Supercomputing analysis of seismic efficiency of the electromagnetic pulse source “Yenisei”

2019 ◽  
Author(s):  
O. V. Sadovskaya ◽  
V. M. Sadovskii
Keyword(s):  
Electromagnetic Pulse ◽  
Pulse Source ◽  
Seismic Efficiency

Analysis of seismic efficiency of the electromagnetic pulse source "Yenisei"

2020 ◽  
Author(s):  
Oxana Sadovskaya ◽  
Vladimir Sadovskii ◽  
Evgenii Efimov
Keyword(s):  
Granular Materials ◽  
Electromagnetic Pulse ◽  
Seismic Sources ◽  
Time Interval ◽  
Pulse Source ◽  
Surface Soils ◽  
Low Frequencies ◽  
Periodic Action ◽  
Near Surface ◽  
Seismic Efficiency

<p>We developed a computational technology for numerical modeling of wave fields generated by seismic sources in blocky-layered geological media, and applied it to the analysis of efficiency of the electromagnetic pulse source of new generation "Yenisei", created recently by international geotechnical company "Geotech Seismic Services". To describe wave processes, we worked out new mathematical models of the dynamics of elastic, viscoelastic and elastic-plastic media, of porous and granular materials taking into account the increase in stiffness of such materials as pores collapse, [1]. Algorithms of numerical implementation of governing equations were realized for the cluster-type supercomputers, based on the method of two-cyclic splitting with respect to spatial variables. The conducted computational experiments have demonstrated that the proposed technology allows reproducing the system of waves near the region of excitation of seismic oscillations in 3D setting with a high degree of details and accuracy, [2]. We analysed frequencies and amplitudes of waves generated in the near-surface soils, and showed that our computational results are in a good agreement with seismic parameters of a real electromagnetic pulse source. We studied seismic efficiency of the pulse source as the ratio of the energy passing through the reflecting surface in the depth of layered massif to the energy of pulse effect on the surface. Besides, the energy of surface waves, which is obviously useless for the excitation of reflected waves, was estimated. To compare the energy efficiency of pulse sources with seismic sources of periodic action (vibrators), the problem of cyclic loading through the platform was solved numerically by the same method and the same geometric scheme. The seismic efficiency of vibrator was calculated by the maximum value of the energy fluxes during large time interval. Judging by computations, the pulse seismic sources are not inferior to the sources of vibratory type by seismic efficiency in the range of low frequencies. However, it is necessary to take into account that they differ sharply by the level of expended energy, because the energy of a pulse source, needed for generation of incident wave of a given amplitude, is many times lower than the energy of a vibrator.</p><p>The reported study was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project No. 18-41-242001: "Analysis of wavy seismic fields generated by the electromagnetic pulse source "Yenisei" in heterogeneous soil massifs during geological exploration in the conditions of northern regions of Eastern Siberia".</p><p>References</p><ol><li>Sadovskaya O., Sadovskii V. Mathematical Modeling in Mechanics of Granular Materials. Ser.: Advanced Structured Materials, vol. 21. Springer, Heidelberg – New York – Dordrecht – London, 2012. 390 p.</li> <li>Sadovskii V.M., Sadovskaya O.V., Efimov E.A. Analysis of seismic waves exited in near-surface soils by means of the electromagnetic pulse source "Yenisei". Materials Physics and Mechanics. 2019. V. 42, No. 5. P. 544–557.</li> </ol>

Simulation of Transient EMP Effects Coupling through Apertures Using Sub-Gridding FDTD Algorithm

2012 ◽  
Vol 195-196 ◽  
pp. 814-820 ◽  
Author(s):  
Jin Shi Xiao ◽  
Xiong Wei Ren
Keyword(s):  
Field Strength ◽  
Current Density ◽  
Electromagnetic Pulse ◽  
Pulse Source ◽  
Coupling Effects ◽  
Transient Electromagnetic ◽  
Double Exponential ◽  
Gauss Pulse ◽  
Em Field ◽  
Exponential Pulse

Transient electromagnetic pulse (EMP) can easily couple into the inner of targets via apertures. To calculate the EMP coupling effects on a cylinder object with openings, the coupling course is simulated using sub-gridding FDTD algorithm in this paper. Gauss pulse and double exponential pulse are selected as the incident pulse source. The coupling EM field strength E inside the object and the current density J on the surface are calculated. Several rules about EMP coupling effects are gotten both in time and frequency domain. The results can help us to understand the damage effects of transient EMP.

Investigation of a high power electromagnetic pulse source

2012 ◽  
Vol 83 (9) ◽  
pp. 094702 ◽  
Author(s):  
Yuwei Wang ◽  
Dongqun Chen ◽  
Jiande Zhang ◽  
Shengguang Cao ◽  
Da Li ◽  
...  
Keyword(s):  
High Power ◽  
Electromagnetic Pulse ◽  
Pulse Source
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