CN221641970U - High-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure and composite superstructure - Google Patents

Abstract

The utility model discloses a high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure and a composite metamaterial structure, wherein the integrated metamaterial structure comprises a high-load-bearing structure part with high rigidity and high porosity and a flexible thin-layer sound-insulation part; the high bearing structure part comprises a high-porosity plate shell structure layer and a supporting mass layer, and the supporting mass layer comprises a plurality of supporting mass bodies which are discretely distributed on one side of the high-porosity plate shell structure layer; the flexible thin-layer sound insulation part is positioned between the two high bearing structure parts, and two sides of the flexible thin-layer sound insulation part are respectively connected with the supporting mass layer. The utility model is applied to the field of noise treatment, and the high-bearing structure part consisting of the high-porosity plate-shell structural layer and the discretely distributed supporting mass bodies is introduced on the basis of the traditional plate-type acoustic metamaterial, so that the metamaterial structure integrating the high-bearing and low-frequency high-sound-insulation functions has good low-frequency and high-efficiency sound-insulation performance, high-rigidity bearing capacity and wide engineering application prospect.

Description

Metamaterial structure and composite superstructure integrating high load-bearing capacity and low-frequency high sound insulation function

Technical Field

The utility model relates to new materials and new technologies for noise control, specifically a metamaterial structure and a composite metastructure integrating high load-bearing capacity and low-frequency high sound insulation functions, which can be applied to acoustic control of modern transportation vehicles (rail vehicles, aircraft, spacecraft, ships, automobiles, engineering material transport vehicles), new functional venues/rooms (waiting halls, recording/studios, conference venues, multi-functional classrooms, anechoic rooms), smart furniture (air conditioners, refrigerators, washing machines, fresh air systems) and substations, road sound barriers, pipeline systems, etc.

Background Art

Multifunctional composite load-bearing structures with advantages such as light weight and high stiffness are widely used in aircraft, ships, high-speed rail and other fields. At present, new equipment is developing in the direction of high power, high speed, light weight and intelligence, and people have higher requirements for the sound insulation and noise reduction of equipment and structural stiffness. For the control of high-frequency noise, due to its short wavelength and weak transmission ability, a better noise reduction effect can be achieved by using ordinary thin sound-absorbing and insulating materials. As for the control of low-frequency noise (100-1000Hz), it is limited by the law of mass, so that traditional structures can only achieve low-frequency and high sound insulation by increasing the structural mass. However, the increase in mass runs counter to the development concept of modern equipment and cannot meet the needs of actual engineering applications. How to achieve low-frequency and high sound insulation while ensuring lightweight and taking into account greater stiffness is a major challenge facing the engineering community.

In recent years, the metamaterial technology proposed and developed in the fields of acoustic physics and condensed matter physics can break the limitations of the mass law and provide new ideas and methods for sound insulation and noise reduction control. Metamaterial/structure refers to a new type of composite structure composed of specially designed artificial oscillator units (such as local resonance units, referred to as oscillators) attached to the base structure in a certain way (such as attached to the base plate and shell structure to form a metamaterial plate and shell structure). The extraordinary physical properties of acoustic metamaterials/structures (such as negative equivalent mass density, negative equivalent modulus, etc.) can achieve extraordinary control of low-frequency elastic waves and sound waves, making them have broad application value in the field of low-frequency vibration reduction and noise reduction. Acoustic metamaterials can be roughly divided into the following three types: membrane type, plate type and Helmholtz resonance type. The commonality of the three is that their control of sound waves is based on artificially designed structures rather than the characteristics of the material itself. Therefore, different configuration structures can be designed to meet different sound wave control needs. Nowadays, some acoustic metamaterials with simple structures have appeared and have been proven to have low-frequency sound insulation performance that is higher than the mass law. However, their stiffness is mostly low and they are difficult to fix, and they do not have load-bearing capacity, which limits their practical engineering applications.

Utility Model Content

In view of the deficiencies in the above-mentioned prior art, the utility model provides a metamaterial structure and a composite metastructure integrating high load-bearing and low-frequency high sound insulation functions, which can effectively combine high stiffness and low-frequency sound insulation performance and have broad engineering application prospects.

