基于拉索的航天器挠性部件在轨增频技术研究

航天器上的太阳电池阵等挠性部件基频较低、低频模态密集,可能会与器上活动部件产生耦合和共振,对航天器姿态及载荷工作等产生不良影响。针对此问题,文章提出用主动张紧拉索装置来调节挠性部件的频率。在调研国内外技术的基础上,分析了悬臂梁模型中支撑刚度对系统模态的影响,建立拉索增频的动力学模型并进行仿真;依据原理性试验仿真结果,设计了器上增频机构,并完成了相关地面试验验证和在轨飞行验证。本研究对于航天器挠性部件的增频和错频等技术措施的实施具有参考价值。

Frequency-increasing technology of spacecraft flexible attachment based on tension cable system

The flexible appendages feature a relatively low fundamental natural frequency and closely distributed low-frequency coupling modes, so for a satellite with flexible appendages and moving parts, the frequency coupling and the resonance might be an issue to affect the attitude of the satellite. To solve this problem, a method is proposed in this paper to regulate the natural frequency of the flexible appendages. Firstly, the relevant domestic and foreign studies are reviewed. Then simplified model of a spring with unidirectional stiffness on a simple beam is established, and the effect of the brace stiffness on the system modes is analyzed. A dynamical model of the active tension cable and the flexible appendages is built for simulations, to test the influence of the stiffness of cable on the system modes, and to obtain the force on and the best position of the cable. At last, the complete device is designed, with validation by ground test and flight experiment.