CN114104331B - Wave absorber for reducing low-frequency dispersion - Google Patents
Wave absorber for reducing low-frequency dispersion Download PDFInfo
- Publication number
- CN114104331B CN114104331B CN202111341943.7A CN202111341943A CN114104331B CN 114104331 B CN114104331 B CN 114104331B CN 202111341943 A CN202111341943 A CN 202111341943A CN 114104331 B CN114104331 B CN 114104331B
- Authority
- CN
- China
- Prior art keywords
- wave absorber
- wave
- tested
- edge
- absorber
- 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.)
- Active
Links
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 82
- 239000006185 dispersion Substances 0.000 title claims abstract description 7
- 239000006260 foam Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 15
- 230000001154 acute effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 5
- 230000010287 polarization Effects 0.000 description 4
- 229920001247 Reticulated foam Polymers 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Transportation (AREA)
- Aviation & Aerospace Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention provides a wave absorber for reducing low-frequency dispersion, which is applied to the field of electromagnetic scattering measurement, wherein the wave absorber is attached to the edge of the bottom surface of a part to be measured, the part to be measured is connected with a carrier, the carrier is used for supporting the part to be measured, and the edge of the bottom surface is the edge of the part to be measured, which is contacted with the carrier; the wave absorber is made of wave absorbing foam. The wave absorber provided by the invention has the excellent effect of reducing the low-frequency scattering of the edge of the bottom surface of the part to be tested.
Description
Technical Field
The invention relates to the field of electromagnetic scattering measurement, in particular to a wave absorber for reducing low-frequency scattering.
Background
After the overall stealth appearance design of the aircraft is completed, stealth performance of each component of the aircraft needs to be tested.
However, once the component is isolated from the body, the edges of the component and the embedded structure are exposed, and if the component is tested without any treatment, scattering of the edges and the embedded structure affects the testing accuracy of the component. For this reason, the patent CN106428625a designs a low scattering carrier, and the carrier and the component are designed in an integrated structure, and the carrier and the component are smoothly and tightly connected, so that not only is the scattering of the edge of the component eliminated, but also the inner cavity structure of the component is shielded, and the state of the component in the actual installation is better simulated, but in the low frequency band, the carrier and the component are affected by stronger low-frequency diffraction, and the stronger travelling wave scattering effect exists at the tail end of the device.
Therefore, a method for reducing the traveling wave scattering at the tail end of the device is urgently needed.
Disclosure of Invention
The embodiment of the invention provides a wave absorber for reducing low-frequency dispersion, which can reduce the low-frequency dispersion of the edge of the bottom surface of a part to be tested.
In a first aspect, the present invention provides a wave absorber for reducing low frequency dispersion, the wave absorber being attached to a bottom edge of a component to be tested, the component to be tested being connected to a carrier, the carrier being for supporting the component to be tested, the bottom edge being an edge of the component to be tested in contact with the carrier;
the wave absorber is made of wave absorbing foam.
Preferably, the wave absorber comprises a first wave absorber and a second wave absorber, and the first wave absorber and the second wave absorber are enclosed to form the wave absorber.
Preferably, the first wave absorber and the second wave absorber are both provided with arc grooves, and the arc grooves are matched with the bottom edge of the part to be tested.
Preferably, the projection of the outer surface of the absorber onto the horizontal plane has two ends at an acute angle.
Preferably, one of the ends has an included angle of 50-60 ° and the other end has an included angle of 75-80 °.
Preferably, the projection of the wave absorber onto the horizontal plane has an outer contour and an inner contour, and the distance between the outer contour and the inner contour is 15-20cm.
Preferably, the wave-absorbing foam is a reticulated foam of the JCXB-QFL series.
Preferably, the first wave absorber and the second wave absorber are fixed by using a paper adhesive tape at the surrounding and splicing position.
In a second aspect, the present invention provides a part to be tested for performing RCS testing, comprising a wave absorber according to any of the first aspects above, the wave absorber being attached to a bottom edge of the part to be tested.
Compared with the prior art, the invention has at least the following beneficial effects:
in the invention, in order to test the stealth performance of the aircraft component, the component to be tested is required to be placed on the carrier with low scattering performance, and the carrier wraps the bottom edge of the component to be tested and shields the embedded structure, so that the accuracy of a test result is ensured, and the interference of scattering generated by the bottom edge and the embedded structure on the test result of the component is avoided. However, because the low-frequency diffraction is stronger, the bottom edge of the part to be measured has stronger travelling wave scattering effect, the surface travelling wave of the part to be measured changes drastically along with the pitching adjustment of the part to be measured, and the appearance of the part to be measured does not have excellent capability of inhibiting the travelling wave scattering, therefore, the inventor attaches a wave absorber to the bottom edge of the part to be measured to solve the problems, and the wave absorber is wave absorbing foam with excellent wave absorbing capability in the low-frequency band, and reduces the low-frequency scattering of the part to be measured by absorbing the electromagnetic wave in the low-frequency band at the bottom edge, so that the part to be measured accurately simulates the state of an actual installation, and the measured data accurately represents the stealth effect of the part during the installation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a bottom view of a part under test for RCS testing provided by an embodiment of the invention;
FIG. 2 is a graph of the material low frequency reflectance of a reticulated foam of the JCXB-QFL series provided by an embodiment of the present invention;
FIG. 3 is a projection view of the outer surface of the absorber projected to a horizontal plane according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a wave absorber according to an embodiment of the present invention.
