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Prediction and experimental studies of iron fiber absorbing materials equivalent electromagnetic parameters

Author: LiuYunJie
Tutor: ZhaoBoLin
School: University of Electronic Science and Technology
Course: Materials Physics and Chemistry
Keywords: Iron fiber Radar absorbing materials Strong perturbation theory Equivalent electromagnetic parameters Genetic Algorithms
CLC: TB34
Type: Master's thesis
Year: 2005
Downloads: 425
Quote: 5
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Abstract


Iron fiber is a new type of radar absorbing materials based on the shape anisotropy , it has the characteristics of lightweight, high mu , wide frequency than conventional absorbing material has excellent absorbing properties . The foreign research began in the mid-1980s has achieved a breakthrough , developed the excellent performance of the polycrystalline iron fiber corrosion-resistant paint , and began to practice . Domestic iron fiber more and more attention , but how to control the polycrystalline iron fiber coating equivalent electromagnetic parameters and optimize the design needs further exploration and research . In this paper, a strong perturbation theory as an analytical tool equivalent electromagnetic parameters , details the strong perturbation theory equation and use its mathematical model . Equivalent electromagnetic parameters of the equation is a coupled nonlinear equations, only an iterative method to solve . Each equation in the four - phase coupling parameters, each parameter corresponding to the two unknown quantities . Difficult to solve with traditional iterative methods , we propose using genetic algorithms to optimize the search for the global solution . According to the derivation of the formula , vc development environment , the preparation of the program . Calculated the relationship between the electromagnetic parameters of fiber mixed media equivalent length , radius , density and electromagnetic field frequency , and draws a series of useful law . On the basis of theoretical analysis and experimental study to compare the experimental data and theoretical data . Better fit of the experimental results and theoretical data , indicating the rationality of the mathematical model in practical applications . However , due to our limitations , absorbent stainless steel fibers , magnetic relatively weak , so we only consider the characteristics of the dielectric constant . Iron fiber absorber itself is a conductive material. Fiber length in the paint , the increasing concentration of the corresponding dielectric loss , so impossible to design a better absorbing material , so reducing the dielectric loss of the iron fiber absorbing materials iron fiber absorbing materials and practical key technology , this article uses the wrapped fiber as the absorbent , through experimental studies to achieve the desired effect . Calculations and some rules obtained in this paper the design of the coating has great reference value .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Functional Materials
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