Annular shock absorber based on metal honeycomb structure and mounting method of annular shock absorber

Abstract

The annular shock absorber based on the metal honeycomb structure comprises a buffer module and a metal plate, the buffer module is annular and comprises a honeycomb structure, the honeycomb structure is arranged in the direction of the center axis of the annular shock absorber, and the density of the honeycomb structure is determined according to a low-pass filtering threshold value and a crushing space needed by the annular shock absorber. The metal plates are arranged at the two ends of the buffer module and cover the end face of the honeycomb structure. The annular structure can reduce local stress and optimize the stress uniformity of a system, the honeycomb structure can reduce the overall mass of the shock absorber on one hand, and on the other hand, the honeycomb structure can generate crushing deformation to generate action only when the impact energy is higher than a specified impact energy threshold value, so that the initial kinetic energy is greatly reserved, and the overall system efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the field of aerospace technology, and in particular to an annular vibration damper based on a metal honeycomb structure and a mounting method thereof. Background Art

[0002] In the aerospace field, aerospace vehicles are often subjected to various types of impacts. Therefore, corresponding vibration reduction measures need to be taken to avoid damage to the aircraft caused by impacts. At present, aerospace vehicles mostly use Si-based rubber pads, metal rubber, metal damping rods and other vibration reduction methods, but these vibration reduction methods are mainly used to deal with the frequency domain impact generated when the aerospace vehicle is unlocked, and cannot be applied to the ms-level time domain thousand-g level (10,000 m / s 2 The mechanical environment of high-level (level) impact makes it difficult to solve high-level time-domain impact vibration.

[0003] In ground equipment, high-level time-domain impact vibrations can be dealt with by, for example, crushing the shock absorber itself to achieve impact attenuation. However, attenuating impact vibrations through its own non-directional energy absorption, as the mass of the damped section increases, the absorption of kinetic energy by the damping link will directly affect the initial velocity of the structure, reducing system efficiency. In addition, this type of method has a large vibration reduction environment mass and volume, and is poorly compatible with aerospace vehicles, making it difficult to apply to the aerospace field.

[0004] In addition, existing shock absorbers lack the ability to attenuate a specified energy range, and usually adopt a "catch-all" approach to absorb external energy from scratch. In application scenarios with a large mass ratio of the dampened section, this will increase the kinetic energy loss of the system itself. Summary of the invention

[0005] In view of some or all of the problems in the prior art, the present invention provides, in a first aspect, an annular vibration damper based on a metal honeycomb structure, comprising:

[0006] A buffer module, which is annular and includes a honeycomb structure, wherein the honeycomb structure is arranged along the central axis direction of the annular vibration damper, and the density of the honeycomb structure is determined according to the low-pass filter threshold and the crushing space required by the annular vibration damper; and

[0007] The metal plates are arranged at both ends of the buffer module and cover the end surfaces of the buffer module.

[0008] Furthermore, the density of the honeycomb structure satisfies the low-wave filtering threshold required by the annular vibration damper:

[0009] P cr =(π 2 ·E·I) / (K·L e ) 2 ,

[0010] Pcr =(m S ·a S ) / (ρ A ·A e ·S h ),

[0011]

[0012] Among them, P cr is the critical load for instability, E is the elastic modulus of the material, I is the moment of inertia of the section, K is the constraint coefficient, and L e is the bending length, m S is the mass of the damped system, a S is the impact acceleration of the damped system, ρ A is the honeycomb surface density of the honeycomb structure, A e is the envelope area of ​​the honeycomb cross section, S h is the cross-sectional area of ​​the standard honeycomb in the honeycomb sandwich.

[0013] Furthermore, the honeycomb structure comprises hexagonal cells.

[0014] Furthermore, the cross-sectional area S of the hexagonal cells is h With the thickness of adjacent honeycomb h satisfy:

[0015]

[0016] Among them, S a is the hexagonal area enclosed by the outer contour of the hexagonal cell, S b is the hexagonal area enclosed by the inner contour of the hexagonal cell, l a , l b are the side lengths of the outer and inner contours of the hexagonal cells, respectively.

[0017] Furthermore, the side length of the inner contour of the hexagonal cells is 3.7 to 6 mm. Furthermore, the thickness b of adjacent honeycombs of the honeycomb structure is h Determine according to the required vibration reduction threshold of the annular vibration absorber:

[0018]

[0019] Furthermore, the thickness of adjacent honeycombs of the honeycomb structure is 0.1 to 0.15 mm.

[0020] Furthermore, the buffer module is made of steel.

[0021] Furthermore, the metal plate is ring-shaped.

[0022] Furthermore, the metal plate is made of aluminum alloy.

[0023] Furthermore, the metal plate is bonded to both ends of the buffer module.

[0024] A second aspect of the present invention provides a method for installing the annular vibration damper as described above, comprising:

[0025] Sleeving the annular vibration damper on the boss of the main structure; and

[0026] A static pressure process is used to press a metal plate on one side of the annular vibration damper, wherein a pressure value used in the static pressure process is not greater than a specified energy threshold.

[0027] The present invention provides an annular vibration damper based on a metal honeycomb structure, which has an overall annular structure and contacts the main structure through the annular plane, thereby reducing the local stress of the main structure and optimizing the force uniformity of the system. The annular vibration damper adopts a honeycomb structure, which can significantly reduce the overall mass of the vibration damper on the one hand, and on the other hand, the honeycomb structure realizes energy low-pass filtering based on the principle of structural instability, and it will only cause crushing and deformation to take effect above a specified impact energy threshold. Therefore, it can greatly retain the initial kinetic energy, improve the overall system efficiency, and realize controllable crushing. During installation, a static pressure process can be used for pretreatment to induce the honeycomb structure to deform immediately at a specified energy threshold when it is impacted, thereby eliminating the impact peak caused by structural instability during impact vibration reduction and avoiding secondary impact. The annular vibration damper can withstand large overload impact levels, up to the ms level in the time domain of kilograms (10,000 m / s 2 class). BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To further illustrate the above and other advantages and features of various embodiments of the present invention, a more specific description of various embodiments of the present invention will be presented with reference to the accompanying drawings. It will be understood that these drawings only depict typical embodiments of the present invention and are therefore not to be considered as limiting the scope thereof. In the accompanying drawings, for clarity, identical or corresponding parts will be represented by identical or similar reference numerals.

[0029] Figure 1 A schematic structural diagram of an annular vibration damper based on a metal honeycomb structure according to an embodiment of the present invention is shown;

[0030] Figure 2 A schematic side view of an annular vibration damper based on a metal honeycomb structure according to an embodiment of the present invention; and

[0031] Figure 3 A schematic top view of a buffer module of an annular vibration damper based on a metal honeycomb structure according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0032] In the following description, the present invention is described with reference to various embodiments. However, those skilled in the art will recognize that various embodiments can be implemented without one or more specific details or with other replacement and / or additional methods, materials or components. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid blurring the inventive point of the present invention. Similarly, for the purpose of explanation, specific quantities, materials and configurations are set forth to provide a comprehensive understanding of embodiments of the present invention. However, the present invention is not limited to these specific details. In addition, it should be understood that the various embodiments shown in the drawings are illustrative representations and are not necessarily drawn in correct proportions.

[0033] In this specification, reference to "one embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in this specification does not necessarily all refer to the same embodiment.

[0034] It should be noted that the embodiments of the present invention describe the process steps in a specific order, but this is only for the purpose of illustrating the specific embodiment, rather than limiting the order of the steps. On the contrary, in different embodiments of the present invention, the order of the steps can be adjusted according to the adjustment of the process.

[0035] In order to cope with high-level time-domain impact vibration, the present invention provides an annular shock absorber based on a metal honeycomb structure, which includes a composite structure of a metal honeycomb interlayer and a metal plate, and adopts a circumferential surround design. In order to achieve controllable crushing, the annular shock absorber achieves the goal of energy low-pass filtering based on the principle of structural instability, that is, the annular shock absorber will only undergo crushing deformation and produce an effect above a specified impact energy threshold. The annular shock absorber adopts a configuration of a honeycomb interlayer plus a double-layer metal plate, the metal plate is bonded to the honeycomb plate, the honeycomb interlayer adopts high-strength steel, and the metal plate adopts an aluminum alloy. The setting of the structural parameters of the honeycomb interlayer can be determined according to the required shock absorber performance, wherein the honeycomb density determines the filtering threshold of the shock absorber, and the size of the honeycomb grid needs to provide space for structural crushing, and the two restrict each other. Based on this, the honeycomb interlayer can achieve the height of the shock absorption threshold by adjusting the wall thickness of the honeycomb layer, and the axial actuation range of the shock absorber can be adjusted by adjusting the honeycomb density. The annular shock absorber is annular in structure as a whole, and is fixed by applying an axial preload force through the main structure boss, which can reduce local stress and optimize the force uniformity of the system. In addition, during installation and use, the annular vibration damper is pre-treated by a static pressure process, which can induce the honeycomb structure to deform immediately at a specified energy threshold when impacted, thereby eliminating the impact peak caused by structural instability during impact vibration damping and avoiding secondary impact.

[0036] Compared with most current shock absorbers, the annular shock absorber can withstand higher overload impact levels, up to 1,000 g in the ms time domain (10,000 m / s 2 Level). Compared with the shock absorbers of the same level of performance, the steel honeycomb structure used in the annular shock absorber can significantly reduce the overall mass of the shock absorber. The annular shock absorber achieves vibration reduction based on the principle of structural instability. It only produces deformation in the specified energy range, greatly retains the initial kinetic energy, and effectively improves the overall system efficiency. Static pressure pretreatment can effectively eliminate the impact peak generated by the shock absorber when the structure is unstable, greatly improving the application effect of vibration reduction based on the principle of structural instability.

[0037] The technical solution of the present invention is further described below in conjunction with the accompanying drawings of the embodiments.

[0038] Figure 1 FIG. 1 is a schematic diagram showing the structure of an annular vibration damper based on a metal honeycomb structure according to an embodiment of the present invention. Figure 1 As shown, an annular vibration damper based on a metal honeycomb structure is annular in configuration and includes a buffer module 101 and a metal plate 102 , wherein the metal plate 102 is disposed at both ends of the buffer module 101 .

[0039] In one embodiment of the present invention, the buffer module 101 is annular and includes a honeycomb structure. The honeycomb structure is vertically arranged, specifically, along the central axis direction of the annular shock absorber, that is, the impact direction. The metal plates 102 are arranged at both ends of the honeycomb structure and cover the end faces of the honeycomb structure. Figure 2 The honeycomb structure comprises a plurality of regularly shaped polygonal cells arranged continuously, and the central axis of the regularly shaped polygonal cells is parallel to the central axis of the annular shock absorber to better cope with the impact. In one embodiment of the present invention, the honeycomb structure adopts a hexagonal cell 301, as shown in FIG. Figure 3 Compared with other regular polygon structures, the hexagonal cell has a more stable compression capacity. When crushed, it can effectively accommodate the honeycomb material during compression, folding and deformation, and has high crushing flatness and positioning accuracy.

[0040] In one embodiment of the present invention, the buffer module 101 is made of high-strength steel. As mentioned above, in one embodiment of the present invention, the vibration reduction threshold can be controlled by adjusting the wall thickness of the honeycomb structure, and / or the axial actuation range of the shock absorber can be adjusted by adjusting the density of the cells of the honeycomb structure. Specifically, according to the Euler elastic buckling formula and the energy conservation theorem, in one embodiment of the present invention, the low-pass filter threshold of the annular shock absorber and the size of each cell of the honeycomb structure have the following relationship:

[0041] P cr=(π2·E·I) / (K·L e ) 2 ,

[0042] P cr =(m S ·a S ) / (ρ A ·A e ·S h ),

[0043]

[0044] Among them, P cr is the critical load for instability, E is the elastic modulus of the material, I is the moment of inertia of the section, K is the constraint coefficient, and L e is the bending length, m S is the mass of the damped system, a S is the impact acceleration of the damped system, ρ A is the honeycomb surface density of the honeycomb structure, A e is the envelope area of ​​the honeycomb cross section, S h is the cross-sectional area of ​​the standard honeycomb in the honeycomb sandwich.

[0045] In one embodiment of the present invention, the honeycomb structure adopts a standard hexagonal honeycomb as a basic configuration, that is, the honeycomb structure includes hexagonal cells, wherein the cross-sectional area S of the hexagonal cells is h With the thickness of adjacent honeycomb h The following relationship exists:

[0046]

[0047] Among them, S a is the hexagonal area enclosed by the outer contour of the hexagonal cell, S b is the area of ​​the hexagon enclosed by the inner contour of the hexagonal grid, i.e. the area of ​​the hollow part, l a , l b are the side lengths of the outer and inner hexagons respectively.

[0048] In one embodiment of the present invention, the side length l of the inner hexagon b The value range is 3.7 to 6 mm. Using hexagonal cells of this size can make the crushing process of the honeycomb structure more balanced and sufficient, and the vibration reduction effect is better.

[0049] In one embodiment of the present invention, the thickness b of adjacent honeycombs is h The relationship with the vibration reduction threshold is as follows:

[0050]

[0051] In one embodiment of the present invention, the thickness of adjacent honeycombs ranges from 0.1 to 0.15 mm.

[0052] like Figure 1 As shown, the metal plate 102 is also annular, which is arranged at both ends of the buffer module 101 and covers the end surface of the buffer module 101. In one embodiment of the present invention, the metal plate 102 is bonded to both ends of the buffer module 101 by a bonding process. In one embodiment of the present invention, the metal plate 102 is made of high-strength aluminum alloy material. The metal plate 102 serves as the contact surface with the component to be damped, and its surface is flat. The use of an annular structure can reduce the local stress of the component to be damped and optimize the force uniformity of the system.

