Motilal Nehru National Institute of Technology Allahabad

About: Motilal Nehru National Institute of Technology Allahabad is a education organization based out in Allahabad, Uttar Pradesh, India. It is known for research contribution in the topics: Control theory & Electric power system. The organization has 2475 authors who have published 5067 publications receiving 61891 citations. The organization is also known as: NIT Allahabad & Motilal Nehru Regional Engineering College.

Investigation to Study the Applicability of Solid Lubricant in Turning AISI 1040 steel

Abstract: Recent developments in different methods of machining have significantly increased the potential for widespread industrial applications of turning. Although a high surface quality had been achieved in earlier investigations 1‐3, widespread industrial applications of turning technology necessitated a better understanding of the effects of process parameters on surface quality. The surface quality of machined parts is affected by many factors, such as tool geometry and cutting conditions. It is generally considered that the heat produced during the turning process is critical in terms of workpiece quality. Relatively high friction effects in machining cause heat generation that can lead to poor surface quality of a machined part. Coolant and lubrication therefore play decisive roles in machining. Cutting fluids are introduced in the machining zone to improve the tribological characteristics of machining processes and also to dissipate the heat generated. However, the application of conventional cutting fluids creates some techno-environmental problems, such as environmental pollution, biological problems to operators, water pollution, etc. 4. Further, the cutting fluids also incur a major portion of the total manufacturing cost 5. All these factors prompt investigations on the use of biodegradable cutting fluids or the elimination of the use of cutting fluids. However, any attempt to minimize or avoid the coolant can be dealt with only by replacing the functions normally met by the coolants with some other means. Machining with solid lubricants 6 and cryogenic coolants by liquid nitrogen 7 are some of the alternative approaches in this direction. Application of solid lubricant in machining has proved to be a feasible alternative to fluid coolants, if it can be applied properly. If friction at the tool and workpiece interaction can be minimized by providing effective lubrication, the heat generated can be reduced to some extent. Advancement in modern tribology has identified many solid lubricants, which can sustain and provide lubricity over a wide range of temperatures. If suitable lubricant can be successfully applied in the machining zone, it leads to process improvement. The feasibility of application of graphite as a solid lubricant in surface grinding was investigated by applying it in a suitable paste form to the working surface of the wheel, with a special attachment 8. The effective role of graphite as solid lubricant was evident from the process results related to frictional factors. However, wheel clogging in the absence of proper flushing and nonuniformity of lubricant admission were found to be major hindrances in achieving desirable results. If lubricant can be applied in a more refined and defined way, just sufficient for effective lubrication, improved process results may be expected. Therefore, the aim of present study is to investigate the effect of molybdenum disulphide as solid lubricant in the zone of machining. In the first stage of this work, experiments were carried out to investigate the role of solid lubricant such as molybdenum disulphide on surface finish and chip thickness of the product in machining a AISI 1040 steel by uncoated cemented carbide inserts of different tool geometry approach angle and rake angle under different cutting speeds and feeds. An experimental setup was envisaged and built. In the second stage, a comparative performance analysis of molybdenum disulphide assisted machining with wet machining was conducted. 2 Design and Development of Experimental Setup

Evaluating effectiveness of a training programme with trainee reaction

Abstract: Purpose – This paper aims to deal with evaluation of different parameters of an induction programme conducted by a transmission and distribution major in India. The study aims to indicate which aspects of the training programme need to be emphasised when devising induction programmes for managers and non‐managers, and to ascertain whether there is any significant difference in their reactions.Design/methodology/approach – Evaluation has been done with the help of trainee reaction measured by a questionnaire. The statistical tools used include factor analysis to generate factors that influence trainee satisfaction and a t‐test to test the hypothesis that there will be a significant difference between managerial and non‐managerial levels in their satisfaction with different aspects of the programme.Findings – Factor analysis generated six factors, namely clarity of trainer, other facilities, venue of the programme, food served, practical application, and communication of trainer. The t‐test run on these fac...

Unbalance Voltage Sag Fault-Type Characterization Algorithm for Recorded Waveform

Abstract: This paper presents a new algorithm, namely, a three-phase-angle algorithm, for accurate characterization of three-phase unbalanced voltage sags, associated with line-to-line and single-line-to-ground faults, from recorded voltage waveforms. This new algorithm uses the relation between the angles of three-phase voltages and the angle of characteristic voltage. The performance of the proposed algorithm is evaluated by considering numerical examples and recorded voltage waveforms available with the IEEE database. A thorough comparison of the results, obtained using the proposed algorithm and other existing algorithms, is made to demonstrate its efficiency. The results suggest that the proposed algorithm is advantageous in accurate characterization of voltage sags in two ways. First, it is proficient under large/small phase-angle jump as well as for solidly and resistance-grounded systems. Second, it is capable of extracting the information about faults, associated with voltage sags.