Search results for "parameter estimation"

showing 3 items of 33 documents

Time-domain effective-one-body gravitational waveforms for coalescing compact binaries with nonprecessing spins, tides and self-spin effects

2018

We present TEOBResumS, a new effective-one-body (EOB) waveform model for nonprecessing (spin-aligned) and tidally interacting compact binaries.Spin-orbit and spin-spin effects are blended together by making use of the concept of centrifugal EOB radius. The point-mass sector through merger and ringdown is informed by numerical relativity (NR) simulations of binary black holes (BBH) computed with the SpEC and BAM codes. An improved, NR-based phenomenological description of the postmerger waveform is developed.The tidal sector of TEOBResumS describes the dynamics of neutron star binaries up to merger and incorporates a resummed attractive potential motivated by recent advances in the post-Newt…

data analysis methodneutron star: binaryGravitational waves effective-one-bodyAstronomyBinary numberFOS: Physical sciencesalternative theories of gravityGeneral Relativity and Quantum Cosmology (gr-qc)Parameter spacegravitational radiation: direct detection01 natural sciencesGeneral Relativity and Quantum CosmologyNumerical studies of other relativistic binaries; Neutron stars; black holes (astrophysics); Gravitational wavesNeutron starsGravitational wavesGravitationBinary black holebinary: coalescence0103 physical sciencesnumerical methodsblack holes (astrophysics)010306 general physicsGeneral Relativity and Quantum Cosmology; General Relativity and Quantum Cosmologyequation of statePhysics010308 nuclear & particles physicsNumerical studies of other relativistic binarieshigher-order: 0spin: effectGravitational Waves analytical template modeling LIGO Virgo numerical relativity Neutron Stars parameter estimationRadiusbinary: compactLIGOgravitational radiation detectorComputational physicsFIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICIdetector: sensitivityNeutron starNumerical relativityblack hole: binaryGeneral relativityrelativity theorygravitation: self-force[PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc]effective-one-body
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Optimization of Delayed-State Kalman-Filter-based Algorithm via Differential Evolution for Sensorless Control of Induction Motors

2010

This paper proposes the employment of the differential evolution (DE) to offline optimize the covariance matrices of a new reduced delayed-state Kalman-filter (DSKF)-based algorithm which estimates the stator-flux linkage components, in the stationary reference frame, to realize sensorless control of induction motors (IMs). The DSKF-based algorithm uses the derivatives of the stator-flux components as mathematical model and the stator-voltage equations as observation model so that only a vector of four variables has to be offline optimized. Numerical results, carried out using a low-speed training test, show that the proposed DE-based approach is very promising and clearly outperforms a cla…

evolutionary algorithms (EAs)induction-motor (IM) drivesvelocity controlspeed sensorlessProportional controlcovariance matricesKalman filteralgorithmsSliding mode controlControl and Systems EngineeringRobustness (computer science)Control theoryAC motor drivesDifferential evolutionoptimization methodsstate estimationElectrical and Electronic EngineeringRobust controlparameter estimationAlgorithmStationary Reference FrameKalman filteringInduction motorMathematics
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Sequential and joint hydrogeophysical inversion using a field-scale groundwater model with ERT and TDEM data

2013

Abstract. Increasingly, ground-based and airborne geophysical datasets are used to inform groundwater models. Recent research focuses on establishing coupling relationships between geophysical and groundwater parameters. To fully exploit such information, this paper presents and compares a joint hydrogeophysical inversion (JHI) approach and sequential hydrogeophysical inversion (SHI) approach to inform a field-scale groundwater model with Time Domain Electromagnetic (TDEM) and Electrical Resistivity Tomography (ERT) data. The implemented SHI coupled inverted geophysical models with groundwater parameters, where the strength of the coupling was based on geophysical parameter resolution. To t…

lcsh:GE1-350Hydrologylcsh:TEstimation theoryPetrophysicslcsh:Geography. Anthropology. RecreationModel parametersSoil scienceInversion (meteorology)Computer simulationlcsh:Technologylcsh:TD1-1066Geophysicslcsh:GParameter estimationElectrical resistivity tomographylcsh:Environmental technology. Sanitary engineeringGroundwater modelGroundwaterlcsh:Environmental sciencesGroundwaterGeologySlightly worse
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