Abstract
During the processing of an optical mirror, the performance parameters of the bottom support system would affect the surface forming accuracy of the mirror. The traditional bottom support system has a large unadjustable support stiffness, which increases the difficulty of unloading the impact force generated by the grinding disc. In response to this scenario, a flexible support system (FSS) consisting of 36 support cylinders with beryllium bronze reeds (BBRs) and rolling diaphragms (RDs) as key components is designed. It is necessary to analyze the key components of the support cylinder to reduce its axial movement resistance, ensure a consistent force output of each support point. First, the internal resistance model of a flexible support cylinder is established, and the main factors of internal resistance are then analyzed. Thereafter, the multi-objective structural parameters of the BBR and RD are simulated in ANSYS using the control variable method. The optimal structural parameters of BBR and RD are determined by simulation. Finally, experiments are performed on the RD ultimate pressure, internal resistance of the support cylinder, and consistency of the force output of the FSS. The experimental results show that the support cylinder with the optimized design has good force output consistency, which provides a theoretical basis for the application of FSS in optical mirror processing.
Highlights
The main components that cause the internal resistance of the support cylinder are the beryllium bronze reed (BBR) and rolling diaphragm (RD)
Where C1 is the distance between the cylinder wall and external piston, Pu is the upper chamber pressure, K1 is the height of the small RD, and E is the elastic modulus of the RD
The blue area with the smallest deformation corresponds to the outer, outer middle, middle, inner middle, and innermost bending positions of the BBR; the angle is within the range 30◦ –50◦ ; and the minimum displacement is approximately 0.05 mm
Summary
They optimized the truss structure size through the weighting method to ensure good dynamic and static performance by large-area, off-axis three-mirror anastigmat space cameras [18] Many of these scholars use flexible support system (FSS) in the field of optical mirror support. The above-mentioned scholars have carried out a substantial amount of research on the support systems of optical mirrors They used the support systems for the installation, positioning, and detection of large-diameter or thin mirrors, by improving traditional mechanisms, designing new support systems, and optimizing mechanism parameters of the support systems. An FSS with adjustable rigidity is designed to enable the adjustment of the rigidity of the bottom support system of a large-scale optical mirror during processing and to effectively unload the impact force generated by the grinding disc.
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