CN114855660A - Phononic crystal sound absorber, sound barrier and using and mounting method - Google Patents
Phononic crystal sound absorber, sound barrier and using and mounting method Download PDFInfo
- Publication number
- CN114855660A CN114855660A CN202210618925.7A CN202210618925A CN114855660A CN 114855660 A CN114855660 A CN 114855660A CN 202210618925 A CN202210618925 A CN 202210618925A CN 114855660 A CN114855660 A CN 114855660A
- Authority
- CN
- China
- Prior art keywords
- sound
- absorber
- micro
- regular hexagon
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 207
- 230000004888 barrier function Effects 0.000 title claims abstract description 98
- 239000013078 crystal Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 91
- 238000005192 partition Methods 0.000 claims abstract description 40
- 230000000737 periodic effect Effects 0.000 claims abstract description 16
- 239000004038 photonic crystal Substances 0.000 claims abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 16
- 239000011358 absorbing material Substances 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 10
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 239000010432 diamond Substances 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 claims description 5
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 claims description 4
- 239000006098 acoustic absorber Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 20
- 238000009413 insulation Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 13
- 230000002238 attenuated effect Effects 0.000 abstract description 3
- 238000009423 ventilation Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0017—Plate-like elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0023—Details, e.g. foundations
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
- E01F8/0064—Perforated plate or mesh, e.g. as wall facing
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
- E01F8/0076—Cellular, e.g. as wall facing
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a photonic crystal sound absorber which comprises a hollow cylinder, wherein the interior of the hollow cylinder is divided into a plurality of chambers by partition plates, part of side walls of the hollow cylinder are micro-perforated side walls facing a sound source, and part of the partition plates are micro-perforated partition plates, so that the hollow cylinder is in a structure with a plurality of sound absorption cavities. Based on the sound absorber, the invention also discloses a sound barrier. The sound barrier combines the micro-perforated wall/plate, the resonance sound absorption cavity, the periodic structure and a plurality of sound absorption measures distributed in a gradient manner layer by layer, the sound waves can be reflected and multiply scattered to the sound barrier, when the frequency of the sound waves falls within the band gap range of the periodic structure, the sound insulation effect of the sound barrier is optimal, and the purposes of sound absorption and noise reduction are achieved; the sound-absorbing and noise-reducing device can block direct sound waves, isolate transmitted sound waves and enable diffracted sound waves to be sufficiently attenuated, thereby playing the roles of sound absorption and noise reduction, avoiding the conditions of overhigh sound barrier and poor ventilation and lighting, and achieving the purpose of load reduction.
Description
Technical Field
The invention relates to a noise reduction technology for road or railway traffic, in particular to a phononic crystal sound absorber, a sound barrier and a using and installing method.
Background
Along with the development of modern economic society, the construction of roads and railways in China is increasingly perfect, the rapid development of traffic transportation accelerates the modernization process of China, but a series of problems are caused at the same time, and the influence of the noise of train operation on the environments on two sides of the roads becomes one of four public harms of social environment. Noise control in transportation is becoming more important, and especially for high-speed railways crossing urban areas, highways around urban areas and the like, noise has an important influence on the life of residents around roads and the development of scientific research or experiments.
The sound barrier is widely applied as an effective way for disposing noise pollution in traffic transportation. The sound insulation principle of the sound barrier is that a barrier is inserted between a sound source and a sound receiving point to block direct sound waves, isolate transmitted sound waves and sufficiently attenuate diffracted sound waves, so that the sound absorption and noise reduction effects are achieved, and the principle is shown in fig. 1.
The sound barrier may be classified into a vertical sound barrier, an arc sound barrier, a top-angled sound barrier, a closed sound barrier, etc. according to the shape, as shown in fig. 2. The sound barrier is classified into a concrete sound barrier, a metal sound barrier, and the like according to the difference of the sound barrier materials. The noise reduction principle is classified into a reflection type sound barrier, a resonance type sound barrier, a sound absorption type sound barrier, a hybrid type sound barrier, and the like. The design principle of these sound barriers is to increase the reflection capability of sound waves by increasing the height of the top of the sound barrier and the bending angle, thereby increasing the sound insulation and noise reduction performance of the sound barrier.
For example, chinese patent publication No. CN 208266720U discloses a sound-insulating and-absorbing combined screen for roads, which includes: pile foundation, pile foundation top layer steel sheet, stand bottom plate, stand, load crossbeam, sound barrier panel, connecting bolt and sound absorber, the lower extreme of stand is fixed with the stand bottom plate, and pile foundation's upper end is fixed with pile foundation top layer steel sheet, is connected by connecting bolt between pile foundation top layer steel sheet and the stand bottom plate, is fixed with the load crossbeam between two adjacent stands, and the sound barrier panel is fixed between two adjacent stands, and the upper end of stand is for falling J-shaped, and the upper end of stand is equipped with the sound absorber. The highway sound insulation and absorption combined screen structure provided by the patent solves the problem that a highway sound insulation screen in the prior art cannot simultaneously achieve noise elimination, sound insulation and vibration reduction, achieves the coordination and simultaneous consideration of sound insulation and absorption and vibration reduction, and the average sound insulation quantity can reach 35 dB.
However, this type of sound barrier technology has two drawbacks: (1) the sound insulation performance is relatively poor, the noise with a specific frequency can be shielded, the low-frequency noise shielding effect is poor, the sound insulation performance of the sound barrier is gradually reduced along with the prolonging of the service life, and the application and maintenance difficulty of the sound barrier is increased. (2) For specific high-speed railways and highways, the sound barrier can be influenced by aerodynamic force brought by high-speed trains and external wind power, the lower part of the traditional sound barrier structure is poor in support performance, the air permeability of the barrier is poor, and under the effect of long-term wind load, the stability and the effective sound insulation performance of the structure are difficult to guarantee particularly in typhoon areas in the southeast coast of China.