To achieve the above-mentioned purpose, the utility model provides a metamaterial structure with high load-bearing and low-frequency high sound insulation functions, comprising two layers of high-load-bearing structural parts with high rigidity and high porosity and a layer of flexible thin-layer sound insulation part;

The high-bearing structure portion includes a high-porosity plate-shell structure layer and a support mass layer, wherein the support mass layer includes a plurality of support mass bodies discretely distributed on one side of the high-porosity plate-shell structure layer;

The flexible thin layer sound insulation part is located between the two high load-bearing structural parts, and two surfaces of the flexible thin layer sound insulation part are respectively connected to the supporting mass layer.

In one of the embodiments, the high porosity plate-shell structure layer is a high sound-transmitting plate-shell structure with a porosity greater than or equal to 30%.

In one embodiment, the flexible thin layer sound insulation part is a thin plate with a thickness less than or equal to 1 mm, and the bending stiffness of the flexible thin layer sound insulation part is less than the bending stiffness of an aluminum plate with a thickness of 0.5 mm.

In one embodiment, the cavity between the high-load bearing structure and the flexible thin-layer sound insulation portion is filled with a porous sound absorbing medium.

In one embodiment, the geometric shape of the holes on the high-porosity plate-shell structure layer is circular, elliptical, rectangular, trapezoidal, rhombus, triangular or axisymmetric regular polygonal;

The material of the high-porosity plate-shell structure layer is one of metal material, plastic material, rubber material, resin material and composite material.

In one embodiment, the supporting mass body is a strip or a block;

The cross-sectional shape of the supporting mass body is a rectangle, a cone, a trapezoid, a rhombus, a triangle or an axisymmetric regular polygon.

To achieve the above object, the utility model also provides a composite superstructure with integrated high load-bearing and low-frequency high sound insulation functions, comprising two or more of the above-mentioned integrated metamaterial structures with integrated high load-bearing and low-frequency high sound insulation functions;

Each of the high-load-bearing and low-frequency and high-sound-insulating integrated metamaterial structures is stacked in sequence, and two adjacent high-load-bearing and low-frequency and high-sound-insulating integrated metamaterial structures are directly connected or connected through a connecting structure.

To achieve the above object, the utility model also provides a high-load bearing and low-frequency high sound insulation function integrated composite superstructure, comprising an acoustic decoupling part, a plate shell structure part and the above-mentioned high-load bearing and low-frequency high sound insulation function integrated metamaterial structure;

The acoustic decoupling part is located between the high-load-bearing and low-frequency high-sound-insulation integrated metamaterial structure and the plate-shell structure part; or

The acoustic decoupling part is located on one side of the metamaterial structure integrating high load-bearing and low-frequency high sound insulation functions; or

The acoustic decoupling portion is located at one side of the plate shell structure portion.

In one embodiment, the acoustic decoupling portion is a high-porosity acoustic medium with a porosity greater than 70%.

In one embodiment, the plate and shell structure is one of a meta-material structure integrating high load-bearing and low-frequency high sound insulation functions, a homogeneous material plate and shell, a composite material plate and shell, a honeycomb sandwich plate and shell, a corrugated sandwich plate and shell, a lightweight foam sandwich plate and shell, or a lattice structure sandwich plate and shell.

Compared with the prior art, the utility model has the following beneficial technical effects:

In the utility model, a high-load-bearing structure consisting of a high-porosity plate-shell structure layer and a discretely distributed supporting mass body is introduced on the basis of a traditional plate-type acoustic metamaterial, so that the metamaterial structure integrating high load-bearing and low-frequency high sound insulation functions is not only simple and reasonable in structure, but also can effectively have both high stiffness and low-frequency sound insulation performance.

