CN110861790B - Pure lattice force-bearing cylinder - Google Patents
Pure lattice force-bearing cylinder Download PDFInfo
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- CN110861790B CN110861790B CN201911053657.3A CN201911053657A CN110861790B CN 110861790 B CN110861790 B CN 110861790B CN 201911053657 A CN201911053657 A CN 201911053657A CN 110861790 B CN110861790 B CN 110861790B
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- cylindrical shell
- lattice
- ribs
- outer cylindrical
- inner cylindrical
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- 238000003491 array Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 11
- 239000002356 single layer Substances 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000007777 multifunctional material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/66—Arrangements or adaptations of apparatus or instruments, not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a pure lattice force-bearing cylinder, which comprises an outer cylindrical shell, a lattice sandwich and an inner cylindrical shell which are sequentially arranged from outside to inside, wherein the outer cylindrical shell and the inner cylindrical shell are both formed by a two-dimensional lattice structure formed by crossing longitudinal ribs and oblique ribs; the lattice sandwich is arranged between the outer cylindrical shell and the inner cylindrical shell and is composed of a plurality of three-dimensional cell arrays. The invention is suitable for the design of the main bearing structure of the multifunctional aircraft under the load conditions of bearing axle pressure, bending, shearing and the like.
Description
Technical Field
The invention relates to the field of main bearing structure design of spacecrafts, in particular to a pure lattice bearing cylinder.
Background
In recent years, along with the continuous development and perfection of the preparation process, the light dot matrix structure has the characteristics of light weight and multifunction, and the dot matrix structure is a new generation of light super-strong toughness material which is currently and internationally considered as the most promising, and has high specific stiffness and specific strength, good designability and multifunctionality, and is widely focused in a plurality of fields. In order to achieve the goals of weight saving and payload increasing of an aerospace vehicle, it is therefore highly desirable to apply lattice structures to the main load-carrying structure of the aerospace vehicle.
Disclosure of Invention
The invention aims to provide a pure lattice force-bearing cylinder which comprises an outer cylindrical shell, a lattice sandwich and an inner cylindrical shell which are sequentially arranged from outside to inside, wherein the outer cylindrical shell and the inner cylindrical shell are both formed by a two-dimensional lattice structure formed by crossing longitudinal ribs and oblique ribs;
the lattice sandwich is arranged between the outer cylindrical shell and the inner cylindrical shell and is composed of a plurality of three-dimensional cell arrays.
Preferably, the outer cylindrical shell and the inner cylindrical shell are both in a triangular lattice configuration or a quadrilateral lattice configuration.
Preferably, the section of the longitudinal ribs of the outer cylindrical shell is quadrilateral or circular;
the section of the oblique rib of the outer cylindrical shell is quadrilateral or circular;
the section of the longitudinal rib of the inner cylindrical shell is quadrilateral or circular;
the cross section of the oblique rib of the inner cylindrical shell is quadrilateral or circular.
Preferably, the longitudinal ribs and the oblique ribs of the outer cylindrical shell have the same radial thickness;
the longitudinal ribs and the oblique ribs of the inner cylindrical shell have the same radial thickness;
the width and the thickness of the longitudinal ribs of the outer cylindrical shell are respectively the same as those of the longitudinal ribs of the inner cylindrical shell;
the width and the thickness of the oblique ribs of the outer layer cylindrical shell are respectively the same as those of the oblique ribs of the inner layer cylindrical shell.
Preferably, the cross-sectional area of the longitudinal ribs of the outer cylindrical shell is larger than the cross-sectional area of the oblique ribs;
the cross-sectional area of the longitudinal ribs of the inner cylindrical shell is larger than that of the oblique ribs.
Preferably, the intersection point of the longitudinal rib and the oblique rib of the outer cylindrical shell is fixedly connected with the outermost top point of the cell of the lattice sandwich, and the intersection point of the longitudinal rib and the oblique rib of the inner cylindrical shell is fixedly connected with the innermost top point of the cell of the lattice sandwich.
Preferably, the cells of the lattice sandwich are tetrahedral or pyramid-shaped.
Preferably, the cells of the lattice sandwich are composed of a plurality of rod pieces, and the section of each rod piece is quadrilateral or circular.
Preferably, the cells of the lattice sandwich are single-layer or multi-layer.
