Materials Literature
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Three 12-slot/10-pole closed slot permanent magnet machines having either all or alternate teeth wound winding and equal or unequal tooth width stator are analyzed and compared in terms of spike type voltage distortion. The difference between three machines, such as the rotor positions determining voltage distortion a…
This paper evaluates a novel 12/10-pole, three-phase, segmented-stator hybrid excitation SRM (HESRM) associated with permanent magnets located between stator poles for electric vehicles. Firstly, the basic machine topology and operating principle are presented. The static electromagnetic characteristics of the propose…
The influence of impurities on the cold brittleness of materials is studied. A neural network is trained to model fatigue and brittle failure of samples. The neural network generates numerical sequences that evolve analogously to the fractal characteristics of acoustic emission studied in fatigue tests with various lo…
Continuous efforts to construct high-speed and lightweight ship have been made to reduce cost against growing oil prices. In this context, aluminum has received attention as an alternative material for steel, for small and medium-sized ships. In an effort to extend service life of aluminum, various researches have bee…
In order to replace rare-earth magnets five different machine topologies are considered, designed and studied in detail. With a synchronous reluctance machine (SRM) a machine without magnets is included in this comparison. The improvement by the insertion of cheap ferrite magnets in a SRM is studied by designing two d…
It is well known that anodization process is helpful for obtaining metallic oxides on the metal surfaces. The advantages of this process are used in this study to obtain rough surfaces consisting of titanium oxides and solid solutions of titanium and oxygen. Two different voltages were applied to a pure titanium foil…
This paper presents two novel three-phase modular SRMs (MSRMs) with the same segmented E-shaped stator modules and different rotor topologies, namely, segmental rotor and conventional rotor. The basic topologies and simplified equivalent magnetic circuit (EMC) are presented first. The static electromagnetic characteri…
Silicon oxide nanowires were synthesized from monosilane–argon–hydrogen mixture by the gas-jet electron-beam plasma chemical deposition method with simultaneous oxygen injection into the vacuum chamber. The synthesis was performed on monocrystalline silicon substrates covered with micron and nanometer tin catalyst par…
In this paper, we consider the Potts model with competing interactions on the Cayley tree of order three. We give the Potts model on the Cayley tree and its recursion relation. We construct the Gibbs states corresponding to the model by using Markov random field method. We calculate the critical curve, such that there…
Sulfacetamide complexes of Ag(I), Cu(II), and Cd(II) were synthesized and characterized by the elemental analyses and IR and 1H NMR spectra. Structural assessment revealed two modes of coordination in the sulfacetamide complexes, showing that sulfacetamide reacts as a bidentate ligand and coordinates to Ag(I) and Cd(I…
The study aims to compare the performance of two types of material HSS (High Speed Steel) are widely used. It also will be the chemical composition and distribution of carbide particles therein. Two types of HSS are available in the market: HSS from Germany (Bohler) and HSS from China. This research employed the pure…
Bulk strain energy density was numerically simulated for epoxy-phenol-based composites randomly reinforced with short polyimide fibers, with antifriction dispersed polytetrafluoroethylene (PTFE) additives. A mathematical model was constructed using the notion of a stress concentration operator (fourth-rank tensor) tha…
In this paper, two novel brushless excitation methods for wound rotor excitation synchronous generators are proposed in this paper. Compared with the electric excitation synchronous generators with an exciter, these two kinds of generators can integrate the function of the exciter into the main generator. The exciter…
An analytical electromagnetic model of a novel modular axial-flux switched reluctance machine is presented, providing details for the specific magnetic circuit of this configuration. Magnetic saturation and leakage fluxes are key factors: saturated designs lead to higher power dense switched reluctance machines in gen…
The aim of this paper is first to briefly describes a mathematical approach for the direct coupling of analytical formal solution of Maxwell's equations (AM) and magnetic equivalent circuits (MEC) (reluctance networks or permeance networks) methods for the electromagnetic modeling of electric machines. This coupling c…
The unidirectional carbon pultruded rod running through the tops of the stringers is a key design feature of the Pultruded Rod Efficient Unitized Structure (PRSEUS) concept as applied to aircraft fuselage structure. Reported herein are the test methods and results from a test campaign in which the strength of the rod/…
In the fatigue life assessment of adjustable telescopic steel prop joints subjected to cyclic loading is critical for determining the number of cycles before fatigue failure of 235GT steel materials. The research aims in this reported work were to develop a computational material model and 3D finite-element analysis m…
Results of measuring the thermal conductivity coefficient of silica dioxide Tarkosil T-50 nanopowder by a laser flash technique are reported. Experimental data on thermal conductivity of nanopowder in vacuum, in different gas media, and at different temperatures were obtained. Comparative analysis of thermal conductiv…
The paper is devoted to an analytical prediction of the force production capability of a quasi-Halbach PM excited tubular-linear synchronous machine (T-LSM). To start with, the air gap flux density is derived considering both PMs excitation and armature magnetic reaction. The no-load operation is then characterized wi…
A method is proposed for determining the decrease in the distance between nominally flat rough surfaces with similar hardness in the plastic deformation of the surface microprojections.