GNDEC Ludhiana


GNDEC Ludhiana

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Chhabra M.,MIT Moradabad | Singh R.,GNDEC Ludhiana
Transactions of the Indian Institute of Metals | Year: 2017

ZCast direct metal casting process is one of the important techniques of additive manufacturing which is used for printing the shell moulds for casting of non-ferrous materials. In the present work, an attempt was made to experimentally investigate the effect of different control factors on the hardness of castings produced using this ZCast process. Taguchi’s design of experimental method was used to perform the experimentation. Aluminium, brass and copper alloy castings were obtained in three different sizes using 3D printed shell moulds of different wall thicknesses. The obtained results were analysed using signal-to-noise ratio and analysis-of-variance. Analysis showed that the hardness depended on the casting material and 3D printed shell mould wall thickness. Cooling curve analysis and microstructure analysis of casting obtained with mould of different thickness were also performed. Paper revealed the potential suitability of copper, brass and aluminium for producing casting using ZCast process. The present research could provide valuable data of hardness of rapid castings of different material and might confirm the effectiveness and applicability of ZCast process in foundry industry. © 2017 The Indian Institute of Metals - IIM

Boparai K.S.,MRRSPTU Bathinda | Singh R.,GNDEC Ludhiana | Fabbrocino F.,University of Trento | Fraternali F.,University of Salerno
Composites Part B: Engineering | Year: 2016

This work is focused on the thermal characterization of Nylon 6 based nano-composite (NC) material. Initially, melt flow index (MFI) test confirms the qualification of this material, as an alternative material for the fabrication of FDM filament. The differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA) measurements characterize the material by recording their phase and mass changes as a function of temperature. The DSC results confirmed the decrease of crystallinity with the inclusion of nano fillers but also realized that these filler particles act as a thermodynamic sink and improves its stability. The TGA analysis also demonstrated the increase in thermal stability and flame retardancy level of NC material. In addition to above scanning electron microscopy analysis visualized the dispersion of filler materials in Nylon 6 matrix. © 2016 Elsevier Ltd

Singh R.,GNDU Amritsar | Singh M.L.,GNDU Amritsar | Kaur B.,GNDEC Ludhiana
Optik | Year: 2012

Thulium doped fiber amplifier is a good candidate for S, and S+ band. This paper demonstrated a three pump pumping scheme for thulium doped fiber amplifier with 1050 nm co propagating pump and 1400 nm and 800 nm counter propagating pumps with a total pumping power 600 mW. This configuration yields up to 33 dB gain in 20 nm region from 1460 nm to 1480 nm, with noise figure <4 dB. To the knowledge of authors it is the highest gain achieved by thulium-doped amplifier in a single pass configuration with good power conversion efficiency. © 2012 Elsevier GmbH. All rights reserved.

Kaur K.,LLRIET Moga | Sharma A.S.,GNDEC Ludhiana | Sohal H.S.,LLRIET Moga | Kaur A.,LLRIET Moga
2015 2nd International Conference on Recent Advances in Engineering and Computational Sciences, RAECS 2015 | Year: 2015

Long Term Evolution (LTE) networks are getting popular every year and adding more number of users to the networks. The LTE networks offer very high transmission throughput albeit, which also attracts the hackers to the networks. The primary security has to be provided in order to prevent the attacks during the initial set up phase as well during the other network transactions. Adaptive Random Key Scheme for Authentication and Key Agreement (ARKS-AKA) is presented in this paper for efficient LTE security. ARKS-AKA is intended to reduce the delay time for the voice data delivery. The proposed model diminishes the LTE call drops due to the false positive key matching transactions. ARKS-AKA offers the lightweight key management scheme with double layer encryption contrasted with the existing model termed as Efficient Extensible Authentication Protocol-Authentication and Key Agreement (EEPS-AKA). The simulation results proved the effectiveness of the proposed model. © 2015 IEEE.

In the present work, a comparison of the tribological properties of Nylon6-Al-Al2O3 and ABS parts fabricated using the fused deposition modelling (FDM) method is made. Under dry sliding conditions at room temperature, the sliding wear behaviour of FDM-built parts with three different proportions of Al and Al2O3 was investigated. Loads of 5, 10, 15 and 20 were applied at a sliding velocity of 1.36 m/s for durations of 5 and 10 minutes. The results show that all FDM-built Nylon6-Al-Al2O3 components have better wear resistance as compared to their FDM-built ABS counterparts. Further, the influences of filler materials on various wear mechanisms such as adhesion, abrasion, etc. are identified. It was also observed that the composite materials prepared with different proportions are more wear resistant, having less friction coefficients and friction force than the commercially used ABS material for FDM components. © 2015 Taylor & Francis.

