CN102646414A - Combined sound absorbing structure based on micropunch and intracavity resonance system - Google Patents
Combined sound absorbing structure based on micropunch and intracavity resonance system Download PDFInfo
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- CN102646414A CN102646414A CN2012101466349A CN201210146634A CN102646414A CN 102646414 A CN102646414 A CN 102646414A CN 2012101466349 A CN2012101466349 A CN 2012101466349A CN 201210146634 A CN201210146634 A CN 201210146634A CN 102646414 A CN102646414 A CN 102646414A
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 44
- 239000006096 absorbing agent Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000011358 absorbing material Substances 0.000 abstract 1
- 238000004080 punching Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
The invention discloses a combined sound absorbing structure based on micropunch and intracavity resonance system. The combined sound absorbing structure comprises a micropunching plate, a cavity and an intracavity resonance system, wherein wider frequency-band sound absorption can be realized by adjusting parameters (plate mass, mechanical resistance and spring stiffness coefficient) of the intracavity resonance system, parameters (hole diameter, plate thickness and punching rate) of the micropunching plate and the depth of the cavity. Compared with the traditional micropunching plate, the sound absorbing material and an active sound absorbing structure, the combined sound absorbing structure disclosed by the invention has the advantages of no energy consumption, cleanness without pollution and obvious low-frequency sound absorbing characteristic.
Description
One, technical field
The present invention relates to a kind of combination sound absorption structure; A kind of method for making of the combination sound absorption structure based on micropunch and chamber systems with internal resonance is proposed; Through the parameter (like dull and stereotyped quality, mechanical resistance, spring stiffness factor) of regulating the chamber systems with internal resonance, the parameter (aperture, thickness of slab, percentage of perforation) and the cavity depth of microperforated panel, can realize the good sound absorption of broad frequency band.
Two, background technology
The development of microperforated absorber had two more than ten years historical, and it is the novel sound absorption structure of a kind of low acoustic mass, high acoustic resistance.Compare with traditional acoustic absorbant, microperforated absorber simple structure, weight are lighter, are suitable for the acoustic propagation pipeline of different gas flow temperatures and gas velocity.The percentage of perforation of microperforated panel is very low, any surface finish, do not receive materials limitations, pollution-free, little to gas-flow resistance, the air-flow regenerated noise is low, is adapted to the situation than high gas flow.When handling the low-frequency range sound absorption, traditional microperforated absorber needs the bigger back of the body chamber degree of depth, in practical application, has certain space constraint.So size that needs to enlarge the sound absorption frequency range and reduce sound absorption structure.In order to improve the low frequency absorption characteristic of sound absorbent perforated structure, (Zhou Hong, Li Bo such as Zhou; Huang Guangsu, He Jia, A novel composite sound absorber with recycled rubber particles; Journal of Sound and Vibration, 2007, Vol 304; 400-406.) improve the low frequency absorption of sound absorbent perforated structure through in sound absorbent perforated structure back of the body chamber, adding PU foam and rubber powder, but the improvement of low frequency absorption performance is limited.CN1805005 discloses a kind of microperforated absorber; This sound absorption structure forms the micro-pore between mesh and the particle; Save the required bore process of microperforated panel, had the dirigibility of adopting one or more absorbent treatment structural unit combinations, adapted to the especially low frequency absorption requirement of various broadbands.CN101373591 discloses a kind of low-frequency sound-absorbing structure of porous material; Comprise the shell of bottom end opening and be installed on shell and lean on the porous sound absorption plate on the inwall of bottom; And seal the opening of shell bottom by a sound transparent layer, this structure is used for fluid, particularly in liquid, absorbs sound.CN101916562A discloses a kind of relief method active and passive hybrid double-layer Absorption System; This system is the passive mixing sound absorption structure of master based on relief method; Through saying that error microphone inserts between the two-layer sound-absorbing porous material and the thickness of optimizing each layer respectively, realized adopting thin acoustic absorbant in broad frequency band, to obtain acoustically effective preferably.The combination sound absorption structure that the present invention's proposition is made up of micropunch and chamber systems with internal resonance; Wherein increase the low frequency absorption characteristic of system through the parameter (dull and stereotyped quality, mechanical resistance, spring stiffness factor) of regulating the chamber systems with internal resonance; Through the parameter (aperture, thickness of slab, percentage of perforation) of adjusting microperforated panel and the medium-high frequency sound absorbing capabilities of cavity depth optimization system, thereby can obtain acoustically effective preferably in broad frequency band; Compare with acoustic absorbant with traditional microperforated panel, compare with structure with the disclosed acoustic absorbant of existing related patent U.S. Patent No., system, the present invention is simple in structure, cleanliness without any pollution, and the low frequency absorption characteristic is obvious.
