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

A carbon fiber material and flying target technology, which is applied in the field of electromagnetic distribution prediction in carbon fiber material flying targets under lightning pulses, can solve the problems of not being able to meet the needs of high precision, time-consuming frequency domain sweeping, and accuracy limitations, and achieve unknown quantities Less, fewer computing resources, and simple equation establishment

Active Publication Date: 2015-06-24
NANJING UNIV OF SCI & TECH
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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 poi

Method used

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

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Embodiment Construction

[0017] The electromagnetic distribution estimation method in the carbon fiber material flying target under the lightning pulse of the present invention, the steps are as follows:

[0018] In the first step, assuming that the shell of the flying target is made of carbon fiber material, the flying target is irradiated with time-domain plane waves to simulate lightning pulses, and a polarized body current J is generated in the shell of the flying target v (r, t), since the total electric field in the shell of the flying target is equal to the sum of the incident electric field and the scattered electric field, the time-domain time-step electric field integral equation of the flying target shell is obtained as follows:

[0019]

[0020] in represents the incident electric field, represents the scattered electric field, Indicates the total electric field, and the specific expression is:

[0021]

[0022] where A v Denotes the vector magnetic potential and Φ v Represen...

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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...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 陈如山樊振宏丁大志
Owner NANJING UNIV OF SCI & TECH
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