Abstract:

The conditions of the deployable units which constitute the double-layer hoop truss deployable antenna mechanism are proposed. A lightweight crank slide block type unit with high stiffness is designed. The comprehensive evaluation index of the unit features is established, and the evaluation and optimization of the element characteristics of the seven types of deployable units are discussed. The structure dimension of the optimally selected deployable unit is optimized, and the optimization design parameters of the deployable unit are also obtained. The structure design of the double-layer hoop truss deployable antenna mechanism with a caliber of 20m is completed. Furthermore, the research not only develops the two kinds of new sample machines, both contained with elastic-plastic hinge, one for the single-layer hoop truss deployable antenna mechanism and the other for unit-structure of the double-layer hoop truss antenna, but also takes experimental verification for the deployable functions and the repeated accuracy of these two sample machines. At last, the correctness and feasibility of the deployable unit proposed in this paper and the large-size hoop truss deployable antenna mechanism are verified.

Key words: Double-layer hoop truss；Deployable antenna, Structure design；Prototype development； Configuration optimization