星载平台可展开结构的设计与试验
发布时间:2018-05-05 07:30
本文选题:小卫星 + 平面可展开结构 ; 参考:《浙江大学》2015年硕士论文
【摘要】:小卫星由于其重量轻、成本低、研制周期短等优点受到越来越多的研究单位的重视,特别是在高校范围内掀起一阵小卫星研究的热潮。但目前的小卫星上很少搭载工作平台,使小卫星功能受限。为了拓宽小卫星的应用领域,迫切需要一种较大的、能够安装在小卫星上的平台结构,能够安装各种有效载荷。用可展开结构作为搭载平台,能使该平台在发射阶段占用空间少、使用时具有较大的空间,适合在小卫星上使用。 论文首先根据实际的使用功能需求,提出了一种适合于搭载在小卫星上的展开结构平台设计方案,并分别论述了该方案各分系统的方案设计,从而满足所有的使用需求。 采用拉索替代分析法对展开状态进行了模态分析,并与地面测试试验作对比,提出了提高刚度的建议供设计参考。 详细介绍了用ADAMS软件对该平面展开结构的展开过程进行了仿真,并和地面测试实验结果进行了对比;最后分析了展开结构与卫星连成整体后在太空中的展开过程,并给出该过程中的动力学参数变化趋势,有助于改善结构设计。 基于非接触摄影测量法,推导了以杆件与参考平面的倾斜角为表征量的平面度计算公式并利用无接触摄影测量系统进行了平面度测量;分析了三种不同的重力消除方法对平面度测量的影响,对比了各自的优缺点;最后提出了一些保证平面度的措施。这些对平面可展开结构的设计有很好的指导作用。 最后,对收拢状态的模型进行了整星基频扫描试验、低频正弦振动试验和随机振动,验证了结构的安全性。
[Abstract]:Because of its advantages of light weight, low cost and short research period, small satellites have been paid more and more attention by more and more research units, especially in colleges and universities. But at present the small satellite rarely carries the working platform, which limits the function of the small satellite. In order to broaden the application field of small satellites, it is urgent to have a large platform structure which can be installed on small satellites and to install various payloads. Using the deployable structure as the platform can make the platform occupy less space in the launch phase and have a large space when used, so it is suitable for use on small satellites. Firstly, according to the actual functional requirements, a design scheme of the unfolded structure platform is proposed, which is suitable for carrying on the small satellite, and the scheme design of each subsystem of the scheme is discussed respectively, so as to meet the needs of all the applications. The modal analysis of the unfolding state is carried out by using the cable substitution analysis method, and compared with the test results on the ground, some suggestions for improving the stiffness are put forward for the design reference. This paper introduces in detail the simulation of the development process of the plane unfolded structure by using ADAMS software, and compares with the experimental results of the ground test, and finally analyzes the unfolding process in space after the unfolded structure and the satellite are connected as a whole. The change trend of dynamic parameters in the process is given, which is helpful to improve the structural design. Based on the contactless photogrammetry, the calculation formula of flatness based on the tilt angle between the bar and the reference plane is derived, and the flatness measurement is carried out by using the contactless photogrammetry system. This paper analyzes the influence of three different gravity elimination methods on flatness measurement, compares their advantages and disadvantages, and finally puts forward some measures to ensure flatness. These can guide the design of planar deployable structures. Finally, the whole satellite fundamental frequency scanning test, low frequency sinusoidal vibration test and random vibration are carried out to verify the safety of the structure.
【学位授予单位】:浙江大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:V423;V416
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