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目的研究预应力杆对大型空间桁架天线固有频率影响,提出采用作动器实时对在轨空间天线低阶固有频率进行调整,主动避免共振现象发生。方法针对大型空间桁架天线结构有限元模型,采用降温法对桁架杆施加预应力,重点分析预应力大小、预应力杆位置、预应力杆数量对整体结构固有频率的影响。结果增加预应力大小、合理布置预应力杆位置、增加预应力杆数量能够增加空间桁架天线固有频率的改变率。结论合理优化空间桁架天线上预应力杆,可实现对在轨运行的空间桁架天线低阶固有频率实时调整,可为空间桁架天线避振设计提供参考。
Aim To study the influence of prestressing bar on the natural frequency of large space truss antenna, and propose to use actuator real-time to adjust the low-order natural frequency of antenna in orbit, and avoid the resonance phenomenon proactively. Methods According to the finite element model of large space truss antenna structure, the prestressing force was applied to the truss rod by cooling method. The influence of the prestressing force, the position of the prestressing rod and the number of prestressed rods on the natural frequency of the monolithic structure were analyzed emphatically. Results Increasing the size of prestressing, arranging the prestressed rod position rationally and increasing the number of prestressed rods can increase the rate of change of the natural frequency of the space truss antenna. Conclusions Reasonable optimization of the prestressed bars on the space truss antenna can realize the real-time adjustment of the low-order natural frequency of the space truss antenna in orbit, which can provide a reference for the design of the space truss antenna.