Modal analysis and experimental verification of a large radome

doi:10.19936/j.cnki.2096-8000.20220128.008

Abstract

Abstract: As a composite structure to protect the antenna, the honeycomb sandwich radome should not only meet the requirements of structural strength and rigidity, but also meet the requirements of high electromagnetic wave transmission performance. In the finite element simulation of honeycomb sandwich composite structure, it is difficult to model the actual honeycomb structure. This paper used finite element simulation modal analysis and experimental modal analysis methods to study the modal characteristics of large composite radomes. The error between the experimental and simulated natural frequencies was reduced by the model correction method. The first six natural frequencies and mode shapes of the radome were obtained through experimental modal tests, and the natural vibration characteristics of the radome were determined. After the correction, the error of the first-order natural frequency of the experiment and simulation of the radome model decreased from 16% to 2.3%, and the cumulative error of the first five-order natural frequency was reduced by 31.8%, which effectively improved the accuracy of the finite element simulation and verified the finite element mode accuracy of analysis. The error of the maximum deformation of the radome experiment and simulation was 9.6%, which proved the rationality of the model correction method and the credibility of the material parameters after the model correction. Finally, through the developed simulation wind load experimental device, the sand gravity was used to simulate the wind load to verify the credibility of the model correction results.

Key words: radome, modal testing, finite element simulation, model modification, surrogate model

CLC Number:

TB332

LI Jian-wei, QIN Qiang-qiang, HAN Bing, ZHOU Jin-zhu. Modal analysis and experimental verification of a large radome[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(1): 54-61.

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