Acoustic superstructure composite unit and glass curtain wall

Abstract

The invention relates to the technical field of building external envelope structures and green building energy conservation, in particular to an acoustic super-structure composite unit and a glass curtain wall, the acoustic super-structure composite unit comprises a first substrate, a second substrate and a middle substrate arranged between the first substrate and the second substrate; a local resonance module is arranged on the middle-layer substrate; a through hole is formed in the middle-layer substrate; a frame structure is further included; a first convex edge and a second convex edge are arranged on the frame structure; by integrating the photovoltaic module, the local resonance module, the middle-layer substrate and the thermal insulation layer formed by aerogel, on the premise that the thickness and the weight are not remarkably increased, the problem of function mutual exclusion among broadband noise pollution, heat loss and energy self-sufficiency is solved, and the thermal insulation effect is improved. And collaborative improvement of multi-physical field performance is realized.

Description

Technical Field

[0001] This invention relates to the field of building envelope and green building energy-saving technology, and in particular to an acoustic metastructure composite unit and a glass curtain wall. Background Technology

[0002] As an external building envelope, glass curtain walls have a significant impact on the building's indoor acoustic environment and thermal insulation. On the one hand, broadband vibration noise (especially low-frequency noise with strong penetrating power) generated by urban traffic is transmitted into the building through glass curtain walls, seriously affecting the comfort of the indoor acoustic environment. Long-term exposure to such noise can cause irreversible damage to human health. On the other hand, energy is transferred and exchanged between the building's interior and exterior through glass curtain walls, resulting in high energy consumption for cooling in summer and heating in winter, which runs counter to the requirements of green buildings.

[0003] Traditional noise reduction technology based on the mass law and the principle of multi-layer sound insulation has been designed and applied in the curtain wall field. Its basic idea is to block the propagation of sound waves by increasing the thickness of glass, setting hollow layers or laminated layers, and using the acoustic impedance of different media to adapt and attenuate sound energy.

[0004] Therefore, in order to effectively isolate vibration and noise in the traffic environment and reduce building energy consumption, the surface density of glass needs to be increased significantly, or energy transfer and exchange need to be isolated by stacking multiple layers. However, excessive thickness and weight not only significantly increase the cost of glass curtain walls, but also have an adverse effect on the load-bearing capacity of the main building structure.

[0005] To address this, an acoustic metastructure composite unit and glass curtain wall are proposed. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is that existing glass curtain walls cannot simultaneously meet the requirements of broadband vibration reduction and noise reduction as well as high-efficiency heat preservation and energy saving without significantly increasing thickness and weight.

[0007] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes an acoustic meta-composite unit, including a first substrate and a second substrate, and an intermediate substrate disposed between the first substrate and the second substrate; A local resonance module is provided on the middle layer substrate; The middle layer substrate has perforations.

[0008] In a preferred embodiment of the acoustic meta-composite unit of the present invention: the local resonance module includes a first oscillator soft material, an oscillator hard material, and a second oscillator soft material connected in sequence.

[0009] In a preferred embodiment of the acoustic metastructure composite unit of the present invention: the local resonance module further includes a rigid outer frame, and the first oscillator soft material, the oscillator hard material and the second oscillator soft material connected in sequence are disposed within the rigid outer frame.

[0010] In a preferred embodiment of the acoustic metastructure composite unit of the present invention: the rigid outer frame is disposed through the middle substrate, and a flexible sealing connector is provided between the rigid outer frame and the middle substrate.

[0011] In a preferred embodiment of the acoustic meta-composite unit of the present invention: at least five local resonance modules are provided, and their distribution positions correspond to the antinode positions of the vibration modes of the middle substrate. Specifically, one of the local resonance modules can be set to be located at the geometric center of the middle layer substrate, and the other local resonance modules are located at the extension lines of the central cross. The distribution of the local resonance modules corresponds to the antinodes of the first three vibration modes of the middle substrate, so as to achieve concentrated suppression of the first three low-frequency vibrations.