Three, summary of the invention
The method for making that the purpose of this invention is to provide a kind of combination sound absorption structure based on micropunch and chamber systems with internal resonance; Utilize the good sound-absorbing performance of chamber systems with internal resonance to low-frequency range; Chamber systems with internal resonance and microperforated panel are constituted the combination sound absorption structure; Make that effectively the sound absorption frequency range is widened, the low frequency absorption characteristic is obvious.Compare with traditional microperforated panel, acoustic absorbant and active sound-absorption structure, the present invention does not have energy consumption, simple in structure, cleanliness without any pollution, and the low frequency absorption characteristic is obvious.
The object of the invention is realized through following technical scheme:
Shown in accompanying drawing 1:
A) will be installed on by the chamber internal resonance Absorption System that flat board, damper and spring are formed on the back of the body wall; Microperforated panel and the dull and stereotyped certain distance that keeps; Place dull and stereotyped dead ahead; Sidewall, flat board, microperforated panel form cavity, and sidewall, back of the body wall are used for fixing microperforated panel and chamber internal resonance sound absorption structure respectively;
B) the stiffness factor K of every spring
m=n (2 π f
n)
2M
m, in the formula, K
mRepresent the stiffness factor of every spring, n representes number springs, f
nThe resonant frequency of expression chamber internal resonance Absorption System, M
m=ρ
SS representes dull and stereotyped quality (ρ
SFor platen surface density, S are that platen area is the structure cross-sectional area); Practical application middle plateform surface density ρ
SAs far as possible little, consider real material, desirable 0.1～0.2kg/m
2Dull and stereotyped mass M
mAfter confirming, by dull and stereotyped mass M
mWith resonant frequency f
nCalculate the stiffness factor K of required spring
m, the mechanical resistance value size R of damper
m=ρ
0c
0S;
C) cavity depth is generally got 30～80mm, and 0.05～2mm is generally got in the microperforated panel aperture, and the thickness of microperforated panel is generally got 0.05～2mm, and the frequency range that concrete value absorbs sound according to actual needs can further be optimized.
The invention has the beneficial effects as follows:, can realize the broad frequency band sound absorption through the parameter (dull and stereotyped quality, mechanical resistance, spring stiffness factor) of regulating the chamber systems with internal resonance, the parameter (aperture, thickness of slab, percentage of perforation) and the cavity depth of microperforated panel.
Four, description of drawings
Fig. 1 is the combination sound absorption structure synoptic diagram based on micropunch and chamber systems with internal resonance of the present invention.
Fig. 2 is based on the acoustical absorption coefficient spectrum of the combination sound absorption structure of micropunch and chamber systems with internal resonance.
Five, practical implementation
The present invention will be described with reference to accompanying drawing below by instance:
Combination sound absorption structure synoptic diagram based on micropunch and chamber systems with internal resonance according to the invention is shown in accompanying drawing 1, and the structure xsect is a square, and the length of side is 2cm, and the back of the body chamber degree of depth is 50mm.
