Orthogonal array acoustic vibration superstructure based on local resonance lattice

Abstract

The utility model provides an orthogonal array sound vibration superstructure based on a local resonance lattice, which is a multi-cell superstructure formed by mechanically assembling a plurality of cube local resonance lattice unit cell structures along the X direction, the Y direction and the Z direction of a rectangular coordinate system to form orthogonal array arrangement. Each cube local resonance lattice unit cell structure comprises a center solid vibrator and a frustum-shaped elastic element located on the periphery of the center solid vibrator, and mechanical assembly of the cube local resonance lattice unit cell structures in the orthogonal array acoustic vibration superstructure is achieved through elastic couplings and bolts. According to the utility model, the vibration and noise reduction performance of low-frequency broadband and wide-frequency domain is realized; all-metal materials can be adopted to meet the extreme environment service adaptability of wide temperature range, corrosion resistance, radiation resistance and the like; the mechanical assembly connection mode is simple, and the manufacturing cost is low; the multi-directional vibration and noise reduction performance customization flexible design is achieved, and the structure can achieve the multi-functional characteristic.

Description

Technical Field

[0001] The utility model relates to the technical field of vibroacoustic metamaterials, and particularly relates to an orthogonal array vibroacoustic metamaterial based on local resonance lattices. Background Art

[0002] Existing vibroacoustic materials and metamaterials mainly include pure polymers (such as rubber, polyurethane, etc.), particulate filled materials (such as particle damping), cavity resonance type materials (such as grid members), impedance gradient type materials (such as multi-layer composite plates), porous sound-absorbing materials (such as foamed porous materials, aluminum foam). The main problems and defects are as follows: (1) Poor vibration and noise reduction performance under low frequency and different loadings; (2) Poor material reliability in extreme service environments such as space and ocean, and it is difficult to balance environmental adaptability and vibroacoustic performance; (3) The design margin range of vibroacoustic material properties is relatively low, and it is difficult to meet the multi-functional technical requirements such as wide frequency domain, wide temperature range, and multi-directional performance customization.

[0003] Based on this, the utility model proposes an orthogonal array vibroacoustic metamaterial based on local resonance lattices. Summary of the Utility Model

[0004] The purpose of the utility model is to propose an orthogonal array vibroacoustic metamaterial based on local resonance lattices, which has vibration and noise reduction performance in low-frequency broadband and wide frequency domain; can adopt all-metal materials to meet the service adaptability in extreme environments such as wide temperature range, corrosion resistance, and radiation resistance; has a simple mechanical assembly connection method and low manufacturing cost; has flexible design for multi-directional vibration and noise reduction performance customization and the structure can achieve multi-functional characteristics.

[0005] To achieve the above purpose, the utility model proposes an orthogonal array vibroacoustic metamaterial based on local resonance lattices. The orthogonal array vibroacoustic metamaterial is formed by mechanically assembling a plurality of cubic local resonance lattice unit cell structures along the three directions of the rectangular coordinate system XYZ to form a multi-cell metamaterial arranged in an orthogonal array; the cubic local resonance lattice unit cell structure includes a central solid oscillator and a frustum-shaped elastic element located on its outer periphery, and the mechanical assembly of the plurality of cubic local resonance lattice unit cell structures in the orthogonal array vibroacoustic metamaterial is realized through elastic couplings and bolts.

[0006] Preferably, the elastic coupling includes an elastic member in the middle and fastening bolts respectively connected to both ends of the elastic member.

[0007] Preferably, the frustum-shaped elastic element is a frustum-shaped structure composed of a bottom surface and an outwardly expanding side surface enclosing above the bottom surface.

[0008] Preferably, connection holes adapted to the bolts and the fastening bolts on the elastic coupling are provided on the bottom surface of the frustum-shaped elastic element.

[0009] Preferably, the central solid oscillator is in the shape of a cube.

