CN110751937A - High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure - Google Patents
High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure Download PDFInfo
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- CN110751937A CN110751937A CN201911104852.4A CN201911104852A CN110751937A CN 110751937 A CN110751937 A CN 110751937A CN 201911104852 A CN201911104852 A CN 201911104852A CN 110751937 A CN110751937 A CN 110751937A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
Abstract
The invention belongs to the field of vibration and noise control, and discloses a high-rigidity high-damping local resonance unit for constructing an acoustic metamaterial structure, which comprises a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a supporting and protecting structure 4 and a vibrator unit 5. The vibrator elastic element 1 is fixedly connected with one end of the vibrator rigid element 2, the other end of the vibrator rigid element 2 is fixedly connected with the vibrator elastic element 3, and the connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the supporting and protecting structure 4 together to form a vibrator unit 5. The vibrator unit 5 can simultaneously give consideration to the performances of high rigidity and high damping, can generate various coupling action resonance modes in a low-frequency band, and can effectively widen the low-frequency resonance frequency band of the vibrator unit 5 by designing the vibrator unit or changing the installation state or the combination mode of the vibrator unit.
Description
Technical Field
The invention belongs to the field of vibration and noise control, and relates to a high-rigidity high-damping local resonance unit for constructing an acoustic metamaterial structure.
Background
The acoustic metamaterial structure is a novel acoustic structure formed by periodically embedding an artificial acoustic microstructure unit (such as a local resonance unit, a vibrator unit or a vibrator for short) which is specially designed into an elastic structure or attaching the artificial acoustic microstructure unit to the surface of the elastic structure, can obtain extraordinary physical characteristics (such as negative mass density, negative modulus and the like) which natural materials do not have, and can realize extraordinary operation and control of elastic waves and sound waves, so that the acoustic metamaterial structure has quite considerable application prospects in numerous fields, such as vibration and noise reduction, acoustic cloaks, acoustic imaging, acoustic sieves and the like.
The artificial acoustic microstructure units are basic units for constructing the acoustic metamaterial structure, and directly influence the exertion of the extraordinary physical properties of the acoustic metamaterial structure. The most representative artificial acoustic microstructure unit is a local resonance unit, and the traditional design mainly comprises a spring mass vibrator, a hard and soft material block vibrator, a film concentrated mass vibrator, a thin-layer cantilever beam type vibrator and the like. These local resonance units (referred to as vibrator units or vibrators for short) have many advantages, but also have some disadvantages, such as: the overall rigidity and damping performance of the vibrator units are usually determined by softer elastic elements/materials, so that the vibrator units are difficult to simultaneously consider the performances of high rigidity and high damping, and the practical application is limited; in addition, the low-frequency resonance performance of the vibrators under the action of external loads or loads is often difficult to maintain, and the stability, reliability and environmental tolerance are reduced, so that the vibrators are not beneficial to practical application; in addition, these transducers usually have only a single coupling resonance mode at a specific frequency in a low frequency range, and therefore can generally suppress only a single elastic wave mode at a specific low frequency. On the other hand, these vibrators have the disadvantage of weak external interference resistance, for example, the typical application of vibration damping and noise reduction in an aircraft cabin is as follows: the vibrators are generally directly attached and mounted on the wall of an aircraft cabin to reduce vibration and noise, the contact surface of the vibrators and the cabin wall is small, good protective measures are not adopted, and when foreign objects touch the vibrators (such as a heat insulation material layer and a decorative layer on the inner side of the wall of the aircraft cabin touch the vibrators) or the vibrators are strongly excited (such as violent jolt during takeoff, landing and cloud layer crossing of the aircraft), the performance of the vibration reduction and noise reduction of the vibrators can be directly influenced, and even the vibrators fall off to cause the failure of the vibration reduction and noise reduction of the vibrators. These drawbacks and deficiencies clearly limit the application of conventional artificial acoustic microstructure units in the construction of acoustic metamaterial structures.
