Reusable quasi-zero stiffness buffer energy absorption structure
By designing a reusable quasi-zero stiffness buffering energy-absorbing structure, the problem of the inability to isolate vibration and impact loads simultaneously in the prior art is solved, and efficient energy absorption and lightweight buffering effects are achieved, which are suitable for buffering and vibration reduction of aerospace aircraft.
Patent Information
- Application Number
- CN202510394454.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2025-07-18
AI Technical Summary
The existing buffer energy-absorbing device cannot isolate vibration and impact loads simultaneously, and cannot be reused, which cannot meet the high-efficiency energy-absorbing and lightweight design requirements of mechanical protection.
A reusable quasi-zero stiffness buffer energy-absorbing structure is designed, including a beam group composed of a base, a column, an inclined beam and a vertical beam. The base does not deform, and the beam group provides positive stiffness. It is made by 3D printing to achieve the quasi-zero stiffness and reusable performance of the structure.
It realizes effective buffering of vibration and impact loads, has quasi-zero stiffness performance, can be reused, and provides better energy absorption effect and structural stability.
Smart Images
Figure CN120332382A_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of aerospace equipment. Specifically, it relates to a reusable quasi-zero stiffness buffer and energy absorption structure suitable for satellites. Background Art
[0002] Impact and vibration loads widely exist in engineering fields such as rail transit, automobile transportation, aerospace, and ships. These impact loads pose significant risks to the accuracy, service life, and safety of instruments. Due to the increasing demand for mechanical protection, designing innovative buffer structures to achieve efficient energy absorption performance while having a lightweight design has always been a research hotspot in the fields of advanced engineering and applied science. Existing buffer and energy absorption devices mainly rely on friction and plastic strain to absorb energy, cannot be reused, and cannot isolate both buffer and vibration loads simultaneously. Summary of the Invention
[0003] This application provides a reusable quasi-zero stiffness buffer and energy absorption structure that can be reused and is effective for both vibration and impact loads simultaneously, providing effective buffering for aerospace vehicles.
[0004] Among them, the reusable quasi-zero stiffness buffer and energy absorption structure includes several units, and each unit includes:
[0005] A base that does not deform during the loading process of the quasi-zero stiffness buffer and energy absorption structure.
[0006] A column whose length direction is consistent with the load direction.
[0007] A beam group including more than 2 parallel inclined beams, with more than 2 vertical beams arranged between the inclined beams. The length direction of the vertical beams is consistent with the length direction of the column. The first end of the inclined beam is connected to the base, and the second end of the inclined beam is connected to the column. When the first unit is placed in the first direction, the first end of the inclined beam is higher than its second end. The beam group is symmetrically arranged around the column center.
[0008] A platform connected to one end of the column close to the first direction.
[0009] In one embodiment, the units are connected through the base or the platform.
[0010] In one embodiment, the vertical beams are located between the column and the base.
[0011] In one embodiment, the quasi-zero stiffness buffer and energy absorption structure includes:
[0012] Row unit, a plurality of the units connected horizontally in the same direction constitute the row unit;
[0013] Among them, the horizontal direction is perpendicular to the first direction.
[0014] In one embodiment, the quasi-zero stiffness buffer and energy absorption structure includes:
[0015] Surface unit, a plurality of the row units connected in the first direction, and the directions of adjacent row units are different.
[0016] In one embodiment, the quasi-zero stiffness buffer and energy absorption structure includes a plurality of the surface units connected longitudinally;
[0017] Among them, the longitudinal direction, the horizontal direction, and the first direction are perpendicular to each other.
[0018] In one embodiment, the number of beam groups in the unit is 2.
[0019] In one embodiment, the base is a U-shaped groove, the second end of the inclined beam is connected to the inner wall of the U-shaped groove, and the platform is located in the direction of the notch of the U-shaped groove.
[0020] In one embodiment, it is made by 3D printing.
[0021] This application also provides a landing device for a spacecraft, including the above-mentioned quasi-zero stiffness buffer and energy absorption structure.
[0022] In the reusable quasi-zero stiffness buffer and energy absorption structure provided by this application, the beam group includes two or more inclined beams parallel to each other, and two or more vertical beams are arranged between the inclined beams. The length direction of the vertical beams is the same as the length direction of the column; the first end of the inclined beam is connected to the base, the second end of the inclined beam is connected to the first straight beam, and when the first unit is placed in the first direction, the first end of the inclined beam is higher than its second end; the beam group is symmetrically arranged around the column center to achieve the quasi-zero stiffness of the unit. In the quasi-zero stiffness buffer and energy absorption structure provided by this application, the vertical beams in the beam group of the unit provide positive stiffness. During the loading process of the quasi-zero stiffness buffer and energy absorption structure, the base does not deform. The quasi-zero stiffness buffer and energy absorption structure composed of one or several of the units has quasi-zero stiffness performance and buffer reusable performance.
[0023] To further clarify, the aspects and advantages of the embodiments disclosed in this application will become apparent in the following description section, or be understood through the practice of the embodiments disclosed in this application. Brief Description of the Drawings
[0024] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.
[0025] Figure 1 It is a schematic structural diagram of the unit in the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application;
[0026] Figure 2 It is a schematic diagram of the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application;
[0027] Figure 3 It is a force-displacement curve diagram obtained for the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application;
[0028] Figure 4 It is a force-displacement curve diagram obtained from the quasi-static compression-unloading test of the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application;
[0029] Figure 5 It is a comparison diagram of the force-displacement curves of the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application under repeated buffering and Figure 8 the structure shown;
[0030] Figure 6 It is a result curve diagram of the reusable quasi-zero stiffness buffer energy absorption structure in Embodiment 1 of the present application under repeated impact tests on a drop hammer impact test bench;
[0031] Figure 7 It is a state diagram of the deformation process of the reusable quasi-zero stiffness buffer energy absorption structure in Embodiment 1 of the present application during two repeated impacts;
[0032] Figure 8 It is a buffer structure in the prior art;
[0033] Figure 9 It is a comparison diagram of the acceleration curves of the hammer head when the hammer head of the drop hammer impact test bench falls on the reusable quasi-zero stiffness buffer energy absorption structure provided in Embodiment 1 of the present application and the Figure 8 structure shown with the same size;
[0034] Figure 10 The solid line in Figure 1 shows the stiffness characteristic curve exhibited by the unit shown under the same test conditions in computer simulation. Specific Embodiments
[0035] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.
[0036] Embodiment 1
[0037] This embodiment provides a reusable quasi-zero stiffness buffer energy absorption structure, which includes a number of units 100. Refer to Figure 1 , the unit 100 includes:
[0038] A base 7, which does not deform during the loading process of the quasi-zero stiffness buffer energy absorption structure.
[0039] A column 6, the length direction of the column 6 is consistent with the load direction, Figure 1 wherein the direction of the load and the length direction of the column 6 are both in the vertical direction;
[0040] A beam group, including an upper inclined beam 5 and a lower inclined beam 4 that are parallel to each other. A first vertical beam 2 and a second vertical beam 3 are arranged between the upper inclined beam 5 and the lower inclined beam 4. The length directions of the first vertical beam 2 and the second vertical beam 3 are consistent with the length direction of the column 6, and in Figure 1 both are in the vertical direction; the first ends of the upper inclined beam 5 and the lower inclined beam 4 are both connected to the base 7, and the second ends of the upper inclined beam 5 and the lower inclined beam 4 are both connected to the column 6. And when the first unit 100 is placed in the first direction, the first ends of the upper inclined beam 5 and the lower inclined beam 4 are both higher than their respective second ends; the beam group is symmetrically arranged around the center of the column 6;
[0041] A platform 1, connected to one end of the column 6 close to the first direction.
[0042] In this embodiment, the first direction is Figure 1 the vertically upward direction in , and being close to the first direction means being higher in the vertical direction.
[0043] In this embodiment, the column 6 and the base 7 are used for the connection between the beam groups and provide support for the beam groups. During the working process such as receiving impact loads, the column 6 and the base 7 do not deform. In the quasi-zero stiffness buffer energy absorption structure provided in this embodiment, the first vertical beam 2 and the second vertical beam 3 in the beam group of the unit provide positive stiffness. During the loading process of the quasi-zero stiffness buffer energy absorption structure, the base does not deform. Based on the support of the vertical beams and the base, the quasi-zero stiffness buffer energy absorption structure composed of one or several of the units has quasi-zero stiffness performance and buffer reuse performance.
[0044] This embodiment provides a connection method for the unit 100 in the quasi-zero stiffness buffer energy absorption structure: Refer to Figure 2, the units 100 are connected by the base 7 or the platform 1, and the base 7 or the platform 1 does not deform during the loading process and serves as the framework in the quasi-zero stiffness buffer energy absorption structure formed by combining multiple units 100.
[0045] In this embodiment, a first vertical beam 2 and a second vertical beam 3 in the unit 100 of the quasi-zero stiffness buffer energy absorption structure are both located between the column 6 and the base 7, providing positive stiffness while endowing the structure with the ability to repeatedly bear impact loads.
[0046] This embodiment provides a quasi-zero stiffness buffer energy absorption structure, referring to Figure 2 , including:
[0047] The first row of units 101, which is composed of a plurality of vertically upward units 100 connected horizontally; and / or,
[0048] The second row of units 102, which is composed of a plurality of vertically downward units 100 connected horizontally;
[0049] Wherein, the horizontal direction is perpendicular to the first direction.
[0050] The horizontal arrangement can, on the one hand, provide a larger platform as the impact surface facing the load, and on the other hand, can provide reliable support for the beam group in the horizontal direction.
[0051] Furthermore, this embodiment provides a quasi-zero stiffness buffer energy absorption structure, including:
[0052] The surface unit 103, referring to Figure 2 , a plurality of the first row of units 101 and the second row of units 102 connected in the first direction, with the first row of units 101 and the second row of units 102 spaced apart from each other, endowing the quasi-zero stiffness buffer energy absorption structure with better energy absorption ability and repeatability.
[0053] Furthermore, this embodiment provides a quasi-zero stiffness buffer energy absorption structure, including a plurality of the surface units 103 connected longitudinally;
[0054] Wherein, the longitudinal direction ( Figure 2 the arrow direction in), the horizontal direction and the first direction are perpendicular to each other.
[0055] For Figure 2 the provided quasi-zero stiffness buffer energy absorption structure, tests are carried out under quasi-static compression and dynamic impact loads to verify its quasi-zero stiffness performance and buffer reuse performance. When the structure is under quasi-static compression loading, the force-displacement curve is as Figure 3 shown, Figure 3In the compression range where the mid - displacement is from 0 to 5 mm, the structural reaction force increases as the displacement increases, showing the characteristic of positive stiffness. In the range of 5 mm - 15 mm, the structural reaction force does not change with the increase of displacement and remains near 170 N, showing the characteristic of quasi - zero stiffness. As the loading displacement increases, when the loading displacement exceeds 15 mm, the reaction force increases as the displacement increases, showing the characteristic of positive stiffness, verifying that the structure provided in this example has quasi - zero stiffness performance. And Figure 2 The structure shown exhibits quasi - zero stiffness within a stroke of about 10 mm (in the range of 5 mm - 15 mm), accounting for nearly 50% of the total stroke. Due to the errors in the machining process of the structure, the range of the quasi - zero stiffness characteristic fluctuates somewhat. Figure 10 The solid line in Figure 1 shows the stiffness characteristic curve of the unit shown under the same test conditions of computer simulation. The line segment within the rectangular wireframe in the figure is the part where the unit shows quasi - zero stiffness characteristics, accounting for about 50% of the total stroke. Compared with the existing structure, the stroke with quasi - zero stiffness characteristics accounting for about 50% of the total stroke is longer.
[0056] The force - displacement curve obtained from the quasi - static compression and unloading test of the structure is as Figure 4 shown Figure 4 The curve shows the loading process and unloading process of the structure provided in this embodiment. The upward arrow direction is the loading curve. After loading until the structure tends to be densified, unloading starts, and the downward arrow is the unloading curve. After the unloading is completed, the overall deformation of the structure is only 1.5 mm, almost showing a return to the original shape, verifying the buffer and reusable performance of the structure provided in this example.
[0057] To verify that the quasi - zero stiffness buffer and energy - absorbing structure provided in this embodiment has significant progress, a comparison is made with the Figure 8 shown buffer structure. The comparison of the force - displacement curves of the two is as Figure 5 shown, where the blue curve is the curve of the structure provided in this embodiment, and the red curve is the curve of the Figure 8 shown buffer structure. It can be seen that the quasi - zero stiffness buffer and energy - absorbing structure provided in this embodiment can achieve better energy absorption effect
[0058] To further verify the ability of the quasi - zero stiffness buffer and energy - absorbing structure provided in this embodiment to cope with repeated impacts, the quasi - zero stiffness buffer and energy - absorbing structure provided in this embodiment is placed on a drop - hammer impact test bench. A 6.5 kg hammer head is dropped from a height of 50 mm and repeated 2 times. The test result curve is as Figure 6The curve shown in the figure is the measurement result of the acceleration sensor on the hammer head of the drop hammer impact test bench. The acceleration change curves generated by the two tests basically overlap, indicating that the quasi-zero stiffness buffer energy absorption structure in this embodiment can cope with repeated impacts. The deformation of the quasi-zero stiffness buffer energy absorption structure in the two impacts is shown in FIG. Figure 7 As shown, Figure 7 It shows that the deformation degree of the quasi-zero stiffness buffer energy absorbing structure is almost the same.
[0059] Furthermore, for the same size as the structure implemented in this case Figure 8 The buffer structure shown in the figure is subjected to the same impact test (same hammer weight and same hammer drop) and acceleration comparison is performed. Figure 9 As shown, the blue one is the curve of the structure provided in this embodiment, and the red one is Figure 8 Curve of the buffer structure shown. Figure 9 It is proved that, under the same size, the buffering effect of the structure in this embodiment is better.
[0060] In this embodiment, the surface units 103 may be arranged in parallel or vertically, or at angles of other sizes.
[0061] In this embodiment, refer to Figure 1 The base 7 is a U-shaped groove, the second end of the inclined beam is connected to the inner wall of the U-shaped groove, and the platform is located in the notch direction of the U-shaped groove.
[0062] In one implementation, the quasi-zero stiffness buffer energy absorption structure provided in this embodiment is manufactured by 3D printing, which can avoid errors caused by mechanical processing as much as possible.
[0063] This embodiment also provides a landing device for a spacecraft, including the quasi-zero stiffness buffer energy absorption structure described above, to mitigate the impact of landing.
[0064] The quasi-zero stiffness buffering energy absorption structure provided in this embodiment can be connected to a precision instrument by gluing, so that the precision instrument is isolated from the vibration source and the impact source, thereby achieving buffering. It can also be used for protection against pyrotechnic impact when a spacecraft is separated. It can also be used in the field of transportation, and installed under the seat of a vehicle to achieve buffering and vibration reduction.
[0065] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the technical solution and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the technical solution of this application.
[0066] In the technical solution of this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the technical solution of this application can be understood according to specific circumstances.
[0067] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the technical solution of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.
[0068] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation to this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
Claims
1. A reusable quasi-zero stiffness buffer energy absorption structure, characterized in that, comprises a number of units, each unit comprising: a base which does not deform during the loading process of the quasi-zero stiffness buffer energy absorption structure; a column, the length direction of the column being consistent with the load direction; a beam group comprising more than 2 mutually parallel inclined beams, with more than 2 vertical beams arranged between the inclined beams, the length direction of the vertical beams being consistent with the length direction of the column; the first end of the inclined beam is connected to the base, the second end of the inclined beam is connected to the column, and when the first unit is placed in the first direction, the first end of the inclined beam is higher than its second end; the beam group is arranged symmetrically about the column center; a platform connected to one end of the column close to the first direction.
2. The quasi-zero stiffness buffer energy absorption structure according to claim 1, wherein The units are connected through the base or the platform.
3. The quasi-zero stiffness buffer and energy absorption structure according to claim 1, wherein The vertical beam is located between the column and the base.
4. The quasi-zero stiffness buffer energy absorption structure according to claim 1, characterized in that, comprises: a row unit, which is composed of a number of the units connected horizontally in the same direction; wherein the horizontal direction is perpendicular to the first direction.
5. The quasi-zero stiffness buffer energy absorption structure according to claim 4, characterized in that comprises: a surface unit, which is composed of a number of the row units connected in the first direction, and the directions of adjacent row units are different.
6. The quasi-zero stiffness buffer energy absorption structure according to claim 5, characterized in that comprises a number of the surface units connected longitudinally; wherein the longitudinal direction, the horizontal direction and the first direction are perpendicular to each other.
7. The quasi-zero stiffness buffer energy absorption structure according to claim 1, characterized in that The number of beam groups in the unit is 2.
8. The quasi-zero stiffness buffer energy absorption structure according to claim 1, characterized in that The base is a U-shaped groove, the second end of the inclined beam is connected to the inner wall of the U-shaped groove, and the platform is located in the direction of the notch of the U-shaped groove.
9. The quasi-zero stiffness buffer energy absorption structure according to claim 1, wherein Made by 3D printing.
10. The landing gear of a spacecraft, characterized in that, comprises the quasi-zero stiffness buffer energy absorption structure according to any one of claims 1 to 9.