CN213328724U - Sound barrier combining Bragg scattering and sound absorption resonance wave-shaped phononic crystal of highway - Google Patents
Sound barrier combining Bragg scattering and sound absorption resonance wave-shaped phononic crystal of highway Download PDFInfo
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Abstract
The utility model relates to a resonance wave form highway phononic crystal sound barrier combining Bragg scattering and sound absorption, which comprises a fixed bottom plate (1), anchor bolts (2), a connecting tie beam (3), a scattering sound absorber (4) and a rock wool medium (5); the connecting tie beam (3) is connected with and fixes the adjacent scattering sound absorbers (4); the fixed bottom plate (1) is connected with, supports and fixes the scattering sound absorber (4); the fixed bottom plate (1) is in direct contact with the ground. The scattering sound absorber of the utility model adopts steel upright columns with different heights, and the steel upright columns are arranged in a square lattice; the sound barrier is wavy when viewed from the front and is heightened layer by layer; the scattering sound absorber is filled with rock wool medium for sound absorption, and under the combined action of the Bragg interference noise elimination mechanism and the resonant cavity sound absorption mechanism, the sound barrier structure of the phononic crystal can effectively attenuate traffic noise of 0-500Hz and 800-1250Hz main noise frequency bands of the highway to the maximum extent, so that the sound pressure level of a sound receiving point is reduced.
Description
Technical Field
The utility model relates to a highway traffic noise control technical field, concretely relates to combine Bragg scattering and sound absorption resonance wave form highway phononic crystal sound barrier.
Background
The highway is built to bring great convenience to society and also bring serious noise pollution to residents along the highway, and in the traffic trunk line of China, the roadside environmental noise is higher than 70dB (A) noise level in the daytime and higher than 55dB (A) noise level at night by 80%. The problem of road noise pollution which is becoming more and more serious has become an environmental problem that is not visible for tens of thousands in road construction. The sound barrier is the most effective control means for solving the problem of noise pollution of the highway, however, the traditional sound barrier mostly belongs to a uniform medium structure, the increase of the material cost and the construction difficulty can be brought by increasing the surface density of the material, and a new thought is provided by the periodic phononic crystal structure.
The principle of the sound barrier is to see the propagation process of noise, i.e. from the noise source to the receiving point, as a straight line, and when we place the sound barrier between the noise source and the receiving point, the sound barrier can block the propagation path of the noise. Some of the transmitted sound energy is reflected or scattered back to the noise source, while other parts pass through the barrier, are diffracted from the edge of the barrier or are absorbed by the material, and the sound barrier provides significant additional attenuation of the noise during propagation, typically reducing the noise by 5dB to 15 dB.
The sound barrier may be classified into various categories according to the structure, material, acoustic characteristics, and the like of the sound barrier. According to the difference of the appearance shape of the sound barrier, the sound barrier can be classified into an upright type, a folded arm type, an inclined type, a closed type, and the like. The folding arm type comprises an arc, an inverse L shape and the like; the inclined type comprises inward inclination and outward inclination; the closed type comprises a fully closed type and a semi-closed type; some sound barriers also include separate roof assemblies to facilitate Y-shaped roofs, multiple edge roofs, antler roofs, T-shaped roofs, etc. Can be summarized into concrete, metal, acrylic and the like according to the difference of materials. The absorption noise and the reflection noise can be summarized according to the difference of the noise reduction characteristics.
The used material of traditional sound barrier is of a great variety, and the rate of utilization such as metal sheet, composite board and plank at present is higher relatively, but these materials are mostly even dielectric material, and noise reduction relies on mass density theorem, and that is to say that the sound insulation performance of material and the areal density of material become positive correlation, and research shows, areal density increases one time, and noise reduction increases 6 dB. Therefore, in order to obtain higher noise reduction effect, the density of the sound barrier material can only be increased, but the material cost and the operation difficulty level are greatly increased, so that the application of the traditional sound barrier material has certain limitation. In order to reduce noise more effectively during the noise transmission process, some new sound insulation technologies, such as introduction of smart materials, have been adopted. However, the smart materials are expensive, have different difficulties in use and are not widely used.
