CN116221316A

CN116221316A - Damping structure based on bionic honeycomb

Info

Publication number: CN116221316A
Application number: CN202211713651.6A
Authority: CN
Inventors: 刘湃; 王小勇; 郭崇岭; 赵野; 李玲; 丁锴铖; 王茫茫; 隋请; 武文晋
Original assignee: Beijing Institute of Space Research Mechanical and Electricity
Current assignee: Beijing Institute of Space Research Mechanical and Electricity
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-06

Abstract

The invention relates to a damping structure based on a bionic honeycomb, which comprises a damping layer and a rigid constraint layer, wherein the damping layer adopts a microstructure form with a bionic honeycomb configuration; the rigid constraint layer adopts a solid structure, is made of high-rigidity aluminum alloy or titanium alloy or carbon fiber composite material, and is adhered to a structure needing vibration reduction through an adhesive when in use, when the structure is excited to vibrate, the surface of the structure generates bending deformation, the damping material adhered to the structure generates shearing deformation under the limitation of the rigid constraint layer, and according to the loss characteristic of the damping material, the energy of mechanical vibration is converted into heat energy to be dissipated, so that the vibration suppression effect is achieved. The invention can effectively restrain vibration of structure under the condition of high rigidity and low weight.

Description

Damping structure based on bionic honeycomb

Technical Field

The invention relates to a damping structure based on a bionic honeycomb, and belongs to the technical field of passive damping vibration attenuation.

Background

In the field of aerospace, the plate shell type structural form is widely applied to various bearing structures due to the characteristics of simple form, continuous force transmission, easy high rigidity, light weight design and the like. With the development of aerospace technology, the spacecraft is developing towards large-scale, high-precision and high-stability. For large structures, especially large-size plate-and-shell structures, due to the small damping, large radiation area and high radiation efficiency, vibrations are easier to generate and take a long time to attenuate when subjected to severe emission mechanical environments, resulting in the problem of low structural stability.

The current common vibration suppression method is to apply a damping structure with a solid constraint damping layer on the structure, when the structure is deformed by vibration, the damping structure can convert the energy of mechanical vibration into self heat energy to dissipate, so as to achieve the purpose of reducing vibration response. However, the damping material has low modulus, so that the damping material is applied more to meet the requirements of rigidity and damping, the weight of the structure can be greatly increased, and the design requirements of high rigidity, high light weight and high damping are not met.

Disclosure of Invention

The invention solves the technical problems that: the damping structure based on the bionic honeycomb is provided, and vibration of the structure is effectively restrained under the condition of high rigidity and low weight.

The solution of the invention is as follows:

a damping structure based on a bionic honeycomb comprises a damping layer and a rigid constraint layer, wherein the damping layer adopts a microstructure form with a bionic honeycomb configuration; the rigid constraint layer adopts a solid structure, is made of high-rigidity aluminum alloy or titanium alloy or carbon fiber composite material, and is adhered to a structure needing vibration reduction through an adhesive when in use, when the structure is excited to vibrate, the surface of the structure generates bending deformation, the damping material adhered to the structure generates shearing deformation under the limitation of the rigid constraint layer, and according to the loss characteristic of the damping material, the energy of mechanical vibration is converted into heat energy to be dissipated, so that the vibration suppression effect is achieved.

Furthermore, the damping layer adopts a microstructure form with a bionic honeycomb structure, and the cross section of the single cell is regular hexagon.

Further, the bottom is conical consisting of three equal diamonds.

Further, it is preferable that the obtuse angle of each diamond is 109 ° 28'.

Further, it is preferable that the acute angle of each diamond is 70 ° 32'.

Further, the damping layer is formed by cell microstructure arrays, the height direction is N layers, and the upper layer bottom conical surface and the lower layer bottom conical surface are mutually intersected in pairs and mutually embedded.

Furthermore, the damping layer adopts a microstructure form with a bionic honeycomb structure and is high damping rubber.

Further, the rigid constraint layer adopts a solid structure and is made of high-rigidity aluminum alloy material.

Further, the rigid constraint layer adopts a solid structure and is made of titanium alloy materials.

Further, the rigid constraint layer adopts a solid structure and is made of a carbon fiber composite material.

Compared with the prior art, the invention has the beneficial effects that:

(1) Compared with the traditional solid damping layer, the damping layer with the bionic honeycomb structure is high in light weight rate, the weight can be greatly reduced on the premise of ensuring the damping performance, and the damping efficiency is higher;

(2) Compared with the conventional honeycomb structure with a plane bottom, the bionic honeycomb structure adopted by the invention has the advantages that the conical surface at the bottom of the cell can enhance the capability of resisting lateral excitation, the overall rigidity is higher, and the damping characteristic is better; the structure simultaneously considers the rigidity and the damping performance, and is an excellent solution of the damping structure;

(3) The cell configuration of the invention is more beneficial to the expansion of the structure in the length, width and height directions, especially in the height direction, and as the intersecting surfaces are conical surfaces, the conical surfaces are intersected pairwise and mutually embedded when in lamination expansion, and the rigidity and the reliability are better.

Drawings

FIG. 1 is a schematic view of a damping structure

FIG. 2 is a schematic diagram of a biomimetic cellular cell of a damping layer;

fig. 3 is a schematic diagram of a damping layer bionic honeycomb (2 layers).

Detailed Description

The invention is further illustrated below with reference to examples.

As shown in fig. 1, the damping structure based on the bionic honeycomb comprises a rigid constraint layer 1 and a damping layer 2, wherein the rigid constraint layer 1 and the damping layer 2 are formed into a whole through gluing, the rigid constraint layer 1 is preferably made of a titanium alloy material with high modulus, and the damping layer 2 is preferably made of a rubber material with high damping performance; when in use, the damping structure is adhered to the structural matrix 3 through glue, and the structural matrix 3 is generally an area with larger amplitude and needing vibration reduction in a bearing structure. Wherein the microstructure cells of the damping layer 2 are designed based on a biomimetic honeycomb, as shown in fig. 2. The cross section of the single cell is regular hexagon, the bottom is conical composed of three equal diamonds, preferably the obtuse angle of each diamond is 109 DEG 28', and the acute angle is 70 DEG 32'.

The damping layer is formed by the cell microstructure array of fig. 2, the height direction can be N layers, the upper and lower bottom conical surfaces are intersected in pairs and mutually embedded, and fig. 3 shows a schematic diagram of the damping layer when n=2 layers. When the structural matrix 3 vibrates, the structural matrix itself generates bending deformation, the damping structure also generates deformation due to adhesion of the damping structure, and mechanical energy is converted into heat energy to be dissipated during deformation due to the damping characteristic of the damping material, so that the vibration energy is attenuated, and the purpose of reducing vibration response is achieved. Based on the microstructure configuration of the bionic honeycomb cell, the damping efficiency is higher and the damping effect is more obvious under the same weight constraint.

The damping layer of the damping structure adopts a scheme with a simulated honeycomb microstructure configuration;

the simulated honeycomb cell configuration of the invention is a hexagonal section, and the bottom surface is designed as a conical bottom surface with 3 diamonds;

the preferred angle of each diamond shape of the cell bottom surface is: the obtuse angle is 109 DEG 28', and the acute angle is 70 DEG 32';

the simulated honeycomb cell can be expanded, in particular to a laminated expansion mode in the height direction, the bottom conical surfaces are mutually embedded in pairs, and the rigidity and the reliability are higher.

Compared with the traditional solid damping layer, the damping layer with the bionic honeycomb structure is high in light weight rate, the weight can be greatly reduced on the premise of ensuring the damping performance, and the damping efficiency is higher;

compared with the conventional honeycomb structure with a plane bottom, the bionic honeycomb structure adopted by the invention has the advantages that the conical surface at the bottom of the cell can enhance the capability of resisting lateral excitation, the overall rigidity is higher, and the damping characteristic is better; the structure simultaneously considers the rigidity and the damping performance, and is an excellent solution of the damping structure;

the cell configuration of the invention is more beneficial to the expansion of the structure in the length, width and height directions, especially in the height direction, and as the intersecting surfaces are conical surfaces, the conical surfaces are intersected pairwise and mutually embedded when in lamination expansion, and the rigidity and the reliability are better.

Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.

Claims

1. The damping structure based on the bionic honeycomb is characterized by comprising a damping layer and a rigid constraint layer, wherein the damping layer adopts a microstructure form with a bionic honeycomb configuration; the rigid constraint layer adopts a solid structure, is made of high-rigidity aluminum alloy or titanium alloy or carbon fiber composite material, and is adhered to a structure needing vibration reduction through an adhesive when in use, when the structure is excited to vibrate, the surface of the structure generates bending deformation, the damping material adhered to the structure generates shearing deformation under the limitation of the rigid constraint layer, and according to the loss characteristic of the damping material, the energy of mechanical vibration is converted into heat energy to be dissipated, so that the vibration suppression effect is achieved.

2. The damping structure based on the bionic honeycomb according to claim 1, wherein the damping layer adopts a microstructure form with a bionic honeycomb configuration, and the cross section of the single cell is regular hexagon.

3. A damping structure based on a biomimetic honeycomb according to claim 2, wherein the bottom is conical consisting of three equal diamonds.

4. A biomimetic honeycomb based damping structure according to claim 3, wherein preferably the obtuse angle of each diamond is 109 ° 28'.

5. A biomimetic honeycomb based damping structure according to claim 3, wherein the acute angle of each diamond is preferably 70 ° 32'.

6. The damping structure based on bionic honeycomb according to claim 1, wherein the damping layer is formed by cell microstructure arrays, the height direction of the damping layer is N layers, and the upper layer bottom conical surface and the lower layer bottom conical surface are intersected in pairs and are mutually embedded.

7. The damping structure based on the bionic honeycomb according to claim 1, wherein the damping layer adopts a microstructure form with a bionic honeycomb configuration and is made of high damping rubber.

8. The damping structure based on bionic honeycomb according to claim 1, wherein the rigid constraint layer is a solid structure and is made of high-rigidity aluminum alloy material.

9. The damping structure based on bionic honeycomb according to claim 1, wherein the rigid constraint layer is a solid structure and is made of titanium alloy material.

10. The damping structure based on bionic honeycomb according to claim 1, wherein the rigid constraint layer is a solid structure and is made of carbon fiber composite material.