Estimation method of electromagnetic distribution in carbon fiber material flying target under lightning pulse

Abstract

The invention discloses a method for estimating electromagnetic distribution in a carbon fiber material flying target under lightning pulse. In this method, the lightning pulse with extremely wide spectrum range is simulated by the plane wave in time domain, and the time domain analysis model of the carbon fiber material flying target under the lightning pulse is established. Use the time-domain plane wave algorithm PWTD to realize efficient calculation of the transient far field, apply the equivalent electric dipole model, quickly calculate the time-step time-domain volume integral equation MOT impedance matrix, solve the time-domain matrix equation and extract the electromagnetic characteristics in a wide frequency band . The invention only discretizes the flying target of carbon fiber material, uses the free space Green's function, the equation is simple, can analyze the non-uniform target, has high calculation accuracy and the unknown quantity is small; at the same time, because the time domain method is used to solve the problem, the invention can calculate once The electromagnetic characteristics of all frequency points in a frequency band, compared with the frequency domain method that requires frequency sweep operation, the time consumed for solving is greatly reduced.

Description

Prediction method of electromagnetic distribution in carbon fiber material flying target under lightning pulse technical field 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 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 differe...

AI Technical Summary

Problems solved by technology

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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