Low-frequency broadband noise reduction acoustic structure and design method of acoustic structure

Abstract

The invention belongs to the technical field of acoustics, and discloses a low-frequency and broadband noise reduction acoustic structure and a design method of the acoustics structure.The acoustics structure comprises a plurality of acoustics structural parts and embedded parts, at least one embedded part is arranged in the multiple acoustics structural parts in a penetrating mode, and the multiple embedded parts are arranged on the same embedded part. The acoustic structural parts communicated with the openings in the two ends of the embedded part are arranged in pairs and form a first element together with the embedded part, the acoustic structural part not communicated with the embedded part is a second element, and the first element and the second element are arranged in parallel. Compared with the prior art, when sound waves pass through the acoustic structural members which are arranged in pairs, coupling resonance generated in the acoustic structural members can widen the silencing frequency band at a certain resonant frequency in a low-frequency range, the additionally arranged embedded members can enable the acoustic structural members to generate a new silencing frequency band, and the weak coupling effect existing between the parallel elements can continue to widen the silencing frequency band. Finally, the low-frequency and wider-band noise elimination and reduction effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, and in particular to an acoustic structure for low-frequency and broadband noise reduction and a design method of the acoustic structure. Background Art

[0002] Aircraft engine noise control is crucial to meeting noise airworthiness standards and improving cabin comfort. For the noise generated by the engine, in addition to active noise control and geometric optimization noise reduction, damping materials can be laid in the air inlet, reverse thrust device and tail nozzle system for passive noise reduction. The damping materials initially used were mainly porous sound-absorbing materials, which were later improved to lay single-degree-of-freedom acoustic structures. With the development of science and technology, various aircraft manufacturers and engine suppliers have successively carried out a lot of noise reduction structure research, and thus proposed a mesh cap acoustic structure, which aims to improve the noise reduction ability of different noise frequency bands.

[0003] However, the mesh cap structure in this type of acoustic structure not only has a high gluing difficulty coefficient during industrial production, and repeated trial and error leads to long product development cycles and high costs, but also is easily damaged and falls off under the influence of the rotating vibration of the engine blades, making it difficult to control the effective acoustic performance. With the use of high bypass ratio engines and the introduction of more stringent noise airworthiness standards, this structure will no longer be able to further meet the actual needs of aircraft in terms of comfort and quietness.

[0004] In order to overcome the above-mentioned long-standing problems, designing acoustic structures with wide sound absorption bandwidth, multiple resonance sound absorption peaks, and strong overall mechanical properties has become the main development trend of new anechoic nacelle sound linings. Summary of the invention

[0005] The purpose of the present invention is to provide an acoustic structure with low-frequency and broadband noise reduction and a design method of the acoustic structure, aiming to enhance the low-frequency noise reduction capability while broadening the low-frequency silencing band and maintaining high mechanical properties.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] On the one hand, a low-frequency, broadband noise reduction acoustic structure is provided, the low-frequency, broadband noise reduction acoustic structure comprising a plurality of acoustic structural members and embedded members, a plurality of the acoustic structural members are each provided with a resonance chamber, and are provided with at least one microhole connected to the resonance chamber, the embedded member is a hollow structure with both ends open, at least one of the plurality of the acoustic structural members is penetrated by the embedded member, on the same embedded member, the acoustic structural members connected to the open ends of the embedded member are arranged in pairs, and together with the embedded member constitute a first element, at least one acoustic structural member not connected to the embedded member is provided between the two acoustic structural members connected to the embedded member, the acoustic structural member not connected to the embedded member is a second element, and the first element and the second element are arranged in parallel.

[0008] Optionally, the acoustic structural component includes a through-hole panel and a structural component body, the structural component body is a hollow shell with a single-side opening, the structural component body is provided with at least one connecting notch matching the shape of the embedded component, the through-hole panel covers the opening of the structural component body to form the resonance chamber, and the micropores are provided on the through-hole panel.

[0009] Optionally, the through-hole panels of the two acoustic structural members connected to both ends of the embedded member have the same porosity.

[0010] Optionally, the porosity of the through-hole panels of the acoustic structural member in communication with the inner insert and the porosity of the through-hole panels of the acoustic structural member not in communication with the inner insert are different.

[0011] Optionally, an end portion of the inner embedment extends in the resonance chamber of the acoustic structure connected to the inner embedment, but does not abut against an inner wall of the resonance chamber.

