Anand Babu K.,Sri Venkateswara University |
Vijaya Kumar G.,Yogananda Institute of Technology and Science
International Journal of Engineering and Technology | Year: 2015
Now a day the reasons for an increase in the interest to perform machining operations in dry/near-dry environments are health and safety on the cost, operator, ease of chip recyclability, etc. However the important machining process, which is difficult to perform in dry environment, is drilling. Without coolant, drilling leads to high thermal distortion and poor tool life. In order to overcome these conflicts, it is essential to study the machining performances with minimum quantity lubrication (MQL) environment and dry environment. In the present paper Drilling experiments are conducted according to Taguchi L27 on AL7075-10%SiCp metal matrix composite with uncoated and coated HSS tools under MQL environment. The responses of drilling are analyzed using the Taguchi-Fuzzy model and the best combinations of process parameters are identified.
Kumar K.N.,Yeungnam University |
Kang M.,Yeungnam University |
Sivaiah K.,Yogananda Institute of Technology and Science |
Ravi M.,Harbin Institute of Technology |
Ratnakaram Y.C.,Sri Venkateswara University
Ionics | Year: 2015
Polymer blended films of polyethylene oxide (PEO) + polyvinyl pyrrolidone (PVP):lithium perchlorate (LiClO4) embedded with silver (Ag) nanofiller in different concentrations have been synthesized by a solution casting method. The semi-crystalline nature of these polymer films has been confirmed from their X-ray diffraction (XRD) profiles. Fourier transform infrared spectroscopy (FTIR) and Raman analysis confirmed the complex formation of the polymer with dopant ions. Dispersed Ag nanofiller size evaluation study has been done using transmission electron microscopy (TEM) analysis. It was observed that the conductivity increases when increasing the Ag nanofiller concentration. On the addition of Ag nanofiller to the polyethylene oxide (PEO) + polyvinyl pyrrolidone (PVP):Li+ electrolyte system, it was found to result in the enhancement of ionic conductivity. The maximum ionic conductivity has been set up to be 1.14 × 10−5 S cm−1 at the optimized concentration of 4 wt% Ag nanofiller-embedded (45 wt%) polyethylene oxide (PEO) + (45 wt%) polyvinyl pyrrolidone (PVP):(10 wt%) Li+ polymer electrolyte nanocomposite at room temperature. Polyethylene oxide (PEO) + polyvinyl pyrrolidone (PVP):Li+ +Ag nanofiller (4 wt%) cell exhibited better performance in terms of cell parameters. This is ascribed to the presence of flexible matrix and high ionic conductivity. The applicability of the present 4 wt% Ag nanofiller-dispersed polyethylene oxide (PEO) + polyvinyl pyrrolidone (PVP):Li+ polymer electrolyte system could be suggested as a potential candidate for solid-state battery applications. Dielectric constants and dielectric loss behaviours have been studied. © 2015 Springer-Verlag Berlin Heidelberg
Sreenivasulu P.,Yogananda Institute of Technology and Science |
Bhaskar Reddy N.,Sri Venkateswara University
Journal of Applied Fluid Mechanics | Year: 2016
An analysis of the thermal radiation effects on MHD boundary layer flow past a permeable exponential stretching surface in the presence of Joule heating and viscous dissipation is presented. Velocity and thermal slips are considered instead of no-slip conditions at the boundary. Stretching velocity and wall temperature are assumed to have specific exponential function forms. The governing system of partial differential equations is transformed into a system of ordinary differential equations using similarity transformations and then solved numerically using the Runge-Kutta fourth order method along with shooting technique. The effects of the various parameters on the velocity, shear stress, temperature and temperature gradient profiles are illustrated graphically and discussed in detail. The influence of the slip parameters causes significant fluctuations in velocity of the flow field. Viscous dissipation characterized by Eckert number enhances the temperature of the fluid, as the heat gets transferred from the sheet to the fluid.
Subbaramaiah K.,Yogananda Institute of Technology and Science |
Mohan V.C.J.,Svuniversity |
European Journal of Scientific Research | Year: 2011
This paper presents the design of dual mode controller for Automatic Generation Control (AGC) of hydrothermal system under deregulated environment employing particle swarm optimization (PSO). FACTS devices like Static Synchronous Series Compensator (SSSC) and Thyristor Controlled Phase Shifter (TCPS) have also been employed to further increase the dynamic performance of the system in terms of peak time, overshoot and settling time. The concept of soft computing techniques greatly helps in overcoming the disadvantages posed by the conventional controllers. Open transmission access and the evolving of more socialized companies for generation, transmission and distribution affects the formulation of AGC problem. So the traditional AGC system is modified to take into account the effect of bilateral contracts on the dynamics. Simulation results show that the system employing PSO based dual mode controller along with SSSC and TCPS has better dynamic performance over the system with integral controller and without SSSC and TCPS. © EuroJournals Publishing, Inc. 2011.
Reddy M.,Pukyong National University |
Kalla R.M.N.,Yogananda Institute of Technology and Science |
Dong L.S.,Pukyong National University |
Jeong Y.T.,Pukyong National University
Catalysis Communications | Year: 2015
The preparation and description of a novel secondary amine ionic liquid, di-n-butyl ammonium chlorosulfonate, is described. The di-n-butyl ammonium ionic liquid (DBA IL) was characterized by FT-IR, elemental analysis, NMR spectroscopies, and wide-angle X-ray scattering techniques, as well as thermogravimetric analysis. The DBA IL functions as an efficient, environmentally benign, and recyclable catalyst with short reaction times and high catalytic activity for the synthesis of a variety of N-containing bisphosphonates in high yields. Another merit of this ionic liquid shown that the purification of products by non-chromatographic method with good to excellent yields of the desired products. © 2014 Elsevier B.V. All rights reserved.