Ayyappan S.,Government of Tamilnadu |
Sivakumar K.,Bannari Amman Institute of Technology
International Journal of Advanced Manufacturing Technology | Year: 2014
This paper investigates the performance enhancement of electrochemical machining (ECM) process by oxygenated aqueous sodium chloride (NaCl) electrolyte. It is experimentally found that the performance parameters such as material removal rate (MRR) and surface roughness (Ra) are greatly improved with this new mix of electrolyte. The oxygen gas is suitable to electrochemically react with aqueous NaCl solution to enhance the oxidation of metal oxides on the machined surface to increase the MRR. In this work, experimental investigations are conducted with both aqueous NaCl electrolyte and oxygenated aqueous NaCl electrolyte on the alloy steel specimen (20MnCr5). Largest MRR of 7.33 g/min with Ra of 1.90 μm is obtained in oxygenated NaCl environment compared to MRR of 1.98 g/min and Ra of 3.13 μm in aqueous NaCl environment with machining conditions of voltage (V) of 17 V, tool feed rate (F) of 0.5 mm/min, and electrolyte concentration (EC) of 142.5 g/l of water. Microstructure of surface of the specimen machined with oxygenated aqueous NaCl electrolyte is more homogeneous and promises a good surface quality. © 2014, Springer-Verlag London.
Perumalraja R.,Bannari Amman Institute of Technology |
Dasaradan B.S.,P.A. College
Indian Journal of Fibre and Textile Research | Year: 2011
A study on electromagnetic shielding effectiveness of electroless nickel plated copper core with polyester sheath yarn composite fabrics through Taguchi design and ANOVA has been reported. The electromagnetic shielding effectiveness of these conductive composite fabrics has been measured in the frequency range 200 - 1000 MHz using network analyzer equipment. It is observed that with an increase in palladium chloride and nickel (II) sulphate concentrations, the shielding effectiveness increases. The ANOVA results show that the time and temperature are negligible factors as compared to other factors.
Kaliammal N.,P.A. College |
Gurusamy G.,Bannari Amman Institute of Technology
International Journal of Communication Systems | Year: 2013
The need for on-demand provisioning of wavelength-routed channels with service-differentiated offerings within the transport layer has become more essential because of the recent emergence of high bit rate Internet protocol (IP) network applications. Diverse optical transport network architectures have been proposed to achieve the above requirements. This approach is determined by fundamental advances in wavelength division multiplexing (WDM) technologies. Because of the availability of ultra long-reach transport and all-optical switching, the deployment of all-optical networks has been made possible. The concurrent transmission of multiple streams of data with the assistance of special properties of fiber optics is called WDM. The WDM network provides the capability of transferring huge amounts of data at high speeds by the users over large distances. There are several network applications that require the support of QoS multicast, such as multimedia conferencing systems, video-on-demand systems, real-time control systems, etc. In a WDM network, the route decision and wavelength assignment of lightpath connections are based mainly on the routing and wavelength assignment (RWA). The multicast RWA's task is to maximize the number of multicast groups admitted or minimize the call-blocking probability. The dynamic traffic-grooming problem in wavelength-routed networks is generally a two-layered routing problem in which traffic connections are routed over lightpaths in the virtual topology layer and lightpaths are routed over physical links in the physical topology layer. In this paper, a multicast RWA protocol for capacity improvement in WDM networks is designed. In the wavelength assignment technique, paths from the source node to each of the destination nodes and the potential paths are divided into fragments by the junction nodes and these junction nodes have the wavelength conversion capability. By using the concept of fragmentation and grouping, the proposed scheme can be generally applied for the wavelength assignment of multicast in WDM networks. An optimized dynamic traffic grooming algorithm is also developed to address the traffic grooming problem in mesh networks in the multicast scenario for maximizing the resource utilization and minimizing the blocking probability. Copyright © 2011 John Wiley & Sons, Ltd.