Preferably, the device further comprises two annular end frames, wherein the top and the bottom of the outer cylindrical shell, the lattice sandwich and the inner cylindrical shell are integrally formed with the upper end frame and the lower end frame through an additive manufacturing process respectively.
Preferably, the end frame is made of a U-shaped plate.
Preferably, a plurality of bolt connecting holes are formed in the end frames and are used for being connected with the end frames of the adjacent bearing cylinders through bolt fasteners.
Preferably, the outer cylindrical shell, the inner cylindrical shell, the lattice sandwich and the end frame are all made of metal materials.
Compared with the prior art, the invention has the following technical effects:
the lattice structure is a new generation of advanced light super-tough multifunctional material which is currently and internationally considered to be the most promising, and the light lattice material has extremely strong buckling resistance, so that the lattice structure is suitable for the main bearing structure design of the multifunctional aircraft under the load conditions of bearing axial compression, bending, shearing and the like. Compared with the traditional closed skin honeycomb or honeycomb sandwich cylindrical shell structure, the cylindrical shell structure has the advantages that the inner cylindrical shell and the outer cylindrical shell are both open, and the thinner large-size structure can be adopted to avoid buckling instability of the skin, so that the structure weight is reduced under the condition of optimizing the bearing capacity, the space for optimizing the structure is effectively increased, the structure is convenient to install and maintain compared with the traditional structure, and the defect sensitivity of the structure is greatly reduced.
The lattice structure can limit defect damage in local cells while realizing light weight design, fine design and multifunctional design, and has the function of preventing damage from further expanding, so that the pure lattice force-bearing cylinder structure has higher specific strength and specific rigidity performance, can effectively inhibit defect expansion, reduces structural defect sensitivity and improves structural bearing capacity.
The inner and outer cylindrical shells mainly bear the axial tension and compression effect, and the structure has high self-stability and strong buckling resistance; the open space configuration of the lattice structure enables the structure to be designed in a multifunctional way, such as filling wave-absorbing foam to form a stealth structure interlayer and the like; the spatial open configuration of the structure also facilitates inspection and repair.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the accompanying drawings:
FIG. 1 is a top view of a pure lattice load cylinder (without end frame) according to a preferred embodiment of the present invention;
FIG. 2 is a perspective view of a pure lattice load bearing cylinder according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of the structure of an outer cylindrical shell according to a preferred embodiment of the present invention;
FIG. 4 is a schematic view of the structure of an inner cylindrical shell according to the preferred embodiment of the present invention;
FIG. 5 is a top view of a single layer pyramid-type lattice sandwich provided by a preferred embodiment of the present invention;
FIG. 6 is a perspective view of a single layer pyramid-type lattice sandwich provided by a preferred embodiment of the present invention;
FIG. 7 is a top view of a pure lattice load cylinder (without end frames and with single-layer pyramid-shaped lattice sandwich) according to a preferred embodiment of the present invention;
FIG. 8 is a top view of a two-layer pyramid-type lattice sandwich provided by a preferred embodiment of the present invention;
FIG. 9 is a perspective view of a two-layer pyramid-type lattice sandwich provided by a preferred embodiment of the present invention;
fig. 10 is a schematic structural view of upper and lower end frames according to a preferred embodiment of the present invention.
Detailed Description
The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are provided, but the protection scope of the present invention is not limited to the following embodiments, and those skilled in the art can modify and moisten the present invention without changing the spirit and content of the present invention.
Referring to fig. 1 to 10, a pure lattice force-bearing cylinder comprises an outer cylindrical shell 1, a lattice sandwich 3 and an inner cylindrical shell 2 which are sequentially arranged from outside to inside, wherein the outer cylindrical shell 1 and the inner cylindrical shell 2 are both formed by two-dimensional lattice structures crossed by longitudinal ribs and oblique ribs; the lattice sandwich 3 is arranged between the outer cylindrical shell 1 and the inner cylindrical shell 2 and is formed by a plurality of three-dimensional cell arrays. Specific:
the outer cylindrical shell 1 is of a lattice structure and comprises a plurality of longitudinal ribs 11 and oblique ribs 12, and the longitudinal ribs 11 and the oblique ribs 12 are crossed; in this embodiment, a plurality of longitudinal ribs 11 are arranged at intervals and enclose a circle, and a plurality of oblique ribs 12 are inclined and curved in a circular arc shape to intersect with the longitudinal ribs 11. The outer cylindrical shell 1 is unfolded into a two-dimensional lattice panel, namely, in the unfolded state of the outer cylindrical shell 1, the crossed longitudinal ribs 11 and the crossed oblique ribs 12 are positioned on the same plane, and the outer cylindrical shell 1 is formed by bending the two-dimensional lattice panel. The inclination angle and the inclination direction of the diagonal rib 12 are not limited in the invention, and can be determined according to specific requirements.
The inner cylindrical shell 2 lattice structure comprises a plurality of crossed longitudinal ribs 21 and oblique ribs 22, wherein the longitudinal ribs 21 and the oblique ribs 22 are crossed; in this embodiment, a plurality of longitudinal ribs 21 are arranged at intervals and enclose a circle, and a plurality of diagonal ribs 22 are inclined and curved in a circular arc shape to intersect with the longitudinal ribs 21. The inner cylindrical shell 2 is unfolded into a two-dimensional lattice panel, namely, in the unfolded state of the inner cylindrical shell 2, the crossed longitudinal ribs 21 and the crossed oblique ribs 22 are positioned on the same plane, and the inner cylindrical shell 2 is formed by bending the two-dimensional lattice panel. The inclination angle and the inclination direction of the diagonal rib 22 are not limited in the invention, and can be determined according to specific requirements.
In this embodiment, the outer cylindrical shell 1 and the inner cylindrical shell 2 are on the same axis.
In this embodiment, the points of intersection between the longitudinal ribs 11 and the oblique ribs 12 of the outer cylindrical shell 1 are fixedly connected with the top points of the outermost sides (the side closest to the outer cylindrical shell 1 is the outermost side) of the cells of the lattice sandwich 3, so as to form a complete structural body; the crossing points of the longitudinal ribs 21 and the oblique ribs 22 of the inner cylindrical shell 2 are fixedly connected with the innermost vertexes (the side closest to the inner cylindrical shell 2 is the innermost side) of the cells of the lattice sandwich 3, so that a complete structure body is formed. The top and the bottom of the outer cylindrical shell 1, the lattice sandwich 3 and the inner cylindrical shell 2 are integrally formed with the upper end frame 4 and the lower end frame 4 respectively through an additive manufacturing process.
In this embodiment, the plurality of longitudinal ribs 11 of the outer cylindrical shell 1 are uniformly spaced, the plurality of diagonal ribs 12 are uniformly spaced, and the minimum closed pattern formed by intersecting the longitudinal ribs 11 and the diagonal ribs 12 is triangle or quadrangle, that is, the outer cylindrical shell 1 is triangle lattice configuration or quadrangle lattice configuration;
in this embodiment, the plurality of longitudinal ribs 21 of the inner cylindrical shell 2 are uniformly spaced, the plurality of diagonal ribs 22 are uniformly spaced, and the minimum closed pattern formed by intersecting the longitudinal ribs 21 and the diagonal ribs 22 is a triangle or a quadrilateral, i.e. the inner cylindrical shell 2 is in a triangle lattice configuration or a quadrilateral lattice configuration.
The present invention is not limited to the specific shape and size of the longitudinal ribs and diagonal ribs of the outer cylindrical shell 1 and the inner cylindrical shell 2, and preferably:
the cross section of the longitudinal ribs 11 of the outer cylindrical shell 1 is quadrilateral or circular, the cross section of the oblique ribs 12 of the outer cylindrical shell 1 is quadrilateral or circular, and the cross section shapes of the longitudinal ribs 11 and the oblique ribs 12 can be the same or different; the longitudinal ribs 11 have a larger cross-sectional area than the diagonal ribs 12.
The cross section of the longitudinal ribs 21 of the inner cylindrical shell 2 is quadrilateral or circular, the cross section of the oblique ribs 22 is quadrilateral or circular, and the cross section shapes of the longitudinal ribs 21 and the oblique ribs 22 can be the same or different; the longitudinal ribs 21 have a cross-sectional area greater than the cross-sectional area of the diagonal ribs 22.
The radial thickness of the longitudinal ribs 11 and the radial thickness of the oblique ribs 12 of the outer cylindrical shell 1 are the same;
the radial thickness of the longitudinal ribs 21 and the radial thickness of the oblique ribs 22 of the inner cylindrical shell 2 are the same;
the width and thickness of the longitudinal ribs 11 of the outer cylindrical shell 1 are respectively the same as the width and thickness of the longitudinal ribs 21 of the inner cylindrical shell 2;
the width and thickness of the oblique ribs 12 of the outer cylindrical shell 1 are respectively the same as those of the oblique ribs 22 of the inner cylindrical shell 2.
As an example, the sections of the longitudinal ribs 11 and the oblique ribs 12 of the outer cylindrical shell 1 are quadrangular, the radial thicknesses of the longitudinal ribs 11 and the oblique ribs 12 are the same, and the longitudinal ribs 11 are 2 to 3 times the section width of the oblique ribs 12.
The sections of the longitudinal ribs 21 and the oblique ribs 22 of the inner cylindrical shell 2 are quadrilateral, the radial thicknesses of the longitudinal ribs 21 and the oblique ribs 22 are the same, and the longitudinal ribs 21 are 2 to 3 times of the section width of the oblique ribs 22.
In this embodiment, the lattice sandwich 3 is a cylindrical shell structure formed by longitudinally and circumferentially arrayed cells, and the cells are tetrahedral or pyramid-shaped.
Specifically, the cell is composed of a plurality of rods, and the section of each rod is quadrilateral or circular. The present invention does not limit the size of the rods, and in this embodiment, all rods in each cell have the same size and a slenderness ratio of 5-10. And the cross-sectional dimensions of all the rods within each cell are the same.
The cell of the lattice sandwich is a single layer or multiple layers, as shown in fig. 5 to 7, the cell is a single layer, and the lattice sandwich 3 is a single-layer pyramid-type lattice sandwich 3 structure; as shown in fig. 8 and 9, the cell has two layers, and the lattice sandwich 3 has a two-layer pyramid-type lattice sandwich structure. Preferably, the cells take 2 to 3 layers.
In this embodiment, the end bells 4 are made of U-shaped plates. The free nodes of the outer cylindrical shell 1, the lattice sandwich 3 and the inner cylindrical shell 2 are connected together through a closed U-shaped thick plate end frame 4. The end frame 4 is provided with a plurality of bolt connecting holes 41 for fastening and connecting with the end frame 4 of the adjacent bearing cylinder through bolt fasteners.
In this embodiment, the outer cylindrical shell 1, the inner cylindrical shell 2, the lattice sandwich 3 and the end frame 4 are all made of metal materials, and the lattice structure is a new generation of advanced light super-tough multifunctional material which is currently considered to be the most promising internationally, and the light lattice material has extremely strong buckling resistance.
The above disclosure is only one specific embodiment of the present application, but the present application is not limited thereto, and any changes that can be thought by those skilled in the art should fall within the protection scope of the present application.
Claims (13)
1. The pure lattice force-bearing cylinder is characterized by comprising an outer cylindrical shell, a lattice sandwich and an inner cylindrical shell which are sequentially arranged from outside to inside, wherein the outer cylindrical shell and the inner cylindrical shell are both formed by a two-dimensional lattice structure with longitudinal ribs and oblique ribs which are crossed;
the lattice sandwich is arranged between the outer cylindrical shell and the inner cylindrical shell and is composed of a plurality of three-dimensional cell arrays.
2. The pure lattice load bearing cylinder of claim 1, wherein the outer cylindrical shell and the inner cylindrical shell are both in a triangular lattice configuration or a quadrilateral lattice configuration.
3. The pure lattice force-bearing cylinder as claimed in claim 1, wherein the longitudinal ribs of the outer cylindrical shell are quadrilateral or circular in cross section;
the section of the oblique rib of the outer cylindrical shell is quadrilateral or circular;
the section of the longitudinal rib of the inner cylindrical shell is quadrilateral or circular;
the cross section of the oblique rib of the inner cylindrical shell is quadrilateral or circular.
