CN202996287U - Thin broadband sound-absorbing structure compounded with multi layers of mechanical impedance plates - Google Patents
Thin broadband sound-absorbing structure compounded with multi layers of mechanical impedance plates Download PDFInfo
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- CN202996287U CN202996287U CN 201220580702 CN201220580702U CN202996287U CN 202996287 U CN202996287 U CN 202996287U CN 201220580702 CN201220580702 CN 201220580702 CN 201220580702 U CN201220580702 U CN 201220580702U CN 202996287 U CN202996287 U CN 202996287U
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- mechanical impedance
- backboard
- sound absorption
- absorbing
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Abstract
The utility model provides a thin broadband sound-absorbing structure, comprising sound-absorbing material and a bracket, and further comprising at least two layers of mechanical impedance plates, wherein the sound-absorbing material is arranged at the inner side of one end of the bracket, a supporting plate is arranged on the inner wall of the other end of the bracket, each mechanical impedance plate is composed of a back plate and viscoelastic rings at two ends of the back plate, adjacent back plates are not contacted with each other, the viscoelastic rings are adhered on the supporting plate by adhesives, the viscoelastic rings, the inner wall of the bracket and the back plates are tightly adhered with one another, a cavity is formed among the sound-absorbing material and the mechanical impedance plates, and the outermost back plate is recessed towards the end face of the bracket by a certain distance. According to the thin broadband sound-absorbing structure, mechanical impedance is coupled to a traditional sound-absorbing material and a cavity resonance absorption mechanism to form a novel thin broadband sound-absorbing mechanism, the structure thickness is not increased basically based on the acoustic performance, the middle/high-frequency sound absorption performance is good, and meanwhile, the low-frequency sound absorption effect is improved greatly, so that the sound-absorbing structure of which the thickness is thin and the sound-absorbing frequency band is wide is produced.
Description
Technical field
The utility model relates to sound absorber, with the novel sound absorption structure that mechanical impedance and traditional acoustic absorbant combine, belongs to the technical field of environmental noise abatement.
Background technology
In the acoustic absorbant and microperforated panel soundabsorbing construction of traditional porous material class, the acoustic absorbant of glass wool, mineral cotton, rock wool, polyfoam, asbestos wool, felt, softboard is arranged.Usually, acoustic absorbant (structure) has good middle and high sound absorbing capabilities, and the low frequency absorption performance is not good; The microperforated panel structure is utilized the resonance in chamber, in the limited space situation, exists equally the low frequency absorption performance not good; Film sound absorption structure and thin plate sound absorption structure only absorb sound near resonant frequency, and sound sucting band is narrow.In order to improve effect of low-frequency sound absorption, often need thickened material (structure) or thick air layer is set rearward, its sound absorption characteristics curve map 5 (a) and (b).Under the occasion that strictly is restricted of sound absorption space, as in fields such as industrial machinery, household appliances, vehicle and power, want to realize that the wideband noise control that comprises low-frequency noise just seems that some is unable to do what one wishes.
The present invention just for these reasons, proposition is in conjunction with the slim broad band sound absorption structure of multilayer mechanical impedance plate, the multilayer mechanical impedance is incorporated in traditional acoustic absorbant (structure), utilize the absorption of vibrations low-frequency noise of multilayer mechanical impedance plate, high-frequency noises is still absorbed by traditional acoustic absorbant (structure).Coupling multilayer mechanical impedance in traditional acoustic absorbant and chamber resonance sound-absorbing mechanism, total can accomplish to take into account simultaneously the sound absorption requirement of basic, normal, high frequency, and thickness can be done thinlyyer.
Summary of the invention
In the situation that cavity apart from keeping less, still has good broad band sound absorption effect, invented the slim broad band sound absorption structure in conjunction with multilayer mechanical impedance plate in order to solve.
The slim broad band sound absorption structure of composite multi-layer mechanical impedance described in the utility model comprises acoustic absorbant and support, also comprises two-layer at least mechanical impedance plate; Described acoustic absorbant is arranged on the inboard of support one end; The inwall of the support other end is provided with supporting plate, and the mechanical impedance plate is comprised of the viscoelasticity circle at backboard and backboard two ends; Adjacent backboard does not contact; The viscoelasticity circle is bonded on supporting plate with bonding agent, closely bonds between viscoelasticity circle, rack inner wall and backboard; Form a cavity between acoustic absorbant and mechanical impedance plate, outermost backboard is to the recessed certain distance of bracket end face.
