9RR-12URU-3URU symmetrical extendable basic unit mechanism

Abstract

A 9RR-12URU-3URU symmetrical extendable basic unit mechanism includes 10 face plates, 9 swing rods with equal lengths, 6 folded rods I, 6 folded rods II, 3 folded rods III, 33 revolute pairs (R) and 30 Hooke joints (U). Six of the face plates at the periphery in the upper layer are connected with the central face plate through the folded rods I and are connected with each other through the folded rods II. Three of the face plates in the lower layer are connected to each other through the folded rods III. Each of the folded rods is formed by connecting two connecting rods of equal lengths through one of the revolute pairs, and two ends of the folded rod are connected with the face plates through the Hooke joints. Each of the face plates in the lower layer is connected with the central face plate and two of the face plates at the periphery in the upper layer through three of the swing rods. Two ends of each swing rod are connected with the face plates through the revolute pairs. The central face plate and the face plates at the periphery in the upper layer are on the same spherical surface and form a regular hexagon with the face plates at the periphery as vertices. The mechanism is simple in structure, high in rigid, and easy for implementation of engineering manufacture. The mechanism can fold all face plates simultaneously and can adjust the folded face plate attitudes, and has a high folding ratio.

Description

technical field [0001] The invention relates to a space expandable mechanism, in particular to a symmetrical expandable basic unit mechanism. Background technique [0002] With the high-gain requirements of spaceborne antennas in key aerospace fields such as electronic reconnaissance, data relay, and ground navigation, the demand for large-aperture reflectors has become more and more urgent. However, limited by the carrying space of the actual vehicle, it is required that the large-aperture reflector can be fully retracted during the launch phase, and can be fully deployed to the working state by its own power source after entering orbit. Since the deployable mechanism can freely switch between its initial compact configuration and the unfolded configuration in the working state, it has broad application prospects in the aerospace field. [0003] According to the reflector feeding form, aperture parameters, storage requirements and mesh accuracy, research institutions in th...

AI Technical Summary

Problems solved by technology

[0004] The deployable mechanism composed of different basic units through different networking methods has different performances. At present, the types of basic deployable units of the truss-type deployable mechanism proposed at home and abroad are still relatively small, which brings great challenges to the design of new large-aperture reflectors. here comes some difficulty

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