Specifically, the utility model is based on the traditional plate-type acoustic metamaterial, and is composed of a high-load-bearing structure composed of a high-porosity plate-shell structure layer and a group of discretely distributed supporting mass bodies, so as to improve its stiffness and load-bearing capacity, while ensuring that the low-frequency sound insulation of the plate-type acoustic metamaterial will not be affected. Among them, the porosity of the high-porosity plate-shell structure layer has an impact on the sound insulation performance of the high-load-bearing structure and the high-load-bearing and low-frequency high-sound insulation integrated metamaterial structure. Specifically, within a certain range, the sound insulation bandwidth of the high-load-bearing and low-frequency high-sound insulation integrated metamaterial structure increases with the increase of porosity. When the porosity is not less than 30%, the change of porosity has little effect on the sound insulation performance of the high-load-bearing and low-frequency high-sound insulation integrated metamaterial. Under the condition of acoustic wave excitation, the high-load-bearing and low-frequency high-sound insulation integrated metamaterial will produce a certain number of sound insulation peaks and sound insulation valleys within the design frequency range. The generation of sound insulation peaks and sound insulation valleys is related to the dynamic equivalent surface density of the high-load-bearing and low-frequency high-sound insulation integrated metamaterial. Specifically, at the sound insulation peak frequency, the integrated metamaterial with high load-bearing capacity and low-frequency high sound insulation functions has the maximum dynamic equivalent surface density.

In summary, the utility model has both good low-frequency and high-efficiency sound insulation performance and high-rigidity bearing capacity. It is a multifunctional composite superstructure with broad engineering application prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

FIG1 is a schematic diagram of the structure of an integrated metamaterial structure in Example 1 of the present utility model;

FIG2 is a first isometric view of the high-load bearing structure in Embodiment 1 of the present invention;

FIG3 is a second isometric view of the high-load bearing structure in Embodiment 1 of the present invention;

FIG4 is a schematic diagram of a cavity medium in Example 1 of the utility model, which is a porous sound-absorbing foam medium;

FIG5 is a schematic structural diagram of an integrated metamaterial structure when the geometric shape of the holes on the high-porosity plate-shell structure layer in Example 1 of the present utility model is a diamond shape;

FIG6 is a schematic structural diagram of an integrated metamaterial structure when the geometric shape of the holes on the high-porosity plate-shell structure layer in Example 1 of the present utility model is a polygon;

FIG7 is a schematic structural diagram of an integrated metamaterial structure when the geometric shape of the holes on the high-porosity plate-shell structure layer in Example 1 of the present utility model is a triangle;

8 is a schematic structural diagram of an integrated metamaterial structure when the cross-sectional shape of the supporting mass body in Example 1 of the present utility model is a trapezoid;

9 is a schematic structural diagram of an integrated metamaterial structure when the cross-sectional shape of the supporting mass body in Example 1 of the present utility model is an axisymmetric regular polygon;

FIG10 is a schematic structural diagram of an integrated metamaterial structure when the cross-sectional shape of the supporting mass body in Example 1 of the present utility model is an I-shape;

FIG11 is a schematic structural diagram of an integrated metamaterial structure when supporting masses are arranged two-dimensionally and periodically in Example 1 of the present utility model;

FIG12 is a schematic diagram of the structure of the integrated superstructure unit in Example 1 of the present utility model;

FIG13 is a schematic diagram showing the effect of the porosity change of the high-porosity plate-shell structure layer on the sound insulation performance of the integrated metamaterial structure in Example 1 of the present utility model;

FIG14 is a schematic structural diagram of an integrated metamaterial structure having a layer of high-load bearing structure in Example 1 of the present utility model;

FIG15 is a schematic diagram of a first implementation of an integrated composite superstructure in Example 2 of the present utility model;

FIG16 is a schematic diagram of a second implementation of the integrated composite superstructure in Example 2 of the present utility model;

FIG17 is a schematic diagram of the sound insulation performance of the integrated composite superstructure in Example 2 of the present utility model;

FIG. 18 is a schematic diagram of a third implementation of the integrated composite superstructure in Example 3 of the present utility model.

Figure numbers: 1. High-porosity plate-shell structure layer; 2. Support mass body; 3. Flexible thin-layer sound insulation part; 4. Cavity; A1. High-load-bearing structure part; A2. Integrated metamaterial structure; A3. Acoustic decoupling part; A4. Plate-shell structure part.

