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Jaiganesh V.,Sa Engineering College
Science and Technology of Welding and Joining | Year: 2016

In this paper, the influence of friction stir welding process parameters and impact of tool geometry on the microstructural characteristics and tribological properties of AZ80A magnesium alloy are experimentally investigated. Tool with three different pin profiles at a constant tool rotational speed ω to feedrate v ratio were employed. Additionally, detailed experimental measurements are also carried out on the hardness and wear losses of joints. The chemical compositions of fabricated joints are analysed using energy dispersive spectrometry. The taper cylindrical pin profiled tool exhibited sound joints under the 750 rev min-1/75 mm min-1 ratio. It is also found that the tool rotational speed plays a more significant role on the microstructural characteristics and mechanical properties of the joints, compared to feedrate. © 2016 Institute of Materials, Minerals and Mining Published by Maney on behalf of the Institute.

In this paper, a detailed investigation has been carried out to find out the impact of the process parameters including Tool rotational speed, welding direction at constant axial force and with a taper cylindrical pin profiled HSS tool during the Friction stir welding (FSW) of AZ31B magnesium alloy lap joints. This paper evaluates & examines in an elaborate manner, the influence of these FSW parameters in the microstructure & mechanical properties of AZ31B magnesium alloy. In short, AZ31B Mg alloys were friction stir welded by varying several different process parameters and the effects of these parameters on the joint quality, microstructure & mechanical properties were discussed comprehensively. This paper also experimentally proves & suggests the optimized process parameter values to be adopted for effective lap joining of AZ31B Magnesium alloys using FSW technique. © 2014 Published by Elsevier Ltd.

In this paper, the effects of axial force on the mechanical properties of AZ31B magnesium alloy flat plates during the Friction Stir Welding (FSW) process were investigated by carrying out the tensile tests as per the American Society for Testing and Materials (ASTM) E8M-11 standards. The tensile test results indicated that the increase of the axial force greatly improved the tensile shear load (TSL) of the friction stir welded joints at a constant tool rotational speed of 800 rpm and welding speed of 50mm/min. Sound lap joints with low distortion, lack of cavity and high tensile strength were successfully obtained with an axial force of 5kN. However, the TSL of the friction stir welded joints decreased when the axial forces were 3kN and 4kN with the same constant tool rotational and welding speed. © (2014) Trans Tech Publications, Switzerland.

In this paper, a detailed experimental investigation was carried on the impact of the effects of tool pin and shoulder diameter in joining the Al 63400 aluminium alloy using FSW process. Flat plates of 6 mm thickness have been selected as the base material for obtaining single butt welded joints. The tool materials used for joining these base material plates are High Speed Steel (HSS) and High Chromium High Carbon Steel (HCHCr). This paper experimentally investigates and suggests the appropriate, suitable tool material & tool geometry for producing good quality welds in joining of Al 63400 alloy using FSW process. © (2014) Trans Tech Publications, Switzerland.

Jaiganesh V.,Sa Engineering College
Advanced Materials Research | Year: 2014

In the Present paper, the effects of axial force, rotational speed of the FSW tool, welding speed and shoulder penetration on various mechanical properties of Aluminium alloy 6063 butt joint produced by Friction Stir Welding have been analyzed. The mechanical properties ike tensile strength, Yield strength and % Elongation have been tested using 6 mm thickness plate. The tool used for conducting the experiment was Hot Die Steel (HDS). The welding quality can be improved by enhancing the mechanical properties and minimizing the defects. Hence, analysing & examining the mechanical or physical properties and other relevant significant factors would help to enhance the weld reliability. Tensile Strength (TS), Percentage of Elongation & Yield Strength (YS) of FSW Al 6063 alloy has been carried out under different processing condition using Taguchi's experimental design. An optimum result has been obtained using main effects plot using S/N ratio values. The rotation speed of the FSW tool has been found dominant factor for TS followed by feed and shoulder penetration. Shoulder diameter shows the least effect on TS compared to parameters like Percentage of Elongation & Yield Strength (YS). © (2014) Trans Tech Publications, Switzerland.

