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Results in Engineering
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2590-1230
Published by Elsevier Homepage  [3184 journals]
  • VIKOR Method for Ranking Concrete Bridge Repair Projects with Target-Based
           Criteria

    • Abstract: Publication date: Available online 19 June 2019Source: Results in EngineeringAuthor(s): Zhicheng Gao, Robert Y. Liang Distinguished, Tiemin Xuan With the development of intelligent and automated information system in the information era, the need for more efficient decision making method is growing. An effective method used to rank concrete bridge projects affected by reinforcement corrosion damage will help decision makers of bridge management agencies to better understand the different degrees of urgency for each project. The priority ranking process of different bridge repair projects is complex, since it is hard for decision makers to directly decide which bridge has higher priority when considering many criteria at the same time. The ranking of the different bridge repairing projects can be similar to solving multiple criteria decision making (MCDM) problems. The VIKOR (VlseKriterijumska Optimizcija I Kaompromisno Resenje in Serbian) method is a distance-to-target method which is developed and used to solve MCDM problems in material selection research. Since weights play a significant role in the priority ranking problems, objective weights based on Entropy concept and Target-based standard deviation method and dependent weights are also applied in this study. Several important criteria, which have not been considered in previous literatures, are proposed and the influence of these criteria to the bridge condition is checked and verified by using data information in NBI databased. A numerical example is proposed to illustrate the application of proposed method. Therefore, in this research a new ranking system methodology based on weighted VIKOR method with proposed criteria for ranking bridge projects is presented.
       
  • Double Diffusive Effects On Mixed Convection Casson Fluid Flow Past A Wavy
           Inclined Plate In Presence of Darcian Porous Medium

    • Abstract: Publication date: Available online 19 June 2019Source: Results in EngineeringAuthor(s): D.V. .Krishna Prasad, G.S.Krishna Chaitanya, R.Srinivasa Raju The aim of this research paper is to study the effect of thermal diffusion (Soret) on unsteady magnetohydrodynamic mixed convection flow through an accelerated vertical wavy plate embedded in a darcian porous medium. Fundamental coupled non-linear partial differential equations with fitting boundary conditions control the flow problem. Efficient, stable, and finite element technique providing excellent convergence and versatility in accepting coupled systems of ordinary and partial differential equations is used to obtain numerical solutions for these partial differential equations. Graphical results for velocity, temperature, and concentration fields are discussed and displayed. The effects of emerging parameters on the Skin-friction are arrived at using comprehensive parametric tests. Rate of heat and mass transfer coefficients are graphically represented and examined. The results match with a special case of previously published work. From the present analysis it is reported that the presence of angle of inclination sustains a retarding effect on velocity. The velocity decreases with increasing magnetic field parameter, while the Dufour number and Soret number increase with increasing the same and the concentration field decrease as the Schmidt number increases while the temperature field decreases with increasing Prandtl number and Dufour number.
       
  • Experimental assessment of the 3-axis filament winding machine performance

    • Abstract: Publication date: Available online 11 June 2019Source: Results in EngineeringAuthor(s): Ma Quanjin, M.R.M. Rejab, Nallapaneni Manoj Kumar, M.S. Idris This paper presents the experimental evaluation method analysis of 3-axis filament winding machine performance. Winding circular test is a sufficient method to evaluate machine performance on winding circular repeatability and winding angle quality. It was concluded that the portable 3-axis filament winding machine had a good winding circular repeatability result, which offered 0.83-1.13 mm winding circular distance with 1.75-3.13 % standard deviation. It was provided a good winding angle quality, which relied on 0.35-0.62° difference value with 2.25-8.68 % standard deviation. It is indicated that winding circular test and winding angle measurement methods could be used as the experimental assessment to evaluate winding machine or relevant equipment on winding performance and manufacturing capability.
       
