Sound absorption devices and sound absorption systems

Abstract

A sound absorbing device comprises a main body (10), a vibrating member (20) and a mass block (30). The main body has a cavity (12) and an opening. The vibrating member covers the opening to seal the cavity, and comprises an annular connecting portion (22), an annular elastic folding ring (24) and a supporting portion (26). The connecting portion is connected to the edge of the main body surrounding the opening. The elastic folding ring extends along an annular trajectory perpendicular to the direction of use and connects to the inner edge of the connecting portion, and extends from the inside to the outside in a manner of folding back in a direction parallel to the direction of use. The supporting portion is connected to the inner edge of the elastic folding ring. The elastic folding ring can undergo elastic deformation to cause the supporting portion to vibrate. The mass block is fixedly arranged on the supporting portion. The sound absorbing device can achieve the effect of low-frequency resonant sound absorption. The present invention also provides a sound absorbing system.

Description

Technical Field

[0001] The present invention relates to a device for reducing noise, in particular to a sound absorbing device and a sound absorbing system using the sound absorbing device. Background Art

[0002] Traditional low-frequency sound-absorbing devices (sound absorption frequency range below 1000Hz) include open-pored materials, Helmholtz resonators, and plate / membrane resonators. Open-pored material low-frequency sound-absorbing devices use fiber materials such as glass wool, organic foam materials such as sponges, or metal foam materials such as foamed aluminum as sound-absorbing fillers. Their surface is the open-pored material itself or a perforated protective structure, and their overall thickness is relatively large, which takes up more space. Helmholtz resonator-type low-frequency sound-absorbing devices, including traditional Helmholtz resonators and micro-perforated plate structures, require openings or gaps on the surface of the device, resulting in high processing costs. Although plate / membrane resonator-type low-frequency sound-absorbing devices do not require openings on their surface, they have strict requirements on the area of the application environment, have high manufacturing costs, are easily damaged, and are not suitable for use in smaller occasions. Summary of the Invention

[0003] The object of the present invention is to provide a sound absorbing device which is conducive to saving space and production costs and has high structural stability.

[0004] Another object of the present invention is to provide a sound absorbing system, wherein the sound absorbing device thereof is conducive to saving space and manufacturing costs and has high structural stability.

[0005] The present invention provides a sound absorbing device, comprising a main body, a vibrating member and a mass block. The main body has a cavity and an opening connected to the cavity along the direction of use. The vibrating member covers the opening to close the cavity, and comprises an annular connecting portion, an annular elastic folding ring and a supporting portion. The connecting portion extends along an annular trajectory perpendicular to the direction of use, and the connecting portion is connected to the edge of the main body surrounding the opening. The elastic folding ring extends along an annular trajectory perpendicular to the direction of use and connects to the inner edge of the connecting portion, and extends from the inside to the outside in a manner of folding back in a direction parallel to the direction of use. The supporting portion is connected to the inner edge of the elastic folding ring, and the elastic folding ring can undergo elastic deformation to cause the supporting portion to vibrate. The mass block is fixedly arranged on the supporting portion.

[0006] When sound waves strike the surface of the vibrating element, they cause the mass and support to vibrate, manifesting as acoustic mass. The elastic surround provides stiffness and damping, manifesting as acoustic reactance and resistance. The enclosed cavity acts as acoustic capacitance, thereby achieving resonant sound absorption within a certain low-frequency band. This sound-absorbing device boasts a compact structure, saving space and requiring no holes or gaps on its surface, reducing manufacturing costs. Furthermore, the device utilizes the elastic deformation of the elastic surround to achieve vibration, resulting in excellent stability.

[0007] In another exemplary embodiment of the sound-absorbing device, the elastic surround extends from the inside outward in a smooth curve that bends back parallel to the direction of use. By adjusting the shape of this smooth curve and the surround's material, the surround's elasticity and damping value can be adjusted, effectively adjusting the sound absorption bandwidth and peak sound absorption of the entire sound-absorbing device in the low-frequency range.

[0008] In another exemplary embodiment of the sound absorbing device, the elastic fold extends along a circular, elliptical or rounded rectangular trajectory perpendicular to the direction of use.

