CN216519384U

CN216519384U - Ring sleeve type elastic metamaterial structure

Info

Publication number: CN216519384U
Application number: CN202123026695.5U
Authority: CN
Inventors: 李丽霞; 苏坤; 解妙霞; 李玲
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-05-13
Anticipated expiration: 2031-12-02

Abstract

The utility model discloses a ring sleeve type elastic metamaterial structure, wherein a bottom surface is arranged on one side of a solid ring structure, a plurality of layers of rings are periodically arranged on the bottom surface from inside to outside along the radius direction of the solid ring structure, a trunk part is arranged in the innermost ring, four wedge-shaped blocks are arranged at intervals on the outer side of each layer of rings, the trunk part is respectively connected with the wedge-shaped blocks on each layer of rings through four columnar structures to form a radial elastic structure, and the radial elastic structure extends outwards from the innermost ring and is connected with the side wall of the outermost ring to form the ring sleeve type elastic metamaterial structure. The utility model forms a partially hollow structure by connecting the radial elastic structure and the solid ring structure, and can provide excellent vibration damping characteristic in medium and low frequency environment.

Description

Ring sleeve type elastic metamaterial structure

Technical Field

The utility model belongs to the technical field of functional materials, and particularly relates to a ring sleeve type elastic metamaterial structure.

Background

The elastic metamaterial is a structure in which unit structures are periodically arranged, and is greatly concerned by scientific researchers because the elastic metamaterial can inhibit the transmission of elastic waves in a certain frequency range. In recent years, the concept and properties of elastic metamaterials have been applied in various fields.

When the device is used, various land traffic tracks such as buildings, bridges and railways can vibrate due to various reasons to influence the strength of the structure, and the vibration generated when various precision instruments work can also greatly influence the precision of the instruments. In view of the fact that the ideal effect of vibration control of the building industry and engineering machinery is not achieved at present, various buildings and mechanical equipment still can inevitably generate vibration of different degrees when applied, the elastic metamaterial is a periodic structure which is manually designed and has forbidden band characteristics, and the method for achieving vibration reduction and noise reduction by utilizing the forbidden band characteristics is a novel mode method.

Most of the existing elastic metamaterials are local resonance mechanisms, and can achieve the effect of controlling large wavelength in small size, but the band gap range provided by the existing elastic metamaterial structure at low and medium frequency is narrow, the effect of low-frequency shock absorption is very limited, and the strength of the structure cannot achieve an ideal effect.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the present invention is to provide an annular elastic metamaterial structure, which can have an ultra-wide band gap in a low frequency range and generate an excellent vibration damping effect, in view of the above-mentioned deficiencies in the prior art.

The utility model adopts the following technical scheme:

the utility model provides a ring cover formula elasticity metamaterial structure, including solid ring structure, one side of solid ring structure is provided with the bottom surface, the radial direction along solid ring structure on the bottom surface is provided with the multilayer ring from inside to outside periodic arrangement, be provided with the trunk portion in the ring of the innermost side, the equal interval in outside of each layer ring is provided with the wedge, the trunk portion is connected with the wedge on each layer ring respectively through columnar structure and is constituted radial elastic construction, radial elastic construction is outwards extended by the ring of inlayer, and be connected with the lateral wall of outmost ring and form ring cover formula elasticity metamaterial structure.

Specifically, the wedge blocks of each layer of rings are uniformly distributed along the circumferential direction, the central angle of each wedge block is 60 degrees, and the included angle between every two adjacent wedge blocks is 90 degrees.

Specifically, the outer diameter of the outermost ring is 27-28 mm, the inner diameter of the innermost ring is 5-6 mm, the radial distance between adjacent rings is 9-10 mm, and the radial width of the rings is 2-3 mm.

Specifically, the axial height of each layer of ring is 27-28 mm, and the axial thickness of the bottom of the ring is 2-3 mm.

Specifically, the axial distance between the bottom surface of the solid circular ring structure and the radial elastic structure is 7-8 mm.

Specifically, the side wall of the solid circular ring structure is provided with through holes corresponding to the columnar structures, and the through holes on each circle of side wall are arranged along the same axis.

Furthermore, the cross section of the through hole is rectangular, and the cross section of the columnar structure is circular.

Specifically, the trunk portion has a cross-shaped structure.

Specifically, the upper surface of each wedge-shaped block arranged along the same axial direction is 8-9 m higher than the upper surface of the trunk part, and the contact side of the outermost wedge-shaped block and the outermost ring is a square block which is inwards sunken and is in a curved surface shape.

Specifically, the axial thickness of the trunk part is 3-4 mm, and the axial height of the wedge-shaped block is 8-9 mm.

Compared with the prior art, the utility model has at least the following beneficial effects:

according to the annular sleeve type elastic metamaterial structure, the radial elastic structure and the solid annular structure are connected to form a partially hollow structure, excellent vibration reduction characteristics can be provided in a medium-low frequency environment, compared with the existing metamaterial disc structure, the band gap characteristic provided by the utility model is lower in frequency and wider in band gap, the band gap characteristics are optimized by modifying the structural parameters of the solid annular structure and the radial elastic structure, and the annular sleeve type elastic metamaterial structure has potential application value in engineering machinery and building industries.

Furthermore, four wedge blocks of each layer of rings are uniformly distributed along the circumferential direction, the central angle of each wedge block is 60 degrees, the included angle between every two adjacent wedge blocks is 90 degrees, the uniform stress is kept, and the structural strength is improved.

Further, the outer diameter of the outermost ring is 27-28 mm, the inner diameter of the innermost ring is 5-6 mm, the radial distance between adjacent rings is 9-10 mm, the radial width of the rings is 2-3 mm, the number of vibrators is increased, and the vibrators are prevented from being in contact with each other while vibrating.

Furthermore, the axial height of each layer of ring is 27-28 mm, the axial thickness of the bottom of each layer of ring is 2-3 mm, and the stability of the structure in the axial direction is guaranteed.

Furthermore, the axial distance between the bottom surface of the solid circular ring structure and the radial elastic structure is 7-8 mm, so that the structure is lightened as much as possible.

Furthermore, through holes are formed in the side wall of the solid circular ring structure corresponding to the columnar structure, and the through holes in each circle of side wall are arranged along the same axis, so that the structure can generate multi-stage resonance, and the band gap is increased.

Furthermore, the section of the through hole is rectangular with the size of 5mm multiplied by 3mm, a good supporting surface is provided, the section of the columnar structure is circular, the radial stress is uniform, and excessive shearing force cannot be generated.

Furthermore, the trunk part is of a cross-shaped structure, the total length of the outward extension is 32-33 mm, and the structure is integrally connected in series to achieve the effect of multi-stage resonance.

Furthermore, the upper surface of each wedge-shaped block arranged along the same axial direction is 8-9 m higher than the upper surface of the trunk part, the contact side of the outermost wedge-shaped block and the outermost ring is a square block which is inwards sunken and takes a curved surface shape, and the distance between the two side surfaces of the square block is 15-16 mm, so that the periodic arrangement of the structure is as small as possible to generate redundant stress.

Furthermore, the axial thickness of the trunk part is 3-4 mm, the axial height of the wedge-shaped block is 8-9 mm or 13mm, the stability of the structure is enhanced, and overlarge influence on the structure can not be generated when the overturning moment is generated.

In summary, the radial elastic structure and the solid ring structure are connected to form a partially hollow structure, so that the vibration damping device can provide excellent vibration damping characteristics in a medium-low frequency environment.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic structural diagram of a loop-type elastic metamaterial unit cell according to the present invention, wherein (a) is an installation structure diagram and (b) is a disassembly structure diagram;

FIG. 2 is a schematic view of the scattering structure of the loop type elastic metamaterial unit cell of the present invention;

FIG. 3 is a schematic diagram of a solid ring structure with a bottom of a ring-shaped elastic metamaterial unit cell according to the present invention;

FIG. 4 is a structural diagram of a loop type elastic metamaterial according to the present invention;

FIG. 5 is a graph of the energy band curve of the loop type elastic metamaterial according to the present invention;

FIG. 6 is a frequency response function graph of the loop type elastic metamaterial according to the present invention.

Wherein: 1. a radial elastic structure; 2. a solid ring structure; 3. a first wedge block; 4. a third wedge; a second ring; 6. a second wedge block; 7. a first circular ring; 8. a through hole; 9. a third circular ring; 10. a trunk portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Various structural schematics according to the disclosed embodiments of the utility model are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

The utility model provides a ring sleeve type elastic metamaterial structure which comprises a plurality of circular rings, wherein the circular rings are periodically arranged from inside to outside in the radius direction, and gaps between every two adjacent circular rings are connected through four wedge-shaped blocks. Four wedges of each circle are uniformly distributed in the circumferential direction, the central angle of each wedge is 60 degrees, the included angle between every two adjacent wedges is 90 degrees, 4 solid round cake-shaped elastic materials at the center of the ring-sleeve type elastic metamaterial structure extend out along the radial direction, the cross sections of the solid round cake-shaped elastic materials are cylindrical structures, the cylindrical structures penetrate through the centers of the corresponding wedges and are integrated with the wedges, and the wedge block at the outermost layer is tightly attached to the outer wall of the ring at the outermost layer.

