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Shetty C.,National Institute of Technology Karnataka | Kadle A.,Anjuman Institute of Technology and Management
IET Conference Publications | Year: 2013

In this paper, we present the significance of computer simulation program, such as ORCAD PSPICE, in analyzing, first order approximations of circuit behavior, a closed loop, non-isolated dc-dc converter with synchronous rectifier circuit. Following techniques have been adopted to simplify the process of simulation. They are: (1) Ideal switches are incorporated in the power stage of the converter to eliminate the gate diver requirement which in turn reduces the simulation run time; (2) Diodes are connected in series with switches, which eliminates dead time control circuit, to prevent cross conduction of switches and (3) TL494 Pspice model, which is readily available in library of most of the versions of the ORCAD PSPICE, is employed for pulse width modulation. As an example, non-inverting synchronous buck boost converter is considered for demonstrating the approach. Simulation was carried out for an input voltage range of 6 to 35V and load resistance was varied from 12 to 48 Ohms. Output voltage was regulated at 12V for both input voltage and load current perturbation. Physical prototype was implemented and simulation result was tested for steady state output.

Shetty C.,National Institute of Technology Karnataka | Kadle A.,Anjuman Institute of Technology and Management
IET Conference Publications | Year: 2013

This paper describes the application of TL494 PSPICE MODEL with OrCAD Capture for analyzing switching regulators, which can assist beginners like undergraduate students in understanding the switching regulators. This paper mainly focuses on application of simulation model as none of the literatures provides required information to work with TL494 simulation model. Although TL494 chip is a very simple chip as far as hardware is concerned, it is not easy work with Pspice model of TL494 without adequate knowledge about the Pspice software. The application of this chip's simulation model with OrCAD Capture is demonstrated with the help of buck converter. This application report can also be extended to other non-isolated as well as isolated converters.

Karjinni V.V.,Sanjay Ghodawat Group Ofinstitutions | Bhavikatti M.A.,Anjuman Institute of Technology and Management
Indian Concrete Journal | Year: 2012

This paper reports the effect of curing methods on the compressive strength of Pavement Quality Concrete (PQC), produced with both Portland Pozzolana Cement (PPC) and Portland Slag Cement (PSC). Concrete mixtures were designed following the revised guidelines given by IS 10262: 2009. A non-chloride hardening accelerator was used for early strength- gain. Slump test for fresh concrete and cube compressive strength for hardened concrete were the measurements carried to evaluate the specimens cured with water and alternatively with a wax based membrane type curing compound. The results suggest that the curing methods did not affect the accelerator's optimum performance which was observed at two day in the case of the pozzolana cement mixtures. However, they did so in the case of slag cement mixtures. The average curing compound efficiency for pozzolana cement mixtures was found to be more than that for the slag cement mixtures. The curing efficiency was more at early ages.

Kurahatti R.V.,Basaveshwar Engineering College | Surendranathan A.O.,National Institute of Technology Karnataka | Mordina B.,Defence Materials and Stores Research and Development Organization | Naik P.,Anjuman Institute of Technology and Management | Auradi V.,Siddaganga Institute of Technology
Tribology - Materials, Surfaces and Interfaces | Year: 2016

Three types of bismaleimide–carbon nanotubes (CNTs) nanocomposites were fabricated using two types of original multiwalled CNTs with different diameters and one amide functionalized CNTs. The influence of diameter, content and functionalization of CNTs on the flexural and dry sliding wear behaviour were measured with universal testing machine and pin-on-disc wear apparatus. The experimental results indicated that at 1.5 wt-%, the bismaleimide-functionalized MWCNTs exhibited highest flexural strength of 156 MPa which is increased by 164% as compared to the neat matrix, and lowest specific wear rate of 1.8 × 10−4 mm3 N−1 m−1 which is decreased by 90% as compared to the neat matrix. This was attributed to the dispersion of CNTs in the matrix and the filler-matrix adhesion and internal strength of the composite. © 2016 Informa UK Limited, trading as Taylor & Francis Group

Prasanna H.U.,Anjuman Institute of Technology and Management | Udupa K.R.,National Institute of Technology Karnataka
Nuclear Engineering and Design | Year: 2011

Authors have probed into the creep behaviour of AISI 316L stainless steel welds through the indentation creep test methodology and assessed the deterioration effects of these welds under different ageing conditions subjecting them to different test conditions. Comparison is made between the parent metal and the weld metal for integrity at different levels of ageing and test loads. It is concluded that although the aged weld's deteriorated status is not revealed at low temperature and low load test conditions, it is explicitly revealed when tested at higher temperature and higher loads. Microstructural evidences have been given by the authors and they have suggested mechanisms of creep at different test conditions. © 2011 Elsevier B.V. All rights reserved.

Udaya Prasanna H.,Anjuman Institute of Technology and Management | Rajendra Udupa K.,National Institute of Technology Karnataka
Procedia Engineering | Year: 2013

The phenomenon of dynamic strain ageing (DSA) is known to be prevalent in many of the iron and nickel based alloys which are mainly used as materials for nuclear power plant parts. This behaviour of the material is revealed as a jerky flow phenomenon in the tensile test results, when tests are performed at particular strain rate ranges. Authors probe into this aspect of the behaviour of AISI 316L stainless steel through the indentation creep test route so as to find out the implication of DSA on indentation creep test results. The occurrence of DSA is confirmed by the authors by compression tests carried out on samples of 316L with different loads at set strain rates. The authors attempt to find the evidence for DSA through creep data obtained from the indentation creep tests. Their findings reinforce the theory that there is a limiting stress above which the applied stress should pull the dislocations away from the solute atmosphere. © 2013 The Authors.

