Buckling beam honeycomb structure air damping vibration attenuation device

Abstract

A buckling beam honeycomb structure air damping vibration attenuation device comprises a middle shell, the upper end and the lower end of the middle shell are movably connected with an upper shell and a lower shell through sealing rings respectively, and a plurality of outer tension springs are evenly and annularly arranged between the upper shell and the lower shell along the outer side of the middle shell; the middle shell comprises a shell body, a partition plate is fixedly arranged in the shell body, a spherical connecting piece is fixedly arranged on the lower end face of the partition plate, and an air hole is formed between the partition plate and the spherical connecting piece; a buckling beam honeycomb structure is fixedly arranged between the upper end face of the partition plate of the middle shell and the upper shell, a spherical connecting piece of the middle shell is connected with the valve through threads, and an inner compressed spring is arranged on the periphery of the valve in a surrounding mode, limited through a limiting piece and connected between the lower end face of the partition plate of the middle shell and the lower shell in an abutting mode. The device is compact in structure and reasonable in design, the stability and safety of the structure are remarkably improved, and the device has the excellent bearing capacity, the enhanced damping effect and the good resilience capacity.

Description

Technical Field

[0001] The invention relates to the technical field of vibration reduction devices, and in particular to an air damping vibration reduction device with a buckled beam honeycomb structure. Background Art

[0002] Damping, as a crucial concept in dynamic systems, has the core function of converting the kinetic energy accumulated in the system into heat energy and releasing it into the environment through a series of physical mechanisms, including but not limited to friction, viscosity effect, resistance, and microstructure dissipation inside the material, thereby effectively suppressing or slowing down the vibration amplitude of the system and improving the stability and safety of the system. This energy conversion process is not only the transformation of mechanical energy into heat energy, but also a key means to effectively regulate the dynamic behavior of the system.

[0003] The energy efficiency of the design and application of the damper is not only limited by its inherent properties such as material properties, geometric shape, structural layout, etc., but also deeply affected by the interaction with the surrounding structure in its working environment, especially the dynamic parameters such as the speed, acceleration and displacement of the relative movement of the two ends of the damper. Generally speaking, when the stiffness of the damper is appropriately reduced, it means that its constraint on the movement of the system is weakened, allowing a larger relative movement to occur. This enhancement of relative movement directly promotes the activation of the damping mechanism, so that more kinetic energy is converted into heat energy and consumed, thereby improving the energy efficiency of the damper, which is of great significance for reducing vibration and noise and protecting the structure from excessive stress damage.

[0004] However, when dampers are applied to flexible structures (such as high-rise buildings, bridges, aerospace vehicles, etc.), the situation becomes more complicated. The salient features of flexible structures are their low stiffness and easy deformability, which requires dampers to provide effective damping while taking into account the overall stability and dynamic response characteristics of the structure. At this time, if the stiffness characteristics of the damper are not properly designed, the damper will be over-coupled with the flexible structure under certain conditions, resulting in the movement of the damper itself being restricted, thereby weakening its ability to suppress the vibration of the main structure.

[0005] Liu X (Liu X, Huang X, Hua H. On the characteristics of aquasi-zerostiffness isolator using Euler buckled beam as negative stiffness corrector [J]. Journal of Sound and Vibration, 2013, 332 (14): 3359-3376.) proposed a quasi-zero stiffness vibration absorber, which uses the negative stiffness characteristics of the prestressed Euler beam in the buckling process and connects it in series with a positive stiffness spring to achieve quasi-zero stiffness. However, the working stroke of the vibration absorber is small. When the driving stroke of the vibration absorber increases, the Euler beam is prone to instability due to prestress, bending and deformation, and cannot return to the initial working state autonomously.

[0006] Tan Jiaxu (Tan Jiaxu, Chen Lin, Sun Limin. Research on vibration reduction of cable-stayed cables with friction dampers with negative stiffness [C] / / Structural Engineering Professional Committee of Chinese Society of Theoretical and Applied Mechanics, Liaoning University of Engineering and Technology, Editorial Board of Engineering Mechanics of Chinese Society of Theoretical and Applied Mechanics, Department of Civil Engineering of Tsinghua University, National Key Laboratory of Hydrosphere Science and Water Conservancy Engineering. Proceedings of the 33rd National Conference on Structural Engineering (Volume II). School of Civil Engineering, Tongji University; National Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering, Tongji University; Shanghai Qizhi Research Institute;, 2024:7.DOI:10.26914 / c.cnkihy.2024.023384.) proposed a friction damper with negative stiffness effect. The negative stiffness is achieved by preloading the spring while providing preload on the friction surface, which improves the vibration reduction effect of the friction damper on the cable-stayed cables. However, the effective negative stiffness area of ​​the pre-compression spring of the friction damper is small, the radial size is large, and the adaptability to the change of rope prestress is weak; the friction surface is small, and the friction energy consumption effect is limited; friction can cause equipment damage and the life of the device is short. Summary of the invention