Referring to fig. 1, the annular elastic metamaterial structure of the present invention includes a radial elastic structure 1 and a solid annular structure 2, wherein the solid annular structure 2 is connected to the radial elastic structure 1, and a hollow structure is formed therebetween; the radial elastic structure 1 extends outwards through a through hole 8 on the side wall of the solid circular ring structure 2 to form assembly with the side wall of the solid circular ring structure 2.

The side wall of the solid ring structure 2 is arranged along the radial direction and sequentially comprises a first ring 7, a second ring 5 and a third ring 9 from inside to outside, the radial elastic structure 1 comprises a main part 10, first wedge blocks 3, second wedge blocks 6 and third wedge blocks 4, the main part 10 is arranged inside the first ring 7, four third wedge blocks 4 are arranged between the first ring 7 and the second ring 5 at intervals, four second wedge blocks 6 are arranged between the second ring 5 and the third ring 9 corresponding to the third wedge blocks 4 at intervals, four first wedge blocks 3 are arranged outside the third ring 9 corresponding to the second wedge blocks 6 at intervals, the third wedge blocks 4, the second wedge blocks 6 and the first wedge blocks 3 are arranged into four groups corresponding to the main part, each group of the third wedge blocks 4, the second wedge blocks 6 and the first wedge blocks 3 are arranged along the same axis, and the main part 10 and the four groups of the third wedge blocks 4, the second wedge blocks 6 and the first wedge blocks 3 are arranged along the same axis line, The second wedge-shaped block 6 and the first wedge-shaped block 3 are connected through a columnar structure with a circular cross section.

Referring to fig. 3, the solid ring structure 2 with a bottom has three layers of side walls arranged in the radial direction, the side wall surfaces of the first ring 7, the second ring 5 and the third ring 9 all include four circular through holes 8, the interval angle between adjacent through holes 8 is 90 °, the through holes of the three layers of side walls are arranged along the same axis, one end of the columnar structure is connected with the main portion 10, and the other end of the columnar structure sequentially penetrates through the through holes 8 on the first ring 7, the second ring 5 and the third ring 9 to be connected with the corresponding first wedge-shaped block 3, the second wedge-shaped block 6 and the third wedge-shaped block 4 to form an integrated structure.

The outer diameter of the third ring 9 at the outermost ring is 27-28 mm, the inner diameter of the first ring 7 at the innermost ring is 5-6 mm, the radial distance between adjacent solid rings is 9-10 mm, the radial width of each solid ring is 2-3 mm, the axial height of the second ring 5, the axial height of the first ring 7 and the axial height of the third ring 9 are 27-28 mm, the axial thickness of the bottom of the second ring is 2-3 mm, and the cross section of each through hole 8 is a rectangle of 5mm multiplied by 3 mm.

The bottom thickness of the solid circular ring structure 2 is 2mm, and the axial distance between the radial elastic structure 1 and the bottom of the solid circular ring structure 2 is 7-8 mm.

Referring to fig. 2, a trunk portion 10 of the radial elastic structure 1 is a cross-shaped structure, extends from inside to outside, and is respectively connected with a group of third wedge blocks 3, second wedge blocks 6 and first wedge blocks 4, the total length of the outward extension is 32-33 mm, the third wedge blocks 3, the second wedge blocks 6 and the first wedge blocks 4 surround a circle with the same radius, and the radial positions of the wedge blocks arranged along the same axis are the same.

The axial thickness of the trunk part 10 is 3mm, the axial heights of the third wedge-shaped block 3, the second wedge-shaped block 6 and the first wedge-shaped block 4 are 8-9 mm, and the axial distance between the trunk part 10 and the bottoms of the second ring 5, the first ring 7 and the third ring 9 is 7.5 mm;

the axial height of third wedge 3, second wedge 6 and first wedge 4 is 8 ~ 9mm, and the central angle of the first wedge 4 of inlayer is 60, along axial direction, the upper surface of wedge is 8 ~ 9m than the upper surface height of trunk portion 10, and outmost first wedge 3 is the square piece that one side is the curved surface formula indent, and its both sides face distance is 15 ~ 16 mm.

The inner side surfaces of the first wedge-shaped block 3, the second wedge-shaped block 4 and the third wedge-shaped block 6 are equal to the outer side surfaces of the third ring 9, the second ring 5 and the first ring 7 which are in contact with the inner side surfaces of the first wedge-shaped block and the second wedge-shaped block, and the radial radius of the outer wall surface of the first ring 7 is equal to that of the outer wall surface of the first wedge-shaped block 3 on the outermost layer.

Referring to fig. 4, a plurality of annular elastic metamaterial structures are arranged in an array, which shows a periodic combination manner of a single structure as a unit.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to ensure that the structure has certain rigidity and strength, the whole structure of the solid ring structure 2 with the bottom arranged from inside to outside along the radius is made of 45 steel, the structure 1 radially extending from the center to the outside is made of rubber, and specific material parameters are shown in table 1.

TABLE 1 Material parameters

Material	Young's modulus	Density of	Poisson ratio
				45 steel	2.1e11pa	7875kg·m³	0.33
Rubber composition	1.175e5pa	1300kg·m³	0.47

Referring to fig. 5 and 6, the vibration has a very significant vibration attenuation between 40 to 251Hz and 260 to 355Hz, and the vibration attenuation has already reached-300 db, and comparing with the energy band curve diagram of the structure shown in fig. 5, it can be seen that two band gaps exist in the structure in the range of 40 to 355Hz, the band gap effect is better in the low frequency range of 40 to 250Hz, and the structure completely suppresses the vibration caused by the elastic wave in this range.

The two-dimensional annular sleeve type radial elastic metamaterial structure can generate a band gap of medium and low frequency, and effectively inhibits elastic waves.

In summary, the present invention provides an annular elastic metamaterial structure having a smaller size and a lighter structure than a conventional two-dimensional photonic crystal structure under the condition of controlling elastic waves in the same frequency range. The control of the medium-frequency and low-frequency elastic waves can greatly reduce the vibration of engineering machinery and precision instruments, and has great application value in the manufacturing industry and the building industry.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims

1. The utility model provides a loop formula elasticity metamaterial structure, a serial communication port, including solid ring structure (2), one side of solid ring structure (2) is provided with the bottom surface, the radial direction along solid ring structure (2) is provided with the multilayer ring from inside to outside periodic arrangement on the bottom surface, be provided with trunk portion (10) in the most inboard ring, the outside of each layer of ring all is provided with the wedge at the interval, trunk portion (10) are connected with the wedge on each layer of ring respectively through columnar structure and are constituted radial elastic construction (1), radial elastic construction (1) are outwards extended by the ring of inlayer to be connected with the lateral wall of outermost ring and form loop formula elasticity metamaterial structure.

2. The endless loop type elastic metamaterial structure of claim 1, wherein the wedge blocks of each layer of rings are uniformly distributed along the circumferential direction, the center angle of each wedge block is 60 °, and the included angle between adjacent wedge blocks is 90 °.

3. The annular sleeve type elastic metamaterial structure of claim 1, wherein the outer diameter of the outermost rings is 27-28 mm, the inner diameter of the innermost rings is 5-6 mm, the radial distance between adjacent rings is 9-10 mm, and the radial width of the rings is 2-3 mm.

4. The annular sleeve type elastic metamaterial structure of claim 1, wherein the axial height of each layer of rings is 27-28 mm, and the axial thickness of the bottom of each layer of rings is 2-3 mm.

5. The annular sleeve type elastic metamaterial structure according to claim 1, wherein the axial distance between the bottom surface of the solid circular structure (2) and the radial elastic structure (1) is 7-8 mm.

6. Ring sleeve type elastic metamaterial structure according to claim 1, wherein the side walls of the solid ring structure (2) are provided with through holes (8) corresponding to the columnar structures, and the through holes (8) on each ring of side walls are arranged along the same axis.

7. Ring sleeve elastic metamaterial structure in accordance with claim 6, wherein the cross-section of the through-hole (8) is rectangular and the cross-section of the columnar structure is circular.

8. Ring sleeve elastic metamaterial structure according to claim 1, wherein the trunk portion (10) is a cross-shaped structure.

9. The ring-sleeve elastic metamaterial structure according to claim 1, wherein the upper surface of each wedge-shaped block arranged in the same axial direction is 8 to 9m higher than the upper surface of the trunk portion (10), and the contact side of the outermost wedge-shaped block (3) and the outermost ring is a square block which is concave inwards and takes a curved shape.

10. The looped elastic metamaterial structure according to claim 1, wherein the trunk portion (10) has an axial thickness of 3 to 4mm and the wedge blocks have an axial height of 8 to 9 mm.