The invention refers to the innovative design concept of the acoustic metamaterial structure, comprehensively applies a high-rigidity structure, a high-damping material and the like to the design of the artificial acoustic microstructure unit, enables the vibrator to have high rigidity and high damping performance simultaneously, enables the vibrator to generate a plurality of resonance modes for coupling, obviously improves the protection capability of the vibrator, overcomes the defects of poor rigidity-damping comprehensive performance, poor interference resistance, weak protection capability and the like of the traditional artificial acoustic microstructure unit, and does not disclose the high-rigidity high-damping local resonance unit for constructing the acoustic metamaterial structure in the prior art.
Disclosure of Invention
The invention aims to solve the problems in the background technology, and provides a high-rigidity high-damping local resonance unit for constructing an acoustic metamaterial structure, wherein the local resonance unit can simultaneously give consideration to high rigidity and high damping performance, can generate multiple coupling action resonance modes in a low frequency band, and has a strong protection function.
In order to achieve the purpose, the invention adopts the technical scheme that:
the high-rigidity high-damping local resonance unit is used for constructing an acoustic metamaterial structure and comprises a vibration elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a supporting and protecting structure 4 and a vibrator unit 5.
The vibrator elastic element 1 is fixedly connected with one end of the vibrator rigid element 2, the other end of the vibrator rigid element 2 is fixedly connected with the vibrator elastic element 3, and the connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the supporting and protecting structure 4 together to form a vibrator unit 5. The vibrator unit 5 can simultaneously give consideration to high rigidity and high damping performance, can generate multiple coupling action resonance modes in a low frequency band, and has a strong protection function.
Further, the number of the vibrator elastic element 1 connected to one end of the vibrator rigid element 2 may be one, two or more, the number of the vibrator elastic element 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 element 1 and the number of the vibrator elastic element 3 may be the same or different.
Further, the structural form of the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 can be columnar, annular or combined, and the cross section of the vibrator elastic element can be triangular, circular or rectangular; the connection contact portion between the vibrator elastic element 1, the vibrator elastic element 3, and the vibrator rigid element 2 may be an end face or a side face of the vibrator elastic element 1 or the vibrator elastic element 3.
Further, the supporting and protecting structure 4 plays a role of supporting and protecting the vibrator unit 5, and may be configured in a fully-enclosed or semi-enclosed manner, and has a structural form of a cylindrical shell, preferably a cylindrical shell or a square-prism shell, the peripheral shape of the cylindrical shell may be a circle, a square, a rectangle, a triangle, or a polygon, the shell wall of the supporting and protecting structure 4 may be a solid wall, a perforated wall, or a perforated wall, and the local part of the shell wall of the supporting and protecting structure 4 may be configured with a reinforcing rib, and an auxiliary structure of a combination thereof.
Further, the oscillator elastic element 1 and the oscillator elastic element 3 can be made of high damping materials or medium and low damping materials, preferably rubber, silica gel, metal rubber and springs; the vibrator rigid element 2 can be made of metal materials or non-metal materials, preferably steel, iron, copper, machine glass, magnets and stone materials; the support and protection structure 4 can be made of metallic or non-metallic material, preferably steel, aluminium, copper, perspex, PVC, wood, composite, laminate.
Furthermore, the vibrator units 5 are in a single vibrator form, and each vibrator unit 5 has a low-frequency resonance mode corresponding to the vibrator unit along three orthogonal directions, and can generate coupling action with longitudinal wave and transverse wave modes propagating in all directions in the base structure; furthermore, the resonant frequencies of the vibrator unit 5 in different directions are different by designing the vibrator unit 5, so that the elastic waves under different frequencies are effectively inhibited; the vibrator unit 5 has a mounting state (mounting direction) along three orthogonal directions, and the three mounting states of the vibrator unit 5 are sequentially changed, so that the low-frequency resonance mode in the corresponding mounting state direction can be sequentially coupled with the elastic waves in the base structure, and the suppression of the elastic waves with different frequencies is realized by selecting different mounting states.
