CN203673822U - Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate - Google Patents
Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate Download PDFInfo
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- CN203673822U CN203673822U CN201320858739.7U CN201320858739U CN203673822U CN 203673822 U CN203673822 U CN 203673822U CN 201320858739 U CN201320858739 U CN 201320858739U CN 203673822 U CN203673822 U CN 203673822U
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Abstract
The utility model relates to a wideband sound absorption structure realized through combining mechanical impedance of a composite resonator with a micropunch plate and belongs to the environment noise control technology field. The wideband sound absorption structure comprises one or more layers of micropunch plates at a front portion of the structure, and a mechanical impedance plate at a back portion of the structure, wherein the mechanical impedance plate and the micropunch plates are fixed on a support, the mechanical impedance plate is formed through an elastic supporting thin plate, a composite Helmholtz resonator is compounded on the mechanical impedance plate, and the composite Helmholtz resonator comprises a resonator body and an insertion tube. According to the wideband sound absorption structure, a Helmholtz resonance unit is arranged on the mechanical impedance plate, as thickness of resonators is relatively small respectively, the whole structural thickness has small change. The micropunch plate has an excellent sound absorption effect for medium/high frequency noise, a mechanical impedance unit and the Helmholtz resonance unit can generate multiple absorption peaks under the lower frequency, the whole structure not only can guarantee excellent medium/high frequency sound absorption performance, but also has excellent low frequency sound absorption effects.
Description
Technical field
The utility model relates to the sound absorption technique in field of noise control, the air impedance that is compounded with the mechanical impedance of resonant cavity and be made up of cavity is incorporated into one, feature is in the situation that not increasing sound absorption structure thickness, makes medium, high frequency and low frequency all have good sound-absorbing performance.
Background technology
In noise control engineering, sound absorption technique is a core, and the material of sound absorption is a lot, and traditional hole fibrous material has the shortcoming of secondary pollution.Within 1975, Ma Dayou professor has delivered the article about " theory and design of microperforated panel soundabsorbing construction ", utilize the acoustic resistance of micropunch to absorb sound in conjunction with cavity, its feature is not need to add in addition sound absorption property material, be a kind of sound absorption structure of environmental protection, its application in engineering earns widespread respect.The acoustical absorption coefficient that microperforated panel structure is high occurs near of chamber resonance, mesomerism frequency is mainly determined by the thickness in back of the body chamber, want to obtain good effect of low-frequency sound absorption, microperforated panel structure must be manufactured very thickly, need to occupy a large amount of spaces, this can meet difficulty in Practical Project, and therefore the sound absorbing capabilities of microperforated panel low frequency is not good, becomes the bottleneck of its engineering application of restriction.
At present, in order to improve the low frequency absorption performance of sound absorption structure, some scholars have designed the unitized construction that microperforated panel and acoustic absorbant are combined, but use after acoustic absorbant, structure has the shortcoming of secondary pollution, even so, good at low frequency absorption, the thickness of sound-absorbing material layer is also to need to increase; Application number is that 200920160620.6 utility model will be restrained and slit sound absorption structure composite sound absorbing, but complex structure, manufacturing cost is high, when sound absorbing capabilities moves to low frequency, the length of tube bank needs to increase, the tube bank of growth is held in this volume increase that also requires to carry on the back chamber, and this means that in fact total also wants thickening.These improvement can be moved sound absorption peak value to low frequency to some extent, but can not reach good sound absorbing capabilities at the low frequency needing arbitrarily.Diaphragm structure has certain sound absorbing capabilities at low frequency, but it often only has a resonance peak, has met the sound absorbing capabilities of low frequency, and high frequency acoustically effective is very poor.
Field of noise control, the absorption of noise is crucial, need to have especially a kind of structure gross thickness little, but but can take into account the broad band sound absorption structure of low frequency and medium, high frequency simultaneously, and to environment non-secondary pollution.The utility model just to achieve these goals.
