CN112699561A - Oil-filled triple-period minimum curved surface sound insulation structure and preparation method thereof - Google Patents
Oil-filled triple-period minimum curved surface sound insulation structure and preparation method thereof Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 239000012790 adhesive layer Substances 0.000 claims abstract description 21
- 239000003921 oil Substances 0.000 claims description 51
- 238000013016 damping Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000008719 thickening Effects 0.000 claims description 4
- 239000010688 mineral lubricating oil Substances 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 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
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Abstract
The invention discloses an oil-filled triple-period minimum curved surface sound insulation structure and a preparation method thereof, wherein the oil-filled triple-period minimum curved surface sound insulation structure comprises an upper panel, an upper adhesive layer, a sandwich, a lower adhesive layer, a lower panel, a peripheral closing plate, a peripheral adhesive layer and viscous oil, the sandwich comprises triple-period minimum curved surfaces, the upper panel is adhered to the upper interface of the sandwich through the upper adhesive layer, the lower panel is adhered to the lower interface of the sandwich through the lower adhesive layer, the peripheral closing plate is adhered to the side surface of the sandwich through the peripheral adhesive layer, the upper panel, the lower panel and the peripheral closing plate form a closed space, the viscous oil is filled in the closed space, and the structure of the sandwich is determined by a mathematical formula for defining the triple-period minimum curved surfaces, a mathematical formula for defining the whole shape dividing. The upper panel and the lower panel are manufactured, the lower interface of the lower panel and the sandwich is firstly bonded, then the peripheral closing plate is bonded on the side surface of the sandwich, viscous oil is filled after the peripheral closing plate is stabilized, and finally the upper panel is bonded on the upper interface of the sandwich.
Description
Technical Field
The invention relates to the technical field of light sound insulation structures, in particular to an oil-filled triple-period extremely-small curved surface sound insulation structure and a preparation method thereof.
Background
With the development of science and technology, noise has greater influence on the life of people, and the importance of noise suppression is more and more prominent. The light sandwich structure has the advantages of high specific rigidity, high specific strength, light weight and the like, and is widely applied to the modern carrying field with high requirements on light weight and sound insulation. However, when the traditional light sandwich structure, such as a honeycomb sandwich plate, is applied to sound insulation, the sound insulation effect is often affected due to the fact that a structural resonance phenomenon causes a large-frequency-band sound insulation valley to appear in an important sound insulation section. And this patent novel sound insulation structure pours into viscous oil liquid on minimum curved surface sandwich structure's basis, can reduce the sound insulation valley influence frequency channel when the structure resonates through viscous fluid's damping effect, when keeping rigidity big and the quality light, promotes the sound insulation performance of the sensitive 2000 of people's ear with other drugs 4000Hz frequency channel by a wide margin.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an oil-filled triple-period extremely-small curved surface sound insulation structure, which is filled with viscous oil on the basis of high rigidity and light weight to further improve the sound insulation performance of the structure during resonance.
The invention also aims to provide a preparation method of the oil-filled triple-period extremely-small curved surface sound insulation structure.
The technical scheme of the invention is as follows: the sandwich comprises the triple-period minimum curved surface, the upper panel is adhered to the upper interface of the sandwich through the upper adhesive layer, the lower panel is adhered to the lower interface of the sandwich through the lower adhesive layer, the peripheral closing plate is adhered to the side surface of the sandwich through the peripheral adhesive layer, the upper panel, the lower panel, the peripheral closing plate and the sandwich jointly form a closed space, the viscous oil liquid is filled in the closed space, and the structure of the sandwich is determined by a mathematical formula for defining the triple-period minimum curved surface, a mathematical formula for defining the whole shape division area of the sandwich and the thickness of the curved surface.
The mathematical formula for defining the triple-period minimum curved surface is as follows:
cosaπx+cosaπy+cosaπz＝b
in the formula, the parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, and the parameter b determines the degree of deviation of the minimum curved surface from the original minimum curved surface.
