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Mechanical and Electrical Technology (ICMET), 2010 2nd International Conference on

Date 10-12 Sept. 2010

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Displaying Results 1 - 25 of 173
  • [Front and back cover]

    Page(s): c1 - c4
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    Freely Available from IEEE
  • [Title page]

    Page(s): i - xx
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    Freely Available from IEEE
  • Analyzing distortion of aircraft Structural part in NC machining based on FEM simulation

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1727 KB) |  | HTML iconHTML  

    NC machining distortion theory is studied by analyzing the typical aircraft wing rib aluminum alloy structural part. The reasons which lead to machining distortion are accounted for. The research method and process of theoretical model, finite element analysis and milling experiment are presented. The effect of residual stresses on machining distortion which distribute in the aircraft structure part is analyzed. The initial residual stress distribution which generated from material heat treatment is simulated by using thermal-mechanical coupling analysis of the FEM software. Cutting simulation is executed by exploiting the static element deactivation technique. The element is deactivated via Birth/Death feature in ANSYS software. The distortion results generated by the machining simulation are compared with the actual machining data. It appears that both distortion trends are consistent. The validity of the analysis method and the finite element analysis model is verified. Several methods which can be used to predicting and controlling machining distortion are proposed. View full abstract»

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  • Energy and exergy efficiencies in agricultural and utility sectors of Iran compared with other countries

    Page(s): 6 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (687 KB) |  | HTML iconHTML  

    Energy consumption and carbon emissions in Iran have risen rapidly in recent years which is not acceptable regarding environmental regulations. Government officials have been trying to resolve this problem, but so far there has been less success. Exergy analysis method is a powerful tool, which has been successfully used for estimating energy utilization efficiencies of countries. In this study, energy and exergy analysis models for agricultural and utility sectors of Iran are applied. Energy and exergy analysis are performed for two devices (pumps, tractors) in agricultural sector and two subsectors (power plants and hydroelectric) in utility sector. The analyses are based on the actual data presented by ministry of energy officials over the period 1994-2006. The energy and exergy efficiencies in agricultural sector of Iran during 1994-2006 are found to range from 29% to 41.7%, and from 16.9% to 20.2% respectively, and in the utility sector are obtained to range from 33.44% to 39.27%. The result was compared with other countries and it is seen that energy and exergy efficiencies in Iran is higher than some countries and lower than some others. However, it cannot be deduced that one country is better than another, because exergy efficiency depends on different factors like climate, population and structure of energy system and the main differences resulted from the structure of the country. It is seen that exergy efficiency of agricultural sector in Saudi Arabia is higher than that of Iran. However as stated above it can not be concluded that agricultural sector in Saudi Arabia is better than in Iran. It is seen that countries like Saudi Arabia, Iran and Malaysia which the contribution of power plants in electricity generation is about 90%, have low exergy efficiencies in utility sector. This is due to the fact that irreversibilities of thermal power plants are relatively high compared to hydroelectric power plants. View full abstract»

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  • A numerical study of the motion of a single drop in simple shear flow: Density ratio effects

    Page(s): 11 - 14
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    Three-dimensional numerical simulations are performed to study the density ratio effects on the cross-stream migration of a drop in simple shear flow at finite Reynolds numbers using a front-tracking/finite difference method. The gravity force is also included. For slightly buoyant drops (η = 0.998 or 1.002), the equilibrium position of drops are close to either of the walls, depending on whether the drop leads or lags the ambient fluid. For larger buoyancy (η = 0.95 or 1.05), the final equilibrium position, moves to the centreline. If the drop is slightly buoyant, the slip velocity is much larger than that of a heavier drop. View full abstract»

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  • AWSJ cutting of glass - an experimental study of the effect of process parameters on the depth of cut and kerf width using DOE

    Page(s): 15 - 19
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (849 KB) |  | HTML iconHTML  

