An energy-absorbing damping unit, an energy-absorbing damping mechanism and a drone

Abstract

The application discloses an energy-absorbing damping unit, an energy-absorbing damping mechanism and a UAV, wherein the energy-absorbing damping unit comprises a hexagonal honeycomb structure and an inner recess structure; the hexagonal honeycomb structure comprises first and second mutually parallel compression plate bodies, and the inner recess structure comprises connecting ribs and hollow inner recess monomers; the two ends of the inner recess structure are connected with the inner side walls of the hexagonal honeycomb structure through the connecting ribs respectively; the inner recess monomers are used as embedded oscillators; the inner recess monomers comprise inner recess plates connected with the connecting ribs, the inner recess plates are divided into a first part close to the first compression plate body and a second part close to the second compression plate body by the center lines of the corresponding connecting ribs, and the inner side walls of the first part and the second part are provided with stop blocks; the energy-absorbing damping unit has first and second deformation stages. The hexagonal honeycomb structure is embedded in the inner recess structure in a combined arrangement form, and the functional requirements of energy absorption and vibration reduction can be met simultaneously.

Description

Technical Field

[0001] This invention relates to the field of energy absorption and protection, specifically to an energy absorption and vibration reduction unit, an energy absorption and vibration reduction mechanism, and a drone. Background Technology

[0002] In practical engineering applications, energy absorption and vibration isolation performance are important performance requirements that must be considered simultaneously in the structural design of unmanned aerial vehicles (UAVs). Taking UAVs as an example, during use, they may generate significant impact energy due to high-altitude falls or accidental collisions, requiring the structure to have a certain energy absorption and buffering capacity to protect core components such as batteries and electronic controls. At the same time, under normal flight conditions, the periodic vibrations generated by the power system will also act on the airframe structure, which need to be suppressed through appropriate vibration reduction or isolation measures to ensure flight stability and safety.

[0003] In current engineering designs, the two types of performance requirements mentioned above are usually achieved through different structures or components. Existing research and engineering solutions mostly focus on optimizing a single function, such as emphasizing the enhancement of the structure's impact energy absorption capacity, while vibration suppression is achieved through additional vibration reduction or isolation components. This type of design often satisfies multiple performance requirements by stacking functional components, which can easily lead to structural complexity, increased mass, and a certain degree of structural redundancy.

[0004] Since the energy absorption and vibration isolation functions are distributed in different structures, the existing solutions cannot meet the protection and vibration control requirements while taking into account the overall lightweight design goal of the structure. This is contrary to the current trend of UAV structure development towards lightweight and high integration. Summary of the Invention

[0005] To address the above-mentioned problems and overcome at least one deficiency, this invention proposes an energy-absorbing vibration damping unit, an energy-absorbing vibration damping mechanism, and a drone.

[0006] The technical solution adopted in this invention is as follows:

[0007] An energy-absorbing and vibration-damping unit includes a hexagonal honeycomb structure and a concave structure disposed within the hexagonal honeycomb structure; The hexagonal honeycomb structure includes three pairs of parallel plates, one of which is a first pressure plate and the other is a second pressure plate. The concave structure is located in the middle region of the first pressure plate and the second pressure plate. The concave structure includes connecting ribs and hollow concave single units. The two ends of the concave structure are connected to the inner sidewall of the hexagonal honeycomb structure through connecting ribs. The concave single unit is used as an embedded oscillator, which can generate opposite phase motion under the action of external vibration excitation, consume vibration energy, and realize vibration absorption. The concave single unit includes a concave plate connected to the connecting rib. The concave plate forms a first part close to the first pressure plate and a second part close to the second pressure plate with the center line of the corresponding connecting rib as the boundary. The inner sidewall of the first part and the inner sidewall of the second part both have blocks. The energy-absorbing and vibration-damping unit has a first deformation stage and a second deformation stage; During the first deformation stage, the first and second pressure plates of the energy-absorbing and vibration-damping unit are compressed, and the hexagonal honeycomb structure deforms. The connecting ribs drive the inner concave unit to deform, causing the inner concave plate to deform in a flattening trend. The two blocks on the inner concave plate move closer to each other until they contact each other. When the two blocks contact each other, the stiffness of the inner concave unit increases. During the second deformation stage, the two blocks on the concave plate of the energy-absorbing and vibration-damping unit come into contact with each other, the first and second pressure plates are compressed, the hexagonal honeycomb structure continues to deform, and comes into contact with the concave single unit, causing the concave single unit to collapse and deform.