Utility model content
In order to overcome the deficiency of prior art and structure, the broad band sound absorption structure that the mechanical impedance of utility model combinative resonator is combined with microperforated panel.Traditional microperforated panel soundabsorbing construction may be multilayer, but its basic acoustic elements only has two of cavity and micropunch.Sound absorption structure in conjunction with mechanical impedance can form a sound absorption peak in low-frequency range.The utility model has increased Helmholtz resonance unit on the basis of mechanical impedance unit, is different from traditional Helmholtz chamber and is connected in fixed boundary, and in the utility model, Helmholtz resonant cavity is compound on the mechanical impedance plate that can vibrate; Resonant cavity is made up of cavity and intubate, by adjusting resonant cavity volume, number and intubation length, adjustable sound absorption frequency domain, bandwidth and sound absorption peak value.
The new construction of utility model, by the mechanical impedance combination of microperforated panel and combinative resonator, utilizes microperforated panel structure to absorb acoustic energy in middle and high frequency range, and low frequency utilizes mechanical impedance and the Helmholtz resonance absorption acoustic energy of mechanical impedance plate, forms multiple sound absorptions peak.The thickness of structure of the present utility model increases little, but but can meet the sound absorption requirement of medium, high frequency and low frequency simultaneously, is a kind of wide band sound absorption structure.
The broad band sound absorption structure that the mechanical impedance of a kind of combinative resonator of the present utility model is combined with microperforated panel, comprise one or more layers microperforated panel of structure front portion, the mechanical impedance plate at structure rear portion, microperforated panel and mechanical impedance plate are all fixed on support, mechanical impedance plate is formed by the thin plate of resiliency supported, compound Helmholtz resonant cavity on mechanical impedance plate.
Described Helmholtz resonant cavity is made up of cavity and intubate.Change intubation length and can regulate acoustic resistance, play the effect of adjusting sound absorption frequency and peak value.
Be compounded in resonant cavity on mechanical impedance plate one or more, the volume size of each resonant cavity can be identical or not identical, can form multiple absorption peaks.
Mechanical impedance plate is the thin plate with certain sound insulation property, and its border is viscoelastic material, resonant cavity be compound in can vibrating machine impedance plate on.
The high frequency sound absorption part of broad band sound absorption structure is obtained by the microperforated panel in front end, can adopt as required multilayer microperforated panel structure; Mechanical impedance plate adopts the thin plate with certain sound insulation property to be made, and is bonded on Visco-spring Boundary, and design makes the resonant frequency of mechanical impedance system at low frequency; The resonant frequency of Helmholtz resonant cavity also designs at low frequency, but staggers with mechanical impedance resonant frequency.The acoustic energy of low frequency part sees through microperforated panel, act on the mechanical impedance unit of rear end, when mechanical impedance unit is subject to the resonant frequency of acoustic wave excitation and excitation frequency and structure consistent time, system generation mechanical resonance, the viscoelastic material of the mechanical impedance strip moving boundary of vibration vibrates together, consumed energy in this process, plays the effect that absorbs acoustic wave energy.Sound wave departs from the resonant frequency of mechanical impedance unit, consistent with Helmholtz resonant cavity resonant frequency, and generation cavity resonance forms another sound absorption peak.Intubate is controlled sound absorption frequency and acoustical absorption coefficient by adjusting acoustic resistance.Widen the sound sucting band of low frequency part by the resonant cavity of design different volumes.Microperforated panel, mechanical impedance plate and resonant cavity acting in conjunction, form the broad band sound absorption structure that low frequency and medium, high frequency can be taken into account simultaneously.
The utility model is the mechanical impedance unit that adds combinative resonator after the plate of individual layer or multilayer microperforated panel in cavity.The new construction of utility model has following characteristic: (1) resonant cavity and mechanical impedance plate are compound can form multiple sound absorptions peak at low frequency.(2) resonant frequency of resonant cavity can be selected by adjusting resonant cavity parameter.(3), when compound multiple parameters are different on mechanical impedance plate resonant cavity, can form multiple sound absorptions peak.(4) Helmholtz resonant cavity has utilized the space after mechanical impedance plate, just can obtain good acoustically effective at low frequency without the gross thickness that obviously increases sound absorption structure; Medium, high frequency can keep the acoustically effective that original microperforated panel is good, and whole sound absorption structure thickness is little, but acoustic frequency bandwidth.(5) do not use traditional porous sound-absorbing materials such as stringiness due to sound absorption structure, structure still has the characteristic of environmental protection.
accompanying drawing explanation
Fig. 1 is the basic structure schematic diagram of the mechanical impedance of the utility model combinative resonator broad band sound absorption structure embodiment of being combined with microperforated panel.
