Bionic metamaterial structure for low-frequency broadband vibration isolation and superstructure device

Abstract

The application discloses a kind of bionic metamaterial structure and superstructure device for low-frequency broadband vibration isolation, which includes support module and vibration modulation module;Support module includes central support part and multiple radial support parts, the inner side end of each radial support part is connected with the central support part, and is periodically arranged around the center of the central support part, and the adjacent two radial support parts form a sector region between them;Vibration modulation module is arranged in sector region;Vibration modulation module includes at least one meander strip base element, both ends of meander strip base element are connected with the adjacent two radial support parts respectively, and each connection point is located between the inner side end and the outer side end of radial support part.The application relates to the field of intelligent bionic materials and vibration and noise reduction, which not only can realize low-frequency broadband vibration isolation effect under high bearing / small size, but also is easy to process, and can be quickly adjusted and improved according to actual control requirements.

Description

Technical Field

[0001] This invention relates to the field of intelligent biomimetic materials and vibration reduction and noise reduction technology, specifically a biomimetic metamaterial structure and metastructure device for low-frequency broadband vibration reduction and isolation. Background Technology

[0002] Vibration problems are widespread in human production and daily life. However, the vibration problems are even more prominent in modern high-end equipment such as airplanes, high-speed trains, ships, and precision machine tools. Vibration problems have seriously affected the key core performance indicators of modern high-end equipment, such as ride comfort and manufacturing precision.

[0003] Vibration reduction and isolation technology is an important means of controlling equipment vibration. In engineering practice, traditional vibration reduction and isolation technologies mainly include damping vibration reduction technology (such as constrained damping materials), vibration absorption technology (such as active vibration absorbers), and vibration isolation technology (such as floating raft vibration isolation systems). These traditional vibration reduction and isolation technologies have many advantages, but also have many shortcomings and limitations. For example, traditional damping vibration reduction technology can achieve good vibration reduction and isolation effects at mid-to-high frequencies, but its low-frequency performance is poor; traditional vibration absorption technology can operate at very low frequencies, but its operating bandwidth is very narrow; traditional vibration isolation technology can achieve high load-bearing capacity, excellent low-frequency performance, or small size on its own, but it cannot simultaneously achieve low-frequency performance under high load-bearing capacity / small size. Therefore, traditional vibration reduction and isolation technologies can no longer meet the increasingly diversified vibration reduction and isolation needs of equipment. How to achieve low-frequency broadband vibration reduction and isolation control of equipment under high load-bearing capacity / small size is an engineering and scientific research problem that urgently needs to be solved in the field of vibration and noise control.

[0004] In recent years, the technology of mechanical / acoustic metamaterials has developed rapidly. Acoustic metamaterials are novel composite materials / structures composed of specially designed microstructural units, possessing a series of extraordinary elastic wave modulation characteristics such as low-frequency elastic wave bandgap, negative density, negative modulus, and negative refraction. Current research on acoustic metamaterials technology shows that by utilizing the extraordinary elastic wave modulation capability of metamaterial structures, it is possible to achieve "small-size control of low-frequency large wavelengths," providing a new approach to solving the problem of low-frequency vibration reduction and isolation within small dimensions. Summary of the Invention

[0005] To address the existing problem of how to achieve low-frequency broadband vibration reduction and isolation control of equipment under high load and small size, this invention draws on the concept of acoustic metamaterials and proposes a biomimetic metamaterial structure and metastructure device for low-frequency broadband vibration reduction and isolation, which can achieve low-frequency broadband vibration reduction and isolation effects under high load and small size.

[0006] To achieve the above objectives, the present invention provides a biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation, comprising a support module and a vibration modulation module;

[0007] The support module includes a central support part and multiple radial support parts. The inner ends of each radial support part are connected to the central support part and are arranged in an axisymmetric and periodic manner around the center of the central support part. A fan-shaped area is formed between two adjacent radial support parts.

[0008] The vibration modulation modules are multiple and correspond one-to-one with the sector regions, and the vibration modulation modules are located within the corresponding sector regions;

[0009] The vibration modulation module includes at least one tortuous strip-shaped element, the two ends of which are respectively connected to two adjacent radial support portions, and each connection point is located between the inner end and the outer end of the radial support portion.

