CN217719973U - Honeycomb wave-absorbing superstructure based on additive manufacturing - Google Patents
Honeycomb wave-absorbing superstructure based on additive manufacturing Download PDFInfo
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- CN217719973U CN217719973U CN202222107071.4U CN202222107071U CN217719973U CN 217719973 U CN217719973 U CN 217719973U CN 202222107071 U CN202222107071 U CN 202222107071U CN 217719973 U CN217719973 U CN 217719973U
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- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a honeycomb wave-absorbing superstructure based on additive manufacturing, which comprises a supporting flat plate, a polyhedral superstructure and a polygonal reflecting wall; the support flat plate is of a flat structure and is used for bearing a plurality of periodically arranged polyhedral superstructures and polygonal reflecting walls; the polyhedron superstructure is in a pyramid structure or a frustum pyramid structure; the polygonal reflection walls are distributed around the polyhedral superstructure and enclose the polyhedral superstructure. The polyhedron superstructure and the polygonal reflecting wall in the utility model are periodically arranged on the supporting flat plate, when the electromagnetic wave vertically enters, the absorption effect is insensitive to the polarization mode of the electromagnetic wave, and the absorption effect is stable; the utility model discloses in can realize the electromagnetic wave absorption frequency band of broad under less thickness, the honeycomb is inhaled the ripples superstructure and is by intensity better, and wave absorption performance is stable, has good bearing capacity, good mechanical properties in addition when can obtain excellent electromagnetic wave absorption performance.
Description
Technical Field
The utility model relates to an absorbing material technical field, more specifically say, the utility model relates to a honeycomb is inhaled ripples superstructure based on vibration material disk.
Background
With the application and development of communication technologies such as Wifi and 5G and the uncontrollable increase of high-performance electronic products such as mobile phones, notebook computers and wireless devices, the electromagnetic radiation energy in the surrounding environment also increases rapidly, and the electromagnetic radiation pollution is increasingly serious. Electromagnetic radiation pollution not only can affect the normal operation of electronic equipment, but also can cause adverse effects on human bodies and natural environments. In modern national defense and military wars, the improvement of stealth capability and defense-breaking capability of strategic weapons is always the key point of research of all military and strong countries.
Although the production process of the traditional structural wave-absorbing composite materials such as a layered structure film, conical foam and the like is mature, the wave-absorbing composite materials have poor mechanical properties and sharply reduced wave-absorbing performance under small thickness. The honeycomb wave-absorbing structure taking the aramid fiber paper as the matrix not only widens the absorption frequency band, but also reduces the thickness of the wave-absorbing composite material to a certain extent by soaking the wave-absorbing agent. However, due to the limitation of preparation technology, the wave-absorbing composite material has the problems of uneven impregnation and easy falling-off of the wave-absorbing agent, so that the wave-absorbing performance is unstable, and the bearing capacity of the wave-absorbing composite material needs to be improved. In addition, the wave-absorbing honeycomb structure is improved by filling wave-absorbing foam materials in the honeycomb structure or adding skins on the upper surface and the lower surface of the honeycomb structure. These methods enhance the electromagnetic wave absorption performance to some extent, but also increase the density of the structure.
The maturity and the wide application of 3D printing technique provide very big degree of freedom in aspects such as material selection and structural design for the design and the preparation of electromagnetism wave-absorbing structure. However, the existing wave-absorbing honeycomb composite material prepared by using the 3D printing technology is only used for preparing a carrier of the wave-absorbing material, or the wave-absorbing honeycomb composite material is single in structural design, does not fully exert the manufacturing advantages of the 3D printing technology, and realizes the design and direct manufacturing of a wave-absorbing superstructure with wide absorption frequency band and large oblique incidence absorption angle.
In order to solve the problems of narrow effective absorption band and poor bearing capacity of the existing wave-absorbing structure, a technical person in the field needs to provide a honeycomb wave-absorbing superstructure which is wide in absorption band, stable in absorption performance and good in mechanical performance and is based on additive manufacturing urgently.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned defect of prior art, the utility model provides a wave-absorbing superstructure is inhaled to honeycomb based on vibration material disk, the absorption band is wide, and wave-absorbing performance is stable, and mechanical properties is good.
