacks and the results obtained are compared with statistical anomaly detection approach. © 2011 Springer Science+Business Media, LLC.

Joice C.S.,Saveetha Engineering College | Paranjothi S.R.,Rajalakshmi Engineering College | Kumar V.J.S.,Anna University
IEEE Transactions on Industrial Informatics | Year: 2013

Brushless DC (BLDC) motor drives are becoming more popular in industrial, traction applications. This makes the control of BLDC motor in all the four quadrants very vital. This paper deals with the digital control of three phase BLDC motor. The motor is controlled in all the four quadrants without any loss of power; in fact energy is conserved during the regenerative period. The digital controller dsPIC30F4011, which is very advantageous over other controllers, as it combines the calculation capability of Digital Signal Processor and controlling capability of PIC microcontroller, to achieve precise control. © 2012 IEEE.

Gangadharana R.P.,Rajalakshmi Engineering College | Krishnanb S.S.,Sri Venkateswara College of Engineering
Acta Physica Polonica A | Year: 2014

The molecular structure of 1-azanapthalene-8-ol was calculated by the B3LYP density functional model with 6-31G(d,p) basis set by Gaussian program. The results from natural bond orbital analysis have been analyzed in terms of the hybridization of atoms and the electronic structure of the title molecule. The stability of the molecule arising from hyper conjugative interactions, charge delocalization has been analyzed using natural bond orbital analysis. The electron density based local reactivity descriptors such as the Fukui functions were calculated. The dipole moment (μ) and polarizability (α), anisotropy polarizability (Δα) and first order hyperpolarizability (βtot) of the molecule have been reported.

Saravanan S.,Sri Venkateswara College of Engineering | Nagarajan G.,Anna University | Sampath S.,Rajalakshmi Engineering College
Fuel | Year: 2013

This work attempts to reduce the NOx emission of crude rice bran oil methyl ester with a marginal increase in smoke density and decrease in brake thermal efficiency in a stationary CI engine. Three factors namely fuel injection timing, quantity of exhaust gases recycled and fuel injection pressures were chosen with three levels and their combined effect were investigated. Experiments were designed by employing design of experiments method and tests were conducted as per Taguchi's L9 orthogonal array. Among the three, EGR is the most influencing factor at no load and part load to reduce NOx emission with less influence on smoke density while at full load fuel injection timing is more influential. Optimum combination level of factors was obtained by calculating multi response signal to noise ratio and simultaneously using Taguchi's parametric design and the obtained combination was confirmed through experiment. © 2010 Elsevier Ltd. All rights reserved.

Bhaskar K.,Rajalakshmi Engineering College | Nagarajan G.,Anna University | Sampath S.,Rajalakshmi Engineering College
Energy | Year: 2013

There is world-wide interest in the search for alternatives to petroleum derived fuels for diesel engines. Key driving factors are depleting fossil-fuel reserves all over the globe as well as the environmental impact of burning fossil fuels that cause pollution and global warming. Bio-diesel derived from edible oils, non-edible oils and animal fats can be used in diesel engines with little or no modification. Non-land-based renewable sources are becoming important for the production of biodiesel due to limited availability of land. Under these circumstances, fish oil extracted from wastes of processed marine fish and refined through transesterification becomes an attractive alternative for the production of biodiesel. In this work, performance and emission characteristics of FOME (fish oil methyl ester) and its blends are evaluated in a direct-injection single-cylinder constant-speed diesel engine primarily used in the agricultural sector. It is seen that 20% FOME blend gives almost the same brake thermal efficiency with lower unburned hydrocarbons, carbon monoxide and soot emissions but higher NOx (nitrogen oxides) emissions compared to diesel fuel. EGR (Exhaust Gas Recirculation) is used to control NOxemissions. Percentage of EGR is varied to determine optimum EGR for 20% FOME blend. © 2013 Elsevier Ltd.

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