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A generic impedance modeling technique
AEU - International Journal of Electronics and Communications, 2020Abstract In this work, a generic impedance modeling technique is proposed. The technique is able to identify a circuit model that is most suitable for fitting measured impedance magnitude data using a genetic algorithm solver as well as the optimum circuit model parameters.
Abdulwadood Al-Ali +3 more
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Railway lines models for impedance evaluation
8th International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.98EX227), 2002This paper deals with modeling of electrified railway lines using the multiconductor transmission lines (MTLs) approach, in order to investigate the harmonic impedance seen at the train pantograph at various locations along the line. A railway line model has been studied and a sensitivity analysis with respect to the structure of the model has been ...
P. Ferrari, POZZOBON, PAOLO
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Electrode Modelling in Electrical Impedance Tomography
SIAM Journal on Applied Mathematics, 1992Summary: In electrical impedance tomography, measurements of an applied electrical current and the corresponding electrical potential are made on a finite number of electrodes placed on the boundary of an object. These measurements are then used to reconstruct the electrical conductivity distribution in the interior of the object.
Paulson, Kevin +2 more
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The Impedance of Curved Artery Models
Journal of Biomechanical Engineering, 1983The impedance (pressure drop/flow rate) of four curved artery models has been determined experimentally for steady and periodic flows simulating conditions in the aortic arch. Steady flow results indicate that very short entry lengths are required for flow development in curved artery models, and impedance is elevated above straight tube values by a ...
S G, Kang, J M, Tarbell
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Simplified Impedance Model for Adhesively Bonded Piezo-Impedance Transducers
Journal of Aerospace Engineering, 2009The electromechanical impedance technique employs surface-bonded lead zirconate titanate piezoelectric ceramic patches as impedance transducers for structural health monitoring and nondestructive evaluation. The patches are bonded to the monitored structures using finitely thick adhesive bond layer, which introduces shear lag effect, thus invariably ...
Suresh Bhalla +3 more
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The Proton Synchrotron Transverse impedance model
2014The current knowledge of the transverse impedance of the CERN Proton Synchrotron (PS) has been established by theoretical computations, electromagnetic simulations and beam-based measurements at different energies. The transverse coherent tune and phase advance shifts as a function of intensity have been measured in order to evaluate the total ...
PERSICHELLI, SERENA +5 more
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European Journal of Physics, 2015
Impedance models of pipes can be used to estimate resonant frequencies of standing waves and model acoustic pressure of closed and open ended pipes. Modelling a pipe with impedance methods allows additional variations to the pipe to be included in the overall model as a system.
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Impedance models of pipes can be used to estimate resonant frequencies of standing waves and model acoustic pressure of closed and open ended pipes. Modelling a pipe with impedance methods allows additional variations to the pipe to be included in the overall model as a system.
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Impedance magnetocardiography: Experiments and modeling
Journal of Applied Physics, 2004We report on impedance magnetocardiography studies using high-Tc superconducting quantum interference device (SQUID) magnetometers in a partially shielded environment. The SQUID detects magnetic-field variations due to impedance changes in the thorax at 15kHz.
J. R. Claycomb +3 more
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Assessing nonlinearity in impedance models
Journal of Electroanalytical Chemistry, 1995Abstract A procedure for assessing nonlinearity in impedance or admittance models which is based on modern nonlinear regression analysis is described. The nonlinearity of a model can be separated into two components: (1) “intrinsic” nonlinearity and (2) “parametric” nonlinearity.
Xizun Wu, Wenzhi Zhang
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2000
Although the perfectly conducting ground model is adequate for many applications, it is not universally applicable. A more accurate model is required for surface wave propagation, for correct modelling of reflection effects at vertical polarization or for the modelling of propagation over rough surfaces.
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Although the perfectly conducting ground model is adequate for many applications, it is not universally applicable. A more accurate model is required for surface wave propagation, for correct modelling of reflection effects at vertical polarization or for the modelling of propagation over rough surfaces.
openaire +1 more source