Abstract
This paper explores the design of a new type of deployable frame composed of three groups of linear bracings in the longitudinal direction and two planar circular trusses at both ends. The primary novelty in this work is the deployable rigid frame covered with flexible membranes. The deployable system has a large folding ratio as well as reliable driving and locking systems. Kinematic equations were established with relevant constraint formulas for the rigid bodies using Moore–Penrose generalized inverse matrix, whereas the vector finite element method was employed for the flexible membrane. Meanwhile, dynamic analysis confirmed the structural stiffness. Finally, a model of the deployable optical baffle was fabricated and assembled, of which the successful and stable deployment shows the feasibility of the deployable scheme. Therefore, the proposed deployable optical baffle provides theoretical guidance and methodological support for the design of large space telescopes.
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