CN213934895U - Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure - Google Patents
Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure Download PDFInfo
- Publication number
- CN213934895U CN213934895U CN202120158607.8U CN202120158607U CN213934895U CN 213934895 U CN213934895 U CN 213934895U CN 202120158607 U CN202120158607 U CN 202120158607U CN 213934895 U CN213934895 U CN 213934895U
- Authority
- CN
- China
- Prior art keywords
- dielectric elastomer
- honeycomb
- honeycomb core
- intermediate layer
- elastomer film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229920002595 Dielectric elastomer Polymers 0.000 title claims abstract description 70
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 41
- 230000000694 effects Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 17
- 239000011229 interlayer Substances 0.000 description 13
- 230000005684 electric field Effects 0.000 description 8
- 230000014509 gene expression Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000012814 acoustic material Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 acryl rings Chemical group 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model relates to an adjustable dielectric elastomer intermediate layer honeycomb-microperforated panel structure, include top panel and lower panel and press from both sides the honeycomb core between top panel and lower panel, the top panel is the microperforated panel, a serial communication port, the honeycomb core includes honeycomb core and lower honeycomb core, go up the honeycomb core and be provided with dielectric elastomer film intermediate layer down between the honeycomb core, be provided with flexible electrode on the dielectric elastomer film intermediate layer and draw forth by the wire, exert different voltages through the wire to dielectric elastomer film intermediate layer and make dielectric elastomer film intermediate layer be in different stress state. The utility model can adjust the sound absorption peak value of the structure corresponding to the middle and low frequency bands according to the actual requirement to achieve the best noise reduction effect; the utility model relates to a method is simple, when guaranteeing structure light, only needs periodic addition sandwich structure have better sound absorption effect.
Description
Technical Field
The utility model belongs to the improved design of a honeycomb-micro perforated plate structure, in particular to an adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure and a design method.
Background
As a special composite material structure, the honeycomb sandwich structure has the advantages of light weight, high specific gravity, designability of performance and good sound insulation and noise reduction performance, and is widely applied to the industrial fields of aerospace and the like. The traditional honeycomb sandwich structure is composed of a thin upper panel, a thin lower panel and a thick honeycomb sandwich layer in the middle, and the traditional structure has a good sound insulation effect at medium and high frequencies and is not obvious enough in the medium and low frequency sound absorption effect of the structure. In order to improve the medium and low frequency sound absorption effect of the honeycomb sandwich structure, the main method at the present stage is to add sound absorption foam in the honeycomb sandwich or adopt a honeycomb-micro perforated plate combined structure and an active control technology. Although the sound absorption effect of the medium and low frequency is improved to a certain extent, the sound absorption frequency cannot be adjusted.
The frequency of sound absorption that the honeycomb-microperforated panel structure can be targeted at after its parameters have been determined. Thus, the sound absorption frequency band of the whole structure cannot be adjusted. The film can have a good noise absorption effect by utilizing a resonance sound absorption principle. The dielectric elastomer film has super large deformation, super fast response speed, high fatigue life and better electro-deformability, and the stress state in the film can be changed by utilizing the electro-deformability of the dielectric elastomer, so that the sound absorption frequency of the film is changed, and further the sound absorption frequency band of the honeycomb-micro perforated plate structure with the film interlayer is adjusted.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it places at honeycomb-microperforated plate structure middle part to have designed one kind to send deformable film intermediate layer of electricity on the honeycomb-microperforated plate structure basis improvement of basis, can adjust the internal stress of film intermediate layer through exerting voltage to the structure lead wire to reach the effect of the sound absorption frequency band of adjustment honeycomb-microperforated plate structure, promote the whole performance of making an uproar of falling of honeycomb-microperforated plate structure.
The utility model discloses a following technical scheme realizes.
The utility model provides an adjustable dielectric elastomer intermediate layer honeycomb-microperforated panel structure, includes top panel and lower panel and presss from both sides the honeycomb core between top panel and lower panel, the top panel is the microperforated panel, its characterized in that, the honeycomb core includes honeycomb core and lower honeycomb core, go up the honeycomb core and be provided with dielectric elastomer film intermediate layer down between the honeycomb core, be provided with flexible electrode on the dielectric elastomer film intermediate layer and draw forth by the wire, exert different voltages through the wire to dielectric elastomer film intermediate layer and make dielectric elastomer film intermediate layer be in different stress state.
Preferably, the honeycomb core is a cylindrical close-packed honeycomb core structure.
Preferably, the dielectric elastomer film interlayer is fixed between the upper honeycomb core and the lower honeycomb core by acrylic rings.
