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Rapid analysis method for electromagnetic property characteristic model of repetitive structure considering carrier platform coupling

A carrier platform and structural feature technology, applied in the field of numerical calculation of target electromagnetic scattering characteristics, can solve the problems of accurate analysis, reduce storage and calculation complexity, and not make full use of structural repeatability, so as to achieve accurate analysis tools and reduce calculation complexity speed and reduce memory consumption

Active Publication Date: 2021-02-05
NANJING UNIV OF SCI & TECH
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Problems solved by technology

With the increase in the number of repetitive structural units and the large-scale structure of the platform itself, due to the limitation of memory and computing time, the traditional finite element, method of moments, and time-domain finite difference algorithms cannot be accurately analyzed on ordinary personal computers and servers. For this kind of problem, researchers have proposed fast analysis methods that can reduce memory and calculation time, mainly including multi-layer fast multipole algorithm based on integral equation method of moments, adaptive cross approximation algorithm, etc. These algorithms reduce storage and computational complexity
However, these methods do not make full use of the repeatability of the structure, and there is still room for improvement in the computational efficiency of electromagnetic problems with repetitive substructures

Method used

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  • Rapid analysis method for electromagnetic property characteristic model of repetitive structure considering carrier platform coupling
  • Rapid analysis method for electromagnetic property characteristic model of repetitive structure considering carrier platform coupling
  • Rapid analysis method for electromagnetic property characteristic model of repetitive structure considering carrier platform coupling

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Embodiment

[0088] combine Figure 5 According to the method of the present invention, the frequency selective surface (Frequency Selective Surface, FSS) model loaded on the scaled missile model is calculated and simulated. Such as Figure 5 (a), the missile has a total length of 0.68m and a diameter of 0.13m. FSS units such as Figure 5 As shown in (b), the side length is 12mm and the height is 1mm. A total of 81 FSS units are loaded on the warhead, the calculation frequency is 6GHz, plane wave incident, theta polarization incident angle is θ=90°, Among them, the missile unknown is 8871; the metal part of the FSS unit is discretized by the RWG basis function, and the unknown is 113; the medium part is discretized by the SWG basis function, and the unknown is 2512. Therefore, the total unknown of the FSS unit is 2625, and the total unknown of the whole model for 221496. Extracting 10 patterns for the FSS unit can satisfy the accuracy.

[0089] Three methods of MPI-MLFMA, MPI-CM-MLFMA...

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Abstract

The invention discloses a rapid analysis method for an electromagnetic property characteristic model of a repetitive structure considering carrier platform coupling. The method comprises the followingsteps: firstly, integrally modeling the repetitive structure conformal on the surface of a carrier platform; then, for the integrated structure, fully utilizing repetitive characteristics in the structure, introducing a characteristic mode global basis function method to reduce the impedance matrix dimension of the repetitive structure part, and greatly reducing the number of unknown quantities to be solved; then, fusing the multi-layer fast multipole with a feature mode, accelerating a reduced-order impedance matrix filling process and an iteration process, and improving the efficiency; andfinally, using a parallel order reduction technology based on MPI (Message Passing Interface) and OPENMP mixing to reduce the memory consumption and shorten the calculation time. An efficient and accurate analysis tool is provided for numerical optimization and design of a conformal repetitive structure and carrier platform integrated target.

Description

technical field [0001] The invention belongs to the technical field of numerical calculation of target electromagnetic scattering characteristics, in particular to a rapid analysis method of electromagnetic characteristics considering the electromagnetic coupling between a repetitive structure and a carrier platform. Background technique [0002] Repetitive structures are widely used in practical electromagnetic engineering, such as antenna arrays, metasurface artificial electromagnetic materials, and so on. These repetitive structures are often loaded conformally on aircraft, satellites and other carrier platforms, which will affect the electromagnetic performance of repetitive structures. Therefore, in order to realize the prediction, evaluation and optimization of electromagnetic performance, it is necessary to Integrated analysis with the carrier platform. With the increase in the number of repetitive structural units and the large-scale structure of the platform itself...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06T17/00G06F17/16
CPCG06F30/20G06T17/005G06F17/16Y02T90/00
Inventor 陈如山樊振宏丁大志朱晨曦
Owner NANJING UNIV OF SCI & TECH
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