Search results for "frequency-domain analysis"

showing 4 items of 4 documents

Multipactor radiation analysis within a waveguide region based on a frequency-domain representation of the dynamics of charged particles

2009

[EN] A technique for the accurate computation of the electromagnetic fields radiated by a charged particle moving within a parallel-plate waveguide is presented. Based on a transformation of the time-varying current density of the particle into a time-harmonic current density, this technique allows the evaluation of the radiated electromagnetic fields both in the frequency and time domains, as well as in the near- and far-field regions. For this purpose, several accelerated versions of the parallel-plate Green's function in the frequency domain have been considered. The theory has been successfully applied to the multipactor discharge occurring within a two metal-plates region. The proposed…

electromagnetic fieldsMultipactor effectElectromagnetic fieldcurrent densityImage theoryGreens-FunctionElectrodynamicsAcceleratorelectrodynamicsFinite difference time-domain analysisElectromagnetic radiationmicrowave switchesGreen's function methodslaw.inventionPeriodic StructuresOpticsBreakdownCurrent densitylawTEORIA DE LA SEÑAL Y COMUNICACIONESGreen's functionsFrequency-domain analysisfinite difference time-domain analysisEwald MethodPhysicsTeoría de la Señal y las Comunicaciones2-Dbusiness.industryElectromagnetic fieldsMicrowave switcheswaveguidesParallel plate waveguideCharged particleComputational physicsfrequency-domain analysisTransformation (function)Frequency domainModesDischarge3325 Tecnología de las TelecomunicacionesMultipactor effectbusinessWake-FieldWaveguidesWaveguideCurrent densitySimulationPhysical Review E
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Measuring High-Order Interactions in Rhythmic Processes Through Multivariate Spectral Information Decomposition

2021

Many complex systems in physics, biology and engineering are modeled as dynamical networks and described using multivariate time series analysis. Recent developments have shown that the emergent dynamics of a network system are significantly affected by interactions involving multiple network nodes which cannot be described using pairwise links. While these higher-order interactions can be probed using information-theoretic measures, a rigorous framework to describe them in the frequency domain is still lacking. This work presents an approach for the spectral decomposition of multivariate information measures, capable of identifying higher-order synergistic and redundant interactions betwee…

Brain modelingMultivariate statisticsTechnology and EngineeringGeneral Computer ScienceTime series analysiComplex systemTIME-SERIESHEART-RATETime series analysisEEG analysisInformation theoryMOTOR IMAGERYMatrix decompositionCouplingFrequency-domain analysiRedundancyelectronic oscillatorsRedundancy (engineering)General Materials ScienceNETWORKTime domainFrequency-domain analysissignal processingTEMPERATUREParametric statisticsinformation theoryPhysicsFEEDBACKGeneral Engineeringclimate dynamicsTime measurementspectral analysisTK1-9971Mathematics and Statisticshigh-order interactionsconnectivityFrequency domainCouplingsElectrical engineering. Electronics. Nuclear engineeringBiological systeminformation dynamicsCoherenceIEEE Access
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Rotor-bar breakage mechanism and prognosis in an induction motor

2015

© 1982-2012 IEEE. This paper proposes a condition-based maintenance and prognostics and health management (CBM/PHM) procedure for a rotor bar in an induction motor. The methodology is based on the results of a fatigue test intended to reproduce in the most natural way a bar breakage in order to carry out a comparison between transient and stationary diagnosis methods for incipient fault detection. Newly developed techniques in stator-current transient analysis have allowed tracking the developing fault during the last part of the test, identifying the failure mechanism, and establishing a physical model of the process. This nonlinear failure model is integrated in a particle filtering algor…

EngineeringFailure analysisBar (music)particle filtersremaining life assessmentFault (power engineering)Fault detection and isolationlaw.inventionlawspectrograminduction motorsElectrical and Electronic EngineeringSpectrogramFatigueFault diagnosisbusiness.industryRotor (electric)prognostics and health management (PHM)Prognostics and health management (PHM)Structural engineeringfault diagnosisfrequency-domain analysisrotorsInduction motorsControl and Systems EngineeringRotorsPrognosticsRemaining life assessmentINGENIERIA ELECTRICAfatigueTransient (oscillation)Particle filtersbusinessParticle filterInduction motor
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Spectral analysis of the beat-to-beat variability of arterial compliance

2022

Arterial compliance is an important parameter influencing ventricular-arterial coupling, depending on structural and functional mechanics of arteries. In this study, the spontaneous beat-to-beat variability of arterial compliance was investigated in time and frequency domains in thirty-nine young and healthy subjects monitored in the supine resting state and during head-up tilt. Spectral decomposition was applied to retrieve the spectral content of the time series associated to low (LF) and high frequency (HF) oscillatory components. Our results highlight: (i) a decrease of arterial compliance with tilt, in agreement with previous studies; (ii) an increase of the LF power content concurrent…

Settore ING-INF/06 - Bioingegneria Elettronica E InformaticaCouplings Frequency-domain analysis Time series analysis Biomedical monitoring Heart rate variability2022 12th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO)
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