    This paper discusses the use of Abrasive Water Suspension Jets (AWSJ) for the cutting of glass. The experimental investigation of the combined effect of process parameters on the depth of cut and kerf width produced by AWSJ has been carried out using Design of Experiments (DOE). DOE tools such as Orthogonal Array (OA) and Analysis of Variance (ANOVA) have been used to design the experiments and to analyze the experimental data respectively. ANOVA results indicate that the effect of pressure on depth of cut is maximum (50%) followed by abrasive size (22%) and feed (12%). Whereas the effect of standoff distance on kerf width is maximum (75%) followed by pressure (17%). View full abstract»

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  • Physical and basic strength of prepared nano structured MgO

    Page(s): 20 - 23
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (797 KB) |  | HTML iconHTML  

    Physico-chemical properties of MgO depend on the method of preparations. MgO with (100) rock salt structure contains surface cavity and defects that are important for their chemical reactivity. In this study, nano structured MgO is prepared by hydration and dehydration method. Its chemical characterize is then translated into its basic strength using back titration method. This study also shows that there comprise two basic sites at the prepared sample; MgOH and MgO centres. As the nano structured MgO were prepared, more surface cavity and defect were present, thus, exposing more O2-, which influence the more basic strength. Finally it was found that the basic strength is the highest when the sample nano structures MgO prepared at temperature higher than 500°C. View full abstract»

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  • Pattern recognition method for detecting fault in EHV transmission lines

    Page(s): 24 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (527 KB) |  | HTML iconHTML  

    This paper presents a new approach for detecting and locating faults on an EHV transmission line using the method of pattern recognition. This technique of recognizing the waveform patterns can differentiate the fault condition with normal condition. A fault must be detected at its inception and issuing an output signal indicating this condition. Our approach is based on the fact that whenever fault occurs in any of the phases of transmission lines the impedance drops and current in the faulted phase rises. ANN backpropagation algorithm is used for training purpose, the learning process trained and tested a data set of several types of fault, the proposed method of detecting and locating faults gives great results which can support a new generation of very high speed protective relaying system. View full abstract»

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  • Exploring vibration based method for crack detection in turbine blade

    Page(s): 28 - 33
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1123 KB) |  | HTML iconHTML  

    In case of a low pressure steam turbine the crack like flaws due to low cycle fatigue (LCF) is one of the main reasons for its premature failure as reported by various researchers. Non destructive testing (NDT) methods like dye penetrate, magnetic particle induction, acoustic, ultrasonic etc. are used for detection of crack which are very costly and time consuming task. Also vicinity of the fault has to be known beforehand and area has to be readily accessible. Since last two decades lot of research has been done in using vibration analysis to detect crack in beams by using modal parameters like natural frequency, mode shape, damping etc. In this research work an attempt is made to extend vibration characteristic based method for detection of crack in turbine blade. The finite element method is used with development of stiffness matrix for cracked element from the theory of linear elastic fracture mechanics. View full abstract»

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  • Study of advanced power flow analysis for intelligent power and energy systems

    Page(s): 34 - 37
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB) |  | HTML iconHTML  

    In this paper, a case study using EDSA® (Electrical Design and Simulation Analysis) software is presented with the objective to minimize the total cost and power losses using an adequate power correction system. A simple four bus system is analyzed to study different tools provided by the software for steady state and transient studies. The user friendly GUI is very advanced and can be effectively used to plot various signals. It is observed that the EDSA is an effective and efficient analytical tool to carry out such studies. View full abstract»

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  • Numerical analysis of a centrifugal fan for performance enhancement using boundary layer fences on the volute casing

    Page(s): 38 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2830 KB) |  | HTML iconHTML  

