Annular damper based on a metallic honeycomb structure and method for mounting same

Abstract

The application discloses a metal honeycomb structure-based ring damper, which comprises a buffer module and a metal plate, wherein the buffer module is ring-shaped and comprises a honeycomb structure arranged along the central axis direction of the ring damper, and the density of the honeycomb structure is determined according to the low-pass filtering threshold and the crushing space required by the ring damper; the metal plate is arranged at both ends of the buffer module and covers the end faces of the honeycomb structure. The ring structure can reduce local stress and optimize the stress uniformity of the system, and the honeycomb structure can reduce the overall mass of the damper on one hand and can only be deformed to generate an effect when the impact energy threshold is above a specified value on the other hand, so that the initial kinetic energy is greatly reserved, and the overall system efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aerospace technology, in particular to a ring-shaped damper based on a metal honeycomb structure and a mounting method thereof. BACKGROUND

[0002] In the field of aerospace, aerospace vehicles often suffer from various impacts, and therefore, corresponding damping means need to be taken to avoid damage to the vehicles caused by the impacts. At present, Si-based rubber pads, metal rubber, metal damping rods and other damping methods are mostly used in aerospace vehicles, but these damping methods mainly cope with the frequency domain impact generated when the aerospace vehicle is unlocked, and cannot be applied to the mechanical environment of ms-level time domain thousand-g-level (ten m / s 2 ) impact, and therefore it is difficult to solve high-level time domain impact vibration.

[0003] In ground equipment, high-level time domain impact vibration can be addressed, for example, by the way of self-collapse of the damper to achieve impact attenuation. However, by self-non-directional energy absorption to attenuate impact vibration, as the mass of the damped section increases, the absorption of kinetic energy by the damping link will directly affect the initial speed of the structure body, reducing the system efficiency, and such methods have poor adaptability to aerospace vehicles due to large damping environment mass and volume, and are difficult to apply to the field of aerospace.

[0004] In addition, the existing damper lacks the ability to attenuate for a specified energy range, and generally uses a "all-in" method starting from zero to absorb external energy, which will increase the kinetic energy loss of the system body in the application scenario of a larger mass ratio of the damped section. SUMMARY

[0005] To solve some or all of the problems of the prior art, the first aspect of the present application provides a ring-shaped damper based on a metal honeycomb structure, comprising:

[0006] a buffer module, which is ring-shaped and comprises a honeycomb structure, the honeycomb structure being arranged along the central axis direction of the ring-shaped damper, and the density of the honeycomb structure being determined according to the low-pass filtering threshold and the collapse space required by the ring-shaped damper; and

[0007] a metal plate arranged at both ends of the buffer module and covering the end face of the buffer module.

[0008] Further, the density of the honeycomb structure and the low-pass filtering threshold required by the ring-shaped damper satisfy:

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

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

[0011]

[0012] wherein P cr is the critical buckling load, E is the material elastic modulus, I is the cross-sectional moment of inertia, K is the constraint coefficient, L e is the length of bending, m S is the mass of the system to be damped, a S is the impact acceleration of the system to be damped, p 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] Further, the honeycomb structure comprises hexagonal cells.

[0014] Further, the cross-sectional area S h of the hexagonal cell and the thickness b h of the adjacent honeycomb satisfy:

[0015]

[0016] wherein S a is the area of the hexagon 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 cell, l a , l b are the lengths of the sides of the outer contour and the inner contour of the hexagonal cell, respectively.

[0017] Further, the length of the side of the inner contour of the hexagonal cell is 3.7 to 6 mm. Further, the thickness b h of the adjacent honeycomb of the honeycomb structure is determined according to the damping threshold required by the ring-shaped damper:

[0018]

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

[0020] Further, the material of the buffer module is steel.

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

[0022] Further, the material of the metal plate is aluminum alloy.

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

[0024] The second aspect of the present application provides a mounting method of the annular damper as described above, comprising:

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

[0026] pressing a metal plate of the annular damper by using a static pressure process, wherein the pressure value used by the static pressure process is not greater than a specified energy threshold.

[0027] The annular damper based on the metal honeycomb structure provided by the present application has a whole annular structure, and can reduce the local stress of the main structure and optimize the stress uniformity of the system by contacting the main structure through the annular plane. The annular damper adopts the honeycomb structure, which can significantly reduce the overall mass of the damper on one hand, and can realize low-pass filtering of energy based on the structural instability principle on the other hand. The honeycomb structure will only be deformed to produce an effect when the specified energy threshold is exceeded, so it can greatly retain the initial kinetic energy, improve the overall system efficiency, and realize controllable crushing. When installing, the static pressure process can be used for pretreatment to induce the honeycomb structure to deform immediately at the specified energy threshold when impacted, eliminate the impact peak generated by structural instability during impact damping, and avoid secondary impact. The annular damper can withstand large overload impact magnitude, and the maximum can reach the ms time domain kilog level (ten m / s 2 BRIEF DESCRIPTION OF DRAWINGS

[0028] To further clarify the above and other advantages and features of the embodiments of the present application, a more particular description of embodiments of the application will be rendered by reference to specific drawings. It is appreciated that these drawings depict only typical embodiments of the application and are therefore not to be considered limiting of its scope. The drawings will be described with additional specificity and detail in the following description.

