卫星承力筒结构的模态试验方法探讨

文章详细阐述了某型号卫星承力筒结构的模态试验设计及试验实施过程中所取得的实践经验。采用单点随机激励法、两点随机激励法、单点步进正弦扫描激励法均能得出较准确的航天器结构主频。较好的办法是:为获取大型航天器结构的一阶主频，可先采用单点随机激励法得出结构主频，然后采用单点步进正弦扫描激励法进行数据结果的验证；为获取大型航天器结构的高阶模态参数或结构阻尼系数，应采用两点或两点以上的模态试验激励方法，使激励输入能量平均且更接近于航天器结构实际受力工况。文章中对承力筒结构模态试验设计及方法的探讨对大型航天器的结构模态试验具有借鉴作用。

Modal test techniques for satellite canister structure

The paper presents the test design and the implementation of the canister modal test of a satellite. The accurate major frequencies of the spacecraft structures can be obtained with the single-point random excitation method, two-point random excitation method and single-point stepped sine excitation method. The first frequency of the large spacecraft structure can be acquired with the single-point random excitation method and be verified with the single-point stepped sine excitation method. The two or more points excitation methods are used to obtain the parameters of higher mode or the structure damping rates, which would make the input energy close to the average value and the response close to the real dynamic state of the spacecraft structures. The study can be a references to the modal test of large spacecraft structures.