The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Example 1

As shown in FIGS. 1 to 3, a metamaterial structure with high load-bearing capacity and low-frequency high sound insulation function integrated (hereinafter referred to as "integrated metamaterial structure") disclosed in this embodiment mainly includes two layers of high-rigidity and high-porosity high-load-bearing structural parts A1 and a layer of flexible thin-layer sound insulation part 3. The high-load-bearing structural part A1 includes a layer of high-porosity plate-shell structural layer 1 and a layer of supporting mass layer, the supporting mass layer includes a plurality of supporting mass bodies 2 discretely distributed on one side of the high-porosity plate-shell structural layer 1, the flexible thin-layer sound insulation part 3 is located between the two high-load-bearing structural parts A1, and the two sides of the flexible thin-layer sound insulation part 3 are respectively connected to the supporting mass layer.

In the specific implementation process, the cavity 4 formed between the high-porosity plate shell structure layer 1 and the flexible thin-layer sound insulation part 3 may not be filled with other substances, that is, air is used as the acoustic medium, as shown in Figure 1. Preferably, the cavity 4 between the high-bearing structure part A1 and the flexible thin-layer sound insulation part 3 may also be filled with a porous sound-absorbing medium, such as a porous foam material, a porous fiber material, or a combination of different high-porosity acoustic media, as shown in Figure 4.

In the specific implementation process, the material of the high-porosity plate-shell structure layer 1 is one of metal materials, plastic materials, rubber materials, resin materials, and composite materials. The geometric shape of the holes on the high-porosity plate-shell structure layer 1 is circular, elliptical, rectangular, trapezoidal, rhombus, triangular, or axially symmetrical regular polygons. For example, FIG. 1, FIG. 5, FIG. 6, and FIG. 7 show high-porosity plate-shell structure layers 1 with circular holes, rhombus holes, polygonal holes, and triangular holes, respectively.

In the specific implementation process, the material of the supporting mass body 2 can also be one of metal materials, plastic materials, rubber materials, resin materials, and composite materials. The cross-sectional shape of the supporting mass body 2 is rectangular, conical, trapezoidal, rhombus, triangle, or axisymmetric regular polygon. For example, FIG. 1, FIG. 8, FIG. 9, and FIG. 10 respectively show supporting mass bodies 2 with rectangular, trapezoidal, axisymmetric regular polygonal, and I-shaped cross sections.

In the specific implementation process, the arrangement of the supporting mass bodies 2 on the high-porosity plate-shell structure layer 1 is one-dimensional periodic or non-periodic arrangement and two-dimensional periodic or non-periodic arrangement. For example, Figures 1 and 11 are one-dimensional and two-dimensional array arrangements respectively.

In a specific implementation process, the flexible thin layer sound insulation part 3 is a thin plate with a thickness less than or equal to 1 mm, and the bending stiffness of the flexible thin layer sound insulation part 3 is less than the bending stiffness of an aluminum plate with a thickness of 0.5 mm. The material of the flexible thin layer sound insulation part 3 can also be one of metal materials, plastic materials, rubber materials, resin materials, and composite materials.

The high-porosity plate-shell structure layer 1 and the supporting mass body 2 together constitute a high-rigidity, high-porosity, high-bearing structure portion A1. On the one hand, the high-bearing structure portion A1 serves as an additional mass of the flexible thin-layer sound insulation portion 3 to adjust the sound insulation peak frequency of the integrated metamaterial structure. On the other hand, the high-bearing structure portion A1 can provide rigidity for the integrated metamaterial structure without affecting the smooth transmission of sound waves, and can prevent the flexible thin-layer sound insulation portion 3 from being damaged to a certain extent.

As a preferred embodiment, the high-load-bearing structure part A1 composed of the high-porosity plate-shell structure layer 1 and the supporting mass body 2 can be integrally formed by casting, 3D printing or additive manufacturing, thereby ensuring the integrity of the product and enabling the superstructure to have better load-bearing capacity.