[0010] The zigzag strip-shaped basic element is a bent beam structure, a curved beam structure, or a straight beam structure, or the zigzag strip-shaped basic element is a combined beam structure of at least two types of beams, including straight beams, bent beams, and curved beams.

[0011] In one embodiment, the biomimetic metamaterial structure further includes corner support devices, wherein there are multiple corner support devices and each corresponds to one of the radial support portions;

[0012] The corner support device is fixedly connected below the outer end of the radial support portion.

[0013] In one embodiment, the neutral axes of each of the zigzag strip-shaped primitives are located in the same plane or approximately in the same plane.

[0014] In one embodiment, the central support is a solid column, a beam assembly, a rod assembly, or a plate assembly, or the central support is an assembly of beams, rods, and plates.

[0015] The radial support is a rod-like structure, or a beam-like structure with local reinforcing ribs and / or local perforations, or a composite structure.

[0016] In one embodiment, the outer surfaces of the central support and the radial support are both covered with a viscoelastic damping layer.

[0017] The radial support is filled with heat-insulating and sound-absorbing materials.

[0018] In one embodiment, the vibration modulation modules in each of the said sector regions are arranged in a single layer, a double layer, or a multi-layer arrangement;

[0019] If the vibration modulation module is arranged in two or more layers, the vibration modulation modules in adjacent layers are arranged in a multi-coordinated manner with spatial intersection, frequency band interleaving, and scale coupling.

[0020] In one embodiment, within the same sector region, the nth zigzag strip unit has p bends. n The number of bends in the nth meandering strip-shaped unit is s. n , where p n s is a positive integer n =p n +1.

[0021] In one embodiment, within the same sector-shaped region, the p-th bending angle of the nth zigzag strip-shaped element is k. np The arc of the first bend corresponding to the p-th bend of the nth zigzag element is h. np1 The arc of the second bend corresponding to the p-th bend of the nth zigzag element is h. np2 , of which 0 <h np1 <π,0 <h np2 <π,0 <k np <π.

[0022] To achieve the above objectives, the present invention also provides a metamaterial device for low-frequency broadband vibration isolation, comprising m of the above-mentioned biomimetic metamaterial structures;

[0023] From bottom to top, m of the biomimetic metamaterial structures are connected in series, where m is an odd number and m≥3;

[0024] From bottom to top, the central support of the w-th biomimetic metamaterial structure is connected to the central support of the adjacent biomimetic metamaterial structure above it through a central connection, where w is a positive integer and 1≤w≤m-1;

[0025] From bottom to top, the outer periphery of the radial support portion of the y-th biomimetic metamaterial structure is connected to the outer periphery of the radial support portion of the adjacent biomimetic metamaterial structure above it through an outer periphery connection portion, where y is a positive integer and 2≤y≤m-1.

[0026] To achieve the above objectives, the present invention also provides a metamaterial device for low-frequency broadband vibration reduction, comprising t of the above-mentioned biomimetic metamaterial structures;

[0027] From bottom to top, t of the biomimetic metamaterial structures are connected in series, where t is an even number and t≥2;

[0028] From bottom to top, the central support of the s-th biomimetic metamaterial structure is connected to the central support of the adjacent biomimetic metamaterial structure above it through a central connecting part, where s is an odd number and 1≤s≤t-1;

[0029] From bottom to top, the outer periphery of the radial support portion of the h-th biomimetic metamaterial structure is connected to the outer periphery of the radial support portion of the adjacent biomimetic metamaterial structure above it via an outer periphery connecting portion, where h is an even number, and h <t。

[0030] Compared with the prior art, the present invention has the following beneficial technical effects:

[0031] This invention provides a biomimetic metamaterial structure and metastructure device for low-frequency broadband vibration reduction and isolation. In application, it can be placed beneath precision instruments in modern high-end equipment, effectively reducing overall vibration caused by the operation of such equipment, lowering its failure and damage rates, and significantly improving its stability, accuracy, and reliability. Simultaneously, this invention achieves low-frequency ultra-wideband vibration reduction and isolation performance while also considering high stiffness, high strength, and other high load-bearing capabilities. The platform has a small thickness and compact structure, offering ample and flexible design space and allowing for modular customization. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the biomimetic metamaterial structure in Embodiment 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the first embodiment of the support module in Embodiment 1 of the present invention;

