CN108396668A - Denoising structure at the top of the anti-diffraction sound barrier of low frequency - Google Patents
Denoising structure at the top of the anti-diffraction sound barrier of low frequency Download PDFInfo
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- CN108396668A CN108396668A CN201810245418.7A CN201810245418A CN108396668A CN 108396668 A CN108396668 A CN 108396668A CN 201810245418 A CN201810245418 A CN 201810245418A CN 108396668 A CN108396668 A CN 108396668A
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- sound barrier
- cavity
- low frequency
- diffuser
- diffraction
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- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The present invention relates to denoising structures at the top of the anti-diffraction sound barrier of low frequency, it is made of protection slab (1), cavity (2), diffuser structure (3), protection slab (1) forms composite construction with diffuser (3) connection, cavity (2) is opened in the diffuser structure (3), and diffuser structure (3) is connected to the top of sound barrier screen body (5).Compared with prior art, the present invention can effectively reduce the low frequency diffraction acoustic energy on sound barrier top, expand the range of sound barrier rear acoustic shadow, improve the noise reduction of noise barrier structure, be suitable for noise abatement place and the environment of any required anti-low frequency diffraction.
Description
Technical field
The invention belongs to environmental engineering speciality field of noise control, at the top of a kind of anti-diffraction sound barrier of low frequency
Denoising structure.
Background technology
With the expansion of city size and the raising of living standards of the people, pollution from environmental noise problem is that society is each in recent years
One of the hot spot that boundary is concerned about extensively, and traffic noise pollution problem is difficulties therein.In the inhabitation life for adjoining road
Area living, to reduce the influence of traffic noise, at present frequently with setting up this Noise Control measure of sound barrier.
Sound barrier is the special construction produced using sound-absorbing material and sound insulating material, setting noise source with by sound point it
Between, it can be formed behind barrier " acoustic shadow ", noise sound level is decreased obviously in acoustic shadow.The construction of sound barrier has blocked direct sound wave
Propagation, by noise source and protection target separate, so that protection target is fallen in acoustic shadow, be finally reached reduce noise purpose.
Phenomena such as reflection, transmission and diffraction will be generated when the sound wave propagated in air normally encounters sound barrier, wherein frequency is higher
Noise section is easy to decay in communication process, and low-frequency noise more difficult decaying in communication process, is easy to pass through sound barrier top
Portion and lateral diffraction propagation, but since sound barrier length is generally longer, lateral diffraction can be ignored, to which top diffraction becomes low
The main path of frequency noise transmission, which greatly limits the raisings of sound barrier noise reduction.
Chinese patent CN201221058Y discloses a kind of V-shaped top noise reducer for acoustical barrier, is in V-shape, by V
Type frame and the sound-absorbing material cover board composition on V-type frame, V-type frame is by two peripheral thin plates and two interior thin plate groups
At two interior thin plates are located therein on peripheral thin plate, and it is thin to be set to a shorter side for longer side thin plate wherein in the thin plate of both sides
Fixed cover board between at the top of the front end of plate, side thin plate and peripheral thin plate and side thin plate and side thin plate, can thus form cavity.But
Being the patent still can not reduce or eliminate low frequency diffraction acoustic energy.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of realizations to diffraction sound
Denoising structure at the top of the anti-diffraction sound barrier of low frequency of energy effective attenuation.
The purpose of the present invention can be achieved through the following technical solutions：
Denoising structure at the top of the anti-diffraction sound barrier of low frequency, is made of protection slab, cavity, diffuser structure,
The protection slab links to form composite construction with the diffuser, and the cavity is opened in the diffusion
In body structure, the diffuser structure is connected to the top of sound barrier screen body.
The protection slab is covered in the upper surface of entire diffuser structure.
The protection slab is made of perforated plate, microperforated panel or fiberboard, and perforated plate punching rate is micro- to wear no more than 10%
Orifice plate punching rate is no more than 5%, and fiberboard punching rate is no more than 25%.
