CN108397684B - Dual stiffness structure - Google Patents

Dual stiffness structure Download PDF

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Publication number
CN108397684B
CN108397684B CN201810181713.0A CN201810181713A CN108397684B CN 108397684 B CN108397684 B CN 108397684B CN 201810181713 A CN201810181713 A CN 201810181713A CN 108397684 B CN108397684 B CN 108397684B
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China
Prior art keywords
connecting rod
type connecting
central
peripheral diamond
combination
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Expired - Fee Related
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CN201810181713.0A
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CN108397684A (en
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崔志铭
朱宰亨
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
    • F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
    • F16S3/06—Assemblies of elongated members
    • F16S3/08—Assemblies of elongated members forming frameworks, e.g. gratings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

A dual-stiffness intelligent structure, consisting of a plurality of structural units, each structural unit comprising: two concentric rotationally connected central scissor link combinations and a plurality of peripheral diamond link combinations, wherein: the two central scissor type connecting rod combinations are movably connected through a rotating spring, the tail end of a branch of each central scissor type connecting rod combination is rotatably connected with one end node of one peripheral diamond type connecting rod combination, and the other two opposite end nodes of the peripheral diamond type connecting rod combination are respectively rotatably connected with the end nodes of the peripheral diamond type connecting rod combinations adjacent to the two sides. The present invention has two modes of deformation and exhibits different stiffness in the two modes.

