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Bhopal, India

Singh B.,University Institute of Technology | Jain S.,MANIT Bhopal
IET Power Electronics

The availability of limited voltage vectors in a conventional direct torque control drive fed from a two-level inverter causes torque and current ripples. In this study, a new torque ripple reduction technique with a modified look up table incorporating a larger number of synthesised non-zero active voltage vectors is proposed to overcome the limitations of the conventional and duty ratio control switching strategies. The voltage vector selection criteria in the proposed technique are based to prevent the stator flux demagnetisation during the low-speed operation with significant reduction in torque and current ripple. The proposed switching strategy is investigated through simulation and experimentally validated on a test drive. Source

Arun P.V.,Maulana Azad National Institute of Technology | Katiyar S.K.,MANIT Bhopal
GIScience and Remote Sensing

Automatic feature extraction has witnessed the use of many intelligent methodologies over the past decade. However, inadequate modelling of feature shape and contextual knowledge has limited the detection accuracy. In this article, we present a framework for accurate feature shape modelling and contextual knowledge representation using advanced techniques such as Vector Machines, Cellular Neural Network (CNN), coreset, and Cellular Automata (CA). CNN was found to be effective in modelling different complex features, and the complexity of the approach was considerably reduced using corset optimization. Spectral and spatial information was dynamically combined using adaptive kernels when representing contextual knowledge. The methodologies were compared with contemporary methods using different statistical measures. Application of the algorithms to satellite images revealed considerable success. The methodology was also effective in providing intelligent interpolation and interpretation of random features. © 2013 Taylor & Francis. Source

Saran S.,Indian Institute of Technology Roorkee | Rangwala H.,MANIT Bhopal
International Journal of Geotechnical Earthquake Engineering

The main objective of the paper is to develop a simplified procedure for the seismic design of a rigid retaining wall. For the design of a rigid retaining wall various parameters that are taken in to consideration include height of the wall, angle of inclination of backfill, backface angle of the wall, surcharge on backfill, safe bearing pressure of base medium and horizontal as well as vertical seismic acceleration coefficients. Safe design of a wall should satisfy four criteria, namely, factor of safety against sliding shall not exceed given limits, factor of safety against overturning shall be less than its permissible value, maximum pressure at the base of wall shall not exceed safe bearing pressure of the base soil and minimum pressure at the base of wall shall be greater than zero. In this paper an attempt has been made to give a simplified procedure for the seismic design of a rigid retaining wall. A parametric study to check the effect of various parameters affecting the seismic design of wall is carried out. Copyright © 2014, IGI Global. Source

Rana R.S.,MANIT Bhopal | Purohit R.,MANIT Bhopal | Sahu K.,CDGI
Materials Today: Proceedings

In the present work an attempt has been made to synthesize metal matrix composite using 6061 Al as matrix material reinforced with nano Al2O3 particulates using liquid metallurgy route particularly squeeze casting technique. The nano composites prepared by varying the Al2O3 from 1-3 weight percent. The reinforcement particles were preheated to a temperature of 300°C and then dispersed in molten Al 6061 alloy to improve wettability and distribution. Mechanical properties of the composites fabricated by squeeze casting process were compared with the ultrasonic stir casting process. The results revealed that the mechanical properties like tensile strength, compressive strength and hardness of composite fabricate by the ultrasonic assisted squeeze casting process is higher than that of ultrasonic assisted stir casting process. Microstructure shows that there is significant grain refinement in the composite fabricate by the ultrasonic assisted squeeze casting process than ultrasonic assisted stir casting process. © 2015 The Authors. Source

Prajapat S.,IIPS DAVV Indore | Thakur R.S.,MANIT Bhopal
IEEE International Conference on Computer Communication and Control, IC4 2015

Today, securing data of gargantuan size is challenging especially for unstructured data item belonging to industries or business sectors. This paper reviews approaches for investigation of mining algorithms in cryptography and sheds light on application of mining algorithms in symmetric key cryptography. It makes an attempt to find out how classification and association rules can be used to distinguish the encrypted data. The paper also raises some research questions regarding the design issues associated with the implementation of Automatic Variable Key (AVK) in current scenario. © 2015 IEEE. Source

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