[0012] Optionally, when a plurality of the embedded components are inserted into a plurality of the acoustic structural components, the plurality of embedded components have the same or different cross-sectional shapes.

[0013] Optionally, the cross-sectional shape of the micropore is circular, elliptical, or polygonal;

[0014] The cross-sectional shape of the resonance chamber is polygonal or circular;

[0015] The longitudinal section of the embedded component is polygonal, semicircular, or semi-elliptical.

[0016] On the other hand, a method for designing an acoustic structure is also provided. The method for designing an acoustic structure for designing a low-frequency, broadband noise reduction acoustic structure as described in any one of the above items comprises the following steps:

[0017] S1: obtaining the structural dimensions of the plurality of acoustic structural components and the number and diameter of the microholes opened on the plurality of acoustic structural components, and generating a structural model of the combination of the plurality of acoustic structural components;

[0018] S2: constructing a sound absorption function of a required sound frequency band according to the structural model;

[0019] S3: Based on the sound absorption function, a required sound absorption spectrum is formulated according to design requirements, and the size parameters of the embedded component that meet the sound absorption requirements are found using an optimization algorithm, and the embedded component is combined with the acoustic structural component in the structural model to generate an overall model of the low-frequency, broadband noise reduction acoustic structure;

[0020] S4: Further adjust the size parameters of the overall model, the number and position of the embedded parts, so that the low-frequency, broadband noise reduction acoustic structure meets the design requirements.

[0021] Optionally, in step S3, the optimization algorithm is a reinforcement learning algorithm or a genetic algorithm.

[0022] Optionally, in step S4, the dimensional parameters that can be used for adjustment in the overall model include structural dimensions of a plurality of the acoustic structural components, the number, diameter and arrangement of the microholes opened on the acoustic structural components, and dimensional parameters of the embedded components.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides an acoustic structure for low-frequency and broadband noise reduction. When sound waves enter the acoustic structural parts with resonance chambers arranged in pairs and connected by embedded parts, the coupling resonance effect generated inside can widen the sound-absorbing band at a certain resonance frequency in the low-frequency range, and the additional embedded parts can also make the paired acoustic structural parts produce new sound-absorbing bands, and further widen the low-frequency sound-absorbing band by combining with their own sound-absorbing bands. In addition, at least one acoustic structural part that is not connected to the embedded part is provided between the acoustic structural parts connected by the two ends of the embedded part, so that the acoustic structural part connected by the embedded part and the acoustic structural part not connected by the embedded part form two parallel primitives, and the sound waves produce a weak coupling resonance effect between the two parallel primitives, which can achieve low-frequency and wider-band sound absorption and noise reduction. Compared with the acoustic structure of the existing reticular structure, the acoustic structure has stronger mechanical properties and can improve the problem of easy damage and detachment of the structure under long-term vibration environment.

[0025] The present invention also provides a method for designing an acoustic structure, which is used to design the above-mentioned low-frequency, broadband noise reduction acoustic structure so that its various parameters are accurate and reasonable, thereby ensuring that the low-frequency, broadband noise reduction acoustic structure meets the design requirements, so as to obtain a wider low-frequency sound absorption band and better sound absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of an acoustic structure for low-frequency and broadband noise reduction in Embodiment 1 of the present invention;

[0027] Figure 2 is a top view of the acoustic structure for low-frequency and broadband noise reduction in the first embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a first primitive of an acoustic structure for low-frequency and broadband noise reduction in Embodiment 1 of the present invention;

[0029] Figure 4 is a top view of the acoustic structural component in the first primitive of the first embodiment of the present invention;

[0030] Figure 5 yes Figure 4 Cross-sectional view along AA direction;

[0031] Figure 6 is a schematic structural diagram of a second primitive of the acoustic structure for low-frequency and broadband noise reduction in the first embodiment of the present invention;

[0032] Figure 7 is a top view of the acoustic structural component in the second element of the first embodiment of the present invention;

[0033] Figure 8 yes Figure 7 Cross-sectional view along direction BB;

[0034] Fig. 9 is a perspective view of an acoustic structure for low-frequency and broadband noise reduction in Embodiment 2 of the present invention;

[0035] Fig.10 is a top view of the acoustic structure for low-frequency and broadband noise reduction in Embodiment 3 of the present invention;

[0036] Fig.11 is a first perspective view of the third acoustic structural member in the third embodiment of the present invention;

[0037] Fig.12 is a second viewing angle diagram of the third acoustic structural member in the third embodiment of the present invention;

[0038] Fig.13 is a top view of the acoustic structure for low-frequency and broadband noise reduction in the fourth embodiment of the present invention;

[0039] Fig.14 It is a step diagram of the design method of the acoustic structure of the present invention.

[0040] In the figure:

[0041] 100, first primitive; 200, second primitive;

[0042] 1. Acoustic structural part; 11. Through-hole panel; 111. Micropore; 12. Structural part body; 121. Connection notch;

[0043] 2. Embedded parts. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] Embodiment 1

[0049] In order to enhance the low-frequency noise reduction capability and broaden the low-frequency sound elimination band, this embodiment provides a low-frequency, broadband noise reduction acoustic structure.

[0050] The acoustic structure for low-frequency, broadband noise reduction includes multiple acoustic structural parts 1 and embedded parts 2. The multiple acoustic structural parts 1 are each provided with a resonance chamber, and are provided with at least one microhole 111 connected to the resonance chamber. The embedded part 2 is a hollow structure with open ends. At least one embedded part 2 is penetrated by multiple acoustic structural parts 1. On the same embedded part 2, the acoustic structural parts 1 connected to the open ends of the embedded part 2 are arranged in pairs, and together with the embedded part 2, they constitute a first element 100. At least one acoustic structural part 1 not connected to the embedded part 2 is provided between two acoustic structural parts 1 connected to the embedded part 2. The acoustic structural part 1 not connected to the embedded part 2 is a second element 200. The first element 100 and the second element 200 are arranged in parallel.

[0051] In this embodiment Figures 1 to 8 In the embodiment, the acoustic structure for low-frequency and broadband noise reduction includes four acoustic structural members 1 and one embedded member 2, wherein two acoustic structural members 1 are arranged at both ends of the embedded member 2 and are connected to the embedded member 2, and the other two acoustic structural members 1 are not connected to the embedded member 2 and are arranged between the two acoustic structural members 1 connected to the embedded member 2. The embedded member 2 and the two acoustic structural members 1 connected to the embedded member 2 together constitute a first primitive 100, and the other two acoustic structural members 1 not connected to the embedded member 2 constitute a second primitive 200. The first primitive 100 and the second primitive 200 are arranged in parallel, and there is no sound wave flowing into the second primitive 200 from the embedded member 2. In this embodiment, the resonant chamber is a Helmholtz resonant chamber.

[0052] Optionally, the acoustic structural component 1 includes a through-hole panel 11 and a structural component body 12, the structural component body 12 is a hollow shell with a single-side opening, the structural component body 12 is provided with at least one connecting notch 121 matching the outer shape of the embedded component 2, the through-hole panel 11 is covered on the open part of the structural component body 12 to form a resonance chamber, and the micropores 111 are provided on the through-hole panel 11.

[0053] By providing at least one connection notch 121 matching the outer shape of the embedded component 2 on the structural component body 12, it is convenient for the embedded component 2 to be inserted into multiple acoustic structural components 1. In this embodiment, a connection notch 121 is provided on the structural component body 12 of the acoustic structural component 1 connected with the embedded component 2, and the end of the embedded component 2 extends into the resonance chamber through the connection notch 121; two oppositely arranged connection notches 121 are provided on the structural component body 12 of the acoustic structural component 1 not connected with the embedded component 2, and the embedded component 2 is inserted and exited through the two opposite connection notches 121. The number of micropores 111 provided on the through-hole panel 11 can be freely set according to demand. In this embodiment, a micropore 111 is provided on the through-hole panel 11 of the acoustic structural component 1 connected with the embedded component 2, and three micropores 111 are provided on the through-hole panel 11 of the acoustic structural component 1 not connected with the embedded component 2.

[0054] Optionally, the porosity of the through-hole panels 11 of the two acoustic structural members 1 connected at both ends of the embedded member 2 is the same, so as to allow the sound waves to couple and resonate in the two acoustic structural members 1 connected by the embedded member 2, thereby broadening the sound-absorbing frequency band at a certain resonance frequency in the low-frequency range.