[0010] Preferably, threaded holes adapted to the bolts and the fastening bolts on the elastic coupling are provided on the six side surfaces of the central solid oscillator. Through the arrangement of the threaded holes, the bottom surfaces of the six frustum-shaped elastic elements are respectively fastened and connected to the six side surfaces of the central solid oscillator by bolts or an elastic coupling.

[0011] Preferably, in the orthogonal array acoustic vibration metamaterial structure, the adjacent surfaces of two adjacent cube local resonance lattice unit cell structures are connected by an elastic coupling; in the orthogonal array acoustic vibration metamaterial structure, for the outer side surfaces of the cube local resonance lattice unit cell structures located on the six side surfaces, the frustum-shaped elastic elements and the central solid oscillator are connected by bolts.

[0012] Preferably, the bottom surface of the frustum-shaped elastic element is square and its size is adapted to the size of the side surface of the central solid oscillator.

[0013] Preferably, in the outwardly expanding side surfaces of the frustum-shaped elastic element, the angles between the planes of the four planar regions adjacent to the bottom surface and the bottom surface are all 135°, so as to ensure the mutual matching between the components when the bottom surfaces of the six frustum-shaped elastic elements are mechanically combined with the side surfaces of the central solid oscillator.

[0014] Preferably, the orthogonal array acoustic vibration metamaterial structure is connected to an external machine through a panel. External connection threaded holes and mounting holes for connecting with the orthogonal array acoustic vibration metamaterial structure are reserved on the panel; any of the six side surfaces of the orthogonal array acoustic vibration metamaterial structure can be connected to an external machine through the panel.

[0015] Compared with the prior art, the present utility model has the following beneficial effects:

[0016] 1) It has vibration and noise reduction performance with low frequency broadband and wide frequency domain;

[0017] 2) It can be made of all-metal materials, meeting the service adaptability in extreme environments such as wide temperature range, corrosion resistance, and radiation resistance;

[0018] 3) The connection method is simple mechanical assembly, with low manufacturing cost;

[0019] 4) It has flexible customized design for multi-directional vibration and noise reduction performance, and the structure can achieve multi-functional characteristics. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the orthogonal array acoustic vibration metamaterial structure of the present utility model;

[0021] Figure 2 It is an exploded schematic diagram of the cube local resonance lattice unit cell structure of the present utility model;

[0022] Figure 3 It is the schematic diagram of the local resonance phononic crystal structure;

[0023] Figure 4 It is the schematic diagram of the frustum elastic element structure of the present utility model;

[0024] Figure 5 It is the installation schematic diagram during the use of the orthogonal array acoustic vibration superstructure of the present utility model. Specific embodiments

[0025] The following combines the attached Figures 1-5 to specifically illustrate the technical solution of the present utility model.

[0026] The present utility model proposes an orthogonal array acoustic vibration superstructure based on a local resonance lattice, which is mechanically assembled by the cube local resonance lattice unit cell structure 1 along the three directions of the rectangular coordinate system XYZ respectively to form a multi-cell superstructure arranged in an orthogonal array. Its smallest multi-cell structure is a 3×3×3 combination along the XYZ directions, as Figure 1 shown. The mechanical assembly of multiple cube local resonance lattice unit cells is realized through the elastic coupling 2 and the bolt 3. The elastic coupling 2 includes an elastic member in the middle and fastening bolts respectively connected to both ends of the elastic member. The elastic member can be a spring or other structures.

[0027] As Figure 2 shown, the cube local resonance lattice unit cell structure 1 forms a low-frequency broadband energy absorption structure similar to a phononic crystal by the frustum-shaped elastic elements 101 around it and the high-density (heavy weight) central solid oscillator 102. The energy absorption principle of the phononic crystal structure is as Figure 3 shown. The central high-density mass m and the stiffness k of the surrounding elastic elements together form a local resonance system. When the structural material is subjected to an external dynamic load or acoustic wave radiation, the central solid oscillator 102 absorbs energy through kinetic and potential energy, and the surrounding frustum-shaped elastic elements 101 undergo elastic deformation or internal material micro-motion friction to generate energy absorption and conversion. The cube local resonance lattice unit cell structure 1 of the present utility model is mainly used to solve the problem of low-frequency broadband vibration reduction and noise reduction.

