CN114355311A - Low-scattering carrier for RCS (Radar Cross section) test of airfoil leading edge wave-absorbing structure and test method - Google Patents
Low-scattering carrier for RCS (Radar Cross section) test of airfoil leading edge wave-absorbing structure and test method Download PDFInfo
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Abstract
The invention provides a low-scattering carrier for an RCS test of a wave-absorbing structure of a leading edge of an airfoil and a test method thereof, and the low-scattering carrier can be used for the RCS test of the wave-absorbing structure of the leading edge of the airfoil due to the special structure of the low-scattering carrier.
Description
Technical Field
The invention belongs to the field of electromagnetic scattering measurement, and particularly relates to a low-scattering carrier for an RCS (radar cross section) test of an airfoil leading edge wave-absorbing structure and a test method.
Background
One of the ways to process the mirror scattering of the leading edge of the wing surfaces of the aircraft, such as the wing and the tail wing, is to design the leading edge sweepback angle of the wing and the tail wing to be larger than 45 degrees so as to shift the leading edge mirror scattering echo to be outside the forward +/-45-degree sector, but the measure can bring adverse effects, for example, for the wing, the excessively large sweepback angle can reduce the lift line slope and the maximum lift coefficient of the wing, even the phenomenon of 'pitch up' can occur, so that the aircraft is out of control, therefore, the leading edge sweepback angle of the wing of a general fighter plane is between 35 degrees and 45 degrees, for example, the leading edge sweepback angle of an F-22 plane is 42 degrees, and the leading edge sweepback angle of an F-35 plane is 33 degrees. When the sweep angle of the front edge of the wing is less than 45 degrees, mirror scattering wave peaks of the left wing front edge and the right wing front edge exist in a forward +/-45-degree range on a curve of the RCS of the aircraft along with the change of azimuth angles, and the current main processing means is to adopt a wave absorbing structure at the front edge to absorb incident waves of a radar and reduce the intensity of backward reflected echoes of the radar.
In the development process of the front edge wave-absorbing structure, a large number of designability tests are required, and parameter optimization and simulation calculation result verification are performed. If the wing leading edge wave-absorbing structure is installed on a full-size model or a wing part of an aircraft and is directly used for RCS (Radar Cross section) test, the full-size model or the wing part cannot be implemented due to the fact that the size of the full-size model or the wing part is larger than the size of a common darkroom dead zone; on the other hand, if the wave absorbing structure of the leading edge of the airfoil is only tested separately, once the wave absorbing structure is separated from the wing, the edge of the wave absorbing structure and the internal structure of the wing are completely exposed, and a new scattering source is introduced, so that the accuracy of the test is influenced. The effective solution is to use the low scattering carrier of the wave-absorbing structure of the leading edge of the airfoil, on one hand, the size of the low scattering carrier is far smaller than that of a full-size model or a wing part of the aircraft and is in the range of a darkroom dead zone; on the other hand, the low-scattering carrier can eliminate the edge scattering of the wave-absorbing structure and the disordered scattering caused by the internal structure; the scattering level of the low scattering carrier is 1-2 orders of magnitude lower than that of the target to be detected, and the wave-absorbing structure is arranged on the low scattering carrier, so that the effect of reducing the peak value of the leading edge of the airfoil by the wave-absorbing structure can be embodied.
The invention discloses a low-scattering carrier for RCS (Radar Cross section) tests, which is disclosed by China patent publication No. CN 106428625A, published 2017, 2 and 22, and the name of the invention is a low-scattering carrier for RCS tests. The carrier has the advantages that the edge scattering of the component can be eliminated during RCS testing, and the inner cavity structure of the component is shielded. But due to the limitation of the shape, the low-scattering carrier is difficult to be used for the RCS test of the slender airfoil leading edge wave-absorbing structure.