Description

Dual stiffness structure
Technical Field
The invention relates to a technology in the field of material structures, in particular to a double-rigidity structure.
Background
The stiffness of a material is one of its most important properties, reflecting the degree of deformation of a material under load. Due to different application fields, the rigidity requirement of the material is different. In the field of infrastructure, the material is generally expected to have higher strength so as to reduce deformation to the greatest extent when bearing larger load and avoid building collapse; in the fields of shock absorption and buffering, the material is expected to have smaller rigidity and larger deformation so as to convert the kinetic energy of the target into the deformation energy of the material and enhance the shock absorption and buffering effects.
In some cases, however, a material with a single stiffness may be insensitive to smaller load changes (stiffer material) or fail under larger loads (less stiff material) due to the larger range of load changes.
Disclosure of Invention
The invention provides a double-rigidity intelligent structure aiming at the problem that the existing single-rigidity material cannot provide proper deformation in the face of large-range load change, and the double-rigidity intelligent structure has two deformation modes and shows different rigidity in the two modes.
The invention is realized by the following technical scheme:
the invention relates to a double-rigidity intelligent structure, which consists of a plurality of structural units, wherein each structural unit comprises: two concentric rotationally connected central scissor link combinations and a plurality of peripheral diamond link combinations, wherein: the two central scissor type connecting rod combinations are movably connected through a rotating spring, the tail end of a branch of each central scissor type connecting rod combination is rotatably connected with one end node of one peripheral diamond type connecting rod combination, and the other two opposite end nodes of the peripheral diamond type connecting rod combination are respectively rotatably connected with the end nodes of the peripheral diamond type connecting rod combinations adjacent to the two sides.
The central scissor link assembly comprises: more than three central scissor type connecting rods with one ends fixedly connected through a central hinge, and each branch central scissor type connecting rod is uniformly distributed by taking the central hinge as the center.
The peripheral diamond-shaped connecting rod combination comprises four peripheral diamond-shaped connecting rods which are connected in a rotating mode in sequence at the tail ends.
And the fourth end node of the peripheral diamond-shaped connecting rod combination is used for being rotatably connected with the peripheral diamond-shaped connecting rod combination of another adjacent structural unit or not connected with any node.
The stiffness coefficients of the rotary springs in all the structural units are the same and are a fixed value k.
The number of nodes and the number of branches of the central scissors-type connecting rod combination and the number and the shape of the peripheral diamond-shaped connecting rod combination meet the following requirements: when the number of branches of the central scissor type connecting rod combination is n, the number of nodes is n +1, the number of peripheral diamond type connecting rod combinations is 2n, the shape of the peripheral diamond type connecting rod combination is determined by the angle of one internal angle of the peripheral diamond type connecting rod combination, and the size of the peripheral diamond type connecting rod combination is 2 pi/n.
The structural units are arranged in the horizontal and vertical directions, and the distance between two adjacent units is the width and the height of the structural units.
Technical effects
Compared with the prior art, the invention utilizes the characteristic that the structure has different rigidity under different motion modes, and can automatically select the required motion mode and the structural rigidity thereof by changing the position of the load point, thereby realizing the function of changing the rigidity under different loads. Further, according to the load-displacement curve provided by us, the deformation degree of the structure under a given load, namely the strain magnitude of the intelligent structure, can be calculated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: a to d are MS-6, MS-8, MS-10 and MS-12;
FIG. 2 is a schematic view of the movement pattern of the present invention;
FIG. 3 is a graph of load position versus motion pattern for the present invention;
FIG. 4 is a load-displacement graph of the present invention;
FIG. 5 is a schematic of tiling according to the present invention;
in the figure: a to d are MS-6, MS-8, MS-10 and MS-12;
in the figure: 1 is MS-6(Motion structures with 6-fold rotational symmetry) peripheral diamond connecting rod, 2 is MS-6 central scissors type connecting rod, 3 is MS-6 rotating spring, 4 is MS-8(Motion structures with 8-fold rotational symmetry) peripheral diamond connecting rod, 5 is MS-8 central scissors type connecting rod, 6 is MS-8 rotating spring, 7 is MS-10(Motion structures with 10-fold rotational symmetry, Motion structures with ten-fold rotational symmetry) peripheral diamond connecting rod, 8 is MS-10 central scissors type connecting rod, 9 is MS-10 rotating spring, 10 is MS-12(Motion structures with 12-fold rotational symmetry, Motion structures with twelve-fold rotational symmetry) peripheral diamond connecting rod, The 11 is MS-12 central scissor type connecting rod, and the 12 is MS-12 rotating spring.
Detailed Description
As shown in FIG. 1, the four dual-stiffness intelligent structures of the present invention are a six-fold rotational symmetry movable structure MS-6, an eight-fold rotational symmetry movable structure MS-8, a ten-fold rotational symmetry movable structure MS-10, and a twelve-fold rotational symmetry movable structure MS-12.