A common structure of a sound barrier in the prior art is shown in fig. 2. In addition, the chinese patent of the invention with publication number CN111270621A provides a two-dimensional phononic crystal sound barrier structure, which comprises cubic phononic crystal cells and a fixing plate, wherein the cubic phononic crystal cells are made of common steel material, and the fixing plate regularly arranges and fixes the cubic phononic crystal cells; the phononic crystal sound barrier structure is mainly used for noise reduction of railway lines, is convenient to detach and install, has low requirements on working environment, plays a role in vibration and noise reduction on wheel track vibration and noise caused by irregularity of railway lines, reduces noise generated by railway train wheels, improves noise and vibration characteristics of the railway train wheels, and reduces influence on surrounding environment.
However, with the recent adoption of a large number of sound barriers, the problems thereof have been gradually revealed. Firstly, the existing noise barrier noise reduction lacks pertinence, leading factors generated by different types of road noise are different, characteristic noise frequency spectrums are different, and no targeted setting is provided at present. Secondly, the continuous sound barrier obstructs the flow of air, and the continuous pulsating wind pressure generated during the high-speed running of the vehicle and the wind load in the natural environment can cause the service life of the sound barrier to be shortened, thereby failing to satisfy the safety and stability, and simultaneously possibly causing sound leakage. Thirdly, the tall and large closed sound barrier can block light, influence the vision of a driver, cause an isolated feeling, and is not favorable for blending with the landscape along the line from the aesthetic point of view.
Phononic crystals are periodic composite materials characterized by elastic band gaps, and the fundamental characteristic is that elastic waves in a band gap frequency range are suppressed when propagating in the phononic crystal, so that the phononic crystal is often used for vibration and noise reduction in a specific frequency range.
The photonic crystal type sound barrier overcomes three defects of the traditional sound barrier, can carry out band gap design according to specific traffic noise characteristic frequency spectrum, and has more pertinence; the ventilation can reduce the wind area, prolong the service life, and the light transmission is beneficial to the vision of the driver; the appearance design is flexible and changeable, has higher artistic design potential, and can be blended with landscape along the line.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned technical problem that exists among the prior art, the utility model provides a wave highway phononic crystal sound barrier who combines Bragg scattering and acoustic resonance realizes carrying out effective decay to highway main noise frequency range 0-500Hz, 800 supplyes 1250 Hz's traffic noise furthest, reduces the sound pressure level that receives sound point department, makes the noise reduction effect of sound barrier more effective, more have pertinence.
In order to achieve the above purpose, the present invention adopts the following technical solution.
The utility model discloses a wave highway phononic crystal sound barrier combining Bragg scattering and sound absorption resonance, which comprises a fixed bottom plate, foundation bolts, connecting tie beams, a scattering sound absorber and rock wool media; the rock wool medium is filled in the scattering sound absorber; the connecting tie beam is used for connecting and fixing adjacent scattering sound absorbers; the fixed bottom plate is connected with, supports and fixes the scattering sound absorber; the fixed bottom plate is in direct contact with the ground, and is connected with the ground through foundation bolts.
Preferably, the fixed bottom plate is made of a flat rigid plastic plate or a metal plate.
In any of the above technical solutions, it is preferable that the scattering sound absorber is welded to the fixing base plate, and stiffening plates are welded to both sides of the scattering sound absorber.
In any of the above solutions, it is preferable that the connecting tie beam is located in the middle of the sound scattering absorber.
In any of the above technical solutions, it is preferable that the scattering sound absorber uses steel columns with different heights, and is arranged in a square lattice.
The utility model discloses a phononic crystal sound barrier regards as the scattering sound absorber with opening steel stand, and the interior attaches porous sound-absorbing medium for the sound barrier is wavy design from openly seeing, and the successive layer increases.
In any of the above technical solutions, preferably, the steel upright post adopted by the scattering sound absorber is made of a stainless steel pipe by machining, the outer diameter R of the steel pipe is 0.085m, the inner diameter R of the steel pipe is 0.075m, the wall thickness T of the steel pipe is 0.01m, and the opening angle β of the scattering sound absorber is 60 °.
The utility model discloses a phononic crystal sound barrier, scattering sound absorber adopt nonrust steel pipe processing to make, and the sound wave passes through the opening and gets into the resonant cavity, and with the violent friction of intracavity air, the effect of making an uproar is fallen in the consumption sound energy, plays.
In any one of the above technical solutions, preferably, the rock wool medium is bonded to the inner wall of the scattering sound absorber: filling No. 2 fiber average diameter glass wool with thickness t of 0.03m along the circumference in the scattering sound absorption body, wherein the hydrophobic rate is not less than 98 percent, and the volume weight is 50kg/m3A thermosetting resin is used as the binder.
