Search results for "Transform"

showing 10 items of 3975 documents

An induction motor speed measurement based on current harmonic analysis with Chirp-Z Transform

2002

The paper presents a new method to measure motor speed by means of frequency estimation of rotor slot harmonics present in the supply current of squirrel single cage induction motors. The novelty of the method is the use of Chirp-Z Transform as supply current harmonic analysis. The advantages are an improved spectral resolution and accuracy. Moreover a shorter sampling time window is required reducing errors related to not stationary current signal. Experimental results are presented to validate the proposed method and to perform a comparison with FFT based one.

EngineeringRotor (electric)business.industryBluestein's FFT algorithmFast Fourier transformSignallaw.inventionHarmonic analysislawHarmonicsChirpElectronic engineeringbusinessInduction motorIMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in the Age of Informatics (Cat. No.01CH 37188)
researchProduct

The impact of fixed and moving scatterers on the statistics of MIMO vehicle-to-vehicle channels

2021

©2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Article also available from publisher: http://dx.doi.org/10.1109/VETECS.2009.5073879 In this paper, we study the impact of fixed and moving clusters of scatterers on the statistics of multiple- input multiple-output (MIMO) vehicle-to-vehicle (V2V) channels. Double-bounce scattering is assumed for fixed scatterers, while single-bounce scattering is considered fo…

EngineeringScatteringbusiness.industryAutocorrelationMIMOFunction (mathematics)Space (mathematics)Vehicle-to-vehicleExpression (mathematics)Current transformerStatisticsVDP::Technology: 500::Information and communication technology: 550::Telecommunication: 552businessComputer Science::Information Theory
researchProduct

Oxidation of secondary alcohols by duckweed: A biotransformation experiment for undergraduate students

1988

EngineeringScience instructionHigher educationChemical engineeringBiotransformationbusiness.industryEnvironmental chemistryGeneral ChemistrybusinessScience educationEducationBiophysical chemistryJournal of Chemical Education
researchProduct

A small scale prototype of a wave energy conversion system for hydrogen production

2015

In this paper a small scale prototype of sea wave energy converter for hydrogen production and storage is presented. Laboratory prototypes of the wave energy converter device and sea water electrolyzer are presented. Experimental results are shown. A cost-effective and efficient power electronics system is designed. Experimental waveforms of the wave energy converter are imported in the power electronics simulation model to simulate the whole system as closely as possible to its effective behavior. Simulation results are shown to test the efficiency of the proposed solution.

EngineeringSettore ING-IND/11 - Fisica Tecnica AmbientaleScale (ratio)Hydrogenbusiness.industryMechanical engineeringchemistry.chemical_elementsystemSettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciIndustrial and Manufacturing EngineeringMagnetic fluxWhole systemschemistryhydrogenPower electronicsWaveformEnergy transformationElectrical and Electronic Engineeringbusinesswave energyHydrogen productionIECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
researchProduct

PMSM Drives Sensorless Position Control with Signal Injection and Neural Filtering

2009

Vector Field Oriented Control (FOC) is one of the best control methods for high-dynamic electrical drives. To avoid the adoption of the speed/position sensor (resolver/encoder), a sensorless technique should be used. Among the various sensorless methods in literature, those based on machine saliency detection by signal injection seem to be most useful for thier giving the possibility of closing the position control loop. This paper proposes a method for enhancing both rotating and pulsating voltage carrier injection methods by a neural adaptive band filter. Results show the goodness of the proposed solution.

EngineeringSignal processingVector controlArtificial neural networkbusiness.industryFilter (signal processing)neural networksCurrent transformerControl theoryResolverElectronic engineeringPMSMsensorless controlbusinesssignal processingEncoderPosition sensor
researchProduct

Low stiffness variation in structural systems: identification and localization

2008

When a very low damage occurs, the undamaged structural response totally overlaps the damaged one either in time domain or in frequency domain; on the other hand, by considering some characteristics of the analytical signal, such as the phase, it has been possible to develop a damage identification procedure that allows the identification and localization of damage even if the structure experiences multiple damages at the same time. This procedure is also robust with respect to the presence of measuring noise. In order to assess the validity of the proposed damage identification procedure, numerical applications on single degree of freedom and 2 DOF and 4 DOF are presented using data record…

EngineeringStructural systemSignallocalizationHilbert transformsymbols.namesakeControl theorymedicineTime domainCivil and Structural Engineeringanalytical signalbusiness.industryStiffnessBuilding and ConstructionStructural engineeringdamage identificationNoiseIdentification (information)Settore ICAR/09 - Tecnica Delle CostruzioniMechanics of MaterialsFrequency domainsymbolsmeasuring noiseHilbert transformmedicine.symptombusinessSettore ICAR/08 - Scienza Delle Costruzioni
researchProduct

