Sri Ramanujar Engineering College

Chennai, India

Sri Ramanujar Engineering College

Chennai, India

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Murugeswari S.,Sri Ramanujar Engineering College | Mohideen S.K.,B.S. Abdur Rahman University
Communications in Computer and Information Science | Year: 2013

There are different factors that one would like to optimize when designing a VLSI circuit. Often they cannot be optimized simultaneously, only improve one factor at the expense of one or more others. The design of an efficient integrated circuit in terms of Power, Area and Speed has become a very challenging problem. Low power design of VLSI circuits has been identified as a critical technological need in recent years due to the high demand for portable consumer electronic products with more backup and less weight. Adders and multipliers are the most important arithmetic units in a general purpose processors and the major source of power dissipation. The objective of a good multiplier is to provide a physically compact, high speed and low power consuming chip. Fast multipliers are the key components of many high performance systems such as FIR filters, Microprocessors, Digital signal processors etc. A system performance is generally determined by the performance of the multiplier because the multiplier is generally the slowest element in the system. Furthermore, it is generally the most area consuming. Hence, optimizing the speed and area of the multiplier is the major design issue. However, area and speed are usually conflicting constraints so that improving speed results in larger areas. In this paper we are using the Modified Carry Save adder which is used to speed up the final addition in many parallel multipliers. © 2013 Springer-Verlag.


Murugeswari S.,Sri Ramanujar Engineering College | Kaja Mohideen S.,B.S. Abdur Rahman University
Research Journal of Applied Sciences, Engineering and Technology | Year: 2015

In Digital Signal Processing, Finite Impulse Response (FIR) filter is mostly used for communications and radar applications. The Performance of FIR filter depends on Multiplier and adder circuits used in filter. To reduce the dynamic power consumption and chip size, different multiplier and adder combinations are used in order to improve the overall performance of FIR filter. The Low Power Modified Square Root Carry Select Adder (M-SQRT CSLA) is presented in this study by introducing half adders instead of full adders. The proposed M-SQRT CSLA has been designed to reduce dynamic power consumption. Hence the modified SQRT CSLA is applied into Wallace multiplier for addition process after the partial product generation stage. MAC unit of the Digital FIR filter is designed by using modified Wallace multipliers and M-SQRT CSLA. Further the Group 2, Group 3; Group 4 and Group5 structures of SQRT CSLA were constructed using half adders only. Comparison between proposed SQRT CSLA and Modified Carry Save Adder (MCSA) has been done with reference to the Area, Power and Delay. It is proved that the proposed SQRT CSLA consumes less area and power than all other methods. Simulation is performed by Modelsim6.3c and Synthesis process is done by Xilinx 10.1. The simulation result shows that digital filter with proposed SQRT CSLA occupies less area and consumes low power. © Maxwell Scientific Organization, 2015.


Marudhu G.,Sri Ramanujar Engineering College | Marudhu G.,B.S. Abdur Rahman University | Krishnan S.,B.S. Abdur Rahman University | Vijayaraghavan G.V.,B.S. Abdur Rahman University
Optik | Year: 2014

The semiorganic crystal of sodium acid phthalate (NaAP) single crystals was grown in the solvent of water by slow evaporation method at room temperature. The single crystal X-ray diffraction studies showed the crystal belongs to orthorhombic system. The optical absorption spectrum reveals that the crystal has good transparency in entire visible region. The hardness number of the material is measured by microhardness tester. The fluorescence green colour emission exhibits is semiorganic. The SHG efficiency of NaAP crystal confirms NLO behaviour of green colour emission to provide frequency doubling process for photo electronic applications. © 2014 Elsevier GmbH. All rights reserved.


Thilak T.,B.S. Abdur Rahman University | Thilak T.,Sri Ramanujar Engineering College | Ahamed M.B.,B.S. Abdur Rahman University | Vinitha G.,Vellore Institute of Technology
Optik | Year: 2013

Single crystal of potassium dichromate (KDC) has been grown from aqueous solution by slow evaporation technique. The lattice parameters of the grown crystal were determined by X-ray diffraction analysis. The optical absorption studies reveal that the crystal has UV cut-off wavelength around 240 nm. Thermo gravimetric and differential thermal (TGA/DTA) studies revealed that the crystal thermally stable up to 397.1 C. The mechanical strength of the grown crystal was carried out by Vickers micro hardness test. The crystal perfection was confirmed by etching studies. Third order nonlinear optical studies was performed using by single beam Z-scan technique using continuous Nd:YAG laser. Closed aperture Z-scan studies reveal the negative nonlinearity in the crystals and open aperture Z-scan reveals the saturation absorption. Also various parameters such as nonlinear refractive index n2, absorption co-efficient β and nonlinear optical susceptibility χ(3) were calculated for the grown crystal. © 2013 Elsevier GmbH.


