CN110189739A - A kind of acoustics superstructure design method by modified paint - Google Patents
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- CN110189739A CN110189739A CN201910448023.1A CN201910448023A CN110189739A CN 110189739 A CN110189739 A CN 110189739A CN 201910448023 A CN201910448023 A CN 201910448023A CN 110189739 A CN110189739 A CN 110189739A
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- 238000013461 design Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003973 paint Substances 0.000 title abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 172
- 239000011248 coating agent Substances 0.000 claims abstract description 167
- 239000010410 layer Substances 0.000 claims abstract description 37
- 230000006978 adaptation Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 230000033228 biological regulation Effects 0.000 claims abstract description 7
- 238000012986 modification Methods 0.000 claims description 24
- 230000004048 modification Effects 0.000 claims description 24
- 239000002131 composite material Substances 0.000 claims description 14
- 239000010408 film Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 8
- 239000010409 thin film Substances 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 4
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- 239000011229 interlayer Substances 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 20
- 210000004027 cell Anatomy 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 11
- 238000013016 damping Methods 0.000 description 10
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000000051 modifying effect Effects 0.000 description 5
- 239000004677 Nylon Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 210000003850 cellular structure Anatomy 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000004952 Polyamide Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 239000012814 acoustic material Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000010363 phase shift Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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Abstract
The invention discloses a kind of acoustics superstructure design methods by modified paint, coating is introduced into film and sheet-type acoustic construction by this method in the form of coating, vibration and acoustical behavior due to film and thin-slab structure is very sensitive to the substance for being attached to surface, in this way, by the coating for adding different ratio in film and thin sheet surface, the acoustical behavior of this class formation of energy Effective Regulation achievees the purpose that acoustics is modified.Specifically, forming coating after solidification, in this measure, other than the parameter of film and thin plate itself is adjustable, the proportion and thickness of coating also can according to need regulation one is a coating is applied in film or thin sheet surface；Another kind is in film and thin plate interlayer arrangement soft coating, serve as adapter, cooperate the vibration of two sides film or thin plate, in this measure, other than the material parameter of film and thin plate itself, structural parameters and the number of plies are adjustable, the material mixture ratio and thickness of adaptation layer also can according to need.
Description
Technical Field
The invention belongs to the technical field of acoustic superstructures, and particularly relates to a method for designing an acoustic superstructure modified by a coating.
Background
On the one hand, the advent of acoustic metamaterials has greatly expanded the research field of acoustic disciplines over the last 20 years. The peculiar acoustic parameters which are not possessed by natural materials such as dynamic negative mass density, negative volume modulus, zero refractive index and the like can be realized by introducing the acoustic resonance structure, and brand new freedom degree and more possibilities are brought for regulating and controlling sound waves. The artificial microstructure with the singular acoustic parameters is reasonably designed and realized, the theoretical limit of classical acoustics can be broken through, an acoustic material with new functions is constructed, and the innovation of acoustic devices is led. In recent five years, the acoustic super surface has received wide attention of people as a novel ultra-thin acoustic artificial structure, and compared with the acoustic super material structure provided in the past, the acoustic super surface has the advantages of being ultra-thin and planar, being capable of completely controlling acoustic wave front and the like. Specifically, the acoustic super surface is a sub-wavelength acoustic wave wavefront shaping device which is lower in thickness than the control wavelength by a plurality of orders of magnitude, can realize special physical phenomena such as perfect absorption, negative refraction, abnormal reflection, abnormal transmission, random wave front phase regulation and the like of acoustic waves, and has important application value in the aspects of low-frequency sound absorption, acoustic stealth cloak, acoustic auto-collimation, acoustic super lenses and the like.