The application of the phononic crystal technology in the field of sound barriers brings prospects for overcoming the defects. The phononic crystal is a composite periodic structure consisting of two or more media, and the periodic structure has a frequency dispersion characteristic and can prevent sound waves in a certain frequency range from being transmitted in the periodic structure. The invention provides a sound barrier solution based on the characteristics of phononic crystals.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a phononic crystal sound absorber, a sound barrier and a using and mounting method, which are used for solving the problems of poor sound insulation performance, unstable structure and the like of the sound barrier in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a phononic crystal acoustic absorber, includes the cavity cylinder, and cavity cylinder is inside to be separated into a plurality of cavities by the baffle, the part lateral wall of cavity cylinder is the microperforation lateral wall towards the sound source, part baffle is the microperforation baffle, makes the cavity cylinder be a plurality of sound-absorbing cavity structures.
Furthermore, the sound absorption material is filled in the partial cavity, and forms a helmholtz resonant cavity with other sound absorption cavities to form a composite structure of the sound absorption cavity and the helmholtz resonant cavity, so that sound waves enter the hollow cylinder and then continuously propagate and resonate in the sound absorption cavity and the helmholtz resonant cavity to achieve the purpose of energy consumption.
Furthermore, the sound absorber is a bidirectional sound absorber with two micro-perforated side walls, the sound absorbing material and the partition plate separate the interior of the hollow cylinder into two parts, and each part is provided with one micro-perforated side wall correspondingly.
Furthermore, the two-way sound absorber is of a honeycomb structure with a large regular hexagon frame as a cross section, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is positioned in the center of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame in the center, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frames and the sides of the large regular hexagon frame form a rhombic frame which is positioned in the large regular hexagon and comprises all corners;
the chamber to which the small regular hexagon frame belongs is a first sound absorption chamber, the chamber to which the diamond frame belongs is a second sound absorption chamber, two micro-perforated side walls of the bidirectional sound absorber are opposite to each other, the first sound absorption chamber and the second sound absorption chamber which are positioned on a symmetrical axis between the two micro-perforated side walls are filled with sound absorption materials, partition plates on two sides of the symmetrical axis and parallel to the micro-perforated side walls are micro-perforated partition plates, and the two partition plates of the second sound absorption chamber filled with the sound absorption materials are also micro-perforated partition plates.
Furthermore, the sound absorber is a one-way sound absorber with a micro-perforated side wall, the sound absorbing material separates the interior of the hollow cylinder into two parts, and only one part of the two parts corresponds to the micro-perforated side wall.
Furthermore, the one-way sound absorber is of a honeycomb structure with a cross section of a large regular hexagon frame, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is positioned at the center of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame at the center, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frames and the sides of the large regular hexagon frame form a rhombic frame positioned in the large regular hexagon and comprising all corners;
the chamber that little regular hexagon frame belongs to is first sound absorbing cavity, the chamber that rhombus frame belongs to is the second sound absorbing cavity, and the first sound absorbing cavity that is located the central part and two other first sound absorbing cavities that keep away from the micro-perforation lateral wall in both sides thereof all fill sound absorbing material, and the baffle that is parallel with the micro-perforation lateral wall is the micro-perforation baffle, and the baffle that is located the second sound absorbing cavity between sound absorbing material and the micro-perforation lateral wall also is the micro-perforation baffle.
The sound absorber of the scheme enables sound waves to continuously propagate and resonate in the sound absorbing cavity and the Helmholtz resonant cavity after entering the hollow cylinder, so that the purpose of energy consumption is achieved. The part of the sound absorption cavity is the sound absorption cavity and is also a part of the Helmholtz resonant cavity, and the sound energy is consumed by resonance while the sound energy is consumed by friction and the like in the propagation process, so that the sound waves can be completely consumed.
The invention also provides a sound barrier which comprises a plurality of layers of sound absorbers, wherein each layer of sound absorbers is gradually arranged far from a sound source layer by layer, the sound absorbers are horizontally arranged, the sound absorbers positioned on the first layer are provided with micro-perforated side walls on the sides facing the sound source and back to the sound source, the sound absorbers positioned on the last layer are provided with micro-perforated side walls only on the sides facing the sound source, the same interval is reserved between any two adjacent sound absorbers, and the sound absorber array is in lattice periodic arrangement.
The invention also provides another sound barrier which comprises a plurality of layers of sound absorbers, wherein each layer of sound absorbers is gradually distributed layer by layer relative to a sound source, the sound absorbers are vertically arranged, the height of each layer of sound absorbers is gradually increased layer by layer along the direction far away from the sound source, the sound absorbers positioned on the first layer are respectively provided with a micro-perforated side wall at one side facing the sound source and one side back to the sound source, the sound absorbers positioned on the last layer are only provided with a micro-perforated side wall at one side facing the sound source, the same interval is reserved between any two adjacent sound absorbers, and the sound absorber array is arranged in a lattice period.
The invention also provides another sound barrier which comprises an upper part and a lower part, wherein the upper part and the lower part are sound absorbers which are arranged in three layers, each layer of sound absorber is arranged layer by layer relative to a sound source, and the sound absorbers are hexagonal prisms;
in the lower part of the sound barrier, the sound absorbers are horizontally arranged, the sound absorber on the first layer is provided with micro-perforated side walls on one sides facing the sound source and the other side opposite to the sound source, the sound absorbers on the second layer and the third layer are provided with micro-perforated side walls only on one side facing the sound source, and the same interval is reserved between any two adjacent sound absorbers, so that the sound absorber array is arranged in a regular hexagon lattice period;
in the upper portion of sound barrier, the sound absorber erects the setting, and the direction successive layer that highly follows the far away from sound source of each layer sound absorber increases, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located second, three-layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is regular hexagon lattice period arrangement.
The sound barrier of this scheme has combined little perforation wall/board, resonance sound-absorbing cavity, periodic structure, the multiple sound absorption measure of successive layer gradient distribution, and the sound wave can take place reflection and multiple scattering to this sound barrier, and when the frequency of sound wave fell within the band gap scope of periodic structure, the sound insulation effect of sound barrier was the best, has realized inhaling the sound and has fallen the purpose of making an uproar. The sound-absorbing and noise-reducing device can block direct sound waves, isolate transmitted sound waves and enable diffracted sound waves to be sufficiently attenuated, thereby playing the roles of sound absorption and noise reduction, avoiding the conditions of overhigh sound barrier and poor ventilation and lighting, and achieving the purpose of load reduction.