[0055] In this embodiment, since the two acoustic structural members 1 connected by the embedded member 2 are arranged in pairs and have the same porosity, the manufacturing materials, structural shapes and dimensions of the two acoustic structural members 1, as well as the number, geometric dimensions and layout of the micropores 111 are all consistent. Among the four acoustic structural members 1 provided in this embodiment, the two acoustic structural members 1 that are not connected to the embedded member 2 are also arranged in pairs, and their manufacturing materials, structural shapes and dimensions, as well as the number, geometric dimensions and layout of the micropores 111 are all consistent.

[0056] Optionally, the porosity of the through-hole panel 11 of the acoustic structure member 1 connected to the inner insert 2 is different from that of the through-hole panel 11 of the acoustic structure member 1 not connected to the inner insert 2. By making the porosity of the through-hole panel 11 of the acoustic structure member 1 connected to the inner insert 2 different from the porosity of the through-hole panel 11 of the acoustic structure member 1 not connected to the inner insert 2, the acoustic structure generates two different sound-absorbing bands at the resonance frequencies in the low-frequency range, thereby widening the low-frequency sound-absorbing band.

[0057] Optionally, the end of the inner insert 2 extends in the resonance chamber of the acoustic structure 1 connected to the inner insert 2, but does not abut against the inner wall of the resonance chamber, thereby ensuring that sound waves can propagate in the inner insert 2 and making the newly generated sound-absorbing frequency band close to the resonance frequency of the acoustic structure 1 arranged in pairs.

[0058] Optionally, when multiple embedded parts 2 are inserted into multiple acoustic structural parts 1, the multiple embedded parts 2 have the same or different cross-sectional shapes. By inserting multiple embedded parts 2 with the same or different cross-sectional shapes into multiple acoustic structural parts 1, low-frequency sound-absorbing bands with different bandwidths can be constructed through different combinations, thereby widening the low-frequency sound-absorbing band.

[0059] Optionally, the cross-sectional shape of the micropore 111 is circular, elliptical, or polygonal; the cross-sectional shape of the resonance chamber is polygonal or circular; the longitudinal cross-sectional shape of the embedded component 2 is polygonal, semicircular, or semi-elliptical. A low-frequency sound-absorbing band that meets the structural design can be obtained through a variety of optional shapes. In this embodiment, the cross-sectional shape of the micropore 111 is circular, the cross-sectional shape of the resonance chamber is a regular hexagon, and the longitudinal cross-sectional shape of the embedded component 2 is rectangular.

[0060] Fig. 9 The second embodiment is shown, wherein the components identical or corresponding to those of the first embodiment are marked with the corresponding reference numerals of the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment are described.

[0061] The difference is that in the second embodiment, the acoustic structure is provided with three acoustic structural members 1 and one embedded member 2, wherein two acoustic structural members 1 are provided at both ends of the embedded member 2 and are connected to the embedded member 2, and the remaining acoustic structural member 1 is provided between the two acoustic structural members 1 connected to the embedded member 2 and is not connected to the embedded member 2. At this time, the two acoustic structural members 1 connected to the embedded member 2 and the embedded member 2 together constitute the first primitive 100, and the acoustic structural member 1 not connected to the embedded member 2 is the second primitive 200. In this embodiment, the longitudinal section of the embedded member 2 is a triangle, and the acoustic structural members 1 in the first primitive 100 are each provided with a microhole 111 and a connection notch 121, and the acoustic structural member 1 in the second primitive 200 is provided with four microholes 111 and two oppositely arranged connection notches 121.

[0062] Embodiment 3

[0063] Figures 10 to 12 The third embodiment is shown, wherein the components identical or corresponding to those in the first and second embodiments are marked with the corresponding reference numerals in the first and second embodiments. For simplicity, only the differences between the third embodiment and the first and second embodiments are described.

[0064] The difference is that in the third embodiment, the acoustic structure is provided with four acoustic structural members 1 and two embedded members 2, wherein one embedded member 2 is responsible for connecting the acoustic structural members 1 located at the first and third positions, and the embedded member 2 and the acoustic structural members 1 located at the first and third positions form a first primitive 100, and at this time, the acoustic structural member 1 located at the second position is not connected with the embedded member 2, and is a second primitive 200 in the structure;

[0065] Another embedded component 2 is responsible for connecting the second and fourth acoustic structural components 1, and the embedded component 2 and the second and fourth acoustic structural components 1 form a first unit 100. At this time, the acoustic structural component 1 located at the third position is not connected to the embedded component 2, and is a second unit 200 in the structure. In this embodiment, two first units 100 and two second units 200 can be divided. One more embedded tube 2 can make the acoustic structure produce a new sound-absorbing frequency band.

