Villupuram, India
Villupuram, India

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Sankar M.,Surya Group of Institutions | Baskaran R.,Anna University | Rajkumar K.,SSN College of Engineering
Applied Mechanics and Materials | Year: 2014

In this paper, attempts have been made to model and optimize process parameters in Abrasive assisted Electro-Chemical Machining (AECM) of Aluminium-Boron carbide-Graphite composite using cylindrical copper tool electrodes with SiC abrasive medium. Optimization of process parameters is based on the statistical techniques with four independent input parameters such as voltage, current, reinforcement and feed rate were used to assess the AECM process performance in terms of material removal rate. The obtained results are compared with without abrasive assisted electro chemical machining of Aluminium-Boron carbide-Graphite composite. Abrasive assisted ECM process exhibited higher material removal rate from composite material when compared with without abrasive assisted ECM. © (2014) Trans Tech Publications, Switzerland.

Sankar M.,Surya Group of Institutions | Baskaran R.,Anna University
Applied Mechanics and Materials | Year: 2014

Unconventional machining is increasing in importance due to some of the specific advantages which can be exploited during machining operation. Electrochemical machining (ECM) appears to be a promising technique in many areas of application. The present paper deals with the application of response surface methodology (RSM) to optimize the machining parameters with multiple responses in electrochemical machining (ECM) of 7075 Al/B4C metal matrix composites. Experiments were conducted on a METATECH ECM setup and L orthogonal array was chosen for the experiments. The electrochemical machining parameters, namely applied voltage, feed rate, and current content, were optimized based on multiple responses, i.e. material removal rate, and surface roughness. The optimum machining parameters were calculated using RSM and results were compared with ANOVA. The results show that feed rate and voltage are the most significant parameters which affect multiple machining responses simultaneously. Experimental results show that the responses in ECM can be improved effectively through this approach. © (2014) Trans Tech Publications, Switzerland.

Sankar M.,Surya Group of Institutions | Gnanavelbabu A.,Anna University | Rajkumar K.,SSN College of Engineering
Procedia Engineering | Year: 2014

Aluminium metal matrix composites (AMMCs) are now gaining their used in aerospace and automotive industries. Among many AMMCs, Aluminium metal matrix reinforced with Boron Carbide (B4C) is a novel composite. This composite is widely used in automotive industries (brake pads and brake rotor) due to high wear resistance, high strength to low weight ratio, elevated temperature toughness and high stiffness. Boron carbide shows exotic properties such as neutron absorbing compared to other reinforcements such as Al2O3 and SiC. In order to improve tribological characteristics of Al-B4C, the graphite is added as a solid lubricant. Due to the presence of hard ceramic reinforcement in metal matrix, it is very difficult to machining by conventional methods. Even nontraditional processes such as laser jet machining and electro discharge machining result in significant subsurface damage and heat affected zone to the work. Electrochemical machining (ECM) is an advanced machining process that is used for the machining of aerospace and automotive components, and dies and molds, etc. In order to increase the material removal rate and surface quality of the work, fine size abrasive particles are mixed with electrolyte. This abrasive particles working along with anodic dissolution can increase the material removal rate. © 2014 The Authors.

Venkatasubbian V.,Bharathiar University | Mohan R.,Surya Group of Institutions | Punitha N.,St. Joseph's College | Thamizharasan K.,Sir Theagaraya College
Materials Letters | Year: 2016

The structural, optical and thermal behavior of ZnS nanocrystals co-doped with Ni2+ and Mn2+ isoelectronic impurities are reported. Simple and more productive chemical co-precipitation method is used to synthesis the co-doped semiconductor nanoparticles. X-ray diffraction (XRD) and High resolution transmission electron microscope (HRTEM/SAED) results indicated that co-doped ZnS nanoparticles with a polycrystalline zinc blend structure were homogeneously well dispersed in the polymer matrix. UV-vis spectra confirm the strong quantum confinement effect in the co-doped samples. Photoluminescence (PL) spectra revealed three fold increase in the emission intensity at optimal co-dopant concentration and further increase leads to a quenching effect by the dopants. The thermal stability of the composite semiconductor was determined by thermogravimetric analysis. © 2016 Elsevier B.V. All rights reserved.

Maalmarugan J.,Surya Group of Institutions | Baskaran J.,Surya Group of Institutions | Thamizharasan S.,Surya Group of Institutions
4th IEEE Sponsored International Conference on Computation of Power, Energy, Information and Communication, ICCPEIC 2015 | Year: 2015

In this paper, a new pulse width modulation switching strategy based on carrier amalgamation that provides maximum utilization of dc-link voltage in the linear region. The modified carrier is derived from the amalgamation of inverted sine and triangular carrier at the peak of reference sine waveform. The objective of the proposed strategy is to achieve enhanced fundamental voltage over wide output voltage range while improving THD. The performance of proposed modulation strategy is tested in single phase 11 level inverter in terms of fundamental component and total harmonic distortion (THD) through MATLAB/Simulink. © 2015 IEEE.