[0007] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an air damping vibration reduction device with a buckled beam honeycomb structure, in which a negative stiffness element (buckled beam honeycomb structure) is connected in parallel with a damping element (air damping, sealing ring friction damping), and then respectively connected in series with two positive stiffness elements (internal compression spring, external tension spring); by connecting the negative stiffness element with the damping element, the relative movement of the two ends of the damping element is promoted, and the damping energy dissipation effect is enhanced; through the reasonable design of the internal mass and the output end mass, the negative stiffness and the positive stiffness coefficient, the tuning effect of mass and stiffness is brought into play, and the damping enhancement effect is significantly improved; the device has a compact structure and a reasonable design, which significantly improves the stability and safety of the structure, and has excellent bearing capacity, enhanced damping effect, and good rebound ability.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] A buckling beam honeycomb structure air damping vibration reduction device comprises a middle shell 1, wherein the upper end and the lower end of the middle shell 1 are movably connected to an upper shell 3 and a lower shell 4 respectively through a sealing ring 2, and a plurality of external tension springs 5 ​​are evenly arranged along the outer side of the middle shell 1 between the upper shell 3 and the lower shell 4; the middle shell 1 comprises a shell body 100, wherein a partition 101 is fixedly arranged inside the shell body 100, and a spherical connector 102 is fixedly arranged on the lower end surface of the partition 101, and an air vent 103 is opened between the partition 101 and the spherical connector 102; a buckling beam honeycomb structure 8 is fixedly arranged between the upper end surface of the partition 101 of the middle shell 1 and the upper shell 3, the spherical connector 102 of the middle shell 1 is connected to a valve 9 through a thread, and an internal compression spring 10 is arranged around the valve 9, and the internal compression spring 10 is limited by a limiter 11 and abuts between the lower end surface of the partition 101 of the middle shell 1 and the lower shell 4.

[0010] Furthermore, a groove 6 is formed on the top of the upper shell 3 , and the groove 6 is connected to the terminal 7 via a thread.

[0011] Furthermore, the buckled beam honeycomb structure 8 includes a base 81, a plurality of support columns 82 are evenly arranged along the circumference of the base 81, a base 83 is arranged at the center of the base 81, the upper sides of the inner walls of two adjacent support columns 82 and the upper sides of the outer walls of the base 83 are respectively connected to corresponding inclined side plates 84, the inclined side plates 84 are connected to the lower ends of the vertical columns 85, and an upper platform 86 is arranged at the top of the vertical column 85; a first through hole 87 is opened at the center of the base 81, and a second through hole 88 is opened at the center of the base 83.

[0012] Furthermore, the radius of the base 81 is R, and the height of the support column 82 is h 3 The length of the inclined side plate 84 is L, the angle between the inclined side plate 84 and the horizontal plane of the base 81 is β, and the height of the vertical column 85 is h 1 , the side length of the upper platform 86 is d; the above parameters meet the following requirements: h 1 =h 3 ; 10°≤β≤60°.

[0013] Furthermore, the first through hole 87 , the second through hole 88 and the air vent 103 are connected to each other.

[0014] Furthermore, a closed space is formed between the partition plate 101 of the middle shell 1 and the upper shell 3 .

[0015] Furthermore, a straight groove or a cross groove is provided on the side of the valve 9 facing away from the spherical connector 102 .

[0016] Furthermore, the stiffness of the inner compression spring 10 is k p >0, the stiffness of the external tension spring 5 is k s '>0, the stiffness of the buckled beam honeycomb structure 8 is k n <0, the mass of the middle shell 1 is m i , the sum of the masses of the upper housing 3 and the terminal 7 is m o , the following formula (a) is satisfied to ensure that the buckled beam honeycomb structure air damping vibration reduction device has a certain static bearing capacity:

[0017]

[0018] Where: k s Indicates overall stiffness. The greater the stiffness, the stronger the static load-bearing capacity.