Based on the sound barrier, the invention also provides a using and installing method of the sound barrier, which comprises the following steps:
step a, taking a noise source as a reference, determining the installation position of a sound barrier at the side of the noise source, and recording the vertical distance from the sound source to the sound barrier as L;
step b, vertically fixing the H-shaped combined steel plate 1 on a base plane by adopting foundation bolts 2, wherein the height of the H-shaped combined steel plate 1 is H 1 ；
C, mounting the sound absorbers from bottom to top and from back to front in sequence to ensure that the center distance between any two adjacent sound absorbers is a, embedding the end parts of the sound absorbers into the grooves of the H-shaped combined steel plate 1 and fixing the sound absorbers by bolts 10, wherein the height of the lower part of the sound barrier reaches H 1 Then the installation of the lower part is completed;
d, horizontally placing the top mounting flat plate 13 on the top end of the H-shaped combined steel plate 1, enabling one surface of the top mounting flat plate 13 with the five mounting grooves to face upwards, and fixing the edge part of the top mounting flat plate 13 on the H-shaped combined steel plate 1 by adopting angle steel 14 and fixing bolts 10;
e, sequentially installing the sound absorbers from back to front, ensuring that the horizontal center distance between any two adjacent sound absorbers is a, positioning the bottom end parts of the sound absorbers in the strip-shaped grooves and fixing the bottom end parts with the side walls of the strip-shaped grooves through the fixing bolts 10 and the nuts 12 to complete the installation of the upper parts of the sound barriers, wherein the height of the first layer of the sound absorbers is H 2 The height of the third layer of sound absorber is H 3 。
The mounting method can ensure the stability and the effective sound insulation performance of the sound barrier mounting structure, and has the advantages of convenience in mounting and easiness in dismounting.
Drawings
Fig. 1 is a schematic diagram illustrating a noise reduction principle of a prior art sound barrier.
Fig. 2 is a schematic view of the shape of various sound barriers of the prior art.
Fig. 3 is a schematic cross-sectional view of a specific embodiment of the bi-directional sound absorber of the present invention.
Fig. 4 is a schematic illustration of the propagation consumption within the sound absorber of the embodiment shown in fig. 3.
Fig. 5 is a schematic cross-sectional view of one embodiment of the unidirectional sound absorber of the present invention.
Fig. 6 is a perspective view of the one-way sound absorber shown in fig. 5.
Fig. 7 is a schematic longitudinal cross-sectional structure of one embodiment of a sound barrier of the present invention.
Fig. 8 is a schematic perspective view of a sound barrier according to an embodiment of the present invention.
Fig. 9 is a schematic view of a transverse cross-sectional structure of an upper portion of the sound barrier of fig. 7.
Fig. 10 is a schematic view showing the connection of a bidirectional sound absorber and an H-shaped composite steel plate according to an embodiment of the present invention.
FIG. 11 is a schematic view of the connection of the top mounting plate to the H-shaped composite steel plate according to an embodiment of the present invention.
FIG. 12 is a schematic view of a top mounting plate in accordance with an embodiment of the present invention.
Fig. 13 is a schematic structural view of an H-shaped composite steel plate according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
The main body of the phononic crystal sound absorber is a hollow cylinder, the shape of the sound absorber can be a cylinder, a triangular prism, a polygonal prism and the like, and even a special-shaped cylinder combining the prism and the cylinder. The shape of the absorber does not limit the internal multi-chamber structure, and the chambers are limited by the side wall of the main body and are separated by the partition plate. In addition, the scheme is characterized in that the side wall of the sound absorber faces the noise source, the micro-perforation is arranged on the sound source facing the side wall to form a micro-perforation side wall, and the micro-perforation is arranged on part of the partition plates to form micro-perforation partition plates, so that the hollow cylinder is in a structure with a plurality of sound absorption cavities.
The end face of an existing sound absorption cavity faces a noise source (the sound wave propagation direction is in the same direction with the axial direction of the sound absorption body), the micro-perforated holes are also formed in the end face, sound waves enter the sound absorption cavity from the micro-perforated holes and mainly consume energy by means of friction and mutual interference with the inner wall of the sound absorption cavity, the consumed energy cannot be thorough, and partial sound waves can still penetrate out of the other end to affect the noise reduction effect. According to the scheme, after the sound waves enter the sound absorption cavity from the micro-perforations of the side wall, due to the fact that the micro-perforations are also arranged on part of the partition plates, the sound waves can enter another sound absorption cavity from one sound absorption cavity, the sound absorption path is prolonged, the number of the micro-perforations which penetrate through the sound absorption path is increased, consumed energy is more, the sound absorption cavity reflects and interferes repeatedly, energy consumption of the sound waves is absorbed more thoroughly, and the noise reduction effect is improved to a great extent.
In order to improve the noise reduction effect, on the basis of the scheme, the sound absorption material is filled in part of the cavity, so that the sound wave energy is consumed to a greater extent and the transmission is blocked, the cavity filled with the sound absorption material becomes a real cavity which consumes the sound wave energy, and forms a Helmholtz resonant cavity with other sound absorption cavities to form a composite structure of the sound absorption cavity and the Helmholtz resonant cavity, so that the sound wave continuously transmits and resonates in the sound absorption cavity and the Helmholtz resonant cavity after entering the hollow cylinder to achieve the purpose of consuming the energy. The part of the sound absorption cavity is the sound absorption cavity and is also a part of the Helmholtz resonant cavity, and the sound energy is consumed by resonance while the sound energy is consumed by friction and the like in the propagation process, so that the sound waves can be completely consumed.
Based on the above design concept, two specific structural forms of the sound absorber are exemplified below for explaining the present solution in detail.
One of the sound absorbers is a bidirectional sound absorber with two micro-perforated side walls, the sound absorber and the partition plate separate the interior of the hollow cylinder into two parts, and each part is provided with one micro-perforated side wall correspondingly. For dealing with noise sources from two directions, the noise sources can be both original noise sources, such as two nearby running automobiles; or the noise source can be an original noise source and a derivative noise source with different original positions formed by reflection of the original noise source, such as a derivative noise source formed by the reflection of noise through a tunnel wall or other sound absorbers after a running automobile emits noise. The design concept conveyed by two microperforated sidewalls herein should not be limited to a specific number, but rather more than one microperforated sidewall to account for sound waves traveling in different directions. When the sound absorber is a hexagonal prism, an octagonal prism, etc., it is even possible to design three-sided microperforated sidewalls even more.
The hexagonal prism shaped sound absorber is taken as a specific embodiment, and the two-way sound absorber 18 is a honeycomb structure with a cross section of a large regular hexagon frame, as shown in fig. 3, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is located in the center of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame in the center, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frame and the sides of the large regular hexagon frame form a diamond frame located in the large regular hexagon and including each corner. Seen from the cross section pattern, the structure is that the big regular hexagon is divided into 7 small regular hexagons and 6 rhombuses, the sizes of the small regular hexagons are consistent, the small regular hexagons are all arranged in the same direction as the big regular hexagon, the 6 rhombuses are respectively positioned at the corners of the big regular hexagon, and the 7 small regular hexagons are adjacently connected in a cluster manner. The preferred multiplexing big regular hexagon frame in limit that little regular hexagon frame and big regular hexagon frame overlapped is favorable to simplifying the structure, and this kind of structure is regular, the manufacturing of being convenient for, and the structure is firm.
The chamber to which the small regular hexagon frame belongs is a first sound absorption chamber, the chamber to which the diamond frame belongs is a second sound absorption chamber, two micro-perforated side walls of the bidirectional sound absorber are opposite to each other, the first sound absorption chamber and the second sound absorption chamber which are positioned on a symmetrical axis between the two micro-perforated side walls are filled with sound absorption materials, partition plates on two sides of the symmetrical axis and parallel to the micro-perforated side walls are micro-perforated partition plates, and the two partition plates of the second sound absorption chamber filled with the sound absorption materials are also micro-perforated partition plates.
Referring to the cross-sectional pattern of fig. 3, the upper side wall 181 and the lower side wall 182 of the bidirectional sound absorber 18 are both micro-perforated side walls, the upper partition plates of the first sound absorption cavities 183-186 are all provided with micro-perforations, the lower partition plates of the first sound absorption cavities 183, 187, 188, 189 are all provided with micro-perforations, the upper partition plates and the lower partition plates of the second sound absorption cavities 191, 192, 194, 195 are all provided with micro-perforations, and the two partition plates of the second sound absorption cavities 190, 193 facing the first sound absorption cavity 183 are both provided with micro-perforations. In addition, the rest of the partition boards and the side walls are not provided with micro-perforations. The first sound absorption chamber 183 and the second sound absorption chambers 190 and 193 are filled with sound absorption materials. The upper and lower portions of the bi-directional sound absorber 18 are mirror images.
When sound waves enter from the lower side wall 182, the second sound absorbing chamber 195, the first sound absorbing chamber 189 and the second sound absorbing chamber 190 together form a helmholtz resonance chamber, except that the second sound absorbing chambers 194, 195 and the first sound absorbing chambers 187, 188, 189 serve as sound absorbing chambers. Similarly, the second sound-absorbing chamber 194, the first sound-absorbing chamber 187, and the second sound-absorbing chamber 193 together form another helmholtz resonator. First sound-absorbing chamber 188 and first sound-absorbing chamber 183 together form yet another helmholtz resonator. The sound waves propagate and resonate within the sound absorption cavity and the helmholtz resonator cavity and are eventually dissipated repeatedly. Because the upper part and the lower part of the bidirectional sound absorber 18 are mirror images, the upper part of the bidirectional sound absorber 18 has the same function. A bidirectional structure is provided to simultaneously receive noise sources or reflected sound waves in opposite directions except for the noise source facing direction.
Referring to fig. 4, the loss mode of the sound wave energy mainly includes four aspects of the transmission of the micro-perforated partition plate, the friction and reflection of the inner wall of the sound absorption cavity, the mutual interference of the sound waves and the loss of the sound absorption material. The sound wave passes through the micropunch baffle and gets into the sound absorber, can take place the transmission at the micropunch wall, causes the vibration of the inside air in hole to with the hole wall friction turn into partial acoustic energy heat energy consumption, the sound wave that gets into the sound absorber can be at the partial energy of the repeated reflection friction loss between the sound absorption cavity wall, can take place the interference effect between the reflection sound wave simultaneously and offset partial energy, final sound absorbing material consumes partial energy, and then consumes totally with acoustic energy.
The other sound absorber is a one-way sound absorber with a micro-perforated side wall, the sound absorbing material is used for blocking the interior of the hollow cylinder into two parts, and only one part of the sound absorbing material corresponds to the micro-perforated side wall and is used for responding to a noise source from one direction.
Also, a hexagonal prism-shaped sound absorber is taken as a specific example, referring to fig. 5 and 6, at this time, the unidirectional sound absorber 20 is a honeycomb structure with a cross section of a large regular hexagon frame, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is located in the central portion of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame in the central portion, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frame and the sides of the large regular hexagon frame form a diamond frame located in the large regular hexagon and including each corner.
The one-way absorber 20 is similar in construction to the two-way absorber 18, except for the side walls and partitions where the microperforations are located, and in which chambers the sound absorbing material is filled. Similarly, the chamber to which the small regular hexagon frame belongs is a first sound absorption chamber, the chamber to which the diamond frame belongs is a second sound absorption chamber, the first sound absorption chamber located in the center and the other two first sound absorption chambers, two sides of which are far away from the micro-perforated side wall, are both filled with sound absorption materials, the partition plate parallel to the micro-perforated side wall is a micro-perforated partition plate, and the partition plate of the second sound absorption chamber located between the sound absorption materials and the micro-perforated side wall is also a micro-perforated partition plate.
Referring to the cross-sectional pattern of fig. 5, the lower side wall 182 of the unidirectional sound absorber 20 is a micro-perforated side wall, the upper partition plates of the first sound-absorbing cavities 203, 204, 206, 207, 208, 209 are all provided with micro-perforations, the lower partition plates of all the first sound-absorbing cavities 203-209 and the second sound-absorbing cavities 211, 212, 214, 215 are all provided with micro-perforations, and the two partition plates of the second sound-absorbing cavities 210, 213 facing the first sound-absorbing cavity 203 are both provided with micro-perforations. In addition, the rest of the partition boards and the side walls are not provided with micro-perforations. The first sound-absorbing chambers 203, 204, 206 are filled with sound-absorbing material.