In the figure:
1. a wave absorber; 2. a part to be tested;
31. an outer contour; 32. an inner profile;
4. an arc-shaped groove;
A、75-80°；B、50-60°。
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
The invention provides a wave absorber 1 for reducing low-frequency scattering, wherein the wave absorber 1 is attached to the bottom edge of a part to be tested 2, the part to be tested 2 is connected with a carrier, the carrier is used for supporting the part to be tested 2, and the bottom edge is the edge of the part to be tested 2 in contact with the carrier;
the wave absorber 1 is made of wave absorbing foam.
In the invention, in order to test the stealth performance of the aircraft component, the component 2 to be tested is required to be placed on the carrier with low scattering performance, and the carrier wraps the bottom edge of the component 2 to be tested and shields the embedded structure, so that the accuracy of a test result is ensured, and the interference of scattering generated by the bottom edge and the embedded structure on the test result of the component is avoided. However, because there is stronger low-frequency diffraction in the low frequency band, there is stronger travelling wave scattering effect in the bottom edge of the part to be tested 2, the surface travelling wave of the part to be tested 2 changes drastically along with the pitching adjustment, but the shape of the part to be tested 2 does not have excellent capability of suppressing travelling wave scattering, therefore, the inventor attaches the wave absorber 1 to the bottom edge of the part to be tested 2 to solve the above problem, the wave absorber 1 is a wave absorbing foam with excellent wave absorbing capability in the low frequency band, the wave absorber 1 absorbs the low-frequency electromagnetic wave of the bottom edge to reduce the low-frequency scattering of the part to be tested 2, so that the part to be tested 2 accurately simulates the state of an actual installation, and the measured data accurately represents the stealth effect of the part during the installation.
It should be noted that, the wave absorber 1 and the component 2 to be tested are in conformal structures, and the wave absorber 1 and the component 2 to be tested are tightly combined in a covering shape, so that low-frequency band traveling wave scattering existing at the edge of the bottom surface of the component 2 to be tested is more easily absorbed by the wave absorber 1, and is further lost.
According to some preferred embodiments, the wave absorber 1 comprises a first wave absorber and a second wave absorber, which enclose to form the wave absorber 1.
In the present invention, the wave absorber 1 is provided as two parts of the first wave absorber and the second wave absorber, so that the component 2 to be measured can be surrounded by the two parts.
According to some preferred embodiments, the first wave-absorbing body and the second wave-absorbing body are each provided with an arc-shaped groove 4, and the arc-shaped groove 4 is adapted to the bottom edge of the part 2 to be tested.
In the invention, the shape of the arc-shaped groove 4 of the wave absorber 1 is designed according to the edge of the bottom surface, and the shape of the arc-shaped groove 4 is consistent with the shape of the surface of the edge of the bottom surface, so that the wave absorber 1 and the edge of the bottom surface can be tightly and seamlessly attached. In addition, the wave absorber 1 can be fixed on the edge of the bottom surface through the arc-shaped groove 4.
According to some preferred embodiments, the projection of the outer surface of the wave absorber 1 onto the horizontal plane has two ends at an acute angle.
In the present invention, the two acute angle ends can reduce vertical polarization scattering and horizontal polarization scattering of electromagnetic waves.
According to some preferred embodiments, one of the ends has an included angle of 50-60 ° and the other end has an included angle of 75-80 °.
In the present invention, the angles between the two ends are 50-60 ° and 75-80 ° respectively, so that the vertical polarization scattering and the horizontal polarization scattering of the component 2 to be measured are minimized.
According to some preferred embodiments, the projection of the wave absorber 1 onto the horizontal plane has an outer contour 31 and an inner contour 32, the distance between the outer contour 31 and the inner contour 32 being 15-20cm.
In the invention, the distance between the outer contour 31 and the inner contour 32 is within 15-20cm, which not only has excellent wave absorbing effect, but also saves materials and lightens the mass of the wave absorber 1.
According to some preferred embodiments, the wave-absorbing foam is a reticulated foam of the JCXB-QFL series.
The mesh foam of the JCXB-QFL series is a low-frequency wave-absorbing foam material, and the specific wave-absorbing properties of the material are shown in table 1 and fig. 2.