[0012] The distribution of the local resonance modules can also be central, uniform, or edge-arranged.

[0013] In a preferred embodiment of the acoustic metastructure composite unit of the present invention: an inner frame is provided outside the middle substrate, and the two sides of the inner frame are respectively attached to the first substrate and the second substrate.

[0014] In a preferred embodiment of the acoustic meta-composite unit of the present invention: aerogel is provided on the first substrate; The aerogel has an inner substrate.

[0015] The beneficial effects of this invention are as follows: by converting the low-frequency vibration of the glass substrate into oscillator kinetic energy through several local resonance modules, the radiated low-frequency noise is reduced; by converting the mid-to-high frequency acoustic energy into heat energy through the perforations on the middle substrate, the dual high-efficiency blocking of low-frequency structural noise and mid-to-high frequency air noise is achieved. This overcomes the problem of the thickness of traditional curtain walls due to the limitation of the mass law, as well as the narrow noise reduction bandwidth of single metamaterials, and significantly broadens the noise reduction bandwidth, making the prepared curtain wall lighter and cheaper.

[0016] The present invention also proposes a glass curtain wall, including the aforementioned acoustic meta-composite unit and a frame structure; The frame structure is provided with a first protruding edge and a second protruding edge; The acoustic meta-composite unit is located within the frame structure.

[0017] In a preferred embodiment of the glass curtain wall described in this invention: the first substrate, the second substrate, and the middle substrate are all made of transparent material.

[0018] In a preferred embodiment of the glass curtain wall of the present invention: a photovoltaic panel is provided on the second substrate; The photovoltaic panel is laid at the boundary connection between the second substrate and the frame structure.

[0019] The beneficial effects of this invention are as follows: by integrating photovoltaic modules, local resonant modules, intermediate substrates and a thermal insulation layer composed of aerogel, the functional mutual exclusion problem between broadband noise pollution, heat loss and energy self-sufficiency is solved without significantly increasing the thickness and weight, and the synergistic improvement of multi-physics performance is achieved. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0021] Figure 1 A schematic diagram of the overall structure of the glass curtain wall is shown.

[0022] Figure 2 A schematic diagram of the internal structure of the glass curtain wall is shown.

[0023] Figure 3 A schematic diagram of the cross-sectional structure of the glass curtain wall is shown.

[0024] Figure 4 A schematic diagram of the distribution structure of the middle substrate and local resonant module of the acoustic meta-composite unit is shown.

[0025] Figure 5 A schematic diagram of the photovoltaic panels and their circuit system in the glass curtain wall is shown.

[0026] Figure 6 Vibration characteristic diagrams of different arrangements of local resonance modules are shown.

[0027] In the figure: 1. First substrate; 2. Second substrate; 3. Middle substrate; 31. Perforation; 32. Inner frame; 4. Local resonance module; 41. First oscillator soft material; 42. Oscillator hard material; 43. Second oscillator soft material; 44. Rigid outer frame; 5. Aerogel; 6. Inner substrate; 7. Frame structure; 71. First protrusion; 72. Second protrusion; 73. Standardized slot; 74. Output interface; 8. Photovoltaic panel; 81. Circuit system. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0029] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0030] Reference Figures 1-6 This embodiment provides an acoustic metastructure composite unit, including a first substrate 1 and a second substrate 2, and an intermediate substrate 3 disposed between the first substrate 1 and the second substrate 2; the intermediate substrate 3 is provided with a local resonance module 4; wherein, multiple local resonance modules 4 are provided, and the local resonance modules 4 are used to dissipate the low-frequency vibration energy of the structure through resonance, thereby achieving low-frequency vibration reduction and noise reduction.

[0031] The middle substrate 3 has perforations 31. It should be noted that the surface of the middle substrate 3 has several evenly distributed perforations 31. The middle substrate 3 and the perforations 31 constitute a micro-perforated plate. The perforations 31 on the middle substrate 3 utilize the acoustic impedance effect. When the mid-to-high frequency sound waves pass through the perforations 31, the air and the hole wall rub against each other, converting the sound energy into heat energy, thereby achieving mid-to-high frequency noise reduction.