In a specific implementation process, the high-load bearing structure part A1 is connected to the flexible thin-layer sound insulation part 3 by gluing, that is, the supporting mass body 2 is connected to the flexible thin-layer sound insulation part 3 by gluing.

It is worth noting that in the specific application process, the high-porosity plate shell structure layer 1, the supporting mass body 2 and the flexible thin-layer sound insulation part 3 can be separately manufactured and then connected to form a whole by riveting, welding, threaded connection, locking connection or bonding.

In this embodiment, the integrated metamaterial structure is formed by a periodic array of multiple integrated superstructure units shown in FIG12. Referring to FIG12, the length of the integrated superstructure unit along the x direction is 21 mm, and the length along the y direction is 7 mm. The porosity of the high-porosity plate-shell structure layer 1 in FIG1 is 30%, and the length of the integrated superstructure along the x direction is 657 mm, and the length along the y direction is 657 mm.

Under the condition that other conditions remain unchanged, the change of the porosity of the high-porosity plate-shell structure layer 1 has an impact on the sound insulation performance of the integrated metamaterial structure. Referring to FIG13, it is a schematic diagram of the impact of the porosity change of the high-porosity plate-shell structure layer 1 on the sound insulation performance of the integrated metamaterial structure. As shown in FIG13, the integrated metamaterial structure breaks the limitation of the mass law within a certain frequency range (200Hz-700Hz), achieves a higher sound insulation, and when the porosity is less than 30%, the sound insulation bandwidth increases with the increase of the porosity. It can be seen that the metamaterial structure in this embodiment realizes a low-frequency sound insulation multifunctional integrated design under the condition of ensuring its bearing stiffness, and has both low-frequency sound insulation and high stiffness bearing performance; in addition, the processing and manufacturing cost is low, the installation is convenient, and the reliability is high, which overcomes the shortcomings of the traditional metamaterial structure design scheme, such as isolated and single functions, long development time, extra space occupation, complex processing and installation, high cost, and poor reliability.

It is worth noting that in a specific application process, the integrated metamaterial structure may also have only one layer of high-rigidity, high-porosity, high-load-bearing structural portion A1, as shown in FIG. 14 .

Example 2

This embodiment discloses an integrated composite superstructure with high load-bearing capacity and low-frequency high sound insulation function (hereinafter referred to as "integrated composite superstructure"), which mainly includes an acoustic decoupling part A3, a plate-shell structure part A4 and the integrated metamaterial structure A2 in Example 1. Among them, the acoustic decoupling part A3 is a high-porosity acoustic medium with a porosity greater than 70%, and the acoustic decoupling part A3 is located between the integrated metamaterial structure A2 and the plate-shell structure part A4, as shown in Figure 15. In the specific application process, the integrated metamaterial structure A2 can be set between the acoustic decoupling part A3 and the plate-shell structure part A4, or the plate-shell structure part A4 can be set between the acoustic decoupling part A3 and the integrated metamaterial structure A2.

In this embodiment, the acoustic decoupling part A3 is a high-porosity acoustic medium, such as a porous foam medium, a fiber-type porous acoustic medium, or a combination of different high-porosity acoustic media. The plate shell structure part A4 is one or a combination of two or more of the integrated metamaterial structure A2, a homogeneous material plate shell, a composite material plate shell, a honeycomb sandwich plate shell, a corrugated sandwich plate shell, a lightweight foam sandwich plate shell, or a lattice structure sandwich plate shell, as shown in FIG16. The material of the plate shell structure part A4 can be a metal material, a plastic material, a rubber material, a resin material, a composite material, or a combination thereof.

Refer to Figure 17, which is a schematic diagram of the sound insulation performance of the integrated composite superstructure in this embodiment. As shown in Figure 17, the number of low-frequency sound insulation peaks of the integrated composite superstructure is greater than that of the single-layer integrated superstructure shown in Figure 13, and the sound insulation bandwidth is wider. The mutual coupling between multiple sound insulation peaks can achieve the effect of broadening the sound insulation bandwidth and improving the sound insulation performance.

