On replacing the line current approximation by surface currents in the Poynting vector method for the impedance of thin dipoles

2002 ◽  
Author(s):  
R.H. MacPhie ◽  
S.K. Darbha
Keyword(s):  
Poynting Vector ◽  
Surface Currents ◽  
Vector Method ◽  
Line Current ◽  
Current Approximation

scholarly journals Study of Power Flow in an IPT System Based on Poynting Vector Analysis

Energies ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 165 ◽  
Author(s):  
Yuan Liu ◽  
Aiguo Hu
Keyword(s):  
Output Power ◽  
Power Distribution ◽  
Power Flow ◽  
Poynting Vector ◽  
Current Source ◽  
Arbitrary Point ◽  
Secondary Coil ◽  
Surface Integral ◽  
Vector Method ◽  
Coupled Coils

This paper analyzes the power distribution and flow of an inductive power transfer (IPT) system with two coupled coils by using the Poynting vector. The system is modelled with a current source flowing through the primary coil, and a uniformly loaded secondary first, then the Poynting vector at an arbitrary point is analyzed by calculating the magnetic and electric fields between and around of the two coils. Both analytical analysis and numerical analysis have been undertaken to show the power distribution, and it has found that power distributes as a donut shape in three-dimensional (3D) space and concentrates along the edges in the proposed two-coil setup, instead of locating coaxially along the center path. Furthermore, power flow across the mid-plane between the two coils is analyzed analytically by the surface integral of the Poynting vector, which is compared with the input power from the primary and the output power to the secondary coil via coupled circuit theory. It has shown that for a lossless IPT system, the power transferred across the mid-plane is equal to the input and output power, which validates the Poynting vector approach. The proposed Poynting vector method provides an effective way to analyze the power distribution in the medium between two coupled coils, which cannot be achieved by traditional lumped circuit theories.

Poynting vector method: AC loss measurement of long HTS tapes or wires wound into a solenoidal-coil

2003 ◽  
Vol 13 (2) ◽  
pp. 3663-3666 ◽  
Author(s):  
F. Sumiyoshi ◽  
H. Kasahara ◽  
A. Kawagoe ◽  
K. Kubota ◽  
S. Akita
Keyword(s):  
Poynting Vector ◽  
Ac Loss ◽  
Vector Method ◽  
Loss Measurement

Axial-line-current approximation for short cylindrical wires

1978 ◽  
Vol 14 (24) ◽  
pp. 776 ◽  
Author(s):  
R. Neri ◽  
T.S.M. Maclean
Keyword(s):  
Axial Line ◽  
Line Current ◽  
Current Approximation

scholarly journals Separating a wavefield by propagation direction

Geophysics ◽  
2016 ◽  
Vol 81 (3) ◽  
pp. T117-T129 ◽  
Author(s):  
Alan Richardson ◽  
Alison E. Malcolm
Keyword(s):  
Wave Amplitude ◽  
Poynting Vector ◽  
Angular Resolution ◽  
Survey Design ◽  
Imaging Techniques ◽  
Velocity Model ◽  
Propagation Direction ◽  
Vector Method ◽  
Illumination Compensation ◽  
Amplitude Variation With Angle

Determining the propagation direction of waves in a wavefield is important in several seismic imaging techniques and applications, including velocity analysis, amplitude variation with angle analysis, survey design, and illumination compensation. This can be achieved using the Poynting vector method, but this method performs poorly when waves overlap, returning incorrect wave amplitude and direction. An alternative, the local slowness method, is capable of separating overlapping waves, but it suffers from low angular resolution. We have developed modifications of these two approaches that improve the ability to extract the wave amplitude propagating in different directions. The primary modification is the addition of a wavefront orientation separation step. We have evaluated the methods’ ability to separate six overlapping waves with different phases in a constant velocity model, to accurately determine scattering angles in the construction of an angle domain image gather, and to determine the propagation directions of the back-propagated receiver wavefield for one shot in a 2D slice of the SEAM model. We have determined that in these examples, the proposed methods produce results that are generally superior to those of the Poynting vector and local slowness methods.

A Quench Monitoring System of Superconducting Coils by Using the Poynting Vector Method

2009 ◽  
Vol 19 (3) ◽  
pp. 2341-2344 ◽  
Author(s):  
F. Sumiyoshi ◽  
A. Kawagoe ◽  
M. Tokuda ◽  
S. Kaminohara
Keyword(s):  
Monitoring System ◽  
Poynting Vector ◽  
Vector Method ◽  
Superconducting Coils

Poynting Vector Method for Reflector Beam Shaping

2019 ◽  
Vol 18 (4) ◽  
pp. 664-668
Author(s):  
Dong Xia ◽  
Ming Jin ◽  
Ming Bai
Keyword(s):  
Poynting Vector ◽  
Beam Shaping ◽  
Vector Method
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