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Single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of same

A scalable and free technology, which is applied in the direction of motor vehicles, space navigation equipment, space navigation aircraft, etc., can solve the problems of immature technology, low stiffness, and many hinge points, and achieve good deployment performance, good seismic performance, The effect of large folding ratio

Active Publication Date: 2016-07-27
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the unfolding and folding methods of the expandable mechanism, the expandable mechanism can be divided into hinged truss type expandable mechanism, deformable material expandable mechanism and inflatable expandable expandable mechanism. The hinged truss type expandable mechanism is mainly composed of connecting rods and kinematic pairs. , this kind of mechanism has the advantages of large folding and folding ratio, high precision, good repeatability and long life, and has been widely used in the fields of space station basic frame, space extension arm and large-diameter folding antenna. The mechanism also has the disadvantages of many hinge points, more degrees of freedom, complex construction process, and complex control.
The expandable mechanism of denatured material adopts the material with large elastic deformation as the main material of the expandable mechanism. In the folded state, the material deforms and stores the elastic deformation energy. After release, it relies on the elastic modification to drive the mechanism to transform into the unfolded state. The construction process is relatively Simple, but poor repeatability and low precision
The principle of the inflatable expandable mechanism is to make a closed structure with flexible materials. After entering the orbit, the closed structure is expanded by filling gas. It has the advantages of small mass and large folding ratio, but the shape and surface accuracy is low. The thermal stability of the structure is poor, the rigidity is low, and the technology is not yet mature

Method used

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  • Single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of same
  • Single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of same
  • Single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] exist figure 1 In the schematic diagram of the single-degree-of-freedom constrained scissor-type deployable unit shown, the eight scissor bars have the same structure, two scissor bars form a group, and the middle of the two scissor bars is connected by a rotating pair, and the eight scissor bars A total of four sets of scissor folding rods are formed, and the four groups of scissor folding rods are symmetrically distributed on the four sides of the basic expandable unit, and the folding and extending directions of the scissor folding rods on the opposite side are the same; the structure of the sixteen connecting rods is exactly the same , two connecting rods form a group, and one end of the two connecting rods is connected by a rotating joint. Sixteen connecting rods form eight groups of folding connecting rods, which are symmetrically distributed on the upper and lower two sides of the basic expandable unit. On the surface, there are four sets of folding connecting ro...

Embodiment 2

[0031] Such as Figure 4-Figure 6 As shown, the first space expandable mechanism composed of single-degree-of-freedom constrained scissor-type expandable units includes a plurality of basic expandable units. The components and connection methods of each basic expandable unit are the same as those in Embodiment 1. The expansion units are arranged horizontally in order, and the adjacent basic expandable units share four flower discs and a set of scissor folding rods, wherein the four ends of the shared set of scissor folding rods are respectively inserted into the middle slots of the four shared flower discs , connected to the faceplate through the rotating pair, the two ends of the adjacent two sets of folding connecting rods are respectively inserted into the left notches of the four shared faceplates, and connected to the faceplate through the rotating pair, the two adjacent folding connecting rods of the other two groups The ends are respectively inserted into the right slot...

Embodiment 3

[0036] Such as Figure 7-Figure 9 As shown, the second-space expandable mechanism composed of single-degree-of-freedom constrained scissor-type expandable units includes a plurality of basic expandable units, which are arranged horizontally and vertically in sequence, and adjacent basic expandable units share Four faceplates and a set of scissors folding rods are connected in the same way as the expandable mechanism in the first space; by changing the number of basic expandable units, the size of the expandable mechanism in the second space can be changed.

[0037] The horizontal arrangement and connection relationship of a plurality of basic expandable units are the same as those in Embodiment 2. When arranged vertically, the third scissor bar 11 and the fourth scissor bar 16 of the first basic expandable unit pass through the rotating pair in the middle. The second scissors folding bar connected is the common scissors folding bar with the second longitudinal basic expandable...

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Abstract

The invention discloses a single-degree-of-freedom overconstrained shear-type deployable unit and space deployable mechanisms composed of the same. The single-degree-of-freedom overconstrained shear-type deployable unit comprises eight disc chucks, four sets of shear fork folding rods and eight sets of folding connecting rods; one set of the folding connecting rods limit the deployable degree of the basic deployable units by depending on the length of the connecting rods, the other seven sets of the folding connecting rods are all overconstrained connecting rods, and the overconstrained connecting rods can effectively improve the rigidity of the basic deployable units. Accordingly, the basic deployable units can be sequentially arranged in order, every two adjacent deployable units can form the first space deployable mechanism and the second space deployable mechanism by sharing four of the disc chucks and one set of the shear fork folding rods, and the length of the first space deployable mechanism and the size of the second space deployable mechanism can be changed by changing the quantity of the basic deployable units. The single-degree-of-freedom overconstrained shear-type deployable unit is simple in structure, has the high structural symmetry and is suitable for constructing an extendable space mast, a solar battery array support and a satellite plane reflecting antenna.

Description

technical field [0001] The invention relates to an expandable mechanism, in particular to a space expandable mechanism. Background technique [0002] With the development of the aerospace industry, the size of the space mechanism required in aerospace engineering is getting larger and larger to meet the needs of different space missions. However, due to the space constraints of the space vehicle, the space mechanism must be folded and folded during the launch phase. In the fairing, after the spacecraft enters the orbit, it will be deployed to the working state by its own power source. In space missions such as space stations, communication satellite platforms, space telescopes, earth observation, and planetary exploration, various types of space folding mechanisms have been rapidly developed and applied, such as folding solar panels, basic skeletons of space stations, and space manipulators. , space extension arm, large-diameter folding antenna, large flexible solar panel s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/22
CPCB64G1/22B64G1/222
Inventor 赵永生韩博许允斗姚建涛刘文兰张东胜陈亮亮
Owner YANSHAN UNIV
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