High-stiffness and high-damping local resonance units for constructing acoustic metamaterial structures

Abstract

The present invention belongs to the field of vibration and noise control, and discloses a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure, comprising a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a support and protection structure 4, and a vibrator unit 5. The vibrator elastic element 1 is tightly connected to one end of the vibrator rigid element 2, and the other end of the vibrator rigid element 2 is tightly connected to the vibrator elastic element 3. The connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the support and protection structure 4, and together constitute a vibrator unit 5. The vibrator unit 5 can take into account the performance of high stiffness and high damping at the same time, and can generate a variety of coupling resonance modes in the low frequency band. By designing the vibrator unit 5 or changing its installation state or combination mode, its low-frequency resonance frequency band can be effectively broadened. The present invention has important application prospects in vibration reduction and noise reduction of modern equipment.

Description

Technical Field

[0001] The invention belongs to the field of vibration and noise control, and relates to a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure. Background Art

[0002] Acoustic metamaterial structure refers to a new type of acoustic structure composed of specially designed artificial acoustic microstructure units (such as local resonance units, referred to as oscillator units or oscillators) periodically embedded inside an elastic structure or attached to its surface. It can obtain extraordinary physical properties that natural materials do not have (such as negative mass density, negative modulus, etc.), and can achieve extraordinary manipulation of elastic waves and sound waves, making it have very considerable application prospects in many fields, such as vibration and noise reduction, acoustic cloaks, acoustic imaging, acoustic screening, etc.

[0003] Artificial acoustic microstructure units are the basic units for constructing acoustic metamaterial structures, which directly affect the performance of the extraordinary physical properties of acoustic metamaterial structures. The most representative artificial acoustic microstructure unit is the local resonance unit, and its traditional designs mainly include spring mass oscillator, hard-soft material block oscillator, thin film concentrated mass oscillator, thin-layer cantilever beam oscillator, etc. These local resonance units (abbreviated as oscillator units or oscillators) have many advantages, but also have some disadvantages. For example, the overall stiffness and damping performance of these oscillator units are usually determined by softer elastic elements / materials, making it difficult to take into account both high stiffness and high damping performance at the same time, and the practical application is limited; in addition, under the action of external loads or loads, the low-frequency resonance performance of these oscillators is often difficult to maintain, and the stability, reliability and environmental tolerance are also reduced, which is not conducive to practical application; in addition, these oscillators usually only have a single coupling resonance mode of a specific frequency in the low-frequency range, so they can generally only suppress a single elastic wave mode of a specific low frequency. On the other hand, these vibrators have the disadvantage of weak resistance to external interference. Take the typical application of vibration and noise reduction in aircraft cabins as an example: these vibrators are generally directly attached to the aircraft cabin wall to reduce vibration and noise. The contact surface with the cabin wall is small, and no good protective measures are taken. When foreign objects touch the vibrator (such as the insulation material layer and decorative layer on the inside of the aircraft cabin wall contacting the vibrator) or the vibrator is strongly excited (the aircraft takes off, lands, and passes through the clouds). The severe turbulence), it will directly affect the vibration and noise reduction performance of the vibrator, and even cause the vibrator to fall off, resulting in the failure of the vibration and noise reduction performance of the vibrator. These defects and deficiencies undoubtedly limit the application of traditional artificial acoustic microstructure units in the construction of acoustic metamaterial structures.

[0004] The present invention draws on the innovative design concept of acoustic metamaterial structures and comprehensively applies high-rigidity structures, high-damping materials, etc. to the design of artificial acoustic microstructure units, so that the oscillator has both high stiffness and high damping performance, and generates multiple coupling resonance modes, and significantly improves the protection capability of the oscillator, overcoming the defects of traditional artificial acoustic microstructure units such as poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities. The prior art does not disclose the high-rigidity and high-damping local resonance unit used to construct the acoustic metamaterial structure in the present invention. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the above-mentioned background technology and to provide a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure. The local resonance unit can take into account the performance of high stiffness and high damping at the same time, can produce a variety of coupled resonance modes in the low-frequency band, and also has a strong protection function. In addition, the function of widening the low-frequency resonance band can be achieved by only changing the installation and arrangement of the vibrator without changing the structural form, material parameters and connection relationship between the internal components of the vibrator, thereby overcoming the defects of traditional artificial acoustic microstructure units such as poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure, wherein the local resonance unit comprises a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a supporting and protective structure 4, and a vibrator unit 5.