When sound waves enter from the lower side wall 202, the second sound-absorbing chamber 215, the first sound-absorbing chamber 209 and the second sound-absorbing chamber 210 form a helmholtz resonance chamber, except that the second sound-absorbing chambers 214, 215, 210 and 213 and the first sound-absorbing chambers 207, 208 and 209 are used as sound-absorbing chambers. Similarly, the second sound-absorbing chamber 214, the first sound-absorbing chamber 207, and the second sound-absorbing chamber 213 together form another helmholtz resonance chamber. The first sound-absorbing chamber 208 and the first sound-absorbing chamber 203 together constitute yet another helmholtz resonator. The sound waves propagate and resonate within the sound-absorbing chamber and the helmholtz resonator cavity and are eventually repeatedly consumed. The unidirectional sound absorber 20 is more used as a back-discharge sound absorber, so that when residual sound waves pass through the first sound absorbing cavities 203, 204 and 206, the reflection capability of the sound waves is enhanced due to the fact that the upper side wall 201 is not provided with micro-perforations, the sound waves can be prevented from being transmitted out of the unidirectional sound absorber 20, and the sound waves are reflected for multiple times in the cavities 211, 212 and 205 so as to achieve the purpose of depletion.
The sound absorber main part is preferably made of aluminum alloy materials, the micro-perforations are distributed according to a certain perforation rate, the size of the perforation rate can be preferably selected according to the noise level, and the shape of the micro-perforations is preferably selected by round holes and square holes. The sound absorption material can be made of porous sound absorption materials such as glass wool, rock wool, porous foam, felt and the like.
In addition, the sound absorption performance of the sound absorber is influenced by parameters such as the external size, the perforation rate, the aperture, the thickness of the perforated plate, the shape and the size of the cavity and the like of the sound absorber, theoretically, the size of the sound absorber is not too small or too large, and the resonance frequency, the sound absorption coefficient and the bandwidth of the sound absorber can be changed by adjusting the perforation rate and the plate thickness. The influence of the perforation rate and the depth of the cavity on the resonance frequency of the sound absorber is large, the resonance frequency of the sound absorber can be moved to low frequency by reducing the perforation rate and increasing the size of the cavity, and the sound absorption bandwidth of the sound absorption structure can be widened by properly increasing the perforation rate and the thickness of the cavity. Specifically, the parameter design of the sound absorber can be carried out according to the noise environment so as to obtain the optimal sound absorption effect.
Adopt above-mentioned sound absorber to construct the sound barrier, one of them sound barrier's prior scheme, including several layers of sound absorbers, each layer of sound absorber is arranged for the sound source successive layer is gradually far away, the sound absorber crouches and sets up, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located the end layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is lattice period arrangement. The periodic arrangement mode has certain dispersion characteristics, namely, scattering type attenuation domains are generated, sound waves in the attenuation domains cannot be transmitted through the periodic structure, and therefore the sound waves are reflected and absorbed between sound absorbers, and further consumption of the sound waves is promoted. By utilizing the characteristic, corresponding periodic structures can be designed for sound waves of different frequency bands.
When the sound absorber is used, two layers, three layers and even more layers are arranged according to field requirements, and the sound absorber is horizontal, so that when sound waves and air flow impact are resisted, the sound absorber is not easy to shake to influence the noise reduction effect, and a gap is reserved between the sound absorbers, so that the air flow can be timely discharged outwards, and the impact influence of the air flow on the sound barrier is avoided.
When the sound absorber erects the setting, also there is the priority scheme of a sound barrier this moment, and is the same including several layers of sound absorbers, each layer of sound absorber is arranged for the sound source successive layer is gradually far away, the height of each layer of sound absorber is along the direction successive layer isoperimetric gradient increase of keeping away from the sound source, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located the end layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is lattice period arrangement. The periodic arrangement mode has certain frequency dispersion characteristics, namely, a scattering type attenuation domain is generated, sound waves in the attenuation domain cannot be transmitted through the periodic structure, so that the sound waves are reflected and absorbed between sound absorbers, the sound waves are further consumed, and the propagation of the reflected sound waves and the diffracted sound waves is remarkably reduced.
When implementing, according to the on-the-spot needs, carry out two-layer, three-layer and even more multilayer arrange, owing to be gradient and to arranging far away, can prevent effectively that the sound wave from diffracting the sound barrier, also be favorable to the daylighting needs of the inboard driving of sound barrier, and have the interval space between the acoustic absorber, can in time outwards discharge the air current, be favorable to the air to flow, avoid the impact influence of air current to the sound barrier.
The two preferable sound barriers are combined to provide a specific sound barrier with a composite structure, as shown in fig. 7-9, the sound barrier comprises an upper portion and a lower portion, the upper portion and the lower portion are sound absorbers which are arranged in three layers, each layer of sound absorber is arranged layer by layer, the sound absorbers are in a hexagonal prism shape.
In the lower part of sound barrier, the sound absorber crouches and sets up, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located second, three-layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is regular hexagon lattice period arrangement.
In the upper portion of sound barrier, the sound absorber erects the setting, and the high gradient such as successive layer along the direction of keeping away from the sound source of each layer sound absorber increases, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located second, three-layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is regular hexagon lattice period arrangement.
