CN207512628U - Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure - Google Patents
Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure Download PDFInfo
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- CN207512628U CN207512628U CN201721511955.9U CN201721511955U CN207512628U CN 207512628 U CN207512628 U CN 207512628U CN 201721511955 U CN201721511955 U CN 201721511955U CN 207512628 U CN207512628 U CN 207512628U
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Abstract
The utility model is related to a kind of bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structures.Depth is connected to form than several closed cavities being distributed by pseudo-random sequence by micropunch panel, cell separators, unit baseboard, left side, right side, front end face, rear end face, cavity number is the length of pseudo-random sequence.0.3%~4% micropore that occupied area is panel area is distributed on micropunch panel, micropore size is 0.2~1.2mm.As long as the utility model to be installed to the place handled that needs to absorb sound during use, it is fixed on wall surface.The utility model device is simple, simple processing, thin type is light, and sound absorbing performance is excellent, sound sucting band width of the acoustic absorptivity in 2KHz more than 0.8 is up to 3 octaves, the sound sucting band width of acoustic absorptivity treatment 0.6 is up to 4 octaves, and for peak value close to 1.0, sound absorbing performance is flat, it is widely applicable, easy cleaning, high temperature resistant, and with superior weatherability, can recycle completely.
Description
Technical field
The utility model category technical field of acoustics, specially a kind of bidimensional pseudo-random sequence reduced for Middle and low frequency noise
Micropunch ultrabroad band sound absorption structure.
Background technology
Problem of noise pollution is with the development of urban economy and the growth getting worse of population, and noise pollution is to the shadow of people
It rings caused complaint and all kinds of environment are complained more than 50% is accounted in economically developed city.With the propulsion of Process of Urbanization Construction, no
Disconnected increased social activities and the living environment low frequency characteristic that equipment is used to cause people are apparent, this just often results in ambient noise
Sound pressure level when being also not up to standard limited value, subjective sensation is worried by people.Low-frequency noise can generate the thinking ability of people
It interferes significantly with, influences the auditory system, nervous system and cardiovascular system of people.Therefore low-frequency noise is ground in recent ten years
Study carefully and earn widespread respect, the research of low-frequency sound-absorbing structure is one of hot spot therein.
Sound absorption structure is one of important measures in noise control technique.Traditional sound absorption structure be mostly hole fibrous material such as
Mineral wool, rock wool etc., additional perforated face plate.Porous fibrous material has the advantages that sound absorbing performance is good, but there are weatherability it is poor,
Sound absorbing performance fails and is used for a long time fiber generation the problem of flying upward, causing secondary pollution after being moistened, and health is produced
Raw harm.Usual porous fibrous material needs to be replaced after a period of use, and can also be endangered in production, process fiber
Human body.Due to resonance sound-absorbing structure moisture resistant, hygiene, environmental-friendly etc. than conventional porous fibrous material have it is excellent
More property, has been more and more widely used, and has the trend of substitution traditional fibre material.The mechanism of novel resonance sound-absorbing structure,
Computation model and development and application also always constantly develop it is perfect.
With the enhancing and improvement of living standard of people's environmental consciousness, no fiber absorbing material is more and more weighed
Depending on the trend for gradually replacing traditional porous fibrous material is presented.What is developed at present mainly has micro- wear without fiber absorbing material
Hole sound absorber, aluminum fabric acoustic absorption material, foaming aluminum sound-absorbing material, foam glass, polyurethane sound absorption foam etc..Foam glass is deposited
Frangible the shortcomings that, for acoustic absorptivity 0.4~0.6, sound sucting band is relatively narrow.Polyurethane sound absorption foam, which exists, is unable to high temperature resistant, resistance to
The shortcomings of time property is poor.The processing of microperforated panel structure is simple, without interior filling chock material, enough acoustic resistances is generated by micropore, with cavity shape
Into resonance sound-absorbing structure.But it is limited by processing technology, the aperture of metal microperforated panel is usually in 0.5mm ~ 1mm, individual layer micropunch
The sound sucting band of harden structure is very narrow, is usually no more than 1 octave.The sound sucting band of multilayer microperfrated structure is expanded, but
Typically not greater than 2 octaves.
But for the normal resonant sound absorption structure of single cavity, there is good sound absorbing performance in low frequency, it is necessary to substantially
Degree increases cavity depth, and the scale of construction is often very big.In addition, the sound sucting band of the normal resonant sound absorption structure of single cavity is relatively narrow, it is right
The microperforated panel for being 1mm in aperture, half wide band sound absorption (acoustic absorptivity >=0.5) are typically less than 2 octaves.Absorb sound frequency requirement
It is lower, the thickness of sound absorption structure often require that it is bigger, under the occasion being generally restricted in space, normal resonant sound absorption structure without
Method meets the actual needs of noise abatement well.
For this purpose, the research and design of the good small size novel low-frequency resonance sound-absorbing structure of sound absorbing performance are always acoustics neck
The hot and difficult issue in domain.By depth, in the individual layer perforated microstructure that pseudo-random sequence changes, the period is arranged side by side in one direction, acoustic resistance
Scattering significantly affects the sound absorption characteristics of structure caused by resistanceization.It can cause integrally-built suction in the case of impedance matching
Sonic-frequency band is significantly widened, and effective sound sucting band of more than 0.8 acoustic absorptivity is up to 2 ~ 3 octaves, more than 0.6 effective sound absorption
Frequency band is up to 3 octaves, and peak value is close to 1.0, and middle low frequency absorption performance significantly improves, sound absorbing performance plateau.
Structure processing is simple, and simple installation, without any porous fibre sound-absorbing material, sound absorbing performance is superior.
Invention content
The purpose of this utility model is that propose a kind of ultrabroad band, high acoustic absorption coefficient, device is simple, easy to clean two
Pseudo-random sequence micropunch ultrabroad band sound absorption structure is tieed up, suitable for each occasion for needing noise reduction, the especially noise of below 2KHz.
The utility model proposes bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure, by several closed-cells
The arrangement of cavity 8 obtains, overall structure flush with outer surface, effective cavity depth of two neighboring closed-cell cavity 8 by M sequence or
Both pseudo-random sequences arrangement of remaining secondary sequence, 8 numbers of closed-cell cavity are the length of pseudo-random sequence；Each unit
Closed cavity 8 is connected by micropunch panel 1, front end face 2, rear end face 3, left side 4, right side 5 with unit baseboard 7
Rectangular parallelepiped structure, cell separators 6 are located in closed-cell cavity 8, and closed-cell cavity 8 is separated into several units；It is each single
1 flush with outer surface of micropunch panel of first closed cavity 8, four sides of micropunch panel 1 connect 2 side of front end face, rear end respectively
5 side of 3 side of face, 4 side of left side and right side, 6 side of cell separators connection micropunch panel 1；Four sides of unit baseboard 7
2 side of connection front end face, 5 side of 3 side of rear end face, 4 side of left side and right side respectively, the connection of 6 opposite side of cell separators
Unit baseboard 7；Micropore 9 is distributed on each micropunch panel 1, the area shared by micropore 9 is 1 gross area of micropunch panel
0.5%~4%；The aperture of micropore and perforation field ratio are not random arrangement, according to actual needs optimal setting.
In the utility model, the aperture of micropore 9 is 0.2 ~ 1.2mm.
In the utility model, the distance of micropunch panel 1 to unit baseboard 7 is changed by pseudo-random sequence.
In the utility model, the distance maximum of micropunch panel 1 to unit baseboard 7 is no more than 400mm.
The utility model has the advantages that acoustic absorptivity height, acoustic frequency bandwidth.Frequency range within 150Hz~2KHz
Preferable sound absorbing performance is inside respectively provided with, most of noise sources, the especially middle stronger noise source of low-frequency component, noise can be suitable for
Reducing effect is notable.
Since the sound absorber of the utility model is formed using metal material or nonmetallic materials thin plate punching processing,
With easy processing, easy cleaning, high temperature resistant, and with superior weatherability, can recycle completely, it is entirely avoided traditional fibre
The problem of weatherability existing for material and secondary pollution, has superior environment-friendly function.
Using the utility model simple installation, as long as attaching it to needs the place handled that absorbs sound.
The beneficial effects of the utility model are：
The utility model significantly widens middle low frequency absorption frequency band, low frequency absorption coefficient in raising.Device is simple, and thin type is light
Just, sound absorbing performance is good, simple processing, of low cost, sound sucting band width of the acoustic absorptivity more than 0.8 up to 2 ~ 3 octaves,
More than 0.6 effective sound sucting band is up to 3 octaves, and peak value is close to 1.0, and middle low frequency absorption performance significantly improves, sound absorption
Performance curve is flat widely applicable, easy cleaning, high temperature resistant, and with superior weatherability, can recycle, avoid completely completely
The problem of secondary pollution, has superior environment-friendly function.
Description of the drawings
Fig. 1 is the utility model front view.
Fig. 2 is the utility model section figure.
Fig. 3 is 1 sound absorbing performance of the utility model embodiment.