Sound absorption structure described in such scheme is sound-absorbing porous material or microperforated panel chamber resonant structure.Can there be armour layer on described sound-absorbing porous material surface.
Backboard described in such scheme is sheet metal or non-metal board, not perforation on backboard.
The slim broad band sound absorption structure of composite multi-layer mechanical impedance plate of the present invention, in novel sound absorption structure, acoustic absorbant can be acoustic absorbant and the microperforated panel soundabsorbing construction of porous material class, according to Practical Project being required to select corresponding acoustic absorbant (structure).The HFS acoustic energy of incident acoustic wave dissipates in acoustic absorbant or microperforated panel structure; Low frequency part causes the resonance of mechanical system, is not perforation on multilayer mechanical impedance plate, after sound wave incides the plate face, can effectively excite the mechanical vibration of thin plate near resonance zone, and acoustic energy dissipates in the viscous on border.By the number of plies of choose reasonable mechanical impedance plate and rigidity and the viscous damping coefficient of quality and viscoelastic material, a plurality of resonance sound-absorbing peak values of medium and low frequency place's generation are effectively widened sound sucting band.From sound absorbing mechanism, no matter be microperforated panel or acoustic absorbant, obtain good low frequency absorption, all need to make the thickness of structure and material to increase.And the new construction that the present invention proposes combines mechanical impedance and air impedance, has brought in idea variation to what acoustic absorbant improved low-frequency effect.Only need to change the material behavior of elastic boundary, select the high material of softness factor, just can obtain good sound absorption at low frequency, need not to increase sound absorption structure thickness.On traditional concept, to obtain wide band sound absorption at low frequency, intermediate frequency and high frequency simultaneously, the thickness of its structure is necessarily higher, new this structure that proposes has broken through this idea, and the slim broad band sound absorption structure of composite multi-layer mechanical impedance also can realize having simultaneously good sound absorption function at basic, normal, high frequency.
Description of drawings
Fig. 1 and Fig. 2 be the present invention in conjunction with the basic structure schematic diagram of the slim broad band sound absorption structure embodiment of mechanical impedance, wherein Fig. 1 tradition sound absorption structure is the acoustic absorbant of porous material class, Fig. 2 tradition sound absorption structure is microperforated panel soundabsorbing construction.
Fig. 3 is respectively Fig. 1 several structures corresponding with Fig. 2 sound absorption floor map that form in parallel with Fig. 4.
Fig. 5 is the sound absorption characteristics curve of acoustic absorbant and resonance sound-absorbing structure.(a) sound absorption characteristics of acoustic absorbant, (b) sound absorption characteristics of microperforated panel structure.
Fig. 6 means the normal incident absorption coefficient of slim broad band sound absorption structure of the present invention
αWith frequency
fThe calculated results.Wherein Fig. 6 sound absorption structure is take three layers of microperforated panel structure as example, and impedance plate is three layers of backboard that lay viscoelastic material.
Embodiment
Accompanying drawing 1 is basic block diagram of the present invention, and 1. acoustic absorbants in figure can be glass wool, mineral cotton, rock wool, polyfoam, asbestos wool, felt etc., 2. support, 3. cavity, 4. supporting plate, 5. viscoelasticity circle, 6. wall, 7. cavity, 8 backboards.As shown in Figure 1, the sound absorption structure of inventing is comprised of support 2, acoustic absorbant (structure) 1 and multilayer mechanical impedance plate, and wherein the mechanical impedance plate is comprised of backboard 8 and viscoelasticity circle 5.Acoustic absorbant (structure), the front end that is installed on described support 2 is inboard, and wherein the sound-absorbing porous material surface can be to lay the armour layer that fabric, punch cover panel, film, cover net and riband etc. do not affect the acoustic absorbant sound absorbing capabilities.The mechanical impedance plate is installed on the inwall of support 2, by at support 2 soldering pallets, on the viscoelasticity circle 5 bonding supporting plates of use bonding agent, requires to closely bond between viscoelasticity circle 5, support 2 inwalls and backboard, guarantees not leak sound.Viscoelasticity circle 5 is made by viscoelastic material, and it is shaped as rectangle.Form a cavity 3 between acoustic absorbant (structure) 1 and mechanical impedance plate, also form cavity 5 between mechanical impedance plate 5 and wall 6.Elastic ring one end and mechanical impedance plate are bonding, the other end and supporting plate or other impedance plate are bonding, the viscoelasticity circle has been not only bonding effect, viscoelastic material has the character of elasticity and sticking damping concurrently, has certain internal loss, portion of energy dissipates because the interior friction of material becomes heat energy when its stress deformation, plays sound absorption.Between backboard and elastic ring will with bonding agent bonding, do not need bonding agent between backboard because be not direct-connected between backboard, backboard and backboard are combined by the viscoelasticity circle, leave the gap between backboard.
