An umbrella-shaped elastic metamaterial structure with broadband vibration reduction properties

Abstract

The present invention discloses an umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics, comprising an umbrella cap, an elastic annular structure and an umbrella column; the umbrella cap and the umbrella column are connected by the elastic annular structure, and a cavity is formed between the umbrella cap and the umbrella column. The umbrella-shaped elastic metamaterial structure provided by the embodiment of the present invention has excellent vibration band gap characteristics and can effectively reduce the influence of low-frequency micro-vibration on precision instruments and equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration reduction, and in particular relates to an umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics. Background Art

[0002] The vibration caused by construction will interfere with the normal use of precision instruments and high-precision equipment in adjacent areas, affecting the normal development of scientific research and industrial work. At present, the rating and research on the level of vibration and noise caused by construction is not comprehensive enough, and the impact of vibration with a larger frequency range on precision instruments and equipment is even less studied, and there is no efficient vibration reduction device to reduce low-frequency micro-vibration. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics and excellent vibration bandgap characteristics.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] An umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics comprises an umbrella cap, an elastic annular structure and an umbrella column; the umbrella cap and the umbrella column are connected by the elastic annular structure, and a cavity is formed between the umbrella cap and the umbrella column.

[0006] Furthermore, the umbrella cap, the elastic annular structure and the umbrella column are made of different materials.

[0007] Furthermore, the umbrella cap is made of epoxy resin material; the elastic annular structure is made of rubber material; and the umbrella column is made of steel material.

[0008] Furthermore, the shape of the umbrella cap is: a first hemispherical shell with the top portion cut off, the height of the top portion of the first hemispherical shell cut off is less than the difference between the inner diameter and the outer diameter of the first hemispherical shell; the plane formed after the top portion of the first hemispherical shell is cut off is parallel to the hemispherical surface of the first hemispherical shell.

[0009] Furthermore, the elastic annular structure has a shape of: a second hemispherical shell with a top portion cut off, the top portion of the second hemispherical shell is cut off to form a ring, and the bottom surface of the cut-off top portion of the second hemispherical shell is parallel to the hemispherical surface of the second hemispherical shell.

[0010] Furthermore, the umbrella column includes a solid hemisphere and a cylinder, the hemispherical surface of the solid hemisphere is connected to the top of the cylinder, and the top surface of the cylinder has the same area as the hemispherical surface of the solid hemisphere.

[0011] Furthermore, the inner hemispherical shell diameter of the first hemispherical shell matches the outer hemispherical shell diameter of the second hemispherical shell; the inner hemispherical shell diameter of the second hemispherical shell matches the diameter of the solid hemispherical body; the inner ring of the elastic annular structure is connected to the solid hemispherical body, and the inner wall of the umbrella cap is connected to the outer ring of the elastic annular structure.

[0012] Furthermore, the inner hemispherical shell diameter of the first hemispherical shell is 16 mm, the outer hemispherical shell diameter is 20 mm, and the distance between the top surface and the bottom surface of the hemispherical shell is 9 mm; the inner ring diameter of the elastic circular ring structure is 14 mm, the outer ring diameter is 16 mm, and the height is 2 mm; the diameter of the solid hemispherical body is 14 mm.

[0013] Furthermore, the height of the elastic annular structure is smaller than the height of the umbrella cap and the height of the solid hemisphere.

[0014] Furthermore, the umbrella-shaped elastic metamaterial structure is axially symmetrical along the axis of the umbrella column.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The umbrella-shaped elastic metamaterial structure provided in the embodiment of the present invention has excellent vibration bandgap characteristics, and the formed cavity to a certain extent can effectively reduce the impact of low-frequency micro-vibration on precision instruments and equipment compared with other solid phononic crystal structures.

[0017] 2. The umbrella-shaped elastic metamaterial structure provided in the embodiment of the present invention adopts different materials. The umbrella-shaped elastic metamaterial structure provided in the embodiment of the present invention has good processing and manufacturing advantages and greatly reduces the manufacturing cost.

[0018] 3. The umbrella-shaped elastic metamaterial structure provided by the embodiment of the present invention is lighter than the traditional vibration isolation structure of the same size and has an adjustable band gap range for elastic waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 Schematic diagram of the structure of an umbrella-shaped elastic metamaterial structure according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the structural connection of the umbrella-shaped elastic metamaterial structure according to an embodiment of the present invention.

[0022] Figure 3 This is a cell array diagram of an umbrella-shaped elastic metamaterial structure according to an embodiment of the present invention.

[0023] Figure 4 It is a frequency function curve diagram of the umbrella-shaped elastic metamaterial structure according to an embodiment of the present invention.

[0024] Figure 5 It is a frequency response function curve diagram of the umbrella-shaped elastic metamaterial structure according to an embodiment of the present invention.

[0025] Among them: 1 umbrella cap; 2 elastic ring-shaped structure; 3 umbrella column; 31 solid hemisphere; 32 cylinder; 4 cavity. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0027] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit exemplary embodiments according to the present invention.

[0028] like Figure 1 and 2 As shown, an embodiment of the present invention provides an umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics, including an umbrella cap 1, an elastic annular structure 2 and an umbrella column 3; the height of the elastic annular structure 2 is less than the height of the umbrella cap 1 and the height of the solid hemisphere 31. The umbrella cap 1 and the umbrella column 3 are connected by the elastic annular structure 2, and a cavity 4 is formed between the umbrella cap 1 and the umbrella column 3, which effectively plays a role in controlling broadband vibration. The materials used to make the umbrella cap 1, the elastic annular structure 2 and the umbrella column 3 are all different; the umbrella cap 1 is made of epoxy resin material; the elastic annular structure 2 is made of rubber material; and the umbrella column 3 is made of steel material.

[0029] The shape of the umbrella cap 1 is: a first hemispherical shell with the top portion cut off, the height of the top portion of the first hemispherical shell cut off is less than the difference between the inner diameter and the outer diameter of the first hemispherical shell; the plane formed after the top portion of the first hemispherical shell is cut off is parallel to the hemispherical surface of the first hemispherical shell.

[0030] The elastic annular structure 2 is in the shape of a second hemispherical shell with its top portion cut off, the top portion of the second hemispherical shell being cut off to form a ring, and the bottom surface of the cut top portion of the second hemispherical shell being parallel to the hemispherical surface of the second hemispherical shell.

[0031] The umbrella column 3 includes a solid hemispherical body 31 and a cylindrical body 32 . The hemispherical surface of the solid hemispherical body 31 is connected to the top of the cylindrical body 32 . The top surface of the cylindrical body 32 has the same area as the hemispherical surface of the solid hemispherical body 31 .

[0032] The inner hemispherical shell diameter of the first hemispherical shell matches the outer hemispherical shell diameter of the second hemispherical shell; the inner hemispherical shell diameter of the second hemispherical shell matches the diameter of the solid hemispherical body 31; the inner ring of the elastic annular structure 2 is connected to the solid hemispherical body 31, and the inner wall of the umbrella cap 1 is connected to the outer ring of the elastic annular structure 2.

[0033] In a preferred embodiment of the present invention, the umbrella-shaped elastic metamaterial structure is axially symmetrical along the axis of the umbrella column 3 .

[0034] In a preferred embodiment of the present invention, the inner hemispherical shell diameter of the first hemispherical shell is 16 mm, the outer hemispherical shell diameter is 20 mm, the thickness of the first hemispherical shell is 2 mm, the distance between the cut top surface and the bottom surface of the hemispherical shell is 9 mm, and the height of the cut top portion of the first hemispherical shell is 1 mm. The height of the cut portion of the second hemispherical shell is 6 mm from its top, and the thickness of the second hemispherical shell is 1 mm. The inner ring diameter of the elastic annular structure 2 is 14 mm, the outer ring diameter is 16 mm, and the height is 2 mm. The diameter of the solid hemispherical body 31 is 14 mm, and the diameter of the cylinder 32 is 14 mm and the height is 11 mm.

[0035] like Figure 3 As shown, the arrangement of the unit cell structure is a one-dimensional arrangement. In this embodiment, a structure of 8 unit cells arranged in one dimension is adopted. In the embodiment of the present invention, epoxy resin is used as the material of the umbrella cap 1. The specific material parameters are: density ρ = 1180 kg / m 3 , shear modulus E = 4.35 × 109 Pa, Poisson's ratio μ = 0.368; The present invention uses silicone rubber as the material of the elastic annular structure 2, and the specific material parameters are: density ρ = 1300 kg / m 3 , shear modulus E = 1.175 × 105Pa, Poisson's ratio μ = 0.469; the present invention uses steel as the material of the umbrella column 3, and the specific material parameters are density ρ = 7780kg / m 3 , shear modulus E = 2.106 × 1010 Pa, Poisson's ratio μ = 0.3; Figure 4 , 5 It can be seen that the structure has a band gap in the range of 0-3000 Hz, where the band gaps are 280-500 Hz and 510-2800 Hz. It can be seen that the use of the new umbrella-shaped elastic metamaterial structure of the present invention can generate a band gap in a wide frequency range and effectively control vibrations in different frequency domains.

[0036] Therefore, the umbrella-shaped elastic metamaterial plate structure of the present invention can be applied to shock absorption and vibration isolation of precision mechanical instruments and equipment, and can protect the precision instruments and equipment from vibrating in various frequency domains and ensure normal use.

[0037] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. An umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics, characterized in that: It comprises an umbrella cap (1), an elastic circular ring-shaped structure (2) and an umbrella column (3); the umbrella cap (1) and the umbrella column (3) are connected by the elastic circular ring-shaped structure (2), and a cavity (4) is formed between the umbrella cap (1) and the umbrella column (3); The umbrella cap (1) has a shape of: a first hemispherical shell with a top portion cut off, the height of the top portion of the first hemispherical shell being cut off is less than the difference between the inner diameter and the outer diameter of the first hemispherical shell; a plane formed after the top portion of the first hemispherical shell is cut off is parallel to the hemispherical surface of the first hemispherical shell; The elastic annular structure (2) is in the shape of: a second hemispherical shell with a top portion cut off, the top portion of the second hemispherical shell being cut off to form a ring, and the bottom surface of the cut-off top portion of the second hemispherical shell being parallel to the hemispherical surface of the second hemispherical shell; The umbrella-shaped elastic metamaterial structure is axisymmetric along the axis of the umbrella column (3).

2. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 1, characterized in that: The umbrella cap (1), the elastic annular structure (2) and the umbrella column (3) are all made of different materials.

3. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 2, characterized in that: The umbrella cap (1) is made of epoxy resin material; the elastic annular structure (2) is made of rubber material; and the umbrella column (3) is made of steel material.

4. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 1, characterized in that: The umbrella column (3) comprises a solid hemisphere (31) and a cylinder (32); the hemispherical surface of the solid hemisphere (31) is connected to the top of the cylinder (32); and the top surface of the cylinder (32) has the same area as the hemispherical surface of the solid hemisphere (31).

5. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 4, characterized in that: The inner hemispherical shell diameter of the first hemispherical shell matches the outer hemispherical shell diameter of the second hemispherical shell; the inner hemispherical shell diameter of the second hemispherical shell matches the diameter of the solid hemispherical body (31); the inner ring of the elastic annular structure (2) is connected to the solid hemispherical body (31), and the inner wall of the umbrella cap (1) is connected to the outer ring of the elastic annular structure (2).

6. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 5, characterized in that: The inner hemispherical shell diameter of the first hemispherical shell is 16 mm, the outer hemispherical shell diameter is 20 mm, and the distance between the top surface and the bottom surface of the hemispherical shell is 9 mm; the inner ring diameter of the elastic annular structure (2) is 14 mm, the outer ring diameter is 16 mm, and the height is 2 mm; the diameter of the solid hemispherical body (31) is 14 mm.

7. The umbrella-shaped elastic metamaterial structure with broadband vibration reduction characteristics according to claim 4, characterized in that: The height of the elastic annular structure (2) is smaller than the height of the umbrella cap (1) and the height of the solid hemispherical body (31).

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