The utility model discloses a phononic crystal sound barrier at the cotton medium of scattering sound absorber internal packing fiber glass, this kind of porous sound absorbing medium plays the effect of absorbing the sound wave.
In any of the above technical solutions, it is preferable that the sound scattering and absorbing body has an opening arranged perpendicular to the road direction.
In any of the above technical solutions, preferably, the scattering sound absorbers are arranged according to a square lattice, and the lattice constant is a, that is, the distance between the horizontal center and the vertical center of adjacent scattering sound absorbers is 0.2 m.
In any of the above solutions, it is preferable that the sound scattering and absorbing body is designed in 4 rows.
The utility model discloses a phononic crystal sound barrier, the scattering sound absorber can adopt 4 rows of designs, the opening direction forward road of scattering sound absorber.
In any of the above technical solutions, preferably, when installing the scattering sound absorbers with different heights, a wave-shaped arrangement structure with a high middle and low two sides is adopted, the scattering sound absorbers are sequentially arranged from the first row, and the height of the rear row is higher than that of the front row to form a hierarchy. The utility model discloses a phononic crystal sound barrier adopts this kind of installation arrangement structure, can effectively reduce the top diffraction sound of sound barrier, strengthens the ability of making an uproar of falling of sound barrier.
Compared with the prior art, the above technical scheme of the utility model following beneficial effect has:
due to the band gap characteristic of the phononic crystal, the phononic crystal is designed aiming at the main noise frequency band of the highway, has pertinence, simultaneously considers the combination of the cavity resonance, the porous sound absorption medium and the destructive interference principle of Bragg scattering, realizes the phononic crystal type sound barrier combining multiple noise reduction mechanisms, and effectively enhances the noise reduction performance of the sound barrier.
The phononic crystal type sound barrier is a discontinuous closed sound barrier, so that the influence of pulsating wind pressure of traffic flow is reduced by ventilation, and the service life of the sound barrier is prolonged; the light-transmitting screen is light-transmitting, is beneficial to the vision of a driver during driving, and avoids the isolation feeling of the driver caused by the conventional high and large closed sound barrier.
The phononic crystal type sound barrier is designed according to the wave shape, so that the phononic crystal type sound barrier has higher aesthetic property and can be fused with landscape along the line; secondly, the arrangement of heightening layer by layer is adopted, so that the diffraction sound at the top end of the sound barrier can be effectively reduced, and the noise reduction performance of the sound barrier is enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of the noise reduction principle of a sound barrier;
FIG. 2 is a schematic diagram of a prior art sound barrier structure;
FIG. 3 is a schematic diagram of lattice unit cells of a phononic crystal type sound barrier in accordance with a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 4 is a schematic illustration of the phononic crystal unit cell band structure of a preferred embodiment of a phononic crystal sound barrier in accordance with the present invention;
FIG. 5 is a top view of a preferred embodiment of a phononic crystal type sound barrier in accordance with the present invention;
FIG. 6 is a front view of a phononic crystal type sound barrier in accordance with a preferred embodiment of the phononic crystal sound barrier of the present invention;
FIG. 7 is a side view of a phononic crystal type sound barrier in accordance with a preferred embodiment of the phononic crystal sound barrier of the present invention;
fig. 8 is a top plan view of an indoor semi-anechoic experimental arrangement of a phononic crystal sound barrier in accordance with the present invention;
fig. 9 is a side view of an indoor semi-anechoic experimental arrangement of a phononic crystal sound barrier in accordance with the present invention.
Reference numerals: 1. the sound absorption device comprises a fixed bottom plate, 2, foundation bolts, 3, a connecting tie beam, 4, a scattering sound absorber, 5, rock wool media, 6 and a stiffening plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 shows a schematic diagram of the main principle of noise reduction of a sound barrier. The sound barrier is used as a noise reduction form of end noise control, is the most widely applied in the traffic field, and is recognized as the most effective measure, and the barrier is inserted between a sound source and a sound receiving point to prevent the noise from directly transmitting to the sound receiving point. Most of the sound waves are detoured to the sound receiving point through the top of the sound barrier, except that a small portion of the sound waves reach the sound receiving point through transmission and multiple reflections. The inserted barrier changes the propagation path of sound waves, indirectly increases the attenuation propagation distance and plays a role in reducing sound pressure of sound receiving points. Fig. 2 is a schematic structural diagram of a conventional sound barrier. On the basis of the original vertical sound barrier, the arrangement of the sound diffraction prevention structure at the top end of the sound barrier is the main idea of the current sound barrier design, and the purpose of enhancing the noise reduction effect is achieved through the change of the height and the structural form.