In order to achieve the above object, the utility model provides a wave-absorbing superstructure of honeycomb based on additive manufacturing, including supporting flat board, polyhedron superstructure and polygon reflection wall; the supporting flat plate is of a flat plate structure and is used for bearing a plurality of periodically arranged polyhedral superstructures and polygonal reflecting walls; the polyhedron superstructure is in a pyramid structure or a frustum structure; the polygonal reflecting walls are distributed around the polyhedral superstructure and enclose the polyhedral superstructure.
Preferably, the polyhedral superstructure is a triangular pyramid, a rectangular pyramid, a hexagonal pyramid, a triangular frustum, a rectangular frustum or a hexagonal frustum structure.
Preferably, the side length of the bottom surface of the polyhedron superstructure is L1，1mm≤L1Less than or equal to 30mm; the height H of the polyhedral superstructure1，5mm≤H1≤30mm。
Preferably, the polygonal reflecting wall has a cross-sectional shape of a triangle, a quadrangle or a hexagon.
Preferably, the inner side length L of the polygonal reflective wall2，5mm≤L2Less than or equal to 50mm; height H of the polygonal reflective wall2，5mm≤H2Less than or equal to 30mm; the thickness B of the polygonal reflecting wall is more than or equal to 1mm and less than or equal to 5mm.
Preferably, the height of the support flat plate is H, and H is more than or equal to 0.1mm and less than or equal to 3mm.
Preferably, the honeycomb wave-absorbing superstructure is prepared by adopting a 3D printing process, and the printing filling rate is 20-100%.
The utility model discloses a technological effect and advantage:
1. the polyhedron superstructure and the polygonal reflecting wall in the utility model are periodically arranged on the supporting flat plate, when the electromagnetic wave vertically enters, the absorption effect is insensitive to the polarization mode of the electromagnetic wave, and the absorption effect is stable;
2. the utility model discloses the inside more electromagnetic waves of different frequencies are allowed to enter into the structure to the bigger radius size in the polygon reflection wall in the utility model, and the incident wave takes place many times reflection again between the polyhedron superstructure in the inside and the polygon reflection wall to produce more resonance frequency points;
3. the utility model discloses guaranteeing under the prerequisite that effective electromagnetic wave absorbs and covers 8-18GHz frequency band, the honeycomb is inhaled ripples superstructure's thickness less, and structure density is 0.37g/cm3The light weight is achieved;
4. the honeycomb wave-absorbing superstructure prepared by the 3D printing process has stable wave-absorbing performance, good mechanical performance and good bearing capacity, and a single superstructure unit cannot be damaged under the pressure exceeding 2000N.
Drawings
Fig. 1 is a three-dimensional structure diagram of a honeycomb wave-absorbing superstructure in embodiment 4 of the present invention;
fig. 2 is a top view of a honeycomb wave-absorbing superstructure in embodiment 4 of the present invention;
fig. 3 is a side view of a honeycomb wave-absorbing superstructure in embodiment 4 of the present invention;
fig. 4 is a three-dimensional structure diagram of a honeycomb wave-absorbing superstructure in embodiments 1-3 of the present invention;
fig. 5 is a top view of the honeycomb wave-absorbing superstructure in embodiments 1-3 of the present invention;
fig. 6 is a side view of the honeycomb wave-absorbing superstructure in embodiments 1-3 of the present invention;
FIG. 7 is a graph showing the electromagnetic wave absorption performance at the time of the perpendicular incidence of the electromagnetic wave in example 1;
FIG. 8 is a graph showing the absorption performance of the electromagnetic wave at the time of the normal incidence of the electromagnetic wave in example 2;
FIG. 9 is a graph showing the electromagnetic wave absorption performance at the time of normal incidence of electromagnetic waves in example 3;
FIG. 10 is a graph showing the absorption performance of the electromagnetic wave at the time of the normal incidence of the electromagnetic wave in example 4;
fig. 11 is a compressive strength test displacement load curve of the honeycomb wave-absorbing superstructure prepared by 3D printing.