[0035] Figure 3 This is a schematic diagram of a second embodiment of the support module in Embodiment 1 of the present invention;

[0036] Figure 4 This is a schematic diagram of the connection structure between the arc-shaped region and the vibration modulation module in Embodiment 1 of the present invention;

[0037] Figure 5 This is a schematic diagram of the first embodiment of the tortuous strip-shaped basic element in Embodiment 1 of the present invention;

[0038] Figure 6 This is a schematic diagram of the second embodiment of the tortuous strip-shaped basic element in Embodiment 1 of the present invention;

[0039] Figure 7 This is a schematic diagram of the third implementation of the tortuous strip-shaped basic element in Embodiment 1 of the present invention;

[0040] Figure 8This is a schematic diagram of the fourth embodiment of the tortuous strip-shaped basic element in Embodiment 1 of the present invention;

[0041] Figure 9 This is a schematic diagram of the fifth implementation of the tortuous strip-shaped basic element in Embodiment 1 of the present invention;

[0042] Figure 10 This is a schematic diagram of the first embodiment of the central support portion in Embodiment 1 of the present invention;

[0043] Figure 11 This is a schematic diagram of a second embodiment of the central support portion in Embodiment 1 of the present invention;

[0044] Figure 12 This is a schematic diagram of a third embodiment of the central support portion in Embodiment 1 of the present invention;

[0045] Figure 13 This is a schematic diagram of the fourth embodiment of the central support part in Embodiment 1 of the present invention;

[0046] Figure 14 This is a schematic diagram of the fifth embodiment of the central support part in Embodiment 1 of the present invention;

[0047] Figure 15 This is a schematic diagram of the structure in Embodiment 1 of the present invention, in which a viscoelastic damping layer and a thermal insulation and sound-absorbing material are applied to the radial support portion.

[0048] Figure 16 This is a schematic diagram of the structure of the central support section filled with thermal insulation and sound absorption material in Embodiment 1 of the present invention.

[0049] Figure 17 This is a schematic diagram of another embodiment of the biomimetic metamaterial structure in Embodiment 1 of the present invention;

[0050] Figure 18 This is a schematic diagram of an embodiment of the low-frequency broadband vibration reduction metastructure device in Embodiment 2 of the present invention;

[0051] Figure 19 This is a schematic diagram of an embodiment of the low-frequency broadband vibration reduction metastructure device in Embodiment 3 of the present invention;

[0052] Figure 20 This is a graph showing the dynamic transmission rate of the biomimetic metamaterial structure in this invention.

[0053] Reference numerals: 1-Support module, 2-Vibration modulation module, 3-Central support, 4-Radial support, 5-Fan-shaped area, 6-Zigzag strip-shaped element, 7-Corner support device, 8-Outer connecting part, 9-Bionic metamaterial structure, 10-Central connecting part, 11-Viscoelastic damping layer, 12-Thermal insulation and sound absorption material.

[0054] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0056] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0057] Example 1

[0058] like Figure 1 The present embodiment discloses a biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation, which mainly includes a support module 1 and multiple vibration modulation modules 2.

[0059] refer to Figure 2-3 The support module 1 includes a central support 3 and multiple radial support parts 4. The inner ends of each radial support part 4 are connected to the central support 3 and are arranged symmetrically around the center of the central support 3. Adjacent radial support parts 4 form a fan-shaped region 5. In specific applications, the number of radial support parts 4 can be selected according to actual needs; for example, three radial support parts 4 can be used. Figure 2 As shown; or the number of radial support parts 4 can be six, that is Figure 3 As shown.

[0060] refer to Figure 1 and Figure 4 Each arc-shaped region has a vibration modulation module 2. The vibration modulation module 2 includes at least one tortuous strip-shaped element 6, the two ends of which are respectively connected to two adjacent radial support parts 4, and each connection point is located between the inner end and the outer end of the radial support part 4.

