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Study on Mechanical System Design of Weighty Payload and High Accuracy Antenna for Radar Satellite

Author: ChenXiaoFeng
Tutor: GuLiQiang；MiaoJun
School: Shanghai Jiaotong University
Course: Mechanical Engineering
Keywords: Antenna Deployment mechanism Structural dynamics analysis Thermal deformation analysis
CLC: V443.4
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract

Advantages of synthetic aperture radar satellite without limit of sunshine and weather conditions, all-weather, all-time ground-to-ground observation, and the ability to penetrate and some surface features, the application needs of the increasingly widespread. The important carrier the antenna mechanical system is connected to the satellite stars payload, the main function is the load of each stage of the installed antenna integrated platform to withstand transport, test, launch, on-orbit antenna board to expand, and to ensure that the surface of the antenna array orbit accuracy requirements, the antenna mechanical systems realization of the payload performance has a pivotal role. With the continuous improvement of user needs, the antenna has a heavy, large diameter antenna configuration is complex, and high accuracy requirements, therefore, to ensure performance, low response and high stiffness of this type of antenna in rail low deformation load The study, an important issue is an urgent need to address the spatial structure of institutions. Based on a satellite radar antenna load is heavy, the demand of high accuracy requirements, describes the design of the key components of the antenna mechanical systems, institutional and structural dynamics simulation analysis, and antenna front rail thermal deformation analysis, and the results of the analysis carried out optimize the design and to carry out the modal testing to verify the dynamic simulation analysis results. Simultaneous vibration test, launched a pilot validation of product performance and optimization results. Through structural dynamics calculations to identify the factors that affect the antenna rigidity and response, the configuration of the load-bearing structure of the antenna main, connecting the number and arrangement of the pressing point of the antenna and the astral, the size of the distance between the antenna and the planets and other aspects The design parameters were optimized to solve the technical difficulties of the overloaded antenna high stiffness and low response to improve stiffness and reduce response purposes. Meanwhile, according to the antenna in orbit environmental conditions, the establishment of the thermal deformation of an antenna array surface calculation model, by contrast from the materials, dimensions, configuration, and temperature conditions, the connection way analysis to identify the influence of deformation of the antenna heat sensitive source, antenna array surface and based on the results of the analysis, the corresponding measures to adjust the product design parameters, which can reduce the thermal deformation to improve in orbit accuracy purposes. By computational analysis and experimental testing, given the more reasonable and feasible engineering design, this design enables Shoulong configuration to meet the frequency requirements, expand the configuration to meet the low frequency and in-orbit deformation requirements breakthrough in high precision heavy loads The antenna mechanical key technologies laid the foundation for the application of engineering related products.

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