[0032] By using several local resonance modules 4, the low-frequency vibration of the structure is converted into oscillator kinetic energy and dissipated to achieve low-frequency vibration reduction and noise reduction. The mid-to-high frequency acoustic energy is converted into heat energy through the perforations 31 on the middle substrate 3, thus achieving dual and efficient isolation of low-frequency structural noise and mid-to-high frequency air noise. This overcomes the problem of the traditional curtain wall being too heavy due to the limitation of the mass law, as well as the narrow noise reduction bandwidth of a single metamaterial. It significantly broadens the noise reduction bandwidth, making the prepared curtain wall lighter and cheaper.

[0033] As an optional embodiment: the local resonance module 4 includes a first oscillator soft material 41, an oscillator hard material 42, and a second oscillator soft material 43 connected in sequence.

[0034] In this embodiment, the first oscillator soft material 41 and the second oscillator soft material 43 can be springs, rubber columns, magnetic levitation structures, as long as they can provide elastic restoring force. The oscillator hard material 42 can be a cylindrical structure, or it can be designed as a ring, sphere or other geometric shape to adjust the resonant frequency. The oscillator hard material 42 can be metal or high-density resin block.

[0035] The first oscillator soft material 41, the oscillator hard material 42, and the second oscillator soft material 43 are connected sequentially by adhesive bonding.

[0036] As an optional embodiment, the local resonance module 4 also includes a rigid outer frame 44, and the first oscillator soft material 41, the oscillator hard material 42 and the second oscillator soft material 43 connected in sequence are disposed inside the rigid outer frame 44.

[0037] The rigid outer frame 44 is made of silicone rubber. After the first oscillator soft material 41, the oscillator hard material 42 and the second oscillator soft material 43 are bonded together, the two ends of the first oscillator soft material 41 and the second oscillator soft material 43 are respectively bonded to the inner wall of the rigid outer frame 44, so that the oscillator hard material 42 remains in a suspended state.

[0038] It should be noted that the rigid outer frame 44 is a fully enclosed structure, and the first oscillator soft material 41, the oscillator hard material 42, and the second oscillator soft material 43 are located inside the enclosed structure.

[0039] As an optional embodiment: the rigid outer frame 44 is disposed through the middle substrate 3, and a flexible sealing connector is provided between the rigid outer frame 44 and the middle substrate 3.

[0040] Preferably, the middle substrate 3 is disposed on a predetermined plane in the thickness direction of the rigid outer frame 44, such as the bisector plane in the thickness direction.

[0041] The flexible sealing connector is a highly elastic transparent silicone ring or other elastic damping material, such as a rubber sealing strip.

[0042] During preparation, a high-strength glass substrate is selected as the second substrate 2, and it is cleaned and surface activated. The first substrate 1 is a transparent back plate, which can be made of glass. The first oscillator soft material 41, the oscillator hard material 42, and the second oscillator soft material 43 are bonded together in sequence and then bonded to the rigid outer frame 44. The rigid outer frame 44 is embedded in the pre-opened embedding groove of the middle substrate 3. The gap between the two is filled with a flexible sealing connector to ensure that there is no gap between the two and the middle substrate 3 is stable and can be used to block the sound bridge. Then, the middle substrate 3 and the local resonance module 4 are sandwiched between the first substrate 1 and the second substrate 2. The surfaces of the two ends of the rigid outer frame 44 of the local resonance module 4 are bonded to the opposite sides between the first substrate 1 and the second substrate 2.

[0043] The flexible sealing connector is configured to both allow the local resonant module 4 to vibrate independently relative to the middle substrate 3 at the resonant frequency, and to block airflow on both sides of the middle substrate 3 to maintain the sound pressure difference.

[0044] It should be noted that sound waves can only propagate through the perforations 31 on the middle substrate 3. During the process of passing through, energy is dissipated by friction on the middle substrate 3 and its perforations 31, thereby silencing the sound. Therefore, a sound pressure difference will be generated on both sides of the middle substrate 3.

[0045] The “sealed soft connection” between the middle substrate 3 and the rigid outer frame 44 ensures the airtightness of the sound-absorbing cavity of the middle substrate 3, which can prevent sound leakage and enable the system to achieve wide-bandwidth high-efficiency noise reduction with an extremely thin thickness.

[0046] As an optional embodiment: the middle layer substrate 3 is provided with an inner frame 32 on the outside, and the two sides of the inner frame 32 are respectively attached to the first substrate 1 and the second substrate 2.

[0047] In this embodiment, the middle substrate 3 and the local resonance module 4 are externally encapsulated with a transparent inner frame 32. The inner frame 32 can be made of glass. The inner frame 32 is used to encapsulate the whole consisting of the middle substrate 3 and the local resonance module 4. Then, the inner frame 32 is sandwiched between the opposite sides of the first substrate 1 and the second substrate 2 for bonding connection.

[0048] As an optional embodiment: at least five local resonance modules 4 are provided, and their distribution positions correspond to the antinode positions of the vibration modes of the middle substrate 3; Specifically, refer to Figure 4 One of the local resonance modules 4 can be set to be located at the geometric center of the middle substrate 3, and the other local resonance modules 4 are located at the extension line of the central cross; this distribution method is a cross-shaped arrangement.

[0049] The distribution of the local resonance module 4 can also be arranged in a central, uniform, or edge manner.

[0050] The central arrangement is a rectangular arrangement concentrated in the geometric center region of the middle layer substrate 3.

[0051] The uniform arrangement is a periodic array or grid-like distribution on the entire surface of the middle layer substrate 3.

[0052] The edge arrangement is distributed along the periphery of the outer edge of the middle layer substrate 3.

[0053] The distribution of the local resonance module 4 corresponds to the antinodes of the first three vibration modes of the middle substrate 3, so as to achieve concentrated suppression of the first three low-frequency vibrations.

[0054] Compared to center-arrangement, uniform-arrangement, and edge-arrangement, the cross-shaped arrangement of the local resonance module 4 demonstrates superior vibration reduction performance, such as... Figure 6As shown, by comparing the mean square vibration velocity level response of different arrangement methods in the frequency domain from 1Hz to 400Hz, this invention further verifies the comprehensive vibration reduction advantage of the cross-shaped arrangement in a wide frequency domain.

[0055] Because the edge arrangement is located near the vibration node at the boundary of the middle substrate 3, it cannot effectively dissipate the energy of the main mode, resulting in a very large resonance peak near 25Hz, with a mean square velocity level as high as 148dB. In contrast, the velocity level at this frequency point is reduced to about 113dB when using the cross-shaped arrangement, achieving a significant attenuation of about 35dB. This demonstrates that the cross-shaped arrangement has a much better control capability over the key low-frequency modes than the edge arrangement.

[0056] While the uniform arrangement provides broad coverage, it exhibits significant vibration amplification around 16Hz, with a mean square velocity level reaching 139dB. In contrast, the cross-shaped arrangement in this embodiment has a mean square velocity level of only about 113dB at this frequency, a reduction of approximately 26dB. This demonstrates that the cross-shaped arrangement, through precise antinode coverage, avoids the mass redundancy that would occur in a uniform arrangement where some elements are located at non-antinode positions.

[0057] Furthermore, a comparative analysis of the central arrangement and the cross-shaped arrangement is as follows: In specific low-frequency ranges (such as 100Hz to 125Hz), the center arrangement exhibits better vibration reduction, with the mean square velocity level decreasing to around 100dB. This is because, within this frequency range, the vibration of the middle substrate 3 is dominated by the first-order mode, and the antinode of the first-order mode is located precisely at the geometric center of the middle substrate 3. However, as the frequency extends to higher frequencies (such as the 200Hz to 400Hz range), the vibration modes of the middle substrate 3 gradually become more complex, with the second and third-order modes beginning to dominate. Their antinodes shift outwards from the center, resulting in a significant weakening of the control capability of the center-only arrangement. Specifically, around 250Hz, the mean square velocity level of the center arrangement rises back to over 120dB.

[0058] In contrast, the cross-shaped arrangement used in this embodiment precisely corresponds to the first three vibration modes of the middle substrate 3 in terms of spatial topology: its central local resonance module 4 controls the first mode, and the local resonance module 4 at the extension line of the central cross covers the antinodes of the second and third modes. Specifically, the optimal vibration reduction frequency band of the cross-shaped arrangement is mainly concentrated in the low-frequency range of 31.5Hz to 63Hz and the mid-frequency range of 200Hz to 315Hz. Its mean square velocity level drops to about 103dB at 63Hz and to about 111dB at 315Hz. The above data show that the cross-shaped arrangement significantly broadens the effective vibration reduction frequency band while maintaining the fundamental frequency control capability.

[0059] In summary, the edge arrangement has limited energy dissipation due to its proximity to the vibration nodes at the boundary of the middle substrate 3, while the uniform arrangement suffers from mass redundancy. Furthermore, compared to the center arrangement which only targets the fundamental frequency, the cross-shaped arrangement not only covers the first-order mode antinodes at the geometric center of the middle substrate 3, but also more precisely matches the antinode distributions of the second and third-order modes, thereby achieving coordinated control of the first three key vibration modes and effectively reducing resonance peaks across multiple frequency bands.

[0060] This invention solves the problem of narrow bandwidth in single-mechanism noise reduction by designing the local resonance module 4 and the middle substrate 3 through spatial nesting and coupling. At the same time, it avoids the structural bulkiness caused by simply increasing the thickness, and achieves wideband and efficient noise reduction in an ultra-thin structure.

[0061] As an optional embodiment: an aerogel 5 is provided on the first substrate 1; an inner substrate 6 is provided on the aerogel 5.

[0062] The inner substrate 6 and the first substrate 1 sandwich the aerogel 5 in the middle, and a sealing strip is provided at the connection between the inner substrate 6 and the first substrate 1 to encapsulate and fix the aerogel 5.

[0063] Specifically, the preparation process is as follows: First, an inverted sealing strip and a hollow aluminum spacer are installed on the edge of the first substrate 1. Molecular sieve desiccant is filled in the spacer. High-transmittance transparent aerogel material is filled into the cavity formed by the first substrate 1 and the inner substrate 6. The aerogel particles can be compacted and filled or the aerogel whole plate can be embedded. The inner substrate 6 is covered on the spacer. After pressing, structural sealant is applied around the perimeter for a second seal to ensure airtightness.

[0064] In this embodiment, the aerogel 5 is a transparent aerogel with a light transmittance of more than 90%, preferably aerogel 302. Aerogel 302 has an extremely low thermal conductivity coefficient. Combined with the air cavity formed by the multi-layer panel, it effectively blocks the thermal bridge effect. The selected aerogel 302 has a light transmittance of more than 90%, ensuring natural lighting in the room and having good light transmittance.

[0065] In this embodiment, the first substrate 1, aerogel 5, and inner substrate 6 constitute a sound insulation structure. The aerogel 5 can also be replaced by a vacuum layer. The advantage of using aerogel is that it is low in cost and has a long service life.

[0066] The middle substrate 3 can be made of a transparent rigid material with high light transmittance, such as polycarbonate or polymethyl methacrylate, glass, transparent acrylic, PET film, etc., as a transparent substrate. The middle substrate 3 is drilled in an array to create perforations 31, thereby forming a transparent micro-perforated plate.

