International Journal of Advances in Engineering Sciences
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159 research outputs found
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IMPACT OF UNSCHEDULED INTERCHANGE PRICING IN COMPETITIVE ELECTRICITY MARKET
No full textThis paper proposes an approach for analysis and determination of unscheduled interchange based on Frequency Based Tariff for competitive electricity market. In this paper, combined model consisting of the pool, bilateral and multilateral transaction of deregulated power sector has been considered [11]. In competitive electricity market, power schedule is decided 24 hours ahead of real market but it has been observed that some of the market participants are diverted from their commitments regarding either supply of scheduled generation or withdrawal of scheduled load from the pool. Due to these reasons, the power system deviates from the optimized solutions. So there is an urgent need for determination of unscheduled interchange revenue paid by such defaulter market participants. In this paper, frequency based technique has been applied for determination of unscheduled interchange revenue paid by such defaulter market participants. The frequency based technique has been applied to double auction modified IEEE-30 bus test system. The whole transmission system has been divided into three sections; prevailing frequency in these regions can be assumed due to unscheduled interchange occurring in the system. In this paper, Frequency based tariff has been proposed for implementation to generalized deregulated model consisting of the pool, bilateral and multilateral transaction
PRESSURE DROP IN THE WAKE BEHIND A TRUNCATED AEROFOIL AND ITS APPLICATION
No full textWakes are formed behind a blunt body over which fluid flows due to separation of boundary layer. This phenomenon is associated with the formation of vortices resulting in large losses  of energy. Pressure distribution in wake is nearly uniform across the wake and its magnitude is less than the upstream pressure. In the present work, it is proposed to use a blunt body, such as a wing with truncated aerofoil cross section, as a flow deflector, behind which the wake will be formed due to wind flow. Primary objective of the present work is to correlate the wake pressure with the geometry of the deflector and the wind speed. A series of models of different length and nose angles have been fabricated and tested in the low speed airflow rig at varying upstream air velocities. Data obtained from these tests indicate that the pressure drop in the wake is strongly related to the geometry of the flow deflector and upstream air velocity. Higher-pressure drop can be obtained by increasing the chord, nose angle or wind speed. This pressure drop can be used for enhancing the air circulation to an enclosure, say kitchen or an air-conditioned room, from which stale/foul air is to be removed
A Parametric Study of Temperature Dependent Properties Influenced due to Transient Temperature Field Developed in Arc Welded Steel Butt Joints
No full textThis article describes a detailed study of variation of temperature dependent properties developed due to the transient temperature field involved in making arc welded butt joints. Four rectangular plate butt joints of AISI 1040 material, prepared at four different heat inputs with constant welding velocity. Experimentally temperature has been measured at predefined locations of the plate during welding by mounting of thermocouples. The heat transfer coefficient based on experimental results has been compared with established Vinokurov’s empirical correlation. Based on critical plate thickness, cooling rate has been studied to visualize the variation with heat input. It was found out that convection - radiation coupled heat transfer has dominant effect in the region of Heat Affected Zone (HAZ), near the fusion boundary (300°C-900°C) and radiation heat transfer plays a dominant role in heat loss due to moving point heat source
Use of Recycled Coarse Aggregate as an Alternative of Natural Coarse Aggregate for Structural Construction
No full textAggregates prepared from demolished structures can be used as construction material, particularly where scarcity of natural aggregate is severe. The main purpose of this study is to compare the properties and strength of the natural coarse aggregate (NCA) and recycled coarse aggregate (RCA) for both virgin and percentile mixing condition of both, followed by suggesting a mixing ratio for structural use. Recycled coarse aggregate exhibits different physical properties than normal aggregate. For improvement of the properties of recycled aggregate, a fixed percentage of Natural aggregate (NA) was mixed with Recycled aggregate (RA) and their properties were also investigated. Bulk density and specific gravity of aggregate gradually decreases with the increasing of RA percentage in mixture. On the contrary, percentage of void and absorption capacity value increased with increasing percentage of Recycled aggregate (RA). Only the 80%NA-20%RA mixing combinations meet the standard value for all four physical properties, while all the mixing ratios  exhibits compressive strength value above 2500 psi in 28 days test. In combination of physical properties and compressive strength, 80%NA-20%RA combination is best for safe structural use
Improvised ABC Optimization Algorithm for Engineering Design Problems
No full textIn the basic Artificial Bee Colony (ABC) algorithm, if the fitness value associated with a food source is not improved for a certain number of specified trials then the corresponding bee becomes a scout to which a random value is assigned for finding the new food source. Basically, it is a mechanism of pulling out the candidate solution which may be entrapped in some local optimizer due to which its value is not improving. In the present study, we propose two new mechanisms for the movements of scout bees. In the first method, the scout bee follows a non-linear interpolated path while in the second one, scout bee follows Gaussian movement. Numerical results and statistical analysis of benchmark unconstrained, constrained and real life engineering design problems indicate that the proposed modifications enhance the performance of ABC
Runoff Modelling using different member ship functions in Adaptive Neuro fuzzy inference system
No full textRainfall runoff modelling using adaptive neuro fuzzy inference system has been presented. In the present study ANFIS models are developed using different membership functions Triangular, Trapezoidal, Bell-shaped, Sigmoid and Gaussian method. All the models are compared with the statistical tests. West flowing river Nethravathi located in Karnataka, India has been selected as study area. It was observed that adaptive neuro fuzzy inference system using Triangular membership function show a good performance compared to other models developed
Design and Stress Analysis of Steering Rack Using CAE Tool
No full textThis paper deals with the stress analysis of Steering Rack. Steering Rack Bending CAE analysis technology is indispensable for developing and mass-producing the Steering Gear assembly. By using Finite Element method, a stress analysis has been carried out. Steering Rack Deflection and Bending stresses are found. These stresses are compared with analytical results. Comparison study shows good agreement of analytical results and CAE results. Modeling has been done by Creo 1.0 and Analysis has been done by Creo Simulation
A POSTPROCESSING TECHNIQUE FOR COMPRESSION ARTIFACT REMOVAL IN IMAGES
No full textAbstract- Image processing is used to process information according to limited bandwidth of transmission media and limited capacity of storage devices. Digital image and video are mostly coded using discrete cosine transform(DCT) and discrete wavelet transform(DWT) which provide visual distortion called Artifact.   Due to the huge data requirements for multimedia, it is required to get more compression with less visual defects. The visual artifacts in highly compressed images can be reduced by post processing technique. BDCT is adopted by widely used image/video compression standards such JPEG, MPEG-1, MPEG-2, MPEG-4, H.263 due to its high energy compression, low computational complexity and its ease of implementation. The popular international standard for compression, the Joint Photographers Expert Group (JPEG) can lead to noticeable discontinuities along the boundaries called the ‘blocking artifacts’. In this paper an analysis is provided for different type of Post-processing techniques and proposes a simple approach to reduce blocking artifact which occur during the compression in image processing.Â
Effect of Heat Treatment on Coated Ceramics for Composite Formation by Laser Processing
No full textMetal Matrix Composites (MMCs) now-a-days are gaining wide popularity because of their superior mechanical properties such as high mechanical strength; wear resistance, excellent thermal conductivity and ability to retain strength at high temperature. However, there still exist challenges in producing high quality MMCs by different laser additive manufacturing processes, and one such important process is Direct Metal Laser Sintering (DMLS). To obtain the highly densified products by DMLS the critical factor is attaining excellent bonding between the reinforcement and matrix. Further to achieve more improvement in uniform dispersion and mechanical properties, there is a need to focus on minimizing the interfacial reaction between the matrix and reinforcement. The above mentioned critical issues associated with MMCs are addressed in the recent times by improving the wettability of the reinforcement. Among these, metallic coating of the ceramic reinforcements are gaining wide spread acceptance to address the above issues. Electroless plating technique can be used to coat metallic coatings on ceramic reinforcements. Several parameters influence the process of coating, on the ceramic particles to get uniform and adherent deposition of metallic particles including pre-treatment of ceramic powder. With reference to the above facts, this paper focuses on the methodology for achieving a thin uniform Nickel-Phosphide (Ni-P) coating on Siliconcarbide (SiC) particles, which is the most commonly used ceramic reinforcement material to develop MMCs by DMLS process and also about the importance of heat treatment of ceramic powders after coating. Scanning Electron Micrograph (SEM), Energy Dispersive Spectroscopy (EDAX), and X-ray Diffraction (XRD) studies have been carried out on the coated ceramic particles. These studies clearly reveal the uniform coating of Nickel-Phosphide on ceramic particles and also reveal that the coating on the surface of the SiC is in amorphous before heat treatment and reaches crystalline state after heat treatment indicating the presence of stable Ni and Ni3P phases
Design and Simulation of compact wideband Omega-Shape Antenna for UWB & Bluetooth Applications
No full textThis paper presents antenna design and analysis for UWB applications. A novel planar ultrawideband (UWB) antenna consists of an omega-shaped radiating patch and a partially ground plane is proposed. With this design, the return loss achieved i.e lower than -10 dB in 3.1–10.6 GHz frequency range and the radiation pattern is highly similar to the monopole antenna. This antenna has been designed and simulated on HFSS and has given wide impedance bandwidth from 2.4 to 11.7 GHz , which covers both UWB and Bluetooth antenna with a stable radiation pattern and constant gain from 3 to 6dBi