Non-Interface Gravity Unloading Method for Large Aperture Off-Axis Space Telescopes

Table 1. Position and attitude of primary and secondary mirrors under gravity
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Table 1. Position and attitude of primary and secondary mirrors under gravity
Item ΔX /μm ΔY /μm ΔZ /μm
Δθ_x /
（″）
Δθ_y /
（″）
Δθ_z /
（″）
Primary mirror 0.0 45.3 0.0 2.9 0.0 -15.9
Secondary mirror 0.1 89.5 0.0 4.6 0.1 -25.4
Difference value 0.1 44.2 0.0 1.7 0.1 9.5

Table 2. Method of gravity unloading

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Table 2. Method of gravity unloading

Sling suspension	Multi-point suspension	Multi-point vertical support	Multi-point normal support	Top suspension + normal support
Does not change the original structure	Requires additional suspension points	Requires additional horizontal surfaces	Does not change the original structure	Requires additional suspension points
Large volume	Large volume	Small volume	Small volume	Large volume
Poor unloading effect	Moderate unloading effect	Good unloading effect	Moderate unloading effect	Best unloading effect

Table 3. Position and attitude of primary and secondary mirrors after unloading
View table
Table 3. Position and attitude of primary and secondary mirrors after unloading
Item ΔX /μm ΔY /μm ΔZ /μm
Δθ_x /
（″）
Δθ_y /
（″）
Δθ_z /
（″）
Primary mirror 0.6 36.2 -0.2 0.4 0.1 -2.6
Secondary mirror -4.0 40.8 -1.2 0.9 -1.1 -4.8
Difference value 4.6 4.6 1.0 0.5 1.2 2.2

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Qijia He, Qi Peng, Zhiyun Hou, Qihong Bao, Zhikun Yang. Non-Interface Gravity Unloading Method for Large Aperture Off-Axis Space Telescopes[J]. Laser & Optoelectronics Progress, 2025, 62(9): 0922003

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