Experimental Research on Dynamic Characteristics of Truss Structure for Modular Space Deployable Truss Antenna
In order to accurately research the dynamic characteristics of truss structure for modular space deployable truss antenna, dynamic experiments are carried out. Based on the basic theory of dynamics and the characteristics of antenna structure, a set of dynamic experimental system is designed, and the modal experiments under free boundary conditions are carried out by means of single-point input and multi-point output. The experimental results show that the autocorrelation coefficients of all the modes of the antenna structure are 100%, and the correlation functions between the modes are small, the maximum value is only 15.45%, which shows that the experimental results are correct. The maximum relative error of natural frequency is only 10.59%. In addition, the experimental mode shapes with the frequency of 32.781 Hz and 58.003 Hz are all in good agreement with the first and the third mode shapes of finite element analysis. The experimental method proposed in this paper can provide reference for modal analysis of other large space deployable truss structures.
KeywordsDeployable antenna Modular structure Dynamics experiment
This project is supported by Key Program of National Natural Science Foundation of China (No. 51835002) and Liaoning Natural Fund Guidance Plan (2019).
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