[0061] In this embodiment, the tortuous strip-shaped element 6 is a bent beam structure, a curved beam structure, or a straight beam structure, or a combined beam structure of at least two of the following: straight beam, bent beam, and curved beam. In specific applications, the tortuous strip-shaped element 6 can be implemented in various ways, such as... Figure 5-9 As shown:

[0062] refer to Figure 5The first embodiment of the zigzag strip-shaped element 6 is as follows: In this embodiment, the zigzag strip-shaped element 6 is composed of a bent beam in the middle and straight beams at both ends;

[0063] refer to Figure 6 The second implementation of the zigzag strip basic unit 6: In this implementation, the zigzag strip basic unit 6 is composed of several curved beams and straight beams, with the straight beams and curved beams connected alternately in sequence, and the bending direction of each curved beam is the same. Both ends of the zigzag strip basic unit 6 are straight beams.

[0064] refer to Figure 7 The third implementation of the zigzag strip basic unit 6: In this implementation, the zigzag strip basic unit 6 is composed of several curved beams and straight beams, with the straight beams and curved beams connected alternately, and the bending directions of each curved beam are not the same. Both ends of the zigzag strip basic unit 6 are straight beams.

[0065] refer to Figure 8 The fourth implementation of the zigzag strip basic element 6: In this implementation, the zigzag strip basic element 6 is composed of several curved beams, straight beams and bent beams. The straight beams, curved beams and bent beams are distributed intermittently, and the bending direction of each curved beam and the bending direction of the bent beam are the same. Both ends of the zigzag strip basic element 6 are straight beams.

[0066] refer to Figure 9 The fifth implementation of the zigzag strip basic element 6: In this implementation, the zigzag strip basic element 6 is composed of several curved beams, straight beams and bent beams. The straight beams, curved beams and bent beams are distributed intermittently, and the bending direction of each curved beam and the bending direction of each bent beam are not the same. Both ends of the zigzag strip basic element 6 are straight beams.

[0067] It should be noted that, in practice, the implementation of the zigzag strip-shaped basic unit 6 is not limited to... Figure 5-9 The structural form can also be other composite beam structures.

[0068] In the specific implementation process, the biomimetic metamaterial structure also includes corner support devices 7. There are multiple corner support devices 7, which correspond one-to-one with the radial support parts 4. The corner support devices 7 are fixedly connected to the lower part of the outer side of the corresponding radial support part 4 to support the overall structure and provide a connection interface with the outside.

[0069] In the specific implementation process, the neutral axes of each tortuous strip-shaped basic unit 6 are located in the same plane or approximately in the same plane. Specifically, "the neutral axes of each tortuous strip-shaped basic unit 6 are approximately in the same plane" means that the distance between the planes containing the neutral axes is less than 30% of the height of the tortuous strip-shaped basic unit 6.

[0070] In specific implementation, the central support part 3 can be a solid column, beam assembly, rod assembly, or plate assembly, or it can be a combination of beams, rods, and plates. Figure 10-14 As shown. Among them, Figure 10 That is, the central support part 3 of the frustum structure. Figure 11 That is, the central support part 3 of the ring structure. Figure 12 That is, the central support part 3 of the beam-assembly structure. Figure 13 This refers to the central support part 3 of the plate assembly structure. Figure 14 That is, the central support part 3, which is a block structure with an internal cavity.

[0071] In practical implementation, the radial support part 4 is a rod-like structure, such as a rectangular beam, I-beam, T-beam, Z-beam, round tube, square tube, or rectangular tube. It can also be a beam with local reinforcement, a beam with local perforation, or a composite structure, such as a multi-layer composite tube or a lattice sandwich beam.

[0072] In a preferred embodiment, the outer surface of the radial support portion 4 is covered with a viscoelastic damping layer 11 and a thermal insulation and sound-absorbing material 12, i.e. Figure 15 As shown. The interior of the central support 3 is filled with thermal insulation and sound absorption material 12, i.e. Figure 16 As shown, this can further improve the thermal insulation and sound absorption performance of biomimetic metamaterial structures, and help enhance their vibration reduction capabilities.