Further, the vibrator unit 5 may be in a parallel, series, or series-parallel combined vibrator form, and parameters of the respective vibrator units constituting the combined vibrator may be the same or different, and the low-frequency resonance band of the vibrator unit 5 can be significantly widened only by adjusting various combined installation states of the combined vibrator without changing the structural form, material parameters, and connection relationship between internal elements of the vibrator.
Furthermore, the internal structure of the vibrator unit 5 is isolated and decoupled from the outside through the support and protection structure 4, the characteristic characteristics of the vibrator unit are not affected by the outside, and the vibrator unit has a strong protection function.
Further, the oscillator unit 5 has a relatively high overall stiffness, and the oscillator elastic element 1 and the oscillator elastic element 3 can be made of a high-damping material, so that the oscillator unit 5 has high stiffness and high damping characteristics, and the low-frequency resonance frequency band of the oscillator unit 5 can be remarkably widened by using the damping characteristics.
Further, the vibrator unit 5 may be periodically or non-periodically applied to the surface of the base structure, or embedded in the base structure for use.
The invention has the following technical effects: the invention is used for constructing an acoustic metamaterial structure, provides a high-rigidity high-damping local resonance unit for constructing the acoustic metamaterial structure, can give consideration to high-rigidity and high-damping performances at the same time, generates multiple coupling action resonance modes in a low-frequency band, has a strong protection function, can remarkably widen the low-frequency resonance frequency band of a vibrator unit only by adjusting various combined installation states of combined vibrators under the condition of not changing the structural form, material parameters and connection relation among internal elements of the vibrator, and overcomes the defects of poor rigidity-damping comprehensive performance, weak anti-interference and protection capability, narrow action frequency band and the like of the traditional artificial acoustic microstructure unit.
Drawings
FIG. 1 is a schematic diagram of a high stiffness and high damping local resonance unit for constructing an acoustic metamaterial structure according to the present invention;
fig. 2 is a schematic cross-sectional view of the vibrator elastic element 1, the vibrator rigid element 2, and the vibrator elastic element 3 according to the present invention;
fig. 3 is a schematic view of the support and protection structure 4 according to the invention;
fig. 4 is a schematic view of the combination of the vibrator unit 5 of the present invention;
FIG. 5 is a schematic view showing the mounting direction of the vibrator unit according to the present invention;
FIG. 6 is a schematic diagram of the arrangement of the vibrator unit according to the present invention;
FIG. 7 is a diagram illustrating the effect of the acoustic metamaterial plate constructed with the localized resonance unit of the present invention on suppressing elastic wave vibration.
Detailed Description
In order to make the objects, solutions and advantages of the present invention more clear, the present invention will be further explained with reference to the accompanying drawings, exemplary embodiments and description thereof.
The invention aims to solve the problems in the background technology, and provides a high-rigidity high-damping local resonance unit for constructing an acoustic metamaterial structure, wherein the local resonance unit can simultaneously give consideration to high rigidity and high damping performance, can generate multiple coupling action resonance modes in a low frequency band, and has a very strong protection function.
Referring to fig. 1, the invention provides a high-rigidity 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 protecting structure 4 and a vibrator unit 5.
Preferably, the vibrator elastic element 1 is fastened and connected with one end of the vibrator rigid element 2, the other end of the vibrator rigid element 2 is fastened and connected with the vibrator elastic element 3, and the connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the supporting and protecting structure 4 together to form a vibrator unit 5. The vibrator unit 5 can simultaneously give consideration to high rigidity and high damping performance, can generate multiple coupling action resonance modes in a low frequency band, and has a strong protection function.
Preferably, the number of the vibrator elastic element 1 connected to one end of the vibrator rigid element 2 may be one, two or more, the number of the vibrator elastic element 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 1 and the number of the vibrator elastic elements 3 may be the same or different.
Preferably, the vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 may be in a column shape, a ring shape or a combined form, and the cross-sectional shape thereof may be a triangle, a circle, a circular ring or a rectangle (see fig. 2); the connection contact portion between the vibrator elastic element 1, the vibrator elastic element 3, and the vibrator rigid element 2 may be an end face or a side face of the vibrator elastic element 1 or the vibrator elastic element 3.
