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建立了组成空间望远镜主镜的超薄扇形子镜的有限元模型,分析了镜面的热变形和影响函数。通过对热变形的分析表明,为了减小空间温度场产生的镜面变形,应该选用具有一定弹性的面形致动器,或者致动器与镜面之间具有一定的相对滑动能力。通过对影响函数的分析表明:对所研究的弹性致动器来说,相邻致动器器之间具有明显的位移耦合,间隔致动器的耦合可以忽略;边缘致动器由于受到的约束比较小,在同样的致动伸长量下,产生的位移大于中心致动器。
The finite element model of the ultra-thin fan-shaped sub-mirror which is composed of the main mirror of the space telescope is established, and the thermal deformation and the influence function of the mirror are analyzed. The analysis of the thermal deformation shows that in order to reduce the mirror deformation caused by the temperature field in the space, a plane-shaped actuator with a certain elasticity should be selected or the relative sliding ability between the actuator and the mirror surface should be selected. The analysis of the influence function shows that for the studied elastic actuator, there is obvious displacement coupling between adjacent actuators, and the coupling of interval actuators can be neglected. Due to the restraint of the edge actuator Is smaller and produces more displacement than the center actuator at the same amount of actuation elongation.