Chinese patent publication No. CN 109212504 a, publication No. 2019, 1 month 15, the name of the utility model is a low scattering carrier that gives consideration to both forward and lateral designs, and this application discloses a low scattering carrier that gives consideration to both forward and lateral angular domains simultaneously, and the carrier disclosed in this application is diamond-shaped, and its advantage is that it has good surface current guiding effect, effectively reduces the contribution of traveling wave scattering, and all has lower scattering level in forward and lateral directions. Also, it is disadvantageous because of its flat shape limitation, it is difficult to use as a low scattering carrier for the RCS test of an elongated airfoil leading edge wave absorbing structure.
The invention discloses a Chinese patent publication No. CN 111504952B, published as 2020, 8, 7, and discloses a low scattering carrier with both horizontal and vertical polarization and a test method thereof, the application discloses a low scattering carrier with both horizontal and vertical polarization and a test method thereof, the carrier disclosed by the application is in a diamond shape with a back end turned downwards, the advantage is that a set of carriers can be used for completing the test of two polarizations, the defect is that the test carrier is mainly designed aiming at the stealth test of an antenna and an exposed object, is in a flat diamond shape, and is difficult to be used as a low scattering carrier for the RCS test of a slender airfoil leading edge wave-absorbing structure.
The Chinese patent publication No. CN 112834997A, published on 2021, 5 month, 25 days, is named as a low scattering carrier shape design method with a rectangular opening characteristic, and the application discloses a low scattering carrier shape design method with a rectangular opening characteristic.
Therefore, a low-scattering carrier for RCS test of the wave-absorbing structure of the leading edge of the airfoil is urgently needed.
Disclosure of Invention
The invention provides a low-scattering carrier for an RCS test of a wave-absorbing structure of a leading edge of an airfoil and a test method thereof aiming at the requirements of the prior art.
The specific implementation content of the invention is as follows:
the invention provides a low-scattering carrier for an RCS test of an airfoil leading edge wave-absorbing structure, which is used for the RCS test of the airfoil leading edge wave-absorbing structure; the low-scattering carrier comprises a front edge cover plate and a carrier main body;
the carrier main body is a flat strip-shaped structure which is transversely arranged, and the strip-shaped structure of the carrier main body is a metal hollow structure which is thick in the middle and gradually flattened at the front side and the rear side of the appearance structure; the cross section of the carrier body in the thickness direction is in a water drop shape with a blunt front and a sharp rear;
the front edge of the strip-shaped structure of the carrier main body is a linear structure attached to the airfoil front edge wave-absorbing structure, and the curved surface at the joint of the front edge cover plate and the carrier main body is tangent and continuous; the rear edge of the long strip-shaped structure of the carrier main body is a linear structure which is not parallel to the front edge, and the included angle between the normal lines of the front edge and the rear edge is more than or equal to 10 degrees;
the front edge cover plate is a cover plate structure attached to one side of the front edge of the carrier main body and detachably arranged on one side of the front edge of the carrier main body.
In order to better implement the present invention, further, the low scattering carrier further comprises a carrier end face; the end surface of the carrier is a flat cover plate structure with an upper curved surface and a lower curved surface which are contracted into a curve; the carrier end face is provided with a big end and a small end which are detachably arranged on the flat strip-shaped structure of the carrier main body correspondingly, so that a structure capable of fixing the front edge cover plate on the carrier main body is formed.
To better practice the invention, further, the narrower end of the carrier body has a width greater than or equal to 3.2 times the wavelength of the signal corresponding to the lowest frequency tested in the RCS test.
To better implement the present invention, further, the length of the low scattering carrier is smaller than the quiet zone size of the test site when the RCS test is performed.
In order to better implement the invention, further, the surface roughness Ra of the low-scattering carrier is less than or equal to 1.6.
