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作为星载大型天线的典型结构形式,大型环形桁架天线在新一代大型通信卫星、中继卫星、对地观测卫星等中需求迫切,且需求的口径越来越大.然而随着天线口径的增大,天线展开所需要的驱动力也急剧增大,使得传统的电机-动力绳集中式驱动展开方式存在展开可靠性的问题.本文建立了大型环形桁架天线动力学仿真模型,对集中式电机驱动展开过程进行了仿真,揭示了集中式驱动下电机动力在传力路径上摩擦损失而导致的展开不同步问题,并对其展开过程能量消耗进行了分析,总结了集中式驱动存在的不足.在此基础上给出了一种基于负刚度驱动装置的分布式驱动展开方法,并通过数值算例验证了其有效性.
As a typical structure of a spaceborne large antenna, the large-sized annular truss antenna is in urgent need of a new generation of large communications satellites, relay satellites, earth observation satellites, etc., and the demand is growing. However, as the antenna aperture increases The driving force required for large and large antenna deployment also increases sharply, making the traditional motor-power cable centralized deployment unfolded with reliability issues.This paper established a large-scale truss antenna dynamics simulation model, The process is simulated to reveal the unsynchronized expansion caused by the friction loss of motor power under the centralized drive, and the energy consumption during its deployment is analyzed, and the shortcomings of the centralized drive are summarized. Based on this, a distributed driving expansion method based on negative stiffness driving device is given. Numerical examples are given to verify its effectiveness.