The concrete realization operated as follows:
A) the stiffness factor K of every spring
m=n (2 π f
n)
2M
m, in the formula, K
mRepresent the stiffness factor of every spring, n representes number springs, f
nThe resonant frequency of expression chamber internal resonance Absorption System, M
m=ρ
SS representes dull and stereotyped quality (ρ
SFor platen surface density, S are that platen area is the structure cross-sectional area); Practical application middle plateform surface density ρ
SAs far as possible little, consider real material, desirable 0.1～0.2kg/m
2Dull and stereotyped mass M
mAfter confirming, by dull and stereotyped mass M
mWith resonant frequency f
nCalculate the stiffness factor K of required spring
m, the mechanical resistance value size R of damper
m=ρ
0c
0S.It is 0.2kg/m that flat board can be selected surface density
2, thickness is the thin aluminum sheet of 0.1mm, supposes f
n=200Hz, number springs n=4 can obtain spring stiffness factor K
m=505.2N/m, damper mechanical resistance value R
m=0.17Ns/m;
B) microperforated panel can be selected the steel plate of aperture d=0.5mm, thickness of slab t=0.5mm, percentage of perforation σ=0.01, cavity depth D=50mm for use;
The present invention has realized obtaining in the broad frequency band effect of low-frequency sound absorption preferably through the parameter (dull and stereotyped quality, mechanical resistance, spring stiffness factor) of regulating the chamber systems with internal resonance, the parameter (aperture, thickness of slab, percentage of perforation) and the cavity depth of microperforated panel.
Claims (3)
1. combination sound absorption structure based on micropunch and chamber systems with internal resonance is characterized in that:
1. should the combination sound absorption structure form by microperforated panel (1), cavity (2), dull and stereotyped (3), damper (4), spring (5), sidewall (6), back of the body wall (7);
2. the xsect of microperforated panel (1), cavity (2), flat board (3), back of the body wall (7) are square, and sidewall (6) is a rectangle;
3. the spring (5) that some stiffness factors are identical lays respectively at the below of flat board (3), and flat board (3) is linked to each other with back of the body wall (7), and damper (4) is positioned between flat board (3) and the back of the body wall (7), and dull and stereotyped (3), spring (5) and damper (4) are formed chamber internal resonance Absorption System;
4. microperforated panel (1), cavity (2), dull and stereotyped (3) and sidewall (6) are formed microperforated absorber.
2. the stiffness factor K of every spring as claimed in claim 1
m=n (2 π f
n)
2M
m, in the formula, K
mRepresent the stiffness factor of every spring, n representes number springs, f
nThe resonant frequency of expression chamber internal resonance Absorption System, M
m=ρ
SS representes dull and stereotyped quality (ρ
SFor platen surface density, S are that platen area is the structure cross-sectional area); Practical application middle plateform surface density ρ
SAs far as possible little, consider real material, desirable 0.1～0.2kg/m
2Dull and stereotyped mass M
mAfter confirming, by dull and stereotyped mass M
mWith resonant frequency f
nCalculate the stiffness factor K of required spring
m, the mechanical resistance value size R of damper
m=ρ
0c
0S.
3. cavity depth as claimed in claim 1 is generally got 30～80mm, and 0.05～2mm is generally got in the microperforated panel aperture, and the thickness of microperforated panel is generally got 0.05～2mm, and the frequency range that concrete value absorbs sound according to actual needs can further be optimized.