[0066] In this embodiment, the longitudinal section of the embedded component 2 is rectangular, the first and fourth acoustic structural components 1 are provided with a connecting notch 121, the second and third acoustic structural components 1 are provided with three connecting notches 121, and because the two acoustic structural components 1 connected by the embedded component 2 are arranged in pairs, the first and third acoustic structural components 1 are provided with a microhole 111, and the second and fourth acoustic structural components 1 are provided with two microholes 111.

[0067] Embodiment 4

[0068] Fig.13 The fourth embodiment is shown, wherein the components identical or corresponding to those of the first, second and third embodiments are marked with the corresponding reference numerals of the first, second and third embodiments. For simplicity, only the differences between the fourth embodiment and the first, second and third embodiments are described.

[0069] The difference is that in the acoustic structure of the fourth embodiment, when there are multiple acoustic structural members 1 not connected to the embedded member 2, the porosity of the through-hole panels 11 and the cross-sectional shape of the micropores 111 of the multiple acoustic structural members 1 not connected to the embedded member 2 may be different.

[0070] In this embodiment, the low-frequency, broadband noise reduction acoustic structure includes four acoustic structural members 1 and an embedded member 2, wherein two acoustic structural members 1 are arranged at both ends of the embedded member 2 and are connected to the embedded member 2, and the other two acoustic structural members 1 are not connected to the embedded member 2 and are arranged between the two acoustic structural members 1 connected to the embedded member 2. The embedded member 2 and the two acoustic structural members 1 connected to the embedded member 2 together constitute a first primitive 100, and the remaining two acoustic structural members 1 not connected to the embedded member 2 constitute a second primitive 200, wherein the two acoustic structural members 1 in the first primitive 100 are each provided with a micro hole 111, and one of the two acoustic structural members 1 in the second primitive 200 is provided with two micro holes 111, and the other is provided with three micro holes 111. The different acoustic structural members 1 in the second primitive will construct a new resonance silencing frequency band, which can broaden the bandwidth of the low-frequency silencing frequency band.

[0071] In order to obtain the above-mentioned low-frequency, broadband noise reduction acoustic structure, a design method of an acoustic structure is also provided, such as Fig.14 As shown, the design method of the acoustic structure includes the following steps:

[0072] S1: obtaining the structural dimensions, the number and corresponding diameters of the plurality of acoustic structural members 1 in the first primitive 100 and the second primitive 200, and the arrangement of the first primitive 100 and the second primitive 200, so as to generate a structural model after the acoustic structural members 1 are combined;

[0073] S2: Construct the sound absorption function of the required sound frequency band according to the structural model;

[0074] S3: Based on the sound absorption function, the required sound absorption spectrum is formulated according to the design requirements, and the size parameters of the embedded component 2 that meets the sound absorption requirements are found by using the optimization algorithm. The embedded component 2 is combined with the acoustic structural component 1 in the structural model to construct the corresponding first primitive 100 and second primitive 200, and generate an overall model of the acoustic structure with low frequency and broadband noise reduction;

[0075] S4: Further adjust the size parameters of the overall model, the number and position of the embedded parts 2, so that the low-frequency, broadband noise reduction acoustic structure meets the design requirements.

[0076] By adopting the above method to design the acoustic structure of low-frequency, broadband noise reduction, its various parameters are accurate and reasonable, thereby ensuring that the acoustic structure of low-frequency, broadband noise reduction meets the design requirements, so as to obtain a wider low-frequency sound absorption band and better sound absorption effect.

[0077] Optionally, in step S3, the optimization algorithm is a reinforcement learning algorithm or a genetic algorithm.

[0078] Optionally, in step S4 , the dimensional parameters that can be used for adjustment in the overall model include the structural dimensions of the acoustic structural component 1 in the first element 100 and the second element 200 , the number, diameter and arrangement of the microholes 111 , and the dimensional parameters of the embedded component 2 .

