In the early stage of the five-star red flag display system, the research team designed a variety of display forms, including memory alloy display scheme, servo flag-raising scheme, mechanism display scheme, folding fan display scheme and so on. Although there are different forms, the researchers found that only the five-star red flag unfolded in the form of a scroll is relatively flat and will not wrinkle after high and low temperature tests.
The research team has done a lot of theoretical research and simulation experiments on how to ensure that the five-star red flag has enough strength and remains flat when deployed. Chang Cheng said that the research team spent 1 years on material selection, and finally selected twenty or thirty kinds of fiber materials. Through physical tests such as thermal compatibility, high and low temperature resistance, antistatic property and moon dust prevention, it is finally decided to adopt a new composite material, which can meet the requirements of strength and dyeing performance, thus ensuring that the five-star red flag can resist the harsh environment of the moon surface, and will not fade, cross-color or deform.
Although this is only a thin five-star red flag, it is high in technology. ? Ma Wei, project director of the five-star red flag display system, said with emotion.
The plane motion envelope of the five-star red flag of Chang 'e V is nearly 2000mm? 900mm, the weight of the whole system is only 1 kg. Ma Wei said that choosing such a flag size is the result of comprehensive consideration by the development team. The purpose is to highlight the field of view as much as possible, so that the photos taken by the camera can not only see the surface of the moon and deep space, but also see the lander. The five-star red flag is too big or too small, and the photos can't show rich elements.
Because the weight of the five-star red flag display system is only 1 kg, the development team has made a lot of efforts to reduce the weight of the whole system, not only the materials should be lightweight, but also the equipment should be carried out? Slimming? . At the beginning of the project, the development team demonstrated the use of four-pole, three-pole and two-pole successively, but considering the complexity and weight, the second-pole was finally chosen to present it.
The rod structure scheme is adopted because it is a relatively mature technology in the aerospace system. The solar (00059 1, bar) panels of spacecraft, including satellites and spaceships, all adopt rod structure to ensure reliability. ? Li Yunfeng said.
In order to control the weight of the whole five-star red flag display system, the development team also optimized the structure, and made the support arm as light and small as possible on the basis of selecting high-temperature and cold-resistant materials. The supporting structure used in the system can withstand the test of harsh environment such as alternating cold and hot, space irradiation and extremely low vacuum.