Study of mode localization in an umbrella antenna with tensile ropes

2018 International Conference on Construction, Aviation and Environmental Engineering

生态环境科学;生物科学

Wang, Pengpeng^1 ; Wang, Bo^1 ; Zheng, Shikun^1 ; Shi, Tian^1

Xi'An Institute of Space Ratio Technology, Xi'an, Shaanxi

710100, China^1

关键词: Antenna structures;    Dynamic equations;    Manufacturing process;    Mode localization;    Stiffness tests;    Strong coupling;    Weak couplings;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/233/2/022006/pdf
DOI  :  10.1088/1755-1315/233/2/022006

来源: IOP

【 摘 要 】

The umbrella antenna is a typical periodic structure in nature, and as its ribs are made of CFRP (carbon fibre reinforced plastic), the presence of irregularities in dimension, stiffness and mass is unavoidable during manufacturing process, which will result in mode localization of the antenna. Excessive mode localization will damage the reflector precision and endanger safety of the antenna, so how to suppress mode localization of the ribs is important for umbrella design. Combined with the development of an umbrella antenna, mode localization of the structure is studied. Firstly, dynamic equations of an umbrella antenna with tensile ropes are derived. Then, based on the ribs stiffness test results, further mode localization simulation and test are conducted. The final simulation and test results show that, when stiffness of the tensile ropes reaches to 3N/mm, the antenna structure will change from a weak coupling system to a strong coupling system and mode localization of the ribs are effectively suppressed.