[0053] The annular vibration damper can be applied to equipment such as aerospace vehicles, for example, by being arranged on the surface of the main structure. Specifically, the annular vibration damper can be sleeved on the boss of the main structure, and then installed by pre-pressing. With this installation method, there is no fastener interface, which can effectively solve the problem of excessive local stress of the main structure during high-level impact. In addition, pre-treatment with a static pressure process can induce the honeycomb structure to deform immediately at a specified energy threshold when it is impacted, eliminate the impact peak caused by structural instability during impact vibration reduction, and avoid secondary impact. To achieve this purpose, in one embodiment of the present invention, the pressure used in the static pressure process should not be greater than the specified energy threshold.

[0054] The present invention provides an annular vibration damper based on a metal honeycomb structure, which is annular in structure as a whole. The annular plane contacts the main structure, which can reduce the local stress of the main structure and optimize the force uniformity of the system. The annular vibration damper adopts a honeycomb structure. On the one hand, it can significantly reduce the overall mass of the vibration damper. On the other hand, the honeycomb structure realizes energy low-pass filtering based on the principle of structural instability. It will only cause crushing and deformation above a specified impact energy threshold. Therefore, it can greatly retain the initial kinetic energy and improve the overall system efficiency. During installation, a static pressure process can be used for pretreatment to induce the honeycomb structure to deform immediately at a specified energy threshold when it is impacted, thereby eliminating the impact peak caused by structural instability during impact vibration reduction and avoiding secondary impact. The annular vibration damper can withstand large overload impact levels, up to the ms level in the time domain of kilograms (10,000 m / s 2 class).

[0055] Although various embodiments of the present invention are described above, it should be understood that they are presented as examples only and not as limitations. It is obvious to those skilled in the relevant art that various combinations, modifications and changes can be made thereto without departing from the spirit and scope of the present invention. Therefore, the breadth and scope of the present invention disclosed herein should not be limited by the exemplary embodiments disclosed above, but should only be defined according to the attached claims and their equivalents.

Claims

1. An annular vibration damper based on a metal honeycomb structure, characterized in that: include: A buffer module, which is annular and includes a honeycomb structure, wherein the honeycomb structure is arranged along the central axis direction of the annular vibration damper, and the density of the honeycomb structure is determined according to the low-pass filter threshold and the crushing space required by the annular vibration damper; as well as The metal plates are arranged at both ends of the buffer module and cover the end surfaces of the honeycomb structure.

2. The annular vibration damper according to claim 1, characterized in that: The density of the honeycomb structure meets the low-wave filtering threshold required by the annular vibration damper: P cr =(π 2 ·E·I) / (K·L e ) 2 , P cr =(m S ·a S ) / (ρ A ·A e ·S h ), Among them, P cr is the critical load for instability, E is the elastic modulus of the material, I is the moment of inertia of the section, K is the constraint coefficient, and L e is the bending length, m S is the mass of the damped system, a S is the impact acceleration of the damped system, ρ A is the honeycomb surface density of the honeycomb structure, A e is the envelope area of ​​the honeycomb cross section, S h is the cross-sectional area of ​​the standard honeycomb in the honeycomb sandwich.

3. The annular vibration damper according to claim 2, characterized in that: The honeycomb structure includes hexagonal cells.

4. The annular vibration damper according to claim 3, characterized in that: The cross-sectional area S of the hexagonal cells h With the thickness of adjacent honeycomb h satisfy: Among them, S a is the hexagonal area enclosed by the outer contour of the hexagonal cell, S b is the hexagonal area enclosed by the inner contour of the hexagonal cell, l a , l b are the side lengths of the outer and inner contours of the hexagonal cells, respectively.

5. The annular vibration damper according to claim 4, characterized in that: The side length of the inner contour of the hexagonal cells is 3.7 to 6 mm.

6. The annular vibration damper according to claim 4, characterized in that: The thickness b of adjacent honeycombs in the honeycomb structure h Determine according to the required vibration reduction threshold of the annular vibration absorber:

7. The annular vibration damper according to claim 4, characterized in that: The thickness of adjacent honeycombs in the honeycomb structure is 0.1 to 0.15 mm.

8. The annular vibration damper according to claim 1, characterized in that: The buffer module is made of steel; and / or The material of the metal plate is aluminum alloy.

9. The annular vibration damper according to claim 1, characterized in that: The metal plate is annular and is bonded to two ends of the buffer module.

10. A method for installing an annular vibration damper according to any one of claims 1 to 9, characterized in that: Includes steps: Sleeving the annular vibration damper on the boss of the main structure; and A static pressure process is used to press a metal plate on one side of the annular vibration damper, wherein a pressure value used in the static pressure process is not greater than a specified energy threshold.

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