  • Switching Arc Inversion Based on Analysis of Electromagnetic
           Characteristics

    • Abstract: Publication date: Available online 11 June 2019Source: Results in EngineeringAuthor(s): Hongchen Zhao, Xiaoming Liu, Gang Wang It is difficult to describe the characteristics of an arc in low-voltage switching equipment in term of its most essential features using conventional arc models. In this paper, arc inversion is introduced to explore a new research approach to examine the nature of low-voltage switching arcs. Based on electromagnetic analysis, the arc is equivalent to a group of threadlike current segments. Then, the arc parameters are obtained by inverting the magnetic data measured at sampling point array. The multi-population genetic algorithm (MPGA) is adopted to solve the Biot-Savart operator equations to search the arc position, with the current density inversed by truncated generalized singular value decomposition (TGSVD), in which the regularization parameter is chosen by the generalized cross-validation (GCV) criterion. The result shows that, by combining the MPGA with TGSVD, both the position and current distribution of an arc can be reconstructed accurately, which can help realize arc control and guide the design of low-voltage switches with higher parameters.Index Terms-Inversion method, MPGA, switching arc, TGSVD.
       
  • Video analysis of high velocity projectile entering fluid filled tank

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): P.J. Disimile, N. Toy Pressure waves are produced within a fluid filled container when a high-speed projectile impacts and penetrates the fluid at high speed. The consequence of this phenomenon is that these pressure waves may exert large pressures on the walls of the container and may lead to severe damage. The videos in this article show how these pressure waves emanate and how the cavitation region in the wake of the projectile expands and collapses.
       
  • The imaging of fluid sloshing within a closed tank undergoing oscillations

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): P.J. Disimile, N. Toy The formation of dynamic hydraulic jumps in an oscillating rectangular container was performed and videoed with a high resolution, high-speed digital imaging system. The jumps were observed traversing between the walls of the tank when the container was oscillated near the surface wave resonance frequency based on liquid depth and it was found that the directionally based hydraulic jump formation frequency matches the driven frequency. Furthermore, the spatial characteristics of the jump are dependent on the amplitude and frequency of the oscillation.
       
  • Simulation study of the eco green roof in order to reduce heat transfer in
           four different climatic zones

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Elham Mehrinejad Khotbehsara, Abdollah Baghaei Daemei, Farzaneh Asadi Malekjahan Green roof have been investigated as a passive design strategy with various environmental advantages including energy efficiency. In this study the impact of the green roof on thermal behavior and reduce heat transfer of a green roof and to compare it with traditional roofs in reducing heat transfer in four different climate zones was analyzed. The simulation was conducted with DesignBuilder V. 4.5. The studied climates included humid climate represented by Rasht, semi-arid climate represented by Tabriz, tropical and subtropical desert climate represented by Yazd, and subtropical hot desert represented by Bandar Abbas. The thermal data for the green roof that were inputted into the software were composed of specifications of green roof plant species, thermal bulk properties, and green roof thermal parameters such as leaf area index and surface properties. The simulation was done on a residential building block for one year (four seasons) to specify the months in which the green roof could exhibit more optimal thermal behavior. The present study shows that the green roof in Rasht in April and July can help reduce heat loss. Furthermore, in Rasht, the value −0.02, Tabriz −0.87, Yazd −0.795 and Bandar-Abbas −0.335 will contribute to heat transfer. In the end, the green roof in Rasht can improve the reduce heat transfer in April and July.
       
  • The simulation of short-term aging based on the moisture susceptibility of
           asphalt concrete mixtures

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Amjad H. Albayati, Mohammed H. Abduljabbar Asphalt concrete exhibit significant changes in its physical properties owing to the loss of volatile components and oxidation through the short-time aging of the binder that results from exposure to high temperatures during production in mixing plants. Because the moisture susceptibility of asphalt concrete mixes is highly dependent on binder chemistry and its physical property, consequently, the aging affects the moisture resistance of asphalt concrete pavements. However, the degree of this effect varies according to the morphology of the asphalt concrete mixture in addition to the mixture production temperature.The objective of the current AASHTO R30 guidelines for the short-term aging of asphalt concrete is to mimic the oxidation and asphalt absorption into the aggregates that would occur for a typical dense hot-mix asphalt mixture. Within these guidelines, two variables are addressed, namely temperature and time. It is well documented in the literature that the production of asphalt mixtures with different aggregate gradation types as well as temperatures as in the case of warm mix asphalt affects the short-term aging conditions. Based on the aforementioned preface, research on this topic has become necessary.To this end, job mix formulas were prepared in the laboratory for four types of wearing course mixes: dense-graded hot-mix asphalt, open-graded friction course hot-mix asphalt, gap-graded hot-mix asphalt (stone matrix asphalt) and dense-graded warm-mix asphalt. The prepared job mix formulas were forwarded to a mixing plant, and four tons of asphalt concrete mixtures were produced (1 ton each) across four different batches. Samples were taken to the laboratory, and specimens were prepared and tested to determine their moisture susceptibility based on an indirect tensile strength ratio procedure. I contrast, laboratory-produced mixes with the same mix gradations as those of the plant-produced mixes were prepared and subjected to different aging conditions (temperature and time). Their moisture resistance was then evaluated. Finally, short-term aging conditions that accurately simulate the aging process at the mixing plant were determined.
       
  • Bacteria removal efficiency data and properties of Nigerian clay used as a
           household ceramic water filter

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): Fidelis O. Ajibade, Samuel I. Akosile, Opeyemi E. Oluwatuyi, Temitope F. Ajibade, Kayode H. Lasisi, James R. Adewumi, Josiah O. Babatola, Abiose M. Oguntuase The research was aimed at producing a cost-effective ceramic filter for the removal of bacteria in wastewater using locally sourced materials. Clay from several locations in Ekiti state, Nigeria was mixed with sawdust (combustible material) to form a ceramic filter. The results showed that the 50%–50% ratio of Igbara odo clay to sawdust was the most effective and optimum mix. This was in terms of a flow rate of 1.9 ​L/hour, removal efficiencies of 80% and 100% for coliform and E. coli bacteria respectively.
       
  • When diesel NOx aftertreatment systems meet advanced biofuels

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): J.J. Hernández, J. Rodríguez-Fernández, A. Calle-Asensio This micro-article tries to enlighten the effect of highly potential advanced biofuels on diesel NOx after-treatment devices under the driving cycle currently used in the European Union for light-duty vehicles homologation, as well as to encourage research on this topic fort a better design and optimization of these systems. The need of reducing both CO2 emissions (by using, among others, biofuels derived from wastes) and NOx (with more realistic driving cycles as well as with catalytic systems), partly motivated by the last scandals and complaints related to the homologation procedure, have inspired this work.
       
  • New approach for enhancing the performance of gas turbine cycle:
           A comparative study

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): M.N. Khan, I. Tlili In order to achieve higher performance of combined cycle power plant and reducing greenhouse gas emission, recently different technical approaches have been used based on the choice of higher efficiency of pure mechanical components nonetheless these solution remain very expensive. Though, including original combinations of two or more systems are not well treated previously. In this paper a comparative study has been performed for three combined gas turbine cycle configurations S3, S4 and S5 including innovative combinations for both simple gas turbine cycle S1 and regenerative gas turbine cycle S2. The evaluations of these proposed configurations are executed according to the thermodynamics conventional energy and exergy analysis. The effects of the new configurations on the performance and the exergy destruction of the combined cycle plant are investigated. The results indicate that the third configuration S5 is the most beneficial for the industrialists. The analysis method is used to recognize and identify the most substantial system configuration with less exergy destruction. Models that were used in the present study give a novel alternative approach to increases not only the thermal efficiency and net output of power plant by using the same amount of fuel rate but also to reduce exergy losses.
       
  • Measurements and modeling of piston temperature in a research compression
           ignition engine during transient conditions

    • Abstract: Publication date: June 2019Source: Results in Engineering, Volume 2Author(s): E. Mancaruso, L. Sequino The knowledge of piston temperature during internal combustion engine operation represents a precious information to evaluate heat losses and engine efficiency. Experimental measurements of piston temperature during engine functioning is very challenging; hence, modeling this process can be very helpful. In the present work, temperature measurements have been collected using a research compression ignition engine, both in motored and fired mode. They have been used to set-up a 1d model of heat transfer through the piston optical window. A good agreement has been obtained. Moreover, the model can provide information not available from experiments.
       
