Low-frequency Electromagnetic Coupling Between a Traction Line and an Underground Pipeline in a Multilayered Soil

2020 ◽  
Author(s):  
Amauri G. Martins-Britto ◽  
Caio M. Moraes ◽  
Felipe V. Lopes ◽  
Sebastien Rondineau
Keyword(s):  
Electromagnetic Coupling ◽  
Low Frequency ◽  
Underground Pipeline

scholarly journals Indications of Ground-based Electromagnetic Observations to A Possible Lithosphere–Atmosphere–Ionosphere Electromagnetic Coupling before the 12 May 2008 Wenchuan MS 8.0 Earthquake

Atmosphere ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 355 ◽  
Author(s):  
Mei Li ◽  
Jun Lu ◽  
Xuemin Zhang ◽  
Xuhui Shen
Keyword(s):  
Electromagnetic Coupling ◽  
Conjugate Point ◽  
Low Frequency ◽  
Evolutionary Process ◽  
Ionospheric Disturbances ◽  
Electrical Field ◽  
Opposite Hemisphere ◽  
Epicentral Area ◽  
Electromagnetic Disturbances ◽  
Wenchuan Ms 8.0 Earthquake

A large number of various precursors have been reported since the Wenchuan MS 8.0 earthquake (EQ) took place on 12 May 2008 in China. In this work, previous investigations of both ground-based electromagnetic (EM) parameters and spatial ionospheric parameters were first examined. The statistical results showed that various anomalies presented different time-scale variations but tended to be characterized by a common feature – reaching their climax on 9 May, three days before the Wenchuan event, which indicates a lithosphere–atmosphere–ionosphere (LAI) electromagnetic coupling. Second, the fluctuations on 9 May based on the observational ground-based ultra low frequency (ULF) electrical field at the Gaobeidian (GBD) station and the direct current/ultra low frequency (DC–ULF) geomagnetic vertical Z field at the Chengdu (CD) station were comparably analyzed with those of ionospheric disturbances reported previously. The results showed that distinct electromagnetic changes, geomagnetic “double low-point” phenomena, and ionospheric disturbances above both sides of the Earth started in turn, respectively, but reached their climax simultaneously within dozens of hours on 9 May. This evolutionary process increases the probability that electromagnetic energy propagates from the epicentral area, via the atmosphere and ionosphere, to the equatorial plane, and through this plane finally to its magnetically conjugated area in the opposite hemisphere, causing electromagnetic disturbances on the Earth’s surface, in the atmosphere, and in the ionosphere and its conjugate point, in that order.

EM COUPLING, ITS INTRINSIC VALUE, ITS REMOVAL AND THE CULTURAL COUPLING PROBLEM

Geophysics ◽  
1975 ◽  
Vol 40 (5) ◽  
pp. 831-850 ◽  
Author(s):  
Jeffrey C. Wynn ◽  
Kenneth L. Zonge
Keyword(s):  
Electromagnetic Induction ◽  
Electromagnetic Coupling ◽  
Intrinsic Value ◽  
Low Frequency ◽  
Induced Polarization ◽  
Electrode Polarization ◽  
Electrically Conductive ◽  
Coupling Problem ◽  
Complex Resistivity ◽  
Deep Sounding

The induced polarization method of geophysical prospecting has been in use for more than 25 years with varying degrees of success. Until recently, its two principle drawbacks were (1) the inability to distinguish between anomalous rock responses and, (2) inability to distinguish between these rock responses and inductive coupling. The first problem was solved by K. L. Zonge in 1972. Solutions to the coupling problem go back to 1932, and have been expanded and elaborated upon by successive authors since then. In most of these papers, electromagnetic coupling was separated into two functions, here designated as P, a purely inductive term, and Q, a grounding or purely resistive term. This paper extends this work into a study of the reflective coupling contribution and the effects of anisotropy. Two immediate results are: (a) the development of an ultra‐low‐frequency deep sounding technique for highly conductive overburden environments, and (b) a successful iterative technique for the removal of coupling from complex resistivity field data. A study was made of the effect of electrically conductive pipelines on induced polarization and complex resistivity data. It appears that the so‐called “pipeline effect” is a composite of several effects, including current focusing nonlinearities, electromagnetic induction, and complex electrode polarization. The pipeline effect is generally predictable, while the effect of a fence or an irregular conductive inhomogeneity is not as simple.