[0009] In another exemplary embodiment of a sound absorbing device, the main body of the device is provided with a panel having an opening in the center. By adjusting the mass of the panel, the sound absorption bandwidth and peak absorption frequency of the entire sound absorbing device in the low-frequency range can be adjusted. The sound absorption bandwidth and peak absorption frequency can also be adjusted by adjusting the ratio of the support area to the panel area.

[0010] In another exemplary embodiment of the sound absorbing device, the sound absorbing device further comprises a sound absorbing body, which is disposed in the cavity and made of a material having sound absorbing properties. The sound resistance can be adjusted by adding the sound absorbing body.

[0011] In another exemplary embodiment of the sound absorbing device, the sound absorbing body is laid on the inner wall of the main body opposite to the opening along the direction of use, thereby improving the stability of the device.

[0012] In another exemplary embodiment of the sound-absorbing device, the connecting portion is connected to the edge of the main body surrounding the opening via adhesive, and / or the mass is fixed to the supporting portion via adhesive. Adhesive connection facilitates processing. By bonding the connecting portion to the edge of the main body opening, the cavity is sealed, and the sealed cavity acts as a sound container, achieving resonant sound absorption within a certain low-frequency band. By bonding the mass to the supporting portion, when sound waves strike the surface of the vibrating element, the mass and supporting portion vibrate, manifesting as sound mass. Adjusting the size of the mass can adjust the sound mass.

[0013] In another exemplary embodiment of the sound absorbing device, the vibrating element is made of rubber or paper cone, which are low in cost and have good stability.

[0014] The present invention also provides a sound absorption system comprising a plurality of sound absorption devices spaced apart along a plane perpendicular to the direction of use. The sound absorption devices of this system are compact, saving space, and do not require holes or gaps on their surfaces, reducing manufacturing costs. Furthermore, the sound absorption devices utilize the elastic deformation of an elastic fold to achieve vibration, resulting in excellent stability.

[0015] In another exemplary embodiment of the sound absorption system, the system further includes a sound absorption panel, with multiple sound absorption devices embedded in the panel. The panel is made of a fiber material or porous foam. The sound absorption panel absorbs mid- and high-frequency noise (above 1000 Hz), which, combined with the low-frequency sound absorption of the sound absorption devices, achieves broadband sound absorption. The number of sound absorption devices can be increased or decreased to adapt the system to various sizes.

[0016] In another exemplary embodiment of the sound absorption system, the sound absorption system further includes a box body having a back cavity and an installation opening communicating with the back cavity, and the sound absorption panel is covered on the installation opening.

[0017] Compared to existing low-frequency sound absorption devices using open-porous materials, Helmholtz resonators, and plate / membrane resonators, the sound absorption device provided by the present invention can adjust the sound absorption bandwidth and peak value of the entire sound absorption device in the low-frequency band by adjusting the mass of the panel, the elasticity and damping value of the folding ring, and the depth of the cavity individually or in combination, and by adding sound absorbing bodies in the cavity. Compared with existing sound absorption devices, its structure has the characteristics of no perforation structure, no fiber and dust pollution, thin thickness, little impact from airflow, easy processing, low cost, and easy cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are only provided for schematic illustration and explanation of the present invention and are not intended to limit the scope of the present invention.

[0019] Figure 1 is a perspective schematic diagram of an illustrative embodiment of a sound absorbing device;

[0020] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the sound absorbing device shown;

[0021] Figure 3 yes Figure 1 A schematic top view of a vibrating member of the sound absorbing device shown;

[0022] Figure 4 is a structural diagram of an exemplary embodiment in which the elastic fold of the vibrating member extends along a rounded rectangular trajectory perpendicular to the direction of use;

[0023] Figure 5 is a structural diagram of an exemplary embodiment in which the elastic fold of the vibrating member extends along a track perpendicular to the direction of use;

[0024] Figure 6 is a structural diagram of an exemplary embodiment in which the elastic fold of the vibrating member extends along an elliptical trajectory perpendicular to the direction of use;