4. The pure lattice load-bearing cylinder according to claim 1, wherein the longitudinal ribs and the oblique ribs of the outer cylindrical shell have the same radial thickness;
the longitudinal ribs and the oblique ribs of the inner cylindrical shell have the same radial thickness;
the width and the thickness of the longitudinal ribs of the outer cylindrical shell are respectively the same as those of the longitudinal ribs of the inner cylindrical shell;
the width and the thickness of the oblique ribs of the outer layer cylindrical shell are respectively the same as those of the oblique ribs of the inner layer cylindrical shell.
5. The pure lattice load-bearing cylinder of claim 1, wherein the cross-sectional area of the longitudinal ribs of the outer cylindrical shell is greater than the cross-sectional area of the diagonal ribs;
the cross-sectional area of the longitudinal ribs of the inner cylindrical shell is larger than that of the oblique ribs.
6. The pure lattice force-bearing cylinder as claimed in claim 1, wherein the intersection point of the longitudinal ribs and the oblique ribs of the outer cylindrical shell is fixedly connected with the outermost top point of the cells of the lattice sandwich, and the intersection point of the longitudinal ribs and the oblique ribs of the inner cylindrical shell is fixedly connected with the innermost top point of the cells of the lattice sandwich.
7. The pure lattice load-bearing cylinder of claim 1, wherein the lattice sandwich cells are tetrahedral or pyramidal.
8. The pure lattice force-bearing cylinder of claim 1, wherein the lattice sandwich cell is composed of a plurality of rods, and the cross section of each rod is quadrilateral or circular.
9. The pure lattice load-bearing cylinder of claim 1, wherein the lattice sandwich cells are single-layer or multi-layer.
10. The pure lattice force-bearing cylinder of claim 1, further comprising two annular end frames, wherein the top and bottom of the outer cylindrical shell, the lattice sandwich and the inner cylindrical shell are integrally formed with the upper and lower end frames by additive manufacturing process, respectively.
11. A pure lattice load cylinder according to claim 10, wherein the end frame is made of U-shaped plates.
12. The pure lattice load bearing cylinder of claim 10, wherein the end frames are provided with a plurality of bolt connecting holes for connecting with the end frames of the adjacent load bearing cylinders through bolt fasteners.
13. The pure lattice load-carrying cylinder of claim 1, wherein the outer cylindrical shell, the inner cylindrical shell, the lattice sandwich and the end frame are all made of metal materials.
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| CN201911053657.3A CN110861790B (en) | 2019-10-31 | 2019-10-31 | Pure lattice force-bearing cylinder |
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| CN201911053657.3A CN110861790B (en) | 2019-10-31 | 2019-10-31 | Pure lattice force-bearing cylinder |
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| CN110861790B true CN110861790B (en) | 2024-02-06 |
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| CN113858717B (en) * | 2021-08-30 | 2023-02-28 | 北华航天工业学院 | Composite material lattice sandwich cylindrical bearing structure |
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| EP2607058A1 (en) * | 2011-12-20 | 2013-06-26 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Rotationally symmetrical structural element in grid construction and method for its production |
| CN104015407A (en) * | 2014-05-13 | 2014-09-03 | 清华大学 | Composite lattice structure with curved surface and preparation method thereof |
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| CN108298109A (en) * | 2018-01-05 | 2018-07-20 | 南京航空航天大学 | A kind of multistage grid reinforcement barrel shell structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100075074A1 (en) * | 2008-08-15 | 2010-03-25 | Wilson Erich A | Collapsible Mandrel Tools and Associated Methods for Fabrication of Wound Composite Articles |
| US20100323181A1 (en) * | 2009-06-23 | 2010-12-23 | Nutt Steven R | Rigid carbon fiber cores for sandwich composite structures |
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2019
- 2019-10-31 CN CN201911053657.3A patent/CN110861790B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303427A (en) * | 2011-07-12 | 2012-01-04 | 北京航空航天大学 | Dual-interlayer symmetrical multi-pyramid configuration three-dimensional integrally-braid lattice composite material and preparation method thereof |
| EP2607058A1 (en) * | 2011-12-20 | 2013-06-26 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Rotationally symmetrical structural element in grid construction and method for its production |
| CN104015407A (en) * | 2014-05-13 | 2014-09-03 | 清华大学 | Composite lattice structure with curved surface and preparation method thereof |
| CN104608915A (en) * | 2015-01-30 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Multilayer grating bearing cylinder and preparation method thereof |
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