[0019] The following formula (b) is satisfied to ensure the dynamic stability of the buckled beam honeycomb structure air damping vibration reduction device:

[0020]

[0021] Furthermore, the buckled beam honeycomb structure 8 is made of thermoplastic polyurethane elastomer (TPU).

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention connects the negative stiffness element (buckling beam honeycomb structure 8) with the damping element (air damping, sealing ring friction damping) to promote the relative movement of the two ends of the damping element, thereby solving the problem of limited movement when the damper is applied to a flexible structure.

[0024] 2. The present invention connects the buckling beam honeycomb structure 8 in parallel with the damping element (air damping, sealing ring friction damping), and then connects it in series with the internal compression spring 10, and finally connects it in series with the external tension spring 5. The overall structure meets the positive stiffness condition of formula (a), which solves the problems of poor bearing capacity and weak rebound ability of the negative stiffness damping enhanced structure, so that the structure has a damping enhancement effect while also having a certain static bearing capacity; at the same time, the overall structure also meets the dynamic stability condition of formula (b), which solves the problem of amplified structural vibration amplitude caused by dynamic instability under dynamic load; the device has a compact structure and a reasonable design, which significantly improves the stability and safety of the structure, and has excellent bearing capacity, enhanced damping effect, and good rebound ability.

[0025] 3. The overall structure of the present invention can be designed accordingly according to the dynamic characteristics of the controlled system on the premise of satisfying the positive stiffness condition (a) and the dynamic stability condition (b), and has better adaptability and versatility.

[0026] 4. The present invention proposes a buckled beam honeycomb structure 8, which exhibits negative stiffness characteristics within the compression stroke. By fixing the buckled beam honeycomb structure between the upper end surface of the partition 101 of the middle shell 1 and the upper shell 101, the buckled beam honeycomb structure promotes the relative movement of the two ends of the damper during the structural vibration process, thereby increasing the apparent damping of the structure.

[0027] 5. The buckled beam honeycomb structure 8 of the present invention achieves the arrangement of as many buckled beams as possible in a small volume, thereby enhancing the overall structural rigidity.

[0028] In summary, the present invention proposes a design scheme for a composite system of negative stiffness, positive stiffness and damping elements. The negative stiffness element (buckling beam honeycomb structure 8) is connected in parallel with the damping element (air damping, sealing ring friction damping), and then connected in series with two positive stiffness elements (internal compression spring 10, external tension spring 5) respectively; by connecting the negative stiffness element with the damping element, the relative movement of the two ends of the damping element is promoted, and the damping energy dissipation effect is enhanced; by the reasonable design of the internal mass and the output end mass, the negative stiffness and the positive stiffness coefficient, the tuning effect of mass and stiffness is brought into play, and the damping enhancement effect is significantly improved, which can be widely used in the automotive industry, aerospace and mechanical equipment vibration reduction and other technical fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a plan cross-sectional view of the overall structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention.

[0031] Figure 3 It is the mechanical principle diagram of the present invention.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the buckled beam honeycomb structure 8 of the present invention.

[0033] Figure 5 The buckled beam honeycomb structure 8 of the present invention is a part of Figure 1 .

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the base 81 of the buckled beam honeycomb structure 8 of the present invention.

[0035] Figure 7 It is a planar cross-sectional view of the base 81 of the buckled beam honeycomb structure 8 of the present invention.

[0036] Figure 8 The buckled beam honeycomb structure 8 of the present invention is a part of Figure 2 .

[0037] Fig. 9 The buckled beam honeycomb structure 8 of the present invention is a part of Figure 3 .

[0038] Fig.10 It is a planar cross-sectional view of the upper platform 86 of the buckled beam honeycomb structure 8 of the present invention.

[0039] Fig.11 It is a schematic diagram of the structure of a single-degree-of-freedom air damping vibration reduction device in the prior art.

[0040] Fig.12 The figure is a mechanical principle diagram of a single-degree-of-freedom air damping vibration reduction device in the prior art.

[0041] Fig.13 It is a comparison diagram of the amplification factors of the buckled beam honeycomb structure air damping vibration reduction device of the present invention and the traditional single-degree-of-freedom air damping vibration reduction device.