[0008] The vibrator elastic element 1 is tightly connected to one end of the vibrator rigid element 2, and the other end of the vibrator rigid element 2 is tightly connected to the vibrator elastic element 3. The connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the support and protection structure 4, and together constitute a vibrator unit 5. The vibrator unit 5 can take into account the performance of high stiffness and high damping at the same time, can generate a variety of coupling resonance modes in the low frequency band, and also has a strong protection function. In addition, by designing the vibrator unit 5 or changing its installation state or combination mode, its low-frequency resonance frequency band can be effectively broadened, overcoming the defects of poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band of traditional artificial acoustic microstructure units.

[0009] Furthermore, the number of the vibrator elastic elements 1 connected to one end of the vibrator rigid element 2 can be one, two or more, the number of the vibrator elastic elements 3 connected to the other end of the vibrator rigid element 2 can be one, two or more, and the number of the vibrator elastic elements 1 and the vibrator elastic elements 3 can be the same or different.

[0010] Furthermore, the structural forms of the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 may be columnar, annular or a combination, and their cross-sectional shapes may be triangular, circular, annular or rectangular; the connecting contact parts between the vibrator elastic element 1, the vibrator elastic element 3 and the vibrator rigid element 2 may be the end faces or side faces of the vibrator elastic element 1, the vibrator elastic element 3.

[0011] Furthermore, the support and protection structure 4 plays the role of supporting and protecting the vibrator unit 5, and can be fully enclosed or semi-enclosed. Its structural form is a cylindrical shell, preferably a cylindrical shell or a square prism shell. The outer shape of the cylindrical shell can be circular, square, rectangular, triangular, or polygonal. The shell wall of the support and protection structure 4 can be a solid wall, a perforated wall, or a slit wall. The shell wall of the support and protection structure 4 can be partially provided with reinforcing ribs, reinforcing ribs, and auxiliary structures of their combination.

[0012] Furthermore, the vibrator elastic element 1 and the vibrator elastic element 3 can be made of high damping material or medium and low damping material, preferably rubber, silicone, metal rubber, and spring; the vibrator rigid element 2 can be made of metal material or non-metallic material, preferably steel, iron, copper, plexiglass, magnet, and stone; the support and protection structure 4 can be made of metal material or non-metallic material, preferably steel, aluminum, copper, plexiglass, PVC, wood, composite materials, and laminated materials.

[0013] Furthermore, the vibrator unit 5 is in the form of a single vibrator, and each vibrator unit 5 has a corresponding low-frequency resonance mode along three orthogonal directions, which can simultaneously couple with the longitudinal wave and transverse wave modes propagating in various directions in the matrix structure; further, the vibrator unit 5 is designed to have different resonance frequencies in different directions, thereby achieving effective suppression of elastic waves at different frequencies; the vibrator unit 5 has an installation state (installation direction) along three orthogonal directions, and changing these three installation states of the vibrator unit 5 in turn can make the low-frequency resonance mode in the corresponding installation state direction couple with the elastic wave in the matrix structure in turn, thereby achieving suppression of elastic waves of different frequencies by selecting different installation states.

[0014] Furthermore, the vibrator unit 5 may be in the form of a parallel, series or series-parallel combination vibrator, and the parameters of the individual vibrator units constituting the combined vibrator may be the same or different. The low-frequency resonance frequency band of the vibrator unit 5 can be significantly broadened by adjusting various combined installation states of the combined vibrator without changing the structural form, material parameters and connection relationship between the internal components of the vibrator.

[0015] Furthermore, the internal structure of the vibrator unit 5 is isolated and decoupled from the outside world through the support and protection structure 4, and its intrinsic characteristics are not affected by the outside world, and it has a strong protection function.

[0016] Furthermore, the overall stiffness of the vibrator unit 5 is relatively large, and high damping materials can be selected to prepare the vibrator elastic elements 1 and 3, so that the vibrator unit 5 has both high stiffness and high damping characteristics, and the low-frequency resonance band of the vibrator unit 5 can be significantly broadened by utilizing the damping characteristics.

[0017] Furthermore, the vibrator unit 5 can be periodically or non-periodically applied to the surface of the base structure, or embedded inside the base structure for use.

[0018] The present invention has the following technical effects: the present invention is used to construct an acoustic metamaterial structure, and provides a high-rigidity and high-damping local resonance unit for constructing the acoustic metamaterial structure. The local resonance unit can take into account the performance of high stiffness and high damping at the same time, and generates a variety of coupling resonance modes in the low-frequency band, and also has a strong protection function. In addition, without changing the structural form, material parameters and connection relationship between the internal components of the vibrator, the low-frequency resonance frequency band of the vibrator unit can be significantly broadened by adjusting various combined installation states of the combined vibrator, thereby overcoming the defects of traditional artificial acoustic microstructure units such as poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the cross-sectional shape of the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 of the present invention;

[0021] Figure 3 It is a schematic diagram of the structural form of the support and protection structure 4 of the present invention;

[0022] Figure 4 It is a schematic diagram of the combination form of the vibrator unit 5 of the present invention;

[0023] Figure 5A schematic diagram of the installation direction of the vibrator unit of the present invention;

[0024] Figure 6 It is a schematic diagram of the arrangement of the vibrator unit of the present invention;

[0025] Figure 7 This is a diagram showing the effect of suppressing elastic wave vibration by the acoustic metamaterial plate constructed with the local resonance unit of the present invention. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further explained below in conjunction with the accompanying drawings, exemplary embodiments and their descriptions.

[0027] The purpose of the present invention is to solve the problems existing in the above-mentioned background technology and to provide a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure. The local resonance unit can take into account the performance of high stiffness and high damping at the same time, can produce a variety of coupled resonance modes in the low-frequency band, and also has a strong protection function. In addition, it can achieve the function of widening the low-frequency resonance band by only changing the installation and arrangement of the vibrator without changing the structural form, material parameters and connection relationship between the internal components of the vibrator, thereby overcoming the defects of traditional artificial acoustic microstructure units such as poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band.

[0028] See also Figure 1 The present invention provides a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure. The local resonance unit includes a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a support and protection structure 4, and a vibrator unit 5.

[0029] Preferably, the vibrator elastic element 1 is tightly connected to one end of the vibrator rigid element 2, and the other end of the vibrator rigid element 2 is tightly connected to the vibrator elastic element 3. The connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the support and protection structure 4, and together constitute a vibrator unit 5. The vibrator unit 5 can take into account the performance of high stiffness and high damping at the same time, can generate a variety of coupling resonance modes in the low frequency band, and also has a strong protection function. In addition, by designing the vibrator unit 5 or changing its installation state or combination mode, its low-frequency resonance frequency band can be effectively broadened, overcoming the defects of poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band of traditional artificial acoustic microstructure units.

[0030] Preferably, the number of the vibrator elastic elements 1 connected to one end of the vibrator rigid element 2 can be one, two or more, the number of the vibrator elastic elements 3 connected to the other end of the vibrator rigid element 2 can be one, two or more, and the number of the vibrator elastic elements 1 and the vibrator elastic elements 3 can be the same or different.

[0031] Preferably, the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 may be in the form of a column, a ring or a combination, and their cross-sectional shapes may be triangular, circular, annular, rectangular (see Figure 2 ); the connection contact portion of the vibrator elastic element 1, the vibrator elastic element 3 and the vibrator rigid element 2 may be the end surface or side surface of the vibrator elastic element 1, the vibrator elastic element 3.

[0032] Preferably, the support and protection structure 4 plays the role of supporting and protecting the vibrator unit 5, and can be arranged in a fully enclosed or semi-enclosed manner, and its structural form is a cylindrical shell, preferably a cylindrical shell or a square prism shell (see Figure 3 ), the outer shape of the column shell can be circular, square, rectangular, triangular, or polygonal, the shell wall of the supporting and protective structure 4 can be a solid wall, a perforated wall, or a slit wall, and the shell wall of the supporting and protective structure 4 can be partially provided with reinforcing ribs, reinforcing ribs, and auxiliary structures of their combination.

[0033] Preferably, the vibrator elastic element 1 and the vibrator elastic element 3 can be made of high-damping material or medium-low damping material, preferably rubber, silicone, metal rubber, and spring; the vibrator rigid element 2 can be made of metal material or non-metallic material, preferably steel, iron, copper, plexiglass, magnet, and stone; the support and protection structure 4 can be made of metal material or non-metallic material, preferably steel, aluminum, copper, plexiglass, PVC, wood, composite materials, and laminated materials.

[0034] Preferably, the vibrator unit 5 is in the form of a single vibrator (see Figure 4 ), each vibrator unit 5 has a corresponding low-frequency resonance mode along three orthogonal directions, which can simultaneously couple with the longitudinal wave and transverse wave modes propagating in each direction in the base structure; further, by designing the vibrator unit 5, the resonant frequencies of the vibrator unit 5 in different directions are different, thereby achieving effective suppression of elastic waves at different frequencies; the vibrator unit 5 has an installation state (installation direction) along the three orthogonal directions, and the three installation states of the vibrator unit 5 are changed in sequence (see Figure 5 ), which can make the low-frequency resonance mode in the direction of the corresponding installation state couple with the elastic wave in the base structure in turn, so as to suppress the elastic waves of different frequencies by selecting different installation states.

[0035] Preferably, the vibrator unit 5 can be in the form of a parallel, series or series-parallel combination vibrator (see Figure 4 ), the parameters of the various vibrator units constituting the combined vibrator can be the same or different, and the low-frequency resonance frequency band of the vibrator unit 5 can be significantly broadened by only adjusting the various combined installation states of the combined vibrator without changing the structural form, material parameters and connection relationship between the internal components of the vibrator.

[0036] Preferably, the internal structure of the vibrator unit 5 is isolated and decoupled from the outside world through the support and protection structure 4, and its intrinsic characteristics are not affected by the outside world, and it has a strong protection function.

[0037] Preferably, the overall stiffness of the vibrator unit 5 is relatively large, and high damping materials can be selected to prepare the vibrator elastic elements 1 and 3, so that the vibrator unit 5 has both high stiffness and high damping characteristics, and the low-frequency resonance band of the vibrator unit 5 can be significantly broadened by utilizing the high damping characteristics.

[0038] Preferably, the vibrator unit 5 can be periodically or non-periodically applied to the surface of the base structure, or embedded in the base structure for use (see Figure 6 ).

[0039] The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure provided by the present invention is described in detail below in conjunction with specific embodiments.

[0040] See also Figure 1 The present invention provides a high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure includes a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a support and protection structure 4, and a vibrator unit 5.

[0041] The vibrator elastic element 1 is tightly connected to one end of the vibrator rigid element 2, and the other end of the vibrator rigid element 2 is tightly connected to the vibrator elastic element 3. The connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the support and protection structure 4, and together constitute a vibrator unit 5. The vibrator unit 5 can take into account the performance of high stiffness and high damping at the same time, can generate a variety of coupling resonance modes in the low frequency band, and also has a strong protection function. In addition, by designing the vibrator unit 5 or changing its installation state or combination mode, its low-frequency resonance frequency band can be effectively broadened, overcoming the defects of poor stiffness-damping comprehensive performance, weak anti-interference and protection capabilities, and narrow action frequency band of traditional artificial acoustic microstructure units.

[0042] Embodiment 1:

[0043] The local resonance unit adopts a single vibrator form, and the vibrator elastic element 1 and the vibrator elastic element 3 are cylindrical in structure, with a circular cross-sectional shape, and a diameter and thickness of 8mm×7.6mm; the vibrator rigid element 2 is cylindrical in structure, with a circular cross-sectional shape, and a diameter and thickness of 27mm×5mm; the support and protection structure 4 adopts a cylindrical shell, the outer diameter and height of the shell are 32mm×20mm respectively, and the thickness of the shell is 1mm; the vibrator elastic element 1 and the vibrator elastic element 3 are made of silicone rubber, the vibrator rigid element 2 is made of stainless steel, the support and protection structure 4 is made of PAL, and the total weight of a vibrator unit is about 30g. The above-mentioned local resonance units are periodically arranged on a reinforced wall panel with a length, width and thickness of 850mm×850mm×2.5mm to form a metamaterial reinforced wall panel structure. The arranged lattice size is 60mm. An axial end face of the vibrator elastic element 1 is connected to the vibrator rigid structure 2, and an axial end face of the vibrator elastic element 3 is connected to the vibrator rigid structure 2. The fixed installation surface of the vibrator unit 5 adopts a surface perpendicular to the axial direction of the vibrator. The connection method adopts bonding, and the reinforced wall panel is made of aluminum.

[0044] Embodiment 2:

[0045] The parameters of the vibrator unit 5 of the second embodiment are the same as those of the first embodiment. The fixed installation surface of the vibrator unit 5 is respectively a circumferential surface of the vibrator and a surface perpendicular to the axial direction of the vibrator.

[0046] The vibration reduction effect of the structure in the preferred embodiment 1 of the present invention is shown in FIG. Figure 7 It can be seen that the metamaterial plate structure of the vibrator structure of the present invention produces a good vibration suppression effect, and the average attenuation of the longitudinal wave vibration within 100Hz-1000Hz exceeds 10dB, wherein the average attenuation of the longitudinal wave vibration within 280Hz-500Hz exceeds 20dB. From the resonance mode of the vibrator unit 5 in the preferred embodiment 2 of the present invention, it can be known that: when the surface perpendicular to the axial direction of the vibrator is used as the fixed installation surface, the vibrator unit 5 has a transverse wave coupling resonance at 154Hz, and two longitudinal wave coupling resonances in mutually perpendicular directions at 341Hz; when the circumferential surface of the vibrator is used as the fixed installation surface, the vibrator has a transverse wave coupling resonance at 341Hz, and two longitudinal wave coupling resonances in mutually perpendicular directions at 154Hz, that is, by adjusting the installation direction of the vibrator, the low-frequency resonance mode in the direction of the corresponding installation state can be coupled with the elastic wave in the fixed surface structure in turn, so that the suppression of elastic waves of different frequencies can be achieved by selecting different installation states.

[0047] The above is only one of the preferred specific implementations of the present invention, but the protection scope of the present invention is not limited thereto. Various modifications or other embodiments with the same arrangement that can be easily obtained by relevant technicians in the field based on or referring to the idea of ​​the present invention belong to the protection scope of the present invention.

Claims

1. A high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure, comprising a vibrator elastic element A (1), a vibrator rigid element (2), a vibrator elastic element B (3), a supporting and protective structure (4), and a vibrator unit (5), characterized in that: The vibrator elastic element A (1) is tightly connected to one end of the vibrator rigid element (2), and the other end of the vibrator rigid element (2) is tightly connected to the vibrator elastic element B (3). The connected vibrator elastic element A (1), the vibrator rigid element (2) and the vibrator elastic element B (3) are tightly arranged together in the supporting and protective structure (4), and together form a vibrator unit (5); The vibrator unit (5) is in the form of a single vibrator, and each vibrator unit (5) has a corresponding low-frequency resonance mode along three orthogonal directions, which can simultaneously couple with longitudinal wave and transverse wave modes propagating in various directions in the base structure; the vibrator unit (5) is designed so that the resonance frequencies of the vibrator unit (5) in different directions are different, thereby achieving effective suppression of elastic waves at different frequencies; the vibrator unit (5) has an installation state along the three orthogonal directions, and by sequentially changing the three installation states of the vibrator unit (5), the low-frequency resonance modes in the corresponding installation state directions can be sequentially coupled with the elastic waves in the base structure, thereby achieving suppression of elastic waves at different frequencies by selecting different installation states.

2. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The number of the vibrator elastic elements A (1) connected to one end of the vibrator rigid element (2) may be one, two or more, the number of the vibrator elastic elements B (3) connected to the other end of the vibrator rigid element (2) may be one, two or more, and the number of the vibrator elastic elements A (1) and the number of the vibrator elastic elements B (3) may be the same or different.

3. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The structures of the vibrator elastic element A (1), the vibrator rigid element (2) and the vibrator elastic element B (3) are either columnar, annular or a combination, and their cross-sectional shapes are either triangular, circular, annular or rectangular; the connection contact parts of the vibrator elastic element A (1), the vibrator elastic element B (3) and the vibrator rigid element (2) are either the end faces or the side faces of the vibrator elastic element A (1) and the vibrator elastic element B (3).

4. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The support and protection structure (4) plays the role of supporting and protecting the vibrator unit (5), and is either fully enclosed or semi-enclosed. Its structural form is a cylindrical shell, or a cylindrical shell or a square prism shell. The outer shape of the cylindrical shell is circular, square, rectangular, triangular or polygonal. The shell wall of the support and protection structure (4) is either a solid wall, a perforated wall or a slit wall. The shell wall of the support and protection structure (4) is partially provided with reinforcing ribs, or reinforcing ribs and auxiliary structures of their combination.

5. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The vibrator elastic element A (1) and the vibrator elastic element B (3) are made of high damping material or medium and low damping material, or rubber, or silicone, or metal rubber, or spring; the vibrator rigid element (2) is made of metal material or non-metal material, or steel, or iron, or copper, or organic glass, or magnet, or stone; the support and protection structure (4) is made of metal material or non-metal material, or steel, or aluminum, or copper, or organic glass, or PVC, or wood, or composite material, or laminated material.

6. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The vibrator units (5) are in the form of parallel, series or series-parallel combination vibrators, and the parameters of the individual vibrator units constituting the combination vibrator are either the same or different. The low-frequency resonance frequency band of the vibrator units (5) can be significantly widened by adjusting various combination installation states of the combination vibrator without changing the structural form, material parameters and connection relationship between the internal components of the vibrator.

7. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The internal structure of the vibrator unit (5) is isolated and decoupled from the outside world through the support and protection structure (4), and its intrinsic characteristics are not affected by the outside world, and it has a strong protection function.

8. The high-rigidity and high-damping local resonance unit for constructing an acoustic metamaterial structure according to claim 1, characterized in that: The vibrator unit (5) is applied to the surface of the base structure periodically or non-periodically, or embedded inside the base structure for use.

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