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Foldable tetrahedral structure

A tetrahedron, the fourth technology, applied in the direction of building construction, aerospace vehicles, transportation and packaging, etc., can solve the problems of difficult repeated operations, unfavorable deformation process, and foldable polyhedron with a folding ratio of less than 1.1, etc., to achieve Reduce the instability of installation and manipulation, facilitate installation and use, facilitate transportation and storage

Inactive Publication Date: 2017-02-01
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing spatially expandable structures mainly involve folding on planes or curved surfaces, such as solar panels and satellite antennas, while folding mechanisms involving volume are mainly obtained by non-rigid deformation. The deformation process is not conducive to control and is not easy to repeat. , the existing expandable polyhedron that adopts rigid deformation is either complex in structure, such as the foldable polyhedron structure driven by a regular polygon mechanism proposed by C.M.Gosselin and D.Gagnon-Lachance in 2006; or it cannot be completely folded, such as Kiper and The folding ratio of the foldable polyhedron proposed in 2009 is less than 1.1

Method used

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Experimental program
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Embodiment 1

[0047] Such as figure 1 As shown, this embodiment provides a foldable tetrahedral structure, including a symmetry axis 1, four folding units: first folding unit T1, second folding unit T2, third folding unit T3, fourth folding unit Folding unit T4; and six rod units: first rod unit B1, second rod unit B2, third rod unit B3, fourth rod unit B4, fifth rod unit B5, sixth rod unit B6. Each folding unit is provided with three connecting positions that are not on the same straight line, which are respectively called the first connecting position, the second connecting position and the third connecting position of each folding unit; the two ends of each rod unit are respectively provided with connecting positions , respectively referred to as the first connection position and the second connection position of each rod unit. The expandable tetrahedral structure also has a line of symmetry, that is, the axis of symmetry 1 .

[0048] The structures of the first folding unit T1, the se...

Embodiment 2

[0062] A more preferred situation is:

[0063] The first folding unit T1, the second folding unit T2, and the third folding unit T3 all have the outline of an isosceles triangle; the first apex, the second apex, and the third apex of the isosceles triangle are respectively the first folding unit T1, the The first connection position, the second connection position and the third connection position of the second folding unit T2 and the third folding unit T3 respectively. The fourth folding unit T4 has an outline of an equilateral triangle, and the first apex, the second apex and the third apex of the equilateral triangle are respectively the first connection position, the second connection position and the third connection position of the fourth folding unit T4 .

[0064] The first end point and the second end point of the first bar unit B1, the second bar unit B2, the third bar unit B3, the fourth bar unit B4, the fifth bar unit B5, and the sixth bar unit B6 are their first ...

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Abstract

The invention relates to a foldable tetrahedral structure with a single degree of freedom and a large folding-unfolding ratio, and discloses a foldable tetrahedral structure. The foldable tetrahedral structure comprises four folding units, six bar units and a symmetry axis, wherein the connection positions on the four folding units are connected with the connection positions on the six bar units through rotating pairs or spherical pairs, and a closed polyhedral structure is formed; and besides, the units and the kinematic pairs meet a series of symmetrical relationships and constraint conditions with respect to the symmetry axis, and therefore an octahedral structure capable of being folded into the tetrahedral structure is established. The foldable tetrahedral structure can achieve a folded state and an unfolded state stably, when being folded, the structure is small in size and convenient to launch or transport, and when being unfolded, a large working space is achieved. The whole foldable tetrahedral structure only has one degree of freedom and has the advantages that production and processing are easy, movement control is convenient, and reliability is high. The foldable tetrahedral structure has great significance and broad application prospects in numerous fields such as aerospace and civil engineering.

Description

technical field [0001] The invention relates to a foldable polyhedron structure with a single degree of freedom and a large fold-to-expand ratio, in particular to a foldable tetrahedron structure which realizes transformation between an octahedron and a tetrahedron by a single drive. Background technique [0002] Due to its good symmetry, polyhedral structures are widely used in aerospace, architectural structures, artworks and daily life. However, due to their large size and unfavorable transportation, polyhedral structures are often only used in fixed occasions. Cube small satellites, which were rated as one of the top ten scientific and technological breakthroughs in 2014 by the SCIENCE journal, are typical representatives of the aerospace field in pursuit of miniaturization and low-cost launch. However, the shortcoming of its small working space in the orbital state also restricts its further application. [0003] The space foldable structure is a new type of structure b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/22B64G1/44E04B1/344
CPCE04B1/344E04B1/3447B64G1/222B64G1/44
Inventor 陈焱杨富富康荣杰马家耀
Owner TIANJIN UNIV
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