CN111619779A - Vibration isolation device based on acoustic black hole structure and ship system - Google Patents
Vibration isolation device based on acoustic black hole structure and ship system Download PDFInfo
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- CN111619779A CN111619779A CN202010467784.4A CN202010467784A CN111619779A CN 111619779 A CN111619779 A CN 111619779A CN 202010467784 A CN202010467784 A CN 202010467784A CN 111619779 A CN111619779 A CN 111619779A
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- black hole
- acoustic black
- hole structure
- vibration
- vibration isolation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/30—Mounting of propulsion plant or unit, e.g. for anti-vibration purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/28—Arrangement of offensive or defensive equipment
- B63G8/34—Camouflage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention relates to the technical field of vibration isolation, and discloses a vibration isolation device based on an acoustic black hole structure and a ship system. According to the vibration isolation device based on the acoustic black hole structure and the ship system, the vibration energy transmitted by the vibration source equipment is gathered to the acoustic black hole structure through the acoustic black hole structure on the supporting structure, so that the efficient gathering of the vibration energy is realized, on the basis, the local vibrator component is arranged at the acoustic black hole structure, so that the efficient absorption of the vibration energy can be realized, and the vibration isolation effect is effectively improved in the vibration transmission process of the vibration source equipment.
Description
Technical Field
The invention relates to the technical field of vibration isolation, in particular to a vibration isolation device based on an acoustic black hole structure and a ship system.
Background
The power machine is the most important vibration noise source of the ship, the violent vibration can cause the fatigue damage of the structure, induce the mechanical failure and reduce the performance and the safe reliability of the power machine, more importantly, the vibration of the power machine is transmitted to the ship body through the vibration absorber, the vibration of the ship body causes the underwater radiation noise, the excessive radiation noise can influence the sound self-guidance and guidance of the underwater ship, and is easy to expose itself, the self sound stealth is reduced, and the power machine becomes an important factor influencing the ship concealment and the vitality.
The vibration isolation technology is considered as a main technical means for controlling vibration transmission of mechanical equipment, however, the traditional vibration isolation technology has certain limitations. In order to improve the low-frequency vibration isolation effect, the vibration absorber needs to have low enough rigidity, and simultaneously has larger static rigidity in order to ensure certain bearing capacity and stability, so that the traditional passive vibration isolation technology can effectively isolate medium-high frequency vibration of mechanical equipment, but has poor control effect on the low-frequency vibration, and for a ship, underwater radiation noise generated by the low-frequency vibration has vital influence on the concealment and vitality of the ship due to the fact that the propagation distance is long and the attenuation is not easy. Theoretically, the active vibration isolation technology can effectively control low-frequency vibration, but because the active control system is an electromechanical integrated system, the system is complex and expensive, and is influenced and limited by various factors such as installation space, weight and the like, the engineering application of the active vibration isolation technology in the field of domestic ships faces great difficulty at present.
The traditional vibration isolation technology at present has the problems of poor control effect on low-frequency vibration and incapability of meeting the vibration isolation requirement of ship mechanical equipment.
Disclosure of Invention
The embodiment of the invention provides a vibration isolation device based on an acoustic black hole structure and a ship system, which are used for solving or partially solving the problems that the conventional vibration isolation technology has poor control effect on low-frequency vibration and can not meet the vibration isolation requirement of ship mechanical equipment.
The embodiment of the invention provides a vibration isolation device based on an acoustic black hole structure, which comprises a supporting structure, wherein the supporting structure is arranged between vibration source equipment and an installation base, a plurality of acoustic black hole structures are constructed on the supporting structure, and the acoustic black hole structures are connected with local oscillator components.
On the basis of the scheme, the plurality of acoustic black hole structures are uniformly distributed on the supporting structure.
On the basis of the scheme, the upper surface and the lower surface of the acoustic black hole structure are respectively provided with a damping coating.
On the basis of the scheme, the upper surface and the lower surface of the acoustic black hole structure are respectively concave, and the thickness of the acoustic black hole structure is continuously increased from the middle to the edge.
On the basis of the scheme, a supporting platform with uniform thickness is formed in the middle of the acoustic black hole structure.
On the basis of the scheme, the local oscillator component is connected to the supporting platform.
On the basis of the scheme, the local oscillator component is connected above or below the acoustic black hole structure.
On the basis of the scheme, the local oscillator component comprises a supporting spring and a mass block, wherein one end of the supporting spring is connected with the acoustic black hole structure, and the other end of the supporting spring is connected with the mass block.
On the basis of the scheme, the upper surface of the supporting structure is connected with an upper-layer vibration isolator used for being connected with vibration source equipment, and the lower surface of the supporting structure is connected with a lower-layer vibration isolator used for being connected with a mounting base.
The embodiment of the invention provides a ship system which comprises the vibration isolation device based on the acoustic black hole structure, vibration source equipment, an installation base and a ship shell, wherein the vibration isolation device is arranged between the vibration source equipment and the installation base, and the installation base is fixed on the ship shell.
According to the vibration isolation device based on the acoustic black hole structure and the ship system, the vibration energy transmitted by the vibration source equipment is gathered to the acoustic black hole structure through the acoustic black hole structure on the supporting structure, so that the efficient gathering of the vibration energy is realized, on the basis, the local vibrator assembly is arranged at the acoustic black hole structure, so that the efficient absorption of the vibration energy can be realized, and the vibration isolation effect is effectively improved in the vibration transmission process of the vibration source equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is an overall connection schematic diagram of a vibration isolation device based on an acoustic black hole structure according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an acoustic black hole structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the distribution of the acoustic black hole structure on the support structure according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a support structure in an embodiment of the invention.
Description of reference numerals:
wherein, 1, a vibration source device; 2. an upper vibration isolator; 3. a support structure; 4. an acoustic black hole structure; 5. a damping coating; 6. a local oscillator assembly; 6a, a mass block; 6b, a support spring; 7. a lower layer vibration isolator; 8. mounting a base; 9. a hull of the vessel; 10. a support platform; 11. areas of smoothly varying thickness.
Detailed Description
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. 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.
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.
Referring to fig. 1, an embodiment of the present invention provides a vibration isolation device based on an acoustic black hole structure, the vibration isolation device includes a support structure 3, the support structure 3 is configured to be disposed between a vibration source device 1 and a mounting base 8, a plurality of acoustic black hole structures 4 are configured on the support structure 3, and referring to fig. 2, the acoustic black hole structures 4 are connected to a local oscillator assembly 6.
An acoustic black hole structure 4 is configured and formed on the support structure 3 for gathering vibration energy transmitted from the vibration source apparatus 1. A local oscillator assembly 6 is connected to the acoustic black hole structure 4 for absorbing the vibration energy gathered by the acoustic black hole structure 4. The vibration energy transferred by the source device 1 is concentrated by the acoustic black hole structure 4 in the support structure 3.
The utility model provides a vibration isolation mounting based on acoustics black hole structure, through acoustics black hole structure 4 on the bearing structure 3, assemble the vibration energy of vibration source equipment 1 transmission in acoustics black hole structure 4, realize the high-efficient gathering of vibration energy, on this basis, through installing local oscillator subassembly 6 in acoustics black hole structure 4 department, can realize the high-efficient absorption of vibration energy to in the vibration transmission in-process of vibration source equipment 1, effectively promote the vibration isolation effect.
The supporting structure 3 is arranged to meet the requirement of static rigidity for stably supporting the vibration source equipment 1, and the acoustic black hole structure 4 is arranged on the supporting structure 3 to realize efficient gathering and absorption of vibration energy, so that the control effect of low-frequency vibration can be improved, the supporting rigidity requirement can be met, the vibration isolation requirement can be met, and the vibration isolation requirement of ship mechanical equipment can be met. Further, the acoustic black hole structure 4 is formed on the support structure 3, the support structure 3 is processed on the basis of the support structure 3 to form the acoustic black hole structure 4, and the acoustic black hole structure 4 and the support structure 3 are integrated, so that the static rigidity of the support structure 3 is further increased.
Further, the supporting structure 3 may be a steel plate, or may be made of other materials, so as to meet the requirement of supporting rigidity, and is not limited specifically.
On the basis of the above embodiment, further, with reference to fig. 3, several acoustic black hole structures 4 are evenly distributed on the support structure 3. The vibration source device 1 can uniformly and fully absorb the vibration energy transmitted by the vibration source device, and is favorable for ensuring the vibration isolation effect.
Further, a local oscillator module 6 is connected to each acoustic black hole structure 4. So that the local oscillator modules 6 are equally distributed over the support structure 3 as well. Preferably, the acoustic black hole structures 4 are uniformly symmetrically distributed with respect to the vibration source device 1.
The distribution of the acoustic black hole structure 4 and the local oscillator assembly 6 in the supporting structure 3 is in a uniform form, and the supporting structure 3 is made into an artificial phononic crystal structure by utilizing the uniformity of the acoustic black hole structure 4 and the local oscillator assembly 6, and the artificial phononic crystal has the characteristics of a Bragg scattering type phononic crystal and a local resonance type phononic crystal, so that a vibration wide frequency band gap of the supporting structure 3 is obtained, the attenuation amplitude of the vibration amplitude of the supporting structure 3 is effectively increased, and the action range of the vibration band gap of the supporting structure 3 is expanded to a low frequency.
Further, referring to fig. 3, in the present embodiment, the support structure 3 may be rectangular, the outer contour of the acoustic black hole structure 4 may be circular, and the acoustic black hole structures 4 may be uniformly distributed on the support structure 3 in an array. The support structure 3 may also be other shapes, such as circular, square or any other regular irregular shape; the outer contour of the acoustic black hole structure 4 can be any other regular irregular shape to meet the requirement of thickness variation; the acoustic black hole structure 4 can be arranged on the support structure 3 in other ways; and is not particularly limited.
On the basis of the above embodiment, further, referring to fig. 2, the upper and lower surfaces of the acoustic black hole structure 4 are respectively provided with damping coatings 5. The damping coating 5 is used to dissipate the vibrational energy collected by the acoustic black hole structure 4.
On the basis of the above embodiment, further, the upper and lower surfaces of the acoustic black hole structure 4 are concave respectively, and the thickness of the acoustic black hole structure 4 increases continuously from the middle to the edge. The upper and lower surfaces of the acoustic black hole structure 4 are concave compared to the surface of the support structure 3. And is a smooth continuous concave surface. The edge of the acoustic black hole structure 4 is smoothly connected with the surface of the support structure 3.
On the basis of the above embodiment, further, the supporting platform 10 with uniform thickness is formed in the middle of the acoustic black hole structure 4.
On the basis of the above embodiment, further, the local oscillator module 6 is connected to the support platform 10. Forming the support platform 10 in the middle of the acoustic black hole structure 4 may facilitate connection of the local oscillator assembly 6 at the support platform 10. The acoustic black hole structure 4 increases in thickness continuously from the support platform 10 to the edge region.
Specifically, the acoustic black hole structure 4 is composed of an intermediate support platform 10 and a smoothly varying thickness region 11. The thickness of the structure of the smooth variation of thickness region 11 varies exponentially. Referring to fig. 2, specifically, the thickness h (x) of the smooth thickness variation region 11 is equal to xmWherein the index m is more than or equal to 2, and the coefficient can be selected according to actual conditions and experience. I.e. the surface of the smoothly varying thickness region 11 in fig. 2 is at x1And x2Between two points in an exponential function, where x1The outer side position of the supporting platform 10 is the starting position of the smooth thickness change area 11, x2Is the end position of the smoothly varying thickness region 11.
The thickness smooth change area 11 enables the local structure impedance of the supporting structure 3 to change smoothly along with the thickness change, the wave speed of the bending wave is reduced along with the change, a large amount of vibration energy is gathered in the middle of the acoustic black hole structure 4, and efficient gathering of the vibration energy is achieved. Furthermore, on one hand, damping coatings 5 are adhered to the upper concave surface and the lower concave surface of the acoustic black hole structure 4, so that the effect of losing vibration energy of the acoustic black hole structure 4 is achieved, and the vibration response of the middle supporting structure 3 at the resonance frequency in the whole frequency domain range can be reduced; on the other hand, the local oscillator assembly 6 is arranged on the support platform 10 in the middle of the acoustic black hole structure 4, so that the effect of transferring and absorbing the vibration energy in the area of the acoustic black hole structure 4 to the local oscillator assembly 6 is achieved, and the vibration response of the support structure 3 can be effectively reduced.
In the embodiment, the acoustic black hole structure 4, the damping coating 5 and the local oscillator assembly 6 distributed on the supporting structure 3 are utilized to realize the high-efficiency aggregation, loss and absorption of structural vibration energy, so that the structural vibration is strongly attenuated in the vibration transmission process of the vibration source equipment 1, and the vibration isolation effect is effectively improved. Furthermore, the upper surface and the lower surface of the acoustic black hole structure 4 are both concave surfaces, so that the collection of vibration energy is facilitated, and the vibration isolation effect is improved.
On the basis of the above embodiment, further, referring to fig. 4, the local oscillator module 6 is connected above or below the acoustic black hole structure 4.
On the basis of the above embodiment, further, the local oscillator assembly 6 includes a support spring 6b and a mass 6a, one end of the support spring 6b is connected to the acoustic black hole structure 4, and the other end of the support spring 6b is connected to the mass 6 a.
Referring to fig. 1 and 4, the local oscillator assembly 6 includes a lumped mass 6a and a support spring 6b, and may be installed on the upper or lower portion of the acoustic black hole structure 4 support platform 10 of the support structure 3 in a forward installation manner or a reverse hoisting manner according to installation space conditions. In this embodiment, the local oscillator assembly 6 has an effect of suppressing the low-frequency characteristic line spectrum of the structural vibration, and specifically, for the strongest excitation frequency of the vibration source device 1, the peak value of the strongest low-frequency line spectrum in the support structure 3 can be greatly reduced by reasonably designing the mass of the mass block 6a and the rigidity of the support spring 6b in the local oscillator assembly 6. The specific mass of the mass 6a and the specific stiffness of the support springs 6b can be determined empirically or experimentally in combination with the actual situation.
On the basis of the above embodiment, the upper surface of the supporting structure 3 is connected with the upper-layer vibration isolator 2 for connecting with the vibration source equipment 1, and the lower surface of the supporting structure 3 is connected with the lower-layer vibration isolator 7 for connecting with the mounting base 8.
On the basis of the above embodiments, further, referring to fig. 1, the present embodiment provides a ship system, which includes the vibration isolation device based on the acoustic black hole structure 4 according to any of the above embodiments, and further includes a vibration source device 1, a mounting base 8, and a ship housing 9, where the vibration isolation device is disposed between the vibration source device 1 and the mounting base 8, and the mounting base 8 is fixed to the ship housing 9. The vibration source apparatus 1 in the marine system may be a power plant.
On the basis of the above embodiments, further, in the present embodiment, in order to overcome the defects of the current ship power machine vibration isolation technology, a ship power machine vibration isolation system having low-frequency broadband performance, small additional influence, and low cost is provided. The utility model discloses a vibration isolation device based on acoustics black hole structure 4, its low frequency broadband effect that is used for promoting vibration isolation can be used to the vibration isolation of boats and ships vibration source equipment 1, can effectively promote the low frequency range vibration isolation effect. The vibration isolation device includes: an acoustic black hole structure 4 for collecting vibration energy transmitted by the vibration source apparatus 1; the supporting structure 3 is distributed with uniform acoustic black hole structures 4, is connected with the upper layer vibration isolator 7 and the lower layer vibration isolator 7 and is used as a main channel for transmitting vibration from the vibration source equipment 1 to the ship shell 9; a damping coating 5 for dissipating the vibration energy gathered by the acoustic black hole structure 4; and the local oscillator assembly 6 is used for absorbing the vibration energy gathered by the acoustic black hole structure 4.
This embodiment can realize the high-efficient gathering of vibration energy through acoustics black hole structure 4 at the in-process of vibration source equipment 1 to the transmission of boats and ships casing 9, and damping coating 5 and local oscillator realize high-efficient loss and the absorption of vibration energy to utilize the homogeneity of acoustics black hole structure 4 and local oscillator to obtain the low frequency vibration band gap, reach the purpose of effectively promoting the vibration isolation low frequency broadband effect.
In the embodiment, the acoustic black hole structure 4 in the support structure 3 enables the structural impedance to change smoothly along with the change of the thickness, and the energy of the bending wave is converged in the middle of the acoustic black hole structure 4, so that the efficient collection of the vibration energy is realized. On this basis, through pasting damping coating 5 at the upper and lower concave surface of acoustics black hole to at acoustics black hole structure 4 supporting platform 10 installation local oscillator subassembly 6, can realize high-efficient loss and the absorption of vibration energy, thereby at the in-process of vibration source equipment 1 to the transmission of boats and ships casing 9 vibration, effectively promote the vibration isolation effect.
In the embodiment, the distribution of the acoustic black hole structure 4 and the local oscillator component 6 in the support structure 3 is in a uniform form, so that the support structure 3 becomes an artificial phononic crystal structure, and the artificial phononic crystal has the characteristics of both a bragg scattering type phononic crystal and a local resonance type phononic crystal, thereby obtaining a vibration wide frequency band gap of the support structure 3, effectively increasing the attenuation amplitude of the vibration amplitude of the support structure 3, and expanding the action range of the vibration band gap of the support structure 3 to a low frequency.
The local oscillator assembly 6 in the embodiment has the function of inhibiting the structural vibration low-frequency characteristic line spectrum, and aiming at the strongest excitation frequency of the vibration source equipment 1, the peak value of the strongest low-frequency line spectrum in the structure is greatly reduced by reasonably designing the mass of the mass block 6a and the rigidity of the supporting spring 6b in the local oscillator.
The number, size and distribution of the acoustic black hole structures 4 in the supporting structure 3 and design parameters of the local oscillator assembly 6 can be flexibly determined according to excitation characteristics of different vibration source devices 1 while the effect of improving the vibration isolation low-frequency broadband of the ship vibration source device 1 is achieved, and the method is wide in application range, easy to implement and low in cost. The specific number, size and distribution of the acoustic black hole structures 4 can be set according to the excitation characteristics and the supporting rigidity of the actual vibration source device 1, and are not limited specifically.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The vibration isolation device based on the acoustic black hole structure is characterized by comprising a supporting structure, wherein the supporting structure is used for being arranged between vibration source equipment and a mounting base, a plurality of acoustic black hole structures are constructed on the supporting structure, and the acoustic black hole structures are connected with local oscillator components.
2. The acoustic black hole structure-based vibration isolation device according to claim 1, wherein a number of the acoustic black hole structures are uniformly distributed on the support structure.
3. The acoustic black hole structure-based vibration isolation device according to claim 1, wherein the upper and lower surfaces of the acoustic black hole structure are respectively provided with damping coatings.
4. The vibration isolation device based on the acoustic black hole structure according to any one of claims 1 to 3, wherein the upper and lower surfaces of the acoustic black hole structure are concave respectively, and the thickness of the acoustic black hole structure increases continuously from the middle to the edge.
5. The acoustic black hole structure-based vibration isolation device according to claim 4, wherein a supporting platform with a uniform thickness is formed at the middle part of the acoustic black hole structure.
6. The acoustic black hole structure-based vibration isolation device according to claim 5, wherein the local oscillator component is connected to the support platform.
7. The acoustic black hole structure-based vibration isolation device according to any one of claims 1 to 3, wherein the local oscillator component is connected above or below the acoustic black hole structure.
8. The acoustic black hole structure-based vibration isolation device according to any one of claims 1 to 3, wherein the local oscillator assembly comprises a supporting spring and a mass, one end of the supporting spring is connected to the acoustic black hole structure, and the other end of the supporting spring is connected to the mass.
9. The acoustic black hole structure-based vibration isolation device according to any one of claims 1 to 3, wherein an upper vibration isolator for connecting with a vibration source device is connected to the upper surface of the supporting structure, and a lower vibration isolator for connecting with a mounting base is connected to the lower surface of the supporting structure.
10. A marine system comprising the acoustic black hole structure-based vibration isolation apparatus according to any one of claims 1 to 9, further comprising a vibration source device, a mounting base, and a marine hull, wherein the vibration isolation apparatus is disposed between the vibration source device and the mounting base, and the mounting base is fixed to the marine hull.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010467784.4A CN111619779A (en) | 2020-05-28 | 2020-05-28 | Vibration isolation device based on acoustic black hole structure and ship system |
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| CN202010467784.4A CN111619779A (en) | 2020-05-28 | 2020-05-28 | Vibration isolation device based on acoustic black hole structure and ship system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314088A (en) * | 2021-05-18 | 2021-08-27 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phonon crystal mixed vibration and noise reduction enhancement structure |
| CN113658573A (en) * | 2021-08-24 | 2021-11-16 | 东北大学 | Spiral two-dimensional acoustic black hole vibration isolation and noise reduction structure |
| CN115359773A (en) * | 2022-08-17 | 2022-11-18 | 东北大学 | Vibration and noise reduction plate based on destructive interference and acoustic black hole structure |
| CN116682401A (en) * | 2023-07-31 | 2023-09-01 | 南京理工大学 | Nested acoustic black hole beam structure |
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2020
- 2020-05-28 CN CN202010467784.4A patent/CN111619779A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113314088A (en) * | 2021-05-18 | 2021-08-27 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phonon crystal mixed vibration and noise reduction enhancement structure |
| CN113314088B (en) * | 2021-05-18 | 2022-06-28 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phononic crystal mixed vibration and noise reduction enhancement structure |
| CN113658573A (en) * | 2021-08-24 | 2021-11-16 | 东北大学 | Spiral two-dimensional acoustic black hole vibration isolation and noise reduction structure |
| CN113658573B (en) * | 2021-08-24 | 2023-07-14 | 东北大学 | Spiral two-dimensional acoustic black hole vibration isolation and noise reduction structure |
| CN115359773A (en) * | 2022-08-17 | 2022-11-18 | 东北大学 | Vibration and noise reduction plate based on destructive interference and acoustic black hole structure |
| CN116682401A (en) * | 2023-07-31 | 2023-09-01 | 南京理工大学 | Nested acoustic black hole beam structure |
| CN116682401B (en) * | 2023-07-31 | 2023-10-03 | 南京理工大学 | Nested acoustic black hole beam structure |
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