[0025] Figures 7 to 9 1 is a schematic structural diagram showing three other exemplary embodiments of the elastic fold of the sound absorbing device;

[0026] Figure 10 is a structural diagram of an illustrative embodiment of a sound absorption system;

[0027] Figure 11 It is a sound absorption effect curve diagram when the sound absorption device is provided with panels of different qualities;

[0028] Figure 12 It is a sound absorption effect curve diagram when the sound absorption device is provided with elastic folds of different elasticities;

[0029] Figure 13 It is a sound absorption effect curve diagram when the sound absorption device is provided with elastic folds with different damping values;

[0030] Figure 14 It is a sound absorption effect curve diagram of the cavity of the sound absorption device under two conditions: no sound absorber is added and sound absorber is added;

[0031] Figure 15 It is a sound absorption effect curve diagram when the sound absorption device has different ratios of the support area and the panel area;

[0032] Figure 16 This is a sound absorption effect curve of the sound absorption system when several sound absorption devices are distributed with vertical and horizontal distances of 1 / 5 wavelength and 1 / 10 wavelength of the target sound absorption frequency respectively without adding sound absorption panels;

[0033] Figure 17 This is a sound absorption effect curve of the sound absorption system when sound absorption panels are added and several sound absorption devices are distributed with vertical and horizontal distances of 1 / 5 wavelength and 1 / 10 wavelength of the target sound absorption frequency respectively.

[0034] Description of labels

[0035] 10 Main Body

[0036] 12 cavity

[0037] F Direction of use

[0038] 14 Opening

[0039] 16 panels

[0040] 20 Vibrating parts

[0041] 22 Connection

[0042] 24 elastic folding ring

[0043] 26 Supporting part

[0044] 30 mass blocks

[0045] 40 Sound absorber

[0046] 100 Sound Absorption Device

[0047] 200 Sound Absorption System

[0048] A Layout Plan

[0049] d lateral distance

[0050] d' longitudinal distance

[0051] 210 sound-absorbing panels

[0052] 220 cabinet

[0053] 222 Back Cavity

[0054] 224 Mounting port. DETAILED DESCRIPTION

[0055] In order to have a clearer understanding of the technical features, purposes and effects of the invention, specific embodiments of the present invention are now described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0056] In this document, “illustrative” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “illustrative” should not be interpreted as a more preferred or more advantageous technical solution.

[0057] Figure 1 is a three-dimensional schematic diagram of an exemplary embodiment of a sound absorbing device, Figure 2 yes Figure 1 The cross-sectional view of the sound absorbing device 100 is shown in FIG. Figure 1 and Figure 2 As shown, the sound-absorbing device 100 includes a main body 10, a vibrating member 20, and a mass 30. The main body 10 has a cavity 12 and an opening 14 connected to the cavity 12 along the direction of use F. The vibrating member 20 covers the opening 14 to seal the cavity 12. The vibrating member 20 includes an annular connecting portion 22, an annular elastic fold 24, and a supporting portion 26. The connecting portion 22 extends along a circular path perpendicular to the direction of use F. The connecting portion 22 is connected to the edge of the main body 10 surrounding the opening 14. The elastic fold 24 extends along a circular path perpendicular to the direction of use F and connects to the inner edge of the connecting portion 22. It then extends from the inside outward in a manner that folds back in a direction parallel to the direction of use F. The supporting portion 26 is connected to the inner edge of the elastic fold 24. The elastic fold 24 is capable of elastic deformation to cause the supporting portion 26 to vibrate. The mass 30 is fixedly mounted to the supporting portion 26.

[0058] When sound waves are incident on the surface of the vibrating member 20, the mass block 30 and the supporting portion 26 are caused to vibrate, which manifests as acoustic mass, while the elastic folding ring 24 plays the role of stiffness and damping, which manifests as acoustic reactance and acoustic resistance. The closed cavity 12 plays the role of acoustic capacity, thereby achieving the effect of resonant sound absorption in a certain low-frequency band.

[0059] The sound absorbing device has a compact structure to save space, and does not require holes or gaps to be provided on the surface of the device to reduce manufacturing costs. The sound absorbing device utilizes the elastic deformation of the elastic folding ring to achieve vibration and has good stability.