    Flow within the centrifugal impeller and diffuser passage is a decelerating flow with an adverse pressure gradient along the stream wise path. This flow tends to be in a state of instability with flow separation zones. Several experimental attempts were made to assess the effectiveness of using boundary layer fences to realign the flow in the regions of flow separation to make the flow align itself into stream wise direction so as to minimize the loss and improve the overall efficiency of the diffusion process. With the development of CFD, a numerical whole field analysis of the effect of boundary layer fences in discrete regions of suspected separation points is possible. However it is found from the literature that there has been no significant attempt to use this tool to explore numerically, the utility of the fences on the flow field. This paper attempts to explore the effect of boundary layer fences corresponding to various geometrical configurations on the volute casing. It is shown from the analysis that the fences mounted on the initial half measured from the tongue of the volute casing surface improves the static pressure recovery across the fan. Fences provided elsewhere on the casing does not show any improvement in the performance of the fan. View full abstract»

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  • Cyclic combustion studies of a CI engine operating on jatropha B20 fuel

    Page(s): 43 - 46
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1369 KB) |  | HTML iconHTML  

    The effect of injector opening pressure and injection timing on cyclic variations in combustion parameters of a CI engine fuelled with methyl esters of jatropha oil blended with petroleum diesel for 20% volume ratio(B20) at full load, are reported in this paper. The experiments were carried out at three injection timings of 20°bTDC, 23°bTDC, 26°bTDC and four IOP's of 180, 200, 220 & 240 bar. It was observed that advancing the injection timing and increasing the IOP up to 220 bar resulted in lower cyclic variations in peak pressure and IMEP, but at the cost of higher rate of pressure rise. View full abstract»

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  • Magnetic imaging in non-destructive testing

    Page(s): 47 - 49
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    Fluxset magnetic sensor based magnetic imaging applications and their benefits are presented in this paper in the scopes of aviation related non-destructive testing applications. View full abstract»

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  • Computation of aerodynamic performance about a swept wing with simulated rime ice accretion

    Page(s): 50 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1813 KB) |  | HTML iconHTML  

    This paper deals with the computational studies carried out on the aircraft swept wing with and without a simulated 5 minutes rime ice accretion at subsonic Mach number conditions. The aerodynamic performances changes of lift coefficients, drag coefficients and pressure coefficients were evaluated. The computations were carried out at Mach number 0.4758 with Reynolds number 5.61 × 106 conditions to obtain the flow field around the aircraft swept wing with and without a simulated 5 minutes rime ice accretion. The aircraft wing with rime ice shape was extended across the entire span of the wing. The aerodynamic performance of the aircraft swept wing with and without ice accretion on the angle of attack range -2 to 16 degrees has also been investigated. This computational study is based on the commercial Fluent 6.3.26 code, was used for solving the set of governing equations using the one equation Spalart-Allmaras (S-A) turbulence model and second order upwind differencing. The CFD computation can also accurately predict the aerodynamic performance changes of lift and drag coefficients until up to stall. View full abstract»

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  • Singular configuration research of RRRP manipulators in space

    Page(s): 55 - 58
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (546 KB) |  | HTML iconHTML  

    End-effector will lose one or some independent component motion when serial mechanism moves to singular configuration, which leads to decreasing of degree of Freedom. That not only affects the finish of expectant motion, but also makes the control of manipulator difficult. A general solver is set up to deal with the problem of the expressing of the joint screws of open series robot. Then the solver is applied to find the singular configuration to the RRRP mechanism. The condition of singular configuration is attained. And the linear correlation of axis screws is analyzed by using Grassmann line geometry method. The results provide an important reference to the Utilizing and avoiding of singular configuration when designing and controlling the manipulators in space. View full abstract»

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  • A new optimization algorithm for solving NP-hard problems

    Page(s): 59 - 63
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    The Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Simulated Annealing, and Tabu search that belong to the Evolutionary Computations Algorithms (ECs) are not suitable for fine tuning structures as they neglect all conventional heuristics. In most of the NP-hard problems, the best solution rarely be completely random, it follows one or more rules (heuristics). In this paper a new algorithm titled “Shaking Optimization Algorithm” is proposed that follows the common methodology of the Evolutionary Computations while utilizing different heuristics during the evolution process of the solution. The proposed approach is applied to the Job Shop Scheduling problems (JSS) and gives promising results compared with that of GA, PSO, SA, and TS algorithms. View full abstract»