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|---|---|---|---|
| CN2012101466349A CN102646414A (en) | 2012-05-14 | 2012-05-14 | Combined sound absorbing structure based on micropunch and intracavity resonance system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103559877A (en) * | 2013-07-17 | 2014-02-05 | 南京大学 | Composite sound absorption structure based on shunt loudspeaker and micro-perforated plate |
| CN103971671A (en) * | 2014-04-23 | 2014-08-06 | 北京绿创声学工程股份有限公司 | Composite low-frequency resonance sound absorption structure |
| CN104078037A (en) * | 2014-07-11 | 2014-10-01 | 南京大学 | Low-frequency double-resonance sound-absorbing structure and design method thereof |
| CN104167203A (en) * | 2014-08-07 | 2014-11-26 | 四川正升声学科技有限公司 | Broadband sheet type silencer |
| CN107786926A (en) * | 2016-08-29 | 2018-03-09 | 南京大学 | A kind of slim sound absorption structure and its design method for being directed to the low-frequency noise containing multiple single-frequency components |
| CN108932939A (en) * | 2017-05-26 | 2018-12-04 | 南京大学 | It is a kind of to have the slim sound absorption structure and its design method for adjusting noise for low frequency |
| CN109637516A (en) * | 2018-12-24 | 2019-04-16 | 河海大学常州校区 | Inhibit the compound microperforated panel soundabsorbing construction of more cavitys of nonlinear effect under high sound intensity |
| CN110080399A (en) * | 2019-04-26 | 2019-08-02 | 太原理工大学 | A kind of cast-in-place steel wire net rack integration composite sound absorbing device and its application method |
| CN111128106A (en) * | 2019-12-19 | 2020-05-08 | 哈尔滨工程大学 | Underwater low-frequency narrow-band sound insulation structure unit |
| CN112951188A (en) * | 2021-01-28 | 2021-06-11 | 西北工业大学 | Active micro-perforated plate sound absorber and method for improving low-frequency sound absorption performance thereof |
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| US20090223738A1 (en) * | 2008-02-22 | 2009-09-10 | Yamaha Corporation | Sound absorbing structure and vehicle component having sound absorption property |
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2012
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103559877A (en) * | 2013-07-17 | 2014-02-05 | 南京大学 | Composite sound absorption structure based on shunt loudspeaker and micro-perforated plate |
| CN103971671A (en) * | 2014-04-23 | 2014-08-06 | 北京绿创声学工程股份有限公司 | Composite low-frequency resonance sound absorption structure |
| CN103971671B (en) * | 2014-04-23 | 2017-12-26 | 北京绿创声学工程股份有限公司 | A kind of compound low-frequency resonance sound absorption structure |
| CN104078037A (en) * | 2014-07-11 | 2014-10-01 | 南京大学 | Low-frequency double-resonance sound-absorbing structure and design method thereof |
| CN104167203A (en) * | 2014-08-07 | 2014-11-26 | 四川正升声学科技有限公司 | Broadband sheet type silencer |
| CN104167203B (en) * | 2014-08-07 | 2017-12-29 | 正升环境科技股份有限公司 | Broad-band strip-type silencer |
| CN107786926A (en) * | 2016-08-29 | 2018-03-09 | 南京大学 | A kind of slim sound absorption structure and its design method for being directed to the low-frequency noise containing multiple single-frequency components |
| CN107786926B (en) * | 2016-08-29 | 2020-09-08 | 南京大学 | Design method of thin sound absorption structure for low-frequency noise containing multiple single-frequency components |
| CN108932939A (en) * | 2017-05-26 | 2018-12-04 | 南京大学 | It is a kind of to have the slim sound absorption structure and its design method for adjusting noise for low frequency |
| CN109637516A (en) * | 2018-12-24 | 2019-04-16 | 河海大学常州校区 | Inhibit the compound microperforated panel soundabsorbing construction of more cavitys of nonlinear effect under high sound intensity |
| CN110080399A (en) * | 2019-04-26 | 2019-08-02 | 太原理工大学 | A kind of cast-in-place steel wire net rack integration composite sound absorbing device and its application method |
| CN111128106A (en) * | 2019-12-19 | 2020-05-08 | 哈尔滨工程大学 | Underwater low-frequency narrow-band sound insulation structure unit |
| CN111128106B (en) * | 2019-12-19 | 2024-02-20 | 哈尔滨工程大学 | Underwater low-frequency narrow-band sound insulation structure unit |
| CN112951188A (en) * | 2021-01-28 | 2021-06-11 | 西北工业大学 | Active micro-perforated plate sound absorber and method for improving low-frequency sound absorption performance thereof |
| CN112951188B (en) * | 2021-01-28 | 2024-05-03 | 西北工业大学 | Active microperforated panel sound absorber and method for improving low-frequency sound absorption performance thereof |
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Application publication date: 20120822 |