Method for estimating distribution of electromagnetism in flying targets made of carbon fiber materials under lightning pulses

Abstract

The invention discloses a method for estimating distribution of electromagnetism in flying targets made of carbon fiber materials under lightning pulses. The method comprises the following steps of simulating the lightning pulses with an ultra-wide spectrum range by using time domain plane waves; establishing a time domain analysis module of the flying objects made of the carbon fiber materials under the lightning pulses; performing transient far field high-efficiency calculation by using an algorithm of plane wave time domain (PWTD); quickly calculating an impedance matrix of a time stepping time domain volume integral equation MOT by using an equivalent electric dipole modal; solving a time domain matrix equation; and extracting electromagnetism characteristic in a broadband. By the method, only the flying targets made of the carbon fiber materials are dispersed, a free space green function is used, the equation is simple, uneven targets can be analyzed, the calculation precision is quite high, and an unknown quantity is small; and moreover, the equation is solved by a time domain method, and the electromagnetic characteristic of all frequency points in a frequency band can be calculated at one step. Compared with a frequency domain method requiring sweep frequency operation, the method has the advantages that time consumed on solving is greatly shortened.

Description

technical field [0001] The invention belongs to the simulation calculation technology for quickly calculating the electromagnetic scattering characteristics of a carbon fiber material flying target in a certain frequency band under lightning pulses, in particular the simulation calculation technology for the electromagnetic scattering characteristics of a target made of carbon fiber materials with high dielectric parameters and loss. Background technique [0002] Carbon fiber is made of organic matrix fiber (viscose, polyacrylonitrile or asphalt, etc.) by carbonization under high temperature inert gas at 1000-3000°C by pyrolysis method. It has high strength, high modulus, low density and linear expansion coefficient. It is a material with excellent mechanical properties. Carbon fiber is mainly a special fiber composed of carbon elements, and its carbon content varies with different types, generally more than 90%. It is made of organic matrix fibers (viscose, pitch, polyacry...

AI Technical Summary

Problems solved by technology

[0005] The accuracy of traditional time-domain methods such as FDTD is greatly limited and cannot meet the increasing demand for high precision

In the frequency domain method, the impedance matrix of each frequency point is different, and the calculation of the electromagnetic characteristics of a frequency band must be swept, and the frequency sweep in the frequency domain is very time-consuming and deviates from the actual needs.

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