Fig. 2 is several basic structures sound absorption planes that form in parallel.
The Experimental Comparison figure of sound absorption structure absorption coefficient when Fig. 3 is Helmholtz resonant cavity number difference.Testing equipment is SW002 type standing wave tube, and the parameter of the unit adopting in test is: aluminum microperforated panel, and piercing aperture d=0.8mm, thickness of slab t=0.8mm, percentage of perforation σ=0.03, full board diameter is 100mm; Microperforated panel is to the distance B=40mm of mechanical impedance plate; Elasticity coefficient and the ratio of damping of mechanical impedance system are respectively K=106934N/m, R=5.24Ns/m; The number of plastics resonator is respectively one and five, volume V0=11309mm3, cannula inner diameter d0=2.7mm, length L=4mm.
In accompanying drawing 1,1. wall, 2. support, 3. viscoelasticity circle, 4. resonant cavity, 5. intubate, 6. mechanical impedance plate, 7. microperforated panel a, 8. microperforated panel b
Embodiment
By reference to the accompanying drawings 1 and accompanying drawing 2 implementation method of the present utility model is described.
Accompanying drawing 1 is basic block diagram of the present utility model.Support is arranged on wall 1, and the sheet metal that support 2 is 1mm by thickness is made; Little groove is welded in support 2 sides, adopts whole lap welding to connect; In little groove, lay viscoelasticity circle 3, elastic ring is made by viscoelastic material, and it is shaped as rectangle; On elastic ring, with the bonding mechanical impedance plate of bonding agent, composite machine impedance plate is composited by mechanical impedance plate 6, resonant cavity 4 and intubate 5, and resonant cavity 4 and intubate 5 are connected on mechanical impedance plate 6; Viscoelasticity circle 3 and groove and and impedance plate 6 between require to closely bond, guarantee not leak sound, between mechanical impedance plate 6 and support 2, retain little gap simultaneously, be beneficial to the vibration of composite machine impedance plate, be absorbed into the acoustic energy that is mapped to the low frequency part on mechanical impedance unit; Between resonant cavity 4 and intubate 5 and mechanical impedance plate 6, require closely to connect, guarantee not leak sound, be beneficial to resonant cavity resonance, absorb acoustic energy; Front end is installed microperforated panel a7 and microperforated panel b8, absorbs the acoustic energy of medium, high frequency part, and microperforated panel can be that individual layer can be also multilayer, and other parameters such as its number of plies and aperture are depending on actual requirement of engineering.After having completed the making of basic structure of Fig. 1, by the large sound absorption face (seeing accompanying drawing 2) of formation in parallel several such basic systems, for noise control engineering.
Accompanying drawing 3 is test examples of the present utility model, and in test, front end is placed individual layer microperforated panel, and the emphasis of test is the compound usefulness of explanation resonant cavity and mechanical impedance plate.After combinative resonator, at two sound absorption peak values of low frequency occurrence, produced by mechanical impedance plate and the resonance of Helmholtz resonant cavity respectively; Change after resonant cavity number, sound absorption peak value and bandwidth are all improved.
Claims (7)
1. the broad band sound absorption structure that the mechanical impedance of a combinative resonator is combined with microperforated panel, comprise one or more layers microperforated panel of structure front portion, the mechanical impedance plate at structure rear portion, microperforated panel and mechanical impedance plate are all fixed on support, it is characterized in that, mechanical impedance plate is formed by the thin plate of resiliency supported, compound Helmholtz resonant cavity on mechanical impedance plate.
