CN114104234B - Cover layer diffuse reflection type sound absorption super-structure unit and super-structure - Google Patents
Cover layer diffuse reflection type sound absorption super-structure unit and super-structure Download PDFInfo
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- CN114104234B CN114104234B CN202111444798.5A CN202111444798A CN114104234B CN 114104234 B CN114104234 B CN 114104234B CN 202111444798 A CN202111444798 A CN 202111444798A CN 114104234 B CN114104234 B CN 114104234B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 81
- 239000011347 resin Substances 0.000 claims abstract description 15
- 229920005989 resin Polymers 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 11
- 230000010363 phase shift Effects 0.000 claims abstract description 7
- 230000000737 periodic effect Effects 0.000 claims abstract description 3
- 239000010410 layer Substances 0.000 claims description 70
- 239000000463 material Substances 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 239000012814 acoustic material Substances 0.000 abstract description 10
- 238000013016 damping Methods 0.000 abstract description 6
- 239000006096 absorbing agent Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000003190 viscoelastic substance Substances 0.000 description 1
Classifications
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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
- B63G13/00—Other offensive or defensive arrangements on vessels; Vessels characterised thereby
- B63G13/02—Camouflage
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/20—Reflecting arrangements
- G10K11/205—Reflecting arrangements for underwater use
-
- 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
- B63G13/00—Other offensive or defensive arrangements on vessels; Vessels characterised thereby
- B63G13/02—Camouflage
- B63G2013/022—Camouflage using means for reducing noise emission into air or water
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Aviation & Aerospace Engineering (AREA)
- Revetment (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a cover layer diffuse reflection type sound absorption super-structure unit and a super-structure, wherein the super-structure comprises a plurality of cover layer diffuse reflection type super-structure units and a substrate; wherein the cover layer diffuse reflection sound absorption super-structure unit comprises a resin layer and an air cavity; the resin layer wraps the air cavity provided with the notch; the diffuse reflection type super-structure units of the plurality of covering layers are arranged on the substrate in a non-periodic manner; and a plurality of cover layers are arranged on the substrate, and diffuse reflection sound absorption super-structural units cover-pi discrete phase shifts. In the sub-wavelength range, the sound absorption super structure can realize perfect sound absorption of a wide frequency band, realize high-efficiency diffuse reflection effect on underwater sound waves in a low frequency band, reduce the intensity of forward echo signals, reduce the overall signal characteristics and realize stealth effect. Compared with the traditional cavity acoustic material, the invention has the characteristics of simple structure, good performance, low weight, non-periodicity, no need of damping layer and self-loss damping characteristic.
Description
Technical Field
The invention relates to the technical field of underwater sound absorption, in particular to a cover layer diffuse reflection type low-frequency broadband sound absorption super-structure unit and a super-structure.
Background
The underwater sound absorption coating is a ship underwater sound material and structure laid on the surface of a ship structure and between a ship body and sea water. The device can inhibit the vibration of the ship body, reduce the noise generated by mechanical vibration except a propulsion system, and reduce the radiation intensity of the ship target characteristic signals; but also can absorb the detection wave of the enemy active sonar, and reduce the intensity of the ship sound target. Therefore, the acoustic coating layer is laid on the structure and used as the last barrier for ship sound stealth, and the method has become an effective means for simultaneously improving the ship active and passive sound stealth performance.
The acoustic materials can be roughly classified into rubber-like pure polymer acoustic materials, filled acoustic materials, cavity acoustic materials, impedance-graded acoustic materials, and the like in the order of development of the acoustic cover layers. The rubber material has a generally low elastic modulus, is entropy elastic, generally has viscoelasticity, and can achieve good sound absorption and damping characteristics by adding a compounding agent into the rubber. The filling type acoustic material is prepared by mixing or adding filler into rubber, and sound waves generate a large amount of sound scattering phenomenon between the filling material and the rubber to achieve sound absorption performance. The cavity acoustic material is a material which is formed by periodically arranging spherical, cylindrical, conical or horn-shaped cavity structures in a uniform matrix material, and the absorption of the incident acoustic energy is realized by the combined action of cavity resonance, waveform conversion, acoustic scattering and self damping loss characteristics of the viscoelastic material. The impedance gradient acoustic material adopts a multi-layer sound absorption structure, the impedance of each layer of structure is gradually changed from the water impedance of the outermost layer to be consistent with the impedance of the inner cabin, and the reflection is reduced through impedance matching to realize sound absorption.
The traditional underwater sound absorption material is mainly based on intramolecular friction caused by sound waves in the material and energy dissipation mechanisms of the sound waves on different medium interfaces, and the performance of the traditional sound absorption layer with uniform material characteristics depends on the thickness of the traditional sound absorption layer. The sound absorber can absorb sound wave completely only when the thickness of the sound absorber is at least one quarter wavelength of the incident sound wave, which is why the traditional sound absorbing material has poor performance of absorbing low-frequency underwater sound wave and is difficult to realize broadband sound absorption. Most of the existing high-efficiency sound absorption structures are based on the acoustic super-surface theory, and a series of perfect/quasi-perfect sound absorbers with sub-wavelength thickness or low weight are designed, including Helmholtz resonators, quarter-wavelength frequency resonators, acoustic membrane absorbers, lossless resonant plates and labyrinth sound absorbers. Although there are several groups studying airborne sound waves, there are few reports of perfect sound absorbers for hydroacoustic sound. The perfect absorption of wideband sound of water sound in the sub-wavelength range remains a challenge.
Disclosure of Invention
The invention aims to provide a sound absorption super structure designed by utilizing an acoustic super surface to wave front phase regulation and control method, which is a cover layer diffuse reflection type low-frequency broadband sound absorption super structure based on a Helmholtz resonant cavity structure, and can realize the high-efficiency diffuse reflection effect on underwater sound waves in a low frequency band (750 Hz-1300 Hz), reduce the intensity of forward echo signals, reduce the overall signal characteristics and realize the stealth effect.
In order to achieve the above object, the present invention provides the following technical solutions:
the diffuse reflection sound absorption super-structure unit of the cover layer comprises a resin layer and an air cavity;
the resin layer wraps the air cavity provided with the notch;
the cover layer diffusely reflects the sound absorption super-structure unit to cover-pi discrete phase shift.
Optionally, a structural parameter of the air cavity is changed, resulting in a different additional reflection phase.
Optionally, the structural parameters of the air cavity include: gap size, height, width, length.
Optionally, the resin material is a ceramic resin.
A cover layer diffuse reflection type sound absorption super structure comprises a plurality of cover layer diffuse reflection type super structure units and a substrate;
the plurality of cover layer diffuse reflection type super-structure units are arranged on the substrate in a non-periodic manner;
and a plurality of cover layers are arranged on the substrate, and diffuse reflection sound absorption super-structural units cover-pi discrete phase shifts.
Optionally, the cover layer diffuse reflection sound absorption super-structure unit notch faces outwards, and the plurality of cover layer diffuse reflection super-structure units are arranged on the same side of the substrate as the cover layer diffuse reflection sound absorption super-structure unit notch.
Compared with the prior art, the invention has the following beneficial effects:
in the sub-wavelength range, the sound absorption super structure can realize perfect sound absorption of a wide frequency band, can realize high-efficiency diffuse reflection effect on underwater sound waves in a low frequency band (750 Hz-1300 Hz), reduces the intensity of a forward echo signal, reduces the overall signal characteristics, and realizes the stealth effect. Compared with the traditional cavity acoustic material, the invention has the characteristics of simple structure, good performance, low weight, non-periodicity, no need of damping layer and self-loss damping characteristic. The structure of the invention is designed based on the acoustic super surface theory and is a perfect sound absorber for broadband underwater sound in a sub-wavelength range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a cover layer diffuse reflection type low-frequency broadband sound absorption super structure formed by 8 two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure units 2;
FIGS. 2 (a) -2 (h) are two-dimensional schematic structural diagrams of the diffuse reflection type sound absorption super-structure unit of 8 two-dimensional cover layers of example 1;
FIG. 3 is a simulation result of reflection phase curves of the 8 two-dimensional cover layer diffuse reflection type sound absorption super-structure unit 2 in FIG. 2;
FIG. 4 is a schematic structural diagram of a three-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure of the invention;
FIGS. 5 (a) -5 (l) are far-field patterns of the cover layer diffuse reflection type low-frequency broadband sound absorption superstructure of example 1 normalized in the frequency band of 750 Hz-1300 Hz;
