Open AccessModal Investigation in Space Truss Deployable Antenna
Author(s) -
Yonggang Fang,
Shinkun Zheng,
Longlei Dong,
Yonggang Xue,
Jiaming Zhou
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2230/1/012012
Subject(s) - modal , modal analysis , truss , modal testing , acoustics , antenna (radio) , hammer , structural engineering , modal analysis using fem , space (punctuation) , computer science , engineering , aerospace engineering , physics , vibration , materials science , electrical engineering , polymer chemistry , operating system
Due to the large size, low frequency, and poor transmission of the space truss deployable antenna (STDA), it is not easy to perform experimental modal analysis (EMA) using hammers or exciters. In this paper, the operational methods ensure that both the low-frequency and high-frequency modes of the STDA are excited. A parameter estimation method called PolyMAX is employed to identify modal shapes, modal frequencies and modal damping of the STDA only using dynamic responses. Further, a gravity unloading system is used to simulate the microgravity environment of the STDA in space, and the dynamic responses in this state are collected and processed. Finally, we discuss the difference of STDA modal parameters under the gravity and microgravity conditions through the previous test results. The technology used in this study can be further applied to the similar STDA structures.