Cellular damping structure with embedded periodic collision energy trap

Abstract

The application discloses a honeycomb damping structure embedded with period collision energy traps, which comprises a honeycomb sandwich structure body and period collision energy traps embedded in a honeycomb core layer of the honeycomb sandwich structure body; the honeycomb core layer, together with an upper panel of an upper surface and a lower panel of a lower surface, forms the honeycomb sandwich structure body; the period collision energy traps are formed by collision energy trap functional micro-units arranged according to a predetermined period rule; the collision energy trap functional micro-units are formed by mass blocks filled in honeycomb cavities of the honeycomb core layer; gaps exist between the mass blocks and the honeycomb cavities, the mass blocks can freely move in the honeycomb cavities and realize transmission and absorption of vibration energy through non-elastic collision with wall surfaces of the honeycomb cavities. The period collision energy traps are arranged in a periodical manner, and based on contact and collision between the filled period collision energy trap mass blocks and the honeycomb sandwich structure, the honeycomb structure vibration energy can be effectively absorbed in a wide frequency range.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engineering new functional materials technology, in particular to a honeycomb damping structure with embedded periodic collision energy trap with excellent damping performance. BACKGROUND

[0002] Honeycomb structure is a precious gift from nature to mankind, because of its ingenious structure and excellent mechanical properties, it has become the darling of lightweight materials, and has been widely used in aerospace, transportation engineering, shipbuilding engineering and other engineering technology fields. In recent years, its related scientific theories and technology development have made great progress.

[0003] Traditional honeycomb structure mainly focuses on the improvement of the static mechanical characteristics of the structure, but lacks the design of the dynamic characteristics. With the increasing demand for damping and shock resistance in engineering field, the multifunctional integrated innovative design of honeycomb structure makes it not only retain the original beneficial static mechanical properties, but also expand excellent damping and shock resistance performance, which has become an important part of the development front of honeycomb structure technology. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art, and to provide a honeycomb damping structure with embedded periodic collision energy trap, which is convenient to process, simple in structure and excellent in damping performance. The honeycomb damping structure has good static mechanical properties of honeycomb structure and good damping and shock resistance performance.

[0005] The technical scheme adopted to achieve the purpose of the present application is:

[0006] A honeycomb damping structure with embedded periodic collision energy trap, comprising a honeycomb sandwich structure main body and a periodic collision energy trap embedded in the honeycomb core layer of the honeycomb sandwich structure main body; the honeycomb core layer and the upper surface of the upper panel, the lower surface of the lower panel together constitute the honeycomb sandwich structure main body; the periodic collision energy trap is composed of collision energy trap functional micro units arranged according to a predetermined periodic rule; the collision energy trap functional micro unit is composed of a mass block filled in the honeycomb cell of the honeycomb core layer; there is a gap between the mass block and the honeycomb cell, which can move freely in the honeycomb cell and realize the transmission and absorption of vibration energy through non-elastic collision with the wall surface of the honeycomb cell.

[0007] Preferably, the total mass of the filled mass block is 1%-10% of the mass of the corresponding honeycomb sandwich structure main body.

[0008] Preferably, the collision restitution coefficient of the mass block is 0.5-0.9.

[0009] Preferably, the gap between the mass block and the honeycomb cell cavity is determined by the vibration displacement of the honeycomb sandwich structure body, and the gap is less than or equal to the vibration amplitude of the honeycomb sandwich structure body in a predetermined frequency band.

[0010] Preferably, the mass blocks of the same volume of the periodic collision energy well are completely filled or partially filled in the honeycomb cell cavity.

[0011] Preferably, the mass blocks of the periodic collision energy well include at least two mass blocks of different volumes, and the mass blocks of different volumes are arranged periodically to form a multi-periodic arrangement structure or a mixed periodic arrangement structure.

[0012] Preferably, the honeycomb cell is a columnar body with a predetermined height, and its cross section is polygonal. A plurality of honeycomb cells are arranged to form the honeycomb core layer, and adjacent honeycomb cells share a cavity wall.

[0013] Preferably, the upper panel and the lower panel are made of carbon fiber plates, and the honeycomb core layer is made of aluminum.

[0014] The honeycomb vibration damping structure with embedded periodic collision energy wells of the present invention has periodic collision energy wells arranged periodically, and realizes broadband effective absorption of vibration energy of the honeycomb structure based on the contact collision between the filled periodic collision energy well mass blocks and the honeycomb sandwich structure.

[0015] The honeycomb vibration damping structure with an embedded periodic collision energy well of the present invention can stimulate the targeted transfer of vibration energy from the honeycomb structure to the periodic collision energy well through the contact collision of the periodic collision energy well mass block, and then consume it through damping during contact, thereby having vibration damping and impact resistance capabilities; through the contact collision of the periodic collision energy well mass block, it can stimulate the transfer of energy between modal vibrations of various orders in different frequency bands of the honeycomb structure, thereby ensuring the broadband characteristics of the vibration damping and impact resistance effect.

[0016] The honeycomb vibration damping structure with an embedded periodic collision energy well of the present invention helps to realize the integrated design of honeycomb structure functions, achieves good broadband vibration absorption and control while ensuring static performance, and is easy to process and has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a honeycomb vibration damping structure with an embedded periodic collision energy well according to the first embodiment of the present invention.

[0018] Figure 2 It is an enlarged view of the periodic collision energy well of the present invention.

[0019] Figure 3 FIG. 1 is a schematic diagram of an incompletely filled periodic collision energy well according to a second embodiment of the present invention.

[0020] Figure 4 FIG. 4 is a schematic diagram of a multi-period collision energy well according to a third embodiment of the present invention.

[0021] Figure 5 Schematic diagram of a mixed filling collision energy well according to a fourth embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1- Honeycomb sandwich structure body;

[0024] 11-upper panel, 12-honeycomb core layer, 13-lower panel,

[0025] 2-periodic collision energy well;

[0026] 21 - honeycomb cell, 22 - mass block, 23 - first mass block, 24 - second mass block, 25 - third mass block; DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] refer to Figures 1 to 2 As shown, a honeycomb vibration damping structure with an embedded periodic collision energy well comprises a honeycomb sandwich structure body 1 and a periodic collision energy well 2 embedded in its honeycomb core layer 12; the honeycomb sandwich structure body 1 is composed of an upper panel 11, a honeycomb core layer 12 and a lower panel 13 connected together; the periodic collision energy well 2 comprises a certain number of lightweight mass blocks 22 filled in the honeycomb core layer 12 according to a predetermined periodic rule; the mass blocks 22 are filled in the honeycomb cells 21 constituting the honeycomb core layer, and there is a certain gap between the mass blocks 22 and the inner wall of the honeycomb cell 21. They can move freely in the honeycomb cavity 21 and transmit and absorb vibration energy through inelastic collision with the cavity wall of the honeycomb cell 21.

[0029] In the present application, the periodic collision energy well 2 has a periodic structure as a whole. Each honeycomb cell with a mass block forms a basic lattice unit of the periodic structure of the periodic collision energy well, and the periodic arrangement of the lattice units forms an overall periodic structure.

[0030] The mass ratio of the mass block, the collision restitution coefficient, and the gap (the gap between the mass block 4 and the inner wall of the honeycomb cells that constitute the honeycomb core layer) are the key design parameters for achieving the technical effects of vibration reduction and impact resistance. Preferably, the mass of the mass block should be approximately 1%-10% of the mass of the honeycomb sandwich structure to ensure its lightweight properties; the collision restitution coefficient should be between 0.5-0.9 to ensure efficient momentum exchange and energy absorption during collisions; and the gap size is determined by the vibration displacement of the honeycomb structure, preferably slightly smaller than the vibration amplitude. For example, if the average vibration amplitude of the honeycomb structure in a certain frequency band is 5mm, the gap size can be set to approximately 3mm-5mm.

[0031] The above design parameters are only preliminary references in the design stage. In order to achieve more efficient vibration reduction and impact resistance, a more precise design can be carried out by combining numerical simulation and experiments.

[0032] In some embodiments, the honeycomb cell is a columnar body with a predetermined height, and its cross-section is polygonal, such as a hexagon. A plurality of honeycomb cells are arranged to form the honeycomb core layer, and adjacent honeycomb cells share a cavity wall. Of course, the shape of the honeycomb cell may also be other shapes, but is not limited thereto.

[0033] In addition, the materials, shapes and other parameters of the honeycomb sandwich structure and the filled mass blocks in this application are not the key parameters of the present invention. They are reasonably selected on the premise of giving priority to meeting the requirements of the aforementioned main design parameters. For example, the mass blocks can be spherical or in the shape of blocks of other geometric shapes. The materials can be metal balls or fiber balls, etc. In some embodiments, the upper panel and the lower panel are made of carbon fiber plates, and the honeycomb core layer is made of aluminum, and they are bonded together.

[0034] In this application, the mass block can be Figure 1 The periodic arrangement shown is that a mass block 22 of the same volume is arranged in each honeycomb cell of each honeycomb core layer.