FIG. 6 is a graph showing the attenuation degree of energy in the echo direction of the diffuse reflection type low-frequency broadband sound absorption superstructure of the coating layer of the embodiment 1 in the frequency range of 750 Hz-1300 Hz;
in the figure: 1 a substrate, 2 a cover layer diffuse reflection type sound absorption super-structure unit, 3 a resin layer and 4 an air cavity.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
the embodiment discloses a diffuse reflection type low-frequency broadband sound absorption super structure of a two-dimensional covering layer, which comprises the following components: a substrate 1 and a cover layer diffuse reflection sound absorption super-structure unit 2; fig. 1 is a schematic cross-sectional view of a cover layer diffuse reflection type low-frequency broadband sound absorption super structure formed by 8 two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure units 2;
in the embodiment, the two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure consists of 40 cover layer diffuse reflection type sound absorption super structure units 2 and a substrate 1, wherein each cover layer diffuse reflection type sound absorption super structure unit 2 consists of a resin layer 3 and an air cavity 4, and the thickness of each cover layer diffuse reflection type sound absorption super structure unit 2 is 6cm, and the width of each cover layer diffuse reflection type sound absorption super structure unit is 10cm;
wherein, the cover layer diffuse reflection sound absorption super structure unit 2 has 8 specific structures as shown in figure 2; the substrate 1 is a stainless steel plate, and the specific material parameters of the stainless steel are as follows: density ρ 1 ＝7800kg/m 3 Young's modulus of E 1 =216 GPa, poisson coefficient v 1 =0.3, thickness 2cm, width 400cm; the resin layer 3 is high-toughness high-temperature-resistant ceramic resin, and the specific parameters are as follows: ρ 2 ＝1050kg/m 3 Storage modulus of E 2 =10.5 GPa, poisson coefficient v 2 =0.32; the specific material parameters of the air chamber 4 are as follows: density ρ 3 ＝1.21kg/m 3 Sound velocity v 1 ＝343m/s；
The resin layer wraps the air cavity 4 provided with a notch, and the size, width, length and height of the notch can be adjusted;
specifically:
different additional reflection phases can be generated by the cover layer diffuse reflection type sound absorption super-structure unit 2 in the frequency range of 750 Hz-1300 Hz, the wave front of the incident wave is regulated and controlled, and different reflection phase change curves can be generated by changing the internal structural parameters of the cover layer diffuse reflection type sound absorption super-structure unit 2, wherein the structural sound absorption frequency range in the embodiment 1 is 750 Hz-1300 Hz;
by adjusting the structural parameters of the diffuse reflection type sound absorption super-structure unit 2 of the cover layer, 8 units can realize-pi discrete phase shift within the frequency range of 750 Hz-1300 Hz, and the phase change curve is shown in figure 3. In this band, the phase shift interval of 8 phase change curves is pi/4. The diffuse reflection type super-absorbing structural units 2 of the 8 cover layers capable of realizing-pi discrete phase shift in the frequency range of 750 Hz-1300 Hz are subjected to aperiodic arrangement, so that a broadband diffuse reflection effect can be realized, main lobe echo energy is reduced, the energy is scattered to other directions except the forward direction, and a stealth effect can be realized on the forward echo direction, wherein the notch direction is the forward direction;
as shown in fig. 5, according to the far field pattern normalized by the cover layer diffuse reflection type low-frequency broadband sound absorption super structure in the frequency range of 750Hz to 1300Hz, compared with a background plate, as can be seen from the image information, for the sound wave vertically incident, in the reflection direction, the main lobe echo energy of the two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure is reduced, and the diffuse reflection effect is obvious;
as shown in FIG. 6, the attenuation degree graph of the energy of the cover layer diffuse reflection type low-frequency broadband sound absorption super structure in the echo direction in the frequency range of 750Hz to 1300Hz in embodiment 1 can be seen from the picture information, and the intensity reduction of more than 10dB can be generated in the echo direction in the frequency range of 750Hz to 1300Hz, so that the intensity of a forward echo signal can be effectively reduced by the two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure with random distribution, and the signal characteristics of the forward echo signal can be reduced, so that the forward echo signal is difficult to detect by sonar;
note that the 8 types of cover layer diffuse reflection sound absorption super-structure units 2 employed in the present embodiment 1 are examples, and the overall structure is not limited to the 8 types of cover layer diffuse reflection sound absorption super-structure units 2.