[0060] like Figure 1 and Figure 2 In the exemplary embodiment shown, a panel 16 is disposed at the top of the main body 10 of the sound absorbing device 100, with an opening 14 disposed in the center. By adjusting the mass of the panel 16, the sound absorption bandwidth and peak absorption frequency of the entire sound absorbing device 100 in the low-frequency range can be adjusted. The sound absorption bandwidth and peak absorption frequency can also be adjusted by adjusting the ratio of the area of the support portion 26 to the area of the panel 16.

[0061] like Figure 2 In the exemplary embodiment shown, the sound absorbing device 100 further includes a sound absorber 40. The sound absorber 40 is disposed within the cavity 12 and is installed on the inner wall of the main body 10 opposite the opening 14 along the direction of use F. The sound absorber 40 is installed at a height lower than the bottom surface of the support portion 26 so as not to affect the vibration of the support portion 26. The sound absorber 40 is made of a damping material with sound-absorbing properties, such as sound-absorbing sponge or sound-absorbing foam, more specifically, melamine sponge and glass wool, but not limited thereto. The installation of the sound absorber 40 can adjust the acoustic impedance.

[0062] In the exemplary embodiment, the connection portion 22 of the sound absorbing device 100 is connected to the edge of the main body 10 surrounding the opening 14 by adhesive bonding or mechanical connection, and the mass block 30 is fixed to the supporting portion 26 by bonding, mechanical connection, or integral molding. The mass block can also be integrated into the supporting portion by integral molding.

[0063] In the exemplary embodiment, the connection portion 22 is bonded to the edge of the opening 14 of the main body 10 using an adhesive, thereby sealing the cavity 12. The sealed cavity 12 acts as a sound container, achieving resonant sound absorption within a certain low-frequency band. By bonding the mass block 30 to the support portion 26, when sound waves strike the surface of the vibrating element 20, the mass block 30 and the support portion 26 vibrate, manifesting as sound mass. Adjusting the size of the mass block 30 can adjust the sound mass.

[0064] The main body 10 of the sound-absorbing device 100 can be made of, but is not limited to, polymer resin, metal, plastic, wood, and glass. The vibrating element 20 can be made of, but is not limited to, rubber and a paper cone. The mass 30 can be made of, but is not limited to, metal, organic materials, and ceramics. By varying the materials of the vibrating element 20, mass 30, and main body 10, the effective bandwidth and peak sound absorption capacity of the device for absorbing low-frequency noise can be adjusted.

[0065] Figure 3 yes Figure 1 Schematic diagram of a top view of the vibrating member of the sound absorbing device shown in FIG. Figure 3 As shown, the elastic fold 24 extends along a circular trajectory perpendicular to the use direction F. In other exemplary embodiments, the extension trajectory of the elastic fold 24 can also be: Figure 4 , the elastic fold 24 extends along a rounded rectangular track perpendicular to the use direction F; Figure 5 , the elastic fold 24 extends along a track perpendicular to the direction of use F; Figure 6 The elastic fold 24 extends along an elliptical path perpendicular to the direction of use F. In other exemplary embodiments, other paths can be designed according to specific sound absorption scenarios. By designing the extension path of the elastic fold 24, the sound absorption device 100 is made beautiful and elegant.

[0066] In other exemplary embodiments, the annular cross-section of the elastic fold 24 (ie Figure 2 The shape of the cross section shown in FIG can also be designed according to the specific sound absorption scenario, as shown in FIG. Figures 7 to 9 Figure 1 shows three other exemplary embodiments of the elastic surround of the sound-absorbing device. By adjusting the shape of the circumferential cross-section of the elastic surround 24 and adjusting the material properties of the elastic surround 24, the elasticity and damping value of the elastic surround 24 can be adjusted, effectively adjusting the sound absorption bandwidth and peak sound absorption value of the entire sound-absorbing device 100 in the low-frequency band.