[0028] The shape of the central solid oscillator 102 is a cube, and threaded holes adapted to the bolt 3 and the fastening bolts on the elastic coupling 2 are provided on six side surfaces of the central solid oscillator 102. Through the setting of the threaded holes, the bottom surfaces of the six frustum-shaped elastic elements 101 are respectively fastened and connected to the six side surfaces of the central solid oscillator 102 by the bolt 3 or the elastic coupling 2.

[0029] The structural design of the frustum elastic element is as Figure 4As shown, the frustum-shaped elastic element 101 is a frustum-shaped structure composed of a bottom surface and an outwardly expanding side surface enclosing the bottom surface. The bottom surface of the frustum-shaped elastic element 101 is square and sized to fit the side surface of the central solid oscillator 102. Connection holes adapted to the bolts 3 and the fastening bolts on the elastic coupling 2 are provided on the bottom surface of the frustum-shaped elastic element 101, where the cone angle is 45°, ensuring a perfect match when the six sides of the cube are mechanically combined with each other.

[0030] In the orthogonal array acoustic vibration metamaterial structure, adjacent faces of adjacent cube local resonance lattice unit cell structures 1 are connected by an elastic coupling 2; in the orthogonal array acoustic vibration metamaterial structure, for the outer side surfaces of the cube local resonance lattice unit cell structures 1 located on the six side surfaces, the frustum-shaped elastic element 101 and the central solid oscillator 102 are connected by bolts 3. The elastic coupling 2 can be made of metal materials. By adjusting the stiffness of the frustum-shaped elastic element 101 and the stiffness of the elastic coupling 2, the requirements for vibration and noise reduction under different loadings (wide frequency range) can be achieved.

[0031] For the components of the orthogonal array acoustic vibration metamaterial structure based on local resonance lattices, high-reliability materials with extreme environment adaptability are selected. For example, the frustum-shaped elastic element 101 can be made of metal rubber wound from stainless steel wire, or elastic porous materials pressed or sintered from metal fibers; the central solid oscillator 102 can be made of high-density tungsten alloy, lead metal, etc.; the fastening bolts 3 are made of metal materials such as stainless steel and carbon steel. The selection of all materials has a high degree of flexibility, which can meet the reliability requirements under extreme service environments (wide temperature range) such as space and ocean, and also take into account the acoustic vibration performance.

[0032] The orthogonal array acoustic vibration metamaterial structure can be mechanically connected in series and parallel in the XYZ three directions by different numbers of local resonance lattices 1, or the stiffness in a specific direction of the elastic coupling 2 can be adjusted to achieve different customized requirements for vibration and noise reduction performance in the three directions. For example, to achieve the requirements for vibration and noise reduction with equal stiffness in three directions, an orthogonal array arrangement of the same lattices in three directions can be adopted. This solves the technical problem of customizing multi-directional vibration and noise reduction performance in the prior art.

[0033] The utility model can be used for low-frequency noise reduction, high load-bearing, and ocean environment resistance of key components of deep-sea equipment; for resistance to space radiation environment and vibration damping and buffering during launch of key components of space equipment; for mechanical transportation equipment, such as acoustic packages for vehicle batteries, vibration damping, buffering, and energy absorption devices for vehicle bumpers, and multi-directional vibration damping and buffering for electrical control cabinets.

[0034] The utility model can select different local resonance lattice combination schemes of the orthogonal array acoustic vibration metamaterial structure according to the structural size requirements and vibration damping performance requirements in the load direction during the use of the product, and select appropriate elastic components to match the vibration damping performance and environmental adaptability requirements.