  • In-cylinder flame luminosity measured from a stratified lean gasoline
           direct injection engine

    • Abstract: Publication date: March 2019Source: Results in Engineering, Volume 1Author(s): J. Jeon, N. Bock, W.F. Northrop In-cylinder flame luminosity has been used to diagnose combustion process and the formation of soot emissions in compression-ignition engines. Increased soot particle emissions from spark-ignited gasoline direct injection (GDI) engines, especially those with stratified fuel-air mixtures, requires investigation of responsible anomalous flame behavior. In this work, spatiotemporal in-cylinder flame luminosity is reported from a lean stratified operating condition in a modern GDI engine. Significant fuel mass injected near top dead center led to detectable piston-top pool fires that have previously correlated to significant soot particle emissions. The demonstrated result shows that measuring in-cylinder flame luminosity is a viable tool for identifying soot-causing flames in GDI engines.
       
  • Progress toward understanding vortex generation in stepped-lip diesel
           engine combustion chambers

    • Abstract: Publication date: March 2019Source: Results in Engineering, Volume 1Author(s): Stephen Busch, Federico Perini Stepped-lip diesel pistons can enhance in-cylinder vortex formation and thereby improve the thermal efficiency and emissions behavior of a diesel engine. Further improvements to diesel combustion systems may be realized through improved understanding of the mechanisms by which fuel sprays interact with pistons to form vortices. Analysis of computational fluid dynamics simulations provides insight about vorticity formation in one particular region of a particular stepped-lip combustion chamber. Interactions at the boundary between the sprays and the piston surface are a source of new vorticity that is transported upward and outward. This process is believed to be the origin of an energetic vortex that has been experimentally observed in the outermost region of the combustion chamber during the mixing-controlled combustion process, and is associated with improved turbulent mixing.
       
  • Analysis of a series hybrid vehicle concept that combines low temperature
           combustion and biofuels as power source

    • Abstract: Publication date: March 2019Source: Results in Engineering, Volume 1Author(s): Antonio García, Javier Monsalve-Serrano This work evaluates the potential of a series hybrid vehicle concept that combines low temperature combustion (LTC) and biofuels as power source. To do this, experimental data from a previous work obtained in a single-cylinder engine running under ethanol-diesel dual-fuel combustion is used. Then, vehicle systems simulations are used to estimate performance and emissions of the LTC hybrid vehicle and compare them versus conventional diesel combustion (CDC). The vehicle selected to perform the simulations is the Opel Vectra, which equips the compression ignition engine used in the experimental tests.The results from the simulations used for the analysis are firstly optimized by combining design of experiments and the Kriging fitting method. The multi-objective optimization allows to determine some characteristics and controls of the hybrid vehicle. The comparison of the estimated performance and emissions of the LTC-hybrid concept versus CDC over the worldwide harmonized light vehicles test cycle (WLTC) and real driving cycle (RDE) revealed clear benefits in terms of energy consumption, CO2 and NOx and soot emissions. In this sense, the hybrid concept enabled a reduction of the final energy consumed of 3% in the RDE cycle and 6.5% in the WLTC as compared to CDC. In terms of engine-out emissions, the CO2 was reduced around 16% versus CDC, and engine-out NOx and soot were reduced below the levels imposed by the Euro 6 regulation. As a penalty, the engine-out HC and CO emissions increased to more than double than CDC. However, based on previous experimental results, it is expected that a conventional diesel oxidation catalyst can reduce the tail-pipe HC and CO levels below the Euro 6 limits.
       
  • Why do we want another journal on engineering issues'

    • Abstract: Publication date: March 2019Source: Results in Engineering, Volume 1Author(s): Antonio García Martinez
       
 
 
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