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Debre Zeyit, Ethiopia

Krishna P.,Easwari Engineering College | Babu A.K.,PERI Institute of Technology | Singh A.P.,Defence University | Raj A.A.,Easwari Engineering College
Journal of Engineering Science and Technology | Year: 2015

One of the important goals in diesel engine research is the development of means to reduce the emissions of oxides of nitrogen (NOx) and soot particulates, and in this endeavour advanced techniques like split injection/multiple injection, exhaust gas recirculation (EGR) etc. are being developed. The principle of split injection is that when fuel is injected in two pulses it engenders a reduction in the peak combustion chamber temperature which ensures the reduction in NOx emission. In this study to achieve split injection in an economical manner, a double lobed cam has been designed incorporating the optimum split and dwell. Experimental study indicates that 50-50 split with 10 degree crank angle dwell is the optimum to achieve a viable reduction in NOx without any major penalty in soot and power. A 15% reduction in NOx and 10% reduction in soot was observed on incorporating these results. © School of Engineering, Taylor’s University.

Singh A.P.,Defence University | Yilma M.,Adama Science and Technology University
2013 International Conference on Control, Decision and Information Technologies, CoDIT 2013 | Year: 2013

This paper presents an analysis on a production shop floor layout of a Can manufacturing company and the application of a systematic layout planning (SLP) procedure as an approach to solve the production shop floor layout problem. The relationship between machines, operation activities and material flow are used to determine the optimal location of each machine. SLP technique has been employed to design the two alternative production shop floor layouts and compare the performance between new layout and present layout in terms of material flow distance, traveling time, and traveling cost. The existing production process was inefficient, showing bottlenecks. The alternative layouts were developed based on minimum distance traveled between each pair of machine. It improved the company existing layout by reduced total movement traveled in production for material handling. The measurements covered the actual sizes of the layout and machines, activities between machines, distance between machines, and material flow between machines in the company. The proposed procedure is illustrated to be a viable approach for solving production shop floor layout design problem through a real-world case study. From the proposed two alternative layouts which are more economical, distance of the production flow can be shortened from 389.7m to 311.2m or 360.6m. The traveling time can be reduced from 901sec. to 750sec. and traveling cost can be reduced from 3.17 Birr to 2.98 or 2.19 Birr per each travel resulting increase in productivity. © 2013 IEEE.

Asmelash H.A.,Defence University | Martis R.R.,Indian Defence Institute of Advanced Technology | Singh A.,Terminal Ballistics Research Laboratory TBRL
Aeronautical Journal | Year: 2013

A computational study has been carried out to analyse the shock wave turbulent boundary layer interaction in a two-dimensional compression ramp flow for a free stream Mach number of 2·94. Ramp angles ranging from 8° to 24° are used to produce the full range of possible flow fields, including flows with minor separation, moderate separation, and significant amount of separation. The model has been analysed using 2D numerical simulations based on a commercially available Computational Fluid Dynamics (CFD) Code, Fluent, that employs k-ω Shear Stress Transport (SST) turbulence model. The computed data for surface pressure distribution indicated a good agreement with experiment. Numerical results obtained through the present series of computations indicate an increased extent of separated zone, and thus show increased upstream influence when compared to experiment. Total pressure loss has shown to increase downstream of separation location and increase when corner angle increases. Secondary separation has been observed for higher angles.

Ramadoss S.K.,Eritrea Institute of Technology | Singh A.P.,Defence University | Mohiddin I.K.G.,Eritrea Institute of Technology
OPSEARCH | Year: 2014

An implementation of evolutionary heuristic algorithm, which is a specific modified variant of cultural algorithm, with simplified computational procedure is presented here for solving assignment problems. A cultural algorithm consists a population component almost identical to that of the genetic algorithm and, in addition, a knowledge component called the belief space. The major constraint of assignment problems that a single job can be assigned to only one resource and the resource or job that involves the largest and as well as the least cost are availed as the knowledge components to be used to build belief space. © Operational Research Society of India 2013.

Macko M.,University of Defence at Brno | Ilic S.,Defence University | Jezdimirovic M.,Defence University
Strojniski Vestnik/Journal of Mechanical Engineering | Year: 2012

This article describes a negative effect of size tolerance on the trigger characteristic. The trigger characteristic is the dependence of trigger force and trigger angle. An invalid trigger characteristic affects the accuracy of shooting and can be changed by not only proper choice of dimensions, but also the location of individual components. The paper shows an example of trigger mechanism that is designed as a Glock type mechanism. The solution for designers of small arms authors suggested the use of software MW. © 2012 Journal of Mechanical Engineering. All rights reserved.

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