[0008] This application employs a combination arrangement of a hexagonal honeycomb structure embedded with a concave structure, which simultaneously meets the functional requirements of energy absorption and vibration reduction. On one hand, the two ends of the concave structure are connected to the inner wall of the hexagonal honeycomb structure via connecting ribs; the concave unit acts as an embedded oscillator, capable of generating opposite-phase motion under external vibration excitation, consuming vibration energy and achieving vibration absorption. On the other hand, by setting the concave structure, the energy-absorbing and vibration-damping unit can have two deformation stages. The coordinated deformation of the hexagonal honeycomb structure and the concave structure causes the whole to exhibit multi-level mechanical behavior during loading, thus possessing higher impact resistance. Furthermore, by setting baffles, this application can effectively increase the stiffness of the concave unit after the two baffles contact, thereby enabling the energy-absorbing and vibration-damping unit to form a second-stage deformation with even higher stiffness, which can improve the overall impact resistance.

[0009] In practical applications, the vibration reduction frequency band can be controlled by adjusting the structural form and / or mass of the concave unit during the design phase, enabling this application to have the capability for customized design of energy absorption and vibration reduction performance.

[0010] The deformation of the energy-absorbing and vibration-damping unit of this application is described in detail below under quasi-static loading conditions: Under pressure from both the first and second compression plates, the hexagonal honeycomb structure undergoes primarily bending deformation. The first and second compression plates move closer together, and the central portion of the hexagonal honeycomb structure deforms outwards (the central endpoint expands outwards). At this point, the connecting ribs cause tensile deformation in the concave individual units, forming the first stage of deformation, until the two blocks on the concave plate contact each other. When the two blocks on the concave plate contact each other, the displacement of the concave plate is restricted under the action of the two blocks, allowing for the formation of a more rigid structure (such as a rectangular frame structure). As the compressive displacement is further applied, the hexagonal honeycomb structure contacts the concave individual units, and the stiffness of the entire structure significantly increases, entering the second stage of deformation.

[0011] In one embodiment of the present invention, there are multiple concave monomers, and adjacent concave monomers are connected by connecting ribs.

[0012] In one embodiment of the present invention, the concave single unit has two symmetrically arranged concave plates; The concave unit includes two parallel and oppositely arranged flat plates, which are parallel to the first pressure plate. When the concave plate deforms and the two blocks just come into contact, the concave unit has a rectangular frame structure.

[0013] In one embodiment of the present invention, an intersection angle is formed at the junction of two adjacent plates. Among the six intersection angles of the hexagonal honeycomb structure, the two intersection angles located between the first pressure plate and the second pressure plate are the middle intersection angles. The two ends of the concave structure are connected to the two intermediate intersection corners by connecting ribs.

[0014] In one embodiment of the present invention, the stop has a contact surface for contacting and engaging with the contact surface of another stop. When the first pressure plate is in a horizontal state, the angle between the contact surface and the horizontal plane is θ1, and the angle between the first part or the second part and the vertical plane is θ2, where θ1 is greater than or equal to θ2.

[0015] θ1 is greater than or equal to θ2, which is used to ensure that a rectangular frame structure can be formed during the compression process, so as to smoothly enter the second stage of deformation.

[0016] In one embodiment of the present invention, θ1 is equal to θ2.