[0067] Figure 10 It is a structural diagram of a schematic implementation of the sound absorption system. Figure 10 As shown, sound absorption system 200 includes a plurality of sound absorption devices 100. These devices 100 are spaced apart along an arrangement plane A perpendicular to the direction of use F, with a transverse distance d and a longitudinal distance d'. The transverse distance d and the longitudinal distance d' are, for example, equal and equal to 1 / 5 or 1 / 10 of the wavelength of the target sound absorption frequency. This sound absorption system 200 effectively absorbs sound in the low-frequency range. By increasing or decreasing the number of sound absorption devices, the sound absorption system can be applied to various sizes of applications.

[0068] like Figure 10In the illustrated embodiment, the sound absorption system 200 further includes a sound absorption panel 210, onto which several sound absorption devices 100 are embedded. The sound absorption panel 210 is made of a fiber material or a porous foam material. The sound absorption panels 210 absorb mid- and high-frequency noise, which, combined with the low-frequency sound absorption effect of the sound absorption devices 100, achieves broadband sound absorption for the sound absorption system 200. By increasing or decreasing the number of sound absorption devices, the sound absorption system can be applied to various sizes of applications.

[0069] like Figure 10 As shown, in the exemplary embodiment, the sound absorbing system 200 may further include a box body 220. The box body 220 has a back cavity 222 and an installation opening 224 communicating with the back cavity 222. The sound absorbing panel 210 is covered in the installation opening 224.

[0070] The following example illustrates Figure 1 The sound absorption effect of the sound absorbing device having the structure shown and the structural parameters described below.

[0071] Example 1: A main body 10 is made of a polymer resin material, with a thickness of 1.5 mm and a cavity 12 of 50 mm depth. A metal mass 30 with a diameter of approximately 80 mm and a thickness of 1 mm is located in the center of the support portion 26. The connecting portion 22, elastic fold 24, and support portion 26 are made of rubber. No sound absorber is provided. When the sound absorbing device 100 is subjected to vertically incident low-frequency noise, experimental results obtained within the 120-210 Hz range show that the sound absorption coefficient is above 0.5, with a peak value of the sound absorption coefficient approaching 1.0.

[0072] Example 2: Based on Example 1, the depth of the closed cavity 12 is changed to 100 mm. Other parameters and structures are the same as those in Example 1. The experimental results of the sound absorbing device 100 in the range of 70-170 Hz are as follows: the sound absorption coefficient is above 0.5, and the peak value of the sound absorption coefficient is close to 1.0.

[0073] Example 3: Based on Example 1, a 50 mm sound-absorbing sponge was added to the closed cavity. Other parameters and structures were the same as those in Example 1. The experimental results of the sound-absorbing device 100 within the range of 80-210 Hz were as follows: the sound absorption coefficient was above 0.5, and the peak sound absorption coefficient was close to 1.0.

[0074] Example 4: The sound absorbing device 100 has Figure 1 The structure shown in the figure has two types of panels 16: 16-1 and 16-2. The mass of panel 16-1 is greater than that of 16-2. Other parameters and structures are the same. The two types of panels 16 are respectively installed in the sound absorption device. Sound absorption experiments are carried out in the frequency range of 50-1600Hz and the experimental results are compared. Figure 11As shown, when the panel 16 provided in the sound absorbing device 100 is panel 16 - 1 , it exhibits better sound absorption effect in a lower frequency range, that is, when the mass of the panel 16 increases, its sound absorption frequency range moves toward low frequencies, exhibiting better sound absorption effect in the low frequency band.

[0075] Example 5: The sound absorbing device 100 has Figure 1 In the structure shown, there are two types of elastic folds 24: elastic fold 24-1 and elastic fold 24-2. Due to the different materials and / or the shape of the annular cross-section, the elasticity of elastic fold 24-1 is slightly smaller than that of elastic fold 24-2. Other parameters and structures are the same. The vibration member 20 including the elastic folds 24-1 and 24-2 is respectively installed in the sound absorption device 100, and a sound absorption test is carried out in the frequency range of 50-1600Hz and the experimental results are compared. Figure 12 As shown, when the elastic fold 24 provided in the sound absorbing device 100 is the elastic fold 24 - 1 , it exhibits a better sound absorption effect in a lower frequency range, that is, when the elasticity of the elastic fold 24 becomes smaller, its sound absorption frequency range moves toward low frequencies, exhibiting a better sound absorption effect in the low frequency band.