On the other hand, the coating is a material which is not necessary for building decoration and engineering decoration, is convenient to apply and low in price, and plays an important role in industrial development and engineering practice. However, for acoustic waves, it is difficult to manipulate them with small sized substances due to their long wavelength. Thus, coatings, which are widely used in industrial development, are difficult to work in acoustics. It is envisaged that the acoustic performance of the structure can be manipulated flexibly if a thin layer of paint is applied, which will provide great convenience for acoustic manipulation in engineering practice. Therefore, how to introduce the coating into the acoustic structure to modify the acoustic structure becomes a technical problem that many material development enterprises hope to solve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for designing an acoustic superstructure modified by paint, which takes a film and a thin plate as a basic structure, so that the paint can regulate and modify sound waves by acting as an additional layer. To a large extent, this can be achieved by extending conventional industrial materials into acoustic designs.
The invention is realized by adopting the following technical scheme:
a design method of an acoustic superstructure modified by coating is characterized in that the coating is used as a component of an artificial composite structure, the modification of the acoustic performance of the artificial composite structure is realized by changing the proportioning parameters of the coating, and the design method is divided into a structure design method for realizing the acoustic performance modification by using the coating as a surface additional layer and a structure design method for realizing the acoustic performance modification by using the coating as an adaptive layer; wherein,
the structure design method for realizing the acoustic property modification by taking the coating as the surface additional layer adopts a film or a thin plate as a substrate structure, and realizes the acoustic property modification of the whole structure by arranging the coating on the surface of the substrate structure and using different coating parameters;
the structural design method for realizing the acoustic property modification by taking the coating as the adaptation layer adopts the film or the thin plate as the basic structure, and realizes the acoustic property modification of the whole structure by different coating parameters by arranging the coating between the two layers of films or thin plates.
The further improvement of the invention is that the structure design method for modifying the acoustic performance by using the coating as the surface additional layer specifically comprises the following steps:
101) designing and manufacturing a thin film or thin plate type structure as a basic structure according to actual needs;
102) determining the proportion of the coating, the coating thickness, the coating area and the design parameters of the coating position according to the requirements of sound wave regulation and control by taking a film or a thin plate in a basic structure as a substrate;
103) coating the coating on a substrate structure according to design parameters, and curing to form a solid coating;
104) and measuring the acoustic performance of the structure, and repeatedly adjusting the design parameters of the coating according to the expected acoustic performance until the design requirements are met.
The invention is further improved in that the method also comprises the following steps:
105) when the acoustic performance of the whole structure needs to be modified, coating parameters are additionally designed, the original coating is removed, and a new coating is coated to be cured into a new solid coating, so that the acoustic performance is modified.
The invention is further improved in that the acoustic performance of the integral artificial composite structure is modified by adjusting the design parameters of the coating, and the design parameters of the proportion, the coating thickness, the coating area and the coating position of the coating are adjusted according to the requirements.
The further improvement of the invention is that the structure design method for modifying the acoustic performance by using the coating as the adaptation layer specifically comprises the following steps:
201) designing and manufacturing a thin film or thin plate type structure as a basic structure according to actual needs;
202) determining the design parameters of the proportion, the coating thickness, the coating area and the coating position of the coating according to the requirement of sound wave regulation;
203) after being prepared separately, the coating layer is bonded with the base layers on the two sides, or the coating is directly coated on one of the base layers, and then the base layer on the other side is covered on the coating for curing;
204) and measuring the acoustic performance of the structure, and repeatedly adjusting the design parameters of the coating according to the expected acoustic performance until the design requirements are met.
The invention is further improved in that the method also comprises the following steps:
5) when the acoustic performance of the whole structure needs to be modified, coating parameters are additionally designed, the original coating is removed, and a new coating is coated to be cured into a new solid coating, so that the acoustic performance is modified.
The invention has the further improvement that the acoustic performance of the integral artificial composite structure is modified by adjusting the design parameters of the coating, and the design parameters of the proportion, the coating thickness, the coating area and the coating position of the coating are adjusted according to the requirement, so that the whole coating is a flexible layer.