Research and Design for Three-Axis Electromagnetic Leakage Detector

2012 ◽  
Vol 241-244 ◽  
pp. 223-226
Author(s):  
Jiang Shan Qian ◽  
Zhong Ran Zhou ◽  
Yu Wang ◽  
Tong Guang Shao ◽  
Jin Bo Zhang
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Coupling ◽  
Low Frequency ◽  
Electrical Equipment ◽  
Electronic Products ◽  
Total Magnetic Field ◽  
Leakage Magnetic Field ◽  
Measurement Experiment ◽  
Research And Design ◽  
The Magnetic Field

In order to measure the magnetic field around electronic products, household appliances and industrial electrical equipment, this paper puts forward a new method which makes use of electromagnetic coupling design based on three-axis electromagnetic leakage. This method can overcome the disadvantage of traditional single-axis measurement which needs to get the total magnetic field after several times’ measurement. This paper designs three-axis electromagnetic leakage detector for circuit measurement, which is proved to be correct after circuit measurement experiment. It can easily detect 30-2K Hz leakage magnetic field of low frequency generated from electrical appliances products.Introduction.

scholarly journals A Topology-Based Approach to Improve Vehicle-Level Electromagnetic Radiation

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 364 ◽  
Author(s):  
Cunxue Wu ◽  
Feng Gao ◽  
Hanzhe Dai ◽  
Zilong Wang
Keyword(s):  
Complex System ◽  
Electromagnetic Radiation ◽  
Electric Vehicle ◽  
Electromagnetic Compatibility ◽  
Electromagnetic Coupling ◽  
Low Frequency ◽  
Experimental Results ◽  
Analysis Method ◽  
Network Parameters ◽  
Radiated Emissions

The popularity of the electric vehicle (EV) brings us many challenges of electromagnetic compatibility (EMC). Automotive manufacturers are obliged to keep their products in compliance with EMC regulations. However, the EV is a complex system composed of various electromagnetic interferences (EMI), sensitive equipment and complicated coupling paths, which pose great challenges to the efficient troubleshooting of EMC problems. This paper presents an electromagnetic topology (EMT) based model and analysis method for vehicle-level EMI prediction, which decomposes an EV into multi-subsystems and transforms electromagnetic coupling paths into network parameters. This way, each part could be modelled separately with different technologies and vehicle-level EMI was able to be predicted by algebra calculations. The effectiveness of the proposed method was validated by comparing predicted vehicle-radiated emissions at low frequency with experimental results, and application to the troubleshooting of emission problems.

scholarly journals A Piezo-Electromagnetic Coupling Multi-Directional Vibration Energy Harvester Based on Frequency Up-Conversion Technique

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 80 ◽  
Author(s):  
Ge Shi ◽  
Junfu Chen ◽  
Yansheng Peng ◽  
Mang Shi ◽  
Huakang Xia ◽  
...  
Keyword(s):  
Cantilever Beam ◽  
Permanent Magnets ◽  
Energy Harvester ◽  
Electromagnetic Coupling ◽  
Low Frequency ◽  
Human Motion ◽  
Vibration Energy ◽  
Cantilever Beams ◽  
Load Range ◽  
Vibration Energy Harvester

