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Ludhiāna, India

Singh R.,GNDEC | Singh S.,Punjab Technical University
Materials Today: Proceedings | Year: 2015

Investment casting (IC) process, with assistance of rapid prototyping technologies (RPTs), has successfully overcome the problems (such as; long lead time and high tooling costs) for its commercial applications. In the present research work, an effort has been made to investigate statistically controlled solution of fused deposition modelling (FDM) assisted Nylon6-Al-Al2O3replica basedIC process. An alternativeFDM filament with different proportions of Al and Al2O3 reinforced Nylon-6 matrix composite mixture were tested for their compatibility with existing FDM system(prior to the extrusion process). Single screw extruder was used for the development of selected proportions of the composite mixtures in form of FDM filaments. The measurements on final casting prepared were used to calculate the international tolerance (IT) grades to establish the dimensional accuracy of the components. It has been found that the castings produced using Nylon-6 matrix based replicas are acceptable as per international standard organization (ISO) standard UNI-EN-20286-I (1995). Further the microscopic analysis of the castings highlighted the presence of Al2O3 particles in the castings. © 2015 Elsevier Ltd. Source


Singh K.,GNDEC | Padhy N.P.,Indian Institute of Technology Roorkee | Sharma J.,Indian Institute of Technology Roorkee
International Journal of Electrical Power and Energy Systems | Year: 2011

This paper proposes a novel congestion management strategy for a pool based electricity market considering combined operation of hydro and thermal generator companies. The proposed congestion management problem is formulated as mixed binary nonlinear programming problem to minimize the cost of re-dispatching the hydro and thermal generator companies to alleviate congestion subject to operational, line overloading and water availability constraints. A piecewise-linearized unit performance curve is used in this formulation, which takes into account its non-concave nature. The effectiveness of the proposed technique is demonstrated by solving the modified IEEE 57-bus and IEEE 118-bus systems for congestion management under line outages. © 2011 Elsevier Ltd. All rights reserved. Source


Singh H.P.,B.G.I.E.T | Brar Y.S.,GNDEC | Kothari D.P.,J B Group of Insitutions
Proceedings of the 2013 IEEE 8th Conference on Industrial Electronics and Applications, ICIEA 2013 | Year: 2013

Major objective for the Thermal power generation is to minimize fuel consumption by allocating optimal power generation from each unit and to maintain emissions within the environmental license limit subject to equality and inequality constraints. The objectives considered in this paper for minimization i.e. cost and emission are of conflicting nature, therefore weighting method has been applied to convert multiobjective optimization problem to a scalar optimization. The weighting method assigns different weights to each objective function based upon their importance. The Particle Swarm Optimization (PSO) technique has been applied to find the best comprised solution. The equality constraints have been handled by exterior Peñalty method. Fuzzy cardinal approach has been used for the evaluation of the best solution. In order to show the effectiveness, the proposed approach has been tested on three test systems. Numerical results obtained from the proposed approach are compared with different techniques. © 2013 IEEE. Source


Rapid prototyping (RP) is being widely used in diverse areas, from the building of aesthetic and functional prototypes to the production of tools and moulds for prototypes. Many RP techniques like stereo lithography, laminated object manufacturing, three dimensional printing etc. are commercially available. The implication of these technologies revealed that the time and cost of developing new foundry tools could be greatly reduced. The purpose of the present research paper is to review three dimensional printing for generation of prototype for casting applications. © (2010) Trans Tech Publications. Source


Singh R.,GNDEC
Materials Science Forum | Year: 2011

Three dimensional printing (3DP) as rapid casting (RC) solutions has transformed over centuries from black art to science, but the metallurgical impinge on the process responsible for change in mechanical properties (like: surface finish, hardness, dimensional stability etc.) are still disputed. The purpose of the present research paper is to review metallurgical affect of 3DP based RC solution. The result of study suggests that prominent reason found to be responsible for improving the mechanical properties of RC is control of heat transfer rate while solidification (thus reducing dendrite formation). Source

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