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Metallic particle contaminations impair the insulation integrity of gas insulated equipment. The contaminants can be produced by an abrasion between components during assembly or operations. These particles can either be free to move in the GIS bus or they may stick either to an energized electrode or to an insulator surface. In case a metallic particle crosses the gap and comes into contact with...
A boost converter based maximum power point tracking for the non-linear photovoltaic sources is proposed in this paper. As the v-i characteristic of the photovoltaic (PV) source exhibiting non-linear variation with solar insolation continuous tracking of maximum power is mandatory in order to have high overall conversion efficiency. As the tracking time depends on the type of methodology employed,...
This article concerns reconfiguration of an autonomous vehicle, called RobuCar, with four independently driven wheels and two independently adjustable steering angles. A bond graph model of the system is constructed for generating the Analytical Redundancy Relations (ARRs) which are evaluated with actual measurements to generate residuals and to perform structural fault isolation. Once the fault list...
A portable electronic nose system has been developed with an array of five commercially available Metal Oxide Semiconductor (MOS) sensors, where a microcontroller (muc) is used for the pattern recognition. The classification of black tea aroma is carried out in the muc (PIC18F4520) and is based on feed forward multilayer perceptron (FF-MLP) algorithm. With the samples collected from the different...
Attempt to recognize pattern of meteorological parameters over the smaller scale geographical region (district) artificial neural network models have been developed. 54 years data for 1951-2004 have been used, of which the first 41 years (1951-1991) of data are used for training the network and data for the period 1991-2004 are used independently for validation. We have found that the mean absolute...
Removal of impulse noise from images without losing their features is an important requirement in image processing applications. The standard median filter is a good candidate for eliminating impulse noise; however, it fails to preserve the image details when the window size is made larger. In this paper, three nonlinear filtering schemes, based on the recently reported rank-ordered absolute difference...
Admittance characteristics of a rectangular radiating slot in the broad wall of a rectangular waveguide are evaluated by the method of moments, using a conventional approach for free space. The computed result shows excellent agreement with measured results. CST Microwave studio is used for the simulation and is totally based on FIT techniques. The approach considers the Taylor distribution with specific...
The present work is a classification problem applied to diagnosis of diabetes mellitus using back propagation algorithm of artificial neural network (ANN). The data base used for training and testing the ANN has been collected from Sikkim Manipal Institute of Medical Sciences Hospital, Gangtok, Sikkim for the diabetic patients of the state of Sikkim. This work is validated by comparing the network...
Mobile ad hoc networks are a class of dynamic networks without any centralized administration. A major bottleneck in mobile ad hoc networks (MANETs) is the energy consumption since nodes are usually mobile and battery operated. To maximize the lifetime of mobile ad hoc networks (i.e., the lifetime of the nodes themselves) the power depletion of network must be evenly distributed, i.e., there must...
Fault simulation is one of the elemental steps in test pattern generation and is widely used for digital circuits. In case of analog circuits, fault simulation is not generally adopted because of the lack of suitable fault models and the time required for the transistor level simulation of the entire circuit. In this paper, a macromodel level fault model, which is able to represent the faulty behavior...
In general, the problem of reactive power compensation is viewed from two aspects: load compensation and voltage support. Voltage support is generally required to reduce voltage fluctuation at a given terminal of a transmission line. optimal power flow (OPF) model has been developed and analyzed with thyristor controlled series compensator (TCSC) and static var compensator (SVC) for practical power...
Use Cases describe behavioral requirements of software systems in textual form. They are interpreted for creation of analysis, design and implementation artifacts, including user interface (UI). There is a very likelihood of inconsistencies in the interpretation of the Use Cases by different members of software development team. Various research efforts have been made to associate a formal model with...
In this talk, we will introduce the basic architectural aspects and operational features of digital microfluidic based biochips, and demonstrate the techniques that are employed in implementing bioassays. Fault models and testing methodologies for such biochips will also be discussed.
Wireless sensor networks have received considerable attention in recent time due to a number of potential real-life applications. These networks are being increasingly used for geophysical monitoring, highway congestion monitoring, movement tracking, medical monitoring of life signs, supervision of manufacturing process, and so on. Sensor networks usually have intermittent connectivity and are often...
The paper discusses the use of the 'micro-grid' concept to integrate renewable energy generation into the distribution network. In essence, a micro-grid consists of bundled renewable micro sources and loads connected together by fast acting power electronics. Energy storage and low-bandwidth supervisory control is often added. The combined unit on aggregate can appear to the main network as a 'model...
This paper addresses the problem of estimating a linear function of the states of a nonlinear system using sliding mode functional observer approach. Sliding mode functional observers proposed in this paper are of low-order. New conditions for the existence of sliding mode functional observers are derived. A design procedure for the determination of the observer parameters can also be easily derived...
This paper presents the experimental results of a study, which has been carried out to analyze the insulation characteristics of coconut oil in order to check the suitability as the liquid insulation in power transformers. In this study dielectric response measurements were carried out in frequency domain at temperatures of 25degC, 50degC, 80degC. In addition, results of mineral oil samples were taken...
Estimation of the current-reference to compensate for the harmonic and reactive component of the load current is important in a shunt type active power filter. This paper applies ANN based predictive and adaptive reference generation technique. Predictive scheme extracts the information of the fundamental component through an ANN that replaces a low pass filter. This ANN based low pass-filter is trained...
The analysis and control of multi-input integrated DC-DC converter is presented in this paper. The integrated converter is essentially a combination of buck and buck-boost converters. However, on account of integration only one inductor is sufficient enough for performing the power conversion. In order to have simple control strategy as well as simpler compensator design a single loop control scheme,...
In this paper, a novel drive topology for a five phase stepper motor is described in detail. Commercially off the shelf, low cost, standard stepper motor drive ICs are used to derive a novel drive topology for five phase stepper motors which enables closed loop speed and position control powered by inner current control loop. It is proved that the derived topology can be generalized to any stepper...
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