Bing Wei

Xidian University

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SO-DGTD method for dispersive media

Qian Yang Bing Wei Linqian Li Renxian Li Debiao Ge

A new method called the SO-DGTD method is proposed for solving the time-dependent Maxwell's equations via the Discontinuous Galerkin Time Domain (DGTD) method with dispersive media, the Shift Operator (SO) method is used to represent the constitutive relations. This method has a universal equation for dispersive media models, i.e. the Debye model, the Drude model, the Lorentz model, the SO-DGTD method can be applied to the hybrid dispersive media model. The accuracy of the proposed method is verified by numerical examples.

Debye

Operator (biology)

Hyperboloid model

10.1109/apusncursinrsm.2017.8073254

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Citations (0)

Shift-operator finite-element time-domain dealing with dispersive media

Optik (2019)

Linqian Li Bing Wei Qian Yang Debiao Ge

Operator (biology)

10.1016/j.ijleo.2019.01.064

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Citations (3)

A Spatial Modes Filtering FETD Method Combined With Domain Decomposition for Simulating Fine Electromagnetic Structures

IEEE Microwave and Wireless Components Letters (2022)

Kaihang Fan Bing Wei Juan Chen Xinbo He

In this letter, a spatial modes filtering finite-element time-domain (SMF-FETD) method combined with dual-field domain decomposition (DFDD) is proposed for analyzing 2-D electromagnetic structures with fine features. The SMF-FETD method can obtain unconditional stability by removing unstable modes. Thus, a large time step is available in the SMF-FETD method though the fine features exist. However, the global eigenvalue solution is required in the SMF-FETD method, which brings a great burden on the computing memory and time. To solve this problem, the DFDD technique is introduced into the SMF-FETD method. The technique solves the SMF-FETD equations in each subdomain and relates the adjacent subdomains explicitly using the equivalent electromagnetic currents on the subdomain interfaces. It can greatly reduce the computing memory and time. Numerical examples are presented to verify the accuracy and effectiveness of the proposed DFDD-SMF-FETD method.

10.1109/lmwc.2022.3178772

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Citations (3)

Analysis of the transmission characteristics of radio waves in inhomogeneous weakly ionized dusty plasma sheath based on high order SO-DGTD

Results in Physics (2017)

Bing Wei Linqian Li Qian Yang Debiao Ge

Based on high order hierarchical basis function and the ideal of shift operator, shift operator discontinuous Galerkin time domain (SO-DGTD) technique for dealing with weakly ionized dusty plasma electromagnetic problems is proposed. Lagrange interpolation is used to transform the metallic blunt cone aircraft with weakly ionized dusty plasma sheath from geometric model built by COMSOL to electromagnetic computational model. In the case of two-dimensional transverse magnetic (TM) wave, the electromagnetic wave propagation in weakly ionized dusty plasma sheath is calculated by SO-DGTD technique. And then, the influence of dust particle concentration and dust radius on the radio wave transmission is analyzed, and the radio wave propagation characteristics pass through the sheath is compared with the flight speed and height change.

Debye sheath

10.1016/j.rinp.2017.07.029

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Citations (2)

Rapid Recovery Technology of SF₆/N₂ Mixed Insulation Gas in Electrical Equipment

Journal of Physics Conference Series (2024)

Lijun Fu Yanling Guan Liang Zhang Bing Wei Guoxin Li

Abstract SF 6 mixed gas is widely used as an insulation and arc extinguishing medium in electrical equipment in cold regions of northern China. Due to its low liquefaction temperature, existing gas recovery technologies are unable to achieve efficient and rapid recovery of SF 6 /N 2 mixed insulation gases. In response to this challenge, a two-stage membrane separation and recovery technology has been proposed, which can efficiently and quickly separate SF 6 and N 2 from the mixed gas. The volume fraction (V/V) of obtained product SF 6 gas reaches 90%, and the use of compression and refrigeration units can achieve rapid filling of 50 m 3 /h mixed gas. At the same time, the enrichment and recovery of trace SF 6 gas in the exhaust gas are achieved. After enrichment, the volume fraction (V/V) of SF 6 gas reaches 92%, and the volume fraction (V/V) of SF 6 gas in the emptied mixed gas is 600 μL/L, far below the national standard value, solving the problems in actual production.

10.1088/1742-6596/2704/1/012012

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Scattering by a two-dimensional cavity filled with an anisotropic medium

Waves in Random Media (2003)

Bing Wei Debiao Ge

Abstract Using the Green function of an anisotropic medium in free space and the Green identity, the boundary integral equations for a two-dimensional homogeneous anisotropic medium are deduced. These equations are then applied to analyse the scattering problem of an open cavity filled with an anisotropic medium located in a conducting plane. To the best of our knowledge, this problem has not been dealt with in previous publications. We implement the boundary element method and generalized network formulation to solve the boundary integral equations and present some examples. The computed results are in good agreement with the one obtained by the modal matching method. This illustrates the feasibility of this scheme. Two examples of the radar cross section for an open cavity filled with an anisotropic medium are also presented.

10.1088/0959-7174/13/4/302

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Citations (4)

Improved FDTD Method for Coupling Analysis of a Dielectric-Coated Wire Above Rough Soil Surface Under HPEM Pulse

IEEE Transactions on Electromagnetic Compatibility (2021)

Tian Wei Bing Wei Xinbo He

An improved finite difference time domain (FDTD) method is proposed to calculate the transient coupling of a dielectric-coated wire above the rough soil surface under the high power electromagnetic (HPEM) pulse. The improved method is based on the domain decomposition technique, in which the dielectric-coated wire and the rough surface are allocated into the target subdomain and the rough surface subdomain, respectively. The reflected waveform from the rough surface is computed by applying the FDTD method combined with the time-domain Huygen's technique. The incident field on the target subdomain is calculated through the superposition of the excitation fields generated with the directly incident wave and the reflected wave from the rough surface. The near-field distribution and the energy-flux density (EFD) inside the dielectric-coated wire are simulated by running the FDTD in the target subdomain. The accuracy and high efficiency of the improved method are validated and demonstrated by comparing with the conventional FDTD method. Finally, the influences of some parameters related to the rough soil surface and dielectric-coated wire on the EFD are analyzed through the typical examples.

Electromagnetic pulse

10.1109/temc.2021.3094905

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Citations (3)

Rod-pinch diode experiments at a 1.2 MV pulsed power generator

Jianqiang Yuan Weiping Xie Hongtao Li Shuping Feng Bing Wei

Rod-pinch diodes are considered a promising device for flash radiography applications ^1-3 . High brightness X-ray with spot size less than 1 mm can be generated from the rod-pinch diodes if operated at currents more than the critical current.

Pulsed Power

Z-pinch

10.1109/plasma.2015.7179871

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Time-Domain Analytical Expression for Far Radiation Field of Arbitrarily Oriented Dipole above Layered Half Space

2021 13th International Symposium on Antennas, Propagation and EM Theory (ISAPE) (2018)

Ning Shen Bing Wei Shitian Zhang Weike Yi

Using the frequency-domain far field analytical expression of the arbitrary orientation dipole above the layered half space, combined with the frequency-domain to time-domain conversion relationship and the Fourier transform, the time-domain far field analytical expression is derived. The far field analytical expression contains the convolution of the incident source and the time-domain reflection coefficient. The method has clear physical concept and simple calculation, and has the advantage of obtain wide frequency band information with Fourier transform. The numerical results prove the validity and correctness of the proposed method.

Convolution (computer science)

Expression (computer science)

Reflection

Reflection coefficient

10.1109/isape.2018.8634340

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A novel deep learning model based on the ICA and Riemannian manifold for EEG-based emotion recognition

Journal of Neuroscience Methods (2022)

Minchao Wu Shiang Hu Bing Wei Zhao Lv

Robustness

Riemannian manifold

10.1016/j.jneumeth.2022.109642

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Citations (18)