Example 2
This embodiment 2 is a cover diffuse reflection type low-frequency broadband sound absorption super structure having 8 kinds of three-dimensional cover diffuse reflection type low-frequency broadband sound absorption super structure units 2 on the basis of embodiment 1, and the three-dimensional cover diffuse reflection type low-frequency broadband sound absorption super structure in this embodiment is stretched on the basis of embodiment 1, which is the same as the cross section shown in fig. 1 in embodiment 1, and the whole structure is shown in fig. 4;
in this embodiment 2, the operation performance of the three-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure may be approximately equivalent to that of an infinite length two-dimensional cover layer diffuse reflection type low-frequency broadband sound absorption super structure. Accordingly, fig. 5 and 6 may also be the degree of attenuation of sound waves in the far field pattern and echo direction of the three-dimensional blanket diffuse reflection type low-frequency broadband sound absorption superstructure. It can be seen that the cover layer diffuse reflection type low-frequency broadband sound absorption super structure with the random distribution infinite fluid plates can effectively reduce the energy in the echo direction, so that the energy is difficult to detect, and the stealth effect is realized.
For the device disclosed in the embodiments, the description is relatively simple, and the relevant parts refer to part of the description, because the device corresponds to the content disclosed in the embodiments. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. The diffuse reflection sound absorption super-structure unit (2) of the coating layer is characterized by comprising a resin layer (3) and an air cavity (4);
the resin layer (3) wraps the air cavity (4) provided with the notch;
the structural parameters of the air cavity (4) are changed, different additional reflection phases are generated, energy is scattered to other directions except the forward direction, and a stealth effect can be realized on the forward echo direction, wherein the notch direction is the forward direction;
the structural parameters of the air cavity (4) comprise: the size, height, width and length of the notch;
the air cavity extends along the perimeter direction of the rectangular structure, a notch is arranged at the long side of the top of the rectangular structure, the size of the notch is smaller than that of the long side of the rectangular structure, and the notch is positioned in the middle of the long side;
the gaps of the cover layer diffuse reflection sound absorption super-structure units (2) face outwards, and the cover layer diffuse reflection sound absorption super-structure units (2) are arranged on the same side of the base plate as the gaps of the cover layer diffuse reflection sound absorption super-structure units (2).
2. A cover layer diffuse reflection sound absorption super structure unit (2) according to claim 1, characterized in that the material of the resin layer (3) is ceramic resin.
3. The utility model provides a overburden diffuse reflection formula sound absorption super structure, includes a plurality of overburden diffuse reflection sound absorption super structure unit (2), base plate (1), its characterized in that: the cover layer diffuse reflection sound absorption super-structure unit (2) is a cover layer diffuse reflection sound absorption super-structure unit (2) according to any one of claims 1-2;
the plurality of cover layers diffuse reflection sound absorption super-structure units (2) are arranged on the substrate (1) in a non-periodic manner;
the plurality of cover layer diffuse reflection sound absorption super-structure units (2) arranged on the substrate (1) cover-pi discrete phase shift.
4. The diffuse reflection type sound absorption super structure of the cover layer according to claim 3, wherein the gaps of the diffuse reflection type sound absorption super structure units (2) of the cover layer are outwards, and the diffuse reflection type sound absorption super structure units (2) of the plurality of cover layers are arranged on the same side of the base plate (1) as the gaps of the diffuse reflection type sound absorption super structure units of the cover layer.
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| CN202111444798.5A CN114104234B (en) | 2021-11-30 | 2021-11-30 | Cover layer diffuse reflection type sound absorption super-structure unit and super-structure |
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| CN202111444798.5A CN114104234B (en) | 2021-11-30 | 2021-11-30 | Cover layer diffuse reflection type sound absorption super-structure unit and super-structure |
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| CN114104234B true CN114104234B (en) | 2023-08-08 |
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| CN115050348B (en) * | 2022-06-09 | 2024-03-22 | 青岛大学 | Bubble type underwater broadband diffuse reflection coding acoustic super surface and application method thereof |
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| WO2005083676A1 (en) * | 2004-02-25 | 2005-09-09 | Wilhelm Karmann Gmbh | Acoustic absorber |
| JP2006267476A (en) * | 2005-03-23 | 2006-10-05 | Aisin Seiki Co Ltd | Sound absorbing body and sound absorbing apparatus |
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| CN114104234A (en) | 2022-03-01 |
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