SMA在星载天线上的热变形控制研究

Thermal deformation control of shape memory alloy in space-borne antenna

为了保证星载大型可展开桁架天线在轨运行时能可靠的工作,就必须对其进行在轨热变形控制。通过使用ANSYS软件对可展开天线加入NiTi形状记忆合金丝且在轨道的不同位置点的情况进行了计算,得出了天线反射面的均方根误差。通过研究可以发现,在周边桁架天线中嵌入SMA后减小了天线反射面的均方根误差,从而达到了保证天线型面精度的目的。

In order to maintain the high reliability of the large deployable antenna in satellites in space thermal environment, it is very important to control the thermal deformation of antenna at orbit. The main research object is to use characteristic of shape memory alloys （SMA） to control the thermal deformation of the deployable antenna at orbit. The stress of the antenna and the RMS of the reflecting face are calculated with ANSYS for the deployable antenna which embedded into NiTi shape memory alloys and at the different site. According to the discussion, the RMS of the deployable antenna which the SMA are integrated into is diminished. So, SMA are embedded in the deployable antenna control its precision.