Coimbatore, India
Coimbatore, India

PSG College of Technology is an autonomous, government aided, private engineering college in Coimbatore, India. It is affiliated to Anna University. The college offers a total of 48 full-time and part-time programs in Science, Engineering and Management at undergraduate and postgraduate levels. The college was founded in 1951 by Dr.G.R.Damodaran, who served as first Principal of the college. It is one of the many educational institutions nurtured by PSG & Sons Charities Trust. It is the first private engineering institution established in Tamil Nadu. The college is located in the same campus with the PSG Industrial Institute. It is the only college in India to have an industry attached to it. Wikipedia.


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Rajasekaran S.,PSG College of Technology
Structural Engineering and Mechanics | Year: 2013

The free vibration of axially functionally graded tapered arches including shear deformation and rotatory inertia are studied through solving the governing differential equation of motion. Numerical results are presented for circular, parabolic, catenary, elliptic and sinusoidal arches with hinged-hinged, hinged-clamped and clamped-clamped end restraints. In this study Differential Quadrature element of lowest order (DQEL) or Lagrangian Interpolation technique is applied to solve the problems. Three general taper types for rectangular section are considered. The lowest four natural frequencies are calculated and compared with the published results.


Rajasekaran S.,PSG College of Technology
International Journal of Mechanical Sciences | Year: 2013

The free bending vibration of rotating axially functionally graded (FG) Euler-Bernoulli tapered beams (ETB) with different boundary conditions are studied using Differential Transformation method (DTM) and differential quadrature element method of lowest order (DQEL). These two methods are capable of modeling any beam whose cross sectional area and moment of inertia vary along the beam. In order to verify the competency of these two methods, natural frequencies are obtained for problems by considering the effect of material non-homogeneity, taper ratio, rotating speed parameter, hub radius and tip mass. The results are tabulated and compared with the previous published results. © 2013 Elsevier Ltd.


Kuruvilla J.,PSG College of Technology | Gunavathi K.,PSG College of Technology
Computer Methods and Programs in Biomedicine | Year: 2014

Early detection of cancer is the most promising way to enhance a patient's chance for survival. This paper presents a computer aided classification method in computed tomography (CT) images of lungs developed using artificial neural network. The entire lung is segmented from the CT images and the parameters are calculated from the segmented image. The statistical parameters like mean, standard deviation, skewness, kurtosis, fifth central moment and sixth central moment are used for classification. The classification process is done by feed forward and feed forward back propagation neural networks. Compared to feed forward networks the feed forward back propagation network gives better classification. The parameter skewness gives the maximum classification accuracy. Among the already available thirteen training functions of back propagation neural network, the Traingdx function gives the maximum classification accuracy of 91.1%. Two new training functions are proposed in this paper. The results show that the proposed training function 1 gives an accuracy of 93.3%, specificity of 100% and sensitivity of 91.4% and a mean square error of 0.998. The proposed training function 2 gives a classification accuracy of 93.3% and minimum mean square error of 0.0942. © 2013 Elsevier Ireland Ltd.


Gunaseelan V.N.,PSG College of Technology
Waste Management and Research | Year: 2014

In this study, I investigated the chemical characteristics, biochemical methane potential, conversion kinetics and biodegradability of untreated and NaOH-treated Pongamia plant parts, and pod husk and press cake from the biodiesel industry to evaluate their suitability as an alternative feedstock for biogas production. The untreated Pongamia seeds exhibited the maximum CH4 yield of 473 ml g -1 volatile solid (VS) added. Yellow, withered leaves gave a yield as low as 122 ml CH4 g -1 VS added. There were significant variations in the CH4 production rate constants, which ranged from 0.02 to 0.15 d -1, and biodegradability, which ranged from 0.25 to 0.98. NaOH treatment of leaf and pod husk, which were highly rich in fibers, increased the yields by 15-22% and CH4 production rate constants by 20-75%. Utilization of Pongamia wastes in biogas digesters not only influences the economics of biodiesel production but also yields CH4 fuel and protects the environment. The experimental data from this study were used to develop a multiple regression model, which could estimate biodegradability based on biochemical characteristics. The model predicted the biodegradability of previously published biomass wastes (r2 = 0.88) from their biochemical composition. The theoretical CH4 yields estimated as 350 ml g-1 chemical oxygen demand destroyed are much higher than the experimental yields as 100% biodegradability is assumed for each substrate. Upon correcting the theoretical CH4 yields with biodegradability data obtained from chemical analyses of substrates, their ultimate CH4 yields could be predicted rapidly. © The Author(s) 2014.


Manoj Kumar P.,PSG College of Technology | Parthasarathy V.,PSG College of Technology
Energy | Year: 2013

Water management in an AB-PEMFC (air-breathing proton exchange membrane fuel cell) poses a big challenge due to its passive operation. The issue is addressed in a passive way by designing the fuel cell with low thermal conductivity materials. Use of low thermal conductivity materials for cell fabrication led to higher cell temperatures. The liquid water formation was delayed to high current densities due to increase in saturation pressure and higher buoyancy induced flow. Peak power density was increased by 36% and the limiting current density was increased by 37.5% when the cell was redesigned with low thermal conductivity materials. Fabricating the cells with low thermal conductivity materials can be very effective method of water management for air-breathing single PEM (proton exchange membrane) fuel cells and stacks of low capacity. © 2012 Elsevier Ltd.


Rajasekaran S.,PSG College of Technology
Meccanica | Year: 2014

Differential transformation method is used to obtain the shape functions for nodal variables of an arbitrarily non-uniform curved beam element including the effects of shear deformation considering axially functionally graded material. The proposed shape functions depend on the variations in cross-sectional area, moment of inertia, curvature and material properties along the axis of the curved beam element. The static and free vibration of axially functionally graded tapered curved beams including shear deformation and rotary inertia are studied through solving several examples. Numerical results are presented for circular, parabolic, catenary, elliptic and sinusoidal beams (both forms - prime and quadratic) with hinged-hinged, hinged-clamped and clamped-clamped and clamped-free end restraints. Three general taper types (depth taper, breadth taper and square taper) for rectangular cross section are studied. Out of plane vibration is studied and the lowest natural frequencies are calculated and compared with the published results. Out of plane buckling is investigated for circular beams due to radial load. © 2013 Springer Science+Business Media Dordrecht.


Rathinasamy A.,PSG College of Technology
Nonlinear Analysis: Real World Applications | Year: 2012

In this paper, a class of split-step θ-methods for solving stochastic age-dependent population equations with Markovian switching is constructed. The main aim of this paper is to investigate the convergence of the split-step θ-methods of stochastic age-dependent population equations with Markovian switching. It is proved that the split-step θ-methods converge to the analytical solutions of the equations under given conditions. An example is given for illustration. © 2011 Elsevier Ltd. All rights reserved.


The free vibration of axially functionally graded (FG) non-uniform beams with different boundary conditions is studied using Differential Transformation (DT) based Dynamic Stiffness approach. This method is capable of modeling any beam (Timoshenko or Euler, centrifugally stiffened or not) whose cross sectional area, moment of Inertia and material properties vary along the beam. The effectiveness of the method is confirmed by comparing the present results with existing closed form solutions and numerical results. In FG beams, flexural rigidity and mass density may take majority of functions including polynomials, trigonometric and exponential functions (converted to polynomial expressions). DT based Dynamic stiffness approach is proved to be a versatile and simple approach compared to many other methods already proposed. © Springer Science+Business Media 2012.


Patent
PSG College of Technology | Date: 2014-07-17

A portable plug-and-play intelligent system for monitoring and controlling process variations of a workpiece of a machine is provided. The portable plug-and-play intelligent system includes one or more sensors, a controller, a work piece, a plug & play modular fixture with a motor, a database, a comparison unit, and a control unit. The one or more sensors collect real-time data of the workpiece from the machine. The controller processes the real-time data collected from the one or more sensors. The database stores the processed real-time data. The comparison unit compares the real-time data of the workpiece with predefined specifications of the workpiece to check whether the real-time data is accurate or not. The control unit triggers the motor to allow the plug-and-play modular fixture to adjust the parameter variables of the machine to the predefined specifications of the workpiece when the real-time data is not accurate.


Arun Kumar R.,PSG College of Technology
Journal of Chemistry | Year: 2013

The development of borate-based single crystals for laser and frequency conversion applications is reviewed. The basic idea behind nonlinear optics and the role of anionic groups in the borate crystals are summarized. The properties of borate crystalsBBO, LBO, CBO, KBBF, SBBO, CLBO, YCOB, GdCOB, GdYCOB, KAB and LCBare discussed. The growth and characterization of several rare earth-based borate crystals are mainly focused. Several borate crystals are grown from the melt techniques and a few crystals are grown adopting the flux technique. Many rare earth-based borate crystals are extensively used in device applications as they exhibit the frequency conversion ability along with high laser-induced damage tolerance. © 2013 R. Arun Kumar.

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