Viscous oil is poured into the closed space, the structure is absorbed to vibrate, damping is increased to reduce a sound insulation valley frequency band caused by resonance, and sound insulation performance is improved through fluid-solid coupling.
The viscous oil is glycerol, mineral oil or lubricating oil
A preparation method of an oil-filled triple-period minimum curved surface sound insulation structure comprises the following steps:
using three-dimensional modeling software, obtaining a boundary curve formula of the minimum curved surface according to a mathematical formula defining the triple-period minimum curved surface, building a boundary curve through equation driving, filling the boundary curve into the curved surface, mirroring for multiple times to obtain a single-cell curved surface model, thickening the single-cell curved surface model, finally arraying into a required size to obtain an entity model of the sandwich, and then manufacturing the sandwich;
simultaneously, establishing an upper panel entity model and a lower panel entity model in modeling software, establishing a peripheral enclosing panel entity model according to a boundary curve, and manufacturing a peripheral enclosing panel, an upper panel and a lower panel;
the lower interface of the lower panel and the sandwich is firstly bonded, then the peripheral closing plate is bonded on the side surface of the sandwich, after the sandwich is stabilized, the viscous oil is poured in, and finally the upper panel is bonded on the upper interface of the sandwich.
The mathematical formula for defining the triple-period minimum curved surface is as follows:
cosaπx+cosaπy+cosaπz＝b
in the formula, the parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, and the parameter b determines the degree of deviation of the minimum curved surface from the original minimum curved surface.
The minimum curved surface is a periodic symmetrical curved surface, 1/8 curved surfaces are firstly established, then a complete single cell with the minimum curved surface is obtained through three times of mirror image, and finally the single cell is thickened.
The modeling process of the peripheral sealing plate is as follows: and establishing a boundary curve of the minimum curved surface by defining a mathematical formula driving curve of the triple-period minimum curved surface, and stretching the boundary curve after offsetting to obtain the peripheral sealing plate.
The principle of the triple-period minimum curved surface sound insulation structure filled with oil is as follows: the novel light sandwich structure based on the minimum curved surface can increase the damping effect of an air layer or a viscous oil liquid layer in the middle of the interlayer due to the unique geometrical topological configuration of the novel light sandwich structure. The incident sound waves generate vibration in the upper panel excitation structure, when the sandwich structure vibrates, the sound waves can be radiated to the middle air layer, and the radiated sound waves can be diffracted, reflected and transmitted in the middle air layer to excite the structure vibration in the transmission process. Compared with the traditional sandwich structure, the unique configuration of the extremely-small curved surface sandwich can exert the sound vibration coupling effect to a greater extent, and further improve the damping effect of the middle layer. The damping effect is increased, so that the damping effect during the structural resonance can be improved, the amplitude of the sandwich resonance is reduced, the frequency range of a sound insulation valley caused by the resonance is further reduced, and the sound insulation performance is improved.
Compared with the prior art, the invention has the following beneficial effects:
the structure adopts a triple-period extremely-small curved surface solid structure as a sandwich, and partial viscous oil is filled into a space formed by an upper plate, a lower plate and a peripheral sealing plate to form a novel solid-liquid coupling sound insulation structure to absorb the vibration of the structure; the solid-liquid coupling structure has the characteristic of high specific stiffness, can reduce the sound insulation valley frequency width by means of the consumption of vibration energy by viscous oil, and integrally and greatly improves the sound insulation performance of the most sensitive middle and low frequency bands of human ears.
The extremely small curved surface strictly defined based on a mathematical formula belongs to a periodic thin-wall structure and has larger specific rigidity than a common sandwich structure; the unique configuration of sandwich structure can increase the damping effect in intermediate level, can increase the damping after pouring into viscous fluid and to the suppression of amplitude when resonating, amplitude when having reduced the resonance, and then dwindle the frequency channel that the sound insulation performance that resonance leads to reduces, consequently has more stable sound insulation performance and efficient sound insulation performance than general sandwich structure.