Example 3

This embodiment discloses an integrated composite superstructure with high load-bearing capacity and low-frequency high sound insulation function (hereinafter referred to as "integrated composite superstructure"), which mainly includes two or more integrated metamaterial structures A2 in Embodiment 1. Among them, each integrated metamaterial structure A2 is stacked in sequence vertically, and two adjacent integrated metamaterial structures A2 are directly connected or connected through a connection structure formed by a supporting mass layer and a flexible thin layer sound insulation part. Among them, the integrated composite superstructure can also include a plate-shell structure part A4, and the plate-shell structure part A4 is stacked with the integrated metamaterial structure A2, as shown in FIG18.

The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly/indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims (10)

1. The high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure is characterized by comprising two layers of high-load-bearing structural parts with high rigidity and high porosity and a layer of flexible thin-layer sound-insulation part;

The high-bearing structure part comprises a high-porosity plate shell structure layer and a supporting mass layer, and the supporting mass layer comprises a plurality of supporting mass bodies which are discretely distributed on one side of the high-porosity plate shell structure layer;

The flexible thin-layer sound insulation part is positioned between the two high-bearing structural parts, and two sides of the flexible thin-layer sound insulation part are respectively connected with the supporting quality layer.

2. The high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure according to claim 1, wherein the high-porosity plate shell structure layer is a high-sound-transmission plate shell structure with a porosity of more than or equal to 30%.

3. The high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure according to claim 1, wherein the flexible thin-layer sound-insulation part is a thin plate with the thickness smaller than or equal to 1mm, and the bending rigidity of the flexible thin-layer sound-insulation part is smaller than the bending rigidity of an aluminum plate with the thickness smaller than 0.5 mm.

4. The high-load and low-frequency high-sound insulation function integrated metamaterial structure according to claim 1, wherein a cavity between the high-load structure part and the flexible thin-layer sound insulation part is filled with a porous sound absorption medium.

5. The metamaterial structure integrating high bearing and low frequency high sound insulation functions according to claim 1, wherein the geometry of the holes in the high-porosity plate shell structure layer is circular, elliptical, rectangular, trapezoidal, rhombic, triangular or axisymmetric regular polygon;

the high-porosity plate shell structure layer is made of one of a metal material, a plastic material, a rubber material, a resin material and a composite material.

6. The metamaterial structure integrating high bearing and low frequency high sound insulation functions according to claim 1, wherein the supporting mass body is a strip-shaped body or a block-shaped body;

The cross section of the supporting mass body is rectangular, conical, trapezoidal, rhombic, triangular or axisymmetric regular polygonal.

7. The high-load and low-frequency high-sound-insulation function integrated composite super structure is characterized by comprising more than two high-load and low-frequency high-sound-insulation function integrated metamaterial structures according to any one of claims 1 to 6;

Each high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structure is sequentially stacked, and two adjacent high-load-bearing and low-frequency high-sound-insulation function integrated metamaterial structures are directly connected or connected through a connecting structure.

8. The high-load and low-frequency high-sound-insulation function integrated composite super structure is characterized by comprising an acoustic decoupling part, a plate shell structure part and the high-load and low-frequency high-sound-insulation function integrated metamaterial structure as set forth in any one of claims 1 to 6;

The acoustic decoupling part is positioned between the high-load and low-frequency high-sound-insulation function integrated metamaterial structure and the plate shell structure part; or (b)

The acoustic decoupling part is positioned at one side of the metamaterial structure integrating high bearing and low frequency high sound insulation functions; or (b)

The acoustic decoupling portion is located on one side of the panel housing structure portion.

9. The high-load and low-frequency high-sound insulation function integrated composite superstructure according to claim 8, wherein the acoustic decoupler is a high-porosity acoustic medium with a porosity greater than 70%.

10. The high-load and low-frequency high-sound-insulation function integrated composite super structure according to claim 8, wherein the plate shell structure part is one of a high-load and low-frequency high-sound-insulation function integrated super material structure, a homogeneous material plate shell, a composite material plate shell, a honeycomb sandwich plate shell, a corrugated sandwich plate shell, a light foam sandwich plate shell or a lattice structure sandwich plate shell.