Search results for "MAC"

showing 10 items of 24950 documents

Analytical description of solid particles kinematics due to a fluid flow and application to the depiction of characteristic kinematics in cold sprayi…

2017

Abstract In several multiphase flow applications such as fluidization, thermal spraying, atomization manufacturing and so on, the Newton's law is widely enacted to formulate the particle/fluid kinematic interaction and then to compute particles kinematics. This paper provides analytical solutions of the Newton's law in its time-dependent formulation or simplified formulation, the latter being a reduction of the time dependent problem into a spatial description of the particle motion. It was found that the velocity solution is strictly similar in both cases so that the simplified formulation is viable. The W_ 1 branch of the Lambert's function yields the analytical particle residence time an…

010302 applied physicsChemistryGeneral Chemical EngineeringMultiphase flow02 engineering and technologyMechanicsKinematics021001 nanoscience & nanotechnologyResidence time (fluid dynamics)01 natural sciencessymbols.namesakeMach number0103 physical sciencesFluid dynamicssymbolsParticleParticle velocity0210 nano-technologyMagnetosphere particle motionPowder Technology
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A General Mathematical Formulation for the Determination of Differential Leakage Factors in Electrical Machines with Symmetrical and Asymmetrical Ful…

2018

This paper presents a simple and general mathematical formulation for the determination of the differential leakage factor for both symmetrical and asymmetrical full and dead-coil windings of electrical machines. The method can be applied to all multiphase windings and considers Gorges polygons in conjunction with masses geometry in order to find an easy and affordable way to compute the differential leakage factor, avoiding the adoption of traditional methods that refer to the Ossanna's infinite series, which has to be obviously truncated under the bound of a predetermined accuracy. Moreover, the method described in this paper allows the easy determination of both the minimum and maximum v…

010302 applied physicsComputer scienceconcentrated winding020208 electrical & electronic engineering02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciTopology01 natural sciencesdifferential leakage factorIndustrial and Manufacturing EngineeringHarmonic analysismoment of inertiaControl and Systems EngineeringElectromagnetic coil0103 physical sciences0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringAsymmetrical windingdead-coil windingGörges polygonmultiphase windingsLeakage (electronics)
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Determination of differential leakage factors in electrical machines with non-symmetrical full and dead-coil windings

2017

In this paper Gorges polygons are used in conjunction with masses geometry to find an easy and affordable way to compute the differential leakage factor of non symmetrical full and dead coil winding. By following the traditional way, the use of the Ossanna's infinite series which has to be obviously truncated under the bound of a predetermined accuracy is mandatory. In the presented method no infinite series is instead required. An example is then shown and discussed to demonstrate practically the effectiveness of the proposed method.

010302 applied physicsConcentrated windingSettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesDifferential leakage factorwindingsmoment of inertiaControl theoryElectromagnetic coil0103 physical sciencesunsymmetrical windingGörges polygonLeakage (electronics)Mathematics
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Maximum Torque Per Ampere control algorithm for low saliency ratio interior permanent magnet synchronous motors

2017

This paper presents an investigation on the comparison between the Maximum Torque Per Ampere (MTPA) and the Field Orientation Control (FOC) algorithms for interior permanent magnet synchronous machines (IPMSMs). In particular, this study was carried out on a small-power IPMSM with low salience ratio. Both control algorithms have been implemented in the Matlab/Simulink environment, obtaining promising results.

010302 applied physicsControl algorithmMaximum torque per ampere control algorithmPermanent magnet synchronous motorComputer scienceRenewable Energy Sustainability and the Environment020208 electrical & electronic engineeringEnergy Engineering and Power Technology02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti Elettrici01 natural sciencesField oriented control algorithmField orientationSalience (neuroscience)Control theoryMagnet0103 physical sciences0202 electrical engineering electronic engineering information engineeringInterior permanent magnet synchronous machineMATLABAmperecomputerMaximum torquecomputer.programming_language
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Early detection and classification of bearing faults using support vector machine algorithm

2017

Bearings are one of the most critical elements in rotating machinery systems. Bearing faults are the main reason for failures in electrical motors and generators. Therefore, early bearing fault detection is very important to prevent critical system failures in the industry. In this paper, the support vector machine algorithm is used for early detection and classification of bearing faults. Both time and frequency domain features are used for training the support vector machine learning algorithm. The trained classier can be employed for real-time bearing fault detection and classification. By using the proposed method, the bearing faults can be detected at early stages, and the machine oper…

010302 applied physicsElectric motorEngineeringBearing (mechanical)business.industry020208 electrical & electronic engineeringFeature extractionPattern recognition02 engineering and technology01 natural sciencesFault detection and isolationlaw.inventionSupport vector machineStatistical classificationlawFrequency domain0103 physical sciences0202 electrical engineering electronic engineering information engineeringArtificial intelligencebusinessTest data2017 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)
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An exact method for the determination of differential leakage factors in electrical machines with non-symmetrical windings

2016

An exact and simple method for the determination of differential leakage factors in polyphase ac electrical machines with non-symmetrical windings is presented in this paper. The method relies on the properties of Gorges polygons that are used to transform an infinite series expressing the differential leakage factor into a finite sum in order to significantly simplify the calculations. Some examples are shown and discussed in order to practically demonstrate the effectiveness of the proposed method.