Ranjani M.,Sathyabama University | Murugesan P.,Sa Engineering College
Applied Soft Computing Journal | Year: 2015

The conventional controller suffers from uncertain parameters and non-linear qualities of Quasi-Z Source converter. However they are computationally inefficient extending to optimize the fuzzy controller parameters, since they exhaustively search the optimal values to optimize the objective functions. To overcome this drawback, a PSO based fuzzy controller parameter optimization is presented in this paper. The PSO algorithm is used to find the optimal fuzzy parameters for minimizing the objective functions. The feasibility of the proposed PSO technique has been simulated and tested. The results are bench marked with conventional fuzzy controller and genetic algorithm for two types of DC/DC converters namely double input Z-Source converter and Quasi-Z Source converter. The results of both the DC/DC converters for several existing methods illustrate the effectiveness and robustness of the proposed algorithm. © 2014 Elsevier B.V. All rights reserved.

Sathyamurthy R.,Hindustan University | Kennady H.J.,Hindustan University | Nagarajan P.K.,Sa Engineering College | Ahsan A.,University Putra Malaysia
Desalination | Year: 2014

This work presents a few important factors that affect the performance of a triangular pyramid solar still. An experimental work has been conducted to find the effect of water depth on the performance of the triangular pyramid solar still. From the present study, it is concluded that the convective and evaporative heat transfer coefficients are important for designing solar distillation systems and the effect of temperature difference between the evaporative and condensing surfaces is also important to optimize the operating temperature range. The condensing area of the solar still is more than that of evaporating area. Thus the experimental results showed that the effect of depth of water in the solar still affects the fresh water production. Nevertheless, outdoor experimental tests were conducted to study the effect of wind speed variations to cool down the glass cover. It was found that increasing the wind speed from 1.5 to 3. m/s and to 4.5. m/s has the effect of increasing the still productivity by 8 and 15.5% respectively. © 2014 Elsevier B.V.

Ramesh Kumar A.,Sa Engineering College | Premalatha L.,Vellore Institute of Technology
International Journal of Electrical Power and Energy Systems | Year: 2015

Abstract The optimization is an important role in the wide geographical distribution of electrical power market, finding the optimum solution for the operation and design of power systems has become a necessity with the increasing cost of raw materials, depleting energy resources and the ever growing demand for electrical energy. Using adaptive real coded biogeography-based optimization (ARCBBO), we present the optimization of various objective functions of an optimal power flow (OPF) problem in a power system. We aimed to determine the optimal settings of control variables for an OPF problem. The proposed approach was tested on a standard IEEE 30-bus system and an IEEE 57-bus system with different objective functions. Simulation results reveal that the proposed ARCBBO approach is effective, robust and more accurate than current methods of power flow optimization in literature. © 2015 Elsevier Ltd.

Sivashankari C.K.,Sa Engineering College
2014 International Conference on Information Communication and Embedded Systems, ICICES 2014 | Year: 2014

In this paper, a production inventory model with defective items in which two levels of production are considered and it is possible that production started at one rate and after some time it may be switched over another rate such a situation is desirable in the sense that by starting at a low rate of production, a large quantum stock of manufacturing items at the initial stage is avoided, leading to reduction in the holding cost. A suitable mathematical model is developed and the optimal production lot size which minimizes the total cost is derived. The optimal solution is derived and an illustrative example is provided and numerically verified. The validation of result in this model was coded in Microsoft Visual Basic 6.0. © 2014 IEEE.

Anita E.A.M.,Sa Engineering College
Asian Journal of Information Technology | Year: 2014

The main assumption of ad hoc routing protocols is that all participating nodes do so in good faith without disrupting the operation of the protocol. However, due to the absence of properly protected media and well trusted infrastructures and the reliance on unknown third parties for data forwarding, Mobile Ad hoc Networks (MANETs) are intrinsically vulnerable to various attacks. The security issue of MANETs is even more challenging because of the involvement of multiple senders and multiple receivers. Achieving trustworthy and secure and reliable communication is a major technical challenge in MANETs. The main focus of this study is to propose a secure framework for routing attacks by authenticating nodes using localized certificate chains. This proposed architecture combines the certificate chaining techniques with the existing route discovery scheme of on-demand multicast routing protocols. © Medwell Journals, 2014.

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