[0029] Figure 1 FIG. 1 shows a structural schematic diagram of an annular damper based on a metal honeycomb structure according to an embodiment of the present application;

[0030] Figure 2 FIG. 2 shows a side view schematic diagram of an annular damper based on a metal honeycomb structure according to an embodiment of the present application; and

[0031] Figure 3 FIG. 3 shows a top view schematic diagram of a buffer module of an annular damper based on a metal honeycomb structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0032] ​In the following description, reference is made to specific embodiments of the application. Those skilled in the art will recognize that the application can be practiced with

[0033] Reference throughout this specification to "an embodiment" or "the embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0034] It is noted that the embodiments of the application are described with specific sequences of steps, however, this is only for the sake of explanation and not meant to limit the order of the steps. In fact, in different embodiments of the application, the order of the steps can be adjusted according to the adjustment of the process.

[0035] In order to deal with high order time domain impact vibration, the application provides a ring-shaped damper based on metal honeycomb structure, which includes a composite structure of metal honeycomb sandwich and metal plate, and adopts a circumferential ring design. In order to crush controllably, the ring-shaped damper realizes the goal of energy low-pass filtering based on the principle of structural instability, that is, the ring-shaped damper will only crush and deform to produce effect above the specified impact energy threshold. The ring-shaped damper adopts the configuration of honeycomb sandwich and double-layer metal plate, the metal plate is bonded with the honeycomb plate, the honeycomb sandwich adopts high-strength steel, and the metal plate adopts aluminum alloy. The structural parameters of the honeycomb sandwich can be determined according to the required damper performance, in which the honeycomb density determines the filtering threshold of the damper, and the honeycomb grid size needs to provide space for structural crushing, which are mutually restricted. Based on this, the honeycomb sandwich can realize the high and low of the damping threshold by adjusting the size of the honeycomb layer wall thickness, and adjust the axial actuation interval of the damper by adjusting the density of the honeycomb. The ring-shaped damper is in a ring structure as a whole, and is fixed by applying axial pre-tightening force through the main structure boss, which can reduce local stress and optimize the stress uniformity of the system. In addition, during installation and use, the ring-shaped damper is pre-processed by static pressure process to induce the honeycomb structure to deform immediately at the specified energy threshold when impacted, eliminate the impact peak generated by structural instability during impact damping, and avoid secondary impact.

[0036] Compared with most of the current shock absorbers, the ring-shaped shock absorber can withstand higher levels of overloading impact, up to the order of thousands of g (ten m / s 2 Compared with the same level of performance of the shock absorber, the steel honeycomb structure applied in the ring-shaped shock absorber can significantly reduce the overall mass of the shock absorber. The ring-shaped shock absorber is based on the principle of structural instability to achieve damping, which only produces deformation effect in a 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 structural instability of the shock absorber, greatly improving the application effect of the structural instability-based damping.

[0037] The technical solutions of the present application will be further described below in conjunction with the embodiment drawings.

[0038] Figure 1 A structural schematic diagram of a ring-shaped shock absorber based on a metal honeycomb structure is shown in an embodiment of the present application. As shown in Figure 1 A ring-shaped shock absorber based on a metal honeycomb structure is shown, which is in a ring-shaped configuration and includes a buffer module 101 and a metal plate 102, wherein the metal plate 102 is arranged at both ends of the buffer module 101.

[0039] In an embodiment of the present application, the buffer module 101 is ring-shaped and includes a honeycomb structure. The honeycomb structure is arranged vertically, specifically, along the central axis direction of the ring-shaped shock absorber, i.e., the impact direction, and the metal plate 102 is arranged at both ends of the honeycomb structure and covers the end faces of the honeycomb structure, as shown in Figure 2 The honeycomb structure includes a plurality of continuously arranged regular polygonal cells, and the central axis of the regular polygonal cell is parallel to the central axis of the ring-shaped shock absorber to better cope with the impact. In an embodiment of the present application, the honeycomb structure adopts a hexagonal cell 301, as shown in Figure 3 Compared with other regular polygonal structures, the hexagonal cell has a more stable compression capacity, can effectively accommodate the honeycomb material during compression folding deformation, and has high compression flatness and positioning accuracy.

[0040] In an embodiment of the present application, the buffer module 101 is made of high-strength steel material. As mentioned earlier, in an embodiment of the present application, the height of the damping 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 an embodiment of the present application, the low-pass filtering threshold of the ring-shaped 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] wherein P cr is the instability critical load, E is the material elastic modulus, I is the cross-section moment of inertia, K is the constraint coefficient, L e is the bending length, m S is the mass of the system to be damped, a S is the impact acceleration of the system to be damped, ρ A is the honeycomb surface density of the honeycomb structure, A e is the envelope area of the honeycomb cross-section, and S h is the cross-sectional area of the standard honeycomb in the honeycomb sandwich.

[0045] In an embodiment of the present application, the honeycomb structure adopts a standard hexagonal honeycomb as the basic configuration, i.e. the honeycomb structure comprises hexagonal cells, wherein the cross-sectional area S h of the hexagonal cell and the thickness b h of the adjacent honeycomb satisfy the following relationship:

[0046]

[0047] wherein S a is the area of the hexagon 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 cell, i.e. the area of the hollowed-out part, and l a , l b are the lengths of the sides of the outer hexagon and the inner hexagon, respectively.

[0048] In an embodiment of the present application, the length l b of the side of the inner hexagon is in the range of 3.7 to 6 mm. With the hexagonal cell of this size, the crushing process of the honeycomb structure is more balanced and sufficient, and the damping effect is better.

[0049] In an embodiment of the present application, the relationship between the thickness b h of the adjacent honeycomb and the damping threshold is as follows:

[0050]

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

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

[0053] The annular vibration damper can be applied to equipment such as spacecraft, for example, by mounting it on the surface of the main structure. Specifically, the annular vibration damper can be sleeved onto a boss of the main structure and then installed through pre-compression. This installation method eliminates the need for fastener interfaces, effectively solving the problem of excessive local stress in the main structure under high-level impacts. Furthermore, pre-treatment using a static pressure process can induce the honeycomb structure to deform immediately upon impact at a specified energy threshold, eliminating impact peaks caused by structural instability during impact damping and preventing secondary impacts. To achieve this, in one embodiment of the invention, the pressure used in the static pressure process should not exceed the specified energy threshold.

[0054] This invention provides a ring-shaped vibration damper based on a metal honeycomb structure. The overall structure is ring-shaped, and the ring plane contacts the main structure, reducing local stress in the main structure and optimizing the system's stress uniformity. The honeycomb structure significantly reduces the overall mass of the damper. Furthermore, based on the principle of structural instability, the honeycomb structure achieves low-pass energy filtering, only initiating crushing deformation above a specified impact energy threshold. Therefore, it greatly preserves initial kinetic energy and improves overall system efficiency. During installation, a hydrostatic pressure process can be used for pretreatment, inducing the honeycomb structure to deform immediately upon impact at a specified energy threshold, eliminating impact peaks caused by structural instability during impact damping and preventing secondary impacts. The ring-shaped vibration damper can withstand large overload impacts, up to the millisecond time domain kilogram level (tens of thousands of m / s). 2 class).

[0055] While the forgoing is a complete description of the embodiments of the application, it is to be understood that many alternatives, modifications, and variations thereof will be apparent to persons skilled in the art in light of the foregoing description. It is therefore, contemplated that the breadth and scope of the application should not be limited by that which has been specifically disclosed, but should be defined solely by the claims and their equivalents.

Claims

1. A toroidal damper based on a metallic honeycomb structure, characterized in that, Comprising: a buffer module, which is annular, and comprises a honeycomb structure, the honeycomb structure is arranged along the central axis direction of the annular damper, and the density of the honeycomb structure is determined according to the low-pass filtering threshold and the crush space required by the annular damper: ， wherein, is the modulus of elasticity of the material, is the moment of inertia of the cross section, is the constraint coefficient, is the bending length, is the mass of the system to be damped, is the impact acceleration of the system to be damped, is the honeycomb surface density of the honeycomb structure, is the envelope area of the honeycomb cross section, is the cross-sectional area of a standard honeycomb in the honeycomb sandwich. and a metal plate arranged at both ends of the buffer module and covering the end face of the honeycomb structure.

2. The ring damper of claim 1, wherein The honeycomb structure comprises hexagonal cells.

3. The ring damper of claim 2, wherein The cross-sectional area of the hexagonal cells With adjacent cell thickness Satisfies: ， wherein, A is the area of the hexagon circumscribed by the outer contour of the hexagonal cell, B is the area of the hexagon inscribed by the inner contour of the hexagonal cell, , a and b are the side lengths of the outer and inner contours of the hexagonal cell, respectively.

4. The ring damper of claim 3, wherein The side length of the inner contour of the hexagonal cell is 3.7-6 mm.

5. The ring damper of claim 3, wherein The thickness of adjacent cells of the honeycomb structure determined in accordance with a damping threshold required for the ring damper: 。 6. The ring damper of claim 3, wherein The thickness of adjacent cells of the honeycomb structure is 0.1-0.15 mm.

7. The ring damper of claim 1, wherein The material of the buffer module is a steel material; and / or The material of the metal plate is an aluminum alloy.

8. The ring damper of claim 1, wherein The metal plate is annular, and the metal plate is bonded to both ends of the buffer module.

9. A method of mounting a ring damper as claimed in any one of claims 1 to 8, characterised in that, Comprising steps: sleeving an annular damper on a boss of a main structure; and pressing one side of the annular damper using a static pressure process, wherein the pressure value used by the static pressure process is not greater than a specified energy threshold.

Images