On the basis of the prior art, the embodiment of the utility model provides a wave highway phononic crystal sound barrier who combines Bragg scattering and acoustic resonance to realize furthest and carry out effective decay to highway main noise frequency range 0-500Hz, 800-.
The phononic crystal sound barrier of this embodiment mainly includes five parts of PMKD 1, rag bolt 2, connection tie beam 3, scattering sound absorber 4 and rock wool medium 5. The fixed base plate 1 is a flat rigid plastic plate or a metal plate, and plays a role of connecting, supporting and fixing the scattering sound absorber 4. The scattering sound absorber 4 is welded on the fixed bottom plate 1, and stiffening plates are welded on two sides of the scattering sound absorber 4. The fixed bottom plate 1 is in direct contact with the ground and is connected by the foundation bolts 2. The connecting tie beam 3 is positioned in the middle of the scattering sound absorber 4, plays a role in fixing the adjacent scattering sound absorbers and enhances the overall stability. The scattering sound absorber is designed by adopting steel upright columns with different heights and is arranged in a square lattice manner; the sound barrier is wavy when viewed from the front and is heightened layer by layer. The scattering sound absorber 4 is filled with rock wool medium for sound absorption. Under the combined action of the Bragg interference noise elimination mechanism and the resonant cavity sound absorption mechanism, the sound barrier structure of the phononic crystal can effectively attenuate traffic noises with main noise frequency ranges of 0-500Hz and 800-1250Hz on the highway to the greatest extent, so that the sound pressure level at the sound receiving point is reduced, and the noise reduction effect of the sound barrier is more effective and has pertinence.
The phononic crystal sound barrier of this embodiment adopts opening steel stand as the scattering sound absorber, attaches porous sound absorption medium in, and the sound barrier is the wave and designs:
the phononic crystal sound barrier combining the Bragg scattering mechanism and the sound absorption resonance mechanism in the embodiment can fully play the advantage of the phononic crystal sound barrier in improving the road area environment landscape function while ensuring the noise reduction effect, fully optimize and improve the road area landscape quality and the visual environment quality of the expressway, and prolong the service life of the sound barrier. The technical scheme of the embodiment also provides theoretical guidance and technical support for the acoustical design of the phononic crystal sound barrier in China.
The scattering sound absorber is made of a stainless steel pipe, the outer diameter of the steel pipe is 0.085m, the inner diameter of the steel pipe is 0.075m, the wall thickness of the steel pipe is 0.01m, and the opening angle beta of the scattering sound absorber is 60 degrees. The sound wave enters the resonant cavity through the opening, and is violently rubbed with air in the cavity to consume sound energy, so that the noise reduction effect is achieved.
The inside of the scattering sound absorber is filled with No. 2 fiber glass wool with the thickness of 0.03m along the circumference, the hydrophobic rate is not less than 98 percent, and the volume weight is 50kg/m3A thermosetting resin is used as the binder. The porous sound absorbing medium plays a role of absorbing sound waves.
Meanwhile, attention needs to be paid when the scattering sound absorber 4 is installed, and the openings of the scattering sound absorber are arranged perpendicular to the road direction.
The scattering sound absorbers 4 are arranged in a square lattice with a lattice constant a, i.e. the distance between the horizontal and vertical centers of adjacent scattering sound absorbers is 0.2 m.
When the scattering sound absorbers with different mounting heights h are installed, the wave patterns with high middle and low two sides are arranged, the wave patterns are sequentially arranged from the first row, the height of the rear row is higher than that of the front row, a layer is formed, the top diffraction sound of the sound barrier can be effectively reduced, and the noise reduction capability of the sound barrier is enhanced.
And the tie beam is arranged in the middle of each scattering sound absorber to play a role in enhancing the overall stability of the sound barrier.
The technical solution specifically adopted by the embodiments of the present invention and the characteristics thereof, as well as the implementation and testing effect are described in detail below with reference to fig. 3 to 9.
Fig. 3 is a schematic diagram of a unit cell structure of an open type sound-absorbing scatterer. As shown in fig. 3, the embodiment of the present invention combines the Bragg scattering mechanism with the sound absorption local resonance mechanism, the internal structure of the scattering sound absorber 4 is composed of the steel scattering body wall and the rock wool medium 5, and because the acoustic impedance of steel is far greater than air, when the sound wave is transmitted to the steel scattering body wall from the air matrix, the total reflection occurs on the interface, the destructive interference occurs inside the phononic crystal, so that the sound wave of a part of specific frequency cannot be transmitted, and the noise reduction effect of the specific frequency is achieved; meanwhile, opening processing is carried out on the scattering sound absorber 4, so that sound waves enter the scattering sound absorber 4 through the opening and rub and vibrate with air in the cavity, and therefore sound energy is converted into heat energy which is localized in the cavity to play a role in noise reduction; rock wool medium 5 is bonded on the inner wall of the steel scatterer, and rock wool is a porous sound absorption medium, so that when sound waves are localized in the cavity, the sound absorption effect can be achieved, and the further noise reduction effect can be achieved.
FIG. 4 is a schematic diagram of the band structure of the open-cell phononic crystal. From fig. 4, it can be known that in the major noise frequency ranges of 0-500Hz and 800-1250Hz on the highway, the phononic crystal type sound barrier can generate corresponding complete forbidden bands, and in the complete forbidden bands, sound waves cannot be continuously transmitted, so that the noise reduction function at specific frequency is achieved, and the specific effect is more pertinent.
Fig. 5 is a top view of the structure of the phononic crystal type sound barrier. As shown in fig. 5, the rock wool medium 5 with a thickness t of 0.03m is adhered to the inner wall 4 of the steel scatterer through thermosetting resin, the scattering sound absorber 4 is connected with the fixing base plate 1 through welding, the fixing base plate 1 is connected with the ground through the anchor bolts 2, a stiffening plate with a height of 0.2m and a thickness of 0.02mm is further welded between the two sides of the scattering sound absorber 4 and the fixing base plate 1, and further, the connecting tie beam 3 with a diameter of 0.06m connects the adjacent scattering sound absorbers 4, so that the overall stability is increased. As can be seen from fig. 5, the scattering sound absorbers 4 are arranged in a square lattice, and the horizontal and vertical distances between adjacent scattering sound absorbers 4 are set to a lattice constant a of 0.2 m.
Fig. 6 is a front view of a phononic crystal sound barrier. As can be seen from fig. 6, the phononic crystal type sound barrier is wavy and high, and the height h of the first row of sound scattering absorbers is 2.5-3.2m, and the total of 8 kinds of sound scattering absorbers are 2.8m, 2.7m, 2.6m, 2.5m, 2.6m, 2.7m, 2.8m, 2.9m, 3.0m, 3.1m, 3.2m, 3.1m, 3.0m and 2.9m from left to right in the figure. The height h of the second row of scattering sound absorbers is 2.6-3.3m, and the total of 8 kinds of scattering sound absorbers are 3.0m, 3.1m, 3.2m, 3.3m, 3.2m, 3.1m, 3.0m, 2.9m, 2.8m, 2.7m, 2.6m, 2.7m, 2.8m and 2.9m from left to right in the figure. The height h of the third row of scattering sound absorbers is 2.9-3.6m, and the total of 8 kinds of scattering sound absorbers are 3.2m, 3.1m, 3.0m, 2.9m, 3.0m, 3.1m, 3.2m, 3.3m, 3.4m, 3.5m, 3.6m, 3.5m, 3.4m and 3.3m from left to right in the figure. The height h of the fourth row of scattering sound absorbers is 3.1-3.7m, and the total of 8 kinds of scattering sound absorbers are 3.4m, 3.5m, 3.6m, 3.7m, 3.6m, 3.5m, 3.4m, 3.3m, 3.2m, 3.1m, 3m, 3.1m, 3.2m and 3.3m from left to right in the figure.
Fig. 7 is a side view of a phononic crystal type sound barrier. As can be seen from fig. 7, the height of the sound scattering absorber is increased row by row, and the connecting tie beam is located at 1.5m of the height of the sound scattering absorber.
Fig. 8 and 9 are layout diagrams of indoor experiments for testing the noise reduction effect of the phononic crystal type sound barrier, and a semi-free field condition is simulated in a semi-anechoic laboratory to perform an indoor semi-anechoic fluctuation experiment. Continuously emitting white noise of 70dB (A) at a distance of 1.5m and 1.2m from the front of the sound barrier by using an MHY-14324 type 12-body sound source and an HA12-AWA5870A type power amplifier, wherein the white noise is emitted by LMS virtual LabTMThe noise test analysis system measures the noise sound pressure level of a receiving end, the positions of the receiving end are respectively arranged at positions where d is 1.5m, 3m, 6m, 12m, 24m and 30m after the sound barrier, the positions are 1.2m higher, relevant data are recorded, the sound pressure levels of the receiving end before and after the sound barrier is arranged are respectively recorded, corresponding insertion loss is calculated, and the A weighting sound pressure level insertion loss of 6 field points is takenThe average value of (A) was used as an evaluation criterion.