Figure label：1 is micropunch panel, and 2 be front end face, and 3 be rear end face, and 4 be left side, and 5 be right side, and 6 be single
First partition board, 7 be unit baseboard, and 8 be closed-cell cavity, and 9 be the micropore of micropunch panel.
Specific embodiment
The embodiment of the utility model is further described below by embodiment.
Embodiment 1：Following each component mode as shown in Fig. 1 ~ Fig. 2 is connected, field technology personnel can smoothly implement.
Micropunch panel 1, front end face 2, rear end face 3, left side 4, right side 5, cell separators 6, unit baseboard 7 are connected, and form 7 depths
The closed-cell cavity 8 that degree is distributed by remaining secondary sequence (QRD sequences).Micropunch panel 1 uses the oxidation of 0.6 ~ 0.8mm thickness
Aluminium sheet, size are long 0.4m, wide 0.1m, and the micropore that 2000 ~ 3000 apertures are 0.6 ~ 0.8mm is distributed on micropunch panel 1
9.The distance of micropore panel 1 and unit baseboard 7 is 0cm, 9cmm, 36cm, 18cm, 18cm, 36cm, 9cm.
Front end face 2, rear end face 3, left side 4, right side 5, cell separators 6, unit baseboard 7 use 1mm steel plates.Front end
Face 2 is parallel with rear end face 3, and left side 4 is parallel with right side 5, left side 4 and front end face 2, micropunch panel 1, unit baseboard 7
Vertically.Right side 5 is vertical with front end face 2, micropunch panel 1, unit baseboard 7.
As shown in figure 3, the sound absorbing performance of embodiment 1 150Hz ~ 640Hz be more than 0.8,110Hz ~ 750Hz be 0.6 with
On, peak value is more than 0.9.
Claims (4)
1. bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure, it is characterised in that by several closed-cell cavitys (8)
Arrangement obtains, overall structure flush with outer surface, and effective cavity depth of two neighboring closed-cell cavity (8) by M sequence or remains
Both pseudo-random sequences arrangement of remaining secondary sequence, closed-cell cavity (8) number are the length of pseudo-random sequence；Each unit
Closed cavity (8) is by micropunch panel (1), front end face (2), rear end face (3), left side (4), right side (5) and unit bottom
The connected rectangular parallelepiped structure formed of plate (7), cell separators (6) divide closed-cell cavity 8 in closed-cell cavity (8)
It is divided into several units；Micropunch panel (1) flush with outer surface of each closed-cell cavity (8), four sides of micropunch panel (1)
Front end face (2) side, rear end face (3) side, left side (4) side and right side (5) side, cell separators (6) are connected respectively
Side connection micropunch panel (1)；Four sides of unit baseboard (7) connect front end face (2) side, rear end face (3) side, a left side respectively
End face (4) side and right side (5) side, cell separators (6) opposite side connection unit bottom plate (7)；Each micropunch panel (1)
On micropore (9) is distributed with, the area shared by micropore (9) be micropunch panel (1) gross area 0.5%~4%；The aperture of micropore
It is not random arrangement with perforation field ratio, sets according to actual needs.
2. bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure according to claim 1, it is characterised in that micropore
(9) aperture is 0. 2 ~ 1. 2mm.
3. bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure according to claim 1, it is characterised in that micro- to wear
The distance of hole face plate (1) to unit baseboard (7) is changed by pseudo-random sequence.
4. bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure according to claim 1, it is characterised in that micro- to wear
The distance maximum of hole face plate (1) to unit baseboard (7) is no more than 400mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721511955.9U CN207512628U (en) | 2017-11-14 | 2017-11-14 | Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721511955.9U CN207512628U (en) | 2017-11-14 | 2017-11-14 | Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure |
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| Publication Number | Publication Date |
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| CN207512628U true CN207512628U (en) | 2018-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721511955.9U Expired - Fee Related CN207512628U (en) | 2017-11-14 | 2017-11-14 | Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108374359A (en) * | 2017-11-14 | 2018-08-07 | 同济大学 | Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure |
| CN111636761A (en) * | 2020-06-10 | 2020-09-08 | 湖南大学 | Construction site sound arrester |
-
2017
- 2017-11-14 CN CN201721511955.9U patent/CN207512628U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108374359A (en) * | 2017-11-14 | 2018-08-07 | 同济大学 | Bidimensional pseudo-random sequence micropunch ultrabroad band sound absorption structure |
| CN111636761A (en) * | 2020-06-10 | 2020-09-08 | 湖南大学 | Construction site sound arrester |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180619 Termination date: 20201114 |
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| CF01 | Termination of patent right due to non-payment of annual fee |