[0017] In one embodiment of the present invention, the stop block has a hollow hole.

[0018] The hollowed-out design allows the block itself to deform, enabling it to absorb some energy as it is further loaded with compression displacement.

[0019] In this application, the stop block can be of various shapes, such as triangular blocks, rectangular blocks, etc. The essential function of the stop block is to restrict the tensile deformation of the concave single unit, so that the concave structure can form a second-stage deformation with greater stiffness during the loading process.

[0020] In practical applications, the energy-absorbing and vibration-damping unit of this application can adopt the energy-absorbing materials used in the field of drones. In one embodiment of the present invention, the material of the energy-absorbing and vibration-damping unit is nylon polymer.

[0021] This application also discloses an energy-absorbing and vibration-damping mechanism, including a base plate and a plurality of energy-absorbing and vibration-damping units as described above, wherein the first pressure plate of the energy-absorbing and vibration-damping unit is fixed on the base plate.

[0022] In practical applications, it is preferable that the energy-absorbing and vibration-damping units are arranged in an array on the base plate.

[0023] In practical applications, the base plate can be made of nylon polymer.

[0024] In practical applications, the base plate and the energy-absorbing and vibration-damping unit can be integrally formed by 3D printing, and then the energy-absorbing and vibration-damping unit can be fixed to the base plate by bonding or other methods.

[0025] This application also discloses a drone, including the energy-absorbing and vibration-damping mechanism described above.

[0026] The beneficial effects of this invention are as follows: This application adopts a combination arrangement of hexagonal honeycomb structure embedded with concave structure, which can simultaneously meet the functional requirements of energy absorption and vibration reduction. On the one hand, the two ends of the concave structure are connected to the inner sidewall of the hexagonal honeycomb structure through connecting ribs; the concave unit is used as an embedded oscillator, which can generate opposite phase motion under the action of external vibration excitation, consume vibration energy, and realize vibration absorption; on the other hand, by setting the concave structure, the energy absorption and vibration reduction unit can have two deformation stages, that is, the coordinated deformation of the hexagonal honeycomb structure and the concave structure makes the whole exhibit multi-level mechanical behavior during the loading process, thereby having a higher impact resistance. In addition, by setting the baffle, this application can effectively improve the stiffness of the concave unit after the two baffles come into contact, so that the energy absorption and vibration reduction unit can form a second stage deformation with higher stiffness, which can improve the overall impact resistance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an energy-absorbing and vibration-damping mechanism; Figure 2 This is a schematic diagram of an energy-absorbing and vibration-damping unit; Figure 3 This is a schematic diagram of the concave structure; Figure 4 It is the force-displacement curve of the energy-absorbing and vibration-damping unit; Figure 5 It shows the frequency response curves of the energy-absorbing and vibration-damping unit and the traditional honeycomb structure.

[0028] The labels for the attached figures are as follows: 100. Energy-absorbing and vibration-damping unit; 1. Hexagonal honeycomb structure; 11. First pressure plate; 12. Second pressure plate; 13. Intermediate junction corner; 2. Concave structure; 21. Connecting rib; 22. Concave unit; 221. Concave plate; 2211. First part; 2212. Second part; 2213. Stop block; 22131. Contact surface; 22132. Hole; 222. Flat plate; 200. Base plate. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 As shown, an energy-absorbing and vibration-damping mechanism includes a base plate 200 and a plurality of energy-absorbing and vibration-damping units 100 fixed on the base plate 200. The energy-absorbing and vibration-damping units 100 are used to absorb impact energy and vibration energy.

[0034] like Figure 1As shown, in one embodiment, the energy-absorbing and vibration-damping units 100 are arranged in an array on the base plate 200.