The cavity is cavity, or can also be filled with mineral wool or polyurethane foam in the cavity.
For cavity in the diffuser structure using the one-dimensional slot form setting of quadratic remainder, the direction of cavity setting is parallel
In screen body trend.Each cavity it is of same size, in 5-15cm, depth spreads series arrangement by quadratic remainder, most very much not surpasses for control
35cm is crossed, osculum is additionally provided in the bottom of each cavity.
Quadratic remainder sequence diffuser is formed by slot structure by the cavity of different depth and forms, when sound wave incident to knot
It after structure, will be reflected from the groove void of different depth, due to each groove void depth difference, incident acoustic wave can be broken down into many small
Weaker reflection sound wave, and spread add acoustic energy to a wide range direction, therefore have good diffusion.
Phase of the sound wave after undergoing different distance is inconsistent simultaneously, interference offseting phenomenon is generated at body structure surface, therefore secondary remaining
Number Sequence diffuser structure has certain sound absorbing performance in design frequency and its resonant frequency, but its acoustic absorptivity is not high.
Perforation resonant structure is that very extensive resonance acoustic construction is used in a kind of noise abatement, and operation principle is mainly due to the last of the twelve Earthly Branches
Mu Huozi resonant structures make the acoustic energy of certain frequencies that acutely oscillation, interference and friction occur to decay in interface, although
It has in design frequency compared with high acoustic absorption performance, but sound absorption peak is single, and sound sucting band is narrow.
Since perforation resonant structure and the sound absorption feature of quadratic remainder sequence diffuser structure are complementary, and acoustic energy consumption ways
It is close, therefore denoising structure at the top of the sound barrier of decaying diffraction acoustic energy is obtained by diffusion, absorption pattern by the two is compound.When low
When frequency acoustic energy is spread by sound barrier top structure surface to rear side diffraction, a part of acoustic energy is resonated by perforation resonant structure to be inhaled
It receives, remaining acoustic energy is by quadratic remainder sequence diffuser structure scattered reflection to 180 ° of models perpendicular to noise barrier structure plane
It encloses on direction so that script single direction greatly reduces around the acoustic energy being mapped on rear side of sound barrier, to substantially increase sound barrier
The anti-acoustic capability of structure itself.
The diffuser structure is consolidated by holder and sound barrier screen body top attachment by way of bolt or welding
It is fixed.
Compared with prior art, the present invention realizes the effective attenuation to diffraction acoustic energy, due to diffuser structure and perforation
The compound action of resonant structure, the inventive structure not only remain to keep good diffusion within the scope of low and medium frequency, diffusion
Coefficient is between 0.8 to 0.95, and the inventive structure noise reduction is excellent, 100-500Hz's after being placed at the top of sound barrier
Insertion loss in frequency range averagely improves 5-9dB, and whole insertion loss improves 3~7dB.
Description of the drawings
Fig. 1 is the structural schematic diagram of denoising structure at the top of the anti-diffraction sound barrier of low frequency in embodiment 1；
Fig. 2 is the structural schematic diagram of denoising structure at the top of the anti-diffraction sound barrier of low frequency in embodiment 2；
Fig. 3 is the structural schematic diagram that denoising structure is combined with sound barrier screen body at the top of the anti-diffraction sound barrier of low frequency.
In figure, 1- protection slabs, 2- cavitys, 3- diffuser structures, 4- holders, 5- sound barrier screen bodies.
Specific implementation mode
Denoising structure at the top of the anti-diffraction sound barrier of low frequency, is made of protection slab, cavity, diffuser structure, protection slab and expansion
Granular media links to form composite construction, and cavity is opened in the diffuser structure, and diffuser structure passes through holder and sound barrier
Shield body top attachment, is fixed by way of bolt or welding.
