Hybrid assembly and alignment method for large-aperture space mirrors

Résumé fourni par la source

High-orbit, high-resolution remote sensing satellites are increasingly applied in both military and civilian fields due to their advantages of wide imaging swath and continuous observation capabilities. The optical aperture diameter of such satellites typically exceeds 3 meters, leading to correspondingly larger primary mirrors in their optical systems. The Wiffletree support structure is a commonly used method for large mirrors, offering strong flexibility for load relief; however, its complex structural design usually requires the use of dedicated alignment and assembly devices with the same size as the mirror during installation to control positioning accuracy and assembly stress. This paper proposes a hybrid assembly and adjustment method that integrates a six-bar parallel structure with the Wiffletree structure. By embedding a six-bar parallel mechanism within the Wiffletree components, the parallel structure is used to support and adjust the mirror's position. After precise alignment, the Wiffletree structure is fixed, and the parallel mechanism is then disassembled. This method was experimentally validated in the assembly of a 1.3-meter-diameter mirror, demonstrating its ability to achieve accurate positioning and assembly of large-aperture mirrors without external alignment devices. The results show that this approach effectively addresses challenges related to high manufacturing costs and limited applicability of traditional large-aperture mirror alignment systems.

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