Preferably, the supporting and protecting structure 4 functions to support and protect the vibrator unit 5, and may be a fully-enclosed or semi-enclosed structure, which is in the form of a cylindrical shell, preferably a cylindrical shell or a square prism shell (see fig. 3), the outer periphery of the cylindrical shell may be in the shape of a circle, a square, a rectangle, a triangle or a polygon, the wall of the supporting and protecting structure 4 may be a solid wall, a perforated wall or a perforated wall, and the wall of the supporting and protecting structure 4 may be partially provided with reinforcing ribs, reinforcing ribs or an auxiliary structure of a combination thereof.
Preferably, the oscillator elastic element 1 and the oscillator elastic element 3 can be made of a high damping material or a medium damping material, and preferably rubber, silica gel, metal rubber and a spring; the vibrator rigid element 2 can be made of metal materials or non-metal materials, preferably steel, iron, copper, machine glass, magnets and stone materials; the support and protection structure 4 can be made of metallic or non-metallic material, preferably steel, aluminium, copper, perspex, PVC, wood, composite, laminate.
Preferably, the vibrator units 5 are in the form of single vibrators (see fig. 4), and each vibrator unit 5 has a low-frequency resonance mode corresponding to the vibrator unit along three orthogonal directions, and can be coupled with longitudinal wave and transverse wave modes propagating in all directions in the base structure at the same time; furthermore, the resonant frequencies of the vibrator unit 5 in different directions are different by designing the vibrator unit 5, so that the elastic waves under different frequencies are effectively inhibited; the vibrator unit 5 has a mounting state (mounting direction) along three orthogonal directions, and the three mounting states of the vibrator unit 5 are sequentially changed (see fig. 5), so that the low-frequency resonance mode in the corresponding mounting state direction can be sequentially coupled with the elastic wave in the base structure, and the suppression of the elastic wave with different frequencies is realized by selecting different mounting states.
Preferably, the vibrator unit 5 may be in a parallel, series, or series-parallel combined vibrator form (see fig. 4), and parameters of each vibrator unit constituting the combined vibrator may be the same or different, and the low-frequency resonance band of the vibrator unit 5 can be significantly widened by only adjusting various combined installation states of the combined vibrator without changing the structural form, material parameters, and connection relationship between internal elements of the vibrator.
Preferably, the internal structure of the vibrator unit 5 is isolated and decoupled from the outside through the support and protection structure 4, the intrinsic characteristics of the vibrator unit are not affected by the outside, and the vibrator unit has a strong protection function.
Preferably, the oscillator unit 5 has a relatively high overall stiffness, and the oscillator elastic element 1 and the oscillator elastic element 3 can be made of a high-damping material, so that the oscillator unit 5 has both high stiffness and high damping characteristics, and the low-frequency resonance frequency band of the oscillator unit 5 is remarkably widened by using the high damping characteristics.
Preferably, the vibrator unit 5 may be periodically or non-periodically applied to the surface of the base structure or embedded in the base structure (see fig. 6).
The high-rigidity high-damping local resonance unit for constructing the acoustic metamaterial structure provided by the invention is described in detail in the following with reference to specific embodiments.
Referring to fig. 1, the invention provides a high-rigidity high-damping local resonance unit for constructing an acoustic metamaterial structure, and the high-rigidity high-damping local resonance unit for constructing the acoustic metamaterial structure comprises a vibrator elastic element 1, a vibrator rigid element 2, a vibrator elastic element 3, a supporting and protecting structure 4 and a vibrator unit 5.
The vibrator elastic element 1 is fixedly connected with one end of the vibrator rigid element 2, the other end of the vibrator rigid element 2 is fixedly connected with the vibrator elastic element 3, and the connected vibrator elastic element 1, the vibrator rigid element 2 and the vibrator elastic element 3 are tightly arranged in the supporting and protecting structure 4 together to form a vibrator unit 5. The vibrator unit 5 can simultaneously give consideration to high rigidity and high damping performance, can generate multiple coupling action resonance modes in a low frequency band, and has a strong protection function.
