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轴向支撑对大口径主镜的定位及镜面变形有着重要的作用,为了深入开展该课题的研究,在传统机械Whiffle-tree支撑的基础上引入了轴向液压Whiffle-tree支撑。首先,从三点运动学定位支撑原理出发,介绍了Whiffle-tree支撑的特点与分类,着重对比分析了液压Whiffle-tree和机械Whiffletree支撑的优缺点。进而,根据液压Whiffle-tree的特点,分析推导了其建模方法,并运用该方法对一块18点液压轴向支撑的大口径主镜进行了静力学分析与优化,拟合后镜面变形RMS值为18.6 nm,满足设计要求。同时通过对不同建模分析结果的对比,验证了该建模方法的合理性和正确性,为大口径主镜的轴向支撑分析提供了一种参考。
Axial support plays an important role in the positioning and mirror deformation of the large-aperture primary mirror. In order to further study this topic, the axial hydraulic Whiffle-tree support is introduced based on the traditional mechanical Whiffle-tree support. First of all, based on the principle of three-point kinematics positioning support, the characteristics and classification of Whiffle-tree support are introduced. The advantages and disadvantages of hydraulic Whiffle-tree and mechanical Whiffletree support are emphatically analyzed. Furthermore, according to the characteristics of hydraulic Whiffle-tree, the modeling method is deduced and analyzed. With this method, a static analysis and optimization of an 18-point hydraulic large-diameter primary mirror with axial support are carried out. The RMS value of the mirror deformation 18.6 nm, meeting design requirements. At the same time, by contrasting the results of different modeling and analysis, the rationality and correctness of this modeling method are validated, which provides a reference for axial support analysis of large aperture primary mirror.