Protection slab is covered in the upper surface of entire diffuser structure.The protection slab used can be perforated plate, microperforated panel
Or fiberboard, the perforated plate punching rate used are no more than 10%, microperforated panel punching rate is no more than 5%, and fiberboard punching rate is not
More than 25%.
The cavity being opened in diffuser structure is cavity, or can also be filled with mineral wool or polyurethane in the cavity
Foam.Cavity is oriented parallel to screen body trend using the one-dimensional slot form setting of quadratic remainder, cavity setting.The width of each cavity
Identical, in 5-15cm, depth spreads series arrangement by quadratic remainder for control, and maximum is no more than 35cm, the bottom of each cavity also
Equipped with osculum.The slot structure that quadratic remainder sequence diffuser is formed by the cavity of different depth forms, when sound wave incident arrives
It after structure, will be reflected from the groove void of different depth, due to each groove void depth difference, incident acoustic wave can be broken down into many
Small weaker reflection sound wave, and spread and add acoustic energy to a wide range direction, therefore there is good diffusivity
Energy.Phase of the sound wave after undergoing different distance is inconsistent simultaneously, interference offseting phenomenon is generated at body structure surface, therefore secondary
Remainder sequence diffuser structure has certain sound absorbing performance in design frequency and its resonant frequency, but its acoustic absorptivity is not
It is high.Perforation resonant structure is that very extensive resonance acoustic construction is used in a kind of noise abatement, operation principle mainly by
Make the acoustic energy of certain frequencies that acutely oscillation, interference occur in interface and rub to decay in helmholtz resonance structure,
Although it has in design frequency compared with high acoustic absorption performance, sound absorption peak is single, and sound sucting band is narrow.Due to resonant structure and two of perforating
The sound absorption feature of secondary remainder sequence diffuser structure is complementary, and acoustic energy consumption ways are close, thus by the two it is compound by diffusion,
Absorption pattern obtains denoising structure at the top of the sound barrier of decaying diffraction acoustic energy.When low frequency acoustic energy passes through sound barrier top structure surface
When being spread to rear side diffraction, a part of acoustic energy is by perforation resonant structure RESONANCE ABSORPTION, and remaining acoustic energy is by quadratic remainder sequence
Diffuser structure scattered reflection is on 180 ° of range directions of noise barrier structure plane so that script single direction diffraction
Acoustic energy on rear side of to sound barrier greatly reduces, to substantially increase the anti-acoustic capability of noise barrier structure itself.
With reference to specific embodiment, the present invention is described in detail.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Embodiment 1
Denoising structure at the top of the anti-diffraction sound barrier of low frequency, structure as shown in Figure 1, be made of microperforated panel protection slab 1,
Cavity 2, diffuser structure 3 are constituted.Microperforated panel parameter plate thickness 0.8mm, aperture 1mm, punching rate 2%, square arrangement；Diffusion
The cavity 2 opened up in body structure 3 is in 7 stage structures, and each width 12cm, depth is followed successively by 0,5cm, 20cm, 10cm, 10cm, 20cm,
5cm, and cavity is cavity.After tested, before and after inventive structure setting, sound barrier is in the frequency range of 100-500Hz
Insertion loss averagely improves 8dB.
Embodiment 2
Denoising structure at the top of the anti-diffraction sound barrier of low frequency, structure as shown in Fig. 2, be made of microperforated panel protection slab 1,
Cavity 2, diffuser structure 3 are constituted.In view of the bulk condition at the top of sound barrier, structure of the invention is by deeper cavity 2
It is deformed, to reduce the thickness of top structure entirety.Perforate board parameter plate thickness 2mm, aperture 2mm, and punching rate 8% is square
Shape arranges；The cavity 2 opened up in diffuser structure 3 is in 7 stage structures, and each width 10cm, depth is followed successively by 0,6cm, 24cm,
12cm, 12cm, 24cm, 6cm), cavity is cavity.Top structure is after deformation, integral thickness 15cm, is reduced than original thickness
Nearly 10cm.By test, the sound barrier insertion loss containing the inventive structure reaches 18dB.