2. sound absorption structure according to claim 1, is characterized in that Helmholtz resonant cavity is coupled on the mechanical impedance plate that can vibrate.
3. sound absorption structure according to claim 1, is characterized in that, the Helmholtz resonant cavity being compounded on mechanical impedance plate is one.
4. sound absorption structure according to claim 1, is characterized in that, the Helmholtz resonant cavity being compounded on mechanical impedance plate is multiple.
5. sound absorption structure according to claim 4, is characterized in that, the volume size of each resonant cavity is not identical.
6. sound absorption structure according to claim 4, is characterized in that, the volume size of each resonant cavity is identical.
7. sound absorption structure according to claim 1, is characterized in that, in compound Helmholtz resonant cavity, intubate is housed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320858739.7U CN203673822U (en) | 2013-12-24 | 2013-12-24 | Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate |
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| CN201320858739.7U CN203673822U (en) | 2013-12-24 | 2013-12-24 | Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate |
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| CN203673822U true CN203673822U (en) | 2014-06-25 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
| CN105244015A (en) * | 2015-10-22 | 2016-01-13 | 中国船舶重工集团公司第七二四研究所 | Accommodation device with sound absorbing function |
| WO2017187216A1 (en) * | 2016-04-25 | 2017-11-02 | Acoustic Metamaterials Co., Ltd. | Broadband acoustic absorption metamaterials |
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
| CN108425717A (en) * | 2018-03-19 | 2018-08-21 | 浙江师范大学 | A kind of magnetic rheology elastic body muffler used for diesel engine |
| CN108487966A (en) * | 2018-03-19 | 2018-09-04 | 浙江师范大学 | A kind of impedance adjustable formula magnetic rheology elastic body muffler |
| CN108922510A (en) * | 2018-07-18 | 2018-11-30 | 重庆大学 | The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure |
| CN109243421A (en) * | 2018-11-08 | 2019-01-18 | 南京光声超构材料研究院有限公司 | A kind of low-frequency sound-absorbing structure for sqouynd absorption lowering noise |
| CN111199722A (en) * | 2020-01-14 | 2020-05-26 | 南京航空航天大学 | Multilayer composite sound absorption structure |
-
2013
- 2013-12-24 CN CN201320858739.7U patent/CN203673822U/en not_active Withdrawn - After Issue
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
| CN103700366B (en) * | 2013-12-24 | 2016-06-15 | 江苏大学 | The broad band sound absorption structure that the mechanical impedance of combinative resonator is combined with microperforated panel |
| CN105244015A (en) * | 2015-10-22 | 2016-01-13 | 中国船舶重工集团公司第七二四研究所 | Accommodation device with sound absorbing function |
| WO2017187216A1 (en) * | 2016-04-25 | 2017-11-02 | Acoustic Metamaterials Co., Ltd. | Broadband acoustic absorption metamaterials |
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
| CN108425717A (en) * | 2018-03-19 | 2018-08-21 | 浙江师范大学 | A kind of magnetic rheology elastic body muffler used for diesel engine |
| CN108487966A (en) * | 2018-03-19 | 2018-09-04 | 浙江师范大学 | A kind of impedance adjustable formula magnetic rheology elastic body muffler |
| CN108922510A (en) * | 2018-07-18 | 2018-11-30 | 重庆大学 | The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure |
| CN108922510B (en) * | 2018-07-18 | 2023-08-15 | 重庆大学 | Mixed sound absorption structure with porous sound absorption material and resonance structure connected in parallel |
| CN109243421A (en) * | 2018-11-08 | 2019-01-18 | 南京光声超构材料研究院有限公司 | A kind of low-frequency sound-absorbing structure for sqouynd absorption lowering noise |
| CN111199722A (en) * | 2020-01-14 | 2020-05-26 | 南京航空航天大学 | Multilayer composite sound absorption structure |
| CN111199722B (en) * | 2020-01-14 | 2023-12-01 | 南京航空航天大学 | Multilayer composite sound absorption structure |
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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: 20140625 Effective date of abandoning: 20160615 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |