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FDTD method in the analysis faster EMP simulator field propagation and distribution

Author: SunFengJie
Tutor: ZhouQiMing
School: Chinese Academy of Engineering Physics
Course: Radio Physics
Keywords: FDTD method Numerical Simulation Electromagnetic pulse Fast forefront bounded wave simulator Transmission line
CLC: TM15
Type: Master's thesis
Year: 2008
Downloads: 171
Quote: 2
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Abstract


In this paper, the basic principles of the finite-difference time-domain (FDTD) method and the absorbing boundary conditions are discussed, using the FDTD method combined with the the loop integral method, the analog electromagnetic pulse (EMP) on fast forefront of the spread of bounded wave simulator to study the transmission line structure in the form of field propagation and field distribution to explore the relationship of the angle change and the rise time of the field of the transition section of the transmission line, the the electromagnetic leakage transmission line and test hall wall is given the influence of the the simulator workspace electric field waveform With changes in the distance, bounded wave simulator transmission line selection and design of the structure to provide a theoretical basis for the fast forefront. This article discusses the fast forefront bounded wave simulator has three different structural forms: subnanosecond forefront bounded wave simulator, large fast forefront bounded wave simulator gigahertz transverse electromagnetic (GTEM) transfer chamber. Suitable for sub-nanosecond pulse propagation in the form of the transmission line structure in the the subnanosecond simulator research, analysis, a theoretical analysis of the relationship between the rise time of the transmission line structure with field; respectively with three double exponential waveform as the excitation source, EMP in subnanosecond simulator in the dissemination and distribution of the FDTD method numerical simulation; dissemination and distribution of, and the simulator work space field experiments. Numerical simulation and measured results presence of dissemination and distribution agreement. Frontier rising subnanosecond simulator to approximately 0.8ns, and good job stability and maximum field strength of the electric field within the working area of ??1 × 1 × 1m ~ 3 reached 50kV / m, more evenly distributed in the left and right, and basically meet the electronic effect of instrument EMP and EMC test needs. The large fast forefront bounded wave simulator salient features rapid pulse leading edge (2.5 ~ 5ns), larger workspace (6m × 6m × 4m), suitable for larger equipment tests. The combined FDTD method MPML absorbing boundary conditions of the simulator, in addition to taking into account the numerical stability of the FDTD method and numerical dispersion problem, but also consider the requirements of computer storage space and computing time; transmission line structure design study before the length of the transition section and the cone angle of the pulse front. Numerical results show that, the field distribution in the working space is substantially uniform, and on the center line symmetrical distribution, slightly lower at both ends, with the theoretical analysis; under the same situation as the length of the first transition section, symmetrical structure. transmission line more than the transmission lines of the asymmetric structure conducive to faster transmission forefront of EMP; bounded wave simulator design of the transmission line structure of large fast forefront, still looking section proposed the idea of ??the application of dielectric lens. In order to understand the the GTEM cell spectral characteristics of the large-size, the selection of a good high-frequency characteristics of Gaussian pulse source, the incident bandwidth 1.5GHz and 5GHz Gaussian pulse as the excitation source of FDTD analysis, the end of the transmission of the different conditions characteristics and ± 1dB, ± 2dB field distribution.

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CLC: > Industrial Technology > Electrotechnical > Fundamental Theory of Electrical Engineering > The application of electromagnetic theory
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