空间高精度天线多轴机构精密装配与试验技术

Precise Assembly and Test Technology of Space High-precision Antenna Multi-axis Mechanism

空间高精度天线机构通过三级驱动机构串联实现精确控制。针对多个驱动机构装配集成精度高、连接环节多、微重力卸载率大等难点,通过对天线机构装配精度误差分解方法,耦合控制调节多个驱动机构连接参数,采用数字化装调方法控制驱动机构安装精度,实现驱动机构空间轴线位置精度优于0.01°。采用低阻力、高跟随的吊挂式卸载方法,设计两级串联式、二级双自由度微重力模拟系统对天线机构空间环境模拟,高卸载率达到96.1%以上,实现天线机构展开过程中轴线波动误差控制在0.018°以内。通过单级驱动机构安装精确控制、空间多轴线精密装调、高精度模拟卸载技术方法,实现天线机构三轴装配调试后指向精度优于0.042°,满足空间高精度通信与导航定位的指标要求。

The space high-precision antenna mechanism is accurately controlled through the series connection of three-level driving mechanisms.Aiming at the difficulties of high-precision assembly and accuracy integration of multiple drive mechanisms,many connection links,and high microgravity unloading rate,the coupling control adjusts the connection parameters of multiple drive mechanisms by decomposing the assembly accuracy error of the antenna mechanism,and adopts the digital assembly and adjustment method to control the driving mechanism.The installation position accuracy of the spatial axis of the drive mechanism is better than 0.01°.Through the hanging unloading method with low resistance and high follow-up,a two-stage series and two-degree-of-freedom microgravity simulation system is designed to simulate the space environment of the antenna mechanism.The high unloading rate is over 96.1%.The axis fluctuation error is controlled within 0.018°.Through the technical methods of single-stage drive mechanism installation precise control,space multi-axis precise adjustment and high-precision simulation unloading,the pointing accuracy of the antenna mechanism after three-axis assembly and debugging is better than 0.042°,which meets the index requirements of space high-precision communication and navigation positioning.