Yusoff H.,Universiti Sains Malaysia | Abdullah M.Z.,Universiti Sains Malaysia | Abdul Mujeebu M.,University Putra Malaysia | Ahmad K.A.,Anjuman Institute of Technology and Management
Experimental Techniques | Year: 2015

As part of the ongoing research on micro air vehicles, the present work focuses on the effect of membrane flexibility on the aerodynamic performance of flexible latex flapping wings. Wings with membrane thicknesses 0.37, 0.28, and 0.13 mm are chosen, which are named as least flexible (A), flexible (B), and most flexible (C), respectively. The experiments are performed in an air chamber of size 1.5 m × 1.5 m × 1.5 m, facilitated with wind velocities up to 15 m/s. The time-averaged lift and drag as functions of flapping frequency, forward flight velocity, the angles of attack (AoA), and advance ratio (J). The novel electronic control system developed previously is used to monitor and measure the flapping frequency. It is found that the effect of flexibility on the aerodynamic performance mainly depends on the range of flight speed; at 7200 ≤ Re ≤ 18,000, the lift and drag increase with increase of flexibility, and at 18,000 ≤ Re ≤ 25,200, the lift decreases and drag increases with increase of flexibility. Hence latex compliant (Wing C) wings are advantageous in the low Re range, while the least flexible wing (Wing A) is preferable for higher range. © 2012, Society for Experimental Mechanics.

Prasanna H.U.,Anjuman Institute of Technology and Management | Udupa K.R.,National Institute of Technology Karnataka
Australian Journal of Mechanical Engineering | Year: 2016

Size being limited for preparing standard specimens for mechanical tests, the weld poses problems to researchers and scientists in estimating the strength parameters and workhardening coefficients. The integrity of the weld is difficult to probe into, particularly when the temperature of operation is much higher than the room temperature. The indentation creep test route is successfully tried by the authors to present a detailed commentary on the mechanical properties of a stainless steel weld at different test temperatures using a methodology whereby the creep test results are correlated to the compression test results and correlation equations developed. As the indentation creep tests can be carried out on a small-sized sample, the method enables one to carry out only this test to judge the mechanical properties of the welds. © 2015 Engineers Australia.

Abdul Mujeebu M.,Universiti Sains Malaysia | Abdul Mujeebu M.,Anjuman Institute of Technology and Management | Abdullah M.Z.,Universiti Sains Malaysia | Zuber M.,Universiti Sains Malaysia
Isi Bilimi Ve Teknigi Dergisi/ Journal of Thermal Science and Technology | Year: 2013

This paper presents the development, charcterization and numerical simulation of compact premixed LPG burner based on surface combustion in porous inert medium. The preheating and reaction zones are made up of Alumina (Al 2O3) foams of pore sizes 26 ppcm and 8 ppcm, respectively. Experiments are conducted with 0.45 litres per minute (lpm) of LPG fuel, which is found to be the minimum quantity required to produce a sustainable flame when mixed with 4 lpm of air. The temperature distribution within the combustor, flame stability, maximum flame temperature, NO, CO and SO2 emissions and thermal efficiency are measured and compared with those of conventional LPG stove. It is found that the proposed burner could yield 80% saving in fuel consumption and 75% reduction in NOx emission compared to the conventional one. The CO and SO2 emissions are also within the permissible limits. The thermal efficiency is estimated to be 71% whereas for the conventional burner is 47%, for a thermal load of 0.62 kW. Effects of porosity and thickness of reaction layer are studied by means of a two dimensional simulation using FLUENT software, considering single step reaction and thermal equilibrium between phases. Experimental and numerical findings are found in satisfactory agreement. © 2013 TIBTD Printed in Turkey.

Khor C.Y.,Universiti Sains Malaysia | Abdullah M.Z.,Universiti Sains Malaysia | Abdul Mujeebu M.,Anjuman Institute of Technology and Management
Journal of Electronic Packaging, Transactions of the ASME | Year: 2012

In this paper, the finite volume method (FVM) is used for the simulation of flip chip underfill process by considering non-Newtonian flow between two parallel plates that emulate the silicon die and the substrate. 3D model of two parallel plates of size 12.75 mm × 9.5 mm with gap heights of 5 μm, 15 μm, 25 μm, 35 μm, 45 μm, and 85 μm are developed and simulated by computational fluid dynamic (CFD) code, FLUENT 6.3.26. The flow is modeled by using power law model and volume of fluid (VOF) technique is applied for flow front tracking. The effect of change in height of the gap between the plates on the underfill process is mainly studied in the present work. It is observed that the gap height has significant influence on the melt filling time and pressure drop, as the gap height decreases filling time and pressure drop increase. The simulation results are compared with previous experimental results and found in good conformity. © 2012 American Society of Mechanical Engineers.

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