The experimental result shows that in the complete forbidden band, the phonon crystal type sound barrier has good noise reduction performance, the average noise reduction amount is 17.1dB in 0-500Hz, and 20.2dB in 800-1250 Hz.
The phononic crystal type sound barrier of the embodiment performs targeted broadband noise reduction on a main noise frequency band of a highway by combining Bragg scattering and sound absorption resonance. By adopting the wave-shaped appearance design, the top diffraction sound of the sound barrier is effectively reduced, and the effect of beautifying the landscape along the line is achieved, and experiments prove that the phononic crystal-shaped sound barrier has good noise reduction performance.
The above description is only intended to describe the preferred embodiments of the present invention, and not to limit the scope of the present invention; the above description is only a specific embodiment of the present invention, and is not intended to limit the scope of the present invention; without departing from the spirit of the present invention, any modification, equivalent replacement, or improvement made by the technical solution of the present invention by those of ordinary skill in the art should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A sonic crystal sound barrier combining Bragg scattering and sound absorption resonance wave-shaped expressway comprises a fixed bottom plate (1), foundation bolts (2), and is characterized by further comprising a connecting tie beam (3), a scattering sound absorber (4) and a rock wool medium (5); the rock wool medium (5) is filled in the scattering sound absorber (4); the connecting tie beam (3) is connected with and fixes the adjacent scattering sound absorbers (4); the fixed bottom plate (1) is connected with, supports and fixes the scattering sound absorber (4); the fixed bottom plate (1) is in direct contact with the ground, and is connected with the ground through foundation bolts (2).
2. The combined Bragg scattering and acoustic resonance wave form highway phononic crystal sound barrier according to claim 1, wherein said fixed bottom plate (1) is a flat rigid plastic or metal plate.
3. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 1, wherein the scattering sound absorber (4) is welded to the fixed base plate (1) and stiffening plates (6) are welded to both sides of the scattering sound absorber (4).
4. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 1, wherein said connecting tie beam (3) is located in the middle of the scattering sound absorber (4).
5. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 3, characterized in that said scattering sound absorbers (4) are made of steel uprights of different heights, arranged in a square lattice.
6. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 5, characterized in that the scattering sound absorber (4) is manufactured by machining a steel upright from a stainless steel tube having an outer diameter R of 0.085m, an inner diameter R of 0.075m, a wall thickness T of 0.01m and an opening angle β of the scattering sound absorber (4) of 60 °.
7. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 6, wherein the inner wall of the scattering sound absorber (4) is bonded with a rock wool medium (5): the inside of the scattering sound absorber (4) is filled with No. 2 fiber average diameter glass wool with the thickness t of 0.03m along the circumference, the hydrophobic rate is not less than 98 percent, and the volume weight is 50kg/m3A thermosetting resin is used as the binder.
8. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 7, characterized in that said scattering sound absorber (4) is arranged with openings perpendicular to the road course.
9. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 8, wherein said scattering sound absorbers (4) are arranged in a square lattice with a lattice constant a, i.e. the distance between the horizontal and vertical centers of adjacent scattering sound absorbers is 0.2 m.
10. The combined Bragg scattering and acoustic resonance wave-shaped highway phononic crystal sound barrier according to claim 9, wherein said scattering sound absorber (4) is of a 4-row design.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719451A (en) * | 2020-06-30 | 2020-09-29 | 北京交通大学 | Corrugated expressway phononic crystal sound barrier combining Bragg scattering and acoustic resonance |
| DE102022205321A1 (en) | 2022-05-27 | 2023-11-30 | Autobahnen- Und Schnellstrassen-Finanzierungs-Aktiengesellschaft | Soundproofing device with vibroacoustic metamaterials |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111719451A (en) * | 2020-06-30 | 2020-09-29 | 北京交通大学 | Corrugated expressway phononic crystal sound barrier combining Bragg scattering and acoustic resonance |
| DE102022205321A1 (en) | 2022-05-27 | 2023-11-30 | Autobahnen- Und Schnellstrassen-Finanzierungs-Aktiengesellschaft | Soundproofing device with vibroacoustic metamaterials |
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