预应力下空间站柔性太阳翼动力学特性分析

空间站柔性太阳翼上有以下预应力:1)在轨工作时,会周期性进出地球阴影区,结构温度会发生周期性的变化,温差在结构上产生了热应力;2)中央桁架斜拉杆上作用有展开预应力;3)柔性阵面上施加有张紧力。这些预应力都会引起几何刚度,从而改变太阳翼结构的动力学特性。文章使用Abaqus非线性动力学求解功能,首先对中央桁架部分和柔性阵面部分分别建立有限元模型,研究预应力对太阳翼动力学特性的影响,发现只有柔性阵面上的张紧力影响最为显著;然后针对完整的太阳翼结构,考虑阵面张紧力作用下,研究其动力学特性,并与未考虑预应力引起的刚度变化时的结构动力学特性进行对比分析。

Dynamic characteristics of a space station's flexible solar array with prestress

The flexible solar array (FSA) of a space station has the following kinds of prestresses: (1) the thermal stress caused by periodically varying temperature field in the central truss; (2) the deployment stress in the oblique rod of the central truss; (3) pretension in the flexible solar blanket. These kinds of prestresses will affect the geometric stiffness and change the dynamic characteristics of the FSA. The Abaqus nonlinear dynamic solver is used in this paper. First of all, the central truss and the flexible solar blankets are modeled separately to analyze the effect of the prestress. Results show that the pretension in the flexible solar blanket plays a major role in affecting the dynamic characteristics. Then, the whole model of the FSA is built to analyze its dynamic characteristics in consideration of the pretension. Finally, a comparison is made between the results with and without the prestress.