A resettable energy-absorbing negative stiffness structure

Abstract

The utility model relates to a material technology field, concretely is a kind of reset's buffer energy-absorbing negative stiffness structure. Including: fixed part;Movable part, the upper end of fixed part is slidably arranged;First beam body, it is installed in the inside of fixed part, and with movable part transmission connection;Second beam body, it is installed in the inside of fixed part, and located below first beam body;Air bag, it is arranged between second beam body and fixed part, and with second beam body and fixed part fixed connection;Pressure regulating mechanism, with air bag intercommunication. First beam body and second beam body have bistable structure. In the state that first beam body and second beam body are bent along the same direction, the upper end surface of second beam body and the lower end surface of first beam body are contacted. It can effectively realize buffering and energy-absorbing when being impacted, and have multiple controllable working modes, can be flexibly adjusted and switched according to different working conditions and requirements.

Description

Technical Field

[0001] This utility model relates to the field of metamaterials technology, specifically a resettable buffer energy-absorbing negative stiffness structure. Background Technology

[0002] Negative stiffness structures are a class of structures that exhibit negative stiffness mechanical properties through artificial configuration design. Under compression, they can trigger multiple steady-state transitions and dissipate energy through transitions between steady states. Based on this characteristic, negative stiffness structures have significant potential in the field of buffering and energy absorption.

[0003] Currently, negative stiffness structures primarily rely on their negative stiffness effect to suppress reaction forces and utilize multi-steady-state transition processes to absorb impact energy. However, after absorbing energy in a single event, existing structures typically lack an active and controllable reset mechanism, making it difficult for them to automatically return to their initial configuration. This results in their inability to continuously perform their buffering function under multiple or repeated loads. This problem severely limits their application in practical engineering applications that require withstanding multiple impacts. Furthermore, most existing negative stiffness structures only possess a single, fixed operating mode and cannot dynamically adjust or adaptively switch according to external load conditions or actual performance requirements, further restricting their application flexibility and scope of applicability. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, this utility model provides a resettable buffer energy-absorbing negative stiffness structure, which can effectively achieve buffering and energy absorption when subjected to impact, and has multiple controllable working modes, which can be flexibly adjusted and switched according to different working conditions and needs.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A resettable, energy-absorbing, negative stiffness structure, comprising: Fasteners; The movable part is slidably mounted on the upper end of the fixed part; The first beam is installed inside the fixed component and is connected to the moving component via a transmission mechanism. The second beam is installed inside the fastener and is located below the first beam; An airbag is positioned between the second beam and the fixing member, and is fixedly connected to the second beam and the fixing member; The pressure regulating mechanism is connected to the airbag.

[0006] Furthermore, the first and second beams have bistable structures.

[0007] Furthermore, when the first beam and the second beam are bent in the same direction, the upper end face of the second beam contacts the lower end face of the first beam.

[0008] Furthermore, the fasteners include: The frame, the first beam, and the second beam are set inside the frame; Limiting holes are provided at the upper end of the frame; The active items include: The longitudinal plate is slidably inserted into the limiting hole, and the lower end of the longitudinal plate is connected to the upper end face of the first beam.

[0009] Furthermore, a connecting groove is provided on the inner side of the frame, and both ends of the first beam and the second beam are set in the connecting groove.

[0010] Furthermore, a horizontal plate is provided at the upper end of the longitudinal plate, and the horizontal plate is connected to the adjacent fastener.

[0011] Furthermore, the pressure regulating mechanism is a syringe, and a bypass valve is provided between the syringe and the air bladder.

[0012] The beneficial effects of this utility model are: (1) Under external load, the first beam and the second beam can transform between different steady-state configurations and exhibit significant negative stiffness characteristics. This helps to stably absorb impact energy, significantly suppress rebound, and thus avoid the generation of secondary impact.

[0013] (2) Through the double beam structure consisting of the first beam and the second beam, more energy can be absorbed within a unit deformation, which significantly improves the energy absorption efficiency and capacity of the overall structure.