[0035] In this application, the mass blocks of the same volume can also be Figure 3 The periodic arrangement shown is as follows Figure 3 As shown, the mass blocks 22 of the same volume are not completely filled in all honeycomb cells with each honeycomb cell as the basic periodic unit, but are arranged periodically according to a certain filling ratio to form an incompletely filled periodic collision energy well. For example, in the horizontal and vertical directions of the honeycomb core layer, each honeycomb cell is arranged at intervals, and in the vertical direction, a row of honeycomb cells are arranged at intervals, and adjacent horizontal or vertical mass blocks are staggered. Figure 1In the arrangement shown, this embodiment can optimize the total filling mass of the periodic collision energy well and adjust the effective frequency band of the vibration reduction effect by adjusting the filling ratio.

[0036] In the present application, the mass blocks mentioned above can also be two or more mass blocks with different volumes, which are filled into the honeycomb core layer according to a periodic rule to form two periodic collision energy wells with periodic characteristics. Figure 4 The figure shows an embodiment of a filling system with two periodic arrangement specifications. The filling system is formed by a first mass block 23 and a second mass block 24. The volume of the first mass block is larger than that of the second mass block. The first and second mass blocks are each periodically filled in the honeycomb core layer, filling all the honeycomb cells. Specifically, in each row and column, a second mass block is placed between two first mass blocks to achieve a periodic arrangement. In this embodiment, through a multi-periodic design, by adjusting the design parameters of each filling mass block, such as the gap, mass ratio, restitution coefficient, and filling ratio, it is possible to simultaneously control multi-band vibrations and broaden the effective bandwidth.

[0037] In the present application, the mass blocks may also be filled in a more complex arrangement according to a certain rule to form a mixed periodic collision energy well. Figure 5 An embodiment of a mixed periodic collision energy well is provided, comprising three mass blocks of different volumes, such as a first mass block 23, a second mass block 24, and a third mass block 25. The first mass block is arranged in the honeycomb cells on the upper and lower sides of a rectangular honeycomb core layer, the third mass block is arranged in the honeycomb cells on the left and right sides, and the second mass block is arranged in the inner honeycomb cells to form a rectangular diagonal arrangement. The first mass block 23 has the largest volume, the second mass block 24 has the smallest volume, and the third mass block 25 has the second largest volume. The characteristics and main technical effects of this embodiment are that, based on the vibration characteristics of the honeycomb structure, mass blocks of specific specifications are filled in the weak points or local key positions of the structure to achieve more efficient vibration control. This embodiment is applicable to the "one-to-one" design of important key components in engineering, structures with complex vibration characteristics, and structures with special design requirements. The main design parameters of each filling specification are still the mass ratio, gap, restitution coefficient, filling ratio, etc. Preferably, the above design parameters are determined by simulation in combination with the vibration environment.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A honeycomb vibration damping structure with an embedded periodic collision energy well, characterized in that: It includes a honeycomb sandwich structure body and a periodic collision energy well embedded in the honeycomb core layer of the honeycomb sandwich structure body; the honeycomb core layer, the upper panel on the upper surface, and the lower panel on the lower surface together constitute the honeycomb sandwich structure body; the periodic collision energy well is composed of collision energy well functional micro units arranged according to a predetermined periodic rule; the collision energy well functional micro units are composed of mass blocks filled in the honeycomb cells of the honeycomb core layer; there is a gap between the mass block and the honeycomb cell cavity, and the mass block can move freely in the honeycomb cell cavity and transmit and absorb vibration energy through inelastic collision with the wall of the honeycomb cell cavity; there is only one mass block in the honeycomb cell cavity filled with the mass block; the volumes of the mass blocks in different honeycomb cells are the same or different, forming a multi-periodic arrangement structure or a mixed periodic arrangement structure; the gap is less than or equal to the vibration amplitude of the honeycomb sandwich structure body in a predetermined frequency band; adjacent honeycomb cells share a cavity wall.

2. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The total mass of the filled mass blocks is 1%-10% of the mass of the corresponding honeycomb sandwich structure body.

3. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The collision recovery coefficient of the mass block is 0.5-0.

9.

4. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The gap between the mass block and the honeycomb cell cavity is determined by the vibration displacement of the honeycomb sandwich structure body.

5. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The mass blocks of the periodic collision energy well include mass blocks of the same volume, and the mass blocks of the same volume are completely filled or partially filled in the honeycomb cell cavity.

6. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The mass blocks of the periodic collision energy well include at least two mass blocks with different volumes, and the mass blocks with different volumes are arranged periodically to form a multi-periodic arrangement structure or a mixed periodic arrangement structure.

7. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The honeycomb cell is a columnar body with a predetermined height and a polygonal cross section. A plurality of honeycomb cells are arranged to form the honeycomb core layer.

8. The honeycomb vibration damping structure with an embedded periodic collision energy well according to claim 1, characterized in that: The upper panel and the lower panel are made of carbon fiber plates, and the honeycomb core layer is made of aluminum.

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