CN112606993A - Flap edge scattering suppression device - Google Patents
Flap edge scattering suppression device Download PDFInfo
- Publication number
- CN112606993A CN112606993A CN202011552819.0A CN202011552819A CN112606993A CN 112606993 A CN112606993 A CN 112606993A CN 202011552819 A CN202011552819 A CN 202011552819A CN 112606993 A CN112606993 A CN 112606993A
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- CN
- China
- Prior art keywords
- stealth
- flap
- tape
- stealthy
- wave
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
- B64C1/14—Windows; Doors; Hatch covers or access panels; Surrounding frame structures; Canopies; Windscreens accessories therefor, e.g. pressure sensors, water deflectors, hinges, seals, handles, latches, windscreen wipers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Abstract
The application belongs to the technical field of scattering suppression, and particularly relates to a flap edge scattering suppression device. The device is provided with stealthy sticky tape (3) at the surface of gap department that flap (1) and covering (2) combine, the width of stealthy sticky tape (3) is greater than the gap width, stealthy sticky tape (3) are including conducting layer, absorbing layer and infrared layer, the thickness of stealthy sticky tape (3) is not less than the thickness of absorbing wave coating (4) on covering and the flap, just stealthy sticky tape (3) and absorbing wave coating (4) smooth connection. The application of the method to the high stealth aircraft can effectively reduce the scattering of traveling waves on the surface of the aircraft, and has important significance for improving stealth performance of the aircraft.
Description
Technical Field
The application belongs to the technical field of scattering suppression, and particularly relates to a flap edge scattering suppression device.
Background
The radar waves acting on the surface of the aircraft excite the surface waves, the surface waves are not scattered in the transmission process, and strong scattering occurs when the surface waves are transmitted to electromagnetic defects (such as edges, gaps, steps and the like). When the surface wave irradiates the front edge of the wing in a V-V polarization mode and an elevation angle state, an incident wave and a reflected wave are superposed to form a traveling wave in an irradiation area (the lower surface of an airplane), the direction of an electric field of the traveling wave is perpendicular to the surface of the wing, the traveling wave is transmitted along the surface of a smooth object at a speed close to the speed of light, and an echo is generated when the traveling wave meets a discontinuous surface or a terminal structure, so that the scattering magnitude is very strong. In the shadow region (upper surface of the airplane), a creeping wave is generated, which is generated by an electric field perpendicular to the surface of the object, and also flows backwards along the surface of the object, with energy being attenuated during the flow.
With the continuous improvement of the stealth performance of the airplane, the inhibition capability of strong scattering sources such as a cockpit, a radar cabin and an air inlet channel is continuously enhanced, the influence of secondary weak scattering sources such as surface traveling waves of the airplane is also continuously improved, the surface electromagnetic defects of the conventional stealth airplane account for 1% of the influence on the stealth performance of the airplane, the surface electromagnetic defects of the high stealth airplane rise to 10% -20%, and the surface traveling wave scattering inhibition of the airplane becomes one of the key points of stealth design.
A large number of electromagnetic defects, such as steps, gaps, fasteners and the like, exist in the manufacturing process of the airplane, and traveling wave scattering is easily generated. The damage of the inherent characteristics (such as a cabin door, a port cover, a movable control surface, skin butt joint, a step, a fastener and the like) of the surface of the airplane due to factors such as design, production, process and the like to the stealth performance of the airplane becomes a main problem for restricting the improvement of the stealth capability of the airplane.
At present, the stealth aircraft adopts physical repair layers such as putty and the like, conductive coatings and wave-absorbing coatings to realize the inhibition of electromagnetic defects on the seam surfaces of the covering cap and the covering, and the typical schematic diagram of the covering cap is shown in figure 1. However, most of the flaps are frequently maintained and opened due to frequent maintenance of internal equipment and structures, and the flaps cannot be quickly opened and quickly restored by adopting a surface electromagnetic defect inhibition method of physical repair layers such as putty and the like, conductive coatings and wave-absorbing coatings, so that the use of an external field of an airplane is seriously influenced; the number of the full aircraft covers is large, the generated total gap is long, the electromagnetic defects of the fastening piece are large, and the contribution to the RCS of the aircraft is not ignored in the design of the high stealth aircraft, so that the implementation of stealth indexes is influenced.