Embodiment 3
The anti-diffraction sound barrier top structure of low frequency, is made of microperforated panel, cavity, quadratic remainder diffuser.Perforated plate is joined
Several plate thickness 1mm, aperture 2mm, punching rate 5%, square arrangement；Quadratic remainder diffuser parameter (7 stage structures, each groove width
9cm, groove depth are followed successively by 0,4cm, 16cm, 8cm, 8cm, 16cm, 4cm.), cavity is that unit weight is 32kg/m3.Pass through branch when use
Frame 4 is connected to the top of sound barrier screen body 5, as shown in Figure 3.Insertion loss at the inventive structure different frequency after tested, number
According to as shown in the table：
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (9)
1. denoising structure at the top of the anti-diffraction sound barrier of low frequency, which is characterized in that the denoising structure by protection slab (1), cavity (2),
Diffuser structure (3) is constituted,
The protection slab (1) forms composite construction with diffuser (3) connection, and the cavity (2) is opened in described
Diffuser structure (3) in, the diffuser structure (3) is connected to the top of sound barrier screen body (5).
2. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1, which is characterized in that the protection slab
(1) it is covered in the upper surface of entire diffuser structure (3).
3. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1 or 2, which is characterized in that the shield
Panel (1) is made of perforated plate, microperforated panel or fiberboard, and perforated plate punching rate is no more than 10%, and microperforated panel punching rate is not
More than 5%, fiberboard punching rate is no more than 25%.
4. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1, which is characterized in that the cavity
(2) it is cavity.
5. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1, which is characterized in that the cavity
(2) mineral wool or polyurethane foam are filled in.
6. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1 or 4 or 5, which is characterized in that described
Using the one-dimensional slot form setting of quadratic remainder, cavity (2) setting is oriented parallel to shield cavity (2) in diffuser structure (3)
Body moves towards.
7. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 6, which is characterized in that each cavity (2)
Of same size, control spreads series arrangement in 5-15cm, depth by quadratic remainder, and maximum is no more than 35cm.
8. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 6, which is characterized in that each cavity (2)
Bottom is additionally provided with osculum.
9. denoising structure at the top of the anti-diffraction sound barrier of low frequency according to claim 1, which is characterized in that the diffuser
Structure (3) passes through holder (4) and sound barrier screen body (5) top attachment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245418.7A CN108396668A (en) | 2018-03-23 | 2018-03-23 | Denoising structure at the top of the anti-diffraction sound barrier of low frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810245418.7A CN108396668A (en) | 2018-03-23 | 2018-03-23 | Denoising structure at the top of the anti-diffraction sound barrier of low frequency |
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| Publication Number | Publication Date |
|---|---|
| CN108396668A true CN108396668A (en) | 2018-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810245418.7A Pending CN108396668A (en) | 2018-03-23 | 2018-03-23 | Denoising structure at the top of the anti-diffraction sound barrier of low frequency |
Country Status (1)
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| CN (1) | CN108396668A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119085A (en) * | 2020-01-16 | 2020-05-08 | 湖南省交通科学研究院有限公司 | Sound barrier with semi-cylindrical top protruding structure |
| CN111636761A (en) * | 2020-06-10 | 2020-09-08 | 湖南大学 | Construction site sound arrester |
| CN114351607A (en) * | 2021-12-09 | 2022-04-15 | 上海交通大学 | Noise reduction structure at top of sound barrier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119085A (en) * | 2020-01-16 | 2020-05-08 | 湖南省交通科学研究院有限公司 | Sound barrier with semi-cylindrical top protruding structure |
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| CN114351607A (en) * | 2021-12-09 | 2022-04-15 | 上海交通大学 | Noise reduction structure at top of sound barrier |
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Application publication date: 20180814 |