The reference signs are:
100. supporting the flat plate; 200. a polyhedral superstructure; 300. polygonal reflective walls.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a honeycomb wave-absorbing superstructure based on additive manufacturing, which comprises a supporting flat plate 100, a polyhedron superstructure 200 and a polygonal reflecting wall 300; the support flat plate 100 is of a flat plate structure and is used for bearing a plurality of periodically arranged polyhedral superstructures 200 and polygonal reflecting walls 300; the polyhedron superstructure 200 is in a pyramid structure or a frustum of pyramid structure; polygonal reflective walls 300 are distributed around the polyhedral superstructure and enclose the polyhedral superstructure 200.
The utility model provides a polyhedron superstructure 200 and polygon reflection wall 300 are periodic arrangement on supporting plate 100, and when the electromagnetic wave vertical incidence, its absorption effect is insensitive to the electromagnetic wave polarization mode, and the absorption effect is stable.
Wherein the polyhedral superstructure 200 is a triangular pyramid, a rectangular pyramid, a hexagonal pyramid, a triangular frustum, a rectangular frustum or a hexagonal frustum structure; the side length of the bottom surface of the polyhedron superstructure 200 is L1，1mm≤L1Less than or equal to 30mm; polyhedral superstructure 200 height H1，5mm≤H1≤30mm。
Meanwhile, the cross-sectional shape of the polygonal reflecting wall 300 is a triangle, a quadrangle or a hexagon, and the inner side length L of the polygonal reflecting wall 3002，5mm≤L2Less than or equal to 50mm; height H of polygonal reflecting wall 3002，5mm≤H2Less than or equal to 30mm; the thickness B of the polygonal reflecting wall 300 is more than or equal to 1mm and less than or equal to 5mm.
In addition, the height of the support flat plate 100 is H, and H is more than or equal to 0.1mm and less than or equal to 3mm.
The utility model provides a wave superstructure is inhaled to honeycomb adopts 3D printing technology preparation to form, prints the filling rate and is 20% ~ 100%. The honeycomb wave-absorbing superstructure prepared by 3D printing has good bearing capacity, and the honeycomb wave-absorbing superstructure unit prepared by 3D printing cannot be damaged under the pressure exceeding 2000N.
The electromagnetic wave absorbent in the 3D printing wire material with electromagnetic wave absorption capacity comprises carbon nano tubes, carbon fibers, carbon black, ferrite or carbonyl iron and the like, and the matrix comprises polylactic acid, polyether ether ketone, acrylonitrile-butadiene-styrene or polyurethane and the like.
The utility model discloses well honeycomb is inhaled ripples superstructure's design principle does: the traditional honeycomb wave-absorbing structure is characterized in that wave-absorbing slurry is soaked on the inner surface and the outer surface of a prepared honeycomb hole matrix, the interior of the honeycomb hole matrix is filled with unfilled hexagonal or other polygonal holes, the maximum channel radius of the holes is small, and the half of the holes does not exceed 1/4 of the wavelength of a working frequency band. The surface wave-absorbing coating with good conductivity is combined with dense holes, so that electromagnetic waves are not favorably fed into the structure, and the reflection effect of incident electromagnetic waves in honeycomb holes is limited. The utility model discloses inside will inhale the ripples superstructure and introduce honeycomb, increased the structure volume that can absorb the electromagnetic wave on the one hand, on the other hand has regulated and controlled the propagation direction of electromagnetic wave in honeycomb, has increased electromagnetic wave propagation path and multiple reflection. The honeycomb wave-absorbing superstructure has a larger honeycomb hole radius, the size of the honeycomb wave-absorbing superstructure is equivalent to the wavelength of incident waves, electromagnetic waves entering the structure are increased, the resonant absorption of the structure to the energy of the incident waves is improved by adding the cone structure, and the absorption frequency band is widened.
Example 1:
as shown in fig. 4, in this embodiment, the polyhedral superstructure 200 is a hexagonal pyramid structure, and the polygonal reflective wall 300 is a hexagonal honeycomb as a periodic unit of the honeycomb wave-absorbing superstructure, and the parameters are as follows: h =1.1mm, L1＝12mm，H1＝15mm，L2＝16mm，H2=15mm, and =2mm. Modeling is carried out on the honeycomb wave-absorbing superstructure in electromagnetic simulation software, the structural material is defined as a composite material of a carbon nano tube electromagnetic wave absorbent and a polylactic acid matrix, the real part of the complex dielectric constant is more than or equal to 10 and less than or equal to epsilon '. Ltoreq.25, the imaginary part is more than or equal to 5 and less than or equal to epsilon'. Ltoreq.15, the loss tangent is more than or equal to 0.2 and less than or equal to tan delta.ltoreq.1, and the reflection coefficient is calculated.
In the case of stable vertical incidence of planar electromagnetic waves, the reflection coefficient of the honeycomb wave-absorbing superstructure in this embodiment is lower than-10 dB in the full frequency band of 8-18GHz, lower than-15 dB in the frequency bands of 8-9.3 GHz and 12-18 GHz, and lower than-20 dB in the frequency bands of 8-8.8 GHz and 13.4-17 GHz, as shown in fig. 7.
When the polyhedral superstructure 200 is a hexagonal pyramid structure and the polygonal reflecting wall 300 is a hexagonal honeycomb, absorption of more than 90% of incident wave energy can be realized within a range of 8-18GHz band, and the frequency band with the absorption effect of more than 99% reaches 4.5GHz.
Example 2:
as shown in fig. 4, in this embodiment, the polyhedral superstructure 200 is a hexagonal pyramid structure, and the polygonal reflective wall 300 is a hexagonal honeycomb as a periodic unit of the honeycomb wave-absorbing superstructure, and the parameters are as follows: h =1.1mm, l1＝14mm，H1＝15mm，L2＝16mm，H2=15mm, and =2mm. Modeling the honeycomb wave-absorbing superstructure in electromagnetic simulation software, wherein the structural material is defined as a composite material of a carbon nano tube electromagnetic wave absorbent and a polylactic acid matrix, the real part of the complex dielectric constant is more than or equal to 10 and less than or equal to epsilon '. Ltoreq.25, the imaginary part is more than or equal to 5 and less than or equal to epsilon'. Ltoreq.15, the loss tangent is more than or equal to 0.2 and less than or equal to tan delta.ltoreq.1, and calculating the reflection coefficient.
As shown in fig. 8, when the stable planar electromagnetic wave is vertically incident, the reflection coefficient of the cellular wave-absorbing superstructure in this embodiment is lower than-10 dB in the full frequency band of 8-18GHz, and the frequency bands lower than-15 dB are 8-9.6 GHz and 10.8-18 GHz, which account for 88% of the X, ku waveband.
Example 3:
as shown in fig. 4, in the present embodiment, the polyhedral superstructure 200 is a hexagonal pyramid structure, the polygonal reflective wall 300 is a hexagonal honeycomb as a periodic unit of the honeycomb wave-absorbing superstructure, and the parameters are as follows: h =1.1mm, L1＝12mm，H1＝15mm，L2＝16mm，H2=15mm and b =3.5mm. Modeling the honeycomb wave-absorbing superstructure in electromagnetic simulation software, wherein the structural material is defined as a composite material of a carbon nano tube electromagnetic wave absorbent and a polylactic acid matrix, the real part of the complex dielectric constant is more than or equal to 10 and less than or equal to epsilon '. Ltoreq.25, the imaginary part is more than or equal to 5 and less than or equal to epsilon'. Ltoreq.15, the loss tangent is more than or equal to 0.2 and less than or equal to tan delta.ltoreq.1, and calculating the reflection coefficient.
In the embodiment, when stable plane electromagnetic waves are vertically incident, the reflection coefficient of the honeycomb wave-absorbing superstructure is lower than-10 dB in a full frequency band of 8-18GHz, the frequency band lower than-15 dB is 8-17.9 GHz, and 99% of a X, ku wave band is covered, as shown in FIG. 9.
Example 4:
as shown in fig. 1, in the present embodiment, the polyhedral superstructure 200 is a rectangular pyramid structure, the polygonal reflective wall 300 is a quadrilateral honeycomb as a periodic unit of the honeycomb wave-absorbing superstructure, and the parameters are as follows: h =1mm, l1＝25mm，H1＝15mm，L2＝19mm，H2=15mm, b =0.75mm. Modeling is carried out on the honeycomb wave-absorbing superstructure in electromagnetic simulation software, the structural material is defined as a composite material of a carbon nano tube electromagnetic wave absorbent and a polylactic acid matrix, the real part of the complex dielectric constant is more than or equal to 10 and less than or equal to epsilon '. Ltoreq.25, the imaginary part is more than or equal to 5 and less than or equal to epsilon'. Ltoreq.15, the loss tangent is more than or equal to 0.2 and less than or equal to tan delta.ltoreq.1, and the reflection coefficient is calculated.
In the case of the stable plane electromagnetic wave vertical incidence, the reflection coefficient of the honeycomb wave-absorbing superstructure in this embodiment is lower than-10 dB in the full frequency band of 8-18GHz, and the frequency band lower than-20 dB is 5.9GHz in total, as shown in fig. 10.
To sum up, can see, the honeycomb inhale the ripples superstructure can realize the electromagnetic wave absorption frequency band of broad under less thickness, the honeycomb inhale the ripples superstructure by intensity better, the wave absorption performance is stable, has good bearing capacity, good mechanical properties in addition when can obtain excellent electromagnetic wave absorption performance.
Finally, the above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A honeycomb wave-absorbing superstructure based on additive manufacturing is characterized by comprising a supporting flat plate, a polyhedral superstructure and a polygonal reflecting wall; the supporting flat plate is of a flat plate structure and is used for bearing a plurality of periodically arranged polyhedral superstructures and polygonal reflecting walls; the polyhedron superstructure is in a pyramid structure or a frustum pyramid structure; the polygonal reflection walls are distributed around the polyhedral superstructure and enclose the polyhedral superstructure.
2. The additive manufacturing-based honeycomb wave-absorbing superstructure according to claim 1, characterized in that said polyhedral superstructure is a triangular pyramid, a rectangular pyramid, a hexagonal pyramid, a triangular frustum, a rectangular frustum or a hexagonal frustum structure.
3. The additive manufacturing-based honeycomb wave-absorbing superstructure of claim 2, wherein the polyhedral superstructure has a bottom surface side length of L1，1mm≤L1Less than or equal to 30mm; the height H of the polyhedron superstructure1，5mm≤H1≤30mm。
4. The additive manufacturing-based cellular wave absorbing superstructure of claim 1, wherein the polygonal reflective walls have a cross-sectional shape of a trilateral, quadrilateral or hexagonal.
5. The additive manufacturing-based cellular wave absorbing superstructure of claim 4, wherein internal side lengths of said polygonal reflective wallsL2，5mm≤L2Less than or equal to 50mm; height H of the polygonal reflective wall2，5mm≤H2Less than or equal to 30mm; the thickness B of the polygonal reflecting wall is more than or equal to 1mm and less than or equal to 5mm.
6. The additive manufacturing-based honeycomb wave-absorbing superstructure according to claim 1, wherein the height of the supporting flat plate is H, H is 0.1mm ≤ H ≤ 3mm.
7. The additive manufacturing-based honeycomb wave-absorbing superstructure according to claim 1, characterized in that the honeycomb wave-absorbing superstructure is prepared by a 3D printing process, and the printing filling rate is 20-100%.
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