CN109637516B - Multi-cavity composite microperforated panel sound absorption structure for inhibiting nonlinear effect under high sound intensity - Google Patents
Multi-cavity composite microperforated panel sound absorption structure for inhibiting nonlinear effect under high sound intensity Download PDFInfo
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- CN109637516B CN109637516B CN201811581449.6A CN201811581449A CN109637516B CN 109637516 B CN109637516 B CN 109637516B CN 201811581449 A CN201811581449 A CN 201811581449A CN 109637516 B CN109637516 B CN 109637516B
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a multi-cavity composite microperforated panel sound absorption structure for inhibiting nonlinear effect under high sound intensity, which comprises a microperforated panel, a side plate and a backboard; the side plates are vertically and fixedly connected with the rigid back plates to form a plurality of rectangular cavities with one ends open and the other ends closed; at one end of the opening of the cavity, two or more layers of microperforated plates are vertically and fixedly connected with the side plate; the later layer of microperforated panel, the backboard and the side boards jointly enclose a plurality of closed spaces, namely a plurality of resonant cavities; the other layers of microperforated panels, the rear microperforated panel and the side panels also enclose a closed space, but the distance between the microperforated panels is extremely small, so that micro-gaps are formed instead of resonance cavities, and the width of the micro-gaps is generally smaller than 0.2mm. According to the invention, a plurality of resonance absorption peaks are introduced by utilizing a plurality of cavities with different depths, so that a linear broadband sound absorption structure with good nonlinear effect inhibition effect under high sound intensity can be obtained, the thickness increase of the whole structure is small, and the manufacturing cost and the structure weight are low.
Description
Technical Field
The invention relates to a multi-cavity composite microperforated panel sound absorption structure for inhibiting nonlinear effect under high sound intensity, belonging to the sound absorption and noise reduction technology in the noise control field.
Background
Micro-perforated panel (MPP) sound absorption structure is taught in 1975 by well-known acoustic specialist Ma Da in China, and since then, the MPP sound absorption structure is widely applied to various fields of buildings, ships, silencers and the like due to the advantages of firmness, light weight, corrosion resistance, environmental friendliness and the like, and is known as a new generation sound absorption material which can replace the most attractive traditional porous sound absorption material in the 21 st century.
However, in applications with high intensity acoustic fields, such as aero-engines, missile launcher wells, etc., a significant disadvantage of conventional microplates is that their acoustic impedance (including acoustic and acoustic impedance) will depend on the incident sound pressure level, exhibiting strong nonlinear effects. The nonlinear effect not only reduces the sound absorption performance of the microperforated panel, but also causes the problems that an accurate acoustic impedance theoretical model is difficult to establish and the like, thereby greatly limiting the effective application of the microperforated panel under high sound intensity. While the large aspect ratio ultramicropore microperforated sheet structure has the potential to suppress nonlinear effects, the cost of fabrication and the weight of the structure can increase significantly with increasing aspect ratio, clearly detrimental to engineering applications. On the other hand, a significant disadvantage of the conventional microperforated panel sound absorbing structure is that the sound absorbing bandwidth is narrow, typically 1-2 octaves, which is far from adequate as a general sound absorbing structure, which also becomes a bottleneck limiting its practical engineering application. While some improvements may improve the bandwidth of the microperforated panel, such as a double or multi-layer microperforated panel construction, such an approach may result in a significant increase in the thickness of the overall sound absorbing structure and thus may be detrimental to practical engineering applications.
In summary, in the field of noise control, it is needed to find a linear broadband sound absorption structure which can effectively inhibit nonlinear effects and has a wider absorption bandwidth, and the structure is thinner.
Based on the above reasons, the invention provides the linear multi-cavity composite microperforated panel sound absorption structure, which not only can effectively inhibit nonlinear effects under high sound intensity and improve the effective application of the microperforated panel to high sound pressure level, but also can introduce a plurality of resonance absorption peaks, so that the linear multi-cavity composite microperforated panel sound absorption structure has wider sound absorption frequency bandwidth.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a multi-cavity composite microperforated panel sound absorption structure for suppressing nonlinear effects under high sound intensity, which can not only effectively increase the aspect ratio of a microperforated panel and increase the critical sound pressure level under which the nonlinear effects start to act, but also effectively suppress the nonlinear effects, and simultaneously can introduce a plurality of resonance absorption peaks through a plurality of cavities with different depths, thereby widening the sound absorption frequency bandwidth of the microperforated panel. In addition, the thickness of the structure can be made thinner, and the manufacturing cost and the weight of the structure are greatly reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a multi-cavity composite ultramicropore micro-perforated plate structure for inhibiting nonlinear effect under high sound intensity comprises a micro-perforated plate, a side plate and a back plate; the side plates are vertically and fixedly connected with the rigid back plates to form a plurality of rectangular cavities with one ends open and the other ends closed; at one end of the opening of the cavity, vertically and fixedly connecting a plurality of layers of microperforated plates with the side plates; the micro-perforated plates comprise an innermost micro-perforated plate, a plurality of middle micro-perforated plates and an outermost micro-perforated plate; the innermost micro-perforated plate, the backboard and the side plates jointly enclose a plurality of closed spaces to form a plurality of resonant cavities; the innermost microperforated panel, the middle microperforated panel, the outermost microperforated panel and the side panels enclose a plurality of closed spaces to form micro-seams.
The width of the micro-seam is smaller than 0.2mm.
The rectangular cavities are different in depth, and the cavities with different depths are arranged in parallel and separated by side plates.
The through holes of the microperforated panel are round or square, and the diameter of the through holes is between 40 micrometers and 1 millimeter.
By adopting the technical scheme, the invention has the beneficial effects of providing the linear broadband sound absorption structure under high sound intensity, which is specifically expressed in the following steps: 1. by adopting a plurality of cavities with different depths, a plurality of resonance absorption peaks can be introduced, so that the sound absorption bandwidth of the structure is widened. And because different cavities are arranged in parallel, the thickness of the whole structure is not increased obviously. 2. The micro-gaps among the composite multi-layer micro-perforated plates can increase the damping paths of the air flow, so that the length-diameter ratio of the micro-perforated plates is improved, the linear response of the micro-perforated plates under high sound intensity is further enhanced, and compared with the traditional single-layer micro-perforated plate structure with large length-diameter ratio, the weight and the manufacturing cost of the micro-perforated plate structure are greatly reduced, and the micro-perforated plate structure is favorable for practical engineering application.
Drawings
FIG. 1 is a schematic illustration of a multi-cavity composite ultramicropore microperforated panel structure effective to suppress nonlinear effects at high sound intensities;
fig. 2 is a schematic diagram for an actual noise control project.
In FIG. 1, 1. Microperforated panel, 2. Side panels, 3. Rigid back panel, 13. Intermediate microperforated panel, 12. Innermost microperforated panel, 11. Outermost microperforated panel.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1, a multi-cavity composite ultramicropore micro-perforated plate structure for inhibiting nonlinear effect under high sound intensity comprises a micro-perforated plate 1, a side plate 2 and a back plate 3; a plurality of side plates 2 and a plurality of rigid back plates 3 are vertically and fixedly connected to form a plurality of rectangular cavities with one ends open and the other ends closed; at one end of the opening of the cavity, a plurality of layers of microperforated panels 1 are vertically and fixedly connected with a side plate 2; the layers of microperforations 1 comprise an innermost layer of microperforations 12, a number of intermediate layers of microperforations 13 and an outermost layer of microperforations 11; the innermost microperforated panel 12, the backboard 3 and the side plates 2 together enclose a plurality of closed spaces to form a plurality of resonant cavities; the innermost microperforated panel 12, the middle microperforated panel 13, the outermost microperforated panel 11 and the side panels 2 enclose a plurality of closed spaces to form micro-seams.
The width of the micro-seam is smaller than 0.2mm.
The rectangular cavities are different in depth, and the cavities with different depths are arranged in parallel and separated by side plates.
The through holes of the microperforated panel 1 are circular or square, and the diameter of the through holes is between 40 microns and 1 mm.
Example 1:
the invention comprises a microperforated panel 1, a side panel 2 and a back panel 3; the three side plates 2 and the two rigid back plates 3 are vertically and fixedly connected to form two rectangular cavities with one open end and one closed end. At one end of the opening of the cavity, three layers of stainless steel microperforated plates 1 are vertically and fixedly connected with a side plate 2. Structural parameters of three-layer microperforated panels, e.g. pore sizedThickness of platetAnd perforation rateϕThe structural parameters of the microperforations of each layer, in this embodiment, are chosen to be the same, either identically or differently, in particular pore sized=0.06 mm, plate thicknesst=0.6 mm and perforation rateϕ=9.8%. The innermost micro-perforated plate 12, the two back plates 3 and the three side plates 2 together form two closed spaces to form two resonant cavities, the distance from the innermost micro-perforated plate 12 to one of the back plates 31 is 20 mm, and the depth from the innermost micro-perforated plate 12 to the other back plate 32 is 30 mm; the middle microperforated panel 13, the innermost microperforated panel 12 and the side panels 2 also define an enclosed space, but each microperforated panelThe space between the perforated plates 1 needs to be strictly controlled to form micro-slits, rather than resonance cavities, and the width of the micro-slits is preferably 0.1 mm. In this embodiment, since the three-layer microperforated panel adopts a compound structure based on micro-slits, compared with the aspect ratio of a single-layer microperforated panelt/d) Aspect ratio of the entire composite structure>3t/dThe improvement is remarkable, so that the linear response of the composite structure under high sound intensity is greatly improved, and compared with a single layer, the composite structure has the length-diameter ratio of 3t/dThe manufacturing cost of the composite structure is greatly reduced, and the weight of the structure is also smaller. Meanwhile, in the embodiment, as two resonant cavities with different depths are adopted, at least two resonant absorption peaks can be introduced, so that the sound absorption frequency bandwidth of the composite structure can be widened. And because the multiple cavities adopt a parallel structure, the overall thickness of the structure is not greatly increased. In conclusion, the linear broadband sound absorption structure under high sound intensity can be realized with lower manufacturing cost, smaller structure weight and thickness.
When the invention is used, the broadband sound absorption structures shown in the figure 1 can be connected in parallel for use, as shown in the figure 2, and the broadband sound absorption structure is used for actual noise control engineering.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The multi-cavity composite microperforated panel sound absorption structure for inhibiting nonlinear effect under high sound intensity is characterized by comprising a microperforated panel (1), a side plate (2) and a back plate (3); a plurality of side plates (2) and a plurality of rigid back plates (3) are vertically and fixedly connected to form a plurality of rectangular cavities with one ends open and the other ends closed; at one end of the opening of the cavity, a plurality of layers of microperforated panels (1) are vertically and fixedly connected with the side plates (2); the layers of microperforated panels (1) comprise an innermost layer of microperforated panels (12), a plurality of intermediate layer of microperforated panels (13) and an outermost layer of microperforated panels (11); the innermost microperforated panel (12), the backboard (3) and the side plates (2) jointly enclose a plurality of closed spaces to form a plurality of resonant cavities; the innermost layer microperforated panel (12), the middle layer microperforated panel (13), the outermost layer microperforated panel (11) and the side plates (2) enclose a plurality of closed spaces to form micro-seams; the width of the micro-seam is smaller than 0.2mm.
2. The multi-cavity composite microperforated panel sound absorbing structure for inhibiting nonlinear effects at high sound intensities of claim 1, wherein: the rectangular cavities are different in depth, and the cavities with different depths are arranged in parallel and separated by side plates.
3. The multi-cavity composite microperforated panel sound absorbing structure for inhibiting nonlinear effects at high sound intensities of claim 1, wherein: the through holes of the microperforated panel (1) are round or square, and the diameter of the through holes is between 40 micrometers and 1 millimeter.
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| CN102332259B (en) * | 2011-10-12 | 2012-07-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN102646414A (en) * | 2012-05-14 | 2012-08-22 | 南京大学 | Combined sound absorbing structure based on micropunch and intracavity resonance system |
| CN102968985B (en) * | 2012-11-07 | 2015-04-22 | 江苏大学 | Thin broadband sound-absorbing structure of composite multi-layer mechanical impedance 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 |
| CN105427853B (en) * | 2015-10-30 | 2022-09-23 | 东南大学 | Broadband micropunch plate sound absorber and performance prediction method and structure design method thereof |
| CN107039028B (en) * | 2017-06-02 | 2023-06-13 | 郭辰曦 | Performance test method of broadband perforated plate |
| CN207993473U (en) * | 2018-01-24 | 2018-10-19 | 北京万讯达声学设备有限公司 | A kind of micropunch complex muffler |
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