The sound barrier with the composite structure combines various sound absorption measures of the micro-perforated wall/plate, the resonance sound absorption cavity, the periodic structure and the layer-by-layer gradient distribution, the sound waves can be reflected and multiply scattered to the sound barrier, when the frequency of the sound waves falls within the band gap range of the periodic structure, the sound insulation effect of the sound barrier is optimal, and the purposes of sound absorption and noise reduction are achieved. The sound-absorbing and noise-reducing device can block direct sound waves, isolate transmitted sound waves and enable diffracted sound waves to be sufficiently attenuated, thereby playing the roles of sound absorption and noise reduction, avoiding the conditions of overhigh sound barrier and poor ventilation and lighting, and achieving the purpose of load reduction. Three layers of sound absorbers are selected, so that the purpose of thorough noise reduction can be achieved, the sound absorbers are uniform and regular in shape, good in installation visual effect and small in construction difficulty due to the fact that the sound absorbers are arranged at equal intervals. The scheme does not limit that the first layer of sound absorber adopts the bidirectional sound absorber 18, and the back two layers adopt the unidirectional sound absorber 20, and when the number of layers is more, the arrangement of the bidirectional sound absorber 18 and the unidirectional sound absorber 20 is designed according to the site to form lattice period arrangement, and the purpose of thoroughly reducing noise is achieved.
The invention also provides a using and installing method of the sound barrier, and as shown in the combined drawings of 8-13, installing components such as section steel, bolts and the like are prepared, and the method comprises the following steps:
step a, taking a noise source as a reference, determining the installation position of a sound barrier at the side of the noise source, and recording the vertical distance from the sound source to the sound barrier as L;
step b, vertically fixing the H-shaped combined steel plate 1 on a base plane by adopting foundation bolts 2, wherein the height of the H-shaped combined steel plate 1 is H 1 ；
C, mounting the sound absorbers from bottom to top and from back to front in sequence to ensure that the center distance between any two adjacent sound absorbers is a, embedding the end parts of the sound absorbers into the grooves of the H-shaped combined steel plate 1 and fixing the sound absorbers by bolts 10, wherein the height of the lower part of the sound barrier reaches H 1 Then the installation of the lower part is completed;
d, horizontally placing the top mounting flat plate 13 on the top end of the H-shaped combined steel plate 1, enabling one surface of the top mounting flat plate 13 with the five mounting grooves to face upwards, and fixing the edge part of the top mounting flat plate 13 on the H-shaped combined steel plate 1 by adopting angle steel 14 and fixing bolts 10;
e, sequentially installing the sound absorbers from back to front, ensuring that the horizontal center distance between any two adjacent sound absorbers is a, positioning the bottom end parts of the sound absorbers in the strip-shaped grooves and fixing the bottom end parts with the side walls of the strip-shaped grooves through the fixing bolts 10 and the nuts 12 to complete the installation of the upper parts of the sound barriers, wherein the height of the first layer of the sound absorbers is H 2 The height of the third layer of sound absorber is H 3 ；
Wherein, L, H 1 、H 2 、H 3 And the value determination of a can refer to the railway sound barrier engineering design specification TB10505-2019 to stipulate that the sound insulation performance of the sound barrier is measured by adopting insertion value loss, wherein the insertion value loss is related to the length, the width, the height and the position of the sound barrier, and the installation position and the geometric parameters of the sound barrier are required to be designed according to a design target value and the specific situation of a site in the specific engineering application. The type of sound absorber material, the cross-sectional dimensions, a and H can be varied according to the prevailing frequency of the different noise environments 1 、H 2 、H 3 Thereby changing the theoretical forbidden band frequency range of the phononic crystal to achieve the optimal acoustic effect
The sound barrier unit is installed in the step, and the H-shaped combined steel plate 1 is shared between the two sound barrier units, so that the stability of the structure and the effective sound insulation performance are guaranteed. The sound barrier has the advantages of convenience in installation and easiness in disassembly.
The top installation flat plate 13 is a metal plate or a hard plastic plate, in order to fix the top sound absorber, six strip steel plates 15 are welded at equal intervals on the top installation flat plate 13 to form installation grooves, and the length of each strip steel plate 15 is the same as that of the top installation flat plate 13. It should be noted that, in order to facilitate the overlapping between the top mounting plates 13, the length of the top mounting plate 13 is equal to the distance between the central axes of the two H-shaped composite steel plates 1.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the embodiments are only used to help understanding the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the present description should not be construed as a limitation to the present invention.
Claims (10)
1. The utility model provides a phononic crystal acoustic absorber, includes the cavity cylinder, and cavity cylinder is inside to be separated into a plurality of cavities, its characterized in that by the baffle: part of the side wall of the hollow cylinder is a micro-perforated side wall facing the sound source, and part of the partition plates are micro-perforated partition plates, so that the hollow cylinder is of a plurality of sound absorption cavity structures.
2. A phononic crystal absorber as claimed in claim 1 wherein: the sound absorption material is filled in the partial cavity, and forms a Helmholtz resonant cavity with other sound absorption cavities to form a composite structure of the sound absorption cavity and the Helmholtz resonant cavity, so that sound waves enter the hollow cylinder and are continuously transmitted and resonated in the sound absorption cavity and the Helmholtz resonant cavity to achieve the purpose of energy consumption.
3. A phononic crystal absorber as claimed in claim 2 wherein: the sound absorber is a bidirectional sound absorber with two micro-perforated side walls, the sound absorbing material and the partition plate are used for blocking the interior of the hollow cylinder into two parts, and each part corresponds to one micro-perforated side wall.
4. A phononic crystal absorber as claimed in claim 3 wherein: the two-way sound absorber is of a honeycomb structure with a large regular hexagon frame as a cross section, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is positioned at the central part of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame at the central part, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frames and the sides of the large regular hexagon frame form a rhombic frame positioned in the large regular hexagon and comprising all corners;
the chamber to which the small regular hexagon frame belongs is a first sound absorption chamber, the chamber to which the diamond frame belongs is a second sound absorption chamber, two micro-perforated side walls of the bidirectional sound absorber are opposite to each other, the first sound absorption chamber and the second sound absorption chamber which are positioned on a symmetrical axis between the two micro-perforated side walls are filled with sound absorption materials, partition plates on two sides of the symmetrical axis and parallel to the micro-perforated side walls are micro-perforated partition plates, and the two partition plates of the second sound absorption chamber filled with the sound absorption materials are also micro-perforated partition plates.
5. A phononic crystal absorber as claimed in claim 2 wherein: the sound absorber is a one-way sound absorber with a micro-perforated side wall, the sound absorbing material separates the interior of the hollow cylinder into two parts, and only one part of the two parts corresponds to the micro-perforated side wall.