The invention has the following beneficial technical effects:
1. by changing design parameters such as the proportion, the coating thickness, the coating area, the coating position and the like of the additional coating, the working frequency of the designed acoustic superstructure can be greatly moved to low frequency or high frequency according to requirements, and the amplitude of acoustic parameters such as sound insulation, sound absorption coefficient, reflection coefficient, transmission coefficient and the like can be adjusted;
2. by changing design parameters such as the proportion, the coating thickness, the coating area, the coating position and the like of the coating adaptation layer, double negative equivalent parameters and reflection phases can be adjusted and controlled randomly according to requirements;
3. by adopting a structural design method of taking the coating as an adaptation layer, a pure solid acoustic super-surface structure can be designed;
4. by changing the design parameters of the structure with the coating adaptation layer and designing a plurality of cellular structures according to the phase gradient requirement, the broadband acoustic stealth effect can be realized.
In summary, according to the above-mentioned characteristics of the acoustic superstructure design method by coating modification provided by the present invention, the present invention can overcome the disadvantages of the conventional materials, and realize the modification of the acoustic structure by different coating formulations. Because the coating is the most common material in buildings and engineering, abundant design can be realized by different proportions. The acoustic structure modification method provided by the invention is expected to be widely popularized in acoustic design of buildings and equipment.
Drawings
FIG. 1 is a basic structure diagram of a circular nylon thin plate belt mass block;
FIG. 2 is a structural diagram of a nylon sheet with a mass block with a polyamide coating layer having a thickness of 0.1mm on the surface;
FIG. 3 is a measurement of sound absorption coefficient with and without a coating structure;
FIG. 4 is a measurement of the sound insulation with or without the coating structure;
FIG. 5 is a calculated sound insulation for a structure when coatings of different moduli of elasticity are selected;
FIG. 6 is the results of the acoustic insulation calculation for the structure when coatings of different viscoelastic damping coefficients are selected;
FIG. 7 is the reflection coefficient calculation for a structure when coatings of different viscoelastic damping coefficients are selected;
FIG. 8 is a calculation of equivalent parameters for a sandwich composite plate structure with a coated adapter;
FIG. 9 is a schematic diagram of an acoustic cloak designed through an acoustic superstructure with a coated conforming layer;
FIG. 10 shows the phase profile calculation results for 4 different sets of designed reflection phase gradient structures;
fig. 11 shows the sound pressure field distribution calculation results in the case of the presence or absence of the canopy, in which the top row is the sound pressure field distribution in the absence of the canopy, and the bottom row is the phase distribution in the presence of the canopy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Coating is used as a surface additional layer to realize acoustic superstructure acoustic performance modification
The invention selects a circular rigid nylon plate structure with the diameter of 40mm as an embodiment, designs a sheet type acoustic metamaterial structure with a nylon sheet with the thickness of 0.2mm and an additional mass block, and the outer edge of the sheet is fixed by a polylactic acid plastic frame, as shown in figure 1. Wherein, the additional mass block is a stainless steel cylindrical block with the radius of 6mm and the thickness of 1 mm. Then, the invention designs a structure with an additional coating by adding a polyamide coating on the surface of the thin plate, as shown in the attached figure 2. A B & KType-4206T standard standing wave tube test system is adopted to measure the sound absorption coefficient and the sound insulation quantity of the two structures. The sound absorption coefficient measurement result is shown in figure 3, and the sound insulation quantity measurement result is shown in figure 4. From the sound absorption coefficient measurement results, the sound absorption peak frequency of the structure is shifted from 131Hz to 165Hz after a light coating is added on the surface of the thin plate, but the sound absorption coefficient amplitude is basically unchanged. This shows that, in this case, a layer of coating is added on the surface of the thin plate, so that the sound absorption frequency of the structure can be changed, and the obvious acoustic performance modification effect can be achieved. In addition, as can be seen from the sound insulation measurements, the addition of the coating can cause the frequency location of the first sound insulation valley (131 Hz and 165Hz, respectively) and the first sound insulation peak (1# structure between 416Hz and 516Hz, 2# structure 560Hz) of the structure to shift substantially to high frequencies. These results are sufficient to show that the acoustic properties of the sheet-like structure can be modified by the additional coating.