The first embodiment is as follows:
the local resonance unit adopts a single vibrator form, the vibrator elastic element 1 and the vibrator elastic element 3 adopt a columnar form in structural forms, the cross section of the vibrator elastic element is circular, and the diameter and the thickness of the vibrator elastic element are 8mm multiplied by 7.6 mm; the vibrator rigid element 2 is in a column shape, the cross section of the vibrator rigid element is circular, and the diameter and the thickness of the vibrator rigid element are 27mm multiplied by 5 mm; the supporting and protecting structure 4 adopts a cylindrical shell, the outer diameter and the height of the shell are respectively 32mm multiplied by 20mm, and the thickness of the shell is 1 mm; the vibrator elastic element 1 and the vibrator elastic element 3 are made of silicon rubber, the vibrator rigid element 2 is made of stainless steel, the supporting and protecting structure 4 is made of PAL, and the total weight of one vibrator unit is about 30 g. The local resonance units are periodically arranged on a reinforced wall plate with the length, width and thickness of 850mm multiplied by 2.5mm to form a metamaterial reinforced wall plate structure, the size of the arranged crystal lattice is 60mm, one axial end face of a vibrator elastic element 1 is connected with a vibrator rigid structure 2, one axial end face of a vibrator elastic element 3 is connected with the vibrator rigid structure 2, a fixed mounting surface of the vibrator unit 5 is a surface perpendicular to the axial direction of the vibrator, the connection mode is cementing, and the reinforced wall plate is made of aluminum materials.
Example two:
parameters of the vibrator unit 5 of the second embodiment are the same as those of the first embodiment, and the fixing and mounting surfaces of the vibrator unit 5 are respectively a vibrator circumferential surface and a surface perpendicular to the axial direction of the vibrator.
Vibration damping effect of the structure in the first preferred embodiment of the present invention referring to fig. 7, it can be seen that the metamaterial plate structure of the vibrator structure of the present invention produces a good vibration damping effect, the average attenuation of the longitudinal wave vibration within 100Hz-1000Hz exceeds 10dB, and the average attenuation of the longitudinal wave vibration within 280Hz-500Hz exceeds 20 dB. From the resonance modes of the vibrator unit 5 in the second preferred embodiment of the present invention, it can be known that: when the surface vertical to the axial direction of the vibrator is adopted as a fixed mounting surface, the vibrator unit 5 has transverse wave coupling resonance at 154Hz, and has two longitudinal wave coupling resonances in the mutually vertical directions at 341 Hz; when the circumferential surface of the vibrator is adopted as a fixed mounting surface, the vibrator has a transverse wave coupling resonance at 341Hz and two longitudinal wave coupling resonances in mutually perpendicular directions at 154Hz, namely, the low-frequency resonance modes in the corresponding mounting state directions can be sequentially coupled with elastic waves in a fixedly mounted surface structure by adjusting the mounting direction of the vibrator, so that the suppression of the elastic waves with different frequencies can be realized by selecting different mounting states.
The above description is only one of the preferred embodiments of the present invention, but the scope of the present invention is not limited thereto. Other embodiments of various modifications and equivalent arrangements, which may occur to those skilled in the art and which are based on or derived from the teachings herein, are also within the scope of the invention.
Claims (9)
1. A local resonance unit of high damping of high rigidity for constructing acoustics metamaterial structure, including oscillator elastic element (1), oscillator rigid element (2), oscillator elastic element (3), support and protective structure (4), oscillator unit (5), its characterized in that: the vibrator elastic element (1) and one end of the vibrator rigid element (2) are tightly and fixedly connected together, the other end of the vibrator rigid element (2) is tightly connected with the vibrator elastic element (3), and the connected vibrator elastic element (1), the vibrator rigid element (2) and the vibrator elastic element (3) are tightly arranged in the supporting and protecting structure (4) together to form a vibrator unit (5) together.
2. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: 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 number of the vibrator elastic elements (3) can be the same or different.
3. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the structural forms of the vibrator elastic element (1), the vibrator rigid element (2) and the vibrator elastic element (3) can be columnar, annular or combined, and the cross section of the vibrator elastic element can be triangular, circular or rectangular; the connection contact position of the vibrator elastic element (1), the vibrator elastic element (3) and the vibrator rigid element (2) can be the end face or the side face of the vibrator elastic element (1) and the vibrator elastic element (3).
4. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the supporting and protecting structure (4) plays a role in supporting and protecting the oscillator unit (5), and can be arranged in a full-closed type or a semi-closed type, the structural form of the supporting and protecting structure is a cylindrical shell, preferably a cylindrical shell or a square prismatic shell, the peripheral shape of the cylindrical shell can be circular, square, rectangular, triangular or polygonal, the shell wall of the supporting and protecting structure (4) can be a solid wall, a perforated wall or a perforated wall, and reinforcing ribs, reinforcing ribs and auxiliary structures combined with the reinforcing ribs and the reinforcing ribs can be arranged on part of the shell wall of the supporting and protecting structure (4).
5. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the vibrator elastic element (1) and the vibrator elastic element (3) can be made of high-damping materials or medium-low damping materials, and preferably rubber, silica gel, metal rubber and springs are selected; the vibrator rigid element (2) can be made of metal materials or non-metal materials, preferably steel, iron, copper, machine glass, magnets and stone materials; the supporting and protective structure (4) can be made of metallic or non-metallic material, preferably steel, aluminium, copper, perspex, PVC, wood, composite, laminate.
6. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the vibrator units (5) are in a single vibrator form, and each vibrator unit (5) has a low-frequency resonance mode corresponding to the vibrator unit along three orthogonal directions and can generate coupling action with longitudinal wave and transverse wave modes propagating in all directions in the base structure; the resonance frequencies of the vibrator unit (5) in different directions are different by designing the vibrator unit (5), so that the elastic waves under different frequencies are effectively inhibited; the vibrator unit (5) has one installation state along three orthogonal directions, the three installation states of the vibrator unit (5) are changed in sequence, the low-frequency resonance mode in the corresponding installation state direction can be coupled with the elastic waves in the base structure in sequence, and therefore the suppression of the elastic waves with different frequencies is achieved by selecting different installation states.
7. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the vibrator units (5) can be in a parallel, serial or series-parallel combined vibrator form, parameters of each vibrator unit forming the combined vibrator can be the same or different, and the low-frequency resonance frequency band of the vibrator units (5) can be remarkably widened only by adjusting various combined installation states of the combined vibrator under the condition of not changing the structural form, material parameters and connection relation among internal elements of the vibrator.
8. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the internal structure of the vibrator unit (5) is isolated and decoupled from the outside through the support and protection structure (4), the intrinsic characteristic of the vibrator unit is not influenced by the outside, and the vibrator unit has a strong protection function.
9. The high stiffness high damping local resonance unit for the construction of an acoustic metamaterial structure as in claim 1, wherein: the vibrator unit (5) can be periodically or non-periodically pasted on the surface of the base structure or embedded in the base structure for use.
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| CN113753173A (en) * | 2021-10-15 | 2021-12-07 | 中国人民解放军国防科技大学 | Sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure and preparation method thereof |
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| CN113763915B (en) * | 2021-10-20 | 2023-06-09 | 西南交通大学 | Complex multimode coupling acoustic metamaterial plate |
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| CN114495884B (en) * | 2022-01-13 | 2023-06-27 | 四川大学 | Lightweight design method for acoustic metamaterial and train low-frequency noise reduction composite floor |
| CN114360479A (en) * | 2022-01-17 | 2022-04-15 | 中国人民解放军国防科技大学 | Channel type metamaterial vibrator unit and mechanical metamaterial composite structure thereof |
| CN114559694A (en) * | 2022-03-02 | 2022-05-31 | 沈阳航空航天大学 | Composite material aircraft wall plate structure and preparation method thereof |
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