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PSO Algorithm for Optimum Design of Absorbing Material and Study of Parameters Reconstruction

Author: WuShengHui
Tutor: GeDeBiao
School: Xi'an University of Electronic Science and Technology
Course: Radio Physics
Keywords: Particle Swarm Optimization Absorbing materials Optimal design Electromagnetic parameter extraction
CLC: TU528
Type: Master's thesis
Year: 2007
Downloads: 87
Quote: 0
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Abstract


Particle Swarm Optimization (PSO) is a group search-based adaptive evolutionary computing technology. Can effectively solve complex optimization tasks, the rapid development in the past few years, and has been widely used in image processing, multi-objective optimization, and electromagnetic fields. This article studies the particle swarm optimization, control parameters on the performance of the algorithm search algorithm, particle swarm optimization algorithm and the propagation matrix method combines applied to the inversion of the electromagnetic parameters of the dielectric plate. For the PSO algorithm to optimize complex multimodal function will converge to local optima, calculated results of large errors and other shortcomings, improving the standard algorithm, numerical simulation results and examples to fully explain the improved algorithm has greatly improved. Order to achieve the effect of microwave absorbing and shielding electromagnetic absorbing concrete material usually both consumption for electric and magnetic media. For both media consumption of electricity and magnetism, derived corresponding to the penetration depth, propagation wavelength, the reflection and transmission coefficients Fresnel formula, and analysis of the concept of impedance matching. Focus on two key factors: design absorbing material attenuation characteristics and matching characteristics. Particle Swarm Optimization as the optimization method, two layers of radar absorbing concrete material medium parameters and thickness with radar absorbing concrete absorbing and shielding effect were calculated. Meanwhile, the preparation of the corresponding computer optimization-aided design software, interface, software, not only two layers of absorbing material absorbing materials design of microwave absorbing and shielding requirements, also has a simple operation, easy user operation using the advantages. Absorbing materials are usually doped medium, the configuration of the absorbing material must apply for measurement and extraction of doping the medium equivalent electromagnetic parameters in order to achieve optimal design results. The electromagnetic parameter extraction Nicolson-Ross-Weir (NRW) as part of the microwave measurement, from the 1970s has been more than thirty years. This article detailed derivation of the formula of the rectangular waveguide and free space in NRW method to extract medium parameters, summed up the extraction method, discussed the different extraction methods in both cases. Rectangular waveguide and free space scattering parameters using a numerical simulation method to extract medium parameters, the resonance appears in the the NRW method of extraction medium parameters were calculated by FDTD propagation matrix method. Finally, by PSO and NRW two methods to extract the equivalent parameters doped concrete medium, and calculation results are compared with the empirical formula, with consistent results.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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