[0067] It should be noted that high-end noise-reducing and heat-insulating curtain walls on the market currently often use vacuum glass technology, utilizing a vacuum layer to block the transmission of sound and heat. However, vacuum glass has extremely high requirements for sealing processes, is difficult to manufacture, and is very expensive; moreover, with the increase in service life, the aging of the sealing material will lead to a decrease in the vacuum level, resulting in irreversible degradation of its noise reduction and heat insulation performance, and extremely high maintenance costs. This invention abandons the dependence on a high vacuum environment, and adopts a combination of a physical structure local resonance module 4 and a middle substrate 3 with a stable solid aerogel 5, which solves the reliability problem of vacuum curtain walls causing performance degradation due to sealing failure, reduces the difficulty of manufacturing processes, and extends the effective service life of the system.

[0068] When the glass curtain wall structure experiences low-frequency vibrations, the vibrations are transmitted through the rigid outer frame 44 to the first oscillator soft material 41, and then to the oscillator hard material 42. At this time, the mass-spring system composed of soft material-hard material-soft material undergoes local resonance. Near the resonance frequency, the vibration phase of the oscillator hard material 42 is out of phase with the vibration of the structure itself. Thus, through the "negative effective mass density" effect, the low-frequency vibration energy of the structure is converted into the kinetic energy of the oscillator hard material 42, which is ultimately dissipated by the damping of the first oscillator soft material 41 and the second oscillator soft material 43. At the same time, the intermediate substrate 3, which is set on the plane bisector of the thickness direction of the oscillator hard material 42, divides the cavity of the intermediate layer into two sub-cavities. The perforations 31 on the transparent intermediate substrate 3 utilize the acoustic impedance effect. When mid-to-high frequency sound waves pass through the perforations 31, the air and the hole walls rub against each other, converting the sound energy into heat energy.

[0069] Reference Figures 1-6 This embodiment proposes a glass curtain wall, including an acoustic meta-composite unit and a frame structure 7; the frame structure 7 is provided with a first protruding edge 71 and a second protruding edge 72; the acoustic meta-composite unit is disposed within the frame structure 7.

[0070] The acoustic metastructure composite unit is fixed by clamping the inner substrate 6 and the second substrate 2 with the first protrusion 71 and the second protrusion 72 to form a mechanical clamp.

[0071] As an optional embodiment: The first substrate 1, the second substrate 2, and the middle substrate 3 are all made of transparent material, which enables the curtain wall to have high light transmittance.

[0072] As an optional embodiment: A photovoltaic panel 8 is provided on the second substrate 2; it should be noted that a plurality of photovoltaic panels 8 are evenly distributed on the surface of the second substrate 2, as shown in the figure. Figure 5 The circuit systems 81 on each photovoltaic panel 8 are connected in series to form a photovoltaic module, which can be used to generate electricity.

[0073] Photovoltaic panels 8 are laid at the boundary connection between the second substrate 2 and the frame structure 7. The area where photovoltaic panels 8 are located is the non-visible area of ​​the glass curtain wall, while the central part of the space enclosed by photovoltaic panels 8 is the visible area, which can maintain good lighting function. The photovoltaic panels 8 on the outer perimeter not only provide clean electricity for the building, but also play an aesthetic role in shielding the frame sealing structure.

[0074] Preferably, the frame structure 7 is provided with a standardized slot 73, which is used to connect or install the curtain walls. The frame structure 7 is also provided with an output interface 74, which is connected to the output terminal of the circuit system 81. The photovoltaic power generation can be connected to the grid and utilized through the setting of the output interface 74.

[0075] It should be noted that traditional photovoltaic curtain walls often struggle to balance natural light and power generation. Furthermore, glass curtain walls are a major channel for heat loss from buildings. The comprehensive coverage of traditional photovoltaic curtain walls can lead to high energy consumption for both summer cooling and winter heating, which contradicts the requirements of current green building and "dual-carbon" goals. To achieve better sound insulation, especially for broadband vibration noise from traffic, particularly penetrating low-frequency noise, traditional glass curtain walls typically require significantly increased glass thickness or weight, resulting in a bulky structure. Conversely, introducing BIPV (Building Integrated Photovoltaics) modules to improve energy efficiency often sacrifices natural light or leads to significant thermal bridging, making it difficult to simultaneously meet the comprehensive requirements of green buildings for acoustic environment, thermal performance, and renewable energy utilization within a single system.