Harvesting vibration energy to power wearable devices has become a hot research topic, while the output power and conversion efficiency of a vibration energy harvester with a single electromechanical conversion mechanism is low and the working frequency band and load range are narrow. In this paper, a new structure of piezoelectric electromagnetic coupling up-conversion multi-directional vibration energy harvester is proposed. Four piezoelectric electromagnetic coupling cantilever beams are installed on the axis of the base along the circumferential direction. Piezoelectric plates are set on the surface of each cantilever beam to harvest energy. The permanent magnet on the beam is placed on the free end of the cantilever beam as a mass block. Four coils for collecting energy are arranged on the base under the permanent magnets on the cantilever beams. A bearing is installed on the central shaft of the base and a rotating mass block is arranged on the outer ring of the bearing. Four permanent magnets are arranged on the rotating mass block and their positions correspond to the permanent magnets on the cantilever beams. The piezoelectric cantilever is induced to vibrate at its natural frequency by the interaction between the magnet on cantilever and the magnets on the rotating mass block. It can collect the nonlinear impact vibration energy of low-frequency motion to meet the energy harvesting of human motion.

scholarly journals Analysis of Bifurcation Behavior of a Piecewise Linear Vibrator with Electromagnetic Coupling for Energy Harvesting Applications

2014 ◽  
Vol 24 (05) ◽  
pp. 1450066 ◽  
Author(s):  
A. El Aroudi ◽  
H. Ouakad ◽  
L. Benadero ◽  
M. Younis
Keyword(s):  
Energy Harvesting ◽  
State Space ◽  
Electromagnetic Coupling ◽  
Piecewise Linear ◽  
Computing Time ◽  
Dynamical Behavior ◽  
Low Frequency ◽  
Frequency Domain Analysis ◽  
Harmonic Excitation ◽  
Low Frequencies

Recently, nonlinearities have been shown to play an important role in increasing the extracted energy of vibration-based energy harvesting systems. In this paper, we study the dynamical behavior of a piecewise linear (PWL) spring-mass-damper system for vibration-based energy harvesting applications. First, we present a continuous time single degree of freedom PWL dynamical model of the system. Different configurations of the PWL model and their corresponding state-space regions are derived. Then, from this PWL model, extensive numerical simulations are carried out by computing time-domain waveforms, state-space trajectories and frequency responses under a deterministic harmonic excitation for different sets of system parameter values. Stability analysis is performed using Floquet theory combined with Filippov method, Poincaré map modeling and finite difference method (FDM). The Floquet multipliers are calculated using these three approaches and a good concordance is obtained among them. The performance of the system in terms of the harvested energy is studied by considering both purely harmonic excitation and a noisy vibrational source. A frequency-domain analysis shows that the harvested energy could be larger at low frequencies as compared to an equivalent linear system, in particular, for relatively low excitation intensities. This could be an advantage for potential use of this system in low frequency ambient vibrational-based energy harvesting applications.

Effects of pipelines on spectral induced‐polarization surveys

Geophysics ◽  
1984 ◽  
Vol 49 (11) ◽  
pp. 1979-1992 ◽  
Author(s):  
Jorge O. Parra
Keyword(s):  
Electromagnetic Coupling ◽  
Low Frequency ◽  
Electrode Array ◽  
Interfacial Polarization ◽  
Skin Depth ◽  
External Observer ◽  
Array Configuration ◽  
Data Distortion ◽  
Arbitrary Position ◽  
Induced Currents

The formal electromagnetic coupling solution for a dipole-dipole electrode array configuration has been modified to include cultural coupling in a uniform conducting half‐space. Solutions are obtained for survey lines oriented at an arbitrary position and angle with respect to a cylindrical structure. The convergence properties of the general mutual impedance solution are analyzed using a low‐frequency approximation which is useful in predicting cultural anomalies in the frequency range of spectral IP surveys as long as all significant dimensions are less than one skin depth. Both interfacial polarization and induced currents in the cylindrical conductor are considered in examining the behavior of the overall spectrum as seen by an external observer. Spectral responses for dipole-dipole arrays oriented perpendicular and parallel to the buried conductor show that the phase shift is the most diagnostic parameter for pipe depth and survey data distortion. The results also show that field survey procedures can be devised to minimize such interference effects when the pipe position is known.

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