National Institute of Technology Rourkela ,formerly Regional Engineering College Rourkela , is a publicly funded institute of higher learning for engineering and technology located in the steel city of Rourkela, Odisha, India. It is one of the 30 National Institutes of Technology in India and has been recognized as an Institute of National Importance by the National Institutes of Technology Act, 2007. Wikipedia.
Samantaray S.R.,National Institute of Technology Rourkela
IEEE Transactions on Power Delivery | Year: 2011
This paper proposes an effective fault detection technique in distance relaying using phase space. This is based on an embedding theorem which shows that a time series can be mapped to a higher dimensional space called phase space through embedding. Thus, a sampled signal can be transformed in to the phase space so that its features can be more clearly viewed. The original signal is decoupled into two parts as: normal and disturbance part. The fault detection is easily achieved as the disturbance part of the signal produces an irregular shape compared to the shape produced from the normal part of the signal. The fault detection signal using phase space (FDPS), derived from phase-space transformation, effectively detects the faults in the transmission line with wide variations in operating conditions. The results from an extensive study indicate that the proposed FDPS can reliably detect the faults in distance relaying. © 2010 IEEE.
Saha Ray S.,National Institute of Technology Rourkela
Annals of Nuclear Energy | Year: 2012
In the present paper, the numerical approximation methods, applied to efficiently calculate the solution for stochastic point kinetic equations (Hetrick, 1993; Kinard and Allen, 2004) in nuclear reactor dynamics, are investigated. A system of Itô stochastic differential equations has been analyzed to model the neutron density and the delayed neutron precursors in a point nuclear reactor. The resulting system of Itô stochastic differential equations are solved over each time-step size. The methods are verified by considering different initial conditions, experimental data and over constant reactivities. The computational results indicate that the methods are simple and suitable for solving stochastic point kinetic equations. In this article, a numerical investigation is made in order to observe the random oscillations in neutron and precursor population dynamics in subcritical and critical reactors. © 2012 Elsevier Ltd. All rights reserved.
Satapathy A.K.,National Institute of Technology Rourkela
International Journal of Thermal Sciences | Year: 2010
This paper deals with analytical solution of steady-state heat transfer for laminar, two-dimensional and rarefied gas flow in an infinite microtube subjected to mixed boundary conditions. To account for the slip-flow characteristics of microscale heat transfer, temperature jump condition at the wall has been incorporated in the model while the fluid velocity is assumed to be constant (slug flow). The energy equation in the thermal entrance region has been solved by the method of separation of variables. The solution yields closed form expressions for bulk-mean temperature and Nusselt number in terms of Knudsen number and Peclet number. © 2009 Elsevier Masson SAS. All rights reserved.
Maity S.,National Institute of Technology Rourkela
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2013
This paper finds and investigates the application of fixed-event-time based discretized sliding mode (DSM) controller in dc-dc buck converter, to achieve fast transient response and high robustness under wide parameters variation. We show that how these can be achieved by integrating the concept of Utkin's equivalent control law and discontinuous border-collision bifurcation (DBCB) theory developed for 2-D discontinuous piecewise smooth (PWS) maps. Moreover, based on derived 2-D discontinuous maps of DSM-controlled converter, we investigate its inherent steady-state dynamical properties or bifurcation behaviors under different parameters variation. Numerically as well as experimentally obtained bifurcation diagrams are then presented to show the domains of existence of different oscillatory modes and their sequence of occurrence. Such phenomena are not only useful to study the robustness of the system but may also facilitates to design the input filter with fast transient response. The performance of DSM controller is experimentally verified and compared with hysteresis and classical peak current-mode controller. © 2004-2012 IEEE.
Mahapatro A.,Indian National Institute of Engineering |
Khilar P.M.,National Institute of Technology Rourkela
IEEE Communications Surveys and Tutorials | Year: 2013
The sensor nodes in wireless sensor networks may be deployed in unattended and possibly hostile environments. The ill-disposed environment affects the monitoring infrastructure that includes the sensor nodes and the network. In addition, node failures and environmental hazards cause frequent topology changes, communication failures, and network partitioning. This in turn adds a new dimension to the fragility of the network topology. Such perturbations are far more common than those found in conventional wireless networks thus, demand efficient techniques for discovering disruptive behavior in such networks. Traditional fault diagnosis techniques devised for multiprocessor systems are not directly applicable to wireless sensor networks due to their specific requirements and limitations. This survey integrates research efforts that have been produced in fault diagnosis specifically for wireless sensor networks. The survey aims at clarifying and uncovering the potential of this technology by providing the technique-based taxonomy. The fault diagnosis techniques are classified based on the nature of the tests, correlation between sensor readings and characteristics of sensor nodes and the network. © 1998-2012 IEEE.