And further analyzing the influence rule of different coating parameters on the acoustic characteristics of the structure from a macroscopic view, and providing a basis for carrying out acoustic modification. For linear elastic sheets, there are four macroscopic material and structural parameters that can be used to alter the acoustic properties, i.e., mass density, thickness, elastic modulus, and damping. In fact, for thin sheets, once processed, these parameters are already established and it is difficult to modify them. The present invention thus provides a method for modifying a film or sheet by adding a coating. For coatings, these parameters can be varied by changing the formulation of the coating, where the effect of changes in coating parameters on the overall structure performance is analyzed by changing the modulus of elasticity of the coating. The elastic modulus of the coating in the model 2# above was changed from 2GPa to 16GPa, with additional sets of values of 4GPa, 8GPa, and 12GPa, respectively. The sound insulation curves of the five structures are calculated, as shown in fig. 5, and show that the frequency positions of the 1 st order sound insulation valleys and peaks and the corresponding sound insulation amplitudes increase with the increase of the elastic modulus of the coating. The physical reason for the change in frequency position is that as the modulus of elasticity of the coating increases, the overall stiffness of the entire structure increases, and the frequency is then red-shifted; the reason for the increase in the magnitude of the sound insulation with the increase in the elastic modulus of the coating is that the impedance of the entire structure increases, resulting in an increase in the reflection coefficient and hence an increase in the sound insulation. These results show that by varying the elastic parameters of the surface coating, the frequency and amplitude of the overall structure can be modified.
Next, the acoustic property modifying effect on the structure was analyzed by selecting different surface coating viscoelastic damping losses (10%, 20%, 40%, 60% and 100%, respectively). The sound insulation curves of the five structures are calculated and shown in figure 6, and the reflection coefficients are shown in figure 7. It can be seen from the figure that as viscoelastic damping increases from 10% to 100%, the frequency locations at the acoustic troughs and peaks are slightly red shifted. In fig. 6, the magnitude of the sound insulation at the sound insulation valleys increases with increasing damping, while the magnitude at the peaks decreases, which means that increasing the damping of the coating smoothes the sound insulation curve of the whole structure. Since the acoustic attenuation performance of these thin plate-type acoustic superstructures is mainly determined by reflection, it can be seen from fig. 7 that as the damping coefficient increases, the reflection coefficient also increases. This means that a surface coating with high damping helps to improve the acoustic reflection properties of the structure. The physical mechanism of the increase in the amount of sound reflection and sound insulation is that the resonance strength of the thin plate decreases with the increase in damping, and therefore the amplitude of vibration near the resonance frequency decreases, resulting in a decrease in sound transmission capability. In addition to thin sheet structures, thin film structures can also be modified for acoustic properties by the methods described above. In addition, in addition to the elastic parameters of the coating, modifying the acoustic properties of the structure can also be achieved by varying the thickness and density of the coating.
(II) the coating is used as an adaptation layer to realize the modification of the acoustic performance of the acoustic superstructure
In the following, how to modify the acoustic properties of the acoustic superstructure with a coating as an adaptation layer is explained by designing a sandwich structure as an embodiment. The structure is formed by arranging a soft coating between two hard thin plates, and the coating can adapt to the vibration of the thin plates on two sides through stretching deformation due to the adoption of the soft coating. Therefore, such a coating to accommodate both side sheets is called a coating adapter. Firstly, a group of circular composite sandwich composite sheet structures with the diameter of 100mm is designed, wherein the thickness of each of the two layers of sheets is 0.2mm, and the thickness of the coating adapter is 0.6 mm. The elastic modulus, Poisson's ratio and mass density of the sheet were selected to be 50GPa, 0.28 and 1000kg/m, respectively31KPa, 0.49 and 1000kg/m for the soft coating adapter, respectively3. By solving the dynamic equivalent parameters of the structure, the structure is shown in fig. 8, which shows that a double negative frequency band with simultaneous negative effective mass density and bulk modulus is realized in the range of 3452-. That is, by incorporating a coating between two sheets, this configuration can achieve double negative equivalent parameter acoustic properties.