The following problems exist in the surface electromagnetic defect suppression of the gap of the edge of the normally-opened cover of the existing airplane:
1) after the opening cover is opened, the surface electromagnetic defect inhibiting layer formed by the existing methods of putty, conductive coating and wave-absorbing coating can be damaged, and longer repair time is needed. Due to the high opening frequency of the flap, the use convenience and the easy maintenance of the airplane are reduced by using the method.
2) The cover has gaps and a large number of detachable fasteners, and scattering generated by surface electromagnetic defects is large.
3) There are still a few gaps with adjacent coatings after taping, and there is also a risk of air flow causing flaking during flight.
4) The adhesive tape material needs to simultaneously solve the balanced design of radar and infrared stealth.
Disclosure of Invention
In order to solve the problem, the application provides a flap edge scattering suppression device that stealthy sticky tape and supporting stealthy banding material combine can reduce the travelling wave scattering that gap, fastener brought by a wide margin on guaranteeing flap performance, promotes aircraft stealthy performance.
This application flap edge scattering suppression device is provided with stealthy sticky tape at the surface of gap department that flap and covering combine, the width of stealthy sticky tape is greater than the gap width, stealthy sticky tape includes conducting layer, ripples layer and infrared layer, the thickness of stealthy sticky tape is not less than the thickness of the ripples coating of inhaling on covering and the flap, just stealthy sticky tape and the smooth connection of ripples coating of inhaling.
Preferably, the infrared layer of the stealth tape is formed by spraying an infrared finish.
Preferably, the sealant is filled in the gap where the flap is combined with the skin.
Preferably, an edge sealing material is arranged between the stealth adhesive tape and the wave-absorbing coating.
Preferably, the stealth adhesive tape and the wave-absorbing coating are designed to have equal thickness.
Preferably, stealthy sticky tape thickness is greater than and inhales ripples coating thickness, and stealthy sticky tape is provided with the chamfer transition with inhaling ripples coating junction, and the length-to-height ratio of chamfer is 10: 1.
preferably, the stealth tape covers the gap and extends 20mm towards both sides of the rear of the gap.
Preferably, the stealthy adhesive tape is fixed on the cover and the skin in a pressure-sensitive adhesive pasting mode, and the pressure index of the pressure-sensitive adhesive is 8-10 Mpa.
The technical scheme that this application formed can effectively restrain the electromagnetic scattering that the flap gap of aircraft arouses, reduces secondary scattering RCS, and it is significant to improving the comprehensive stealthy performance of aircraft.
The application has the following advantages:
1) the technical scheme that the conducting/wave-absorbing/infrared stealth adhesive tape is used on the surfaces of the opening cover gap and the fastener, and the joint gap of the adhesive tape and the wave-absorbing coating is filled with the matched stealth edge sealing material is designed, so that an effective technical approach is provided for solving the technical problem of surface wave scattering inhibition of the normally open opening cover gap of the high stealth aircraft;
2) the stealth adhesive tape and the matched edge sealing material are adopted for stealth appearance design, so that the use and absorption efficiency of the stealth material is improved.
The application of the method to the high stealth aircraft can effectively reduce the scattering of traveling waves on the surface of the aircraft, and has important significance for improving stealth performance of the aircraft.
Drawings
FIG. 1 is a schematic view of a typical flap installation.
FIG. 2 is a schematic view of the tape and coating equal thickness structure of the scattering suppression device at the edge of the flap of the present application.
FIG. 3 is a schematic view of the tape and coating thickness variation of the flap edge scatter suppression apparatus of the present application.