Preferably, seven honeycomb cores are taken as a whole, and the flexible electrodes are arranged on the dielectric elastomer film interlayers of only three adjacent honeycomb cores.
Preferably, the centers of the three honeycomb cores provided with the flexible electrodes are in the shape of an equilateral triangle.
A design method of an adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure comprises the following design steps: after voltage is applied to the upper surface and the lower surface of the dielectric elastomer film, electric fields are generated on the upper surface and the lower surface of the film, the thickness of the film is reduced under the action of the electric field force, and the internal stress is reduced;
dielectric elastomer film internal thickness direction stress sigmazThe expression is as follows:
wherein epsilon0＝8.85×10-12F/m is the vacuum dielectric constant,. epsilonrIs relative dielectric constant, V is voltage magnitude, and h is film thickness;
dielectric elastomer film internal in-plane stress σx，σyExpression formulaComprises the following steps:
wherein sigma0Pre-stressing a dielectric elastomer film;
the corresponding equivalent film tensions were:
the strain in the thickness direction of the dielectric elastomeric material can be written as:
wherein Y is the elastic modulus of the dielectric elastomer material and E ═ V/h is the applied electric field strength;
as can be seen from the expressions (1) to (4), when other parameters are not changed, the thickness of the dielectric elastomer film becomes thinner as the voltage on the film increases, the in-plane stress decreases, and the equivalent film tension decreases; considering that the film tension is an important parameter of film acoustic materials, the change of the tension has great influence on the sound absorption frequency of the film, and the sound absorption frequency band of the whole structure can be dynamically adjusted by utilizing the dielectric elastomer film;
the sound absorption of film is based on resonance principle, and the sound absorption frequency band is relevant with self resonant frequency, and the resonant frequency of film is:
as shown in formula 5, the resonance frequency of the film is related to the tension, and the tension of the film after electrification is T in formula 31Shown, substituting equation 5 yields:
from the formula 5, it is known that when voltage exists on the upper and lower surfaces of the dielectric elastomer film, the dielectric elastomer film expands under the action of the electric field force, the corresponding film prestress is reduced, the natural frequency of the dielectric elastomer film is reduced, and thus the sound absorption band shifts to a low frequency.
Compared with the prior art, the utility model has the advantages that:
1. the utility model can adjust the sound absorption peak value of the structure corresponding to the middle and low frequency bands according to the actual requirement to achieve the best noise reduction effect;
2. the utility model relates to a method is simple, when guaranteeing structure light, only needs periodic addition sandwich structure have better sound absorption effect.
Drawings
FIG. 1 is a schematic view of a honeycomb-microperforated panel construction;
FIG. 2 is a honeycomb-microperforated plate cell structure with a sandwich of dielectric elastomer films;
FIG. 3 is a honeycomb-microperforated plate monolith with a dielectric elastomer film sandwich;
FIG. 4 is a top view of a circular honeycomb-microperforated panel structure;
FIG. 5 is a top view of a honeycomb-microperforated panel with a membrane sandwich unit;
FIG. 6 is a graph of the results of an example structural sound absorption experiment;
in the figure: 1. the structure comprises an upper panel, 2, a honeycomb core, 3, a lower panel, 4, a dielectric elastomer film interlayer, 5, a flexible electrode, 6 and a lead; 201. upper honeycomb core, 202, lower honeycomb core.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
As shown in fig. 1 to 6, an adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure comprises an upper panel 1, a lower panel 3 and a honeycomb core 2 sandwiched between the upper panel 1 and the lower panel 3, wherein the upper panel 1 is a micro perforated panel, and is characterized in that the honeycomb core 2 comprises an upper honeycomb core 201 and a lower honeycomb core 202, a dielectric elastomer film sandwich layer 4 is arranged between the upper honeycomb core 201 and the lower honeycomb core 202, a flexible electrode 5 is arranged on the dielectric elastomer film sandwich layer 4 and is led out by a lead 6, and different voltages are applied to the dielectric elastomer film sandwich layer 4 through the lead 6 to enable the dielectric elastomer film sandwich layer 4 to be in different stress states.
As a preferred embodiment, the honeycomb core 2 is a cylindrical, close-packed honeycomb core structure.
As a preferred embodiment, the dielectric elastomer film sandwich 4 is fixed between the upper honeycomb core 201 and the lower honeycomb core 202 by acryl rings.
In a preferred embodiment, seven honeycomb cores 2 are taken as a whole, and the flexible electrodes 5 are arranged on the dielectric elastomer film interlayers 4 of only three adjacent honeycomb cores 2.
As a preferred embodiment, the centers of the three honeycomb cores 2 provided with the flexible electrodes 5 are in the shape of an equilateral triangle.
A design method of an adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure comprises the following design steps: after voltage is applied to the upper surface and the lower surface of the dielectric elastomer film, electric fields are generated on the upper surface and the lower surface of the film, the thickness of the film is reduced under the action of the electric field force, and the internal stress is reduced;
dielectric elastomer film internal thickness direction stress sigmazThe expression is as follows:
wherein epsilon0＝8.85×10-12F/m is the vacuum dielectric constant,. epsilonrIs relative dielectric constant, V is voltage magnitude, and h is film thickness;
dielectric elastomer film internal in-plane stress σx，σyThe expression is as follows:
wherein sigma0Pre-stressing a dielectric elastomer film;
the corresponding equivalent film tensions were:
the strain in the thickness direction of the dielectric elastomeric material can be written as:
wherein Y is the elastic modulus of the dielectric elastomer material and E ═ V/h is the applied electric field strength;
as can be seen from the expressions (1) to (4), when other parameters are not changed, the thickness of the dielectric elastomer film becomes thinner as the voltage on the film increases, the in-plane stress decreases, and the equivalent film tension decreases; considering that the film tension is an important parameter of film acoustic materials, the change of the tension has great influence on the sound absorption frequency of the film, and the sound absorption frequency band of the whole structure can be dynamically adjusted by utilizing the dielectric elastomer film;
the sound absorption of film is based on resonance principle, and the sound absorption frequency band is relevant with self resonant frequency, and the resonant frequency of film is:
as shown in formula 5, the resonance frequency of the film is related to the tension, and the tension of the film after the electrification is shown as T1 in formula 3, and is obtained by taking formula 5:
from the formula 5, it is known that when voltage exists on the upper and lower surfaces of the dielectric elastomer film, the dielectric elastomer film expands under the action of the electric field force, the corresponding film prestress is reduced, the natural frequency of the dielectric elastomer film is reduced, and thus the sound absorption band shifts to a low frequency.
Examples
In order to make the honeycomb sandwich structure have better sound absorption effect, a layer of microperforated plate with fixed parameters and an upper panel 1 are paved on the upper surface of a honeycomb core 2, as shown in figure 1, a dielectric elastomer film sandwich layer 4 structure is added in the sandwich layer of an upper honeycomb core 201 and a lower honeycomb core 202, and a pre-stretched dielectric elastomer film sandwich layer 4 is fixed by utilizing a sub-gram force ring 3 and then is adhered with an aluminum honeycomb core 2. The flexible electrodes 5 are added on the middle film interlayers of the three adjacent honeycomb cores 2 to form an integral structure as shown in fig. 3, two wires 6 are led out subsequently, voltages with different magnitudes are applied to the wires 6, and the dielectric elastomer film interlayers 4 can be in different stress states, so that the sound absorption frequency band of the integral structure is adjusted.
A cylindrical, close-packed honeycomb structure is shown in fig. 3, and a top view is shown in fig. 4, and the honeycomb core 2 is stored to length as follows: the inner diameter is 28mm, the height is 66mm, and the upper panel and the lower panel are stored as follows: radius 49.5mm, thickness 0.5mm, wherein the upper panel perforation rate is 5%. Example a dielectric elastomer film interlayer 4 is arranged in seven complete honeycomb cores, the dielectric elastomer film interlayer 4 has a certain pre-stretching, flexible electrodes 5 are coated on three adjacent honeycomb cores 2, a sound absorption experiment is performed in an impedance tube, the sound absorption effect of a honeycomb-micro perforated plate structure before and after the film (referring to the dielectric elastomer film interlayer 4) is added is tested, different voltages are added to the structure subsequently, and the sound absorption effect of the structure is observed, as shown in fig. 6.
It can be seen from fig. 6 that the whole sound absorption effect is greatly improved after 600Hz after the dielectric elastomer film interlayer 4 is added, most of the whole sound absorption frequency band of the honeycomb structure is below 0.6 when the dielectric elastomer film interlayer 4 is not added, the whole sound absorption frequency band is improved to above 0.6 after the dielectric elastomer film interlayer 4 is added, and the sound absorption frequency band with the sound absorption coefficient as high as 0.8 is arranged between 700Hz and 1100 Hz. After 4kv voltage is applied to the whole structure, the whole sound absorption frequency band of the structure shifts to about 50Hz, and after 6kv voltage is applied to the structure, the sound absorption frequency band continues to shift to low frequency. And a peak value of sound absorption coefficient up to 0.964 appears around 835 Hz. As can be seen from the example, utilize the utility model discloses periodically arrange dielectric elastomer film intermediate layer 4 structure in honeycomb-microperforated panel structure can realize the adjustable of sound absorption frequency band, and then the control noise.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (5)
1. The utility model provides an adjustable dielectric elastomer intermediate layer honeycomb-micro-perforated plate structure, its characterized in that includes top panel (1) and lower panel (3) and presss from both sides honeycomb core (2) between top panel (1) and lower panel (3), top panel (1) is the micro-perforated panel, honeycomb core (2) are including last honeycomb core (201) and lower honeycomb core (202), be provided with dielectric elastomer film intermediate layer (4) between last honeycomb core (201) and lower honeycomb core (202), be provided with flexible electrode (5) on dielectric elastomer film intermediate layer (4) and draw forth by wire (6), exert different voltages through wire (6) to dielectric elastomer film intermediate layer (4) and make dielectric elastomer film intermediate layer (4) be in different stress state.
2. Tunable dielectric elastomer sandwich honeycomb-microperforated plate structure as defined in claim 1, characterized in that said honeycomb core (2) is a cylindrical close-packed honeycomb core structure.
3. The tunable dielectric elastomer sandwich honeycomb-microperforated plate structure of claim 1, characterized in that said dielectric elastomer film sandwich (4) is fixed between an upper honeycomb core (201) and a lower honeycomb core (202) by acrylic rings.
4. Tunable dielectric elastomer sandwich honeycomb-microperforated plate structure as defined in claim 1, characterized in that seven honeycomb cores (2) are integrated, and flexible electrodes (5) are provided only on the dielectric elastomer film sandwich (4) of three adjacent honeycomb cores (2) among them.
5. Tunable dielectric elastomer sandwich honeycomb-microperforated plate structure as defined in claim 4, characterized in that the centers of the three honeycomb cores (2) provided with flexible electrodes (5) are in the shape of equilateral triangles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120158607.8U CN213934895U (en) | 2021-01-20 | 2021-01-20 | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120158607.8U CN213934895U (en) | 2021-01-20 | 2021-01-20 | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213934895U true CN213934895U (en) | 2021-08-10 |
Family
ID=77158912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120158607.8U Expired - Fee Related CN213934895U (en) | 2021-01-20 | 2021-01-20 | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213934895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112699574A (en) * | 2021-01-20 | 2021-04-23 | 南昌航空大学 | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure and design method |
-
2021
- 2021-01-20 CN CN202120158607.8U patent/CN213934895U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112699574A (en) * | 2021-01-20 | 2021-04-23 | 南昌航空大学 | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure and design method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Acoustic metamaterials capable of both sound insulation and energy harvesting | |
| CN109493840B (en) | Adjustable double-layer film plate acoustic metamaterial structure based on repulsive force of permanent magnet | |
| CN107170437B (en) | Thin film sheet type acoustic metamaterial sound insulation device | |
| CN213934895U (en) | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure | |
| Lee et al. | A multilayer PVDF composite cantilever in the Helmholtz resonator for energy harvesting from sound pressure | |
| CN102111702B (en) | Piezoelectric flat panel loudspeaker with distributed ceramic wafers | |
| CN111696502B (en) | Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate | |
| US20090085441A1 (en) | Piezoelectric transducers and associated methods | |
| CN111739500A (en) | Underwater broadband sound absorption structure of perforated sandwich plate modified by damping layer | |
| CN103219918A (en) | Noise power generating device based on micro-perforated panel structure | |
| CN215268715U (en) | MEMS piezoelectric actuator and loudspeaker thereof | |
| CN112687251B (en) | Band gap adjustable auxetic phonon crystal, application and vibration damper | |
| CN110085207A (en) | Honeycomb-micropunch film composite structure design method | |
| US10356511B2 (en) | Ultrathin acoustic impedance converter | |
| CN111739502A (en) | Underwater sound absorption metamaterial with damping lining hexagonal honeycomb perforated plate | |
| CN111739501A (en) | Underwater sound absorption structure of damping lining level honeycomb perforated plate | |
| CN113012673B (en) | Sound absorber with adjustable sound absorption frequency band | |
| CN112699574A (en) | Adjustable dielectric elastomer sandwich honeycomb-micro perforated plate structure and design method | |
| WO2020261957A1 (en) | Polymer composite piezoelectric body and piezoelectric film | |
| CN111505127A (en) | Experimental device for surrounding type local resonance light dot matrix sandwich plate structure | |
| CN212342263U (en) | Gradient film type periodic composite structure | |
| CN113192481B (en) | Coiled Helmholtz resonator for low-frequency noise control | |
| CN205610901U (en) | Novel ultra -thin sound wave impedance transformer | |
| CN114197668B (en) | Periodic film building sound absorption and insulation super structure | |
| CN113443037B (en) | Software bionic robot and software crawler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210810 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |