Rubber cell element structure and vibration reduction and sound insulation assembly

Abstract

The embodiment of the invention relates to the technical field of devices for preventing or reducing noise, in particular to a rubber cell element structure and a vibration reduction and sound insulation assembly. According to the rubber cell element structure provided by the invention, due to the fact that the resonant frequencies of the cell element rings with different sizes are different, each first cell element ring is arranged in each second cell element ring, and the first cell element rings and the second cell element rings are concentrically arranged, so that vibration and noise reduction of noise with different frequencies are realized; a plurality of first cell element rings and a plurality of second cell element rings are arranged on a substrate, the substrate is supported by the cell element rings, the second cell element rings are arranged adjacent to one another, the cell element rings are arranged in a limited space as many as possible, and therefore the supporting performance of the substrate is improved; the first cell element ring and the second cell element ring are arranged to be of a structure capable of generating the local resonance effect to form the band gap, so that transmission of vibration noise in the structure is restrained, the restraining capacity of the structure for multi-band noise is improved, and the treatment requirement for different-frequency noise is comprehensively met.

Description

Technical Field

[0001] The embodiments of this application relate to the technical field of devices for preventing or reducing noise, and more specifically to a rubber cell structure and a vibration damping and sound insulation component. Background Technology

[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.

[0003] The pursuit of lightweight and high-speed in equipment such as aerospace, marine vessels, and high-speed trains has exacerbated the vibration and noise problems in the cabin environment, directly affecting cabin comfort and equipment reliability.

[0004] Existing technologies for vibration reduction and noise reduction in cabin environments typically employ methods such as designing reinforcing ribs to increase stiffness or constraining damping layers, and laying porous sound insulation materials to absorb sound. However, this approach has drawbacks such as a narrow applicable frequency band, making it difficult to cope with broadband noise under complex operating conditions, thus making it difficult to effectively meet the needs for vibration reduction and noise reduction in cabin environments. Summary of the Invention

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] In a first aspect, embodiments of this application provide a rubber cell structure, comprising: a substrate, a plurality of first cell rings, and a plurality of second cell rings. Each first cell ring is disposed inside each second cell ring and is concentrically arranged, with each second cell ring arranged adjacent to each other; the plurality of first cell rings and the plurality of second cell rings are disposed on the substrate; wherein the first cell rings and the second cell rings are configured in a structural form capable of generating a local resonance effect.

[0007] Secondly, embodiments of this application also provide a vibration damping and sound insulation component, which includes the rubber cell structure provided in any embodiment of this application.

[0008] The rubber cell structure provided in the embodiments of this application, due to the different resonant frequencies of cell rings of different sizes, achieves vibration reduction and noise reduction for different frequencies by setting each of the multiple first cell rings within each of the multiple second cell rings concentrically; by setting the multiple first cell rings and multiple second cell rings on the substrate to support the substrate using the cell rings, and arranging each second cell ring adjacent to each other to set as many cell rings as possible in a limited space, thereby improving the support performance for the substrate; and by setting the first cell rings and second cell rings into a structural form that can generate a local resonance effect to form a band gap, thereby suppressing the propagation of vibration noise in the structure, effectively improving the structure's ability to suppress multi-band noise, and comprehensively covering the needs for noise control at different frequencies. Attached Figure Description

[0009] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0010] Figure 1 This is a schematic diagram of a rubber cell structure according to an embodiment of this application; Figure 2 This is a cross-sectional view of a vibration damping and sound insulation component according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a vibration damping and sound insulation component according to an embodiment of this application; Figure 4 This is a cross-sectional view of a support fixing layer according to an embodiment of this application.

[0011] Explanation of reference numerals in the attached figures: 10. Base; 20. First cell ring; 30. Second cell ring; 100. Rubber cell structure; 200. Sound-absorbing material layer; 300. Covering layer; 400. Support and fixing layer; 410. Constraint layer; 420. Fixing layer.

[0012] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0013] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0014] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0015] The inventors of this application have discovered that, in response to the need for vibration reduction and noise reduction in cabin environments, the structures used in related technologies have relatively weak ability to suppress multi-frequency noise, making it difficult to cover the needs for noise control at different frequencies.