[0035] like Figure 2 and 3 As shown, the energy-absorbing and vibration-damping unit 100 includes a hexagonal honeycomb structure 1 and a concave structure 2 disposed within the hexagonal honeycomb structure 1. The hexagonal honeycomb structure 1 includes three pairs of parallel plates, one of which is a first pressure plate 11 and a second pressure plate 12. The concave structure 2 is located in the middle region of the first pressure plate 11 and the second pressure plate 12. The concave structure 2 includes a connecting rib 21 and a hollow concave single unit 22. The two ends of the concave structure 2 are connected to the inner sidewall of the hexagonal honeycomb structure 1 through the connecting rib 21. The concave single unit 22 is used as an embedded oscillator, which can generate opposite phase motion under the action of external vibration excitation, consume vibration energy, and realize vibration absorption. The concave unit 22 includes a concave plate 221 connected to the connecting rib 21. The concave plate 221 forms a first part 2211 near the first pressure plate 11 and a second part 2212 near the second pressure plate 12 with the center line of the corresponding connecting rib 21 as the boundary. The inner sidewall of the first part 2211 and the inner sidewall of the second part 2212 both have a stop block 2213. The energy-absorbing and vibration-damping unit 100 has a first deformation stage and a second deformation stage; During the first deformation stage, the first pressure plate 11 and the second pressure plate 12 are compressed, and the hexagonal honeycomb structure 1 deforms. The connecting ribs 21 drive the inner concave single unit 22 to deform, causing the inner concave plate 221 to deform in a flattening trend. The two blocks 2213 on the inner concave plate 221 move closer to each other until they contact each other. When the two blocks 2213 contact each other, the stiffness of the inner concave single unit 22 increases. During the second deformation stage, the two blocks 2213 on the concave plate 221 of the energy-absorbing and vibration-damping unit 100 come into contact with each other, the first pressure plate 11 and the second pressure plate 12 are compressed, the hexagonal honeycomb structure 1 continues to deform, and comes into contact with the concave single unit 22, causing the concave single unit 22 to collapse and deform.

[0036] This application adopts a combination arrangement of hexagonal honeycomb structure 1 embedded with concave structure 2, which can simultaneously meet the functional requirements of energy absorption and vibration reduction. On the one hand, the two ends of the concave structure 2 are connected to the inner sidewall of the hexagonal honeycomb structure 1 through connecting ribs 21; the concave unit 22 is used as an embedded oscillator, which can generate opposite phase motion under the action of external vibration excitation, consume vibration energy, and realize vibration absorption; on the other hand, by setting the concave structure 2, the energy absorption and vibration reduction unit 100 can have two deformation stages, that is, the coordinated deformation of the hexagonal honeycomb structure 1 and the concave structure 2 makes the whole exhibit multi-level mechanical behavior during the loading process, thereby having a higher impact resistance. In addition, by setting the baffle 2213, the stiffness of the concave unit 22 can be effectively improved after the two baffles 2213 come into contact, so that the energy absorption and vibration reduction unit 100 can form a second stage deformation with higher stiffness, which can improve the overall impact resistance.

[0037] In practical applications, the vibration reduction frequency band can be controlled by adjusting the structural form and / or mass of the concave unit 22 during the design phase, enabling this application to have the capability for customized design of energy absorption and vibration reduction performance.

[0038] The deformation of the energy-absorbing and vibration-damping unit 100 under quasi-static loading conditions is described in detail below: The first pressure plate 11 and the second pressure plate 12 are under pressure. The hexagonal honeycomb structure 1 undergoes bending deformation as the primary process. The first pressure plate 11 and the second pressure plate 12 move closer to each other, and the middle part of the hexagonal honeycomb structure 1 deforms outward (the middle endpoint expands outward). At this time, the concave single unit 22 is driven to undergo tensile deformation through the connecting rib 21, forming the first stage of deformation, until the two stops 2213 on the concave plate 221 come into contact with each other. When the two stops 2213 on the concave plate 221 come into contact with each other, the displacement of the concave plate 221 is restricted under the action of the two stops 2213, which can form a structure with greater rigidity (such as forming a rectangular frame structure). As the compression displacement is further loaded, the hexagonal honeycomb structure 1 comes into contact with the concave single unit 22, and the stiffness of the entire structure is significantly improved, entering the second stage of deformation.

[0039] like Figure 4 As shown, the complete force-displacement curve under quasi-static loading conditions exhibits obvious multi-level mechanical behavior characteristics: the first stage corresponds to a smaller force value and a larger displacement range, while the second stage corresponds to a larger force value and a smaller displacement range. This enables the energy-absorbing and vibration-damping unit 100 to effectively cope with different impact conditions.

[0040] like Figure 5The figure shows the frequency response curves of the energy absorption and vibration reduction unit 100 of this application and the traditional honeycomb structure. As can be seen from the figure, compared with the traditional hexagonal honeycomb structure 1, by introducing the concave structure 2 and using the concave structure 2 as the anti-phase vibration effect of the internal oscillator, the vibration can be effectively suppressed, so that the energy absorption and vibration reduction unit 100 exhibits better vibration reduction performance.

[0041] like Figure 2 and 3 As shown, in one embodiment, the first part 2211 and the second part 2212 are two plate-like structures that intersect at an angle.

[0042] like Figure 2 and 3 As shown, in one embodiment, there are multiple concave monomers 22, and adjacent concave monomers 22 are connected by connecting ribs 21.

[0043] like Figure 2 and 3 As shown, in one embodiment, the concave single unit 22 has two symmetrically arranged concave plates 221; The concave unit 22 includes two parallel and oppositely arranged flat plates 222, which are parallel to the first pressure plate 11. When the concave plate 221 deforms and the two stops 2213 just come into contact, the concave unit 22 takes the form of a rectangular frame structure.

[0044] like Figure 2 As shown, in one embodiment, an intersection angle is formed at the junction of two adjacent plates. Among the six intersection angles of the hexagonal honeycomb structure 1, the two intersection angles located between the first pressure plate and the second pressure plate 12 are the middle intersection angles 13. The two ends of the concave structure 2 are connected to the two intermediate intersection corners 13 by connecting ribs 21 respectively.

[0045] like Figure 3 As shown, in one embodiment, the stop 2213 has a contact surface 22131, which is used to contact and cooperate with the contact surface 22131 of another stop 2213. When the first pressure plate 11 is in a horizontal state, the angle between the contact surface 22131 and the horizontal plane is θ1, and the angle between the first part 2211 or the second part 2212 and the vertical plane is θ2, where θ1 is greater than or equal to θ2.

[0046] θ1 is greater than or equal to θ2, which is used to ensure that a rectangular frame structure can be formed during the compression process, so as to smoothly enter the second stage of deformation. In practical applications, it is preferable that θ1 is equal to θ2.

[0047] like Figure 3 As shown, in one embodiment, the stop 2213 has a hollow hole 22132.

[0048] The design of the hollow hole 22132 enables the stop block 2213 itself to also have the ability to deform, and can absorb some energy by further loading with compression displacement.

[0049] In practical applications, the stop block 2213 can be of various shapes, such as a triangular block (e.g., Figure 3 As shown), there are various types such as rectangular blocks. The essential function of the stop block 2213 is to restrict the tensile deformation of the concave single unit 22, so that the concave structure 2 can form a second stage deformation with greater stiffness during the loading process.

[0050] In practical applications, the energy-absorbing and vibration-damping unit 100 of this application can adopt the energy-absorbing materials used in the field of drones. In one embodiment, the material of the energy-absorbing and vibration-damping unit 100 is nylon polymer.

[0051] In one embodiment, the base plate 200 may also be made of nylon polymer.

[0052] In practical applications, the base plate 200 and the energy-absorbing and vibration-damping unit 100 can be integrally formed by 3D printing, and then the energy-absorbing and vibration-damping unit 100 can be fixed to the base plate 200 by bonding or other methods.

[0053] like Figure 1 As shown, in one embodiment, the first pressure plate 11 of the energy absorption and vibration damping unit 100 is fixed on the base plate 200.

[0054] This embodiment also discloses a drone, including any of the energy absorption and vibration reduction mechanisms described in this embodiment.

[0055] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present invention.

Claims

1. An energy-absorbing and vibration-damping unit, characterized in that, It includes a hexagonal honeycomb structure and a concave structure set within the hexagonal honeycomb structure; The hexagonal honeycomb structure includes three pairs of parallel plates, one of which is a first pressure plate and the other is a second pressure plate. The concave structure is located in the middle region of the first pressure plate and the second pressure plate. The concave structure includes connecting ribs and hollow concave single units. The two ends of the concave structure are connected to the inner sidewall of the hexagonal honeycomb structure through connecting ribs. The concave single unit is used as an embedded oscillator, which can generate opposite phase motion under the action of external vibration excitation, consume vibration energy, and realize vibration absorption. The concave single unit includes a concave plate connected to the connecting rib. The concave plate forms a first part close to the first pressure plate and a second part close to the second pressure plate with the center line of the corresponding connecting rib as the boundary. The inner sidewall of the first part and the inner sidewall of the second part both have blocks. The energy-absorbing and vibration-damping unit has a first deformation stage and a second deformation stage; During the first deformation stage, the first and second pressure plates of the energy-absorbing and vibration-damping unit are compressed, and the hexagonal honeycomb structure deforms. The connecting ribs drive the inner concave unit to deform, causing the inner concave plate to deform in a flattening trend. The two blocks on the inner concave plate move closer to each other until they contact each other. When the two blocks contact each other, the stiffness of the inner concave unit increases. During the second deformation stage, the two blocks on the concave plate of the energy-absorbing and vibration-damping unit come into contact with each other, the first and second pressure plates are compressed, the hexagonal honeycomb structure continues to deform, and comes into contact with the concave single unit, causing the concave single unit to collapse and deform.

2. The energy-absorbing and vibration-damping unit as described in claim 1, characterized in that, There are multiple concave units, and adjacent concave units are connected by connecting ribs.

3. The energy-absorbing and vibration-damping unit as described in claim 2, characterized in that, The concave single unit has two symmetrically arranged concave plates; The concave unit includes two parallel and oppositely arranged flat plates, which are parallel to the first pressure plate. When the concave plate deforms and the two blocks just come into contact, the concave unit has a rectangular frame structure.

4. The energy-absorbing and vibration-damping unit as described in claim 1, characterized in that, The junction of two adjacent plates forms a junction angle. Among the six junction angles of the hexagonal honeycomb structure, the two junction angles located between the first pressure plate and the second pressure plate are the middle junction angles. The two ends of the concave structure are connected to the two intermediate corners by connecting ribs.

5. The energy-absorbing and vibration-damping unit as described in claim 4, characterized in that, The stop has a contact surface for contacting and engaging with the contact surface of another stop. When the first pressure plate is in a horizontal state, the angle between the contact surface and the horizontal plane is θ1, and the angle between the first part or the second part and the vertical plane is θ2, where θ1 is greater than or equal to θ2.

6. The energy-absorbing and vibration-damping unit as described in claim 5, characterized in that, θ1 equals θ2.

7. The energy-absorbing and vibration-damping unit as described in claim 1, characterized in that, The block has a hollowed-out hole.

8. The energy-absorbing and vibration-damping unit as described in claim 1, characterized in that, The energy-absorbing and vibration-damping unit is made of nylon polymer.

9. An energy-absorbing and vibration-damping mechanism, characterized in that, It includes a base plate and multiple energy-absorbing and vibration-damping units as described in any one of claims 1 to 8, wherein the first pressure plate of the energy-absorbing and vibration-damping unit is fixed on the base plate.

10. A drone, characterized in that, Includes the energy-absorbing and vibration-damping mechanism as described in claim 9.

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