CN110838281A - Multi-cavity sandwich type micro-perforated plate noise elimination structure - Google Patents
Multi-cavity sandwich type micro-perforated plate noise elimination structure Download PDFInfo
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- CN110838281A CN110838281A CN201910964086.2A CN201910964086A CN110838281A CN 110838281 A CN110838281 A CN 110838281A CN 201910964086 A CN201910964086 A CN 201910964086A CN 110838281 A CN110838281 A CN 110838281A
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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
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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Abstract
The invention discloses a multi-cavity sandwich type micro-perforated plate noise elimination structure which comprises a micro-perforated plate, wherein the micro-perforated plate is of a cylindrical structure, a shell is arranged outside the micro-perforated plate, a resonant cavity of an annular structure is formed between the shell and the micro-perforated plate, a plurality of partition plates are radially arranged between the shell and the micro-perforated plate at intervals, the partition plates divide the resonant cavity into a plurality of small resonant cavities with the same size, a sandwich plate is arranged in each small resonant cavity along the circumferential direction of the micro-perforated plate, a closed inner cavity is formed among the sandwich plate, the partition plates and the shell, a closed outer cavity is formed among the sandwich plate, the partition plates and the shell. The micro-perforated sound-absorbing structure has sound-absorbing performance of medium-low and medium-high frequency bands and good structural mechanical property, and is a multifunctional integrated structure of mechanical bearing and broadband sound absorption.
Description
Technical Field
The invention belongs to the technical field of broadband noise elimination, and particularly relates to a multi-cavity sandwich type micro-perforated plate noise elimination structure.
Background
The micropunch plate is a novel sound absorption structure, compared with a sound absorption structure made of a traditional resistive sound absorption material, the micropunch plate does not need any porous sound absorption material, only a large number of micropores are formed in a thin metal plate, the pore diameter of each micropore is 0.5-1 mm, the perforation rate is 1% -5%, and a cavity with a certain depth is formed after perforation. The absorption frequency band is different according to needs, and when absorbing low frequency, intermediate frequency, high frequency, the cavity size is 150 ~ 200mm, 80 ~ 120mm, 30 ~ 50mm in proper order. In order to obtain a broadband high absorption effect, a double-layer micro-perforated plate structure is generally adopted. The double-layer micro-perforated plate structure has the characteristics of high sound absorption coefficient, wide noise elimination frequency band, high temperature resistance, oil resistance, water resistance, fire resistance, corrosion resistance and the like, and is widely applied to noise elimination projects of gas turbine exhaust, blower exhaust and the like at present. However, the sound absorption coefficient and the sound attenuation frequency band of the double-layer micro-perforated plate structure in the middle and high frequency bands are far inferior to those in the middle and low frequency bands, and the sound absorption and noise reduction of the middle and low frequency bands and the middle and high frequency bands cannot be realized at the same time.
The existing micropunch plate is only connected with the shell through two ends of the micropunch plate, the structural strength and rigidity of the micropunch plate are poor, structural vibration can be generated when the micropunch plate is impacted by high-speed high-pressure airflow, and the structure is easily damaged. And this microperforated panel silencer is double-deck microperforated panel structure, and its noise elimination effect at the well high frequency channel is relatively poor. Although the micro-perforated plate silencer has the characteristics of high sound absorption coefficient and the like, the micro-perforated plate silencer has the following problems in practical engineering application:
(1) the structural strength is insufficient, and the vibration is generated under the impact of high-speed and high-pressure airflow, so that the structural damage is easily caused;
(2) the noise elimination and reduction capability in the middle and high frequency range is insufficient.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a multi-cavity sandwich type micro-perforated plate silencing structure aiming at the defects in the prior art, and solve the problems of insufficient structural strength and insufficient silencing capability of medium and high frequency bands of the existing micro-perforated plate silencing structure.
The invention adopts the following technical scheme:
the utility model provides a multicavity intermediate layer formula microperforated panel noise-abatement structure, including the microperforated panel, the microperforated panel is the cylinder structure, the outside is provided with the shell, be the resonant cavity of loop configuration between shell and the microperforated panel, radial interval is provided with a plurality of baffles between shell and the microperforated panel, the baffle separates the resonant cavity into a plurality of little resonant cavities that the size is the same, every little resonant cavity is provided with the sandwich panel along microperforated panel circumference, form confined inner chamber between sandwich panel and baffle and the microperforated panel, form confined exocoel between sandwich panel and baffle and the shell, flange joint is passed through at the both ends of shell and.