[0073] In the specific implementation process, the vibration modulation modules 2 in each sector area 5 are arranged in a single layer, a double layer, or a multi-layer arrangement. If the vibration modulation modules 2 are arranged in a double layer or a multi-layer arrangement, the vibration modulation modules 2 in adjacent layers are arranged in a multi-coordinated manner with spatial intersection, frequency band interleaving, and scale coupling.

[0074] In the specific implementation process, within the same sector region 5, the nth zigzag strip-shaped unit 6 has p bends as a whole. n The number of bends in the nth zigzag unit 6 is s. n , where p n s is a positive integer n =p n +1. The p-th bending angle of the nth zigzag strip-shaped basic unit 6 is k. np The arc of the first bend corresponding to the p-th bend of the nth zigzag element 6 is h. np1 The arc of the second bend corresponding to the p-th bend of the nth zigzag element 6 is h. np2 , where 0≤h np1 <π,0≤h np2 <π,0 <k np <π, where the radian corresponding to the straight beam is 0.

[0075] In practical applications, based on changes in application scenarios and objectives, the dimensions, number of bends, bend angle, bend direction, and bend segment radii of the tortuous strip-shaped basic element 6 can be collaboratively designed. The tortuous strip-shaped basic element 6 can be gradient-changed within the corresponding sector region 5, thereby distributively broadening the resonant frequency of each tortuous strip-shaped basic element 6 and enhancing the coupling of load-bearing capacity.

[0076] It is worth noting that the biomimetic metamaterials in this embodiment are not limited to Figure 1 The structural form can also be set as follows: Figure 17 As shown, the zigzag strip-shaped basic element 6 is set as an arc structure, and each zigzag strip-shaped basic element 6 is arranged in a mesh pattern along the central support part 3.

[0077] Example 2

[0078] like Figure 18 This embodiment also discloses a metamaterial device for low-frequency broadband vibration reduction and isolation, which includes m biomimetic metamaterial structures 9 of the above embodiment 1, wherein m ≥ 2. From bottom to top, the central support parts 3 of two adjacent biomimetic metamaterial structures 9 are connected by a central connecting part 10.

[0079] It should be noted that the connections between the various components in the biomimetic metamaterial structure 9 and the metastructure device in this embodiment can be achieved through welding, integral molding, bolt fixing, pin fixing, etc.

[0080] Example 3

[0081] like Figure 19 This embodiment also discloses a metamaterial device for low-frequency broadband vibration reduction and isolation, which includes several biomimetic metamaterial structures 9 of the above embodiment 1.

[0082] When the metamaterial device includes m (m is an odd number and m≥3) biomimetic metamaterial structures 9 as described in Example 1:

[0083] From bottom to top, m biomimetic metamaterial structures 9 are connected in series.

[0084] From bottom to top, the central support part 3 of the w-th biomimetic metamaterial structure 9 is connected to the central support part 3 of the adjacent biomimetic metamaterial structure 9 above it through the central connection part 10, where w is a positive integer and 1≤w≤m-1;

[0085] From bottom to top, the outer periphery of the radial support part 4 of the y-th biomimetic metamaterial structure 9 is connected to the outer periphery of the radial support part 4 of the adjacent biomimetic metamaterial structure 9 above it (corresponding to the position of the corner support device 7) through the outer periphery connection part 8, where y is a positive integer and 2≤y≤m-1.

[0086] When the metamaterial device includes t (t is an even number, and t ≥ 2 of the biomimetic metamaterial structures 9 described in Example 1):

[0087] From bottom to top, t biomimetic metamaterial structures 9 are connected in series.

[0088] From bottom to top, the central support part 3 of the s-th biomimetic metamaterial structure 9 is connected to the central support part 3 of the adjacent biomimetic metamaterial structure 9 above it through the central connecting part 10, where s is an odd number and 1≤s≤t-1.

[0089] From bottom to top, the outer periphery of the radial support portion 4 of the h-th biomimetic metamaterial structure 9 is connected to the outer periphery of the radial support portion 4 of the adjacent biomimetic metamaterial structure 9 above it (corresponding to the position of the corner support device 7) through the outer periphery connecting portion 8, where h is an even number, and h <t。

[0090] It should be noted that the connections between the various components in the biomimetic metamaterial structure 9 and the metastructure device in this embodiment can be achieved through welding, integral molding, bolt fixing, pin fixing, etc.

[0091] The following detailed description, with specific examples, illustrates the biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation provided by this invention.

[0092] In this example, the biomimetic metamaterial structure radiates outward from the central support 3, forming eight symmetrical, spiderweb-like radial supports 4. Each pair of adjacent radial supports 4 encloses a fan-shaped region 5, within which is a set of vibration modulation modules 2. Each vibration modulation module 2 is connected by 12 zigzag strip-shaped elements 6 of increasing length, each element being a curved beam structure. The radial supports 4 are designed as I-beams. All structures are made of PLA (polylactic acid). The vibration transmission characteristics of this structure were calculated, and its vibration transmissibility curve is shown below. Figure 20 As shown; from Figure 20 It can be seen that the structure has a significant vibration suppression effect in the 1465Hz-8000Hz frequency range, with an average vibration transmission attenuation of more than 38.7dB.

[0093] The principles and effects of the biomimetic metamaterial structure and metastructure device in this invention are as follows:

[0094] 1. High load-bearing capacity, small size:

[0095] On the one hand, the spiderweb-like design utilizes its unique geometry to balance the pressure and tension of the entire device. When subjected to external loads, the force is distributed along the spiderweb-like contour to the entire surface of the device, effectively balancing pressure and tension, preventing damage from localized overload, and improving load-bearing capacity. On the other hand, the central support 3, serving as a load-bearing component, effectively expands its load-bearing range through the radial support 4, the localized stiffness reinforcement of the central support 3, and the synergistic enhancement of the connection interface, further enhancing the platform's load-bearing capacity. Furthermore, the spiderweb-like leg-like structure of the microstructure units, with its curved and bent designs, compresses space, helping to reduce structural dimensions and improve space utilization.

[0096] 2. Low frequency, broadband:

[0097] On the one hand, every two adjacent radial support parts 4 of the beam-like structure are connected to the central support part 3 to form a fan-shaped region 5. The microstructure unit is a spider silk-like rod structure (i.e., a tortuous strip-shaped element 6). Each microstructure unit is connected to two adjacent radial support parts 4 of the beam-like structure within the fan-shaped region 5. By adjusting the rod diameter, length, arc angle and direction, or changing the number of bends and angles of the rod, the resonant frequency of the microstructure unit can be designed to the target low frequency. When subjected to external load excitation, the vibration signal of the corresponding target frequency will excite the resonant mode of the microstructure unit, causing the rod to vibrate violently and dissipate the vibration energy in the form of heat, thereby inhibiting the propagation of vibration energy to the central support part 3 and achieving the purpose of low-frequency vibration reduction and isolation. On the other hand, by designing the rod length to gradually change within the fan-shaped region 5 and coordinating the adjustment of parameters such as rod diameter and bending angle, the resonant frequency of the microstructure unit can be distributed and broadened, significantly expanding the vibration reduction and isolation frequency band of the platform system.

[0098] 3. Easy to process and adjustable:

[0099] The designed high-performance vibration reduction and isolation metamaterial device with spider web-like structure has a simple overall structure, is easy to process, and is convenient for engineering applications. At the same time, the device has many adjustable parameters and can be quickly adjusted and improved according to actual control needs. Furthermore, it can be combined with artificial intelligence technology to achieve intelligent design and control.

[0100] In specific applications, based on different application scenarios, various construction schemes can be evolved from the initial microstructural unit, including: protruding arc-shaped microstructural unit, concave arc-shaped microstructural unit, single-bending microstructural unit, multi-bending microstructural unit, and other vibration reduction and isolation platform schemes.

[0101] This invention, positioned beneath precision instruments in modern high-end equipment, effectively reduces overall vibration during operation, lowering the failure and damage rates, and significantly improving stability, accuracy, and reliability. It achieves low-frequency, ultra-wideband vibration reduction and isolation performance while maintaining high rigidity, high strength, and other high load-bearing capabilities. The platform is thin and compact, offering ample design flexibility and modular customization.

[0102] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation, characterized in that, Includes a support module and a vibration modulation module; The support module includes a central support part and multiple radial support parts. The inner ends of each radial support part are connected to the central support part and are arranged in an axisymmetric and periodic manner around the center of the central support part. A fan-shaped area is formed between two adjacent radial support parts. The vibration modulation modules are multiple and correspond one-to-one with the sector regions, and the vibration modulation modules are located within the corresponding sector regions; The vibration modulation module includes at least one tortuous strip-shaped element, the two ends of which are respectively connected to two adjacent radial support portions, and each connection point is located between the inner end and the outer end of the radial support portion. The tortuous strip-shaped basic element is a bent beam structure, a curved beam structure, or a combined beam structure of at least two types of beams, namely straight beams, bent beams, and curved beams; It also includes corner support devices, and there are multiple corner support devices, each corresponding to one of the radial support parts; the corner support devices are fixedly connected to the lower part of the outer side of the corresponding radial support part. The neutral axes of each of the aforementioned tortuous strip-shaped basic units are located in the same plane or approximately in the same plane.

2. The biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation according to claim 1, characterized in that, The central support is a solid column, beam assembly, rod assembly, or plate assembly, or the central support is an assembly of beams, rods, and plates. The radial support is a rod-like structure, or a beam-like structure with local reinforcing ribs and / or local perforations, or a composite structure.

3. The biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation according to claim 1, characterized in that, The outer surfaces of the central support and the radial support are both covered with a viscoelastic damping layer. The radial support is filled with heat-insulating and sound-absorbing materials.

4. The biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation according to claim 1, characterized in that, The vibration modulation modules in each of the aforementioned sector-shaped regions are arranged in a single layer, a double layer, or a multi-layer arrangement; If the vibration modulation module is arranged in two or more layers, the vibration modulation modules in adjacent layers are arranged in a multi-coordinated manner with spatial intersection, frequency band interleaving, and scale coupling.

5. The biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation according to claim 1, characterized in that, Within the same sector-shaped region, the nth zigzag strip-shaped unit has p bends. n The number of bends in the nth meandering strip-shaped unit is s. n , where p n s is a positive integer n =p n +1.

6. The biomimetic metamaterial structure for low-frequency broadband vibration reduction and isolation according to claim 1, characterized in that, Within the same sector-shaped region, the p-th bending angle of the nth tortuous strip-shaped element is k. np The arc of the first bend corresponding to the p-th bend of the nth zigzag element is h. np1 The arc of the second bend corresponding to the p-th bend of the nth zigzag element is h. np2 , of which 0 <h np1 <π,0 <h np2 <π,0 <k np <π.

7. A metastructure device for low-frequency broadband vibration isolation, characterized in that, Includes m biomimetic metamaterial structures as described in any one of claims 1 to 6; From bottom to top, m of the biomimetic metamaterial structures are connected in series, where m is an odd number and m≥3; From bottom to top, the central support of the w-th biomimetic metamaterial structure is connected to the central support of the adjacent biomimetic metamaterial structure above it through a central connection, where w is a positive integer and 1≤w≤m-1; From bottom to top, the outer periphery of the radial support portion of the y-th biomimetic metamaterial structure is connected to the outer periphery of the radial support portion of the adjacent biomimetic metamaterial structure above it through an outer periphery connection portion, where y is a positive integer and 2≤y≤m-1.

8. A metastructure device for low-frequency broadband vibration reduction, characterized in that, Includes the biomimetic metamaterial structure as described in any one of claims 1 to 6; From bottom to top, t of the biomimetic metamaterial structures are connected in series, where t is an even number and t≥2; From bottom to top, the central support of the s-th biomimetic metamaterial structure is connected to the central support of the adjacent biomimetic metamaterial structure above it through a central connecting part, where s is an odd number and 1≤s≤t-1; From bottom to top, the outer periphery of the radial support portion of the h-th biomimetic metamaterial structure is connected to the outer periphery of the radial support portion of the adjacent biomimetic metamaterial structure above it via an outer periphery connecting portion, where h is an even number, and h <t。

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