[0042] Fig.14 This is a comparison diagram of the impact excitation vibration reduction effect of the buckled beam honeycomb structure air damping vibration reduction device of the present invention and the traditional single-degree-of-freedom air damping vibration reduction device.

[0043] In the figure: 1, middle shell; 100, shell body; 101, partition; 102, spherical connector; 103, air vent; 2, sealing ring; 3, upper shell; 4, lower shell; 5, external tension spring; 6, groove; 7, terminal; 8, buckling beam honeycomb structure; 81, base; 82, support column; 83, base; 84, inclined side plate; 85, vertical column; 86, upper platform; 87, first through hole; 88, second through hole; 9, valve; 10, internal compression spring; 11, limiter; 20, sheet metal shell; 21, air bag; 22, air hole; 23, compression spring; 24, movable rod. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0045] See also Figure 1 and Figure 2 A buckling beam honeycomb structure air damping vibration reduction device comprises a middle shell 1, wherein the upper end and the lower end of the middle shell 1 are respectively movably connected with an upper shell 3 and a lower shell 4 through a sealing ring 2, and a plurality of external tension springs 5 ​​are evenly arranged along the outer side of the middle shell 1 between the upper shell 3 and the lower shell 4; the middle shell 1 comprises a shell body 100, wherein a partition 101 is fixedly arranged inside the shell body 100, and a spherical connector 102 is fixedly arranged on the lower end surface of the partition 101, and an air vent 103 is opened between the partition 101 and the spherical connector 102; a buckling beam honeycomb structure 8 is fixedly arranged between the upper end surface of the partition 101 of the middle shell 1 and the upper shell 3, the spherical connector 102 of the middle shell 1 is connected to a valve 9 through a thread, and an internal compression spring 10 is arranged around the valve 9, and the internal compression spring 10 is limited by a limiter 11 and abuts between the lower end surface of the partition 101 of the middle shell 1 and the lower shell 4.

[0046] like Figure 3 As shown, from the perspective of mechanical principles, this embodiment actually proposes a design scheme for a composite system of negative stiffness, positive stiffness and damping elements. The negative stiffness element (buckling beam honeycomb structure 8) is connected in parallel with the damping element (air damping, sealing ring friction damping), and then connected in series with two positive stiffness elements (internal compression spring 10, external tension spring 5) respectively; by connecting the negative stiffness element with the damping element, the relative movement of the two ends of the damping element is promoted, and the damping energy dissipation effect is enhanced; by reasonably designing the internal mass and the output end mass, the negative stiffness and the positive stiffness coefficient, the tuning effect of mass and stiffness is brought into play, and the damping enhancement effect is significantly improved.

[0047] Figure 3 Middle: k p k is the stiffness of the inner compression spring 10; n k is the stiffness of the buckled beam honeycomb structure 8; s ' is an external tension spring 5; m i is the mass of the middle shell 1; m o is the sum of the masses of the upper housing 3 and the terminal 7; u is the displacement of the upper housing 3; u in is the displacement of the middle shell 1; c is the equivalent damping coefficient under the combined effect of air damping and sealing ring friction damping.

[0048] A closed space is formed between the partition 101 of the middle shell 1 and the upper shell 3. When the upper shell 3 moves relative to the partition 101 of the middle shell 1, the air in the closed space is compressed or expanded, generating a pneumatic damping effect. The air flow rate is controlled by adjusting the valve 9 to control the opening and closing degree of the air vent 103, thereby adjusting the air damping. When the upper shell 3 moves relative to the middle shell 1, the upper shell 3 and the sealing ring 2 rub against each other to generate friction damping.

[0049] like Figure 1 and Figure 2 As shown, a groove 6 is provided on the top of the upper housing 3, and the groove 6 is connected to a terminal 7 through a thread. The terminal 7 is provided to facilitate connection with a controlled object or a controlled subject.

[0050] like Figure 4 , Figure 5 and Figure 6 As shown, the buckled beam honeycomb structure 8 includes a base 81, and a plurality of support columns 82 are evenly arranged along the circumference of the base 81. A base 83 is arranged at the center of the base 81. The upper sides of the inner walls of two adjacent support columns 82 and the upper sides of the outer walls of the base 83 are respectively connected to three inclined side plates 84, and the three inclined side plates 84 are connected to the lower ends of three side surfaces of a vertical column 85. An upper platform 86 is arranged at the top of the vertical column 85. A first through hole 87 is opened at the center of the base 81, and a second through hole 88 is opened at the center of the base 83.

[0051] This embodiment proposes a buckled beam honeycomb structure 8, which exhibits negative stiffness characteristics within the compression stroke. By fixing the buckled beam honeycomb structure between the upper end surface of the partition 101 and the upper shell 3, the buckled beam honeycomb structure exhibits relative movement of the two ends of the damper during structural vibration, thereby increasing the apparent damping of the structure. By adjusting the external tension spring 5 and the internal compression spring 10 to give the structure a time prestress, the buckled beam honeycomb structure 8 works in a specified negative stiffness area.

[0052] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the radius of the base 81 is R, and the height of the support column 82 is h 3 The length of the inclined side plate 84 is L, the angle between the inclined side plate 84 and the horizontal plane of the base 81 is β, and the height of the vertical column 85 is h 1 , the side length of the upper platform 86 is d; the thickness of the inclined side plate 84 is t, and the radius of the first through hole 87 is r; the above parameters meet the following requirements: h 1 =h 3 ; 10°≤β≤60°.

[0053] The height of the support column 82 is h 3 , the length of the inclined side plate 84 is L and the height of the vertical column 85 is h 1 Determines the compression stroke of the honeycomb structure. When h 1 =h 3 =Lsinβ, the compression stroke reaches the maximum; the angle β between the inclined side plate 84 and the horizontal plane of the base 81 and the thickness t of the inclined side plate 84 determine the stiffness characteristics of the honeycomb structure; increasing the thickness t of the inclined side plate 84 is beneficial to improving the stiffness level of the honeycomb structure, and the larger the angle β between the inclined side plate 84 and the horizontal plane of the base 81, the more obvious the negative stiffness characteristics.

[0054] like Figure 1 , Figure 5 and Figure 6 As shown, the first through hole 87, the second through hole 88 and the air vent 103 are connected to each other. Since the first through hole 87, the second through hole 88 and the air vent 103 are connected to each other, the opening and closing degree of the air vent 103 is controlled by adjusting the valve 9, and the air pressure between the partition plate 101 of the middle shell 1 and the upper shell 3 is further changed to achieve the adjustment of the air damping size.

[0055] like Figure 1 As shown, a closed space is formed between the partition plate 101 of the middle shell 1 and the upper shell 3. When the middle shell 1 and the upper shell 3 move relative to each other, the air pressure in the closed space is changed, generating a reaction force to resist the relative movement.

[0056] like Figure 1 As shown, the valve 9 is provided with a slot or a cross slot on the side away from the spherical connector 102. The valve 9 can be rotated by means of a screwdriver or other tool to control the opening and closing degree of the air hole, so as to adjust the pneumatic damping when the upper shell moves relative to the middle shell.

[0057] The stiffness of the inner compression spring 10 is k p >0, the stiffness of the external tension spring 5 is k s '>0, the stiffness of the buckled beam honeycomb structure 8 is k n <0, the mass of the middle shell 1 is m i , the sum of the masses of the upper housing 3 and the terminal 7 is m o , the following formula (a) is satisfied to ensure that the buckled beam honeycomb structure air damping vibration reduction device has a certain static bearing capacity:

[0058]

[0059] Where: k s Indicates overall stiffness. The greater the stiffness, the stronger the static load-bearing capacity.

[0060] The following formula (b) is satisfied to ensure the dynamic stability of the buckled beam honeycomb structure air damping vibration reduction device:

[0061]

[0062] The buckled beam honeycomb structure 8 is made of thermoplastic polyurethane elastomer (TPU). Thermoplastic polyurethane elastomer has high elasticity, high strength and high toughness, can withstand large tensile and compressive forces, and can quickly return to its original state after being subjected to force.

[0063] Fig.11 This is a schematic diagram of the structure of a single-degree-of-freedom air damping vibration reduction device in the prior art. It is formed by two sheet metal shells 20 to form a cylindrical cavity, in which there is a drum-shaped airbag 21. There is an air hole 22 at the bottom of the airbag 21. When the airbag 21 is compressed, the internal gas is discharged through the air hole 22, which plays a role in pneumatic damping. There is a compression spring 23 inside the airbag 21 to provide a rebound force when the airbag 21 is compressed. The upper part of the airbag 21 presses against the movable rod 24, and the movable rod 24 moves inward to compress the airbag 21. The compression spring 23 pushes up the airbag 21 to cause the movable rod 24 to extend back. This structural scheme connects the positive stiffness spring (compression spring 23) in parallel to the air spring, so that the structure has a certain rebound characteristic, but the positive stiffness weakens the damping energy dissipation effect of the air, so it is usually used for vibration isolation and rarely used for damping energy dissipation vibration reduction.

[0064] Fig.12 The mechanical principle diagram of the single-degree-of-freedom air damping vibration reduction device in the prior art is shown in FIG. s , the damping coefficient is c, and the mass is m. When k sWhen the elastic force is relatively weak, the damping force is easily greater than the elastic force, which reduces the damping energy dissipation effect. Therefore, it is difficult for this structure to play a damping energy dissipation role in a flexible structure. If the structural stiffness k is forcibly reduced s , the static bearing capacity of the structure is reduced.

[0065] The buckled beam honeycomb structure air damping vibration reduction device disclosed in this embodiment has a stronger damping energy dissipation effect compared with the traditional single-degree-of-freedom air damping vibration reduction device. The advantages of this embodiment are demonstrated from two aspects: the dynamic amplification coefficient and the impact excitation vibration reduction effect.

[0066] Power amplification factor:

[0067] like Fig.13 As shown in the figure, when the buckled beam honeycomb structure air damping vibration reduction device and the traditional single-degree-of-freedom air damping vibration reduction device use the same damping element (same damping coefficient), the same overall mass and the same equivalent stiffness, the dynamic amplification coefficient is compared and analyzed as follows:

[0068] from Fig.13 It can be seen that at the same damping ratio The buckled beam honeycomb structure air damping vibration reduction device has a lower resonance peak. 0 When k is equal to 0, 0.707 and 1 respectively, it corresponds to the single degree of freedom damping system with no damping, damping that just makes the resonance peak disappear, and critical damping, which are represented by black dotted lines in the figure. n / k p = -0.82, the low-frequency peak of the buckled beam honeycomb structure air damping vibration reduction device just disappears. At this time, ξ 0 =0.0277, which is much lower than the damping ratio of 0.707 when the single-degree-of-freedom damper just makes the resonance peak disappear. This phenomenon shows that the buckled beam honeycomb structure air damping vibration reduction device can achieve better vibration suppression performance under low damping conditions. Where: c represents the damping coefficient, m represents the sum of the masses of the middle shell 1, the upper shell 3 and the terminal 7; k s Represents the overall stiffness of the device; k p k represents the tangential stiffness of the inner compression spring 10; n represents the tangent stiffness of the buckled beam honeycomb structure 8 .

[0069] Fig.13 In Chinese: NSAD represents the buckled beam honeycomb structure air damping vibration reduction device disclosed in the present invention; SDOF represents the traditional single degree of freedom air damping vibration reduction device; represents the ratio of the tangent stiffness of the buckled beam honeycomb structure 8 to the tangent stiffness of the internal compression spring 10; γ represents the frequency ratio; ξ 0 Represents the sum of the masses of the upper housing 3 and the terminal 7.

[0070] like Fig.14 As shown in the figure, the total mass and overall equivalent stiffness of the buckled beam honeycomb structure air damping vibration reduction device and the traditional single-degree-of-freedom air damping vibration reduction device are the same, which are m = 1 kg and k s =100N / mm. The system design variables of the buckled beam honeycomb structure air damping vibration reduction device are selected as: k s / k p =1, k n / k p =0.73, m i =0,ξ 0 =0.05. When the output end is subjected to a 1mm / s impact excitation, the transient response is Fig.14 It can be clearly seen that the buckled beam honeycomb structure air damping vibration reduction device has a lower vibration amplitude and a faster decay time. Wherein, m represents the sum of the masses of the middle shell 1, the upper shell 3 and the terminal 7; k s Represents the overall stiffness of the device; k p k represents the tangential stiffness of the inner compression spring 10; n represents the tangent stiffness of the buckled beam honeycomb structure 8; m i represents the mass of the middle shell 1; ξ 0 Represents the sum of the masses of the upper housing 3 and the terminal 7.

[0071] Fig.14 Middle: The black solid line is a conventional single-degree-of-freedom air damping vibration reduction device; the red dotted line is the buckled beam honeycomb structure air damping vibration reduction device of this embodiment.

[0072] The working principle of the present invention is:

[0073] The present invention can be used as a connecting piece between the controlled structure and the base, or used to replace some elastic components of the controlled structure, or can be connected in parallel with the components of the controlled structure. When the controlled object structure vibrates, the upper shell 3 and the lower shell 4, the upper shell 3 and the middle shell 1 all undergo relative displacement. Due to the overall stiffness k between the upper shell 3 and the lower shell 1 s Much larger than the stiffness k between the upper shell 3 and the middle shell 1 n , so that the relative displacement between the upper shell 3 and the middle shell 1 is greater than the relative displacement between the upper shell 3 and the lower shell 4, that is, while ensuring the overall connection stiffness, it promotes the relative movement of the two ends of the damping element and enhances the damping energy consumption.

Claims

1. A buckled beam honeycomb structure air damping vibration reduction device, comprising a middle shell (1), wherein the upper end and the lower end of the middle shell (1) are respectively movably connected to an upper shell (3) and a lower shell (4) through a sealing ring (2), characterized in that: A plurality of external tension springs (5) are evenly arranged along the outer side of the middle shell (1) between the upper shell (3) and the lower shell (4); the middle shell (1) comprises a shell body (100), a partition (101) is fixedly arranged inside the shell body (100), a spherical connecting piece (102) is fixedly arranged on the lower end surface of the partition (101), and an air vent (103) is provided between the partition (101) and the spherical connecting piece (102); a buckling beam honeycomb structure (8) is fixedly arranged between the upper end surface of the partition (101) of the middle shell (1) and the upper shell (3), the spherical connecting piece (102) of the middle shell (1) is connected to the valve (9) through a thread, and an internal compression spring (10) is arranged around the valve (9), and the internal compression spring (10) is limited by a limiting piece (11) and abuts between the lower end surface of the partition (101) of the middle shell (1) and the lower shell (4).

2. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1, characterized in that: The top of the upper shell (3) is provided with a groove (6), and the inside of the groove (6) is connected to the terminal (7) via a thread.

3. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1, characterized in that: The buckled beam honeycomb structure (8) comprises a base (81), wherein a plurality of support columns (82) are evenly arranged along the circumference of the base (81), a base platform (83) is arranged at the center of the base (81), the upper sides of the inner walls of two adjacent support columns (82) and the upper sides of the outer walls of the base platform (83) are respectively connected to corresponding inclined side plates (84), the inclined side plates (84) are connected to the lower ends of the vertical columns (85), and an upper platform (86) is arranged at the top ends of the vertical columns (85); a first through hole (87) is opened at the center of the base (81), and a second through hole (88) is opened at the center of the base platform (83).

4. The buckled beam honeycomb structure air damping vibration reduction device according to claim 3, characterized in that: The radius of the base (81) is R, the height of the support column (82) is h3, the length of the inclined side plate (84) is L, the angle between the inclined side plate (84) and the horizontal plane of the base (81) is β, the height of the vertical column (85) is h1, and the side length of the upper platform (86) is d; the above parameters meet the following requirements: h1=h3; 5. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1 or 3, characterized in that: The first through hole (87), the second through hole (88) and the air vent (103) are connected to each other.

6. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1, characterized in that: A closed space is formed between the partition plate (101) of the middle shell (1) and the upper shell (3).

7. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1, characterized in that: A slot or a cross slot is provided on the side of the valve (9) facing away from the spherical connecting piece (102).

8. The buckled beam honeycomb structure air damping vibration reduction device according to claim 1, characterized in that: The stiffness of the inner compression spring (10) is k p >0, the stiffness of the external tension spring (5) is k s '>0, the stiffness of the buckled beam honeycomb structure (8) is k n <0, the mass of the middle shell (1) is m i , the sum of the masses of the upper housing (3) and the terminal (7) is m o , the following formula (a) is satisfied to ensure that the buckled beam honeycomb structure air damping vibration reduction device has a certain static bearing capacity: Where: k s Indicates overall stiffness. The greater the stiffness, the stronger the static load-bearing capacity. The following formula (b) is satisfied to ensure the dynamic stability of the buckled beam honeycomb structure air damping vibration reduction device:

9. A buckled beam honeycomb structure air damping vibration reduction device according to any one of claims 1, 3 or 4, characterized in that: The buckled beam honeycomb structure (8) is made of thermoplastic polyurethane elastomer (TPU).

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