[0016] Based on this, embodiments of this application provide a rubber cell structure, such as... Figure 1 As shown, Figure 1 The diagram illustrates a structural schematic of a rubber cell structure according to an embodiment of this application. The rubber cell structure includes a substrate 10, a plurality of first cell rings 20, and a plurality of second cell rings 30. Each first cell ring 20 is disposed within each second cell ring 30 and is concentrically arranged, with each second cell ring 30 arranged adjacent to each other. The plurality of first cell rings 20 and the plurality of second cell rings 30 are disposed on the substrate 10. The first cell rings 20 and the second cell rings 30 are configured to produce a local resonance effect.

[0017] The rubber cell structure provided in the embodiments of this application, due to the different resonant frequencies of cell rings of different sizes, achieves vibration reduction and noise reduction for different frequencies by setting each first cell ring 20 inside each second cell ring 30 concentrically; by setting multiple first cell rings 20 and multiple second cell rings 30 on the base 10 to support the base 10, and arranging each second cell ring 30 adjacent to each other to set as many cell rings as possible in a limited space, thereby improving the support performance for the base 10; and by setting the first cell rings 20 and second cell rings 30 into a structure capable of generating a local resonance effect to form a band gap, thereby suppressing the propagation of vibration noise in the structure, effectively improving the structure's ability to suppress multi-frequency noise, and comprehensively covering the needs for noise control at different frequencies.

[0018] In some embodiments, the radius of the first cell ring 20 may be determined as follows: determining the expected resonant frequency; determining the Young's modulus, Poisson's ratio, areal density, and thickness of the materials of the first cell ring 20 and the second cell ring 30; and determining the radius of the first cell ring 20 based on the resonant frequency, the Young's modulus, Poisson's ratio, areal density, and thickness of the materials of the first cell ring 20 and the second cell ring 30.

[0019] In this embodiment, based on the determined resonance frequency, the Young's modulus, Poisson's ratio, areal density, and thickness of the materials of the first cell ring 20 and the second cell ring 30, the radius of the first cell ring 20 is determined so that the rubber cell structure can reach the expected resonance frequency, which is consistent with the frequency range that needs to be targeted for noise reduction. Thus, multiple band gaps are constructed to effectively suppress the propagation of multi-band noise in the structure, which is conducive to achieving broadband vibration reduction and noise reduction.

[0020] In some embodiments, the resonant frequency, the Young's modulus of the materials of the first cell ring and the second cell ring, the Poisson's ratio of the first cell ring and the second cell ring, the areal density of the first cell ring and the second cell ring, the thickness of the first cell ring and the second cell ring, and the radius of the first cell ring 20 conform to the following relationship: .

[0021] In the formula Let be the Young's modulus of the materials of the first and second cell rings. Poisson's ratio of the first cell ring and the second cell ring The areal density of the first cell ring and the second cell ring The thicknesses of the first cell ring and the second cell ring are given. These are coefficients determined based on experience. The resonant frequency, The radius of the first cell ring 20.

[0022] The relationship can improve the accuracy of the radius of the first cell ring 20 determined based on the determined resonant frequency, the Young's modulus, Poisson's ratio, areal density, and thickness of the materials of the first cell ring 20 and the second cell ring 30, thereby further improving the ability of the rubber cell structure to suppress multi-band noise.

[0023] In some embodiments, the radius of the second cell ring 30 can be determined based on the radius of the first cell ring 20. In this embodiment, the radius of the second cell ring 30 is determined by the radius of the first cell ring 20, so that the first cell ring 20 and the second cell ring 30 form a structure capable of generating a local resonance effect, which is beneficial for forming multiple band gaps. This effectively suppresses the propagation of vibration noise of different frequencies in the structure and further improves the structure's ability to suppress multi-band noise.

[0024] In some embodiments, the radius of the first cell ring 20 and the radius of the second cell ring 30 conform to the following relationship: .

[0025] In the formula, Let be the Young's modulus of the materials of the first and second cell rings. Poisson's ratio of the first cell ring and the second cell ring The areal density of the first cell ring and the second cell ring The thicknesses of the first cell ring and the second cell ring are given. The radius of the first cell ring 20, The radius of the second cell ring 30, This is the resonant frequency.

[0026] The relationship can improve the accuracy of the radius of the second cell ring 30 determined based on the radius of the first cell ring 20, thereby significantly enhancing the local resonance effect obtained by the first cell ring 20 and the second cell ring 30, and thus improving the ability of the rubber cell structure to suppress the propagation of noise at different frequencies.

[0027] Embodiments of this application also provide a vibration damping and sound insulation component, which includes a multilayer rubber cell structure 100 provided in any embodiment of this application. Please refer to... Figure 2 , Figure 2 A cross-sectional view of a vibration damping and sound insulation component according to an embodiment of this application is shown.

[0028] Vibration and noise in the cabin environment mainly include noise transmitted into the cabin from external noise sources (such as engines and other equipment) through the air medium, i.e., airborne noise, and noise radiated into the cabin by vibration, i.e., structural noise. In related technologies, the structural materials used to achieve vibration and noise reduction in the cabin environment often have low damping and poor broadband vibration and noise reduction capabilities, making it difficult to achieve joint control of airborne noise and structural noise.

[0029] For the above issues, please refer to Figure 2 and Figure 3 , Figure 3 The diagram illustrates the structure of a vibration damping and sound insulation component according to one embodiment of this application. In some embodiments of this application, the vibration damping and sound insulation component may further include: a sound-absorbing material layer 200, a covering layer 300, and a support and fixing layer 400. The sound-absorbing material layer 200 is disposed between the rubber cell structures 100, the covering layer 300 covers the outside of the rubber cell structures 100, and the support and fixing layer 400 is disposed outside the covering layer 300 for connection with the external object to be vibration damped and sound-insulated.

[0030] In this embodiment, by placing the sound-absorbing material layer 200 between the rubber cell structures 100, the local resonance effect generated by the rubber cell structures 100 suppresses noise propagation when airborne and structural noise is transmitted to the vibration damping and sound insulation component. The sound-absorbing material layer 200 further absorbs noise, thereby enhancing the ability to suppress noise propagation. By covering the rubber cell structures 100 with the covering layer 300, the rubber cell structures 100 are provided with protective covering to ensure that they do not warp or peel off during use. At the same time, the covering layer 300 provides flame retardant and isolation protection for the rubber cell structures 100, ensuring structural integrity during use. By placing the support and fixing layer 400 outside the covering layer 300 and connecting it to the external object to be vibration damped and sound-insulated, vibration is dissipated, enhancing the vibration damping effect. Thus, the broadband vibration damping and noise reduction effect of the vibration damping and sound insulation component is significantly improved, achieving joint control of airborne and structural noise.

[0031] In addition, the number of layers of the rubber cell structure 100 and the sound-absorbing material layer 200 between every two layers of rubber cell structure 100 can be set according to the required thickness or space constraints, so that the vibration damping and sound insulation component has the characteristic of being able to flexibly adjust the thickness.

[0032] In some embodiments, a plurality of first cell rings 20 and a plurality of second cell rings 30 are disposed on one side facing the sound-absorbing material layer 200 and are fitted into the sound-absorbing material layer 200 so that the sound-absorbing material layer 200 can further absorb noise.

[0033] In some embodiments, the sound-absorbing material layer 200 may be configured to complement the vibration reduction and noise reduction frequency band of the rubber cell structure 100, so that noise not suppressed by the rubber cell structure 100 can be suppressed by the sound-absorbing material layer 200, thereby further improving the vibration reduction and noise reduction effect of the vibration reduction and sound insulation component.

[0034] Specifically, the multilayer rubber cell structure 100 can generate a local resonance effect in the mid-to-low frequency band, thereby creating a band gap in the mid-to-low frequency band and effectively suppressing the propagation of mid-to-low frequency vibration noise. By setting the sound-absorbing material layer 200 to complement the vibration reduction and noise reduction frequency band of the rubber cell structure 100, the residual high-frequency noise outside the band gap of the rubber cell structure 100 can be dissipated by the sound-absorbing material layer 200, thereby further suppressing noise propagation.

[0035] In some embodiments, the acoustic impedance of the sound-absorbing material layer 200 can be determined as follows: the absorption coefficient of the sound-absorbing material layer 200 is determined based on the frequency of the rubber cell structure 100; the characteristic impedance of air is determined; and the acoustic impedance of the sound-absorbing material layer 200 is determined based on the absorption coefficient and the characteristic impedance of air.

[0036] In this embodiment, the absorption coefficient of the sound-absorbing material layer 200 is determined based on the frequency of the rubber cell structure 100, and the acoustic impedance of the sound-absorbing material layer 200 is determined based on the absorption coefficient and the characteristic impedance of air, so that the sound-absorbing material layer 200 with the acoustic impedance can complement the vibration reduction and noise reduction frequency band of the rubber cell structure 100.

[0037] In some embodiments, the frequency, absorption coefficient, characteristic impedance, and acoustic impedance of the rubber cell structure 100 conform to the following relationship: .

[0038] In the formula, The acoustic impedance of the 200mm sound-absorbing material layer is... Let f be the characteristic impedance of air, and f be the frequency of the rubber cell structure at 100 Hz. is the absorption coefficient of the sound-absorbing material layer 200.

[0039] The relationship can improve the accuracy of the acoustic impedance of the sound-absorbing material layer 200 determined based on the absorption coefficient and the characteristic impedance of air. As a result, the sound-absorbing material layer 200 and the rubber cell structure 100 complement each other better in the vibration reduction and noise reduction frequency bands, which is conducive to further covering the vibration reduction and noise reduction of multi-frequency noise, and significantly improving the broadband vibration reduction and noise reduction effect of the vibration reduction and sound insulation component.

[0040] Based on typical sound-absorbing material layer models, such as the Johnson-Champoux-Allard (JCA / JCAL) semi-empirical microscopic model, the acoustic impedance of sound-absorbing material layer 200 can be determined. The expression is: , In the formula, Angular frequency, For effective density, For effective bulk modulus.

[0041] Furthermore, and The expressions are as follows: , , In the formula, This is the static air density. For viscosity, Specific heat ratio of gases It is static pressure. Thermal conductivity, For isobaric specific heat, Porosity of the material The flow resistance of the material, For the deflection of the material, The viscous characteristic length of the material, The thermal characteristic length of the material, ω is the angular frequency, and j is the imaginary unit.

[0042] In some embodiments, the rubber cell structure 100 may be made of a compounded silicone rubber material, which can maintain excellent chemical stability in a temperature range of -60°C to +160°C, and is resistant to corrosion by weak acids, alkalis, alcohols and other solvents. It also has strong resistance to ozone, ultraviolet rays and oxidation, which helps to ensure the performance stability of the rubber cell structure 100 and improve the safety and reliability of the vibration damping and sound insulation components when used in various equipment.

[0043] In some embodiments, the sound-absorbing material layer 200 may be made of foam sound-absorbing material. Foam sound-absorbing material is lightweight and has good absorption effect, which can meet the need for further suppression of noise propagation and provide a damping effect. For example, the sound-absorbing material layer 200 may be made of polyimide foam material, which has the characteristics of maintaining stable physical properties in extreme temperature ranges, strong corrosion resistance, and self-extinguishing fireproof properties, which helps to ensure the performance stability of the sound-absorbing material layer 200 and further improves the safety and reliability of the vibration damping and sound insulation components when used in various equipment.

[0044] In some embodiments, the covering layer 300 may be made of fiberglass cloth and pressure-sensitive adhesive, and may be wrapped around the outer edge of the rubber cell structure 100 by means of adhesive bonding or other methods.

[0045] like Figure 4 As shown, Figure 4 The diagram shows a cross-sectional view of a support and fixing layer 400 according to one embodiment of this application. In some embodiments, the support and fixing layer 400 may include a constraint layer 410 and a fixing layer 420. The constraint layer 410 is disposed on the covering layer 300 and is configured to cause the fixing layer 420 to undergo shear deformation during vibration, thereby dissipating vibration energy. The fixing layer 420 is fixedly connected to the constraint layer 410 and is used to connect to an external object to be vibration-damped and sound-insulated.

[0046] In some embodiments, the constraint layer 410 supporting the fixing layer 400 may be made of a high-modulus material such as aluminum foil, and the fixing layer 420 may be made of a viscoelastic material so as to bond it to the external object to be vibration-damped and sound-insulated by utilizing its own adhesiveness.

[0047] In related technologies, the structures used to achieve vibration and noise reduction in the cabin environment often have high rigidity and high density, which is not conducive to meeting the lightweight requirements of equipment and is difficult to apply to the cabin environment with curved spaces. To address this issue, the vibration reduction and sound insulation component provided in the embodiments of this application adopts the rubber cell structure 100 as described above and is made of the materials as described above, making its structure compact and lightweight, which is conducive to meeting the lightweight requirements of equipment. It also has good flexibility and deformation capacity, which allows it to better fit objects with large curvatures and is suitable for use in cabin environments with curved spaces.