As shown in FIG. 1a, the structural unit is a structural unit of an MS-6 dual-stiffness intelligent structure, wherein different parts are represented by different line types, and the structural unit comprises six MS-6 peripheral diamond-shaped connecting rod 1 combinations, two (solid lines and dotted lines) MS-6 central scissor-shaped connecting rod 2 combinations and one MS-6 rotating spring 3; as shown by the dotted line square in FIG. 1a, each MS-6 peripheral diamond-shaped connecting rod 1 combination has four nodes, each MS-6 central scissors type connecting rod 2 combination has three branches and four nodes, two MS-6 central scissors type connecting rod 2 combinations are rotatably connected through a central hinge, the branches of each MS-6 central scissors type connecting rod 2 combination are rotatably connected with one MS-6 peripheral diamond-shaped connecting rod 1 combination, and each MS-6 peripheral diamond-shaped connecting rod 1 combination is rotatably connected with two adjacent MS-6 peripheral diamond-shaped connecting rods 1 combinations. The MS-6 rotation spring 3 is provided at the center hinge.
As shown in FIG. 1b, the structural unit of the MS-8 dual-stiffness intelligent structure comprises eight MS-8 peripheral diamond-shaped link 4 combinations, two MS-8 central scissor-shaped link 5 combinations and one MS-8 rotating spring 6, as shown by a dotted square in FIG. 1. Each MS-8 peripheral diamond-shaped link 4 combination has four nodes and each MS-8 central scissor link 5 combination has four branches and five nodes. Two MS-8 central scissor type connecting rod 5 combinations are rotationally connected through a central hinge, a branch of each MS-8 central scissor type connecting rod 5 combination is rotationally connected with one MS-8 peripheral diamond type connecting rod 4 combination, and each MS-8 peripheral diamond type connecting rod 4 combination is also rotationally connected with two adjacent MS-8 peripheral diamond type connecting rod 4 combinations. The MS-8 rotation spring 6 is provided at the central hinge.
As shown in FIG. 1c, the structural unit of the MS-10 dual-stiffness intelligent structure comprises ten MS-10 peripheral diamond-shaped link 7 combinations, two MS-10 central scissor-shaped link 8 combinations and one MS-10 rotating spring 9, as shown by a dashed box in FIG. 1. Each MS-10 peripheral diamond shaped link 7 combination has four nodes, and each MS-10 central scissor link 8 combination has five branches and six nodes. Two MS-10 central scissor type connecting rod 8 combinations are rotationally connected through a central hinge, a branch of each MS-10 central scissor type connecting rod 8 combination is rotationally connected with one MS-10 peripheral diamond type connecting rod 7 combination, and each MS-10 peripheral diamond type connecting rod 7 combination is also rotationally connected with two adjacent MS-10 peripheral diamond type connecting rods 7 combinations. The MS-10 rotation spring 9 is provided at the central hinge.
As shown in FIG. 1d, it is a structural unit of the MS-12 dual stiffness intelligent structure, which comprises twelve MS-12 peripheral diamond-shaped link 10 combinations, two MS-12 central scissors-type link 11 combinations, and one MS-12 rotating spring 10, as shown by the dashed square in FIG. 1. Each MS-12 peripheral diamond shaped link 10 combination has four nodes, and each MS-12 central scissors link 11 combination has six branches and seven nodes. Two MS-12 central scissor type connecting rod combinations 11 are rotatably connected through a central hinge, a branch of each MS-12 central scissor type connecting rod combination 11 is rotatably connected with one MS-12 peripheral diamond type connecting rod combination 10, and each MS-12 peripheral diamond type connecting rod combination 10 is also rotatably connected with two adjacent MS-12 peripheral diamond type connecting rod combinations 10. The MS-12 rotation spring 12 is disposed at the center hinge.
As shown in FIG. 2, in the initial state, the six branches of the two MS-6 center scissor linkages 2 are evenly distributed around the center hinge, and the MS-6 rotation spring 3 is in the original length state. Under certain load, the MS-6 has two motion modes: mode 1 and mode 2 are shown in the left and right columns of fig. 2. Similarly, in the initial state, all branches of the central scissor type connecting rod combination of the MS-8, the MS-10 and the MS-12 are uniformly distributed around the central hinge, and the corresponding rotating springs are in the original length state.
As shown in FIG. 3, MS-6, MS-8, MS-10, MS-12 (collectively referred to as MS-N) may switch between the two motion modes depending on the location of the load point. For vertical loads, when the load point is to the left of point R, MS-N exhibits a motion pattern of 1; when the load point is to the right of point R, MS-N exhibits a motion pattern of 2. For horizontal loading, when the loading point is below the R point, MS-N shows a motion mode 1; when the load point is above the R point, MS-N exhibits a motion pattern of 2.
As shown in fig. 4, a load-displacement graph of the present embodiment is shown. For MS-6, when the load point is E, MS-6 exhibits a movement pattern 1, corresponding to the dotted line in the figure; when the load point is F, MS-6 exhibits a movement pattern 2, corresponding to the solid line in the figure. For MS-8, MS-10, MS-12, when the load point is D, MS-8, MS-10, MS-12 shows the movement pattern 1, corresponding to the dotted line in the figure; when the load point is F, MS-8, MS-10, MS-12 exhibit movement pattern 2, corresponding to the solid line in the figure. According to the displacement-load curve diagram, the deformation degree of MS-N under a given load can be obtained.
Fig. 5 is a schematic view of tiling in this embodiment. As can be seen from fig. 5, the last node of each MS-6 peripheral diamond-shaped connecting rod 1 combination is rotatably connected with the vacant nodes of other MS-6 structural units; the last node of each MS-8 peripheral diamond-shaped connecting rod 4 combination is rotatably connected with the vacant nodes of other MS-8 structural units; the last node of the six MS-10 peripheral diamond connecting rod 7 combinations is rotationally connected with the vacant nodes of other MS-10 structural units, and the last node of the four MS-10 peripheral diamond connecting rod 7 combinations is not connected with any other node; the last node of the six MS-12 peripheral diamond-shaped connecting rod 10 combinations is rotatably connected with the vacant nodes of other MS-12 structural units, and the last node of the six MS-12 peripheral diamond-shaped connecting rod 10 combinations is not connected with any other node.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (8)