According to some preferred embodiments, the first wave-absorbing body and the second wave-absorbing body are fixed by using a paper tape at the surrounding and splicing position.
In the invention, the paper adhesive tape is used for fixing the surrounding and splicing parts of the first wave-absorbing body and the second wave-absorbing body, so that the wave-absorbing body 1 positioned at the edge of the bottom surface is more firmly attached to the part to be tested 2 during testing.
The invention also provides a part to be tested for RCS test, which comprises the wave absorber, wherein the wave absorber is attached to the edge of the bottom surface of the part to be tested.
Examples:
before RCS test is carried out on the part to be tested, preparing a wave absorber according to the shape of the bottom surface edge of the part to be tested, enabling the inner surface of the wave absorber to be tightly attached to the bottom surface edge of the part to be tested (the contact part of the wave absorber and the part to be tested is an inner surface, and the contact part of the wave absorber and the part to be tested is not an outer surface), wherein the wave absorber comprises a first wave absorber and a second wave absorber which can splice the part to be tested around, the included angles of two end parts of horizontal projection of the outer surface of the wave absorber are 55 degrees and 79 degrees respectively, the distance between the outer contour and the inner contour of the horizontal projection is 18cm, and the wave absorbing material is a JCXB-QFL series of reticular foam;
the first wave absorber and the second wave absorber are spliced at two sides of the edge of the bottom surface of the part to be detected, and are fixed at the spliced position by using a paper adhesive tape;
and testing the to-be-tested component with the wave absorber attached to the edge of the bottom surface, wherein the RCS of the P wave band is reduced to 8-10dB, and the RCS of the L wave band is reduced to 10-15dB.
According to the embodiment, the wave absorber is attached to the bottom edge of the part to be tested, so that electromagnetic waves in a low frequency band can be effectively absorbed.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A wave absorber (1) for reducing low-frequency dispersion, wherein the wave absorber (1) is attached to the bottom surface edge of a part to be tested (2), the part to be tested (2) is connected with a carrier, the carrier is used for supporting the part to be tested (2), and the bottom surface edge is the edge of the part to be tested (2) contacted with the carrier;
the wave absorber (1) is made of wave absorbing foam;
the wave absorber (1) comprises a first wave absorber and a second wave absorber, and the first wave absorber and the second wave absorber are enclosed to form the wave absorber (1);
the first wave absorber and the second wave absorber are respectively provided with an arc-shaped groove (4), and the arc-shaped grooves (4) are matched with the bottom edge of the part (2) to be tested;
the projection of the outer surface of the wave absorber (1) onto the horizontal plane is provided with two end parts with acute angles;
the included angle (B) of one end part is 50-60 degrees, and the included angle (A) of the other end part is 75-80 degrees;
the projection of the wave absorber (1) onto the horizontal plane is provided with an outer contour (31) and an inner contour (32), and the distance between the outer contour (31) and the inner contour (32) is 15 cm-20 cm.
2. The wave absorber (1) according to claim 1, characterized in that the wave absorbing foam is a mesh foam of the JCXB-QFL series.
3. The wave-absorbing body (1) according to claim 1, characterized in that the splice of the first wave-absorbing body and the second wave-absorbing body is fixed by using a paper tape.
4. A component (2) to be tested for RCS testing, comprising a wave absorber (1) according to any of claims 1-3, said wave absorber (1) being attached to a bottom edge of said component (2) to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341943.7A CN114104331B (en) | 2021-11-12 | 2021-11-12 | Wave absorber for reducing low-frequency dispersion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111341943.7A CN114104331B (en) | 2021-11-12 | 2021-11-12 | Wave absorber for reducing low-frequency dispersion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114104331A CN114104331A (en) | 2022-03-01 |
| CN114104331B true CN114104331B (en) | 2023-06-30 |
Family
ID=80379673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111341943.7A Active CN114104331B (en) | 2021-11-12 | 2021-11-12 | Wave absorber for reducing low-frequency dispersion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114104331B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117471400B (en) * | 2023-11-01 | 2025-02-14 | 沈阳飞机工业（集团）有限公司 | A low-scattering joint carrier that takes into account RCS testing of multiple finished parts |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203512020U (en) * | 2013-10-18 | 2014-04-02 | 深圳光启创新技术有限公司 | Wing structure |