Thirugnanaselvi S.,Sri Ramanujar Engineering College | Kuttirani S.,B.S. Abdur Rahman University | Emelda A.R.,Sri Ramanujar Engineering College
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2014

Schiff base derived from the condensation reaction of analar grade 1-amino-2-naphthol 4-sulphonic acid with cinnamaldehyde was prepared under microwave condition. The Schiff base was analysed by infrared spectroscopy. This Schiff base as a corrosion inhibitor of AZ31 magnesium alloy in 0.05 mol/L HCl solution was studied. The inhibition effect of the Schiff base compound (4Z)-4-(3-phenyl allylidene amino)-3-hydroxy naphthalene-1-sulfonic acid (AC) on AZ31 magnesium alloy corrosion was studied using mass loss, potentiodynamic polarization technique, electrochemical impedance spectroscopy methods. The potentiodynamic polarization curve shows that Schiff base AC inhibits both anodic and cathodic reactions at all concentration, which indicates it is a mixed type inhibitor. EIS results indicate that as the additive concentration is increased, the polarization resistance increases whereas double-layer capacitance decreases. The adsorption of AC on the AZ31 magnesium alloy surface in 0.05 mol/L HCl obeys the Langmuir adsorption isotherm. © 2014 The Nonferrous Metals Society of China.


Janakiraman R.,Sri Ramanujar Engineering College | Paramasivam S.,ESAB Engineering Services Ltd.
Communications in Computer and Information Science | Year: 2013

The objective of the research work is to propose a Novel Method for Modeling, Simulation and Design analysis of a Self-Excited Induction Machine for Wind Power Generation (SEIMWPG). The earlier models of such generators are facing huge mechanical losses, due to wear and tear in the tightly coupled mechanical gear systems and could not provide maximum efficiency. In this paper, the self-excited induction machine based wind electric generator design has been presented, it is possible to get maximum power with the variation of the mutual inductance of the stator and rotor windings, irrespective of the variation of wind velocities. The complete system is modeled and simulated in the MATLAB / SIMULINK environment. © 2013 Springer-Verlag.


Dhanapal A.,Sri Ramanujar Engineering College | Rajendra Boopathy S.,Anna University | Balasubramanian V.,Annamalai University
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

The extruded AZ61A magnesium alloy plates of 6 mm thickness were butt welded using friction stir welding (FSW) process. The corrosion behavior of the welds was evaluated by conducting immersion test in NaCl solution at different pH value, immersion time and chloride ion concentrations. An empirical relationship was established incorporating pH value, immersion time and chloride ion concentration to predict the corrosion rate of friction stir welds of AZ61A magnesium alloy at 95 confidence level. Three-factor, five-level central composite rotatable design was used to minimize the number of experimental conditions. Response surface method was used to develop the relationship. The results show that the corrosion resistance of AZ61A magnesium alloy welds in the alkaline solution is better than that in the acidic and neutral solutions, moreover, low corrosion rate is found at low concentrated solution and longer exposure time, and the corrosion morphology is predominantly influenced by the distribution of β-phase. © 2012 The Nonferrous Metals Society of China.


Dhanapal A.,Sri Ramanujar Engineering College | Boopathy S.R.,Anna University | Balasubramanian V.,Annamalai University
Materials and Design | Year: 2011

Magnesium (Mg) alloys shows the lowest density among other engineering metallic materials. As a consequence, this light alloy has a promising future. However, these alloys have great affinity for oxygen and other chemical oxidizing agents. The limitation of low corrosion resistance restricts their practical applications. Extruded Mg alloy plates of 6. mm thick of AZ61A grade were butt welded using friction stir welding (FSW) process. Corrosion behavior of the welds was evaluated by conducting salt fog test in NaCl solution at different chloride ion concentrations, pH value and spraying time. Also an attempt was made to develop an empirical relationship to predict the corrosion rate of friction stir welded AZ61A magnesium alloy. Three factors and a central composite design were used to minimize the number of experimental conditions. Response surface method was used to develop their relationship. The developed relationship can be effectively used to predict the corrosion rate of friction stir weld AZ61A magnesium alloy at 95% confidence level. © 2011 Elsevier Ltd.


Dhanapal A.,Sri Ramanujar Engineering College | Rajendra Boopathy S.,Anna University | Balasubramanian V.,Annamalai University
Journal of Alloys and Compounds | Year: 2012

Magnesium alloys have gained considerable interest as a structural material for automotive and aerospace applications due to its low-density, high specific strength and good castability. As a consequence, this light alloys have a promising future. The limitation of low corrosion resistance restricts their practical applications. The corrosion behavior of friction stir welded AZ61A magnesium alloy welds was investigated by Immersion technique. Extruded Mg alloy plates of 6 mm thick of AZ61A grade were butt welded using friction stir welding (FSW) process. The present paper reveals the effect of pH, chloride ion concentration and immersion time on corrosion rate of friction stir welded AZ61A magnesium alloy welds in NaCl solution. The corrosion rate was evaluated from weight loss measurements. Furthermore, an attempt was made to develop an empirical relationship to predict the effect of pH value, chloride ion concentration and immersion time on corrosion rate of AZ61A magnesium alloy welds. The corrosion morphology observation was carried out by optical microscopy and the corrosion products were analyzed by SEM and XRD analysis. © 2012 Elsevier B.V.


Janakiraman R.,Sri Ramanujar Engineering College | Janakiraman R.,Jawaharlal Nehru Technological University Anantapur | Paramasivam S.,ESAB Group
International Review on Modelling and Simulations | Year: 2013

This paper presents simulation approach for the performance analysis of self-excited induction generator (SEIG) for wind power application. The analysis like flux distribution, flux density distribution, and torque and force calculations through 2D finite element analysis (FEA). An induction machine model considered as phase voltage, phase angle calculations through ANSYS simulation. At the beginning, a numerical calculation of the magnetic field distribution of self-excited induction machine, under consideration is carried out. The results of numerical calculations are to be presented through ANSYS simulation and an evaluation of the steady state behavior of the self-excited induction generator is presented for the wind power application. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.

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