| In recent years, exacerbated by the El Nino, extreme weather disasters such as flood, blizzard and drought, occur frequently in various regions of China. In order to strengthen the monitoring and forecast of weather, FY-3 and FY-4 weather satellite series has been successively launched in China, which provides very important date for our weather forecasts, weather research and environmental remote sensing, and make a significant contribution to international cooperation in meteorology. In this paper, atmospheric sounder as the national "863" plan key support project in the field of earth observation and navigation technology, is to meet the application needs of the geostationary orbit atmospheric sounding, and the final goal is as the main load carried on microwave FY-4 stars. Microwave radiometer is widely used in remote sensing of Earth, deep space exploration, guidance, security, medical and other fields. The traditional real aperture microwave radiometer is difficult to reach the requirements of higher and higher spatial resolution because of restrictions on the aperture size. The interferometric synthetic aperture microwave radiometer equivalents large aperture antenna by smaller aperture antenna array and obtains the ideal resolution, therefore has the very good development prospect. In order to provide support and precision adjustment for the ring on which 70 antennas installed, and reduce the weight, a adjustable hinge carbon fiber lever truss structure is designed in this paper. In this paper, the mechanical parts of the key technologies of the atmospheric sounder device, based on synthetic aperture microwave radiometer technology, are researched and analyzed, what result provides a reference for the design and manufacture of spaceborne atmospheric sounder. In this paper, the main research includes the following aspects:(1) On the basis of consulting a large number of related literature at home and abroad, the development history of atmospheric detection technology, the principle of synthetic aperture microwave radiometer and composite materials truss structure are summarized and main research objective and research significance of this article are illuminated;(2) Technical requirements, design features and design principles of the atmosphere detectors are described. A set of adjustable hinge carbon fiber truss support structure is designed, in which carbon fiber material is used in the overall device except the hinge joint in addition to reduce the weight, and the overall design is finished combined with CATIA; Basis on this,the mathematical model of the truss structure is analyzed;(3) Through the analysis of working conditions atmospheric sounding instrument, using the finite element analysis software ANSYS anisotropic carbon fiber composite material pre-treatment and then the overall device static and modal analysis on the mechanical properties of the device structure of the study. The results showed that the designed device still needs further optimization, reducing distortion and increasing the fundamental frequency to meet the design requirements;(4) Based on the previous analysis of this paper, the device was further improved and optimized. The size of key parts such as the ring have been optimized by ANSYS Workbench. The results of accuracy and error analysis basing on the results of static analysis show that the structure meets the requirements of statics; After applying the locking point,its natural frequency meets the design requirements;(5) The assembling and adjustment processes of the sounder truss support structure are introduced and analyzed. The bolt group between the atmospheric probe and flip car is analyzed, and the rationality of the structure design is verified. |
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