6. The phononic crystal absorber of claim 5 wherein: the one-way sound absorber is of a honeycomb structure with a large regular hexagon frame as a cross section, 7 connected small regular hexagon frames are embedded in the large regular hexagon frame, wherein 1 small regular hexagon frame is positioned at the central part of the cross section, the other 6 small regular hexagon frames are distributed around the small regular hexagon frame at the central part, one side of each small regular hexagon frame is correspondingly overlapped with one side of the large regular hexagon frame, and the sides of the small regular hexagon frames and the sides of the large regular hexagon frame form a rhombic frame positioned in the large regular hexagon and comprising all corners;
the chamber that little regular hexagon frame belongs to is first sound absorbing cavity, the chamber that rhombus frame belongs to is the second sound absorbing cavity, and the first sound absorbing cavity that is located the central part and two other first sound absorbing cavities that keep away from the micro-perforation lateral wall in both sides thereof all fill sound absorbing material, and the baffle that is parallel with the micro-perforation lateral wall is the micro-perforation baffle, and the baffle that is located the second sound absorbing cavity between sound absorbing material and the micro-perforation lateral wall also is the micro-perforation baffle.
7. The utility model provides a sound barrier, includes several layers of sound absorbers, each layer of sound absorber is for the sound source successive layer is gradually far arranged, its characterized in that: the sound absorber is the photonic crystal sound absorber as claimed in any one of claims 1 to 6, the sound absorber is arranged horizontally, the sound absorber on the first layer is provided with micro-perforated side walls on one side facing the sound source and one side back to the sound source, the sound absorber on the last layer is provided with micro-perforated side walls only on one side facing the sound source, the same interval is reserved between any two adjacent sound absorbers, and the sound absorber array is arranged in a lattice period.
8. The utility model provides a sound barrier, includes several layers of sound absorbers, each layer of sound absorber is for the sound source successive layer is gradually far arranged, its characterized in that: the sound absorber is the photonic crystal sound absorber of any one of claims 1-6, the sound absorber is vertically arranged, the height of each layer of sound absorber increases in an equal gradient manner layer by layer along the direction far away from the sound source, the sound absorber positioned on the first layer is provided with a micro-perforated side wall on one side facing the sound source and the side back to the sound source, the sound absorber positioned on the last layer is provided with a micro-perforated side wall on one side facing the sound source, the same interval is reserved between any two adjacent sound absorbers, and the sound absorber array is in lattice periodic arrangement.
9. A sound barrier comprising an upper portion and a lower portion, characterized in that: the upper part and the lower part are sound absorbers which are arranged in three layers, each layer of sound absorber is arranged layer by layer relative to a sound source, the sound absorbers are the phononic crystal sound absorbers according to any one of claims 1-6, and the sound absorbers are hexagonal prisms;
in the lower part of the sound barrier, the sound absorbers are horizontally arranged, the sound absorber on the first layer is provided with micro-perforated side walls on one sides facing the sound source and the other side opposite to the sound source, the sound absorbers on the second layer and the third layer are provided with micro-perforated side walls only on one side facing the sound source, and the same interval is reserved between any two adjacent sound absorbers, so that the sound absorber array is arranged in a regular hexagon lattice period;
in the upper portion of sound barrier, the sound absorber erects the setting, and the direction successive layer that highly follows the far away from sound source of each layer sound absorber increases, and the sound absorber that is located the first layer all has the micro-perforation lateral wall in the one side towards the sound source and the sound source dorsad, and the sound absorber that is located second, three-layer only has the micro-perforation lateral wall in the one side towards the sound source, all leaves the same interval between arbitrary two adjacent sound absorbers for the sound absorber array is regular hexagon lattice period arrangement.
10. A method for using and installing the sound barrier according to claim 9, wherein: the method comprises the following steps:
step a, taking a noise source as a reference, determining the installation position of a sound barrier at the side of the noise source, and recording the vertical distance from the sound source to the sound barrier as L;
step b, vertically fixing the H-shaped combined steel plate 1 on a base plane by adopting foundation bolts 2, wherein the height of the H-shaped combined steel plate 1 is H 1 ；
C, mounting the sound absorbers from bottom to top and from back to front in sequence to ensure that the center distance between any two adjacent sound absorbers is a, embedding the end parts of the sound absorbers into the grooves of the H-shaped combined steel plate 1 and fixing the sound absorbers by bolts 10, wherein the height of the lower part of the sound barrier reaches H 1 Then the installation of the lower part is completed;
d, horizontally placing the top mounting flat plate 13 on the top end of the H-shaped combined steel plate 1, enabling one surface of the top mounting flat plate 13 with the five mounting grooves to face upwards, and fixing the edge part of the top mounting flat plate 13 on the H-shaped combined steel plate 1 by adopting angle steel 14 and fixing bolts 10;
e, sequentially installing the sound absorbers from back to front, ensuring that the horizontal center distance between any two adjacent sound absorbers is a, positioning the bottom end parts of the sound absorbers in the strip-shaped grooves and fixing the bottom end parts with the side walls of the strip-shaped grooves through the fixing bolts 10 and the nuts 12 to complete the installation of the upper parts of the sound barriers, wherein the height of the first layer of the sound absorbers is H 2 The height of the third layer of sound absorber is H 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210618925.7A CN114855660A (en) | 2022-06-01 | 2022-06-01 | Phononic crystal sound absorber, sound barrier and using and mounting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210618925.7A CN114855660A (en) | 2022-06-01 | 2022-06-01 | Phononic crystal sound absorber, sound barrier and using and mounting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114855660A true CN114855660A (en) | 2022-08-05 |
Family
ID=82641108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210618925.7A Pending CN114855660A (en) | 2022-06-01 | 2022-06-01 | Phononic crystal sound absorber, sound barrier and using and mounting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114855660A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180626A (en) * | 2022-11-23 | 2023-05-30 | 兰州交通大学 | Rail transit sound barrier based on single hollow primitive cell |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2374940A2 (en) * | 2010-04-06 | 2011-10-12 | Akustik & Raum AG | Absorbent noise barriers |
| KR20150097088A (en) * | 2014-02-18 | 2015-08-26 | 주식회사 에스엠컴퍼니 | Vented two-way sound insulation board for noise barrier |
| CN107245963A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound barrier that phonon crystal is scattered based on Bragg |
| CN107245964A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound-absorbed barrier top structure that phonon crystal is scattered based on Bragg |
| CN209243600U (en) * | 2018-12-25 | 2019-08-13 | 大连明日环境发展有限公司 | A kind of sound absorption sound barrier |
| US20200005756A1 (en) * | 2018-07-02 | 2020-01-02 | Toyota Motor Engineering & Manufacturing North America, Inc. | Invisible sound barrier |
| WO2020098477A1 (en) * | 2018-11-15 | 2020-05-22 | 中车株洲电力机车有限公司 | Low-frequency coupling sound absorbing structure |
| CN112002300A (en) * | 2020-10-12 | 2020-11-27 | 株洲时代新材料科技股份有限公司 | Broadband resonance sound absorption method and structure |
| CN112227237A (en) * | 2020-11-10 | 2021-01-15 | 广州地铁设计研究院股份有限公司 | Sound barrier containing air resonant cavity |
| KR102223580B1 (en) * | 2020-10-21 | 2021-03-05 | 주식회사 자돌 | High functional complex noise reduction device |
| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
| CN113981848A (en) * | 2021-11-17 | 2022-01-28 | 山西省交通环境保护中心站（有限公司） | Highway honeycomb noise reduction screen |
| CN216074826U (en) * | 2021-10-20 | 2022-03-18 | 北京交通大学 | Broadband multi-band expressway phononic crystal sound barrier with information display function |
| CN216515208U (en) * | 2021-10-20 | 2022-05-13 | 北京交通大学 | Noise reduction device is strengthened on sound barrier top that combines Bragg scattering and cavity resonance |
-
2022
- 2022-06-01 CN CN202210618925.7A patent/CN114855660A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2374940A2 (en) * | 2010-04-06 | 2011-10-12 | Akustik & Raum AG | Absorbent noise barriers |
| KR20150097088A (en) * | 2014-02-18 | 2015-08-26 | 주식회사 에스엠컴퍼니 | Vented two-way sound insulation board for noise barrier |
| CN107245963A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound barrier that phonon crystal is scattered based on Bragg |
| CN107245964A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound-absorbed barrier top structure that phonon crystal is scattered based on Bragg |
| US20200005756A1 (en) * | 2018-07-02 | 2020-01-02 | Toyota Motor Engineering & Manufacturing North America, Inc. | Invisible sound barrier |
| WO2020098477A1 (en) * | 2018-11-15 | 2020-05-22 | 中车株洲电力机车有限公司 | Low-frequency coupling sound absorbing structure |
| CN209243600U (en) * | 2018-12-25 | 2019-08-13 | 大连明日环境发展有限公司 | A kind of sound absorption sound barrier |
| CN112002300A (en) * | 2020-10-12 | 2020-11-27 | 株洲时代新材料科技股份有限公司 | Broadband resonance sound absorption method and structure |
| KR102223580B1 (en) * | 2020-10-21 | 2021-03-05 | 주식회사 자돌 | High functional complex noise reduction device |
| CN112227237A (en) * | 2020-11-10 | 2021-01-15 | 广州地铁设计研究院股份有限公司 | Sound barrier containing air resonant cavity |
| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
| CN216074826U (en) * | 2021-10-20 | 2022-03-18 | 北京交通大学 | Broadband multi-band expressway phononic crystal sound barrier with information display function |
| CN216515208U (en) * | 2021-10-20 | 2022-05-13 | 北京交通大学 | Noise reduction device is strengthened on sound barrier top that combines Bragg scattering and cavity resonance |
| CN113981848A (en) * | 2021-11-17 | 2022-01-28 | 山西省交通环境保护中心站（有限公司） | Highway honeycomb noise reduction screen |
Non-Patent Citations (1)
| Title |
|---|
| 张思文;张军;章晓轩;刘宏玉;刘从光;朱冠妮;: "局域共振声子结构在汽车地毯低频隔声中的应用", 汽车工程, no. 03, 25 March 2016 (2016-03-25) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180626A (en) * | 2022-11-23 | 2023-05-30 | 兰州交通大学 | Rail transit sound barrier based on single hollow primitive cell |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100399734B1 (en) | Sound absorption structure | |
| CN202595645U (en) | Sound barrier suitable for rail transit | |
| CN105803965B (en) | A kind of broadband sound absorption cell board | |
| CN202577174U (en) | Noise reduction shield | |
| CN111058391B (en) | Novel sound barrier containing resonant cantilever beam | |
| CN114855660A (en) | Phononic crystal sound absorber, sound barrier and using and mounting method | |
| CN106480832A (en) | A kind of noise reducing mechanism and its sound barrier panel | |
| CN201222350Y (en) | Acoustical barrier | |
| CN202500097U (en) | Combined sound barrier | |
| CN112712784A (en) | Low-frequency broadband flat plate sound absorption structure | |
| EP3093391A1 (en) | Sound-proofing utility, especially a sound-attenuating unit | |
| JP4019820B2 (en) | Sound absorbing structure | |
| KR200410391Y1 (en) | Absorption type transparent soundproof wall | |
| KR200380479Y1 (en) | Soundproof tunnel | |
| CN211446650U (en) | Transparent sound absorption cap for top of sound insulation barrier | |
| JPH04281905A (en) | Sound absorber and sound absorbing panel by use thereof | |
| JP3843389B2 (en) | Sound absorbing structure | |
| JP3914395B2 (en) | Noise reduction device, sound insulation wall with the noise reduction device, and method of mounting the same | |
| JP2004124601A (en) | Soundproof construction and sound insulating wall | |
| CN201512730U (en) | Sound-absorption wedge plate for reducing wheel rail noises and tunnel pressure waves | |
| CN215976921U (en) | Louvered muffler device | |
| CN220868012U (en) | Light composite acoustic super-structure barrier sound absorption board | |
| CN218596964U (en) | Combined broadband sound barrier for highway | |
| KR20020072345A (en) | Sound absorption type soundproofing panel | |
| JP4673504B2 (en) | Sound absorbing and insulating panel and soundproof wall using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |