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With introduction of wind power distributed generation into the distribution system, the reactive power drawn from and injected to the system are affected. This further affects the load bus voltages due to which on load tap changers of the transformers respond to maintain the terminal voltage. Due to the intermittent behaviour of wind, the reactive power requirements of wind generator vary. This may...
We consider the problem of allocating the cost of a transmission system among load and generator entities. It is a known instance of the classical cooperative game theoretic problem. To solve this problem is a formidable task, as we are dealing with a combinatorial game with transferable utilities. This is an NP hard problem. Therefore, it suffers from the curse of dimensionality. Marginal pricing...
Electromigration (EM) in solder joints under high current density has become a critical reliability issue for the future high density microelectronic packaging. A practical method of atomic density integral (ADI) for predicting solder bump electromigration reliability is proposed in this paper by considering the driving forces of electron wind force, stress gradients, temperature gradients, as well...
In order to investigate small wind turbines, a comprehensive knowledge of mechanical and electrical parameters is required. Permanent Magnet Synchronous Generator (PMSG) is one of the kinds which are widely used for variable speed and direct driven wind power generating. In order to predict the amount of power that can be extracted by the wind turbine in a concerned area the knowledge of wind speed...
This paper presents stiffness of 2-degrees of freedom Parallel Kinematic Machine (PKM). The behavior of PKM is an isotropic, and depends on the tool position within the workspace. It is highly essential to study the variation of stiffness within the workspace as it affects the machining performance. The kinematic and kinetostatic modeling of a planar, two-degree of freedom, generic PKM with prismatic...
The renewable energy sources such as Solar energy and Wind energy are complementary by nature. Utilizing these natural resources to produce power will reduce the power demand on the conventional power generation sector. One of the applications of Solar-Wind hybrid power system (SWHPS) is to reduce the amount of power consumed from the conventional power generation to charge the storage reserves present...
This paper presents an economic analysis of solar chimney power plant (SCPP) of 200 MW capacity in India by taking fifteen different sets of dimensions of chimney height and collector diameter, five sets each corresponding to collector efficiency of 33%, 50% and 65%. Quantity of different materials required and capital cost for construction of 200 MW solar chimney power plant is estimated. Based on...
Medical imaging techniques that are found in hospitals are X-ray imaging, MRI, ultrasound imaging, CT scan. Recently, a lot of scientific research work is being carried out with the aim of the improvement of these methods and the discovery of new non-invasive techniques. As a result, a new optical imaging technique, called Spectral Domain Optical Coherence Tomography (SD-OCT) was proposed in the early...
Differential Global Positioning System (DGPS) is a technique to improve the accuracy of the GPS positioning. In DGPS, error correction signal is transmitted to the surrounding rovers. Any correction loss during transmission may lead to navigation inaccuracy. This problem can be minimized by incorporating Dynamic Neural Networks (DNNs) at the rovers. DNNs can be used to predict the present and future...
The simulation of aerospace vehicles is a challenging job as it consists of various expensive, fragile and unique subsystems. Apart from this, these systems are electrically connected and dynamically operated with the state of the art simulation setup. The first release of the software embedded in them may not fulfil its complete requirements, which may lead to failure of subsystems. So simulation...
This paper discusses an efficient implementation of finite difference method (FDM) and finite element method (FEM) computations for Partial Differential Equation (Poisson Equation) on a message passing cluster with Intel Xeon Phi coprocessors[6,15]. We have performed computations on PARAM YUVA-II [9] which is a message passing cluster with compute nodes as Xeon multi-core processors and Xeon Phi coprocessors...
Intelligent controllers are widely used in industries to control non-linear plants, for which mathematical models are difficult to obtain. Fuzzy logic controllers (FLCs) are often used for the same purpose as they operate on linguistic rules and estimation of uncertainty, which represents the core essence of non-linear systems. However, realization of FLCs on hardware platform is quite an arduous...
With the discontinuity of Selective Availability (SA) by U.S government, obtaining accuracies upto tens of meters by GPS system became simpler. Though the performance level reached to millimeter level accuracy, it is only restricted to military domains and is provided under Precise Positioning Service (PPS) standards. The two different GPS services include PPS and Standard Positioning Service (SPS)...
Modern Electronic Warfare systems need to provide real time location information in a consistent, unambiguous and timely manner. The time difference of arrival (TDOA) techniques used for location determination make use of the method of hyperbolic multilateration. One technique which is widely used for solving non linear hyperbolic equations is the Taylor Series method. This paper discusses the convergence...
Stratified Sampling is one of the most widely used sampling techniques as it increases the precision of the estimate of the survey variable. On the other hand, calibration estimation is a method of adjusting the original design weights to improve survey estimates by using auxiliary information such as the known population total (or mean) of the auxiliary variables. A calibration estimator uses calibrated...
P = {p,:i ∊ Nn}, Q = {qj, : j ∊ Nm}, R = {rk : k ∊ Nk} are considered as three referential sets and A ∊ R (P, Q;I), X ∊ R (Q, R; I), B ∊ R (P, R; I) are three fuzzy relations. We assume that these fuzzy relations are constrained to each other such that A o X = B. If two of the three components are known and other is to be calculated, then it is called fuzzy relation equation. When A and X are known,...
Numerous studies have examined ramp-metering control to relieve highway congestion. Unlike previous research, this paper presents two different optimization problems for maximum system capacity over a highway corridor, using both a time-gap based traffic model describing traffic flow and the limited traffic data measured by existing field facilities. Our proposed algorithms are coordinated ramp-metering...
The average slope of the continental shelf in the world ocean is 0.5° and its width varies considerably. This paper illustrates experimental studies describing the internal wave run-up on different gradients of continental shelf varying from 0.2° to 0.5°. MIT general circulation model is configured with a variable grid, tidal information in the momentum equations and background stratification of density...
Electromigration (EM) in solder joints under high current density has become a critical reliability issue for the future high density microelectronic packaging. A practical method of atomic density integral (ADI) for predicting solder bump electromigration reliability is proposed in this paper. The driving forces electromigration includes electron wind force, stress gradients, temperature gradients,...
Attitude determination is an important component of spacecraft control. Gyro and star sensor as sensors play a vital role in the attitude determination system and the error of them, such as misalignment, bias and noise, is one of the factors that influence the accuracy of attitude determination. In order to analyze the influence of these errors to attitude determination accuracy, orthogonal experiment...
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