1. A dual-rigidity intelligent structure is characterized by being composed of a plurality of structural units, and each structural unit comprises: two concentric rotationally connected central scissor link combinations and a plurality of peripheral diamond link combinations, wherein: the two central scissor type connecting rod combinations are movably connected through a rotating spring, the tail end of a branch of each central scissor type connecting rod combination is rotatably connected with one end node of one peripheral diamond type connecting rod combination, and the other two opposite end nodes of the peripheral diamond type connecting rod combination are respectively rotatably connected with the end nodes of the peripheral diamond type connecting rod combinations adjacent to the two sides;
the double-rigidity intelligent structure has an initial state and two motion modes;
the initial state is as follows: the two central shear type connecting rods are combined and evenly distributed circumferentially by taking the central hinge as a circle center, and the rotating spring is at the original length;
the two motion modes are respectively as follows: the movable central scissor type connecting rod rotates clockwise and anticlockwise relative to the fixed central scissor type connecting rod, the double-rigidity intelligent structure shows different rigidities through an initial state and two movement modes corresponding to the stretching and the compression of the rotating spring, and the double-rigidity intelligent structure moves on the structure along with the action point of a load to trigger different movement modes so as to generate corresponding rigidity.
2. A dual stiffness smart structure as defined in claim 1 wherein said central scissor link assembly comprises: more than three central scissor type connecting rods with one ends fixedly connected through a central hinge, and each branch central scissor type connecting rod is uniformly distributed by taking the central hinge as the center.
3. A dual-stiffness intelligent structure as claimed in claim 1, wherein the number of branches of the central scissors-type linkage in the central scissors-type linkage combination is three, four, five or six.
4. The dual-rigidity intelligent structure as claimed in claim 1, wherein the peripheral diamond-shaped connecting rod assembly comprises four peripheral diamond-shaped connecting rods which are connected end to end in a rotating manner.
5. A dual stiffness intelligent structure as claimed in claim 1, wherein the fourth end node of the peripheral diamond shaped link assembly is adapted to be pivotally connected to the peripheral diamond shaped link assembly of another adjacent structural unit or is not connected to any node.
6. A dual stiffness smart fabric as claimed in claim 1 wherein the stiffness coefficients of the rotational springs in all the fabric cells are the same and are a fixed value k.
7. The dual-rigidity intelligent structure of claim 1, wherein the number of nodes and branches of the central shear type connecting rod combination and the number and shape of the peripheral diamond-shaped connecting rod combination in all the structural units satisfy the following condition: when the number of branches of the central scissor type connecting rod combination is n, the number of nodes is n +1, the number of peripheral diamond type connecting rod combinations is 2n, the shape of the peripheral diamond type connecting rod combination is determined by the angle of one internal angle of the peripheral diamond type connecting rod combination, and the size of the peripheral diamond type connecting rod combination is 2 pi/n.
8. The dual-rigidity intelligent structure of claim 1, wherein the structural units are arranged in a horizontal and vertical direction, and the distance between two adjacent units is the width and the height of the structural units.
CN201810181713.0A 2018-03-06 2018-03-06 Dual stiffness structure Expired - Fee Related CN108397684B (en)

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US5921048A (en) * 1996-04-18 1999-07-13 Brigham Young University Three-dimensional iso-tross structure
CN2888241Y (en) * 2006-02-19 2007-04-11 王跃 Wire with adjustable bending rigidity
CN205654768U (en) * 2016-03-25 2016-10-19 浙江师范大学 Composite beam that rigidity can be regulated and control based on magnetic current becomes effect
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