中国空间科学技术

中国空间科学技术 ›› 2024, Vol. 44 ›› Issue (2): 68-73.doi: 10.16708/j.cnki.1000-758X.2024.0023

• 可展开空间结构专栏 • 上一篇    下一篇

空间可展开天线模态测试与模型修正技术

任志威，杜敬利，王飞杰   

  1. 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
  • 出版日期:2024-04-25 发布日期:2024-04-09

Modal testing and model updating of space deployable antenna

REN Zhiwei，DU Jingli，WANG Feijie   

  1. The Key Laboratory of Electronic Equipment Structural Design，Xidian University，Xi’an 710071，China
  • Published:2024-04-25 Online:2024-04-09

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摘要： 为准确预测结构的力学特性，使仿真结果精确逼近试验结果，必须对有限元模型进行修正。由于网状可展开天线的有限元模型中存在着各类结构参数且内部索网属于柔性结构，索网索段由于预张力才具有刚度，结构的这一特殊性导致模型修正困难。对3m可展开天线样机进行了模态测试，在样机自由状态下获取了结构的模态频率和振型；针对可展开天线这种柔性复杂结构模态参数难识别、待修正参数多的特点，对修正参数进行了有针对性的选择；使用基于设计参数灵敏度型的模型修正方法对有限元模型进行了修正，缩小了样机与仿真固有频率和振型之间的误差，得到一种处理含有索网结构的模态测试流程和模型修正方法。

关键词: 模态测试, 网状结构, 可展开天线, 灵敏度分析, 模型修正

Abstract: In order to accurately predict the mechanical properties of the structure and accurately approximate the test results of the simulation，the finite element model must be corrected.In this paper，the modal test of the 3m deployable antenna prototype was carried out，and the natural frequencies and vibration model shapes of the structure were obtained under the free state of the prototype.In view of the characteristics of the flexible and complex structure modal parameters of the deployable antenna，which are difficult to identify and there are many parameters to be corrected，the modified parameters were selected in a targeted manner.The finite element model was corrected by using the model correction method based on the sensitivity type of design parameters，the error between the prototype and the simulated natural frequency and mode shape was reduced，a modal test process and a model correction method containing the cable-net structure were obtained.

Key words: modal test, cable-membrane structure, deployable antenna, sensitivity analysis, model updating