(An ISO 9001:2008 Certified Online Journal) ISSN:2455-9660

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Volume 01 Issue 07 (September-2016) | IJERAS

Title: Voltage Stability Analysis of the Nigerian 330kv Grid Using Modal Analysis

Authors: Ewenike N.C, Ezechukwu A.O, Samuel N.O

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Voltage stability study is one of the numerous derivatives of load flow analysis is imperative for the reliable supply of electricity in an electric network grid. Operational conditions vulnerable to voltage instability are identified using static or dynamic schemes with comparative advantage of one over the other. The sensitivity of voltage magnitude to system reactive power variation is established and explored in this thesis by investigating the converged load flow Jacobian sub-matrix sensitive to reactive power variation and known as Modal analysis which is a static voltage stability method. Used in voltage stability investigation, this method predicts the proximity any operational case to voltage collapse from the proximity of eigenvalues to zero. Eigenvalues near zero are indicative of voltage collapse operating points and further analyses of the left and right eigenvectors of eigenvalues close to zero indicates the participation of system components like buses and branches to voltage instability. Though branches as corridors of reactive power flow are influential in voltage stability investigation, this thesis focuses on the participation of network buses, as sites of reactive power variation due to load or generator. In this thesis, the test network used to demonstrate voltage stability by modal analysis is the Nigerian 330kV grid. For several operating modes defined by power ratios, Matlab programmes were used to investigate voltage instability by predicting the proximity to voltage instability and determining the participation of nodes or buses. Results as presented in tables and histograms show that buses 22 and 28 influenced the system voltage stability of all considered operating state and are therefore suitable locations for reactive power compensation so as to increase systems reactive power reserve and ensure voltage stability of all the entire system 

Page 1-8

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Title: Comparison of Double Integration Method With Ansys Software for A Simply Supported Beam

Authors: G.Nethaji, Dinesh Kumar

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bar is a basic component that is fit for withstanding load essentially by opposing against bowing. The bowing power actuated into the material of the bar as an aftereffect of the outer burdens, own weight, range and outside responses to these heaps is known as a bowing minute. Shafts are portrayed by their profile (state of cross-area), their length, and their material. Redirection of a Beam: The diversion anytime on the hub of the pillar is the separation between its position previously, then after the fact stacking. Slant of a Beam: Slope at any area in a redirected shaft is characterized as the edge in radians which the digression at the segment makes with the first hub of the bar. Taking after are the essential strategies which are utilized for discovering the slant and diversion at an area in a stacked pillar: Twofold reconciliation technique Moment–area technique Macaulay's technique Conjugate pillar technique. Keeping in mind the end goal to look at the redirection in a pillar, we should run with twofold joining technique . A twofold joining technique is a strategy used to settle or to decide the avoidance and slant of the just bolstered bar by utilizing a condition of the versatile bend. By utilizing this technique as well as we use to decide the avoidance of the basically bolstered bar by utilizing a product known as ansys16.2 programming.

Page 14-16

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Title: Design and Fabrication of Two Stroke Compressed Air Engine

Authors: Mr. Sivanadhan.S, M.V.Sri KanthN.Rajini Kanth Reddy, K.Bala Krishna

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Today the entire world is looking for option fuel, to full fill the need of fossil fuel in light of the fact that in nearing years there will be lack of fossil fuel. There are couples of alternative of option fuel, for example, sunlight based force, tidal force, geo-warm power, and so on and one of them is Compressed Air. The essential condition for the option fuel is it ought to be renewable and eco- accommodating.

Page 17-20

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Title: Compressive Strength of Ternary Blended Cement Sandcrete Incorporating Rice Husk Ash And Oil Palm Bunch Ash

Authors: L. O. Ettu, H. U. Amadi, D. A. Amatobi, E. Onyezewe, C. U. Ajah

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This work investigated the compressive strength of ternary blended cement sandcrete incorporating rice husk ash (RHA) and oil palm bunch ash (OPBA). Ordinary Portland cement (OPC) was blended with RHA and OPBA by partially replacing OPC with RHA-OPBA at five levels, namely 5%, 10%, 15%, 20%, and 25%. For each replacement level, RHA was admixed with OPBA at five ratios of 100:0, 97.5:2.5, 95:5, 92.5:7.5, and 90:10, making a total of 25 OPC-RHA-OPBA ternary blends. Nine Sandcrete cubes of 150x150x150mm were produced for each of the 25 ternary blends. Nine cubes containing only OPC were also produced as the control, making a total of 234 sandcrete cubes. A constant cementitious material to sand mix ratio of 1:6 and water to cement ratio of 0.6 were used. Three cubes for each ternary blend and the control were crushed to obtain their compressive strengths at 28, 90, and 150 days. The results showed that the compressive strengths of the ternary blended sandcrete greatly increased relative to the control at 90 days of curing and onwards. Even at 25% OPC replacement level and RHA to OPBA proportion of 90:10, sandcrete strength increased from 4.89N/mm2 at 28 days of curing to 7.19N/mm2 at 90 days of curing, indicating 47% increase. The corresponding control sandcrete strengths were 9.77 N/mm2 and 10.98 N/mm2, a strength increase of only 12%. The 90 to 150 day strength values of the OPC-RHA-OPBA ternary blended sandcrete suggest that they could be suitable for use in various civil engineering and building works, especially in situations where high early strength is not crucial.

Page 21-24

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Title: Design and Analysis of Connecting Rod Using Aluminium Alloy 7068 T6, and Forged Steel

Authors: S.Aathresh

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The connecting rod is the middle part between the cylinder and the Crankshaft. Its primary function is to transmit the push and pull from the piston into to the crank pin, along these lines changing over the responding movement of the cylinder into turning movement of the wrench. This proposition portrays outlining and Analysis of interfacing bar. Presently existing associating bar is made by utilizing Forged steel. In this drawing is drafted from the counts. A parametric model of Connecting bar is demonstrated utilizing CATIA V5 programming and to that model, investigation is completed by utilizing ANSYS 16.2 Software. Limited component investigation of associating pole is finished by considering the materials, viz... Aluminum Alloy. The best blend of parameters like Von misses Stress and strain, Deformation, Factor of safety and weight reduction for two wheeler cylinder were done in ANSYS programming. Aluminum Alloy has more factor of safety, reduce the weight, decrease the stress and stiffer than other material like Forged Steel. With Fatigue analysis we can decide the lifetime of the connecting rod

Page 9-13

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