Design issues for wind farms grid tied Inverter

2017

In this paper the Authors give indications for the design of a grid tied Voltage Source Inverters (VSI) aimed to optimal use in energy conversion from wind source. In particular, the design of the inverter is more focused on the control system planning, with a particular glance on the grid synchronization problem. After the exposition of general issues concerning renewable energies and associated topics, the case of a grid tied inverter is considered and a methodology of design is sketched starting from the consideration of the DC side and also considering the power device losses, the protection issue against over voltages and over-currents, snubber circuits, heat sinks and, finally the con…

EngineeringSustainability and the Environmentbusiness.industry020209 energy020208 electrical & electronic engineeringElectrical engineering02 engineering and technologySettore ING-IND/32 - Convertitori Macchine E Azionamenti ElettriciGridwind farms inverter design control systemPower (physics)Renewable energyRenewable Energy Sustainability and the Environment; Automotive Engineering; Electrical and Electronic EngineeringSettore ING-IND/33 - Sistemi Elettrici per L'EnergiaControl systemAutomotive Engineering0202 electrical engineering electronic engineering information engineeringElectronic engineeringSnubberEnergy transformationInverterRenewable EnergyVoltage sourceElectrical and Electronic Engineeringbusiness2017 Twelfth International Conference on Ecological Vehicles and Renewable Energies (EVER)
researchProduct

Medium Voltage Smart Grid: Experimental Analysis of Secondary Substation Narrow Band Power Line Communication

2013

This paper is focused on the possibility of employing narrow band power line communication (PLC) in medium voltage (MV) distribution networks. The topic is investigated by means of both simulations and experimental tests, which were carried out in the distribution network of Ustica Island. In detail, a two-way MV communication was tested between two secondary substations connected by an MV cable power line. Each substation has a by-pass connection at MV bus-bars and an MV/LV oil filled power transformer. In this paper, the MV and the PLC systems under test are described and the experimental tests are presented, which were carried out to evaluate the parameters of the simulation model. The a…

EngineeringSwitched-mode power supplyPower system communicationPower line communicationsSmart gridPower transformersPower factorEquipment testingCommunication systemsSmart power gridsElectronic engineeringElectrical and Electronic EngineeringInstrumentationElectric power distributionbusiness.industryCommunicationElectrical engineeringAttenuationComputer simulationPower (physics)Power-line communicationElectric power transmissionPower system measurementCommunication equipment testingPower engineeringbusinessAttenuation communication equipment testing communication systems narrow band power line communication power system communication power system measurements smart gridsSettore ING-INF/07 - Misure Elettriche E ElettronicheVoltageIEEE Transactions on Instrumentation and Measurement
researchProduct

Multiresolution wavelet-based approach to identification of modal parameters of a vehicle full-scale crash test

2012

In this work estimation of vehicle modal parameters was achieved by application of a wavelet-based method. The time-frequency analysis, which comprises those techniques that study a signal in both the time and frequency domains simultaneously, using Morlet wavelet properties are applied to the measured acceleration pulse of the colliding vehicle. Determination of the ridge of the wavelet coefficients matrix makes it possible to identify the frequency components of the recorded crash pulse. Subsequently, by using the estimated natural frequency of the system, the values of damping factor for a given mode shape are assessed. In this work there are concerned both: the major frequencies of the …

EngineeringWaveletMorlet waveletbusiness.industryEstimation theoryAcousticsModal analysisElectronic engineeringWavelet transformNatural frequencybusinessCrash testTime–frequency analysis2012 IEEE International Symposium on Intelligent Control
researchProduct

Calculation of self and mutual inductances and 3-D magnetic fields of chokes with air gaps in core

2001

This work deals with the analysis of 3-D magnetic field in electric choke (reactor) with two windings. The analysis is related to the solutions of Laplace's and Poisson's equation by the Finite Element Method. The package OPERA-3d has been used. The self and mutual inductances of windings, which are connected in series aiding as well as in series opposing, have been determined. The calculation results of magnetic flux density components and the inductances are compared with the measured values.

EngineeringWork (thermodynamics)Series (mathematics)Laplace transformbusiness.industryApplied MathematicsElectrical engineeringChokeMechanicsFinite element methodMagnetic fluxMagnetic fieldElectromagnetic coilElectrical and Electronic EngineeringbusinessElectrical Engineering (Archiv fur Elektrotechnik)
researchProduct