[0048] In some embodiments, the location of seams on the object to be vibration-damped and sound-insulated can be determined according to the structure of the object. The dimensions of the rubber cell structure 100 and the sound-absorbing material layer 200 are adjusted according to the location of the seams so that the vibration-damping and sound-insulating components form bosses or grooves. When multiple vibration-damping and sound-insulating components are spliced ​​together during the process of setting the vibration-damping and sound-insulating components on the object, it is convenient to cover the seams, thereby avoiding sound leakage due to the seams not being covered by the vibration-damping and sound-insulating components, which would affect the vibration-damping and sound-insulating effect.

[0049] In some embodiments, the vibration damping and sound insulation components of this application can be installed onto the object to be vibration damped and sound-insulated in other ways. For example, the vibration damping and sound insulation components of this application can be formed into multiple block-shaped structures, the size of which can be set to match the structural orientation of the object to be vibration damped and sound-insulated, and the multiple block-shaped structures can be installed into the object to be vibration damped and sound-insulated one by one.

[0050] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0051] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A rubber cell structure, characterized in that, It includes: The base, multiple first cell rings, and multiple second cell rings Each of the first cell rings is disposed inside each of the second cell rings, and they are arranged concentrically. Each of the second cell rings is arranged adjacent to each other; The plurality of first cell rings and the plurality of second cell rings are disposed on the substrate; The first cell ring and the second cell ring are configured as structures capable of generating local resonance effects.

2. The rubber cell structure according to claim 1, characterized in that, The radius of the first cell ring is determined as follows: Determine the expected resonance frequency; Determine the Young's modulus, Poisson's ratio, areal density, and thickness of the materials for the first and second cell rings; Based on the resonant frequency, the Young's modulus, Poisson's ratio, areal density, and thickness of the materials of the first and second cell rings, the radius of the first cell ring is determined.

3. The rubber cell structure according to claim 2, characterized in that, The resonant frequency, the Young's modulus of the materials of the first and second cell rings, the Poisson's ratio of the first and second cell rings, the areal density of the first and second cell rings, the thickness of the first and second cell rings, and the radius of the first cell ring conform to the following relationship: ， In the formula Let be the Young's modulus of the materials of the first cell ring and the second cell ring. The Poisson ratio of the first cell ring and the second cell ring. The areal density of the first cell ring and the second cell ring The thicknesses of the first cell ring and the second cell ring are given. These are coefficients determined based on experience. The resonant frequency is... Let be the radius of the first cell ring.

4. The rubber cell structure according to claim 3, characterized in that, The radius of the second cell ring is determined based on the radius of the first cell ring.

5. The rubber cell structure according to claim 4, characterized in that, The radii of the first cell ring and the radii of the second cell ring conform to the following relationship: ， In the formula Let be the Young's modulus of the materials of the first cell ring and the second cell ring. The Poisson ratio of the first cell ring and the second cell ring. The areal density of the first cell ring and the second cell ring The thicknesses of the first cell ring and the second cell ring are given. Let be the radius of the first cell ring. The radius of the second cell ring is denoted as . The resonant frequency is denoted as .

6. A vibration damping and sound insulation component, characterized in that, It includes a multilayered rubber cell structure as described in any one of claims 1-5.

7. The vibration damping and sound insulation component according to claim 6, characterized in that, It also includes: Sound-absorbing material layer, covering layer and supporting and fixing layer, The sound-absorbing material layer is disposed between the rubber cell structures. The coating layer covers the outside of the rubber cell structure. The supporting and fixing layer is disposed on the outside of the covering layer and is used to connect with the external object to be vibration-damped and sound-insulated.

8. The vibration damping and sound insulation component according to claim 7, characterized in that, The sound-absorbing material layer is configured to complement the vibration reduction and noise reduction frequency band of the rubber cell structure.

9. The vibration damping and sound insulation component according to claim 8, characterized in that, The acoustic impedance of the sound-absorbing material layer is determined in the following manner: The absorption coefficient of the sound-absorbing material layer is determined based on the frequency of the rubber cell structure. Determine the characteristic impedance of air; The acoustic impedance of the sound-absorbing material layer is determined based on the absorption coefficient of the sound-absorbing material layer and the characteristic impedance of the air.

10. The vibration damping and sound insulation component according to claim 9, characterized in that, The frequency of the rubber cell structure, the absorption coefficient of the sound-absorbing material layer, the characteristic impedance of the air, and the acoustic impedance of the sound-absorbing material layer conform to the following relationship: ， The acoustic impedance of the sound-absorbing material layer is given. Let f be the characteristic impedance of the air, and f be the frequency of the rubber cell structure. is the absorption coefficient of the sound-absorbing material layer.

Images