The composite material comprises a base body, a cover, a skin, a stealth adhesive tape, a wave-absorbing coating, a sealant, an edge sealing material, a fastener and a base body, wherein the base body comprises 1-a cover, 2-a cover, 3-a stealth adhesive tape, 4-a wave-absorbing coating, 5-a sealant, 6-an edge sealing material, 7-a fastener and 8.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
The application aims at the requirement for restraining the secondary weak scattering source of the high stealth aircraft, combines the requirement for using and maintaining a normally open opening cover, designs a design scheme that a conductive/wave-absorbing/infrared stealth adhesive tape is used on the surface of a cover gap and a fastener, and the adhesive tape and a wave-absorbing coating joint gap are filled with a matched stealth edge sealing material, and adopts the following technical scheme.
Referring to fig. 1 and 2, the skin 2 is notched, and is sealed by the flap 1, and both the flap 1 and the skin 2 are fixed on the base 8 by the fastener 7.
This application flap edge scattering suppression device, as shown in fig. 2 and fig. 3, the surface of gap department that combines at flap 1 and covering 2 is provided with stealthy sticky tape 3, stealthy sticky tape 3's width is greater than the gap width, stealthy sticky tape 3 includes conducting layer, absorbing layer and infrared layer, stealthy sticky tape 3's thickness is not less than the thickness of absorbing wave coating 4 on covering and the flap, just stealthy sticky tape 3 and 4 smooth connections of absorbing wave coating.
This application shelters from gap and fastener between flap and peripheral structure through stealthy sticky tape, and stealthy sticky tape is installed when the flap is structural has a small amount of gaps with peripheral coating, needs to adopt the banding material to fill. The invisible adhesive tape is convenient to mount and dismount by adopting a mode of sticking the pressure-sensitive adhesive, and the reasonable binding force index requirement of the edge sealing material can ensure that the adhesive tape can be dismounted without stripping under air current scouring, so that the binding force index is determined to be 8-10 MPa. The conventional material has strong scattering and poor traveling wave suppression effect. In order to ensure the electromagnetic property and the wave-absorbing property, the stealth adhesive tape and the matched edge sealing material have the wave-absorbing capacity and the traveling wave attenuation capacity. Electromagnetic parameters of the stealth adhesive tape and the matched edge sealing material are equivalent to those of other wave-absorbing materials on the surface of the cabin door, so that a continuous stealth surface is formed, and traveling wave scattering is reduced to the maximum extent.
The stealthy sticky tape of this application has conducting layer, absorbing layer and infrared layer. The conducting layer shields electromagnetic defects such as gaps, fasteners and the like, and plays a role in electric continuity; the wave absorbing layer plays a role in absorbing radar waves; the infrared layer acts as an infrared radiation suppression.
In some optional embodiments, the stealth adhesive in the scheme has two types, one type is a conductive layer and a wave-absorbing layer, and infrared finish paint is integrally sprayed when the airplane leaves a factory; one is a conductive layer, a wave absorbing layer and an infrared layer, and is used after a cover is opened.
In some alternative embodiments, the seam where the flap 1 is bonded to the skin 2 is filled with a sealant 5.
In some alternative embodiments, an edge sealing material 6 is arranged between the stealth tape 3 and the wave-absorbing coating 4.
In some optional embodiments, the stealth adhesive tape 3 and the wave-absorbing coating 4 are designed to have the same thickness. In order to reduce the self scattering of the stealth adhesive tape, the appearance adopts the parallel design principle, namely the end face of the stealth adhesive tape is parallel to the edge of the airplane body, and the edge scattering of the stealth adhesive tape can be 'fused' into the strong scattering wave crest of the airplane body through the parallel design, so that the strong scattering angle domain of the airplane is reduced.
Figure 2 is stealth sticky tape and the equal-thickness schematic diagram of wave-absorbing coating of flap surface, and figure 3 is stealth sticky tape and the unequal-thickness schematic diagram of wave-absorbing coating of flap surface, as shown in figure 3, if stealth sticky tape thickness is greater than the wave-absorbing coating of flap surface, the stealth sticky tape needs to carry out the chamfer design, makes its edge and flap surface wave-absorbing coating equal-thickness to reduce edge scattering, and the length-height ratio l of chamfer: h is 10: 1.
the width of the stealth adhesive tape is larger than the total width of gaps between the cover and the peripheral structure and fasteners, and the stealth adhesive tape extends inwards and outwards by 20mm respectively so as to ensure that the gaps are completely covered by the stealth adhesive tape.