[0076] Example 6: The sound absorbing device 100 has Figure 1 In the structure shown, there are two types of elastic folds 24: elastic fold 24-3 and elastic fold 24-4. Due to the different materials and / or the shape of the annular cross-section, the damping value of elastic fold 24-3 is greater than that of elastic fold 24-4. Other parameters and structures are the same. The vibration member 20 including the elastic fold 24-3 and the elastic fold 24-4 is respectively installed in the sound absorption device 100, and a sound absorption test is carried out in the frequency range of 50-1600Hz and the experimental results are compared. Figure 13 As shown, when the elastic fold 24 provided in the sound absorbing device 100 is the elastic fold 24 - 3 , its sound absorption frequency range increases but the sound absorption peak value decreases, that is, when the damping value of the elastic fold 24 increases, its sound absorption frequency bandwidth becomes wider but the sound absorption peak value decreases.

[0077] Example 7: The sound absorbing device 100 has Figure 1 The structure shown in the figure is used, and the sound absorber 40 is not set, and a sound absorption experiment is carried out in the frequency range of 50-1600 Hz. After the experiment is completed, the sound absorber 40 is set in its cavity 12, and the sound absorption experiment is carried out under the same experimental conditions and the experimental results are compared with the experimental results without the sound absorber. Figure 14 As shown, after the sound absorbing body 40 is provided, the sound absorption frequency range of the sound absorbing device 100 moves toward high frequencies, the sound absorption bandwidth becomes narrower, but the sound absorption peak value increases.

[0078] Example 8: The sound absorbing device 100 has Figure 1The structure shown in FIG. 1 includes two types of supporting parts 26: supporting part 26-1 and supporting part 26-2. The area of supporting part 26-1 is smaller than that of supporting part 26-2. Other parameters and structures are the same. The vibration member 20 including supporting part 26-1 and supporting part 26-2 is respectively installed on the sound absorbing device 100. Figure 15 As shown, when the supporting portion 26 of the sound absorbing device 100 is the supporting portion 26 - 2 , it has a sound absorption effect in a higher sound absorption frequency range, the sound absorption bandwidth does not change much, but the sound absorption peak value is improved. That is, when the ratio of the area of the supporting portion 26 to the area of the panel 16 increases, the sound absorption frequency range of the sound absorbing device 100 moves toward high frequencies, the sound absorption bandwidth does not change much, but the sound absorption peak value is improved.

[0079] Example 9: Multiple sound absorbing devices 100 are connected to Figure 10 The sound absorption system 200 is formed by distributing the sound absorption panels 210 in the manner shown. In the frequency range of 0-5000 Hz, the sound absorption effects are measured when the lateral distance d and the longitudinal distance d' are both 1 / 5 wavelength of the target sound absorption frequency and when both are 1 / 10 wavelength of the target sound absorption frequency. Figure 16 As shown, when the sound absorbing device 100 is installed with both the lateral distance d and the longitudinal distance d' being 1 / 10 of the wavelength of the target sound absorption frequency, its sound absorption peaks at 100 Hz, 125 Hz, and 160 Hz are greater than those when the sound absorbing device 100 is installed with both the lateral distance d and the longitudinal distance d' being 1 / 5 of the wavelength of the target sound absorption frequency. In the mid- and high-frequency bands, the sound absorbing system 200 has almost no sound absorption performance.

[0080] Example 10: Multiple sound absorbing devices 100 are connected to Figure 10 The sound absorption system 200 is formed by distributing the sound absorption panels 210 in the manner shown. In the frequency range of 0-5000 Hz, the sound absorption effects are measured when the lateral distance d and the longitudinal distance d' are both 1 / 5 wavelength of the target sound absorption frequency and when both are 1 / 10 wavelength of the target sound absorption frequency. Figure 17 As shown, when the sound absorbing device 100 is installed with both the lateral distance d and the longitudinal distance d' equal to 1 / 10 of the wavelength of the target sound absorption frequency, its sound absorption peaks at 100 Hz and 125 Hz are greater than when the device is installed with both the lateral distance d and the longitudinal distance d' equal to 1 / 5 of the wavelength of the target sound absorption frequency. At 160 Hz, the sound absorption peak of the sound absorbing system 200 changes dramatically due to the influence of other sound absorbing bodies. In the mid- and high-frequency ranges, the sound absorption coefficient of the sound absorbing system 200 fluctuates around 1.0.

