对角伸展太阳帆结构及膜面应力导入分析

为研究膜面应力导入方式及应力大小对太阳帆结构的影响，进行了有限元模拟分析.首先，阐述了此类太阳帆导入膜面应力的必要性及其合理范围，并介绍了膜面应力导入的3种方式；其次，利用有限元软件ABAQUS，以欧洲航天局和德国宇航中心研制的20 m×20 m太阳帆为目标建立模型，然后采用静力法并考虑非线性的影响，分别对3种方式导入膜面应力的太阳帆进行结构分析，模拟太阳帆完全展开时在光压作用下膜面的变形和支撑结构的静力响应，获得膜面应力与豆荚杆轴压之间的关系，确定了膜面应力的合理范围；最后，对比分析了不同导入方式对膜面应力分布以及不同膜面应力对帆面形态和结构刚度的影响.结果表明：不同的应力导入方式，太阳帆膜面角落处均会出现应力集中，但膜面褶皱分布不同；膜面导入应力越大，基频越大，同时利于结构整体运动的控制.
To study the effects of different ways of importing the membrane stress and different stress values on diagonal extendable solar sail craft, the finite element simulation analysis is carried out. In detail, the necessity of importing the membrane stress and its reasonable value range are overviewed and three ways of importing the membrane stress are introduced. Based on the finite element software ABAQUS, the model of the 20 m×20 m solar sail craft made by European Space Agency (ESA) and German Aerospace Center (DLR) is established. The structure analysis of the model is performed with static nonlinear method considering the three ways of importing the membrane stress. Furthermore, comparative analysis is made on the membrane stress distribution and the effects of membrane stress on the structural rigidity as well as sail state of solar sail are evaluated. In general, the observations in this paper are significant for further research on space solar sail prototype. The results show that stress concentration occurs on the solar sail corner of membrane surface under different ways of importing the membrane stress, while the fold distribution of the membrane surface is different, frequency increases with the increasing of the importing membrane stress, which is beneficial to overall movement of the solar sail craft.