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  • Corrosion inhibition of 15 Vol. % 6061 Al alloy/SiCp composite in 1 M hydrochloric acid medium

    Page(s): 64 - 67
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (689 KB) |  | HTML iconHTML  

    The inhibition effect of o- cresol on the corrosion of 6061 Al alloy/SiCp composite in 1 M hydrochloric acid solution at four different temperatures has been investigated using potentiostatic polarization technique and weight loss method. The results obtained reveal that o-cresol is an efficient cathodic inhibitor with greater than 70% of efficiency in the range of temperature studied. The adsorption of the inhibitor on the composite surface was found to obey Temkins' adsorption isotherm and the inhibition is governed by physisorption mechanism. View full abstract»

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  • Total Productive Maintenance of a Diesel power generating unit of a institution campus

    Page(s): 68 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (588 KB) |  | HTML iconHTML  

    Total Productive Maintenance (TPM) provides a comprehensive, life cycle approach, to equipment management that minimizes equipment failures, production defects and accidents. It involves everyone in the organization from top level management to production mechanics and production support groups to outside suppliers. The objective is to continuously improve the availability and prevent the degradation of equipment to achieve maximum effectiveness. These objectives require strong management support as well as continuous use of work teams and small group activities to achieve incremental improvements. TPM is not a radically new idea; it is simply the next step in the evolution of good maintenance practices. The case study was carried out to check for the Overall Equipment Efficiency (OEE) of Different diesel generator-sets in the one of the Institutions Power Houses. On the basis of collected data and we calculated OEE of the four power house. We find out Availability, Performance efficiency, Quality rate. By using this data we calculated OEE of the four power house and compared. a) In Power House 1 - Generator 1 has an OEE of 85.12%, Generator 2 has an OEE of 84.61%, Generator 3 has an OEE of 84.44%, and Generator 4 has an OEE of 84.73%, b) In Power House 2 - Generator 1 has an OEE of 87.25%, Generator 2 has an OEE of 87.31%, c) Power House 3- Generator has an OEE of 88.63%, d) Power House 4 - Generator has an OEE of 85.06 %, we have to achieve 90% OEE. View full abstract»

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  • Semantic formal reasoning solution for personalized home telecare

    Page(s): 72 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    Modern home telehealth care systems should support personalized data processing and environment monitoring for context awareness. Semantic rule based approach has been proposed by many authors to overcome problems coming from large amounts of location and patient-specific, typically inconsistent monitoring data. However, existing solutions just present proof of concept and do not address implementation feasibility and practical issues of eHealth system compatibility. We describe a telehealth care solution employing Prolog programs based on defeasible rule-based reasoning and SNOMED medical terminology system deployed in home digital TV receivers. View full abstract»

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  • Active force control of 3-RRR planar parallel manipulator

    Page(s): 77 - 81
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (995 KB) |  | HTML iconHTML  

    This paper presents a new and novel method to control a 3-RRR (revolute-revolute-revolute) planar parallel manipulator using an active force control (AFC) strategy. A traditional proportional-integral-derivative (PID) controller was first designed and developed to demonstrate the basic and stable response of the manipulator in performing trajectory tracking tasks. Later, the AFC section was incorporated into the control scheme in cascade form by adding it in series with the PID controller (PID+AFC), its primary aim of which is to improve the overall system dynamic performance particularly when the manipulator is subjected to different loading conditions. Results clearly illustrate the robustness and effectiveness of the proposed AFC-based scheme in rejecting the disturbances compared to the traditional PID controller. View full abstract»

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  • The effect of fuel volatility on droplet depletion rate and penetration of vaporizing fuel droplets in a Gas Turbine Combustor

    Page(s): 82 - 86
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (845 KB) |  | HTML iconHTML  