[0014] (3) Driven by the airbag, the first beam and the second beam can recover to their initial configuration after the impact, so that the structure can continue to play a buffering role under multiple or repeated loads.

[0015] (4) According to the different state combinations of the first beam and the second beam, multiple working modes can be realized, and the structure can be adjusted and switched by airbag drive according to external load conditions or actual performance requirements, thereby improving the flexibility and applicability of the structure. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a structural schematic diagram of the present invention in its first use state; Figure 3 This is a structural schematic diagram of the present invention in its second usage state; Figure 4 This is a structural schematic diagram of the present invention in its third usage state; Figure 5This is a structural schematic diagram of the fastener in this utility model; Figure 6 This is a schematic diagram of the structure of the movable component in this utility model; Figure 7 This is a reference diagram of the physical state of this utility model.

[0018] In the picture: 1. Fixed component, 2. Moving component, 3. First beam, 4. Second beam, 5. Airbag, 6. Pressure regulating mechanism; 11. Frame; 12. Limiting hole; 13. Connecting groove; 21. Horizontal plate, 22. Vertical plate. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, a resettable, energy-absorbing negative stiffness structure includes a fixed member 1. A movable member 2 is slidably disposed on the upper end of the fixed member 1. A first beam 3 is installed inside the fixed member 1 and is drively connected to the movable member 2. A second beam 4 is installed inside the fixed member 1 and located below the first beam 3. An airbag 5 is disposed between the second beam 4 and the fixed member 1, with its upper and lower sides fixedly connected to the second beam 4 and the fixed member 1, respectively. A pressure regulating mechanism 6 communicates with the airbag 5 and is used to control the pressure and deformation of the airbag 5.

[0021] The first beam 3 and the second beam 4 need to adopt a bistable structure. Under external loads, the first beam 3 and the second beam 4 can transform between different steady-state configurations and exhibit significant negative stiffness characteristics. This helps to stably absorb impact energy, significantly suppress rebound, and thus avoid secondary impacts.

[0022] Furthermore, when the first beam 3 and the second beam 4 are bent in the same direction, the upper end face of the second beam 4 contacts the lower end face of the first beam 3, forming an integral curved beam structure. Through the double-beam structure composed of the first beam 3 and the second beam 4, more energy can be absorbed per unit deformation, significantly improving the overall energy absorption efficiency and capacity of the structure.

[0023] like Figure 5 As shown, the specific structure of the fastener 1 includes a frame 11, with a first beam 3 and a second beam 4 disposed within the frame 11. A connecting groove 13 is provided on the inner side of the frame 11, and both ends of the first beam 3 and the second beam 4 are disposed in the connecting groove 13. A limiting hole 12 is provided at the upper end of the frame 11.

[0024] like Figure 6As shown, the specific structure of the movable component 2 includes a longitudinal plate 22, which is slidably inserted into the limiting hole 12, and the lower end of the longitudinal plate 22 is connected to the upper end face of the first beam 3. A transverse plate 21 is provided at the upper end of the longitudinal plate 22, and the transverse plate 21 is connected to the adjacent fixing component 1. The fixing component 1 is connected to the adjacent fixing component 1. Thus, a periodically arranged overall structure is formed. The overall structure can be manufactured by 3D printing.

[0025] In a specific embodiment, the pressure regulating mechanism 6 can be a syringe, with a bypass valve provided between the syringe and the airbag 5. The syringe can adjust the air pressure and shape of the airbag 5, and the bypass valve can quickly depressurize the airbag 5, making its air pressure the same as the outside air pressure. Driven by the airbag 5, the first beam 3 and the second beam 4 can return to their initial configuration after the impact, allowing the structure to continue to play a buffering role under multiple or repeated loads.

[0026] Based on different state combinations of the first beam 3 and the second beam 4, multiple working modes can be realized, and adjustments and switching can be made by airbag 5 according to external load conditions or actual performance requirements, thereby improving the flexibility and applicability of the structure.

[0027] Specifically, such as Figure 2-4 As shown: exist Figure 2 In the first usage state shown, both the first beam 3 and the second beam 4 protrude upwards, forming a positive stiffness structure. At this time, the pressure regulating mechanism 6 makes the internal air pressure of the airbag 5 the same as the external pressure, and the airbag does not exert any additional force on the first beam 3 and the second beam 4. Through the double beam structure formed by the first beam 3 and the second beam 4, more energy can be absorbed per unit deformation, making it suitable for applications involving buffering and energy absorption under high pressure.

[0028] As the pressure on the moving part 2 gradually increases, the first beam 3 and the second beam 4 will go from an upward convex state through a negative stiffness state, and finally enter the second use state.

[0029] exist Figure 3 In the second usage state shown, both the first beam 3 and the second beam 4 bulge downwards, forming a positive stiffness structure again. At this time, the pressure regulating mechanism 6 maintains the same air pressure in the airbag 5 as the external environment, and the airbag exerts no additional force on the first beam 3 and the second beam 4. The double-beam structure formed by the first beam 3 and the second beam 4 can absorb more energy per unit deformation, making it suitable for applications requiring buffering and energy absorption under high pressure.

[0030] If the airbag 5 is inflated by the pressure regulating mechanism 6 in the second use state, the first beam 3 and the second beam 4 can be driven to change from downward protrusion to upward protrusion and return to the initial first use state.

[0031] If, in the first usage state, a negative pressure is created inside the airbag 5 by the pressure regulating mechanism 6, the airbag 5 will contract and drive the second beam 4 to bulge downwards on its own, thus entering the third usage state.

[0032] exist Figure 4 In the third operating state shown, only the first beam 3 maintains its upward convex shape. Compared to the convex structure composed of two beams, the first beam 3 can switch between different steady states with less pressure applied by the moving part 2, resulting in higher response accuracy. Therefore, it is suitable for applications requiring buffering and energy absorption under low pressure.

[0033] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A resettable, energy-absorbing, negative stiffness structure, characterized in that, include: Fastener (1); The movable part (2) is slidably disposed on the upper end of the fixed part (1); The first beam (3) is installed inside the fixed part (1) and is connected to the movable part (2) in a transmission manner; The second beam (4) is installed inside the fixing member (1) and located below the first beam (3); An airbag (5) is disposed between the second beam (4) and the fixing member (1) and is fixedly connected to the second beam (4) and the fixing member (1); The pressure regulating mechanism (6) is connected to the airbag (5).

2. The resettable buffer energy-absorbing negative stiffness structure according to claim 1, characterized in that, The first beam (3) and the second beam (4) have a bistable structure.

3. The resettable buffer energy-absorbing negative stiffness structure according to claim 2, characterized in that, When the first beam (3) and the second beam (4) are bent in the same direction, the upper end face of the second beam (4) is in contact with the lower end face of the first beam (3).

4. The resettable buffer energy-absorbing negative stiffness structure according to claim 1, characterized in that, The fastener (1) includes: The frame (11), the first beam (3), and the second beam (4) are disposed within the frame (11); A limiting hole (12) is provided at the upper end of the frame (11); The movable component (2) includes: The longitudinal plate (22) is slidably inserted into the limiting hole (12), and the lower end of the longitudinal plate (22) is connected to the upper end face of the first beam (3).

5. A resettable buffer energy-absorbing negative stiffness structure according to claim 4, characterized in that, The inner side of the frame (11) is provided with a connecting groove (13), and both ends of the first beam (3) and the second beam (4) are provided in the connecting groove (13).

6. The resettable buffer energy-absorbing negative stiffness structure according to claim 4, characterized in that, A horizontal plate (21) is provided at the upper end of the longitudinal plate (22), and the horizontal plate (21) is connected to the adjacent fastener (1).

7. The resettable buffer energy-absorbing negative stiffness structure according to claim 1, characterized in that, The pressure regulating mechanism (6) is a syringe, and a bypass valve is provided between the syringe and the air bag (5).

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