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This paper presents a novel method of inductance calculation for the incomplete loop problem. This method is based on the relationship between inductance and induced voltage from the circuit theory. The method embarks from Faraday’s Law, and calculates induced voltage of every flux element. Total induced voltage is given by summation of elements and then the inductance value is obtained. Numerical...
A lightning radiation electromagnetic field data acquisition and processing system based on LabVIEW is proposed in this paper. This system can acquire two channels of magnetic field signal and one channel of electric field signal simultaneously. The sampling rate of the system can reach up to 20 MS/s, and this value can be adjusted according to the requirement of the different measurement tasks. The...
In order to investigate effects of ground resistivity on the lightning radiation electromagnetic fields produced by lightning return-stroke, a three-dimensional finite-difference time-domain (FDTD) numerical model is developed with lightning current's transmission line model. Lightning radiation electromagnetic fields at the flat ground are calculated and effects of different soil resistivities on...
A numerical method is presented for calculating shielding effectiveness of the wire-mesh reinforcement. The model is based on the field approximation for thin wire in the finite-difference time-domain (FDTD) method. Then, the method is used to compute the shielding effectiveness of the cage built with wire-mesh reinforcement. The FDTD results are in very good agreement with the results from the method...
With the incidence of lightning radiation field, the shielding effectiveness of reinforced concrete is evaluated. A rigorous method to calculate the electromagnetic fields in building is proposed based on the equivalence theorem and MoM. For more efficient calculation of GSI, a self-adaptation sampling approach to find appropriate sampling path and determine the number of sampling point is also presented...
A method of moment (MOM) solution for analyzing the electromagnetic shielding performance of rectangular metal enclosure with aperture covered with wire grid is presented. The concerned objects are modeled by using rectangular surface patches and the piece wise linear basic functions are used to expand the unknown electric currents on the surfaces of the cavity. The wire grid that covers the apertures...
Experts from Wuhan high voltage research institute have developed a lightning location system. Experimental studies on the frequency response characteristics of the magnetic field measuring loop were carried out at a thunder detection station, and results are presented in this paper. In addition, theoretical analysis and numerical analysis are presented, and suggestions of improvement for the magnetic...
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