[0079] Since the acoustic structure of the low-frequency, broadband noise reduction is simple and easy to manufacture, after the relevant parameters of the acoustic structure of the low-frequency, broadband noise reduction are set by the above-mentioned design method, it can be manufactured by traditional forming methods or integrated molding using additive manufacturing technology.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the theories and principles of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An acoustic structure for low-frequency, broadband noise reduction, characterized in that: The invention comprises a plurality of acoustic structural members (1) and an embedded member (2), wherein each of the plurality of acoustic structural members (1) is provided with a resonance chamber and is provided with at least one microhole (111) connected to the resonance chamber, wherein the embedded member (2) is a hollow structure with two ends open, wherein at least one embedded member (2) is inserted into the plurality of acoustic structural members (1), wherein on the same embedded member (2), the acoustic structural members (1) connected to the open ends of the embedded member (2) are arranged in pairs and together with the embedded member (2) form a first unit (100), wherein at least one acoustic structural member (1) not connected to the embedded member (2) is arranged between two acoustic structural members (1) connected to the embedded member (2), wherein the acoustic structural member (1) not connected to the embedded member (2) is a second unit (200), and the first unit (100) and the second unit (200) are arranged in parallel.

2. The low-frequency, broadband noise reduction acoustic structure according to claim 1, characterized in that: The acoustic structural component (1) comprises a through-hole panel (11) and a structural component body (12); the structural component body (12) is a hollow shell with a single-side opening; the structural component body (12) is provided with at least one connecting notch (121) matching the outer shape of the embedded component (2); the through-hole panel (11) is covered at the opening of the structural component body (12) to form the resonance chamber; and the micropores (111) are provided on the through-hole panel (11).

3. The low-frequency, broadband noise reduction acoustic structure according to claim 2, characterized in that: The porosity of the through-hole panels (11) of the two acoustic structural members (1) connected to both ends of the embedded member (2) is the same.

4. The low-frequency, broadband noise reduction acoustic structure according to claim 2, characterized in that: The porosity of the through-hole panel (11) of the acoustic structural member (1) in communication with the inner insert (2) and that of the acoustic structural member (1) not in communication with the inner insert (2) are different.

5. The low-frequency, broadband noise reduction acoustic structure according to any one of claims 1 to 4, characterized in that: The end of the inner embedment (2) extends in the resonance chamber of the acoustic structural component (1) which is in communication with the inner embedment (2), but does not abut against the inner wall of the resonance chamber.

6. The low-frequency, broadband noise reduction acoustic structure according to any one of claims 1 to 4, characterized in that: When a plurality of the inner embedded parts (2) are inserted into a plurality of the acoustic structural parts (1), the plurality of the inner embedded parts (2) have the same or different cross-sectional shapes.

7. The low-frequency, broadband noise reduction acoustic structure according to any one of claims 1 to 4, characterized in that: The cross-sectional shape of the micropore (111) is circular, elliptical, or polygonal; The cross-sectional shape of the resonance chamber is polygonal or circular; The longitudinal cross-section of the embedded component (2) is polygonal, semicircular, or semi-elliptical.

8. A method for designing an acoustic structure, characterized in that: The method for designing an acoustic structure is used to design an acoustic structure for low-frequency, broadband noise reduction as described in any one of claims 1 to 7, comprising the following steps: S1: obtaining the structural dimensions of the plurality of acoustic structural components (1) and the number and diameter of the microholes (111) opened on the plurality of acoustic structural components (1), and generating a structural model of the combination of the plurality of acoustic structural components (1); S2: constructing a sound absorption function of a required sound frequency band according to the structural model; S3: Based on the sound absorption function, a required sound absorption spectrum is formulated according to design requirements, and the size parameters of the embedded component (2) that meet the sound absorption requirements are found using an optimization algorithm, and the embedded component (2) is combined with the acoustic structural component (1) in the structural model to generate an overall model of the low-frequency, broadband noise reduction acoustic structure; S4: Further adjusting the size parameters of the overall model, the number and position of the embedded parts (2), so that the low-frequency, broadband noise reduction acoustic structure meets the design requirements.

9. The method for designing an acoustic structure according to claim 8, characterized in that: In step S3, the optimization algorithm is a reinforcement learning algorithm or a genetic algorithm.

10. The method for designing an acoustic structure according to claim 8, characterized in that: In step S4, the dimensional parameters that can be used for adjustment in the overall model include the structural dimensions of the plurality of acoustic structural components (1), the number, diameter and arrangement of the microholes (111) provided on the acoustic structural component (1), and the dimensional parameters of the embedded component (2).

Images