Drawings
FIG. 1 is a cross-sectional view of a light sound insulation sandwich structure with a triple-period minimum curved surface filled with oil. Wherein, 1, 4, 6 and 7 are respectively bonded together through 2, 3 and 5 to form a closed space and filled with viscous oil liquid 8.
FIG. 2 is a diagram showing a unit cell of a triple period minimum curved surface used in the light sound insulation sandwich structure with a triple period minimum curved surface filled with oil.
FIG. 3 is a modeling method of a sandwich core in the triple-period minimum-curved-surface light sound insulation sandwich structure filled with oil.
FIG. 4 is a modeling method of an outer enclosure plate in the light sound insulation sandwich structure with the triple-period minimum curved surface filled with oil.
FIG. 5 is a sound insulation simulation diagram of the triple-period extremely-small curved surface light sound insulation sandwich structure filled with oil, wherein the structure contains three unit cells.
In the figure, 1 is an upper panel, 2 is an upper cementing layer, 3 is a peripheral cementing layer, 4 is a peripheral closing plate, 5 is a lower cementing layer, 6 is a lower panel, 7 is a sandwich core, and 8 is viscous oil.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Examples
The oil-filled triple-period minimum curved surface sound insulation structure comprises an upper panel 1, an upper adhesive layer 2, a sandwich 7, a lower adhesive layer 5, a lower panel 6, a peripheral closing plate 4, a peripheral adhesive layer 3 and viscous oil 8, wherein the sandwich comprises triple-period minimum curved surfaces, the upper panel is bonded with the upper interface of the sandwich through the upper adhesive layer, the lower panel is bonded with the lower interface of the sandwich through the lower adhesive layer, the peripheral closing plate is bonded with the side surface of the sandwich through the peripheral adhesive layer, the upper panel, the lower panel, the peripheral closing plate and the sandwich form a closed space together, the viscous oil is filled in the closed space, and the structure of the sandwich is determined by a mathematical formula for defining the triple-period minimum curved surfaces, a formula for defining the integral shape area of the sandwich and the thickness of the curved surfaces together. The viscous oil can be glycerol, mineral oil or lubricating oil. The materials of the upper panel, the lower panel, the peripheral sealing plate and the core may be metals or non-metals such as polymers, and the embodiment is not limited.
The mathematical formula for defining the triple-period minimum curved surface is as follows:
cosaπx+cosaπy+cosaπz＝b
in the formula, the parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, and the parameter b determines the degree of deviation of the minimum curved surface from the original minimum curved surface.
A method for preparing an oil-filled triple-period extremely-small curved-surface sound insulation structure, as shown in fig. 3 and 4, comprises the following steps:
using three-dimensional modeling software, obtaining a boundary curve formula of the minimum curved surface according to a mathematical formula defining the triple-period minimum curved surface, building a boundary curve through equation driving, filling the boundary curve into the curved surface, mirroring for multiple times to obtain a single-cell curved surface model, thickening the single-cell curved surface model, finally arraying into a required size to obtain an entity model of the sandwich, and then manufacturing the sandwich;
simultaneously, establishing an upper panel entity model and a lower panel entity model in modeling software, establishing a peripheral enclosing panel entity model according to a boundary curve, and manufacturing a peripheral enclosing panel, an upper panel and a lower panel;
firstly, the lower interface of the lower panel and the sandwich is bonded, then the peripheral sealing plate is bonded on the side surface of the sandwich, after the sandwich is stabilized, viscous oil is poured, and finally the upper panel is bonded on the upper interface of the sandwich to form the novel fluid-solid coupling light sandwich structure.
In order to realize the manufacturing process, the modeling method of the extremely-small curved surface solid sandwich specifically comprises the following steps:
because the extremely-small curved surface is a continuous smooth curved surface strictly defined by a mathematical formula, the three-dimensional definition domain of the extremely-small curved surface is infinite, namely the extremely-small curved surface can be infinitely and periodically repeated in three directions, and the mathematical expression of the extremely-small curved surface can be accurately represented by the following formula:
cosaπx+cosaπy+cosaπz＝b
in the formula, a parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, b parameter determines the deviation degree of the minimum curved surface from the original minimum curved surface, and b parameter of the original minimum curved surface is 0. The value a is 0.1, and the repetition period of the extremely small curved surface can be regulated to be 20 mm.
Based on the above formula, it can be seen that the P-type extremely small curved surface is not only an infinite periodically repeating curved surface but also a periodically symmetrical curved surface. Therefore, only the 1/8 curved surface needs to be established during modeling, and the complete extremely-small curved surface unit cell can be obtained through three times of mirroring. The modeling flow of the three-dimensional modeling software is shown in fig. 3 and 4, and the boundary curve of the extremely small curved surface is firstly determined 1/8, and the curve can be derived by a mathematical formula: as can be seen from the periodically repeated conditions, it is only necessary to establish boundary curves on six planes, i.e., x, y, z are equal to 0 and 10, and fill 1/8 minimum curved surfaces, i.e., the equation for 6 boundary curves can be obtained by substituting the above equations with z being equal to 0 and the above conditions, and then substituting the above equations with z being equal to 0 and the above conditions
cos0.1πx+cos0.1πy+1＝0
Is simple and easy to obtain
y＝10×arccos(-1-cos(0.1πx))÷π
And (3) drawing in a program-driven curve in modeling software, respectively drawing 6 curves, wherein the 6 curves are connected end to end, and 1/8 tiny curved surfaces can be filled by using the 6 boundary curves. 1/8 the tiny curved surface is mirrored in the x, y and z directions at the boundary to obtain a complete tiny curved surface unit cell, and the unit cell is thickened by 1mm to obtain a tiny curved surface solid sandwich. The thickening function is that the minimum curved surface is a curved surface, and an entity material is needed in practical application, so that the entity of the minimum curved surface can be obtained by shifting the curved surface without thickness by a certain value along the normal direction. The modeling process of the peripheral closing plate is shown in figure 4, firstly, a boundary curve of a tiny curved surface is established through the equation driving curve, and since the tiny curved surface entity is thickened and deviated, the peripheral closing plate also needs to be processed in an equidistant mode to be matched with the size of the tiny curved surface entity sandwich, finally, the deviated curve is stretched to obtain the peripheral closing plate, and all models of the novel light sandwich structure can be established through the process.
The principle of the triple-period minimum curved surface sound insulation structure filled with oil is as follows: the novel light sandwich structure based on the minimum curved surface can increase the damping effect of an air layer or a viscous oil liquid layer in the middle of the interlayer due to the unique geometrical topological configuration of the novel light sandwich structure. The incident sound waves generate vibration in the upper panel excitation structure, when the sandwich structure vibrates, the sound waves can be radiated to the middle air layer, and the radiated sound waves can be diffracted, reflected and transmitted in the middle air layer to excite the structure vibration in the transmission process. Compared with the traditional sandwich structure, the unique configuration of the extremely-small curved surface sandwich can exert the sound vibration coupling effect to a greater extent, and further improve the damping effect of the middle layer. The damping effect is increased, so that the damping effect during the structural resonance can be improved, the amplitude of the sandwich resonance is reduced, the frequency range of a sound insulation valley caused by the resonance is further reduced, and the sound insulation performance is improved.
FIG. 5 is a simulation comparison diagram of a novel light sound insulation sandwich structure filled with viscous oil and air and having a single cell with a very small curved surface. As can be seen from the figure, the damping effect of the viscous oil liquid is larger when the structure vibrates, and the frequency range of the sound insulation performance reduction caused by the structure resonance of the minimum curved surface sandwich structure filled with the viscous oil liquid is smaller than that of the sandwich structure not filled with the viscous oil liquid, so that the sound insulation performance of the structure filled with the viscous oil liquid is improved when the structure resonates, and particularly in the middle frequency range of 2000 plus 4000Hz sensitive to human ears, the sound insulation performance of the structure filled with the viscous oil liquid is higher than the average sound insulation performance of the viscous oil liquid by more than 20dB and reaches the high sound insulation quantity of 60dB, and the viscous oil liquid has strong application potential in heavy projects such as aerospace, high-speed.
As mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (8)
1. The oil-filled triple-period minimum curved surface sound insulation structure is characterized by comprising an upper panel, an upper adhesive layer, a sandwich, a lower adhesive layer, a lower panel, a peripheral closing plate, a peripheral adhesive layer and viscous oil, wherein the sandwich comprises the triple-period minimum curved surface, the upper panel is adhered to the upper interface of the sandwich through the upper adhesive layer, the lower panel is adhered to the lower interface of the sandwich through the lower adhesive layer, the peripheral closing plate is adhered to the side surface of the sandwich through the peripheral adhesive layer, the upper panel, the lower panel, the peripheral closing plate and the sandwich jointly form a closed space, the viscous oil is filled in the closed space, and the structure of the sandwich is jointly determined by a mathematical formula for defining the triple-period minimum curved surface, a mathematical formula for defining the whole shape of the sandwich to divide an area and the thickness of the curved surface.
2. The oil-filled triple-period minimum curved surface sound insulation structure according to claim 1, wherein the mathematical formula for defining the triple-period minimum curved surface is as follows:
cosaπx+cosaπy+cosaπz＝b
in the formula, the parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, and the parameter b determines the degree of deviation of the minimum curved surface from the original minimum curved surface.
3. The oil-filled triple-period curved surface sound insulation structure as claimed in claim 1, wherein viscous oil is poured into a closed space to absorb structural vibration, so that damping is increased to reduce sound insulation valley frequency band caused by resonance, and sound insulation performance is improved through fluid-solid coupling.
4. The oil-filled triple-period curved surface sound insulation structure as claimed in claim 1, wherein the viscous oil is glycerol, mineral oil or lubricating oil.
5. The method for preparing the oil-filled triple period extremely-small curved surface sound insulation structure according to any one of claims 1 to 4, which is characterized by comprising the following steps:
using three-dimensional modeling software, obtaining a boundary curve formula of the minimum curved surface according to a mathematical formula defining the triple-period minimum curved surface, building a boundary curve through equation driving, filling the boundary curve into the curved surface, mirroring for multiple times to obtain a single-cell curved surface model, thickening the single-cell curved surface model, finally arraying into a required size to obtain an entity model of the sandwich, and then manufacturing the sandwich;
simultaneously, establishing an upper panel entity model and a lower panel entity model in modeling software, establishing a peripheral enclosing panel entity model according to a boundary curve, and manufacturing a peripheral enclosing panel, an upper panel and a lower panel;
the lower interface of the lower panel and the sandwich is firstly bonded, then the peripheral closing plate is bonded on the side surface of the sandwich, after the sandwich is stabilized, the viscous oil is poured in, and finally the upper panel is bonded on the upper interface of the sandwich.
6. The method for preparing the oil-filled sound insulation structure with the triple-period minimum curved surface according to claim 5, wherein the mathematical formula for defining the triple-period minimum curved surface is as follows:
cosaπx+cosaπy+cosaπz＝b
in the formula, the parameter a determines the unit cell size and the period of the minimum curved surface, the period value is T2/a, and the parameter b determines the degree of deviation of the minimum curved surface from the original minimum curved surface.
7. The preparation method of the oil-filled triple-period minimum-curved-surface sound insulation structure according to claim 5, wherein the minimum curved surface is a periodically symmetrical curved surface, an 1/8 curved surface is firstly established, then a complete minimum-curved-surface unit cell is obtained through three mirror images, and finally the unit cell is thickened.
8. The method for preparing the oil-filled triple-period curved surface sound insulation structure is characterized in that the modeling process of the peripheral closing plate is as follows: and establishing a boundary curve of the minimum curved surface by defining a mathematical formula driving curve of the triple-period minimum curved surface, and performing offset stretching on the boundary curve to obtain the peripheral sealing plate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114560063A (en) * | 2022-02-28 | 2022-05-31 | 重庆大学 | Gyroid structure-based aircraft base with noise elimination performance and manufacturing method thereof |
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Application publication date: 20210423 |