010302 applied physicsElectronic Optical and Magnetic Material020208 electrical & electronic engineering02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciTopology01 natural sciencesElectronic mailElectronic Optical and Magnetic MaterialsDifferential leakage factorHarmonic analysiswindingDistribution functionmoment of inertiaElectromagnetic coil0103 physical sciences0202 electrical engineering electronic engineering information engineeringPolyphase systemGraphical modelnon-symmetrical windingElectrical and Electronic EngineeringGörges polygonLeakage (electronics)Mathematics
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Formation of dislocations and hardening of LiF under high-dose irradiation with 5–21 MeV 12C ions

2017

R. Zabels, I. Manika, J. Maniks, and R.Grants acknowledge the national project IMIS2, and A. Dauletbekova, M. Baizhumanov, and M. Zdorovets the Ministry of Education and Science of the Republic of Kazakhstan for the financial support.

010302 applied physicsEnergy lossMaterials sciencePhysics::Instrumentation and DetectorsAtomic force microscopyAstrophysics::High Energy Astrophysical PhenomenaPhysics::Medical Physicsmacromolecular substances02 engineering and technologyGeneral ChemistryNanoindentation021001 nanoscience & nanotechnology01 natural sciencesMolecular physicsIsotropic etchingElastic collisionIonPhysics::Plasma Physics0103 physical sciences:NATURAL SCIENCES:Physics [Research Subject Categories]Hardening (metallurgy)General Materials ScienceIrradiationAtomic physics0210 nano-technologyApplied Physics A
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A Magnetohydrodynamic Auxiliary Propulsion system for docking assistance of autonomous vehicle

2016

In this article we present an approach to the description of Magnetohydrodynamic Auxiliary Propulsion system for docking assistance of autonomous vehicle. Preliminarily, an analytical model which includes an electromagnetic model and a thermal model is presented. Successively, in order to move beyond the analytical model, a 3-D MHD modeling tool and a Runge Kutta method based solver are presented and they are used to investigate an alternative MHD solutions. Some numerical analysis are given

010302 applied physicsEngineeringbusiness.industryNumerical analysis05 social sciencesControl engineeringOcean EngineeringSolverPropulsionSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciOceanography01 natural sciencesRunge–Kutta methodsMagnetohydrodinamic Propulsion SystemSettore ING-INF/04 - AutomaticaPhysics::Space Physics0502 economics and business0103 physical sciencesMagnetohydrodynamic driveElectromagnetic modelMagnetohydrodynamicsThermal modelbusinessInstrumentation050203 business & management
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The helicoidal magnetic generator

2016

Recently helicoidal generator for the exploitation of sea wave energy has been proposed. This device can convert both the vertical and rotational movement of seawaves. The electrical energy generated by such a device must be converted and conditioned in order to match the instantaneous utility requirements and a power link from the sea to an interconnection is needed. In this paper, the authors propose a mathematical model of this device and preliminarily present a prototype of the machine.

010302 applied physicsInterconnectionEngineeringbusiness.industryLinear asynchronous generatorElectric potential energy05 social sciencesElectrical engineeringOcean EngineeringPermanent magnet synchronous generatorElectric machineSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciInductorOceanography01 natural sciencesPower (physics)Generator (circuit theory)Electromagnetic coil0502 economics and business0103 physical sciencesbusinessInstrumentation050203 business & managementEnergy (signal processing)Sea waves energy
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Laser Ultrasonics Inspection for Defect Evaluation on Train Wheel

2019

Abstract Passengers’ safety and in-service life of wheelset axles play an important role in railway vehicles. For this reason, periodic inspections are necessary. Among non-destructive techniques, ultrasonic ones are widely applied in this field. The main disadvantage of conventional ultrasonic techniques is that the overall inspection of wheels requires the train to be put out-of-service and disassembly each part, which is time-consuming and expensive. In this paper, a non-conventional non-contact laser ultrasonic inspection for train wheels is proposed. The proposed method uses a laser interferometer to receive the ultrasonic wave without contact. The receiving system allows choosing the …

010302 applied physicsLaser ultrasonicsUltrasonic applications Ultrasonic waves Laser ultrasonicsComputer scienceMechanical EngineeringAcousticsUltrasonic testingNon-destructive testing Non-contact techniques Laser ultrasonic Train wheel inspectionCondensed Matter PhysicsLaser01 natural scienceslaw.inventionAxleInterferometrySettore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineComplex geometrylaw0103 physical sciencesGeneral Materials ScienceUltrasonic sensor010301 acousticsReliability (statistics)
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