    It is well recognized that the fuel volatility has significant role in the dispersion and penetration of the fuel droplets sprayed into a combustor. Hence a study of the fuel droplet penetration and vaporization histories of a liquid fuel spray injected into a turbulent swirling flow of air through a typical can type Gas Turbine Combustor have been evaluated from numerical solutions of the conservation equations in gas and droplet phases. It is observed from the study that generally a higher swirl decrease the droplet penetration rate irrespective of the fuel volatility, but the effect is more pronounced for lighter droplet particles of n hexane than for the heavier kerosene droplets. Also an increase in spray cone angle shows a drastic reduction in the penetration of the spray. The effect of fuel volatility is marginal for different Spray cone angles as the droplet penetration is dictated more by the spray dynamics due to changed spray cone angle than the fuel volatility. But an increase in combustor pressure reduces the droplet penetration considerably. The fuel droplets with higher volatility seem to travel longer in a higher ambience more due to decreased rate of vaporization at higher pressure. View full abstract»

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  • Influence of process parameters on the quality of hole in drilling of GFRP composites - an experimental investigation using DOE

    Page(s): 87 - 90
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    In recent days composites are finding wide application in all fields because of their specific properties. Drilling is the most common machining operation performed on composites and the quality of hole has an important bearing on its applications. The quality of the drilled hole is mainly defined by delamination, surface roughness, and cylindricity, and it depends upon process variables such as thrust and torque. This paper deals with the study of the influence of process parameters on the quality of hole in drilling of Glass Fiber Reinforced Polymer (GFRP) composites. The results have shown that the drill geometry has major influence on the quality of drilled hole in comparison to drill size, work-piece thickness, volume fraction, fiber orientation, speed and feed. View full abstract»

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  • Development of parameterized roll pass design based on a hybrid model

    Page(s): 91 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (429 KB) |  | HTML iconHTML  

    Hot steel rolling is an important manufacturing process used to efficiently provide a wide range of products of high quantity and quality. In order to meet the continuously increasing demands, both an improved quality and a broader variety of products must be delivered along with improvements in efficiency, reliability and sustainability of rolling mill systems. Further development of roll pass design presents one of the central aspects in these efforts. However, to optimize roll pass design, numerous combinations of system parameters must be analyzed and correlated. This cannot be done through a single deterministic model. Therefore, a parameterized hybrid model based on combining cross-disciplinary knowledge is proposed to improve the quality and efficiency of roll pass design. Application of artificial intelligent algorithms is envisaged for the roll pass design optimization and a methodology for constructing the relevant hybrid model is described. View full abstract»

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  • Embedded control of LCC resonant converter analysis, design, simulation and experimental results

    Page(s): 94 - 98
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (630 KB) |  | HTML iconHTML  

    The Objective of this paper is to design LCC resonant converter with 200W, 250 KHz switching frequency which is used for radar power supply and to verify the results using PSPICE Simulation for wide variation in loading conditions. We have used motor load (R-L-E) and embedded based triggering circuit. The embedded `C' Program is checked in Keil Software and also triggering circuit is simulated in PSPICE Software. In this paper analysis, simulation and experimental results were presented and compared with theoretical results. View full abstract»

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  • Investigation of thrust, torque and delamination on drilling of Glass fabric/Polypropylene matrix composite

    Page(s): 99 - 103
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1299 KB) |  | HTML iconHTML  

    Polymer composites are rapidly emerging as important engineering materials. They have a phenomenal and a wide range of applications in the field of Aerospace and Automotive Engineering. One of the major techniques in composite manufacturing is drilling. In the present study, Glass fabric/ Polypropylene matrix composite is drilled in Arix VMC 100 CNC Drilling machine with High Speed Steel (HSS) drill bit of 8 mm diameter at three different Cutting speeds and three different feed rates. Thrust, torque studies were done to see the effect on delamination factor and the experiment was done based on the Design of Experiments (DOE). Results provide some useful information. Tool wear study was done for the worst drilling parameter. Drilling with HSS drill bit at a speed of 2500 rpm and at a feed of 20 mm/min gave delamination factor closer to unity with minimal thrust and torque. View full abstract»

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