Kumar A.,Mmuniversity |
Kumar V.,Thapar University |
Kumar J.,National Institute of Technology Kurukshetra
Advances in Materials Science and Engineering | Year: 2013
This research work mainly focused on experimental investigation on material transfer mechanism in WEDM of pure titanium. The effects of machining parameters such as pulse on time, pulse off time, peak current, spark gap voltage, wire feed, and wire tension on the material removal rate (MRR), overcut, and surface roughness for pure titanium in WEDM process were explored. The selected machined samples were analyzed using energy dispersive X-ray analysis, scanning electron microscope, and X-ray diffraction techniques. It was observed from the results that a significant material transfer occurred from the dielectric, as well as tool, electrode on the work surface either in free form and/or in compound form. Also the multiresponse optimization of process parameters was done using desirability approach. The predictions from this model were validated by conducting experiments. © 2013 Anish Kumar et al.
International Journal of Applied Engineering Research | Year: 2012
Just in time (JIT) is a production strategy that strives to improve a business return on investment by reducing inprocess inventory and associated carrying costs. To meet JIT objectives, the process relies on signals or Kanban between different points in the process, which tell production when to make the next part. Kanban are usually 'tickets' but can be simple visual signals, such as the presence or absence of a part on a shelf. Implemented correctly, JIT focuses on continuous improvement and can improve a manufacturing organization's return on investment, quality, and efficiency. To achieve continuous improvement key areas of focus could be flow, employee involvement and quality. Quick notice that stock depletion requires personnel to order new stock is critical to the inventory reduction at the center of JIT, which saves warehouse space and costs, but JIT relies on other elements in the inventory chain: for instance, its effective application cannot be independent of other key components of a lean manufacturing system or it can end up with the opposite of the desired result. In recent years manufacturers have continued to try to hone forecasting methods such as applying a trailing 13-week average as a better predictor for JIT planning; however, some research demonstrates that basing JIT on the presumption of stability is Flawed. © Research India Publications.
International Journal of Vehicle Structures and Systems | Year: 2013
This research paper determines the eigenvalues of main rigid bodies i.e. car body, bolsters, bogie frames and wheel axles of a 37 DoF coupled vertical-lateral model of a General Sleeper ICF coach of Indian Railway formulated using Lagrangian dynamics. The primary and secondary hunting speeds of the railway vehicle are determined to investigate the dynamic stability. Critical parameters which influence the railway vehicle dynamic stability are analysed. © 2013. MechAero Foundation for Technical Research & Education Excellence.
Singh C.,Punjabi University |
Image and Vision Computing | Year: 2011
Accuracy, speed and numerical stability are among the major factors restricting the use of Zernike moments (ZMs) in numerous commercial applications where they are a tool of significant utility. Often these factors are conflicting in nature. The direct formulation of ZMs is prone to numerical integration error while in the recent past many fast algorithms are developed for its computation. On the other hand, the relationship between geometric moments (GMs) and ZMs reduces numerical integration error but it is observed to be computation intensive. We propose fast algorithms for both the formulations. In the proposed method, the order of time complexity for GMs-to-ZMs formulation is reduced and further enhancement in speed is achieved by using quasi-symmetry property of GMs. The existing q-recursive method for direct formulation is further modified by incorporating the recursive steps for the computation of trigonometric functions. We also observe that q-recursive method provides numerical stability caused by finite precision arithmetic at high orders of moment which is hitherto not reported in the literature. Experimental results on images of different sizes support our claim. © 2010 Elsevier B.V. All rights reserved.
Prabha C.,Mm University |
Kumar S.,GTB College |
Procedia Computer Science | Year: 2016
The role of opportunistic networks can be crucial in data transmission. Here message forwarding depends solely on node co-operation. Opportunistic networks use store-and-carry forward mechanism. The frequent disconnection of nodes is very common in these networks because of dynamic nature of mobile nodes. Therefore use of suitable routing protocol is very important in message delivery. In this paper, three social context aware routing protocols that support message forwarding in opportunistic networks i.e. HiBop, Propicman and CAOR are analysed in terms of performance metrics viz. delivery probability, overhead ratio, number of hops and delay. The results show that CAOR outperform the other two protocols in all these aspects. The delivery probability of CAOR is higher whereas the overhead ratio, number of hops and delay are less than those for HiBop and Propicman routing protocols. © 2016 The Authors. Published by Elsevier B.V.