The acoustic super-surface is expected to be widely applied to acoustic flat focusing super-penetration due to the characteristics of light weight and deep sub-wavelength thicknessMirror, auto-collimation, redirection, acoustic stealth, and the like. However, because the phase retardation provided by lightweight sheet or film structures is difficult to achieve 2 π span, it is difficult to use in wavefront phase modulation using previous design methods. Therefore, it is urgently necessary to introduce a new design method. Here, the present invention employs a sandwich composite sheet structure with a coated adapter that can achieve a continuous reflective phase shift covering the 2 pi range without any air cavity. Moreover, by designing a group of sandwich composite sheet structures with gradient distribution of reflection coefficients, an acoustic cloak capable of realizing acoustic stealth can be further designed. To illustrate how an acoustic cloak can be designed with a composite sheet structure with a coating adaptation layer, consider an isosceles triangle object to be clotted with a base length of 480mm and a height of 120 mm. A two-dimensional acoustic cloak is designed, the operating frequency is selected to be 1200Hz, 4 cells are respectively arranged on two hypotenuses of a triangle, and the total number of the cells is 8, and is marked as 1# to 8#, as shown in figure 9. Due to the bilateral symmetry, only phase compensation of 4 cells on one side needs to be designed. For the left 4 cells, the height from the center of the outer side of the front thin plate of each cell to the ground is hiThe phase compensation corresponding to each cell can be obtained by the following relationship
δi＝π-2k0hicosθ (1)
In the formula, k02 pi/λ is the wavevector in air, λ is the steering wavelength.
For the 4 cells designed, the heights are 20.5mm,47.3mm,74.2mm, and 101mm, respectively, and the corresponding phase offsets are 2.24rad, 1.06rad, -0.12rad, -1.3rad, respectively. The width of the thin plate is 40mm, the thicknesses of the two thin plates and the middle coating layer are both 0.2mm, and a mounting distance of 4.4mm is reserved between the rear plate and the object to be concealed. To simplify the design, the reflective phase adjustment is performed by changing the young's modulus of the sheet, keeping the material parameters of the intermediate coating constant. The elastic modulus of the 1# and 8# cells was 88.4GPa, the elastic modulus of the 2# and 7# cells was 85.2GPa, the elastic modulus of the 3# and 6# cells was 81GPa, and the elastic modulus of the 4# and 5# cells was 62 GPa. Firstly, the reflection phase of each unit cell under vertical incidence is solved by adopting Comsol software, and the obtained phases of 4 unit cells are shown in the attached figure 10. And then establishing a calculation model according to the designed cellular structure, wherein the calculation model comprises a model without a cloak and a model with the cloak. The calculated sound pressure field distribution is shown in fig. 11. It can be seen that within the wide band of 1000Hz to 4000Hz, the sound pressure distribution field of the structure with the cloak can always keep a plane wave sound field, and the scattering of the structure without the cloak is very obvious. This means that the acoustic super-surface structure is designed to have a broadband canopy performance. Since the designed structure thickness is only 0.6mm, corresponding to 1/476 for the manipulation wavelength, the sub-wavelength level is very high.
According to the data, the technical effects which can be achieved by the invention are as follows:
1. by changing design parameters such as the proportion, the coating thickness, the coating area, the coating position and the like of the additional coating, the working frequency of the designed acoustic superstructure can be greatly moved to low frequency or high frequency according to requirements, and the amplitude of acoustic parameters such as sound insulation, sound absorption coefficient, reflection coefficient, transmission coefficient and the like can be adjusted;
2. by changing design parameters such as the proportion, the coating thickness, the coating area, the coating position and the like of the coating adaptation layer, double negative equivalent parameters and reflection phases can be adjusted and controlled randomly according to requirements;
3. by adopting a structural design method of taking the coating as an adaptation layer, a pure solid acoustic super-surface structure can be designed;
4. by changing the design parameters of the structure with the coating adaptation layer and designing a plurality of cellular structures according to the phase gradient requirement, broadband acoustic stealth can be realized.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications can be made without departing from the inventive concept, and such modifications are intended to be included within the scope of the present invention.
