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SRM is possible to high output by high speed drive. However, efficiency decreases for increase of iron loss in high speed drive. Therefore, reduction of iron loss is necessary for high efficiency drive. And, we aim to improve of efficiency by electromagnetic steel sheet of low iron loss. We thought Si6.5% electromagnetic steel sheet is suitable to high speed drive application, because Si6.5%material...
In the paper, it takes the Finite Element Method (FEM) to analyze the capacity of the combined connection with bolts and welds. The rationality of the simulation directly affects the correctness of theoretical analysis. So, it needs comprehensive consideration about the reasonable choice of elements, attribute setup, reasonable division of the grid, boundary conditions and machining sequence, etc.
In this paper, an experimental investigation of the effects of droplet diameters on the Leidenfrost temperature and its shifts has been carried out. Tests were conducted on a 304 stainless steel polished surface and a stainless steel surface which was processed by a femtosecond laser to form Above Surface Growth (ASG) nano/microstructures. To determine the Leidenfrost temperatures, the droplet lifetime...
This work aims to characterize the microstructure and temperature field of the hermetic packaging structure by welding the cover made of Kovar alloy and the base made of a low-carbon low-alloy steel (i.e., #10 steel) using parallel seam welding (PSW) process. The microstructure of welded joints and distribution of elements were analyzed by scanning electron microscopy (SEM) equipped with energy dispersive...
Energy storage devices have become more indispensable in our lives. Among various energy storage devices, supercapacitors have been considered as one of the most promising candidates. In terms of the components of supercapacitor, current collector plays a significant role in enhancing the performance of the supercapacitors. Here we report a novel current collector preparation method through depositing...
A solution to the steel slab design problem provides huge savings in the steel industry. Generally, this is a combinatorial optimization problem and it is NP-complete. In this paper a dynamic programming model is presented in order to provide an elegant optimal solution for one variation of the problem. The heuristic used in the model is presented as well. The computational results obtained on real-life...
This paper discusses tendon friction effects regarding guiding and material selection. In order to extract valuable information for designers of tendon driven systems, several experiments are conducted to investigate e. g. the intrinsic friction or sliding effect. The results are used to build an experimental friction model and to derive a set of guidelines. The mechanical designer can use the proposed...
This paper resumes the frictionless fan concept which was introduced at itherm 2012 [1]. This concept was based on a flexible polymer blade, the vibration of which is, as opposite to the piezoelectric driven fan principle, driven by means of a magnetic field. This type of fan can be of interest in regions where otherwise the fluid flow would be stagnant.
Non-metallic chemical components (silicate, sulfide, alumina, globular oxide) originated from production process cause inclusions in steel. These inclusions are one of the important factors that directly affect quality of steel. Before raw steel is used, the detection and classification of the inclusions according to international standards ASTM E45 will prevent faults that may occur during or after...
This paper is about the design, fabrication and analysis of parabolic trough. Idea of research is to concentrate the solar energy at some focal point to generate enough temperature that can generate steam. That steam can be used to run a steam engine for production of electricity. In this research project a parabolic trough is designed and its efficiency is checked experimentally. Luminance and temperature...
It is an urgent need to develop low-cost, scalable-fabricating materials, technologies and equipments that are capable to separate oil-water mixtures efficiently. Traditional separation technologies are discontinuous and expensive. Large-scale separation devices are difficult to be prepared. Here we report stainless steel wire mesh coated with Superhydrophobic and superoleophilic coating, which can...
This paper, aiming to decrease the amount of the transformation caused by the machining of the turbine blades material made of shape forging, investigates the optimal machining method for them. Accordingly, through merely the experiment that used the rectangular test pieces made of the rolled steel with the same chemical composition as the actual blades had been performed, we obtained the findings...
The use of online systems for assessments has become increasingly popular over the past decade. There is a general consensus that these systems have tremendous potential for enhancing teaching and learning even at the tertiary level. Nevertheless, most past studies on the use of online assessments have been focused on lower level or foundational courses that have larger class sizes while the adoption...
This paper presents modifications in design of claw poles in Lundell generator by strategically using anisotropic steel sheets to reduce the leakage flux and hence improve alternator efficiency. Laminated layers of anisotropic steel sheets on the sides of claws are used to reduce leakage flux between the claw poles and same will also enhance the generator output capability. Magnetic field simulations...
ArcelorMittal supplies advanced mechanical and magnetic material data for its iCAReTM line of electrical steels to enable customers to optimise the design of their e-machines. This paper gives an overview of the experimental methodologies to assess the effect of stress concentrations and punched edges on the fatigue behaviour of thin gauge electrical steel sheets. The link between the mechanical properties...
Electrical grounding systems are heavily dependent upon copper. Due to its scrap metal value copper is an attractive target for thieves and vandals. Copper theft presents one of the biggest threats to electrical safety systems and results in escalating costs, operational downtime and threats to life and assets. This is the case for transmission lines, because their isolated location and the unattended...
NBR is an important material used for the stator of progressing cavity pump. The wear mechanisms of different graphite contents of NBR by 45# steel under different loads were investigated. On MPV-600 computer-controlled abrasive wear testing machine, the coefficients of friction were measured continuously. Results showed that wear loss and friction coefficient of NBR decrease with the increasing of...
Structure optimization and the application of light material and process were the two main ways of integral body lightweight. So the ultra high strength steel was applied to the anterior anti-collision beam of integral body was the aim of the study. In this study, the performance development of frontal impact was taken for the example, the material selected of the lightweight was analyzed, and the...
Based on Held's critical initiation criterion of high speed fragment impacting the bare charge, the model for calculating critical initiation speed was proposed for the shelled explosive, the LS-DYNA method was used to simulate the initiation process of shelled explosive impacted by fragment. The results show that, the error of numerical simulation and theoretical calculation was very small, which...
With the help of electron backscatter diffraction (EBSD ) and orientation distribution function (ODF) analysis, experiments of the different batch annealing Parameters were conducted to give an study of texture of Cold-rolling Low Carbon sheet steel based on CSP, and the relationship between initial isothermal temperature and drawing properties has been investigated. Cold-rolled sheet annealing process...
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