Saravanan R.,Bannari Amman Institute of Technology
International Journal of Advanced Manufacturing Technology | Year: 2010
With the advent use of sophisticated and high-cost machines coupled with higher labor costs, concurrent optimization of machining process parameters and tolerance allocation plays a vital role in producing the parts economically. In this paper, an effort is made to concurrently optimize the manufacturing cost of piston and cylinder components by optimizing the operating parameters of the machining processes. Design of experiments (DoE) is adopted to investigate systematically the machining process parameters that influence product quality. In addition, tolerance plays a vital role in assembly of parts in manufacturing industries. For the selected piston and cylinder component, improvements efforts are made to reduce the total manufacturing cost of the components. By making use of central composite rotatable design method, a module of DoE, a mathematical model is developed for predicting the standard deviation of the tolerance achieved by grinding process. This mathematical model, which gives 93.3% accuracy, is used to calculate the quality loss cost. The intent of concurrent optimization problem is to minimize total manufacturing cost and quality loss function. Genetic algorithm is followed for optimizing the parameters. The results prove that there is a considerable reduction in manufacturing cost without violating the required tolerance, cutting force, and power. © 2010 Springer-Verlag London Limited.
Anandha Moorthy A.,Bannari Amman Institute of Technology
International Review of Mechanical Engineering | Year: 2013
AA2218 based self-lubricating metal matrix composite was prepared with 5, 10 & 15 weight percent of fly ash and 4 weight percentage of MoS2. Dry sliding wear behavior of self lubricating composite was tested at room temperature by pin on disc wear testing apparatus. Wear rate, Coefficient of friction and volume loss of self lubricating composite has been tested as the result of applied load, sliding velocity and weight percent of fly ash particles. From this investigation it was observed that the wear rate increases with the increasing load, at the same time wear rate and coefficient of friction get reduced to increase in wt. % of fly ash particles. Another dominant factor is the formation of the tribochemical layer at the interface, which was formed by MoS2. Formation of tribochemical layer was clearly observed from SEM micrographs. This study reveals that wear resistance of the self-lubricating composites containing 15 wt. % fly ash and 4 wt. % MoS2 has been superior to that of the other compositions. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.
Pongali Sathya Prabu N.,Bannari Amman Institute of Technology |
Madhu Mohan M.L.N.,Bannari Amman Institute of Technology
Journal of Molecular Liquids | Year: 2013
A novel series of linear supramolecular hydrogen bonded liquid crystals (SMHBLC) has been investigated. Complimentary hydrogen bonds are formed between various alkyloxy benzoic acids. Formation of hydrogen bond is confirmed by FTIR spectroscopic studies. These homologs exhibit rich phase variance as evinced by various textures by polarizing optical microscopic (POM) studies. DSC studies revealed the transition temperatures and corresponding enthalpy values which are elucidated from the DSC thermograms. Phase diagram has been constructed through POM and DSC data. An interesting finding is the observation of a new smectic ordering labeled as smectic X. This phase has been characterized by various techniques which includes XRD. Optical tilt angle in smectic C and smectic X phases of various homologs has been measured and fitted to a power law. Dielectric relaxations have been carried out in nematic and smectic C phases of different mesogens and their activation energies are calculated. An interesting observation is the optical shuttering action of the mesogens in the nematic phase. In addition to the above phenomenon the light filtering action of these mesogens in the nematic phase has been studied. © 2013 Elsevier B.V.
Boopathi S.,Bannari Amman Institute of Technology |
Sivakumar K.,Bannari Amman Institute of Technology
International Journal of Advanced Manufacturing Technology | Year: 2013
The near-dry wire-cut electrical discharge machining (WEDM) process is an environment-friendly manufacturing process, in which there is no harmful effect to the operators. The authors focus on the non-polluting ways to cut the materials and to meet the technical requirements like high material removal rate (MRR) and low surface roughness (Ra). In the near-dry WEDM, the finite discrete periodic series sparks between the wire electrode and conducting work material separated by minimum quantity of deionized water mixed with compressed air (air-mist) as a dielectric medium. In the present research, parametric analysis of the process has been performed with the molybdenum wire tool and high speed steel (HSS-M2) work piece. Experiments have been performed using air-mist as the dielectric medium to study the impact of gap voltage, pulse-on time, pulse-off time, airmist pressure and discharge current on the MRR and Ra using the mixed orthogonal (L18) array-Taguchi method. Taguchi based analysis of variance test was performed to identify the significant parameters. The gap voltage, pulse-on time, discharge current and air-mist pressure were found to have momentous effects on MRR and Ra. The best regression models for MRR and Ra have been developed by regression analysis. The optimal rough and finish cutting parameters have been predicted by Pareto-front using the multi-objective evolutionary algorithm (MOEA). © Springer-Verlag London 2012.
Dhanapal V.,Bannari Amman Institute of Technology |
Subramanian K.,Bannari Amman Institute of Technology
Carbohydrate Polymers | Year: 2014
Double network polymers (DNP) of different compositions were photosynthesized using sodium alginate (NaAlg) and superabsorbent polymer (SAP). They were characterized by FT-IR, thermal stability (TG), morphology by scanning electron microscopy (SEM), and its mechanical properties were also evaluated for their dye adsorption-desorption characteristics via adsorption isotherms at different temperature and pH values. The spectrophotometric determination of adsorbed dye indicated that the maximum dye uptake in column mode was 439 mg/g. The nearly identical visible absorption spectra of the fabrics dyed with virgin and recovered dyes indicated that the recovered dye retained its structural stability during column recovery and the dyed fabrics possess good color fastness properties. Dye adsorption kinetic and de-sorption mechanism were found to be pseudo-first-order and non-Fickian, respectively. The adsorption showed best fit for Langmuir adsorption isotherm. The changes in the thermodynamic parameters namely Gibbs free energy (ΔG°), entropy (ΔS°) and enthalpy (ΔH°) for the dye-adsorbent systems inferred that the adsorption process was spontaneous and exothermic. © 2014 Elsevier Ltd.
Perumalraj R.,Bannari Amman Institute of Technology
Journal of Industrial Textiles | Year: 2013
A study of single-stage antimicrobial and crease proof finishing of cotton materials has been reported. The bleached and reactive dyed cotton woven fabrics have been selected for this finishing process. The various concentrations of DMDHEU and triclosan and temperature have been selected to analyze the crease recovery and antimicrobial properties of fabric using Box-Behnken design. It was observed that increasing the concentration of DMDHEU and triclosan increases the crease recovery angle. It is also observed that the breaking strength retention properties have been reduced when increasing the concentration of DMDHEU and triclosan and temperature. It is also found that the antimicrobial effect was increased when the concentration of DMDHEU and triclosan increased. © The Author(s) 2012 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.
Kavitha C.,Bannari Amman Institute of Technology |
Madhu Mohan M.L.N.,Bannari Amman Institute of Technology
Journal of Physics and Chemistry of Solids | Year: 2012
Design, synthesis and characterization of seven linear hydrogen bonded liquid crystal complexes derived from mesogenic p-n-decyloxy benzoic acid and p-n-alkyl benzoic acids designated as 10OOn (where n varied from ethyl to octyl) are reported. FTIR studies confirm the hydrogen bond formation in all these complexes. The phase transition temperatures and their corresponding enthalpy values are experimentally deduced from Differential Scanning Calorimetry (DSC) studies. POM and DSC data are further utilized for the construction of 10OOn phase diagram. Two Odd-even effects have been evinced, one in enthalpy values and the other in corresponding transition temperatures across the isotropic to nematic phase transition. An interesting result is the observation of re-entrant smectic ordering, designated as smectic C R in three higher ordered mesogens. A new smectic ordering, smectic X, has been observed which is sandwiched between traditional smectic C and re-entrant smectic C R. Magnitudes of optical tilt angle in smectic C, smectic X and smectic C R are experimentally found to attain saturation with decrement of temperature in the corresponding phase. The occurrence of smectic X and smectic C R are discussed with relation to the molecular chemical structure. The optical filtering action in smectic C and re-entrant smectic C R phases have been analyzed. © 2012 Elsevier Ltd.