Boparai K.S.,RIMT IET Mandi Gobindgarh | Singh R.,GNDEC Ludhiana
Applied Mechanics and Materials | Year: 2013

The purpose of the present investigations is to study the effect of vacuum moulding (VM) process parameters (namely: chemical composition, component volume and vacuum pressure) for development of statistically controlled Al-SiC MMC. Starting from the identification of component/benchmark, technological prototypes were prepared by VM process for functional validation of the parts. The study suggested the long-term performance level of the VM process after it has been brought under statistical control as casting solution for Al-SiC MMC. The provided data from the experimentation highlights the ability of the VM process to produce a product that will consistently meet the design requirements and the customer expectation. © (2013) Trans Tech Publications, Switzerland.

Sadioura A.S.,RIMT IET Mandi Gobindgarh | Singh R.,GNDEC Ludhiana | Singh H.,GNDEC Ludhiana
Applied Mechanics and Materials | Year: 2013

The selection of carbide insert on the basis of performance measuring parameters is amulti-attribute decision making problem. This proposed work demonstrates a methodology to evaluate the machinability of the selected turning operation by using graph theory and matrix methods. The qualitative values of attributes are obtained by measuring the process attributes. The fuzzy score has been used to convert intangible factors to crisp scores and then graph theoretic approach has been applied to calculate the single numerical machinability index for ranking among the insert alternatives. Permanent function matrix has been solved by using computer software. This study, in particular, shows the potentiality of graph theory and matrix approach for the analysis, evaluation and selection of carbide insert for machining process. A hybrid decision making method of graph theory and matrix approach (GTMA) and analytical hierarchy process (AHP) is proposed to solve multi decision making problem. The result of study highlights the ranking of inserts based upon machinability index. © (2013) Trans Tech Publications, Switzerland.

Butt W.A.,GNDEC Ludhiana | Mir B.A.,National Institute of Technology Srinagar | Jha J.N.,GNDEC Ludhiana
Geotechnical and Geological Engineering | Year: 2016

There are various ground improvement techniques available, soil reinforcement technique has been successfully used in recent times to improve the shear parameters of the marginal/weak soils. Among various reinforcing materials, human hair fiber (HHF) can be used as a natural fiber to enhance the shear strength and bearing capacity of a clayey soil for sustainable use of waste material and sustainable development of infrastructures in a rapid urbanization. Human hair fiber is a natural non-degradable waste material, which creates health and environmental problem if not disposed-off in scientific manner. This is available in abundance at a very low cost and can be easily used as a reinforcing material not only to improve poor/unsuitable construction sites for sustainable construction but also to avoid its disposal problems. Therefore, this paper presents some studies on strength properties of clayey soil reinforced with HHF. The HHF randomly distributed in clayey soil samples were tested for its engineering properties by performing CBR and tri-axial test on a number of samples by using the different percentage of fibres and comparing the results with the non-reinforced soil. Fibres of average length 25 mm and average diameter of 50 µm were used. The test result revealed that the strength significantly improves with the inclusion of HHF and also prevents the sample from cracking. © 2015, Springer International Publishing Switzerland.

Mehan V.,National Institute of Technology Jalandhar | Dhir R.,National Institute of Technology Jalandhar | Brar Y.S.,GNDEC Ludhiana
2013 IEEE International Conference on Signal Processing, Computing and Control, ISPCC 2013 | Year: 2013

Digital watermarking has developed immensely for multimedia uses in the current decade. The requirement for protected digital content grows vital with the enhancement in exchange of digital images on internet. Watermarking is a technique to safeguard digital media by retaining the owner's possession. Fingerprinting extends the watermarking concept by embedding unique purchaser's information. This paper presents a joint digital watermarking and fingerprinting approach for colored digital images applied in double DCT domain. The approach aims at copyright protection and traitor identification of digital images. Altered mid-frequency coefficients are analyzed by applying forward DCT transform. Watermark and fingerprint are embedded in a non-overlying manner. Second DCT allows for the precise determination of the block, for embedding data. The double domain can enhance the embedding capacity of the host image by choosing more than one coefficients in a given block. Simulation outcomes reveal that the watermark is immune to JPEG compression, additive noise and median filtering. Quality of the image is retained, as the results reveal a Peak Signal to Noise Ratio (PSNR) in range of 58-73 dB. © 2013 IEEE.

Garg H.,MRRSSTU Bathinda | Singh R.,GNDEC Ludhiana
Transactions of the Indian Institute of Metals | Year: 2016

The present research work highlights the fabrication of Fe-nylon6 composite wire by varying proportion of Fe in nylon6 matrix (by weight) along with wear and friction characteristics of the composite wire. The composite wire prepared has been used as a feedstock filament in place of the existing ABS material in the fused deposition modelling (FDM) machine (without any software and hardware modifications in the existing FDM setup). Comparison of wear of three different Fe-nylon6 compositions and ABS at varying loads along with the variation of coefficient of friction and the frictional force has been carried out. The objective is to study the variation of wear and friction characteristics with the variation of the filler material (Fe) in the composite. It is concluded that all the three composite materials are highly wear resistant, having less friction coefficient, less frictional force than the recommended material (ABS) for FDM system. The surface morphology shows even distribution of Fe particles in the matrix which increases with the increase in percentage of Fe in the composite. © 2016 The Indian Institute of Metals - IIM

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