The application has the following advantages:
1) the technical scheme that the conducting/wave-absorbing/infrared stealth adhesive tape is used on the surfaces of the opening cover gap and the fastener, and the joint gap of the adhesive tape and the wave-absorbing coating is filled with the matched stealth edge sealing material is designed, so that an effective technical approach is provided for solving the technical problem of surface wave scattering inhibition of the normally open opening cover gap of the high stealth aircraft;
2) the stealth adhesive tape and the matched edge sealing material are adopted for stealth appearance design, so that the use and absorption efficiency of the stealth material is improved.
The application of the method to the high stealth aircraft can effectively reduce the scattering of traveling waves on the surface of the aircraft, and has important significance for improving stealth performance of the aircraft. Simulation and test verification results show that the RCS of the airplane can be improved by more than 3dB by applying the stealth adhesive tape and the matched edge sealing material.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a flap edge scattering suppression device, its characterized in that is provided with stealthy sticky tape (3) at the surface of gap department that flap (1) and covering (2) combine, the width of stealthy sticky tape (3) is greater than the gap width, stealthy sticky tape (3) are including conducting layer, absorbing layer and infrared layer, the thickness of stealthy sticky tape (3) is not less than the thickness of absorbing wave coating (4) on covering and the flap, just stealthy sticky tape (3) and absorbing wave coating (4) smooth connection.
2. The flap edge scatter suppression apparatus according to claim 1, characterized in that the infrared layer of the masking tape (3) is formed by spraying an infrared finish.
3. A flap edge scatter suppressing device according to claim 1, characterized in that the gap where the flap (1) is joined to the skin (2) is filled with a sealant (5).
4. The flap edge scatter suppression apparatus according to claim 1, wherein an edge sealing material (6) is disposed between the stealth tape (3) and the wave-absorbing coating (4).
5. The flap edge scatter suppression apparatus according to claim 1, wherein the stealth tape (3) and the wave-absorbing coating (4) are of equal thickness design.
6. The flap edge scatter suppression apparatus according to claim 1, wherein the stealth tape (3) has a thickness greater than the wave-absorbing coating (4), and the stealth tape (3) is provided with a chamfer transition at the junction with the wave-absorbing coating (4), the chamfer having a length to height ratio of 10: 1.
7. the flap edge scatter suppression apparatus according to claim 1, wherein said stealth tape (3) extends 20mm on each rearward side of said gap.
8. The device for suppressing scattering at the edge of a covering cap as claimed in claim 1, wherein the stealth adhesive tape (3) is fixed on the covering cap and the covering skin by means of pressure-sensitive adhesive, and the pressure index of the pressure-sensitive adhesive is 8-10 Mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011552819.0A CN112606993B (en) | 2020-12-24 | 2020-12-24 | Flap edge scattering suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011552819.0A CN112606993B (en) | 2020-12-24 | 2020-12-24 | Flap edge scattering suppression device |
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| Publication Number | Publication Date |
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| CN112606993A true CN112606993A (en) | 2021-04-06 |
| CN112606993B CN112606993B (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011552819.0A Active CN112606993B (en) | 2020-12-24 | 2020-12-24 | Flap edge scattering suppression device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716013A (en) * | 2021-10-08 | 2021-11-30 | 湖南航天环宇通信科技股份有限公司 | A can abandon formula flap that is used for unmanned aerial vehicle gasbag pressurization to uncap and unmanned aerial vehicle thereof |
| CN114104331A (en) * | 2021-11-12 | 2022-03-01 | 北京环境特性研究所 | Wave absorber for reducing low-frequency scattering |
| CN114933864A (en) * | 2022-06-27 | 2022-08-23 | 航天科工武汉磁电有限责任公司 | Electromagnetic repairing paste and preparation method thereof |
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|---|---|
| CN112606993B (en) | 2023-07-21 |
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