[0035] In the X, Y, and Z directions, it can be connected through an external mechanical connection interface, such as Figure 5 As shown, external connection threaded holes 401 and mounting holes 402 for connecting with the acoustic vibration superstructure of the present invention are reserved on the panel 4. The connection between the panel 4 and the acoustic vibration superstructure is achieved by passing bolts through the mounting holes 402 of the panel 4 and the frustum-shaped elastic element 101 in sequence and then locking them to the central solid oscillator 102.

[0036] The above is the preferred embodiment of the present invention. Any changes made according to the technical solution of the present invention, as long as the functions and effects generated do not exceed the scope of the technical solution of the present invention, shall fall within the protection scope of the present invention.

Claims

1. An orthogonal array acoustic superstructure based on a local resonance lattice, characterized in that: The orthogonal array acoustic vibration superstructure is composed of a plurality of cube local resonance lattice unit cell structures (1) mechanically assembled along three directions of a rectangular coordinate system XYZ to form a multi-cell superstructure arranged in an orthogonal array; the cube local resonance lattice unit cell structure (1) comprises a central solid oscillator (102) and a frustum-shaped elastic element (101) located on its periphery; the mechanical assembly of the plurality of cube local resonance lattice unit cell structures (1) in the orthogonal array acoustic vibration superstructure is achieved by means of an elastic coupling (2) and bolts (3).

2. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 1, characterized in that: The elastic coupling (2) comprises an elastic member located in the middle and fastening bolts respectively connected to both ends of the elastic member.

3. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 2, characterized in that: The frustum-shaped elastic element (101) is a frustum-shaped structure consisting of a bottom surface and an outwardly expanded side surface enclosed above the bottom surface.

4. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 3, characterized in that: A connection hole adapted to fit the bolt (3) and the fastening bolt on the elastic coupling (2) is provided on the bottom surface of the frustum-shaped elastic element (101).

5. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 4, characterized in that: The central solid vibrator (102) is in the shape of a cube.

6. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 5, characterized in that: The six side surfaces of the central solid vibrator (102) are each provided with threaded holes that are compatible with the bolts (3) and the fastening bolts on the elastic coupling (2); the bottom surfaces of the six frustum-shaped elastic elements (101) are respectively fastened and connected to the six side surfaces of the central solid vibrator (102) by means of the threaded holes and the bolts (3) or the elastic coupling (2).

7. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 6, characterized in that: In the orthogonal array acoustic vibration superstructure, adjacent faces of two adjacent cube local resonance lattice unit cell structures (1) are connected via an elastic coupling (2); in the orthogonal array acoustic vibration superstructure, the outer side faces of the cube local resonance lattice unit cell structures (1) located on six side faces, their frustum-shaped elastic elements (101) and the central solid vibrator (102) are connected via bolts (3).

8. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 6, characterized in that: The bottom surface of the frustum-shaped elastic element (101) is square and its size is adapted to the size of the side surface of the central solid vibrator (102).

9. The orthogonal array vibroacoustic superstructure based on a local resonance lattice according to claim 6, characterized in that: In the outwardly expanded side surface of the frustum-shaped elastic element (101), the included angles between the planes of the four planar regions connected to the bottom surface and the bottom surface are all 135°, so as to ensure that the bottom surfaces of the six frustum-shaped elastic elements (101) and the side surfaces of the central solid vibrator (102) are matched with each other when the bottom surfaces are mechanically combined.

10. An orthogonal array vibroacoustic superstructure based on a local resonance lattice according to any one of claims 1 to 9, characterized in that: The orthogonal array acoustic vibration superstructure is connected to an external machine via a panel (4); the panel (4) is provided with external connection threaded holes (401) and mounting holes (402) interconnected with the orthogonal array acoustic vibration superstructure; all six sides of the orthogonal array acoustic vibration superstructure can be connected to an external machine via the panel (4).

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