大型天线罩的模态分析与实验验证

doi:10.19936/j.cnki.2096-8000.20220128.008

复合材料科学与工程 ›› 2022, Vol. 0 ›› Issue (1): 54-61.DOI: 10.19936/j.cnki.2096-8000.20220128.008

大型天线罩的模态分析与实验验证

李建伟¹, 秦强强^2*, 韩冰², 周金柱²

1.中国电子科技集团公司第二十研究所,西安710068;
2.西安电子科技大学电子装备结构设计教育部重点实验室,西安710071

收稿日期:2021-09-22 出版日期:2022-01-28 发布日期:2022-02-10
通讯作者: 秦强强(1993-),男,硕士,主要从事电子装备精确建模与可靠性评估,xd_qinqiang@163.com。
作者简介:李建伟(1973-),男,学士,高级工程师,主要从事雷达复合材料天线的设计与制造。
基金资助:
国防科研项目(TDGC-CL-19-052-2);国家自然科学基金项目(51775405,52175247)

Modal analysis and experimental verification of a large radome

LI Jian-wei¹, QIN Qiang-qiang^2*, HAN Bing², ZHOU Jin-zhu²

1. The 20th Research Institute of CETC, Xi'an 710068, China;
2. Key Laboratory of Electronic Equipment Structure Design, Ministry of Education, Xidian University, Xi'an 710071, China

Received:2021-09-22 Online:2022-01-28 Published:2022-02-10

摘要/Abstract

摘要： 天线罩作为天线防护的复合结构,它不仅要满足结构强度和刚度的要求,还要满足电磁高透波性能的要求,蜂窝夹层复合结构的有限元仿真时,真实的蜂窝结构建模存在较大的难度。本文通过有限元仿真模态分析与实验模态分析的方法,对大型复合材料天线罩模态特性进行研究,通过模型修正方法缩小了实验与仿真固有频率之间的误差;通过实验模态测试获得了天线罩的前六阶固有频率和振型,确定了天线罩的固有振动特性;修正后天线罩模型的实验与仿真一阶固有频率的误差从16%下降到了2.3%,前五阶固有频率累计误差降低了31.8%,有效提升了有限元仿真的精度,验证了有限元模态分析的准确性;天线罩实验与仿真最大变形处的误差为9.6%,证明了模型修正方法的合理性和模型修正后材料参数的可信度。最后通过研制的模拟风载实验装置,采用沙子重力模拟风载验证了模型修正结果的可信度,同时证明了模型修正方法的合理性。

关键词: 天线罩, 模态测试, 有限元仿真, 模型修正, 代理模型

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

中图分类号:

TB332

李建伟, 秦强强, 韩冰, 周金柱. 大型天线罩的模态分析与实验验证[J]. 复合材料科学与工程, 2022, 0(1): 54-61.

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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大型天线罩的模态分析与实验验证

Modal analysis and experimental verification of a large radome

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