Jagan A.,Surya Group of Institutions | Nagarajan V.,Adhiparasakthi Engineering College
Przeglad Elektrotechniczny | Year: 2013

This paper proposes an Elliptic Curve Cryptography (ECC) co-processor over GF(2256), based on the Montgomery scalar multiplication algorithm and provides a comprehensive evaluation of the architecture when different multipliers are involved in the scalar multiplication. The multipliers, namely array multiplier, modified Booth multiplier and hybrid encoded low power (HELP) multiplier are considered for the study. The proposed architecture is designed using Spartan3E family device XC3S1600E and synthesized using Modelsim 5.7.

Thamizharasan S.,Surya Group of Institutions | Baskaran J.,Adhiparasakthi Engineering College | Ramkumar S.,RMD Engineering College | Jeevananthan S.,Pondicherry Engineering College
IET Power Electronics | Year: 2014

A new single-phase H-bridge multilevel inverter (MLI) topology constructed using auxiliary reverse-connected voltage sources along with a hybrid pulse width modulation (PWM) strategy is proposed, to extract a variable frequency variable amplitude output voltage. The principle eschews an astute philosophy to employ PWM approach only for a particular Hbridge that serves to produce the desired level while the remaining add-on modules function with the theory of fundamental switching. It involves the use of reduced number of switching devices for a specific number of output voltage levels in comparison with conventional MLIs. The design of the hybrid PWM suitable to power the appropriate switches add strength to its formulation in the sense it requires only either addition or subtraction to generate the square wave modulated pulses for the power devices in the other units other than that responsible for offering the preferred level of output voltage. The MATLAB R2010b-based simulated performance adequately validated through experimental results foresee the emergence of a new variety of MLIs and forge a different dimension for inverter interfaces in power control applications. © The Institution of Engineering and Technology 2014.

Thamizharasan S.,Surya Group of Institutions | Baskaran J.,Adhiparasakthi Engineering College | Ramkumar S.,RMD Engineering College | Jeevananthan S.,Pondicherry Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2013

This paper attempts to construct a new hybrid multilevel dc-link inverter (MLDCLI) topology with a focus to synthesize a higher quality sinusoidal output voltage. The idea emphasizes the need to reduce the switch count considerably and thereby claim its superiority over the existing multilevel inverter (MLI) configurations. The structure incorporates a new module along with a differently used H-bridge that facilitates the increase in levels with much lower switch counts. The proposed dual bridge MLDCLI (DBMLDCLI) is evaluated using phase disposition (PD) multi-carrier pulse width modulation (MC-PWM) strategy in a filed programmable gate array (FPGA) platform. The MATLAB/System generator based simulation results validated through FPGA based prototype for a typical output level exhibit the drastic enhancement in the quality of output voltage. The total harmonic distortion (THD) obtained using a harmonic spectrum reveals the mitigation of the frequency components of output voltage other than the fundamental and paves the way to open a new avenue for nurturing innovative applications in this domain. © 2012 Elsevier Ltd. All rights reserved.

Anbarasan P.,Surya Group of Institutions | Ramkumar S.,RMD Engineering College | Thamizharasan S.,Surya Group of Institutions
Proceedings of 2015 IEEE International Conference on Electrical, Computer and Communication Technologies, ICECCT 2015 | Year: 2015

Multilevel inverters (MLIs) have developed into a potential prospect for medium voltage applications as they produce the output voltage derived from several isolated dc sources or capacitor banks in small steps. However, they suffer from major problems including higher number of capacitors, isolated dc sources, gate drivers and control complexity while increasing number of voltage levels. This paper uncovers a new three-phase multilevel dc- link inverter topology overwhelming the above mentioned problems. The proposed topology is designed for a seven level output and simulated in Matlab/Simulink using Multicarrier Pulse Width Modulation (MCPWM). The hardware results are depicted to show the feasibility of the proposed MLI for medium voltage applications. © 2015 IEEE.

Mathew B.,Grace College | Suresh J.,Madras Medical College | Anbazhagan S.,Surya Group of Institutions | Devaraji V.,Madras Medical College
Central Nervous System Agents in Medicinal Chemistry | Year: 2013

A series of 1-(1H-benzimidazol-2-yl)-3-substituted phenylprop-2-en-1-ylidene] amino}-1,3,4-thiadiazole-2-thiols (6a-6f) were synthesized by the acid catalyzed nucleophilic addition reaction between 1-(1H-benzimidazol-2-yl)-3-phenylprop-2-en-1-ones (4a-4f) and 5-amino-1,3,4-thiadiazole-2-thiol. All the synthesized compounds were characterised by IR, 1HNMR, 13CNMR, Mass and elemental analyses. A transition state calculation obtained from DFT study to explore the molecular mechanism of action of the synthetic route. The mechanism of synthesis revealed that the imidazole system can make an increase in the electrophilic character of carbonyl carbon in the benzimidazole chalcones. So the electron deficient carbonyl carbon could be efficiently attacked on the amino group of 1,3,4-thiadiazole ring to forms an imine linkage between the two heterocyclic systems. All the titled derivatives at a dose level of 10mg/kg body weight potentiate the hypnotic action of Phenobarbitone (at a dose of 10mg/kg body weight i.p.). The compounds such as 6b, 6a, and 6c showed a significant percentage increase in sleeping time relative to the control experiment 423.8, 387.6 and 329.5 respectively. The preclinical evaluation of the compounds was ascertained by blood-brain barrier, human oral absorption prediction and in silico toxicity assessment. © 2013 Bentham Science Publishers.

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