期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：233
期号：2
页码：022006
DOI：10.1088/1755-1315/233/2/022006
出版社：IOP Publishing
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.
