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Rajan K.,Vel Technology
Journal of Theoretical and Applied Information Technology | Year: 2014

This article presents the design of hybrid controller (proportional double integral controller (PDIC) plus fuzzy logic controller (FLC)) in load frequency control (LFC) for multi area hydro thermal system (MAHTS). In this case, two control areas connected through the tie line and each area consists of both the hydro and thermal power system. The conventional controllers are incapable of stabilizing the frequency deviation as well as the power oscillation of it at load variations conditions. In order to stabilize the frequency deviation and improve the dynamic performance of MAHTS, a PDIC plus FLC is developed. The complete model with various controllers is implemented in MATLAB/Simulink. The performance of designed controller is validated at various operating state in comparison with a conventional controllers. The simulation results are indicated that the designed controller more superior than the conventional controllers. © 2005 - 2014 JATIT & LLS. All rights reserved.


Chandramohan D.,Vel Technology | Rajesh S.,Jeppiaar Engineering College
Academic Journal of Manufacturing Engineering | Year: 2014

Increased environmental awareness and consciousness throughout the world has developed an increasing interest in natural fibers and its applications in various fields. The aim of research is to make use of natural fiber abundantly available in India. An effort to utilize the advantages offered by renewable resources for the development of biocomposite materials based on biopolymers and natural fibers has been made through fabrication of Natural fiber powdered material (Sisal (Agave sisalana), Banana (Musa sepientum), and Roselle (Hibiscus sabdariffa)) reinforced polymer composite material by using bio epoxy resin. The present work focuses on the prediction of thrust force and torque of the natural fiber reinforced polymer composite materials, and the values, compared with the Artificial Neural Network. © 2014, Academic Association for Manufacturing Engineering. All rights reserved.


Chandramohan D.,Vel Technology | Rajesh S.,Jeppiaar Engineering College
International Journal of Applied Engineering Research | Year: 2014

This research aims to attainment two essential purposes: first, using of inorganic fire retardant which represent zinc borate to increase the flame retardancy for advanced composite material consist of araldite resin (AY103) reinforced by hybrid fibers from carbon and Kevlar fibers as a woven roving (0 °-45°), by using a surface layer from zinc borate as a coating layer of (4mm) thickness. Then, this system was exposed to a direct flame generated from Oxyacetylene torch (3000°C) with different flame exposure distances [10, 15, 20mm], and study the range of resistance of retardant material layer to the flames and protected the substrate. Second, forming a hybrid fire retardant by added antimony trioxide with various amount (10%, 20%, 30%) to zinc borate for enhance the action of this material to react flame and exposure this hybrid material to same flame temperature and exposure distances. Method of measuring the surface temperature opposite to the flame was used to determined the heat transferred to composite material. The best results was obtained with large exposed distance and large percentage from protective layer which is zinc borate with (30%) antimony trioxide. © Research India Publications.


Chandramohan D.,Vel Technology | Murali B.,Vel Technology
Academic Journal of Manufacturing Engineering | Year: 2014

Composites are materials widely used in many goods and components due to their superior properties. The machining of these materials is inevitable although they are manufactured to near net shape. This becomes more important when new product designs and shapes pose tougher dimensional and performance constraints like surface finish, dimensional tolerances & material removal rate etc. Thus many researchers in the past have attempted to study machining of composite materials to know the effect of various process parameters on the quality of machining characteristics. In this paper an attempt has been made to review the work of some researchers who conducted experimental studies on machining of composite material. Literature review reveals that current research focuses on nontraditional machining of metal matrix and ceramic matrix composites and also on traditional machining of glass fiber reinforced plastics and carbon fiber reinforced plastics to reduce or eliminate the problem of delaminating. © 2014, Academic Association for Manufacturing Engineering. All rights reserved.


Chandramohan D.,Vel Technology | Senthilathiban A.,Apollo Engineering College
International Journal of Applied Chemistry | Year: 2014

Jute fiber reinforced low density polyethylene (LDPE) composites (10-30% fiber, by weight) are prepared by compression molding. Tensile strength (TS), bending strength (BS) and bending elongation (BE) of the composites are increased over LDPE. Jute fiber is treated with monomer (2-hydroxyethyl methacrylate, HEMA) along with two different initiators in methanol solvent. Jute fibers are soaked with 10% HEMA+2% Irgacure-184 (F1-Formulation) and 3% HEMA+2% benzol peroxide (F2-Formulation) and dried at 80°C for 2 hours then composites are fabricated by compression molding. It is found that due to chemical treatment of the jute fibers, a significant improvement of the mechanical properties of the composites are happened (56% TS, 30% BS and 35% BE) compared to the LDPE. 3%HEMA+2% benzol peroxide treated jute composites found better mechanical properties compared to 10%HEMA+2% Irgacure-184 treated jute composites. Dielectric constant and loss tangent of the composites are increased with increasing temperature up to a transition temperature and then decreased, finally reached to plateau. © Research India Publications.


MuthuManokar A.,Vel Technology
Journal of Chemical and Pharmaceutical Sciences | Year: 2014

Scarcity for water exists in many countries even though three fourth of the earth is covered by water. This is due to the rapid growth of industries and the immeasurable population of the world. Solar still is the efficient solution to solve water problem in areas of dry weather where there is scarcity of water and electricity. Solar still is a very simple solar device that is used for converting the available brackish water into potable water. This paper presents a new approach to enhance the chemical reaction and the productivity by the use of titanium dioxide as photo-catalyst. Using titanium dioxide, TiO2 as photo-catalyst, the process was successfully degraded and reduces the organic pollutant and microorganisms in wastewater. It is non-toxicity, photo-chemically unwavering and highly reactive. Otherwise, the catalyst itself is inexpensive and commercially available in various crystalline forms. The daily productivity of single basin single slope solar still without the use of photo-catalysis was 615 ML/0.25M2/day and with the use of photo-catalysis was 670 ML/0.25M2/day.


Muniamuthu S.,Vel Technology | Raju R.,Anna University
International Journal of Applied Engineering Research | Year: 2014

The use of Video Display Terminal (VDT) is widespread and beneficial for improvement of work quality and productivity. Musculoskeletal symptoms or disorders in the upper extremities and neck among employees working at video display terminal workstations has been a topic in occupational health research for many years. This study has developed a MSD prevalence model suitable for computer workplaces in India. A total of about 600 questionnaires were distributed to the VDT users of production, software and service industries. Out of total 600 questionnaires distributed, 427 were collected with the response rate of 71.16% of the respondents. Out of 427, only 410 samples were found to contain complete information and so were valid for analysis. To check whether qualification of computer users play a significant role on the perception level of the Musculoskeletal Disorder(MSD) causing risk variables, MSD prevalence level and Job Prevention, a hypothesis H1 was framed and tested. One way ANOVA has been conducted and the result shows that the Equipment Setup and the Assumed Posture are found significant for VDT users with different qualifications and Diploma qualified VDT users are satisfied with the existing Equipment Setup and alter the body posture in better manner than the remaining qualification groups. © Research India Publications.


Vidhya K.,Vel Technology
Journal of Electrical Engineering and Technology | Year: 2016

Medical imaging techniques such as Magnetic Resonance Imaging (MRI), Computed Tomography (CT) and Ultrasound (US) produce a large amount of digital medical images. Hence, compression of digital images becomes essential and is very much desired in medical applications to solve both storage and transmission problems. But at the same time, an efficient image compression scheme that reduces the size of medical images without sacrificing diagnostic information is required. This paper proposes a novel threshold-based medical image compression algorithm to reduce the size of the medical image without degradation in the diagnostic information. This algorithm discusses a novel type of thresholding to maximize Compression Ratio (CR) without sacrificing diagnostic information. The compression algorithm is designed to get image with high optimum compression efficiency and also with high fidelity, especially for Peak Signal to Noise Ratio (PSNR) greater than or equal to 36 dB. This value of PSNR is chosen because it has been suggested by previous researchers that medical images, if have PSNR from 30 dB to 50 dB, will retain diagnostic information. The compression algorithm utilizes one-level wavelet decomposition with threshold-based coefficient selection. © The Korean Institute of Electrical Engineers.


Garud V.,Vel Technology | Arankalle A.,Vel Technology
SAE Technical Papers | Year: 2014

India is blessed with considerable quantity of titanium based mineral resources accounting to about 20% of the world's availability holding and third largest reserves. The main titanium minerals are ilmenite and rutile available in beach sand deposits in the coastal states like Kerala with production of about 0.6 MT by mining & mineral separation process to provide environmental friendly titanium alloys. Though the major usage of titanium alloys are for aeronautics, defense, space, atomic energy sectors, its usefulness with special properties is yet to be exploited for the Indian automotive sectors. The principle advantages of Titanium alloys for automotive application that can be exploited are - 45% lighter than steel, virtually total resistant to acidic attack, four times more corrosion resistance than stainless steel, high specific strength, good ductility and ease to form by forging and machining operations. However at present, cost of extraction, alloying with other metals, casting and metal forming processes makes it difficult to penetrate in automotive industry. The R & D efforts are essential between academia, research institutes, and industry to make effective utilization of titanium alloys for motorcycles and four wheelers in the country in the future. The paper discusses the possible main application for vehicle exhaust system and powertrain to meet future emission Euro V & above requirement along with its importance as eco-friendly material and 50% lightweight structure to improve fuel economy. The titanium finds application because in Euro V, to meet NOx level of 0.27g/kWh will require EGR rates of 35% at full load and 50% at partial load and for these EGR rates, the compressed air pressure at the outlet is too high for standard materials for high temperature turbo compressor. In addition, the titanium dioxide coatings help to break down high mass flow that is required in commercial applications. It not only accelerates the hydrolysis of HNCO, but also catalyzes urea thermolysis. This approach of use of advanced titanium material will reliably will prevent the formation of solid urea decomposition products in exhaust gas systems. Finite element analysis of connecting rod shows optimization in 1.2% stress and 41.4% weight reduction when using Ti-6Al-4V alloy instead of C-70 splitable steel. The technical paper also discusses possible future potential applications in powertrain compartment, if through R & D efforts cost of material and process is reduced to competitive levels, then it can be used for components like connecting rod, piston assemblies, valves and valve springs, turbocharged wheel, suspension spring, brake line sealing, etc. Copyright © 2014 SAE International.


Maheedhara Reddy G.,Vel Technology | Diwakar Reddy V.,Andhra University
Procedia Engineering | Year: 2014

Dimensional analysis is a very powerful and general tool for use in analysing and understanding problems in engineering and in particular, in mechanics and transport phenomena. The main objective of the present work is to study the characteristics of various bearing parameters under low, medium and high temperatures conditions. Dimensional analysis is useful computing dimensionless parameters and provides answer to what group of parameters that affecting the problem. This Dimensional analysis can be accomplished by using Buckingham π-theorem. Dimensional analysis leads to a reduction of the number of independent parameters involved in a problem. These independent parameters get expressed as dimensionless groups. These dimensionless groups are always ratios of important physical quantities involved in the problem of interest. In modelling and experiment, its main function is to reduce the amount of independent variables, to simplify the solution and to generalize the results thereof. It can become an effective method, especially if a complete mathematical model of the investigated process is not known. The present work also attempts the application of Buckingham pi-theorem to find what parameters are influencing the bearing system and using dimensionless parameters the characteristics are studied. © 2014 Published by Elsevier Ltd.

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