星载SAR天线展开冲击特性及抑制方法OA

To address the problem that excessive impact load at the end of deployment,caused by using a spiral spring as the driving source in a spaceborne deployable planar synthetic aperture radar(SAR)anten-na,led to spacecraft instability and degraded antenna deployment accuracy,a suppression approach was proposed and experimentally validated.First,a deployment dynamics model driven by a spiral spring was established,and the linear relationship between the impact torque at deployment completion and the termi-nal angular velocity was derived.Then,a viscous damper was introduced along the axis of the deployment driving hinge to suppress the impact,and its effectiveness was verified through dynamic simulations and ex-periments.Subsequently,measurement methods for the deployment impact torque and pointing error were proposed,and comparative tests under both damped and undamped conditions were carried out to evaluate the deployment impact torque and pointing accuracy.Finally,based on experimental data,the lin-ear relationship between deployment impact and angular velocity was further obtained,and an on-orbit im-pact estimation method was proposed.The experimental results show that,after introducing the damper,the deployment impact torque is reduced by 92.8%.Meanwhile,the maximum pointing error decreases from 26 arcsec to 12 arcsec,and the repeatability improves from 36 arcsec to 15 arcsec.These results demonstrate that installing a viscous damper in the deployment driving hinge can effectively suppress de-ployment impact and improve antenna deployment accuracy.