Open AccessResearch and application of the FETD method for the EM transient response of MTLs excited by HEMP
Author(s) -
Gong Yanfei,
Hao Jianhong,
Jiang Luhang,
Liu Qiang,
Zhou Haijing
Publication year - 2019
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2018.5188
Subject(s) - transient (computer programming) , electromagnetic pulse , finite difference time domain method , maxwell's equations , electromagnetic field , electrical impedance , transient response , time domain , mathematical analysis , physics , mathematics , optics , engineering , computer science , electrical engineering , quantum mechanics , operating system , computer vision
An efficient field‐to‐line coupling model in the time domain is developed combining the second‐order decoupled multiconductor transmission lines (MTLs) equations and the finite‐element time‐domain (FETD) method for evaluating the electromagnetic (EM) transient response of MTLs over a lossy ground excited by a high‐altitude EM pulse (HEMP). First, the incident HEMP electric fields on the lines are calculated as equivalent distributed sources introduced into the MTLs equations. Then, the discrete FETD equations for the lines against the HEMP, in which the effect of frequency‐dependent parameters caused by the ground impedance is considered, are derived using the FETD method with current as the single iteration variable. Finally, the transient currents induced on the lines are obtained by assembling all the discrete FETD equations into the global FETD equation, and the transient induced voltages on the lines are calculated by discretising the coupled equations with respect to current and voltage. The proposed model is successfully compared with the finite‐difference time‐domain method via several examples. It is then employed to analyse the effect of various parameters on the transient currents including the polarisation and the incident angles of the HEMP, the conductivity, and the relative permittivity of the soil.