Crimson Publishers-Mechanical Engineering

 Deformation Mechanisms in a NiobiumAdded Zirconium Alloy via Load Relaxation Tests by Murty KL*, Webber KA and Charit I in Crimson Publishers Abstract:  Load relaxation tests have been performed on a recrystallized Nb-bearing Zr alloy sheet in the rolling direction at various temperatures. The strain rate - stress data thus obtained were used to identify the transitional deformation mechanisms in various modulus-compensated stress regimes. Crystallographic texture of the alloys that controls the extent of mechanical anisotropy was determined. Load relaxation tests are also performed in the direction at 45o to the transverse direction in order to characterize the deformation anisotropy. The degree of anisotropy (in terms of the strain rate ratio) is found to increase with the increase in stress exponent values. https://crimsonpublishers.com/eme/pdf/EME.000586.pdf For More open access journals in  Crimson Publishers please click on link:  https://crimsonpublisher...

  Abstract The main aim of this research is to experimentally investigate the two coupled identical ST500 gammatype Stirling engines and convert thermal energy to cooling energy. Using a new structure and two coupled Stirling engines at different temperatures and pressures and use of biomass fuel within the 4-8 bar average pressure range of the first engine hot source, the 1-4 bar average+ pressure range of the second engine cold source, and Stirling hot engine temperature range of 480-580 ºC, the effective cooling is obtained in the cold engine. In doing tests, attempts were made to reach lower than 9 percent error results in different parts of engine, including insulation, fluid leakage, belt loosing, and measurement devices. According to the obtained results, 8 bars increase in the average pressure range of the gas in the first engine hot source, a 1 bar reduction in the average pressure range of the gas in the second engine cold source, the increased temperature of the hot sour...

  Abstract An internal combustion engine modeling framework has been developed in the MATLAB/Simulink environment to allow engine component blocks to be connected in a physically representative manner to reduce the model build time. Each component block, derived from physical laws, interacts with other blocks according to block connection. In this series paper, detailed combustion modeling is presented among several engine subsystems. In the engine modeling framework, combustion is represented by a spherical flame propagating from the spark plug, and the burn rate is correlated to combustion chamber geometry, laminar flame speed, and turbulence. To accurately predict the burn rate, the quasi-dimensional model requires tuning. The combustion model has been computationally validated in a previous study and will be experimentally validated with real engine test data in the next series paper Read More About This Article:  https://crimsonpublishers.com/eme/fulltext/EME.000582.php R...

  Abstract In this paper, application of a Battery Management System (BMS) with Battery Energy Storage System (BESS) is realized by using solar power. Proposed system is designed for four different 12V, 60Ah batteries used by general purpose as an uninterruptable power supply unit for electronics devices. Furthermore, in developed application, with respect to state of charge of each battery, either batteries are used as energy supply or batteries are charged by solar power. In addition to BMS, battery charger system in order to regulate battery charge voltage is applied. With the application in this paper, by controlling each batteries charge level, an efficient way to use of batteries are provided in order to have a long life Read More about this Article:  https://crimsonpublishers.com/eme/fulltext/EME.000574.php Read More  Crimson Publishers Google Scholar  Articles:  https://scholar.google.com/citations?view_op=view_citation&hl=en&user=2eS4vdYAA...

Vacuum Treatment of Metal in the Process of Continuous Casting by Protasov AV* in Evolutions in Mechanical Engineering_ Vacuum Treatment Mini Review One of the promising areas of liquid steel processing is the development of metal vacuum treatment in the stream during continuous casting (flow Vacuum Treatment ). Several technological schemes of such processes have been developed, however, in practice, the only variant of the process has been implemented at the conditions of converter shop No-2 of Novo-Lipetzk Metallurgical Combine (NLMC) (Figure 1). The technology of flow vacuuming is based on the theoretical works of Professor G A Sokolov [1]. A steel ladle with a special jointing element covering the slide valve is installed on the supports of the CCM, then the hydraulic cylinder is attached to slide valve and the compressed air is given to assembling device.Then the slide valve is opened and vacuum chamber with the help of hydrocylinders is lifted to connecting with the ladle, whi...

Evaluation of Air Flow Characteristics of Aerostatic Thrust Porous Bearings: A Numerical Approach by Marcelo Gustavo Coelho Resende, Leandro José da Silva, Cláudio de Castro Pellegrini and Túlio Hallak Panzera* in Crimson Publishers: Structural engineering Aerostatic porous bearings have been investigated in the last decades for precision engineering designs , since these bearings offer zero-friction and high operating speeds, as well as providing a very precise positioning system without external influence. Numerical methods such as CFD (Computational Fluid Dynamics) play an important role in the design and behavior analysis of porous aerostatic bearings, being possible to adjust the geometry and characteristics of the porous restrictor even before its manufacture In the present work, the behavior of the gas at the inlet and outlet of a porous thrust bearing made of cementitious composites is analysed by numerical simulation using CFD method. The results reveal a stable b...

Evolution of Engineering Acoustic Waves with Metamaterials by Craig SR and Chengzhi Shi* in Evolutions in Mechanical Engineering Acoustic waves are the physical manifestation of mechanical vibrations traveling through a medium. These wave propagations can be described with physical attributes, such as phase, wavelength, amplitude, and velocity. The velocity of an acoustic wave can be determined by two material properties of the propagation medium: the bulk modulus and the density. Specifically, the squared phase velocity of an acoustic wave equals the bulk modulus multiplied by the inverse of the density. For all natural medium, positive bulk modulus and density are observed. The recent development of acoustic metamaterials demonstrate media that exhibit either a negative bulk modulus, a negative density, or both negative bulk modulus and negative density. As the fundamental physics of these metamaterials become better understood, researchers are beginning to develop applica...

Challenge in Structural Behaviours of Corroded Pre-stressed Concrete Beams by Lei Wang* in Evolutions in Mechanical Engineering Strand corrosion is one of the main causes for the deterioration of Pre-stressed concrete structures. Corrosion decreases strand cross-section, causes material deterioration, induces concrete cracking, degrades bond strength and deteriorates the capacity of PC beams. As the high-stress level of prestressing strand, strand corrosion causes a brittle failure of PC beams without warnings. The potential dangers of corrosion in PC beams would be much more severe than that in reinforced concrete members. The structural behaviors should be thoroughly investigated to insure the serviceability and safety of corroded PC beams. https://www.crimsonpublishers.com/eme/fulltext/EME.000507.php For More open access journals in Crimson Publishers please click on link: https://crimsonpublishers.com For More Articles on Evolutions in Mechanical Engineer...

Analysis of Hybrid Power Train System Based on Degree of Freedom by Kun Zhao in  Evolutions in Mechanical Engineering The hybrid power train is one of the most important technologies that have been developed to satisfy the challenging fuel economy and emission standards. A suitable configuration of hybrid power train should not only meet the requirements of vehicle kinematics and dynamics, but also meet the requirement of fuel economy and emission. For this purpose, a hybrid power train system should contain multiple power sources so that the speed and torque of the power sources can be properly distributed to achieve high system efficiency. To achieve optimal distribution of speed and torque, the system should have more speed DOF and torque DOF. Therefore, the hybrid power train system can be analyzed based on the viewpoint of degrees of freedom. https://crimsonpublishers.com/eme/fulltext/EME.000504.php For more open access journals in Crimson Publishers please ...

Urban Performances: Hazards, Risks and Technological Developments  by Bouzid Boudiaf in  Evolutions in Mechanical Engineering Civilization is the advanced social development that is believed to owe its origin to human interaction in cities. But cities do not always have a civilizing effect. In history, the size of a population has corresponded to the availability of resources, particularly food and water. Ever since the Age of Agriculture, the stability of food supplies and the relative security of group settlements have decreased mortality rate and increased fertility. The consequent increased demand leads to exploitation of resources, which invariably exceeds the accessible supply. As a result, a cyclical population decline occurs, through starvation, disease, social and economic declination, migration and war (Facing The Future: People and the Planet 1997). Historical examples abound: recurring famines, the Black Death, colonization, the two World Wars. As cities hav...