星载薄膜天线人形杆单侧驱动机构设计与试验研究

Here, to meet the on-orbit deployment requirements of spaceborne large caliber thin film antenna, the innovative design and dynamic characteristics of triangular retractable and collapsible (TRAC) boom folding mechanism of space thin film antenna with high profile accuracy, large caliber, lightweight and large folding ratio were studied. Firstly, a one-sided driving mechanism of TRAC boom with radial preload was proposed. Rotary drum and guide screw were driven by a motor at the same time. When the TRAC boom was fully deployed, the radial preloading mechanism was triggered to realize clamping of the root of TRAC boom, and improve stiffness and profile accuracy of deployment state of the whole thin film antenna. The kinematics of the mechanism's winding process and the dynamics of the mechanism's retracted state were simulated, respectively. Finally, the elementary prototype of the one-sided driving mechanism of the TRAC boom was fabricated, the functional tests were conducted for its retraction and deployment, the torque of the TRAC boom in wrapping process was measured, and the overall structure modal analysis of the one-sided driving mechanism in retracted state was done. Moment accuracy of its finite element simulation model in wrapping process was verified with tests to provide a theoretical support for aerospace engineering application of TRAC boom deployment mechanism of spaceborne, large scale, lightweight thin film antennas.