CN110473510B - Cell structure based on phonon crystal and return air sound insulation device - Google Patents

Cell structure based on phonon crystal and return air sound insulation device Download PDF

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CN110473510B
CN110473510B CN201910704391.8A CN201910704391A CN110473510B CN 110473510 B CN110473510 B CN 110473510B CN 201910704391 A CN201910704391 A CN 201910704391A CN 110473510 B CN110473510 B CN 110473510B
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cavity
panel
square
cavity flow
hole
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CN110473510A (en
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张若军
王桂波
周萧明
张思维
王添
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Beijing Institute of Technology BIT
714th Research Institute of CSIC
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Beijing Institute of Technology BIT
714th Research Institute of CSIC
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The embodiment of the invention discloses a cell structure based on phononic crystal and a return air sound insulation device, wherein the cell structure comprises: the core layer is arranged between the first panel and the second panel, and the first panel, the core layer and the second panel are overlapped; holes are respectively formed in two opposite sides of the first panel and two opposite sides of the second panel; the open pore space is offered respectively to the opposite both sides of sandwich layer, except open pore space, and the other space of sandwich layer is provided with at least one first baffle of parallel arrangement, and first baffle cuts apart the other space of sandwich layer into two at least cavity runners of parallel arrangement, and the second baffle passes every first baffle, cuts apart every cavity runner into first cavity runner and second cavity runner, and open pore space is just to the coincidence with the hole, and first cavity runner and second cavity runner link to each other with the hole respectively. The cell structure of the embodiment of the invention is based on the elastic wave forbidden band characteristic of phonon crystals, so that the cell structure has a return air function and a good sound insulation effect.

Description

Cell structure based on phonon crystal and return air sound insulation device
Technical Field
The embodiment of the invention relates to the field of ventilation and sound insulation, in particular to a cell structure based on phonon crystals and a return air sound insulation device.
Background
With the development of industry and science, ships and aerospace devices have also been rapidly developed. And the ventilation equipment and other mechanical equipment can be accompanied by noise during use. The return air sound insulation device in the prior art has poor sound insulation effect.
Aiming at the problems of the return air sound insulation device in the prior art, the return air sound insulation device needs to be improved so as to improve the sound insulation effect of the return air sound insulation device.
Disclosure of Invention
The embodiment of the invention provides a cell structure based on phononic crystals and a return air sound insulation device so as to improve the sound insulation effect of the return air sound insulation device.
In a first aspect, an embodiment of the present invention provides a photonic crystal-based cell structure, including: the first panel, the core layer, the second panel, the first separator and the second separator; the core layer is arranged between the first panel and the second panel, and the first panel, the core layer and the second panel are overlapped;
holes are respectively formed in two opposite sides of the first panel and two opposite sides of the second panel;
Open pore space is offered respectively to the opposite both sides of sandwich layer, except open pore space, the other spaces of sandwich layer are provided with at least one of parallel arrangement first baffle, first baffle will the other spaces of sandwich layer are cut apart into two at least cavity runners of parallel arrangement, the second baffle passes every first baffle links to each other, will every cavity runner is cut apart into first cavity runner and second cavity runner, open pore space territory the hole is just right to coincide, first cavity runner with second cavity runner respectively in the hole links to each other.
Further, the pores are single pores or the pores are porous consisting of at least two sub-pores.
Further, the shape of the sub-holes is round or square, and the square comprises a right-angle square or a round corner square; the areas of different sub-holes are equal or unequal.
Further, the shape of the hole is square, and the square comprises a right-angle square or a round-angle square.
Further, the second partition board is a square partition board or a trigonometric function curve partition board.
Further, the cross-sectional shapes of the first cavity flow channel and the second cavity flow channel are round, triangular or square.
Further, the length of the longest cavity flow channel in each of the first cavity flow channel and each of the second cavity flow channels is calculated by the following formula:
Wherein c represents the propagation velocity of sound in air; f represents a preset frequency; l 1 denotes the length of the longest cavity flow channel of each of the first cavity flow channel and each of the second cavity flow channels.
Further, the shape of the hole is a right-angle square; the ventilation area of the phononic crystal based cellular structure is calculated by the following formula:
ω＝(N-1)Δt1+NΔd；
a＝w+2Δt2；
b＝L1+ΔL；
S＝ηab；
Wherein Δt 1 represents a preset thickness of the first separator, N represents the number of the cavity flow channels, Δd represents a preset width of the cavity flow channels, w represents a length of the hole, and Δt 2 represents a preset wall thickness of the cell structure; l 1 denotes the length of the longest cavity flow channel in each of the first cavity flow channel and each of the second cavity flow channels, and DeltaL denotes a preset length threshold of the cavity flow channel; a represents the length of the cellular structure; b represents the width of the cellular structure; η represents a preset ventilation rate; s represents the ventilation area of the phononic crystal based cellular structure.
Further, the hole is a single hole, and the shape of the hole is a right-angle square; the f=557.5 Hz, the n=10, the Δt=1 mm, the Δd=13.8 mm, the Δt 2 =1 mm, the Δl=12 mm, and the η=0.44.
In a second aspect, an embodiment of the present invention further provides a phononic crystal-based return air sound insulation device, where the phononic crystal-based return air sound insulation device includes a phononic crystal-based cell structure according to the first aspect of the present invention, where the number of cell structures is at least one;
The cell structure periodically forms a phonon crystal plate-shaped structure, and the phonon crystal plate-shaped structure is a single-layer phonon crystal plate-shaped structure or a multi-layer phonon crystal plate-shaped structure.
According to the invention, a cell structure based on phonon crystals is designed, wherein the cell structure comprises a first panel, a core layer, a second panel, a first partition plate and a second partition plate, the core layer is arranged between the first panel and the second panel, the first panel, the core layer and the second panel are overlapped, holes are respectively formed in two opposite sides of the first panel and two opposite sides of the second panel, open hole spaces are respectively formed in two opposite sides of the core layer, at least one first partition plate is arranged in the rest space of the core layer except the open hole spaces, the first partition plate divides the rest space of the core layer into at least two cavity runners which are arranged in parallel, the second partition plate penetrates through each first partition plate to divide each cavity runner into a first cavity runner and a second cavity runner, the open hole spaces are opposite to the holes and are overlapped, and the first cavity runner and the second cavity runner are respectively connected with the holes. Through the second baffle penetrating each first baffle, each cavity runner is divided into a first cavity runner and a second cavity runner, so that the cavity runners have a return air function, and meanwhile, the air flow noise can be restrained in a wide frequency range based on the elastic wave forbidden band characteristic of the phonon crystal. The air return device has the advantages of achieving an air return function and simultaneously achieving a good sound insulation effect.
Drawings
FIG. 1 is a schematic diagram of a phononic crystal-based cellular structure according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a core layer according to an embodiment of the present invention;
FIG. 3 is a schematic top view of another core layer according to an embodiment of the present invention;
FIG. 4 is a schematic top view of a photonic crystal-based cellular structure according to an embodiment of the present invention;
FIG. 5 is a schematic top view of another photonic crystal-based cellular structure in accordance with embodiments of the present invention;
FIG. 6 is a schematic top view of a photonic crystal-based cellular structure according to an embodiment of the present invention;
FIG. 7 is a schematic top view of a photonic crystal-based cellular structure in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of another phononic crystal-based cellular structure in an embodiment of the present invention;
FIG. 9 is a schematic top view of a cell structure based on phononic crystal according to an embodiment of the present invention;
FIG. 10 is a schematic top view of a further core layer according to an embodiment of the present invention;
FIG. 11 is a schematic structural view of a phononic crystal-based return air sound insulation device in accordance with an embodiment of the present invention;
FIG. 12 is a side view of a photonic crystal slab structure in an embodiment of the present invention;
fig. 13 is a schematic view of an application of a return air sound insulation device in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It will be appreciated that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention, as various features described in the embodiments may be combined to form multiple alternatives. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Phonon crystals are composite materials with a phonon band gap composed of two or more materials in a periodically arranged form. When the frequency of the elastic wave is in the band gap frequency range, the elastic wave cannot pass through the material, so that the effects of vibration isolation and noise reduction can be achieved. By elastic band gap is understood that an elastic wave in a particular frequency range is prevented from propagating. I.e. the elastic band gap is understood to be the elastic band gap. The phonon crystal has a characteristic that when the frequency of the elastic wave falls within the forbidden band, the elastic wave is prohibited from propagating. Elastic wave forbidden band formation mechanisms include localized resonance mechanisms and bragg scattering mechanisms. The local resonance mechanism is considered that under the excitation of elastic waves with specific frequencies, a single scatterer resonates and interacts with the incident waves so that the waves cannot continue to propagate. In this case, the generation of the elastic wave forbidden band mainly depends on the interaction of the elastic wave with the structure of each single scatterer itself. Based on the above, for phonons conforming to the local resonance mechanism, the elastic wave forbidden band is closely related to the inherent vibration characteristics of a single scatterer, and has little relation with the periodicity and lattice constant of the scatterer, which provides a basis for the application of phonon crystals in a low-frequency band.
Based on the above, a cell structure based on the phonon crystal can be designed based on the elastic wave forbidden band characteristic of the phonon crystal so as to improve the sound insulation effect of the return air sound insulation device. The cellular structure is understood to be, among other things, the scatterer shown above. The following will explain by specific examples.
Fig. 1 is a schematic structural diagram of a cellular structure based on phononic crystal according to an embodiment of the present invention, where the embodiment may be suitable for improving the sound insulation effect of a return air sound insulation device. The upper diagram in fig. 1 is a schematic diagram of the overall structure of a phononic crystal-based cellular structure. The lower diagram in fig. 1 is a schematic diagram of each part of the cellular structure based on phononic crystal. As shown in fig. 1, the phononic crystal-based cellular structure 1 may specifically include a first panel 10, a core layer 11, a second panel 12, a first separator 13, and a second separator 14, the structure and function of which are described below.
The core 11 may be disposed between the first panel 10 and the second panel 12 with the first panel 10, the core 11, and the second panel 12 overlapping.
The opposite sides of the first panel 10 and the opposite sides of the second panel 12 may be provided with holes 15, respectively.
Open pore spaces 16 can be respectively formed on two opposite sides of the core layer 11, at least one first partition plate 13 which is arranged in parallel can be arranged in the rest space of the core layer 11 except the open pore spaces 16, the first partition plate 13 can divide the rest space of the core layer 11 into at least two cavity flow passages 17 which are arranged in parallel, the second partition plate 14 passes through each first partition plate 13 to be connected, each cavity flow passage 17 can be divided into a first cavity flow passage 170 and a second cavity flow passage 171, the open pore spaces 16 can be aligned with the holes 15, and the first cavity flow passages 170 and the second cavity flow passages 171 can be connected with the holes 15 respectively.
In an embodiment of the present invention, as shown in fig. 1, a first panel 10, a core layer 11, a second panel 12, a first separator 13, and a second separator 14 may constitute a cellular structure 1. Wherein the core layer 11 may be disposed between the first panel 10 and the second panel 12, and the first panel 10, the core layer 11, and the second panel 12 are overlapped, that is, the first panel 10, the core layer 11, and the second panel 12 are identical in size and are overlapped in center when forming the cellular structure 1. The cell structure 1 may be square in shape.
A set of opposite sides of the first panel 10 may be provided with holes 15, i.e. the first panel 10 may be provided with two holes 15, the two holes 15 being located on opposite sides of the first panel 10, respectively. Likewise, a set of opposite sides of the second panel 12 may be provided with holes 15, i.e. the second panel 12 may be provided with two holes 15, the two holes 15 being located on opposite sides of the second panel 12, respectively. The size of each hole 15 may be the same or different, and may be specifically designed according to the actual situation, and is not specifically limited herein. It will be appreciated that if the dimensions of each aperture 15 are the same, then as the dimensions of the first and second panels 10, 12 are the same, when the first and second panels 10, 12 are placed in registry, the apertures 15 at the corresponding locations will also be in registry. It should be noted that, as can be seen from fig. 1, the first panel 10 and the second panel 12 further include another set of opposite sides, and the opposite sides of the set are not provided with holes 15. It should be noted that the shape of the hole 15 may be square, and the square may be rectangular or rounded square. The pores 15 may be single pores or may be porous consisting of at least two sub-pores.
The open spaces 16 may be formed on a set of opposite sides of the core layer 11, i.e., the core layer 11 may be formed with two open spaces 16, and the two open spaces 16 are located on opposite sides of the core layer 11. The dimensions of each open space 16 may be the same or different, and may be specifically designed according to the actual situation, and are not particularly limited herein. The open space 16 may be aligned with the aperture 15 as follows: since the core layer 11 is disposed between the first panel 10 and the second panel 12, two holes 15 are formed in the first panel 10 and the second panel 12, in order to realize air return and sound insulation, two open spaces 16 of the core layer 11 are required to be disposed opposite to the two holes 15 on the first panel 10 and the two holes 15 on the second panel 12, respectively, and the size of each open space 16 is consistent with the size of the hole 15 at the corresponding position. It should be noted that, as can be seen from fig. 1, the core layer 11 further includes another set of opposite sides, and the open spaces 16 are not formed on the opposite sides of the set.
As shown in fig. 1, on the core layer 11, the remaining space of the core layer 11 may be provided with first spacers 13 arranged in parallel, except for two open spaces 16, and the number of the first spacers 13 may be at least one. Accordingly, the at least one first partition 13 may divide the remaining space of the core 11 into at least two cavity flow channels 17. The above can be understood as: the cavity flow channel 17 is formed between the two adjacent first partition plates 13 except the first partition plates 13 closest to the two sides of the core layer 11. The cavity flow channel 17 is formed between the first partition 13 closest to the two sides of the core layer 11 and the side edge of the core layer 11. It is understood that if the number of the first partitions 13 arranged in parallel is N, the number of the cavity flow passages 17 is (n+1). And the cavity flow channels 17 are also parallel to each other. The first separators 13 may be arranged in parallel at equal intervals or may be arranged in parallel at unequal intervals, and may be specifically set according to the actual situation, and are not particularly limited herein. Accordingly, the cavity flow passages 17 may be arranged in parallel at intervals, may be arranged in parallel at unequal intervals, may be specifically set according to the actual situation, and are not particularly limited herein. The number of the first separator 13 may be set according to the actual situation, and is not particularly limited here.
The second partition 14 may pass through each first partition 13 to divide each cavity flow passage 17 into two parts, i.e., a first cavity flow passage 170 and a second cavity flow passage 171. The cavity flow path lengths of the first cavity flow path 170 and the second cavity flow path 171 corresponding to each cavity flow path 17 may be the same or different, and may be specifically set according to actual situations, and are not specifically limited herein. As shown in fig. 2, a schematic top view of the core layer is provided. Only a portion of the core layer 11 is shown in fig. 2. The second partition 14 passes through the first partition 13 to divide the cavity flow passage 17 into two parts, i.e., a first cavity flow passage 170 and a second cavity flow passage 171. Based on the above, the core layer 11 may be composed of the frame, the first separator 13, and the second separator 14. Wherein the border is understood as the side of the core layer.
It will be appreciated that if the distances from the second separator 14 to the opposite sides of the open space 16 formed in the core layer 11 are the same, the cavity flow lengths of the first cavity flow channel 170 and the second cavity flow channel 171 corresponding to each cavity flow channel 17 are the same. If the distances between the second separator 14 and the opposite sides of the open space 16 formed in the core layer 11 are different, the lengths of the cavity flow channels of the first cavity flow channel 170 and the second cavity flow channel 171 are different for each cavity flow channel 17. As shown in fig. 1, since the second separator 14 is spaced apart from two opposite open spaces 16 formed in the core layer 11, the cavity flow path lengths of the first cavity flow path 170 and the second cavity flow path 171 are different for each cavity flow path 17. It will also be appreciated that since the second separator 14 passes through each first separator 13 to divide each cavity flow passage 17 into two, it can be said that both ends of the second separator 14 intersect with the opposite sides of the core 11 where the open-cell space 16 is not provided. It should be noted that the second separator 14 may divide the core layer 11 into two parts for the core layer 11. If one of the two parts is fixed and the other part is rotated 180 ° clockwise along the second partition 14, the two parts may or may not overlap after rotation, and the two parts may be specifically set according to the actual situation and are not specifically limited herein. The second separator 14 may be a square separator or a triangular separator, and may be specifically set according to practical situations, and is not specifically limited herein. The second separator 14 in fig. 1 is a square separator.
By way of example, as shown in fig. 3, a schematic top view of another core layer is provided. The core layer in fig. 3 is the core layer in fig. 1. The second separator 14 in fig. 3 and 1 is spaced apart from the core 11 by different distances from opposite sides of the open space 16. In fig. 3, two ends of the second separator 14 are shown to intersect with two opposite sides of the core 11, where the open space 16 is not provided, respectively, to obtain two intersecting lines. As shown in fig. 3, the opposite sides of the core layer 11 where the open space 16 is not formed may be referred to herein as a first side and a third side, respectively, and the opposite sides of the core layer 11 where the open space 16 is formed may be referred to herein as a second side and a fourth side, respectively. For an intersection line on the second side, each point on the intersection line is at a distance L 1 from the first side and at a distance L 2 from the third side. For the intersection line on the fourth side, each point on the intersection line is also at a distance L 1 from the third side and a distance L 2 from the third side. Wherein L 1＞L2. As described above, since the second separator 14 in fig. 2 is also shaped like fig. 1, and L 1＞L2, the cavity flow path lengths of the first cavity flow path 170 and the second cavity flow path 171 corresponding thereto are different for each cavity flow path 17. And, the second separator 14 divides the core layer 11 into two parts, and if one of the two parts is fixed and the other part is rotated 180 ° clockwise along the second separator 14, the two parts will overlap after rotation. The two portions are trapezoidal in shape from a top view.
The second partition 14 divides each of the cavity flow passages 17 into two independent portions, i.e., a first cavity flow passage 170 and a second cavity flow passage 171, and the first cavity flow passage 170 and the second cavity flow passage 171 are partitioned by the second partition 14. When the first panel 10, the core layer 11, the second panel 12, the first separator 13 and the second separator 14 are arranged in the above arrangement, the two open-pore spaces 16 are aligned with the corresponding holes 15, and form a space with the corresponding cavity flow channels 17. Air can flow in the space formed by the hole 15, the open-pore space 16 corresponding thereto, and the air flow passage 17 corresponding thereto. When air flows in the first cavity flow passage 170, the air is blocked by the second partition 14 and the direction of the air is reversed. Similarly, when air flows in the second flow passage 171, the air is blocked by the second partition 14 and the direction of the air is reversed. The above can be understood that the cellular structure 1 can realize the air return function.
The elastic wave forbidden band characteristic based on the phonon crystal designs a cell structure based on the phonon crystal, and can inhibit air flow noise in a wide frequency range, so that the elastic wave forbidden band has a return air function and a good sound insulation effect.
According to the technical scheme, through designing a cell structure based on phonon crystals, the cell structure comprises a first panel, a core layer, a second panel, a first partition plate and a second partition plate, wherein the core layer is arranged between the first panel and the second panel, the first panel, the core layer and the second panel are overlapped, holes are respectively formed in two opposite sides of the first panel and two opposite sides of the second panel, open hole spaces are respectively formed in two opposite sides of the core layer, at least one first partition plate which is arranged in parallel is arranged in other spaces of the core layer except the open hole spaces, the other spaces of the core layer are divided into at least two cavity runners which are arranged in parallel by the first partition plate, each cavity runner is divided into a first cavity runner and a second cavity runner by the second partition plate, the open hole spaces are opposite to the holes and are overlapped, and the first cavity runner and the second cavity runner are respectively connected with the holes. Through the second baffle penetrating each first baffle, each cavity runner is divided into a first cavity runner and a second cavity runner, so that the cavity runners have a return air function, and meanwhile, the air flow noise can be restrained in a wide frequency range based on the elastic wave forbidden band characteristic of the phonon crystal. The air return device has the advantages of achieving an air return function and simultaneously achieving a good sound insulation effect.
Alternatively, as shown in fig. 4, the hole 15 may be a single hole or the hole 15 may be a multi-hole composed of at least two sub-holes, based on the above-described technical solution.
In an embodiment of the present invention, as shown in fig. 4, a schematic top view of a cell structure based on phononic crystal is provided. Fig. 4 shows a first drawing, a second drawing, a third drawing and a fourth drawing from top to bottom, respectively. The first drawing of the pores 15 is a single pore and the second, third and fourth drawing of the pores 15 is a porous structure consisting of at least two sub-pores. In the first drawing, the hole 15 is a single hole, and a single hole is understood to be one hole. The holes 15 in the second, third and fourth figures are all porous, i.e. it is understood that the holes 15 are divided into at least two sub-holes. The shape of the aperture 15 in fig. 4 is rectangular square. In the second drawing, each sub-aperture is circular in shape. In the third figure, each sub-hole is in the shape of a rounded square. The shape of the sub-holes in the fourth figure is rectangular. If the hole 15 is a porous hole composed of at least two sub-holes, the interval between the sub-holes may be set according to the actual situation, and is not particularly limited herein. The areas of the different sub-holes may be equal or different, or may be specifically set according to the actual situation, and are not specifically limited herein. The shapes of the different sub-holes may be the same or different, or may be specifically set according to actual conditions, and are not particularly limited herein.
Alternatively, as shown in fig. 4, on the basis of the above technical solution, the shape of the sub-holes may be circular or square, and the square may include a square with right angles or a square with rounded corners. The areas of different sub-holes are equal or unequal.
In an embodiment of the invention, if the hole 15 is divided into at least two sub-holes, the shape of the sub-holes may be circular or square, wherein the square may comprise a square with right angles or a square with rounded corners. The four corners of the square are right angles, and the adjacent two sides of the square are connected by an arc. As can be seen from the above, the shape of the sub-holes in the second drawing is circular, the shape of the sub-holes in the third drawing and the fourth drawing is square, wherein the shape of the sub-holes in the third drawing is rounded square, and the shape of the sub-holes in the fourth drawing is rounded square.
The areas of the different sub-holes may be equal or unequal, and may be specifically set according to actual situations, which is not specifically limited herein. The shape of the different sub-holes may be the same or different, or may be specifically set according to the actual situation, and is not particularly limited herein.
It should be noted that, if the hole 15 is a porous hole composed of at least two sub-holes, it is possible that the sum of the areas of the sub-holes is not equal to the area of the hole 15. The above-mentioned unequal cases may be that the shape of the sub-holes is circular or rounded square, or that the shape of the sub-holes is rectangular square, but the interval between adjacent sub-holes is not zero. This will result in the holes 15 being single holes and the corresponding areas being unequal when the holes 15 are multi-holes. More specifically, this will result in the aperture 15 being porous with a smaller corresponding area than if the aperture 15 were single-hole. In the case of a defined ventilation rate, the ventilation area and/or the total area can be adjusted to achieve the defined ventilation rate, since the ventilation rate is the ratio of the ventilation area to the total area. The ventilation area of the phononic crystal based cellular structure 1 in the embodiment of the invention is the sum of the areas of the two holes 15.
For achieving the determined ventilation rate by adjusting the ventilation area, in particular: in the case where the shape of the holes 15 is square and the ventilation rate, the total area and the length of the holes 15 are determined, the holes 15 are single holes, and the holes 15 are porous composed of at least two sub-holes and the sum of the areas of the respective sub-holes is different from the area of the holes 15, the corresponding widths of the holes 15 are different. And the width of the corresponding hole 15 when the hole 15 is a single hole is smaller than the width of the corresponding hole 15 when the hole 15 is a multiple hole. By way of example, as shown in fig. 5, a schematic top view of another phononic crystal-based cell structure is provided. The shape of the hole 15 shown in fig. 5 is a square, and e may represent the width of the hole 15. The hole 15 shown in the upper diagram in fig. 5 is a single hole. The lower diagram in fig. 5 shows that the holes 15 are porous consisting of at least two sub-holes, the shape of which is circular. Based on the above, the width e of the hole 15 in which the upper drawing in fig. 5 shows the hole 15 as a single hole is smaller than the width e of the hole 15 in which the lower drawing in fig. 5 shows the hole 15 as a multiple hole.
For achieving the determined ventilation rate by adjusting the total area, the following is specific: in the case where the shape of the hole 15 is square and the ventilation rate, the ventilation area, and the length of the hole 15 are determined, the hole 15 is a single hole, the hole 15 is a multi-hole composed of at least two sub-holes and the sum of the areas of the sub-holes is different from the area of the hole 15, and the area corresponding to the case where the hole 15 is a single hole is larger than the area corresponding to the case where the hole 15 is a multi-hole. In this case, the total area corresponding to the case where the holes 15 are porous can be reduced. Exemplary, as shown in fig. 6, a schematic top view of a cell structure based on phononic crystals is provided. The shape of the holes 15 shown in fig. 6 is rectangular, e may represent the width of the holes 15, b may represent the width of the cellular structure 1. The hole 15 shown in the upper diagram in fig. 6 is a single hole. The lower diagram in fig. 6 shows that the holes 15 are porous consisting of at least two sub-holes, the shape of which is circular. Based on the above, the width e of the hole 15 in the upper diagram of fig. 6, which is the single hole, is equal to the width e of the hole 15 in the lower diagram of fig. 6, which is the multi-hole 15, and the width b of the cell structure 1 in the upper diagram of fig. 6, which is the single hole, is larger than the width b of the cell structure 1 in the lower diagram of fig. 6, which is the multi-hole 15.
Alternatively, as shown in fig. 7, the shape of the hole 15 may be square, and the square may include a right-angle square or a rounded square, based on the above technical solution.
In an embodiment of the present invention, as shown in fig. 7, a schematic top view of a cell structure based on phonon crystals is provided. The shape of the aperture 15 may be square, which may include square or rounded square. The shape of the holes 15 shown in the upper drawing in fig. 7 is rectangular square, and the shape of the holes 15 shown in the lower drawing in fig. 7 is rounded square. The shape of the hole 15 may be set according to the actual situation, and is not particularly limited herein.
Alternatively, based on the above technical solution, the second separator 14 may be a square separator or a trigonometric function curved separator.
In an embodiment of the present invention, the second separator 14 may be a square separator or a trigonometric function curved separator. The trigonometric function curve may include a sine curve, a tangent curve, a cotangent curve, and the like. As shown in fig. 1 and 3, the second separator 14 is a square separator.
Alternatively, the cross-sectional shapes of the first cavity flow channel 170 and the second cavity flow channel 171 may be circular, triangular or square based on the above-described embodiments.
In the embodiment of the present invention, the cross-sectional shape of the cavity flow channel 17 may be circular, triangular or square, that is, the cross-sectional shapes of the first cavity flow channel 170 and the second cavity flow channel 171 may be circular, triangular or square, and may be specifically set according to practical situations, and is not specifically limited herein. As shown in fig. 1 to 3, the first cavity flow channel 170 and the second cavity flow channel 171 have square cross-sectional shapes.
Alternatively, based on the above technical solution, the length of the longest cavity flow channel in each of the first cavity flow channels 170 and each of the second cavity flow channels 171 may be calculated by the following formula: wherein c may represent the propagation velocity of sound in air; f may represent a preset frequency; l 1 may represent the length of the longest cavity flow channel of each of the first cavity flow channels 170 and each of the second cavity flow channels 171.
In the embodiment of the present invention, the length of the longest cavity flow path among the respective first cavity flow paths 170 and the respective second cavity flow paths 171, that is, the length of the longest cavity flow path, may be calculated by the following formulaWhere c may represent the propagation velocity of sound in air, i.e. c=340 m/s; f may represent a preset frequency. The preset frequency f may be set according to actual situations, and is not particularly limited herein.
For example, if the preset frequency f=557.5 Hz, then L 1 =152.5 mm. As shown in fig. 3, the longest cavity flow path of the first and second cavity flow paths 170 and 171 has a length L 1.
Alternatively, on the basis of the above technical solution, the shape of the hole 15 may be rectangular. The ventilation area of the phononic crystal based cellular structure 1 can be calculated by the following formula: ω= (N-1) Δt 1+NΔd;a＝w+2Δt2;b＝L1 +Δl; s=ηab. Wherein Δt 1 may represent a preset thickness of the first separator 13, N may represent the number of the cavity flow channels 17, Δd may represent a preset width of the cavity flow channels 17, w may represent a length of the hole 15, and Δt 2 may represent a preset wall thickness of the cell structure 1; l 1 may represent the length of the longest cavity flow channel of each first cavity flow channel 170 and each second cavity flow channel 171, and Δl may represent a preset length threshold of the cavity flow channel 17; a may represent the length of the cellular structure 1; b may represent the width of the cellular structure 1; η may represent a preset ventilation rate; s may represent the ventilation area of the phononic crystal based cellular structure 1.
In the embodiment of the present invention, the shape of the hole 15 is a square. As shown in fig. 8, another structural schematic diagram of a phononic crystal-based cell structure is given. As shown in fig. 9, a schematic top view of a cell structure based on phononic crystal is provided. As shown in fig. 10, a schematic top view of yet another core layer is provided. Wherein the length a of the cell structure 1 and the width b of the cell structure 1 can be seen in fig. 8. The length a of the cell structure 1, the width b of the cell structure 1, the preset wall thickness Δt 2 of the cell structure 1, the length ω of the hole 15, and the width e of the hole 15 can be seen in fig. 9 and 10. The preset width d of the cavity flow channel 17, the preset thickness Δt 1 of the first partition 13, the length L 1 of the longest cavity flow channel among the respective first cavity flow channels 170 and the respective second cavity flow channels 171, and the preset length threshold Δl of the cavity flow channel 17 can be seen in fig. 10.
It should be noted that the number N of the cavity flow channels 17, the preset width Δd of the cavity flow channels 17, the preset thickness Δt 1 of the first partition 13, the preset wall thickness Δt 2 of the cell structure 1, the preset length threshold Δl of the cavity flow channels 17, and the preset ventilation rate η may be preset. As can be seen from the above, the length of the longest cavity flow channel among the second cavity flow channels 171The preset frequency f may be preset.
The determination process of each parameter is as follows: according to the formulaThe preset frequency f may be preset. According to this formula, the length L 1 of the longest one of each of the first cavity flow path 170 and each of the second cavity flow paths 171 can be determined.
The width b of the cell structure 1 can be determined according to a preset length threshold Δl of the preset cavity flow channel 17 and the formula b=l 1 +Δl.
The length ω of the hole 15 can be determined according to the preset number N of the cavity flow channels 17, the preset width Δd of the cavity flow channels 17, and the preset thickness Δt 1 of the first separator 13, and the formula ω= (N-1) Δt 1 +nΔd.
The length a of the cell structure 1 can be determined according to the determined length ω of the hole 15 and the preset wall thickness Δt 2 of the preset cell structure 1, and the formula a=w+2Δt 2.
According to the determined length a of the cell structure 1, the width b of the cell structure 1 and the preset ventilation rate eta, and the formula, s=etab, the ventilation area S of the cell structure 1 based on phonon crystals can be determined.
It will be appreciated that the ventilation area s=ηab=2ωe, where e may represent the width of the aperture 15. As can be seen from the above, the width e of the holes 15 may be different depending on the situation of the holes 15. See in particular the above description for the realization of the determined ventilation rate section by adjusting the ventilation area.
It should be noted that, since the cellular structure 1 is composed of the first panel 10, the core layer 11, the second panel 12, the first separator 13 and the second separator 14, wherein the first separator 13 and the second separator 14 are located inside the core layer 11, the core layer 11 is disposed between the first panel 10 and the second panel 12, and the first panel 10, the core layer 11 and the second panel 12 are aligned and overlapped, the length a of the cellular structure 1 is the lengths of the first panel 10, the core layer 11 and the second panel 12, and the width b of the cellular structure 1 is the widths of the first panel 10, the core layer 11 and the second panel 12.
Alternatively, on the basis of the above technical solution, the hole 15 is a single hole, and the shape of the hole 15 may be a square. The width of the aperture 15 can be calculated by the following formula: ω= (N-1) Δt 1+NΔd;a＝w+2Δt2;b＝L1 +Δl; Wherein Δt 1 may represent a preset thickness of the first separator 13, N may represent the number of the cavity flow channels 17, Δd may represent a preset width of the cavity flow channels 17, w may represent a length of the hole 15, and Δt 2 may represent a preset wall thickness of the cell structure 1; l 1 may represent the length of the longest cavity flow channel of each first cavity flow channel 170 and each second cavity flow channel 171, and Δl may represent a preset length threshold of the cavity flow channel 17; a may represent the length of the cellular structure 1; b may represent the width of the cellular structure 1; η may represent a preset ventilation rate; e may represent the width of the aperture 15.
In the embodiment of the present invention, it should be noted that the number N of the cavity flow channels 17, the preset width Δd of the cavity flow channels 17, the preset thickness Δt 1 of the first partition 13, the preset wall thickness Δt 2 of the cell structure 1, the preset length threshold Δl of the cavity flow channels 17, and the preset ventilation rate η may be preset. As can be seen from the above, the length of the longest cavity flow channel among the second cavity flow channels 171The preset frequency f may be preset.
In the case where the hole 15 may be a single hole and the shape of the hole 15 may be a square, the above-described respective parameters are determined as follows: according to the formulaThe preset frequency f may be preset. According to this formula, the length L 1 of the longest one of each of the first cavity flow path 170 and each of the second cavity flow paths 171 can be determined.
The width b of the cell structure 1 can be determined according to a preset length threshold Δl of the preset cavity flow channel 17 and the formula b=l 1 +Δl.
The length ω of the hole 15 can be determined according to the preset number N of the cavity flow channels 17, the preset width Δd of the cavity flow channels 17, and the preset thickness Δt 1 of the first separator 13, and the formula ω= (N-1) Δt 1 +nΔd.
The length a of the cell structure 1 can be determined according to the determined length ω of the hole 15 and the preset wall thickness Δt 2 of the preset cell structure 1, and the formula a=w+2Δt 2.
Based on the determined length a of the cell structure 1, the width b of the cell structure 1, the length ω of the aperture 15 and the predetermined ventilation rate η, and the formula,The width e of the hole 15 can be determined.
Alternatively, on the basis of the above technical solution, the hole 15 may be a single hole, and the shape of the hole 15 may be a square. f=557.5 hz, n=10, Δt 1＝1mm,Δd＝13.8mm,Δt2 =1 mm, Δl=12 mm, η=0.44.
In the embodiment of the present invention, the preset frequency f=557.5 Hz, the number n=10 of the first partition plates 13, the preset thickness Δt 1 =1 mm of the first partition plates 13, the preset width Δd=13.8 mm of the cavity flow channel 17, the preset wall thickness Δt 2 =1 mm of the cell structure 1, the preset length threshold Δl=12 mm of the cavity flow channel 17, and the ventilation rate η=0.44 may be preset.
Based on the above, in the case that the hole 15 may be a single hole and the shape of the hole 15 may be a square, the width b=164.5 mm of the cell structure 1 may be calculated according to the formula, and the length a=149 mm of the cell structure 1; the length ω=147 mm of the aperture 15 and the width e=37 mm of the aperture 15.
Optionally, on the basis of the above technical solution, the thickness of the core layer 11 is greater than or equal to 10mm.
In an embodiment of the present invention, h 0 in fig. 8 may represent the thickness of the core layer 11, as shown in fig. 8. It is necessary to ensure that the thickness of the core layer 11 is greater than or equal to 10mm. For example, the thickness h 0 of the core layer 11=18 mm.
Alternatively, on the basis of the above technical solution, the thickness of the first panel 10 and the second panel 12 is 1mm.
In the embodiment of the present invention, the thicknesses of the first panel 10 and the second panel 12 may be the same or different, and may be specifically set according to the actual situation, which is not particularly limited herein. As shown in fig. 8, h 1 in fig. 8 may represent the thickness of the first panel 10, and h 2 may represent the thickness of the second panel 12. The thickness h 1 of the first panel 10 may be set equal to the thickness h 2 of the second panel 12, and h 1＝h2 =1 mm.
Fig. 11 is a schematic structural diagram of a return air sound insulation device based on phononic crystal according to an embodiment of the present invention, where the embodiment may be suitable for improving the sound insulation effect of the return air sound insulation device. The left diagram in fig. 11 is a schematic top view of a phononic crystal-based return air sound insulation device. The right side view of fig. 11 is a schematic diagram of the side view structure of the return air sound insulation device based on phononic crystal. As shown in fig. 11, the phononic crystal-based return air sound insulation device may specifically include the phononic crystal-based cell structure 1 according to the embodiment of the present invention. The structure and function thereof will be described below.
The number of cell structures 1 may be at least one.
The cell structure 1 periodically forms a phonon crystal plate-shaped structure, and the phonon crystal plate-shaped structure is a single-layer phonon crystal plate-shaped structure or a multi-layer phonon crystal plate-shaped structure.
In the embodiment of the present invention, the number of the cell structures 1 may be at least one, and the number of the cell structures 1 may be adjusted according to the size of the air return opening. The cell structures 1 may be periodically arranged to form a phononic crystal plate-like structure. It should be noted that, if the number of cell structures 1 is at least two, the distance between two adjacent cell structures 1 may be set according to the actual situation, which is not particularly limited herein. The distance may be any value equal to or greater than 0. It should be noted that, if the number of cell structures 1 is at least three, the distance between every two adjacent cell structures 1 may be the same or different, or may be specifically set according to the actual situation, and the method is not specifically limited herein, that is, the cell structures 1 may be arranged at equal intervals or may be arranged at unequal intervals, or may be specifically set according to the time situation, and is not specifically limited herein.
As shown in the left diagram of fig. 11, three cell structures 1 are arranged periodically in the X-axis direction, and two cell structures 1 are arranged periodically in the Y-axis direction, which forms a 3×2 phonon crystal plate-like structure. Wherein, along the X-axis direction, each cell structure 1 is arranged at equal intervals; along the Y-axis, the cell structures 1 are also arranged at equal intervals. Setting the distance between two adjacent cell structures 1 along the X-axis direction as xi x; along the Y-axis, the distance between two adjacent cell structures 1 is ζ y. As shown in the left hand view of fig. 11, ζ x≠ξy.
The phonon crystal plate-like structure may be a single-layer phonon crystal plate-like structure or a multi-layer phonon crystal plate-like structure, and is specifically set according to the actual situation, and is not particularly limited herein. Illustratively, as shown in FIG. 12, a side view of a phononic crystal plate-like structure is provided. M may represent the number of layers of the phononic crystal plate-like structure. The left diagram in fig. 12 is a single-layer phonon crystal plate-like structure, i.e., m=1. The right diagram in fig. 12 is a four-layer photonic crystal plate-like structure, i.e., m=4.
Illustratively, if the phononic crystal plate-like structure is a single-layer phononic crystal plate-like structure, the length of the longest cavity flow channel in each of the first cavity flow channel 170 and each of the second cavity flow channels 171L 1 =152.5 mm; the width b=164.5 mm of each cell structure 1, and the length a=149 mm of the cell structure 1; the length ω=147 mm of the hole 15, and the width e=37 mm of the hole 15; the thickness h 0 of the core layer 11 = 18mm; the thickness h 1 of the first panel 10 is equal to the thickness h 2 of the second panel 12, and h 1＝h2 =1 mm. As shown in fig. 13, a schematic diagram of the result of using a return air sound insulation device is provided. As can be seen from fig. 13, compared with the conventional return air sound insulation device, the average sound insulation amount of the return air sound insulation device based on the phonon crystal provided by the embodiment of the invention is improved by at least 3dB, and the length of the cavity channel corresponding to the cavity channel 17 at the preset frequency f=557.5 Hz is the length of the longest cavity channel among the first cavity channel 170 and the second cavity channel 171, that is, the length of the cavity channel corresponding to the cavity channel 17 at the preset frequency f=557.5 Hz is L 1 =152.5 mm.
According to the technical scheme, through the cell structure based on the phonon crystal, the air return function is achieved, and meanwhile, the sound insulation effect is good.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.

Claims (10)

1. A phononic crystal-based cellular structure, comprising: the first panel, the core layer, the second panel, the first separator and the second separator; the core layer is arranged between the first panel and the second panel, and the first panel, the core layer and the second panel are overlapped;
holes are respectively formed in two opposite sides of the first panel and two opposite sides of the second panel;
Open pore space is offered respectively to the opposite both sides of sandwich layer, except open pore space, the other space of sandwich layer is provided with at least one of parallel arrangement first baffle, first baffle will the other space of sandwich layer is cut apart into two at least cavity runners of parallel arrangement, the second baffle passes every first baffle, will every cavity runner is cut apart into mutually independent first cavity runner and second cavity runner, open pore space with the hole is just to the coincidence, first cavity runner with second cavity runner respectively with the hole links to each other for the air is in first cavity runner or the in-process that flows in the second cavity runner is blocked by the second baffle and the wind direction is reverse, realizes the return air.
2. The phononic crystal based cellular structure of claim 1, wherein the pores are single pores or the pores are multi-pores consisting of at least two sub-pores.
3. The phononic crystal based cellular structure of claim 2, wherein the shape of the sub-aperture is circular or square, the square including square with right angles or square with rounded corners; the areas of different sub-holes are equal or unequal.
4. A photonic crystal-based cellular structure according to any of claims 1-3, wherein said holes are square in shape, said square comprising a square with right angles or a square with rounded corners.
5. A phononic crystal based cellular structure according to any one of claims 1-3, wherein the second separator is a square separator or a trigonometric curve separator.
6. A photonic crystal-based cellular structure according to any of claims 1-3, wherein the cross-sectional shape of said first cavity flow channel and said second cavity flow channel is circular, triangular or square.
7. The photonic crystal-based cellular structure of claim 4, wherein the length of the longest cavity channel in each of the first cavity channel and each of the second cavity channel is calculated by the formula:
Wherein c represents the propagation velocity of sound in air; f represents a preset frequency; l 1 denotes the length of the longest cavity flow channel of each of the first cavity flow channel and each of the second cavity flow channels.
8. The photonic crystal-based cellular structure of claim 7, wherein the shape of the hole is rectangular; the ventilation area of the phononic crystal based cellular structure is calculated by the following formula:
ω＝(N-1)Δt1+NΔd；
a＝w+2Δt2；
b＝L1+ΔL；
S＝ηab；
Wherein Δt 1 represents a preset thickness of the first separator, N represents the number of the cavity flow channels, Δd represents a preset width of the cavity flow channels, w represents a length of the hole, and Δt 2 represents a preset wall thickness of the cell structure; l 1 denotes the length of the longest cavity flow channel in each of the first cavity flow channel and each of the second cavity flow channels, and DeltaL denotes a preset length threshold of the cavity flow channel; a represents the length of the cellular structure; b represents the width of the cellular structure; η represents a preset ventilation rate; s represents the ventilation area of the phononic crystal based cellular structure.
9. The phononic crystal based cellular structure of claim 8, wherein the pores are single pores; the f=557.5 Hz, the n=10, the Δt 1 =1 mm, the Δd=13.8 mm, the Δt 2 =1 mm, the Δl=12 mm, and the η=0.44.
10. A phononic crystal based return air sound insulation device comprising a phononic crystal based cell structure according to any one of claims 1 to 9, wherein the number of cell structures is at least one;
The cell structure periodically forms a phonon crystal plate-shaped structure, and the phonon crystal plate-shaped structure is a single-layer phonon crystal plate-shaped structure or a multi-layer phonon crystal plate-shaped structure.
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