[0076] In summary, existing glass curtain walls struggle to address the multiple contradictions between broadband noise reduction, efficient heat preservation, lighting, and energy production. However, this invention solves the functional conflict between broadband noise pollution, heat loss, and energy self-sufficiency by integrating a heat preservation layer composed of photovoltaic modules, a local resonance module 4, a middle substrate 3, and aerogel 5, without significantly increasing thickness and weight, thus achieving a synergistic improvement in multi-physics performance.

[0077] By synergistically arranging high-transmittance aerogel 5 with photovoltaic panels 8 distributed around the perimeter, the contradiction between building lighting, thermal insulation, and energy production is resolved. While ensuring over 90% light transmittance, aerogel 5 cuts off thermal bridges. Combined with external photovoltaic power generation, this significantly reduces building air conditioning energy consumption while achieving energy self-sufficiency, thus significantly improving the green energy-saving benefits of the curtain wall.

[0078] The sealed soft connection between the middle substrate 3 and the local resonant module 4 avoids the "sound bridge" effect caused by rigid connection. This design ensures the airtightness of both sides of the middle substrate 3 to maintain sound absorption efficiency, and also ensures the independence of the local resonant module 4 during resonant movement, preventing vibration reduction failure caused by structural interference and maximizing acoustic performance within a limited thickness.

[0079] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. An acoustic metastructure composite unit, characterized in that: It includes a first substrate (1) and a second substrate (2), and an intermediate substrate (3) disposed between the first substrate (1) and the second substrate (2); The middle substrate (3) is provided with a local resonance module (4); The middle substrate (3) has a through hole (31).

2. The acoustic meta-composite unit according to claim 1, characterized in that: The local resonance module (4) includes a first oscillator soft material (41), an oscillator hard material (42), and a second oscillator soft material (43) connected in sequence.

3. The acoustic meta-composite unit according to claim 2, characterized in that: The local resonance module (4) also includes a rigid outer frame (44), and the first oscillator soft material (41), the oscillator hard material (42), and the second oscillator soft material (43) connected in sequence are disposed inside the rigid outer frame (44).

4. The acoustic meta-composite unit according to claim 3, characterized in that: The rigid outer frame (44) is disposed through the middle substrate (3), and a flexible sealing connector is provided between the rigid outer frame (44) and the middle substrate (3).

5. The acoustic meta-composite unit according to claim 4, characterized in that: The local resonance module (4) is provided in at least five parts, and its distribution position corresponds to the antinode position of the vibration mode of the middle substrate (3); Specifically, one of the local resonance modules (4) can be set to be located at the geometric center of the middle substrate (3), and the other local resonance modules (4) are located at the extension line of the central cross. The distribution position of the local resonance module (4) corresponds to the antinode position of the first three vibration modes of the middle substrate (3) in order to achieve concentrated suppression of the first three low-frequency vibrations.

6. The acoustic meta-composite unit according to claim 5, characterized in that: The middle substrate (3) is provided with an inner frame (32) on the outside, and the two sides of the inner frame (32) are respectively attached to the first substrate (1) and the second substrate (2).

7. The acoustic meta-composite unit according to any one of claims 1 to 6, characterized in that: Aerogel (5) is provided on the first substrate (1); The aerogel (5) is provided with an inner substrate (6).

8. A glass curtain wall, characterized in that: Includes the acoustic meta-composite unit as described in any one of claims 1 to 7, and the frame structure (7). The frame structure (7) is provided with a first protruding edge (71) and a second protruding edge (72); The acoustic meta-composite unit is located within the frame structure (7).

9. The glass curtain wall according to claim 8, characterized in that: The first substrate (1), the second substrate (2), and the middle substrate (3) are all made of transparent material.

10. The glass curtain wall according to claim 8, characterized in that: A photovoltaic panel (8) is provided on the second substrate (2); The photovoltaic panel (8) is laid at the boundary connection between the second substrate (2) and the frame structure (7).

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