Accompanying drawing 2 is another kind of structural representations of embodiment of the present invention, and wherein traditional sound absorption structure is the multilayer microperforated panel soundabsorbing construction.Fig. 3 is respectively Fig. 1 several structures corresponding with Fig. 2 large sound absorption floor map that form in parallel with Fig. 4.
Accompanying drawing 5 is sound absorption characteristics curves of acoustic absorbant and resonance sound-absorbing structure, illustrates by Fig. 5, and acoustic absorbant in the past and structure want to obtain good low frequency absorption performance, and the thickness of structure and material is increased.
Claims (4)
1. the slim broad band sound absorption structure of a composite multi-layer mechanical impedance, comprise acoustic absorbant and support, characterized by further comprising two-layer at least mechanical impedance plate; Described acoustic absorbant is arranged on the inboard of support one end; The inwall of the support other end is provided with supporting plate, and the mechanical impedance plate is comprised of the viscoelasticity circle at backboard and backboard two ends; Adjacent backboard does not contact; The viscoelasticity circle is bonded on supporting plate with bonding agent, closely bonds between viscoelasticity circle, rack inner wall and backboard; Form a cavity between acoustic absorbant and mechanical impedance plate, outermost backboard is to the recessed certain distance of bracket end face.
2. the slim broad band sound absorption structure of composite multi-layer mechanical impedance according to claim 1 is characterized in that described sound absorption structure is sound-absorbing porous material or microperforated panel chamber resonant structure.
3. the slim broad band sound absorption structure of composite multi-layer mechanical impedance according to claim 2 is characterized in that there is armour layer on described sound-absorbing porous material surface.
4. the slim broad band sound absorption structure of composite multi-layer mechanical impedance according to claim 1, is characterized in that backboard is sheet metal or non-metal board, not perforation on backboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220580702 CN202996287U (en) | 2012-11-07 | 2012-11-07 | Thin broadband sound-absorbing structure compounded with multi layers of mechanical impedance plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220580702 CN202996287U (en) | 2012-11-07 | 2012-11-07 | Thin broadband sound-absorbing structure compounded with multi layers of mechanical impedance plates |
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| CN202996287U true CN202996287U (en) | 2013-06-12 |
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| CN 201220580702 Withdrawn - After Issue CN202996287U (en) | 2012-11-07 | 2012-11-07 | Thin broadband sound-absorbing structure compounded with multi layers of mechanical impedance plates |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968985A (en) * | 2012-11-07 | 2013-03-13 | 江苏大学 | Thin broadband sound-absorbing structure of composite multi-layer mechanical impedance plates |
| 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 |
| CN109346050A (en) * | 2018-09-17 | 2019-02-15 | 南京邮电大学 | A kind of wide frequency acoustic absorber with folding space |
-
2012
- 2012-11-07 CN CN 201220580702 patent/CN202996287U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968985A (en) * | 2012-11-07 | 2013-03-13 | 江苏大学 | Thin broadband sound-absorbing structure of composite multi-layer mechanical impedance plates |
| 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 |
| CN109346050A (en) * | 2018-09-17 | 2019-02-15 | 南京邮电大学 | A kind of wide frequency acoustic absorber with folding space |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130612 Effective date of abandoning: 20150422 |