Claims (7)
1. A design method of an acoustic superstructure modified by coating is characterized in that the method takes the coating as a component of an artificial composite structure, realizes the modification of the acoustic performance of the artificial composite structure by changing the proportioning parameter of the coating, and is divided into a structure design method for realizing the modification of the acoustic performance by taking the coating as a surface additional layer and a structure design method for realizing the modification of the acoustic performance by taking the coating as an adaptation layer; wherein,
the structure design method for realizing the acoustic property modification by taking the coating as the surface additional layer adopts a film or a thin plate as a substrate structure, and realizes the acoustic property modification of the whole structure by arranging the coating on the surface of the substrate structure and using different coating parameters;
the structural design method for realizing the acoustic property modification by taking the coating as the adaptation layer adopts the film or the thin plate as the basic structure, and realizes the acoustic property modification of the whole structure by different coating parameters by arranging the coating between the two layers of films or thin plates.
2. The method for designing an acoustic superstructure modified by coating material according to claim 1, wherein the method for designing a structure with coating material as additional surface layer to modify acoustic properties comprises the following steps:
101) designing and manufacturing a thin film or thin plate type structure as a basic structure according to actual needs;
102) determining the proportion of the coating, the coating thickness, the coating area and the design parameters of the coating position according to the requirements of sound wave regulation and control by taking a film or a thin plate in a basic structure as a substrate;
103) coating the coating on a substrate structure according to design parameters, and curing to form a solid coating;
104) and measuring the acoustic performance of the structure, and repeatedly adjusting the design parameters of the coating according to the expected acoustic performance until the design requirements are met.
3. The method of claim 2, further comprising the steps of:
105) when the acoustic performance of the whole structure needs to be modified, coating parameters are additionally designed, the original coating is removed, and a new coating is coated to be cured into a new solid coating, so that the acoustic performance is modified.
4. The method of claim 2, wherein the acoustic properties of the integrated artificial composite structure are modified by adjusting design parameters of the coating, and the design parameters of the coating ratio, coating thickness, coating area and coating position are adjusted as required.
5. The method for designing an acoustic superstructure modified by a coating material according to claim 1, wherein the method for designing a structure using a coating material as an adaptation layer to modify acoustic properties comprises the following steps:
201) designing and manufacturing a thin film or thin plate type structure as a basic structure according to actual needs;
202) determining the design parameters of the proportion, the coating thickness, the coating area and the coating position of the coating according to the requirement of sound wave regulation;
203) after being prepared separately, the coating layer is bonded with the base layers on the two sides, or the coating is directly coated on one of the base layers, and then the base layer on the other side is covered on the coating for curing;
204) and measuring the acoustic performance of the structure, and repeatedly adjusting the design parameters of the coating according to the expected acoustic performance until the design requirements are met.
6. An acoustic superstructure design method by coating modification according to claim 5, characterized by further comprising the steps of:
5) when the acoustic performance of the whole structure needs to be modified, coating parameters are additionally designed, the original coating is removed, and a new coating is coated to be cured into a new solid coating, so that the acoustic performance is modified.
7. The method for designing an acoustic superstructure modified by coating according to claim 5, wherein the acoustic performance of the whole artificial composite structure is modified by adjusting the design parameters of the coating, and the design parameters of the coating ratio, the coating thickness, the coating area and the coating position are adjusted as required to ensure that the whole coating is a flexible layer.
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| CN110808023A (en) * | 2019-11-18 | 2020-02-18 | 苏州大学 | Omnidirectional sound absorption material and device suitable for fluid and preparation method |
| CN110944501A (en) * | 2019-12-10 | 2020-03-31 | 哈尔滨工程大学 | Protection device applied to thermoelectric double fields |
| CN112863471A (en) * | 2021-01-14 | 2021-05-28 | 湖北航鹏化学动力科技有限责任公司 | Sound insulation device |
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Application publication date: 20190830 |