CN216920770U - Ventilation metamaterial unit cell structure and ventilation sound barrier - Google Patents
Ventilation metamaterial unit cell structure and ventilation sound barrier Download PDFInfo
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Abstract
The application discloses a ventilation metamaterial unit cell structure and a ventilation sound barrier, wherein the ventilation metamaterial unit cell structure is a sub-wavelength hollow structure and comprises an outer shell, an inner shell and a sound insulation module, wherein the outer shell defines a first channel; the inner housing is disposed within the first channel, the inner housing defining a second channel, an inlet of the second channel adjacent to the inlet of the first channel, and an outlet of the second channel adjacent to the outlet of the first channel; the sound insulation module is connected with the inner wall of the outer shell and the outer wall of the inner shell, a third channel is formed between the outer shell and the inner shell by the sound insulation module, the inlet of the third channel is close to the inlet of the first channel, the outlet of the third channel is close to the outlet of the first channel, and the sound transmission path of the third channel is longer than that of the second channel. The method and the device have the advantages that based on the Fano-like interference effect, the effect of shielding external noise while allowing airflow and illumination to pass is achieved.
Description
Technical Field
The application relates to the technical field of noise treatment equipment, in particular to a ventilating metamaterial unit cell structure and a ventilating sound barrier.
Background
People often encounter the problems that opening a window is particularly noisy and closing the window is particularly sultry in daily life. Due to the contradiction between ventilation, light transmission and sound insulation performance, the high-efficiency broadband sound insulation performance of a miniaturized free flow structure is always a difficult problem in acoustic engineering application. The traditional sound absorber can sufficiently attenuate sound waves, but because the sound waves can be transmitted among any small holes, if the sound is isolated, a closed thick wall body is needed to isolate most of the sound waves, but the fluid flow is hindered.
Although various types of ventilated metamaterial absorbers with suitable noise reduction and ventilation, light irradiation properties have been discovered in recent years, they suffer from the disadvantages of small open area ratio and inefficient sound insulation. The acoustic metamaterial sound absorber has the advantages that a good balance point between ventilation and absorption performance is difficult to find, and the application of the acoustic metamaterial sound absorber in a ventilation environment is limited.
SUMMERY OF THE UTILITY MODEL
The application provides a ventilation metamaterial unit cell structure and ventilation sound barrier, can compromise the high-efficient circulation and the sound isolation of air. The technical scheme of the application is as follows:
in a first aspect of the present application, a ventilation metamaterial unit cell structure is provided, where the ventilation metamaterial unit cell structure is a sub-wavelength hollow structure, and includes:
a housing defining a first channel;
an inner shell disposed within the first channel, the inner shell defining a second channel having a centerline coincident with a centerline of the second channel, an inlet of the second channel being flush with the inlet of the first channel, an outlet of the second channel being flush with the outlet of the first channel;
the sound insulation module is connected with the inner wall of the outer shell and the outer wall of the inner shell, a third channel is formed between the outer shell and the inner shell, the inlet of the third channel is close to the inlet of the first channel, the outlet of the third channel is close to the outlet of the first channel, and the sound transmission path of the third channel is longer than that of the second channel.
In an optional implementation manner, the sound insulation module comprises a first partition plate, a second partition plate and at least one middle partition plate, wherein the first partition plate is provided with an introduction port, and the second partition plate is provided with a discharge port; the first partition plate is arranged at the inlet of the first channel, the second partition plate is arranged at the outlet of the first channel, and the at least one middle partition plate is positioned between the first partition plate and the second partition plate and arranged at intervals along the outer wall of the inner shell;
the leading-in port of the first clapboard is an inlet of the third channel, and the leading-out port of the second clapboard is an outlet of the third channel.
In an alternative implementation, the first partition, the at least one intermediate partition and the second partition are connected in sequence to form a spiral partition.
In an optional implementation manner, the first partition plate, the second partition plate and the middle partition plate are provided with notches, the notches of the first partition plate and the second partition plate are staggered with the notches of the adjacent middle partition plate, and the notches of the two adjacent middle partition plates are staggered with each other; the notch of the first clapboard is the leading-in port, and the notch of the second clapboard is the leading-out port.
In an optional implementation manner, the first partition plate, the second partition plate and the middle partition plate are provided with at least one through hole, the through holes of the first partition plate and the second partition plate are staggered with the through holes of the adjacent middle partition plate, and the through holes of the two adjacent middle partition plates are staggered with each other;
the through hole of the first partition board is the guide-in port, and the through hole of the second partition board is the guide-out port.
In an alternative implementation, the inner shell is concentric with the outer shell.
In an alternative implementation, the shape of the inner shell is circular, square, pentagonal, hexagonal, octagonal, fan-shaped, or heart-shaped; the shape of the shell is square, pentagonal, hexagonal, octagonal, fan-shaped, circular or heart-shaped.
In a second aspect of the present application, a ventilation sound barrier using the ventilation metamaterial unit cell structure described in the first aspect is provided, and includes multiple ventilation metamaterial unit cell structures, where the multiple ventilation metamaterial unit cell structures are spliced to form a sound insulation panel, and noise elimination frequencies of the ventilation metamaterial unit cell structures are the same or different.
In an alternative implementation, the shells of a plurality of ventilation metamaterial unit cell structures are spliced with each other or connected with each other through connecting pieces.
In an alternative implementation, the sound insulation panel further comprises a movable frame, and the sound insulation panel is arranged in the frame.
The technical scheme provided by the application at least brings the following beneficial effects:
the ventilation metamaterial unit cell structure is a sub-wavelength hollow structure, an inner shell of the ventilation metamaterial unit cell structure is provided with a first channel, a sound insulation module forms a third channel between the inner shell and an outer shell, airflow can pass through the first channel without obstruction, and good ventilation effect is achieved.
The utility model provides a ventilation metamaterial unit cell structure not only has the advantage of ventilation, printing opacity and noise suppression, still has the characteristics of simple structure, volume light and handy, easily concatenation equipment, can be applied to in indoor, building wall and the industry sound proof cover structure. The size of the unit cell structure of the ventilation metamaterial can be adjusted according to the voice frequency section to be restrained, and the restraining effect on the voice with specific frequency is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application and are not to be construed as limiting the application.
FIG. 1 is a front view of a ventilated metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 2 is a perspective view of a ventilated metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 3 is an elevation view of a ventilated metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 4 is a Comsol simulation result of a ventilated metamaterial unit cell structure shown in FIG. 1;
FIG. 5 is a comparison graph of Comsol simulation results of the ventilation and sound insulation units with different pitches shown in FIG. 1;
FIG. 6 is a perspective view of a ventilation metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 7 is a schematic structural view illustrating the assembly of a sound insulation module with an inner housing according to an exemplary embodiment;
FIG. 8 is a Comsol simulation result of one ventilation metamaterial unit cell structure shown in FIG. 6;
FIG. 9 is a comparison graph of Comsol simulation results of the ventilation metamaterial unit cell structure of different apertures shown in FIG. 6;
FIG. 10 is a perspective view of a ventilated metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 11 is a schematic structural view illustrating the assembly of a sound insulation module with an inner shell according to an exemplary embodiment;
FIG. 12 is an elevation view of a ventilated metamaterial unit cell structure shown in accordance with an exemplary embodiment;
FIG. 13 is a Comsol simulation result of one ventilation metamaterial unit cell structure shown in FIG. 10;
FIG. 14 is a comparison graph of Comsol simulation results for the ventilation metamaterial unit cell structure of the different dovetail openings shown in FIG. 10;
FIG. 15 is a schematic illustration of a sound insulating panel according to an exemplary embodiment;
FIG. 16 is a schematic diagram of a sound insulating panel according to an exemplary embodiment;
fig. 17 is a schematic diagram illustrating the construction of a ventilation sound barrier according to an exemplary embodiment.
In the figure: 100-ventilation metamaterial unit cell structure, 110-outer shell, 120-inner shell, 121-second channel, 130-sound insulation module, 131-first partition plate, 132-middle partition plate, 133-second partition plate, 134-third channel, 135-leading-in port, 136-leading-out port, 137-through hole, 138-notch, 200-frame and 300-sound insulation panel.
Detailed Description
In order to make the technical solutions of the present application better understood by those of ordinary skill in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
In prior art solutions, there has been a trade-off between the thickness of the acoustic barriers and their ventilation capabilities, limiting their potential for controlling broadband sound in high-ventilation environments. In general, sound insulation can be achieved by both active and passive methods. Compared to active methods, which require complex and expensive electronic systems, the use of passive structures provides a simple solution, which is easier to apply in practice. However, passive methods typically have to rely on impedance mismatch by inserting layered materials, which can be bulky in terms of wavelength if natural materials are used. While advances in metamaterials have overcome the problem of limited acoustic properties in nature and have resulted in substantial reductions in both the thickness and mass density of sound-insulating structures, such as the use of thin film type acoustic metamaterials, there is still a fundamental limitation that the insertion of natural or artificial materials necessarily results in discontinuities in the surrounding air, rendering them impractical in environments requiring ventilation, bulky, angle dependent, and unsuitable for use in free space.
The embodiment of the utility model provides a ventilating metamaterial unit cell structure and a ventilating sound barrier based on a Fano-like interference effect, and the ventilating metamaterial unit cell structure and the ventilating sound barrier achieve the effect of allowing air flow and illumination to pass and shielding external noise.
The ventilation metamaterial unit cell structure provided by the embodiment of the utility model is a sub-wavelength hollow structure and comprises an outer shell, an inner shell and a sound insulation module, wherein the outer shell defines a first channel; the inner shell is arranged in the first channel, the inner shell defines a second channel, the center line of the second channel is overlapped with the center line of the second channel, the inlet of the second channel is flush with the inlet of the first channel, and the outlet of the second channel is flush with the outlet of the first channel; the sound insulation module is connected with the inner wall of the outer shell and the outer wall of the inner shell, a third channel is formed between the outer shell and the inner shell by the sound insulation module, the inlet of the third channel is close to the inlet of the first channel, the outlet of the third channel is close to the outlet of the first channel, and the sound transmission path of the third channel is longer than that of the second channel.
Where subwavelength refers to periodic (or aperiodic) structures with characteristic dimensions comparable to or smaller than the operating wavelength. The sound insulation unit structure is designed to be a sub-wavelength hollow structure, so that the suppression effect on the working wavelength can be realized, the broadband sound insulation is realized in the sound shadow area, and the sound insulation efficiency is high.
The shape of the inner shell can be round, square, pentagonal, hexagonal, octagonal, fan-shaped, heart-shaped, and the like. The shape of the shell can be square, pentagonal, hexagonal, octagonal, fan-shaped, circular, heart-shaped and the like. The shapes of the inner shell and the outer shell can be the same or different. The wall thickness of each part on inner shell and the shell can be the same or different, under the same condition of wall thickness, the inner shell is concentric with the shell, under the different condition of wall thickness, the inner shell is not concentric with the shell, and only the center line coincidence of second passageway and first passageway needs to be ensured.
The sound insulation module comprises a first partition plate, a second partition plate and at least one middle partition plate, wherein the first partition plate is provided with an introducing port, and the second partition plate is provided with an outlet port; the first partition board is arranged at the inlet of the first channel, the second partition board is arranged at the outlet of the first channel, and at least one middle partition board is arranged between the first partition board and the second partition board and arranged at intervals along the outer wall of the inner shell; the leading-in port of the first clapboard is the inlet of the third channel, and the leading-out port of the second clapboard is the outlet of the third channel. The ratio of the inlet port to the first partition plate is regarded as the aperture ratio, and the larger the aperture ratio of the partition plate, the larger the bandwidth of the first-stage noise cancellation band, but the smaller the amount of noise cancellation, and when the aperture ratio is 100%, the noise cancellation effect is lost.
The ventilation metamaterial unit cell structure provided by the embodiment of the application is a sub-wavelength hollow structure, an inner shell of the ventilation metamaterial unit cell structure is provided with a first channel, and a third channel is arranged between the inner shell and an outer shell of the ventilation metamaterial unit cell structure. The utility model provides a ventilation metamaterial unit cell structure has the advantage of ventilation, printing opacity and noise suppression concurrently, and its simple structure, volume are light and handy, easily concatenation equipment can be applied to in indoor, building wall and the industry sound proof cover structure.
In a possible realization mode, the first partition plate, the at least one middle partition plate and the second partition plate are sequentially connected to form the spiral partition plate.
FIGS. 1-2 illustrate a ventilated metamaterial unit cell structure. Referring to fig. 1 and 2, the ventilation metamaterial unit cell structure is a sub-wavelength hollow structure, and includes an outer shell, an inner shell, and a sound insulation module, where the outer shell and the inner shell are both hollow cylindrical structures with openings at two ends, the outer shell defines a first channel, the inner shell is disposed in the first channel of the outer shell and is concentric with the outer shell, the inner shell defines a second channel, a center line of the second channel is overlapped with a center line of the first channel, the sound insulation module includes a spiral partition plate, a section of the spiral partition plate near an inlet of the first channel is regarded as the first partition plate, a section of the spiral partition plate near an outlet of the first channel is regarded as the second partition plate, and a middle portion of the spiral partition plate is regarded as a middle partition plate, and the first partition plate and the second partition plate do not completely shield a cross-sectional area between the outer shell and the inner shell, so that sound waves can pass through the spiral partition plate.
In the manufacturing process, the spiral clapboard and the inner shell can be integrally formed and then glued in the outer shell. The cross-sectional shape of the inner shell may be circular and the cross-sectional shape of the outer shell may be rectangular (as shown in fig. 1) or hexagonal (as shown in fig. 3).
FIG. 3 shows the Comsol simulation result of the ventilated metamaterial unit cell structure under the condition that the thickness of the spiral partition board is 52mm, the sound wave is conducted along the spiral path defined by the spiral partition board, the monopole mode and the dipole mode excited by the system form effective reflection, and the transmission loss amplitude in the 800-1250Hz frequency range reaches above 15 dB.
In this embodiment, the thickness and pitch of the spiral partition plate are adjustable, and the thickness and pitch of the partition plate can be specifically designed according to the noise spectrum characteristics, so as to suppress the sound in a specific frequency band. Fig. 4 shows the Comsol simulation results of the ventilation metamaterial unit cell structure under the condition that the spiral partition plates have the same thickness and the screw pitches are 12.5mm, 8.33mm and 4.25mm respectively, and the results show that the smaller the screw pitch is, the lower the noise elimination frequency is under the condition that the thickness of the spiral partition plates is constant. Furthermore, the ventilation metamaterial unit cell structures with different pitches are combined to form a broadband sound insulation panel.
In one possible implementation mode, the first partition plate, the second partition plate and the middle partition plate are respectively provided with at least one through hole, the through holes of the first partition plate and the second partition plate are respectively staggered with the through holes of the adjacent middle partition plates, and the through holes of the two adjacent middle partition plates are staggered with each other; the through hole of the first clapboard is an inlet, and the through hole of the second clapboard is an outlet.
FIGS. 6-7 show a ventilation metamaterial unit cell structure, which is a sub-wavelength hollow structure and comprises an outer shell, an inner shell and a sound insulation module, wherein the outer shell and the inner shell are hollow columnar structures with two open ends, the outer shell defines a first channel, the inner shell is arranged in the first channel of the outer shell and is concentric with the outer shell, the inner shell defines a second channel, the center line of the second channel is coincident with the center line of the first channel, the sound insulation module comprises a first partition board close to the inlet of the first channel, a second partition board close to the outlet of the first channel and a middle partition board between the first partition board and the second partition board, the first partition board, the middle partition board and the second partition board are arrayed along the axial direction of the inner shell, through holes are arranged on the first partition board, the second partition board and the middle partition board, and the through holes on the first partition board, the second partition board and the middle partition board are distributed differently, the positions of the through holes of the middle partition plate, the first partition plate and the second partition plate are staggered, and the diameter of the through holes, the perforation rate of the partition plates, the position distribution of the through holes and the thickness of the partition plates are adjustable. The shape of the through hole can be round, triangular, rectangular, oval and the like.
FIG. 8 shows Comsol simulation results of the ventilated metamaterial unit cell structure shown in FIG. 6, showing: the ventilation metamaterial unit cell structure achieves 10dB of noise elimination within the frequency range of 1600 plus 2300 Hz.
Fig. 9 shows Comsol simulation results of the ventilation metamaterial unit cell structure for the case of circular via diameters of 3mm, 4mm, 5mm, respectively, and the results show: the larger the diameter of the circular hole and the larger the number of holes, the higher the sound attenuation frequency shifts to a high frequency. The larger the number of intermediate partitions, the wider the sound attenuation frequency range, but the sound attenuation amount is reduced.
In one possible implementation mode, the first partition plate, the second partition plate and the middle partition plate are provided with notches, the notches of the first partition plate and the second partition plate are staggered with the notches of the adjacent middle partition plates, and the notches of the two adjacent middle partition plates are staggered with each other; the gap of the first clapboard is an inlet, and the gap of the second clapboard is an outlet.
FIGS. 10-12 show a ventilation metamaterial unit cell structure, which is a sub-wavelength hollow structure and includes an outer shell, an inner shell, and a sound insulation module, where the outer shell and the inner shell are both hollow cylindrical structures with openings at both ends, the outer shell defines a first channel, the inner shell is disposed in the first channel of the outer shell and is concentric with the outer shell, the inner shell defines a second channel, a center line of the second channel coincides with a center line of the first channel, the sound insulation module includes a first partition board close to an inlet of the first channel, a second partition board close to an outlet of the first channel, and a middle partition board disposed between the first partition board and the second partition board, the first partition board, the middle partition board, and the second partition board are arrayed along an axial direction of the inner shell, notches are disposed on the first partition board, the second partition board, and the middle partition board, and the notches are distributed differently, the positions of the gaps of the middle partition plate, the first partition plate and the second partition plate are staggered, and the shape and the size of the gap, the opening rate of the partition plate and the thickness of the partition plate are adjustable. The notches may be dovetail-shaped, and as shown in fig. 11, the dovetail-shaped openings of the middle partition and the dovetail-shaped openings of the partitions at both sides are staggered by 180 degrees. The opening angle of the dovetail-shaped opening is adjustable, the opening angle of the dovetail-shaped opening shown in fig. 12 is 120 degrees, and the dovetail opening angle can be adjusted according to the requirement of noise elimination
FIG. 13 shows Comsol simulation results for the ventilated metamaterial unit cell structure shown in FIG. 10, showing: the noise elimination amount of the ventilation metamaterial unit cell structure in the 1450-3100Hz frequency range reaches 7 dB.
Fig. 14 shows Comsol simulation results of the ventilated metamaterial unit cell structure for the cases where the dovetail opening angles are 90 °, 120 ° and 160 °, respectively, and the results show: between the inner shell and the outer shell, the larger the opening area of the dovetail-shaped partition plate is, the higher the noise elimination frequency shifts to high frequency, and the noise elimination effect is lost when the opening is completely opened; the larger the number of intermediate partitions, the wider the sound attenuation frequency range, but the sound attenuation amount is reduced.
The embodiment of the utility model also provides a ventilation sound barrier applying the ventilation metamaterial unit cell structure, the ventilation sound barrier comprises a plurality of ventilation metamaterial unit cell structures, the ventilation metamaterial unit cell structures are spliced to form a sound insulation panel, and the noise elimination frequencies of the ventilation metamaterial unit cell structures can be the same or different.
The shells of the ventilation metamaterial unit cell structures can be spliced with each other or connected with each other through connecting pieces. As shown in fig. 15, when the outer shell is a rectangular structure, the outer walls of the adjacent ventilation metamaterial unit cell structures are in contact with each other, so that seamless splicing can be realized, and a sound insulation panel is formed. As shown in fig. 16, when the outer shell is of a hexagonal structure, the outer walls of adjacent units of ventilation metamaterial structures are attached to each other to form a honeycomb structure. Of course, a connecting piece attached to the unit cell structure of the ventilation metamaterial can be designed, and adjacent unit cell structures of the ventilation metamaterial are connected through the connecting piece to form the sound insulation panel.
Referring to fig. 17, the ventilation and sound barrier may further include a movable frame, and the sound insulation panel is disposed in the frame. The structure enables the ventilation sound barrier to move conveniently, and further increases the application range.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (8)
1. A ventilation metamaterial unit cell structure, characterized in that the ventilation metamaterial unit cell structure is a sub-wavelength hollow structure, comprising:
a housing defining a first channel;
an inner shell disposed within the first channel, the inner shell defining a second channel having a centerline coincident with the centerline of the first channel, an inlet aligned with the inlet of the first channel, and an outlet aligned with the outlet of the first channel;
the sound insulation module is connected with the inner wall of the outer shell and the outer wall of the inner shell, a third channel is formed between the outer shell and the inner shell, the inlet of the third channel is close to the inlet of the first channel, the outlet of the third channel is close to the outlet of the first channel, and the sound transmission path of the third channel is longer than that of the second channel;
the sound insulation module comprises a first partition plate, a second partition plate and at least one middle partition plate, wherein the first partition plate is provided with an inlet, and the second partition plate is provided with an outlet; the first partition plate is arranged at the inlet of the first channel, the second partition plate is arranged at the outlet of the first channel, and the at least one middle partition plate is positioned between the first partition plate and the second partition plate and arranged at intervals along the outer wall of the inner shell;
the leading-in port of the first clapboard is the inlet of the third channel, and the leading-out port of the second clapboard is the outlet of the third channel; the first partition plate, the second partition plate and the middle partition plates are provided with notches, the notches of the first partition plate and the second partition plate are staggered with the notches of the adjacent middle partition plates, and the notches of the two adjacent middle partition plates are staggered with each other; alternatively, the first and second electrodes may be,
the first partition plate, the second partition plate and the middle partition plates are all provided with at least one through hole, the through holes of the first partition plate and the second partition plate are mutually staggered with the through holes of the adjacent middle partition plates, and the through holes of the two adjacent middle partition plates are mutually staggered.
2. The unit cell structure of claim 1, wherein the notch of the first partition is the inlet and the notch of the second partition is the outlet.
3. The ventilation metamaterial unit cell structure as claimed in claim 1, wherein the through holes of the first partition plate are the inlet ports, and the through holes of the second partition plate are the outlet ports.
4. The ventilation metamaterial unit cell structure of claim 1, wherein the inner shell is concentric with the outer shell.
5. The ventilation metamaterial unit cell structure of any one of claims 1-4, wherein the inner shell is circular, square, pentagonal, hexagonal, octagonal, fan-shaped, or heart-shaped in shape; the shape of the shell is square, pentagonal, hexagonal, octagonal, fan-shaped, circular or heart-shaped.
6. A ventilation sound barrier applying the ventilation metamaterial unit cell structure as claimed in any one of claims 1 to 5, which comprises a plurality of ventilation metamaterial unit cell structures, wherein the ventilation metamaterial unit cell structures are spliced to form a sound insulation panel, and the sound attenuation frequencies of the ventilation metamaterial unit cell structures are the same or different.
7. The ventilation sound barrier of claim 6, wherein a plurality of said ventilation metamaterial unit cell structure enclosures are spliced or connected to each other by connectors.
8. The ventilation sound barrier of claim 6, further comprising a movable frame, wherein said acoustical isolation panel is disposed within said frame.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115748528A (en) * | 2022-11-23 | 2023-03-07 | 兰州交通大学 | Rail transit sound barrier based on four composite partition plate primitive cells |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115748528A (en) * | 2022-11-23 | 2023-03-07 | 兰州交通大学 | Rail transit sound barrier based on four composite partition plate primitive cells |
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