Specifically, the baffle includes 3 at least, and the thickness is 1 ~ 2 mm.
Specifically, the sandwich plate comprises two types which are provided with micro-perforation or not provided with perforation treatment, and the two types of sandwich plates are arranged at intervals.
Furthermore, the clapboard of the sandwich plate which is not perforated is provided with micro-perforations corresponding to the outer cavity.
Furthermore, the opening area of the micro-perforation on the separator is smaller than or equal to that of the adjacent sandwich plate.
Furthermore, the thickness of the sandwich plate is 0.2-2 mm, and the thickness of the sandwich plate which is not perforated is smaller than that of the sandwich plate which is provided with the micro-perforations.
Further, the micro-perforated plate is opened the micro-perforation on the sandwich panel that has the micro-perforation and the baffle and is square range to evenly distributed, the micro-perforated plate, it is different with the micro-perforation aperture of baffle to open the sandwich panel that has the micro-perforation, and the aperture is 0.4 ~ 1 mm.
Furthermore, the perforation rate of the micro-perforated plate is 0.3 to 0.5 percent greater than that of the sandwich plate and the clapboard with the micro-perforated holes, and the maximum perforation rate is less than or equal to 5 percent.
Specifically, the thickness of the micro-perforated plate is 0.2-2 mm, and the thickness of the shell is 2-3 mm.
Specifically, the cavity depth of the resonant cavity is 20 to 500 mm.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a multi-cavity sandwich type micro-perforated plate noise elimination structure, which is based on a micro-perforated plate structure, wherein a baffle plate is utilized to divide an annular cavity formed by a micro-perforated plate and a shell into a plurality of small cavities, the mechanical property of the structure is improved, the small cavities are divided into an inner cavity and an outer cavity by a sandwich plate penetrated with micro-perforations, and the inner cavity and the outer cavity form a double-layer micro-perforated plate structure together with the micro-perforated plate. The sandwich plate without perforation and the micro-perforated plate form a single-layer micro-perforated plate structure, the partition plate part participating in forming the closed outer cavity is subjected to micro-perforation, the outer cavity behind the sandwich plate without perforation and the outer cavity behind the sandwich plate with micro-perforations are communicated, the noise reduction performance is enhanced, and in order to facilitate the structure to be connected with an air duct, flange interfaces are arranged at two ends of the shell.
Furthermore, in order to ensure that the structure has stable mechanical properties, the number of the longitudinal partition plates is at least 3, in order to ensure that the structure has enough rigidity in the transverse direction, the plate thickness of each partition plate is set to be 1-2 mm, and the thicknesses of the longitudinal partition plates are the same.
Furthermore, in order to form a single-layer and double-layer micro-perforated plate structure, micro-perforations are arranged on the sandwich plate or not, and the sandwich plate with the micro-perforations and the sandwich plate without the micro-perforations are distributed at intervals.
Furthermore, in order to connect the outer cavity behind the sandwich plate without perforation treatment and the outer cavity behind the sandwich plate with micro perforation in series to enhance the noise reduction performance, the partition plate part of the outer cavity behind the sandwich plate without perforation treatment is perforated, and the opening area does not exceed the adjacent sandwich plate.
Furthermore, in order to realize broadband sound absorption, the cavity depth of the annular resonant cavity between the micro-perforated plate and the shell is 20-500mm, and the cavity depth of the single-layer micro-perforated plate structure is adjusted to enable the resonant frequency to fall in a middle-high frequency band, so that the defect of the sound absorption capability of the double-layer micro-perforated plate structure in the middle-high frequency band is overcome.
Furthermore, in order to ensure the sound absorption effect of the sandwich plate with the micro-perforated holes, the thickness range of the sandwich plate is 0.2-2 mm, and in order to reduce the structure weight, the thickness of the sandwich plate without the perforation treatment can be smaller than that of the sandwich plate with the micro-perforated holes.
Further, in order to guarantee the sound absorption effect of microperforated panel structure, the microperforated panel sets up to 0.4 ~ 1mm with the microperforated aperture scope on wearing the sandwich panel of microperforation, it is even to perforate the distribution, the hole is square arrangement, and according to the actual demand, microperforated panel and baffle, the microperforated aperture on wearing the sandwich panel of microperforation can be inequality, in order to optimize the design structure, the perforation rate on the microperforated panel is greater than the baffle and opens the perforation rate on the sandwich panel that has microperforation 0.3% ~ 0.5%, the biggest perforation rate is no longer than 5%.
Further, in order to guarantee the sound absorption effect of microperforated panel, the thickness range of microperforated panel sets up to 0.2 ~ 2mm, and in order to guarantee the holistic intensity of structure and rigidity, shell thickness sets up to 2 ~ 3 mm.
In conclusion, the micro-perforated sound attenuation structure has sound absorption performance of medium-low and medium-high frequency bands and good structural mechanical property, and is a multifunctional integrated structure of mechanical bearing and broadband sound absorption.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is an exploded schematic view of the sound absorbing structure of the present invention;
FIG. 2 is a cross-sectional view of a sound absorbing structure of the present invention;
FIG. 3 is a schematic diagram of transmission loss in the range of 100 to 3000Hz for three embodiments of the present invention.
Wherein: 1. a housing; 2. a partition plate; 3. a sandwich panel; 4. a micro-perforated plate; 5. and (4) a flange.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "left", "right", "inside", "outside", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a multi-cavity sandwich type micro-perforated plate noise elimination structure which is a broadband noise elimination structure consisting of a shell, a partition plate, a sandwich plate and a micro-perforated plate. The partition board has the main functions of enhancing the strength and rigidity of the sound absorption board, forming a multi-cavity structure and facilitating the sound absorption design of each cavity. The sandwich plate with the micro-perforated holes mainly has the function of forming a double-layer micro-perforated plate structure, so that the sound absorption capacity of the medium and low frequency bands is improved. The sandwich plate without perforation treatment mainly has the function of forming a single-layer micro-perforated plate structure, and the sound absorption capacity of the structure in a middle and high frequency range is improved by designing the cavity depth and other parameters.
Referring to fig. 1 and 2, the multi-cavity sandwich-type micro-perforated plate muffling structure of the present invention includes a housing 1 and a micro-perforated plate 4 disposed inside the housing 1. The shell 1 and the microperforated panel 4 are cylindric and set up with one heart, and the annular resonant cavity that forms between shell 1 and the microperforated panel 4 is vertically run through by baffle 2, evenly divide into a plurality of little resonant cavities, and the width of each baffle 2 distributes along the direction of radius of shell 1, and each little resonant cavity size is the same, and little resonant cavity is separated into inner chamber and exocoel by sandwich panel 3, and sandwich panel 3 is circular-arc and is concentric setting with shell 1. The micro-perforated plate 4, the sandwich plate 3 and the clapboard 2 form a closed inner cavity; the sandwich plate 3, the shell 1 and the baffle plate 2 form a closed outer cavity.
The number of partitions 2 depends on the actual requirements, but is at least 3; the sandwich plate 3 is provided with micro-perforations or not perforated, and the two types of sandwich plates are distributed at intervals.
The part of the partition wall 2 of the outer chamber behind the unperforated sandwich panel 3 is perforated with microperforations not exceeding the area of the openings of the adjacent sandwich panel 3.
The cavity depth of the annular resonant cavity between the shell 1 and the micro-perforated plate 4 is 20-500 mm; the thickness of each partition plate 2 is the same and is 1-2 mm; the thickness of the micro-perforated plate 4 is 0.2-2 mm; the thickness of the shell 1 is 2-3 mm.
The thickness range of sandwich panel 3 is 0.2 ~ 2mm, and the thickness of sandwich panel 3 of not doing the perforation processing is less than the sandwich panel 3 thickness that has opened the micro-perforation.
The micro-perforated plate 4 is provided with micro-perforated sandwich plates 3, the aperture of the micro-perforated sandwich plates is different from that of the partition plate 2, the aperture is 0.4-1 mm, the perforation distribution is uniform, the holes are arranged in a square mode, the perforation rate of the micro-perforated plate 4 is 0.3% -0.5% larger than that of the micro-perforated sandwich plates 3 and the partition plate 2, and the maximum perforation rate is not more than 5%.
Fixed through gluing between shell 1, microperforated panel 4, baffle 2 and the sandwich panel 3, guarantee the stability of the inside mechanical properties of structure, it is fixed through gluing between shell, microperforated panel, baffle and the sandwich panel.
And two ends of the shell 1 are provided with interfaces 5 of flanges for connecting an air duct.
In practical application, a plurality of multi-cavity sandwich-type micro-perforated plate noise elimination structures can be connected in series and separated by annular partition plates, so that the noise elimination performance is improved.
Preferably, referring to fig. 1, the silencing structure of the multi-cavity sandwich-type micro-perforated plate with 8 partition plates is formed by connecting two multi-cavity sandwich-type micro-perforated plate silencing structures in series.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The acoustic performance of the invention is estimated by using a finite element method, and the technical scheme of the invention is exemplarily described by examples in specific applications.
The materials used in the examples were as follows:
air: it is characterized by a density of 1.29kg/m3Dynamic viscosity coefficient of 1.82X 10-5kg/m.s, sound velocity 343 m/s.
Structural dimensions of the examples:
example 1
Two multi-cavity sandwich type micro-perforated plate noise elimination structures are connected in series and have the same structural parameters, the thickness of the micro-perforated plate is 0.45mm, the perforation diameter is 0.4mm, the perforation rate is 4%, the thickness of a sandwich plate with micro-perforations is 0.7mm, the diameter of the micro-perforations is 0.4mm, the thickness of a sandwich plate without perforation treatment is 0.4mm, the thickness of a shell is 2mm, the thickness of a partition plate is 1.5mm, the number of the partition plates is 6, the perforation rate of a partition plate area with micro-perforations is 4%, the perforation diameter is 0.7mm, the diameter of the micro-perforated plate is 40mm, the cavity depth of an annular resonant cavity between the shell and the micro-perforated plate is 60mm, the curvature radiuses of 4 sandwich plates with micro-perforations are respectively 55mm, 55mm, 60mm and 60mm, the curvature radiuses of 2 sandwich plates without perforation treatment are respectively 50mm and 50mm, and the length of a single noise.
Example 2
The other parameters are unchanged, only the number of the partition plates is changed to 8, the curvature radiuses of the 6 sandwich plates with the micro-perforations are respectively 50mm, 50mm, 55mm, 55mm, 60mm and 60mm, and the curvature radiuses of the 2 sandwich plates without the micro-perforations are respectively 50mm and 50 mm.
Example 3
The other parameters are unchanged, only the number of the partition plates is changed to 10, the curvature radiuses of the 8 sandwich plates with the micro-perforations are respectively 45mm, 45mm, 50mm, 50mm, 55mm, 55mm, 60mm and 60mm, and the curvature radiuses of the 2 sandwich plates without the micro-perforations are respectively 50mm and 50 mm.
Numerical simulations using the materials and structural dimensions described above gave the following results for the examples:
please refer to fig. 3, which is a schematic diagram of transmission loss of three embodiments of a multi-cavity sandwich-type micro-perforated plate muffling structure in the range of 100 to 3000 Hz.
As can be seen from the graph, the average transmission loss in the range of 100 to 1500Hz and the average transmission loss in the range of 1500 to 3000Hz in example 1 are 23.3dB and 24.7dB, respectively.
In example 2, the average transmission loss at 100 to 1500Hz was 24.6dB, and the average transmission loss at 1500 to 3000Hz was 22.1 dB.
In example 3, the average transmission loss at 100 to 1500Hz was 25.0dB, and the average transmission loss at 1500 to 3000Hz was 19.6 dB.
From the viewpoint of average transmission loss, the transmission loss of the middle and high frequency band of example 1 reaches 24.7dB, and the sound absorption performance of the middle and high frequency band is optimal. The difference value of the average transmission loss of the middle-low frequency band and the middle-high frequency band is controlled within 6dB by the three embodiments.
According to the data, the technical effects achieved by the invention are as follows:
1. the simulation model with the structure length of 100mm of the test piece has the advantages that the average transmission loss can reach 24.7dB in the middle-high frequency range of 1500-3000 Hz, the sound absorption performance of the middle-high frequency range is equivalent to that of the middle-low frequency range, and the sound absorption and noise reduction performance is excellent.
2. The invention has strong performance designability, can flexibly change the number of the partition plates of the structure according to the sound absorption and noise reduction requirements of different frequency bands, and designs the structural parameters of the sandwich plate in each small cavity so as to meet the specific sound absorption and noise reduction requirements;
3. in the invention, the annular cavity is divided into a plurality of small cavities by using the partition plates, so that the mechanical property of the structure is improved, and the capability of the structure for resisting high-speed and high-pressure airflow impact is improved;
according to the characteristics of the multi-cavity sandwich type micro-perforation noise elimination structure, the multi-cavity sandwich type micro-perforation noise elimination structure can be used for designing pipeline noise elimination, such as pipelines of an industrial gas turbine, an exhaust channel and the like, the requirements of pipeline sound absorption and noise reduction are met, the multi-cavity sandwich type micro-perforation noise elimination structure has a wide engineering application prospect, and a brand new solution is provided for the noise elimination design and the airflow impact resistance design which are in consideration of medium-low and medium-high frequency bands in the engineering structure.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a multicavity intermediate layer formula microperforated panel noise-abatement structure, a serial communication port, including microperforated panel (4), microperforated panel (4) are the cylinder structure, the outside is provided with shell (1), be the resonant cavity of loop configuration between shell (1) and microperforated panel (4), radial interval is provided with a plurality of baffles (2) between shell (1) and microperforated panel (4), baffle (2) separate into the resonant cavity a plurality of little resonant cavities that the size is the same, be provided with sandwich panel (3) along microperforated panel (4) circumference in every little resonant cavity, form confined inner chamber between sandwich panel (3) and baffle (2) and microperforated panel (4), form confined exocoel between sandwich panel (3) and baffle (2) and shell (1), the both ends of shell (1) and microperforated panel (4) are passed through flange (5) and are connected.
2. A multi-cavity sandwich-type micro-perforated plate muffling structure according to claim 1, wherein the partition plates (2) comprise at least 3 partition plates and have a thickness of 1-2 mm.
3. A multi-cavity sandwich microperforated panel sound-damping structure as claimed in claim 1, characterized in that the sandwich panels (3) comprise two types, with or without microperforations, the two types of sandwich panels (3) being spaced apart.
4. A multi-chamber sandwich microperforated panel sound-damping structure as claimed in claim 3, characterized in that the non-perforated sandwich panel (3) is provided with microperforations in correspondence of the partition (2) of the outer chamber.
5. A multi-chamber sandwich microperforated panel sound-damping structure as claimed in claim 4, characterized in that the open area of the microperforations in the partition (2) is less than or equal to the open area of the adjacent sandwich panel (3).
6. A multi-cavity sandwich-type micro-perforated plate sound attenuation structure according to claim 3, characterized in that the thickness of the sandwich plate (3) is 0.2-2 mm, and the thickness of the sandwich plate (3) without perforation is smaller than the thickness of the sandwich plate (3) with micro-perforations.
7. A multi-cavity sandwich-type micro-perforated plate muffling structure according to claim 3, wherein the micro-perforated plates (4) are arranged in a square shape with micro-perforated sandwich plates (3) and micro-perforated holes on the partition plates (2) and are uniformly distributed, and the micro-perforated plates (4) are different from the micro-perforated plates (3) and the partition plates (2) in pore diameter, and the pore diameter is 0.4-1 mm.
8. A multi-cavity sandwich microperforated panel sound-damping structure as claimed in claim 7, characterized in that the perforation rate on the microperforated panel (4) is 0.3% to 0.5% greater than the perforation rate on the microperforated sandwich panel (3) and partition (2), the maximum perforation rate being equal to or less than 5%.
9. A multi-cavity sandwich-type micro-perforated plate muffling structure according to claim 1, wherein the micro-perforated plate (4) has a thickness of 0.2 to 2mm, and the housing (1) has a thickness of 2 to 3 mm.
10. The multi-cavity sandwich-type micro-perforated plate muffling structure of claim 1, wherein the cavity depth of the resonant cavity is 20-500 mm.
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| IT202100002015A1 (en) * | 2021-02-01 | 2021-05-01 | Aprea Vincenzo | OPTIMIZED SOUND-INSULATION DEVICE |
| CN113123261A (en) * | 2021-05-12 | 2021-07-16 | 中南大学 | Bionic sound absorption structure based on conch cavity structure and sound absorption unit plate thereof |
| CN113427439A (en) * | 2021-07-26 | 2021-09-24 | 瑞安市金诺汽配有限公司 | Nail shooting device convenient for slag discharge |
| CN113793586A (en) * | 2021-08-24 | 2021-12-14 | 武汉理工大学 | Low-frequency ultra-wideband acoustic black hole acoustic material structure |
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