| CN106428625A (en) * | 2016-09-14 | 2017-02-22 | 北京环境特性研究所 | Low-scattering carrier used for RCS test |
| CN111005807A (en) * | 2019-11-22 | 2020-04-14 | 北京机电工程研究所 | Cavity structure applying wave-absorbing material |
| CN112117550A (en) * | 2019-06-21 | 2020-12-22 | 深圳市环波科技有限责任公司 | Wave-absorbing unit structure |
| CN112591139A (en) * | 2020-12-25 | 2021-04-02 | 中国航空工业集团公司沈阳飞机设计研究所 | Low-scattering supporting system of mounting aircraft |
| CN112606993A (en) * | 2020-12-24 | 2021-04-06 | 中国航空工业集团公司沈阳飞机设计研究所 | Flap edge scattering suppression device |
| CN113075634A (en) * | 2021-03-29 | 2021-07-06 | 北京环境特性研究所 | RCS (Radar Cross section) evaluation carrier for vertical polarized waves |
| CN113567915A (en) * | 2021-09-28 | 2021-10-29 | 中国人民解放军火箭军工程大学 | Active and passive composite radio frequency detector hanging test device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002076675A (en) * | 2000-08-31 | 2002-03-15 | Canon Inc | Wave absorber and its manufacturing method |
| DE102008062701A1 (en) * | 2008-12-17 | 2010-07-01 | Airbus Deutschland Gmbh | Aircraft cabin panel with core pockets for sound absorption |
-
2021
- 2021-11-12 CN CN202111341943.7A patent/CN114104331B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203512020U (en) * | 2013-10-18 | 2014-04-02 | 深圳光启创新技术有限公司 | Wing structure |
| CN106428625A (en) * | 2016-09-14 | 2017-02-22 | 北京环境特性研究所 | Low-scattering carrier used for RCS test |
| CN112117550A (en) * | 2019-06-21 | 2020-12-22 | 深圳市环波科技有限责任公司 | Wave-absorbing unit structure |
| CN111005807A (en) * | 2019-11-22 | 2020-04-14 | 北京机电工程研究所 | Cavity structure applying wave-absorbing material |
| CN112606993A (en) * | 2020-12-24 | 2021-04-06 | 中国航空工业集团公司沈阳飞机设计研究所 | Flap edge scattering suppression device |
| CN112591139A (en) * | 2020-12-25 | 2021-04-02 | 中国航空工业集团公司沈阳飞机设计研究所 | Low-scattering supporting system of mounting aircraft |
| CN113075634A (en) * | 2021-03-29 | 2021-07-06 | 北京环境特性研究所 | RCS (Radar Cross section) evaluation carrier for vertical polarized waves |
| CN113567915A (en) * | 2021-09-28 | 2021-10-29 | 中国人民解放军火箭军工程大学 | Active and passive composite radio frequency detector hanging test device |
Non-Patent Citations (2)
| Title |
|---|
| 低RCS载体上宽带天线及阵列的隐身设计;罗韬;中国优秀硕士学位论文全文数据库 (信息科技辑);I136-44 * |
| 低散射目标支撑金属支架的外形参数优化;安大卫;李志平;陈五一;;电讯技术(第03期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114104331A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114104331B (en) | Wave absorber for reducing low-frequency dispersion | |
| EP3282267B1 (en) | Wireless terminal testing system | |
| US20120146861A1 (en) | Antenna characterization in a waveguide | |
| JP7309847B2 (en) | Near-field antenna for remote radio control of antenna arrays | |
| EP3182144B1 (en) | Wireless terminal testing system and method for controlling same | |
| CN106428625A (en) | Low-scattering carrier used for RCS test | |
| JPH02153598A (en) | Electromagnetically shielded room provided with reflective plate | |
| CN113687323B (en) | Low-scattering shell for binary vector engine and application thereof | |
| CN105929254A (en) | Microwave darkroom | |
| CN114162347B (en) | P-band low-scattering carrier and application method thereof | |
| Li et al. | Polarization-insensitive and thin stereometamaterial with broadband angular absorption for the oblique incidence | |
| CN112003025A (en) | Reflecting surface and compact range measuring system with same | |
| CN107733537A (en) | Darkroom-like coupling test method and test equipment for radio frequency performance test | |
| US2656535A (en) | Nonreflecting background for testing microwave equipment | |
| WO2011109961A1 (en) | Mobile terminal for balancing specific absorption rate and total radiated power and method thereof | |
| CN110750908A (en) | Method for simulating coupling characteristics of airplane front door under strong electromagnetic pulse radiation | |
| US20190334248A1 (en) | Coating for the concealment of objects from the electromagnetic radiation of antennas | |
| CN103913470B (en) | The cover body defect inspection method of the conformal bearer antenna being distributed based on far zone field | |
| US20150355109A1 (en) | Edge treatment system and method for evaluating a material | |
| CN207399753U (en) | A kind of absorbing material structure with metal shielding board | |
| TWI697682B (en) | Comprehensive antenna measurement system for far-field and compact antenna test range | |
| CN211630732U (en) | Composite wave-absorbing shielding material | |
| CN108134213B (en) | Wide-frequency-band composite wave absorber and application thereof | |
| CN109219335B (en) | Broadband wave absorbing plate and manufacturing method thereof | |
| CN206259931U (en) | WiFi radio frequency structures and WiFi equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |