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为控制大型桁架展开机构在低地轨道(Low Earth Orbit,LEO)上的热变形,建立相应的热分析有限元模型,提出3种热控涂层备选方案.根据不同方案计算出机构在LEO上运行4个周期的瞬态温度场,并以最后一个周期的瞬态温度场为基础计算机构的热变形.对热变形的结果进行比较,选取变形值最小的热控涂层方案进行优化,使3根主梁的温差达到最小,从而有效控制桁架展开机构的热变形.
In order to control the thermal deformation of the large-scale truss expansion mechanism in Low Earth Orbit (LEO), a corresponding finite element model of thermal analysis was established and three kinds of thermal control coating alternatives were proposed. According to different schemes, Run the transient temperature field of 4 cycles and calculate the thermal deformation of the mechanism on the basis of the transient temperature field of the last cycle.Comparing the results of thermal deformation and selecting the thermal control coating with the smallest deformation value to optimize The temperature difference of the three main girders is minimized, so as to effectively control the thermal deformation of the truss expanding mechanism.