[0081] In this article, acoustic impedance is the sound pressure level at a point divided by the volume velocity of the propagation medium at that point. Generally speaking, this is a complex number, with its real part called acoustic resistance and its imaginary part called acoustic reactance, analogous to electrical impedance in electricity. Acoustic resistance represents the transmission and loss of sound energy, while acoustic reactance represents the amount of sound energy not consumed but stored in the medium. The sources of acoustic reactance can be divided into two categories: analogous to inductance and capacitance in electricity, acoustic mass corresponds to inductance. The most common example is the air inside a short tube. When the tube length is much smaller than the wavelength of the sound wave, the air vibrations within the tube are assumed to be uniform, and the air within the entire tube moves like a piston. The mass of this piston is called acoustic mass. Acoustic capacitance corresponds to capacitance. The most common example is a closed cavity. When the air within the cavity is subjected to external sound pressure disturbances, the air pressure inside the cavity changes because the cavity walls are rigid relative to the air, exerting an opposing force on the outside, much like a spring. It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0082] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sound absorbing device comprising: A main body (10) having a cavity (12) and an opening (14) connected to the cavity (12) along a use direction (F); Characterized in that, the sound absorbing device further comprises: A vibrating member (20) covers the opening (14) to close the cavity (12), the vibrating member (20) comprising: an annular connecting portion (22) extending along an annular trajectory perpendicular to the use direction (F), the connecting portion (22) being connected to an edge of the main body (10) surrounding the opening (14), an annular elastic fold (24) extending along an annular trajectory perpendicular to the use direction (F) and connected to the inner edge of the connecting portion (22), the elastic fold (24) extending from the inside to the outside in a manner of folding back in a direction parallel to the use direction (F), and a supporting portion (26) connected to the inner edge of the elastic folding ring (24), wherein the elastic folding ring (24) is capable of elastic deformation to allow the supporting portion (26) to vibrate; and A mass block (30) is fixedly disposed on the supporting portion (26).

2. The sound absorbing device according to claim 1, wherein The elastic folding ring (24) extends from the inside to the outside in a smooth curve that folds back in a direction parallel to the use direction (F).

3. The sound absorbing device according to claim 1, wherein The elastic folding ring (24) extends along a circular, elliptical or rounded rectangular trajectory perpendicular to the use direction (F).

4. The sound absorbing device according to claim 1, wherein The main body (10) is provided with a panel (16), and the opening (14) is provided at the center of the panel (16).

5. The sound absorbing device according to claim 1, wherein The sound absorbing device further comprises a sound absorbing body (40), which is arranged in the cavity (12); the sound absorbing body (40) is made of a material having sound absorbing properties.

6. The sound absorbing device according to claim 5, wherein: The sound absorber (40) is laid on the inner wall of the main body (10) opposite to the opening (14) along the use direction (F).

7. The sound absorbing device according to claim 1, wherein The material of the vibration member (20) is rubber or a paper cone.

8. Sound absorption system, characterized in that, The device comprises a plurality of sound absorbing devices according to any one of claims 1 to 7, wherein the plurality of sound absorbing devices are arranged at intervals along an arrangement plane (A) perpendicular to the use direction (F).

9. The sound absorbing system according to claim 8, wherein: The sound absorption system further comprises a sound absorption plate (210), a plurality of the sound absorption devices are embedded in the sound absorption plate (210), and the sound absorption plate (210) is made of a fiber material or a porous foam material.

10. The sound absorbing system according to claim 9, wherein: The sound absorption system further comprises a box body (220), the box body (220) having a back cavity (222) and a mounting opening (224) communicating with the back cavity, and the sound absorption panel (210) is covered on the mounting opening (224).

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