The invention also provides a low-scattering carrier-based RCS (radar cross section) test method for the wave-absorbing structure of the leading edge of the airfoil, which is based on the RCS test method for the wave-absorbing structure of the leading edge of the airfoil; the method comprises the following steps:
step S1: carrying out darkroom background test;
step S2: selecting a horn antenna according to the signal wave band tested by the RCS and installing the horn antenna;
step S3: setting a polarization mode;
step S4: mounting the front edge cover plate on the carrier main body, and covering the butt seam of the front edge cover plate and the carrier main body by using an aluminum foil;
step S5: placing the low scattering carrier on a rotary table for RCS test, wherein the length direction of the low scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S6: RCS test of all-metal low-scattering carrier is carried out, and test data values are recorded
Step S7: taking down a front edge cover plate of the low-scattering carrier, installing the airfoil front edge wave-absorbing structure on the carrier main body, and covering the butt seam of the airfoil front edge wave-absorbing structure and the carrier main body by using aluminum foil;
step S8: placing the low-scattering carrier provided with the airfoil leading edge wave-absorbing structure on a turntable, wherein the length direction of the low-scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S9: carrying out RCS test on the low-scattering carrier after installing the wave-absorbing structure of the leading edge of the airfoil, and recording a test data value;
step S10: comparing the test data value results of the step S6 and the step S9 to obtain the reduction of the leading edge peak value of the metal of the low-scattering carrier by the airfoil leading edge wave-absorbing structure;
step S11: repeating the steps S3-S10 to finish the RCS test of all polarization modes under one frequency;
step S12: and repeating the steps S2-S11 to finish the RCS test at all the frequencies.
Compared with the prior art, the invention has the following advantages and beneficial effects:
compared with the prior art, the carrier can be used for RCS test of the wave-absorbing structure at the leading edge of the airfoil surface due to the special structure, eliminates the edge scattering of the wave-absorbing structure and the disordered scattering caused by the internal structure, and is at a lower scattering level due to the adoption of the invisible appearance design measure. The test method provided by the invention can be directly used for RCS test after the carrier is additionally provided with the airfoil leading edge wave-absorbing structure, and the reduction effect of the leading edge wave-absorbing structure on the mirror surface scattering peak value is obtained.
Drawings
FIG. 1 is a flow chart of a test method of the present invention;
FIG. 2 is an isometric view of the present invention with the leading edge cover plate not mounted on the carrier body;
FIG. 3 is an isometric view of the present invention with a leading edge cover plate mounted on a carrier body;
FIG. 4 is a top view of the present invention with the leading edge cover plate installed on the carrier body;
FIG. 5 is a cross-sectional view of a cross-section of the present invention taken anywhere along the thickness of the carrier body with a leading edge cover plate mounted thereon;
FIG. 6 is a plot of RCS versus azimuth angle for C-band horizontal polarization (HH) and vertical polarization (VV) when a leading edge cover plate of an embodiment of the present invention is mounted on a carrier body;
FIG. 7 is a plot of RCS versus azimuth angle for X-band horizontal polarization (HH) and vertical polarization (VV) when a leading edge cover plate of an embodiment of the present invention is mounted on a carrier body;
FIG. 8 is a plot of RCS versus azimuth angle for both Ku band horizontal polarization (HH) and vertical polarization (VV) when a leading edge cover plate of an embodiment of the present invention is mounted on a carrier body.
Wherein: 1. front edge cover plate 2, carrier body 3, carrier end face 4, front edge 5, rear edge 6 and butt seam.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the embodiment provides a low-scattering carrier for an RCS test of an airfoil leading edge wave-absorbing structure, which is used for the RCS test of the airfoil leading edge wave-absorbing structure; as shown in fig. 2, 3, 4, and 5, the low-scattering carrier includes a leading-edge cover plate 1 and a carrier body 2;
the carrier main body 2 is a flat strip-shaped structure which is transversely arranged, and the strip-shaped structure of the carrier main body 2 is a metal hollow structure which is thick in the middle and gradually flattened at the front side and the rear side of the appearance structure; the cross section of the carrier main body 2 in the thickness direction is in a water drop shape with a blunt front and a sharp rear;
the front edge 4 of the strip-shaped structure of the carrier main body 2 is a linear structure attached to the wave-absorbing structure of the front edge of the airfoil, and the curved surface at the joint of the front edge cover plate 1 and the carrier main body 2 is tangent and continuous; the rear edge 5 of the strip-shaped structure of the carrier main body 2 is a linear structure which is not parallel to the front edge, and the included angle of the normals of the front edge 4 and the rear edge 5 is more than or equal to 10 degrees;
the front edge cover plate 1 is a cover plate structure attached to one side of the front edge 4 of the carrier main body 2 and detachably arranged on one side of the front edge 4 of the carrier main body 2.
The working principle is as follows: as shown in fig. 2, 3 and 5, the carrier adopts a metal hollow structure to reduce weight, the surface roughness Ra is not more than 1.6, the carrier is composed of a front edge cover plate 1, a carrier main body 2 and a carrier end surface 3, the carrier is flat and long, one side of the carrier front edge cover plate is a head, the opposite side is a rear part, the appearance of the front edge cover plate 1 is the same as that of the airfoil front edge wave-absorbing structure, the carrier is used for being installed on the carrier main body and used for testing the RCS of the all-metal carrier, the airfoil front edge wave-absorbing structure can be disassembled and installed in situ, the upper and lower curved surfaces of the carrier end surface 3 are contracted into a curve and are flat, the curved edge diffraction replaces the carrier end surface to adopt the mirror surface scattering brought by a plane, and the lateral RCS is reduced.
As shown in fig. 4, the rear edge 5 and the front edge 4 of the carrier are not parallel in plan view, and the included angle between the normal lines of the rear edge and the front edge 4 is 10 degrees, so that the problem that the reduction effect of the front edge wave-absorbing structure on the mirror surface scattering peak is difficult to distinguish due to the coincidence of the shadow region scattering peak and the carrier front edge mirror surface scattering peak generated when electromagnetic waves are incident right opposite to the rear edge of the carrier under vertical polarization is avoided.
Example 2:
in this embodiment, on the basis of the above embodiment 1, in order to better implement the present invention, further, as shown in fig. 2 and fig. 3, the low scattering carrier further includes a carrier end surface 3; the end surface 3 of the carrier is a flat cover plate structure with an upper curved surface and a lower curved surface which are contracted into a curve; the carrier end face 3 is provided with a large end and a small end which are detachably arranged on the flat strip-shaped structure of the carrier main body 2 correspondingly, so that a structure capable of fixing the front edge cover plate 1 on the carrier main body 2 is formed.
Further, the width of the narrower end of the carrier body 2 is greater than or equal to 3.2 times the wavelength of the signal corresponding to the lowest frequency tested in the RCS test.
Further, the length of the low scattering carrier is smaller than the size of a dead space of a test site when an RCS test is carried out.
The working principle is as follows: the upper and lower curved surfaces of the carrier end surface 3 are contracted into a curve and are flat, and the edge diffraction of the curve replaces the mirror surface scattering brought by a plane on the carrier end surface, so that the lateral RCS is reduced. The length of the carrier is less than the quiet zone size of the test site.
For metal spheres, when satisfy
And is
Wherein d is the diameter of the metal ball,
for the incident wavelength, the metal ball is positioned in the optical area, so that for the low-scattering carrier, the size of the low-scattering carrier is 3.2 times larger than the wavelength corresponding to the lowest frequency in the test process, the size of the carrier in the width direction is positioned in the optical area of electromagnetic scattering, the problems that the RCS is violently oscillated along with the frequency change caused by the fact that the carrier is positioned in the resonance area due to undersize of the carrier are avoided, and the RCS reduction effect is not obvious due to the appearance stealth measure are solved. The curved surface at the joint of the front edge cover plate 1 and the carrier main body 2 is tangent and continuous along the width direction of the carrier, so that the problem of introducing a new weak scattering source due to discontinuous appearance change is avoided, and the cross section of the carrier is in a water drop shape with a blunt front part and a sharp rear part.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3:
in this embodiment, the principle of arrangement of the respective components is further explained based on any of the above embodiments 1 to 2:
as shown in fig. 2 and 3, the carrier adopts a metal hollow structure to reduce weight, the surface roughness Ra is not more than 1.6, the carrier is composed of a front edge cover plate 1, a carrier main body 2 and a carrier end surface 3, the carrier is in a flat strip shape, one side of the carrier front edge cover plate is a head part, the opposite side of the carrier front edge cover plate is a rear part, the appearance of the front edge cover plate 1 is the same as that of the airfoil front edge wave-absorbing structure, the carrier is used for being installed on the carrier main body and used for testing the RCS of the all-metal carrier, the airfoil front edge wave-absorbing structure can be disassembled and installed in situ, the upper curved surface and the lower curved surface of the carrier end surface 3 are contracted into a curve and are in a flat shape, the edge diffraction of the curve replaces the mirror surface scattering brought by the carrier end surface and the plane, and the lateral RCS is reduced.
As shown in fig. 4, the length of the airfoil leading edge wave-absorbing carrier to be tested is 1500mm, the total length of the carrier is smaller than the size of a dead zone of a darkroom, and the length L =1800mm is taken; the lowest frequency band tested is a C wave band, the wavelength corresponding to the central frequency is 50mm, the width of the narrower end of the carrier is more than or equal to 3.2 times of the wavelength corresponding to the lowest frequency tested, in the embodiment, W1=160mm is selected, so that the size of the carrier in the width direction is in an optical area of electromagnetic scattering, and the problems that the RCS is in a resonant area due to the fact that the size of the carrier is too small, the RCS is severely oscillated along with the frequency change, and the RCS reduction effect is not obvious due to the appearance stealth measure are avoided; the rear edge 5 and the front edge 4 of the carrier are not parallel in the plan view, and the included angle between the normal lines of the rear edge 5 and the front edge 4 is 10 degrees, so that the problem that the reduction effect of the front edge wave-absorbing structure on the mirror surface scattering peak is difficult to distinguish due to the fact that the shadow region scattering peak and the carrier front edge mirror surface scattering peak generated when electromagnetic waves are incident right to the rear edge of the carrier under vertical polarization are superposed is solved.
As shown in FIG. 5, the curved surface at the joint of the front edge cover plate 1 and the carrier main body 2 is tangent and continuous along the width direction of the carrier, so that the problem of introducing a new weak scattering source due to discontinuous shape change is solved, and the profile of the carrier is in a drop shape with a blunt front part and a sharp rear part, so that the scattering of the rear edge 5 is reduced.
Other parts of this embodiment are the same as any of embodiments 1-2 described above, and thus are not described again.
Example 4:
the embodiment also provides an RCS testing method for the low-scattering carrier-based airfoil leading edge wave-absorbing structure, as shown in fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, the RCS testing method for the low-scattering carrier-based airfoil leading edge wave-absorbing structure is based on the RCS testing method; the method comprises the following steps:
step S1: carrying out darkroom background test;
step S2: selecting a horn antenna according to the signal wave band tested by the RCS and installing the horn antenna;
step S3: setting a polarization mode;
step S4: mounting the front edge cover plate 1 on the carrier body 2, and covering the butt seam 6 of the front edge cover plate 1 and the carrier body 2 by using aluminum foil;
step S5: placing the low scattering carrier on a rotary table for RCS test, wherein the length direction of the low scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S6: RCS test of all-metal low-scattering carrier is carried out, and test data values are recorded
Step S7: taking down the leading edge cover plate 1 of the low-scattering carrier, installing the airfoil leading edge wave-absorbing structure on the carrier main body 2, and covering the airfoil leading edge wave-absorbing structure and the butt seam 6 of the carrier main body 2 by using aluminum foil;
step S8: placing the low-scattering carrier provided with the airfoil leading edge wave-absorbing structure on a turntable, wherein the length direction of the low-scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S9: carrying out RCS test on the low-scattering carrier after installing the wave-absorbing structure of the leading edge of the airfoil, and recording a test data value;
step S10: comparing the test data value results of the step S6 and the step S9 to obtain the reduction of the leading edge peak value of the metal of the low-scattering carrier by the airfoil leading edge wave-absorbing structure;
step S11: repeating the steps S3-S10 to finish the RCS test of all polarization modes under one frequency;
step S12: and repeating the steps S2-S11 to finish the RCS test at all the frequencies.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
in this embodiment, based on any one of the above embodiments 1 to 4, as shown in fig. 6, 7 and 8, a curve of RCS along with the change of azimuth after the front edge cover plate 1 is installed on the carrier body 2 and calculated by using the multi-layer fast multipole algorithm simulation is shown, wherein the direction of 0 ° is that the electromagnetic wave is incident directly on the front edge 4 of the carrier.
As can be seen from FIGS. 6, 7, and 8, except for the horizontal polarization 0 ° peak, and the vertical polarization-10 ° peak and 0 ° peak, RCS is lower than-20 dBsm at most azimuth angles in horizontal polarization HH, and is lower than-30 dBsm at most azimuth angles in vertical polarization VV, and the carrier is at a lower scattering level through the shape stealth design; because the rear edge 5 and the front edge 4 of the carrier are not parallel in the plan view, the included angle between the normal lines of the rear edge 5 and the front edge 4 is 10 degrees, the shadow region scattering peak generated when the electromagnetic wave under vertical polarization is incident over against the rear edge of the carrier is positioned at an azimuth angle of-10 degrees and is distinguished from the carrier front edge mirror surface scattering peak, and the reduction effect of the front edge wave absorbing structure on the front edge mirror surface scattering peak can be obviously displayed.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A low-scattering carrier for RCS test of an airfoil leading edge wave-absorbing structure is used for RCS test of the airfoil leading edge wave-absorbing structure; the device is characterized by comprising a front edge cover plate (1) and a carrier main body (2);
the carrier main body (2) is of a transversely arranged flat strip-shaped structure, and the appearance structure of the strip-shaped structure of the carrier main body (2) is in a hollow water drop shape with one blunt end and the other sharp end;
the front edge (4) of the strip-shaped structure of the carrier main body (2) is a linear structure attached to the wave-absorbing structure of the front edge of the airfoil, and the curved surface at the joint of the front edge cover plate (1) and the carrier main body (2) is tangent and continuous; the rear edge (5) of the strip-shaped structure of the carrier main body (2) is a linear structure which is not parallel to the front edge, and the included angle between the normals of the front edge (4) and the rear edge (5) is more than or equal to 10 degrees;
the front edge cover plate (1) is a cover plate structure attached to one side of the front edge (4) of the carrier main body (2) and detachably arranged on one side of the front edge (4) of the carrier main body (2).
2. The low-scattering carrier for the RCS test of the airfoil leading edge wave-absorbing structure according to claim 1, wherein the low-scattering carrier further comprises a carrier end face (3); the end surface (3) of the carrier is a flat cover plate structure with an upper curved surface and a lower curved surface which are contracted into a curve; the carrier end face (3) is provided with a big end and a small end which are detachably arranged on the flat strip-shaped structure of the carrier main body (2) correspondingly, so that the structure that the front edge cover plate (1) is detachably fixed on the carrier main body (2) is formed.
3. The low-scattering carrier for the RCS test of the airfoil leading edge wave-absorbing structure according to claim 1 or 2, wherein the width of one of two ends of the carrier body (2), which is narrower than the other end, is greater than or equal to 3.2 times of the wavelength of a signal corresponding to the lowest frequency tested in the RCS test.
4. The low-scattering carrier for the RCS test of the airfoil leading edge wave-absorbing structure according to claim 1 or 2, wherein the length of the low-scattering carrier is less than the size of a dead space of a test field when the RCS test is carried out.
5. The low-scattering carrier for the RCS test of the airfoil leading edge wave-absorbing structure according to claim 1 or 2, wherein the surface roughness Ra of the low-scattering carrier is less than or equal to 1.6.
6. An RCS test method of an airfoil leading edge wave-absorbing structure based on a low-scattering carrier, which is based on the RCS test of the airfoil leading edge wave-absorbing structure of claim 1, 2, 3, 4 or 5; the method is characterized by comprising the following steps:
step S1: carrying out darkroom background test;
step S2: selecting a horn antenna according to the signal wave band tested by the RCS and installing the horn antenna;
step S3: setting a polarization mode;
step S4: mounting the front edge cover plate (1) on the carrier main body (2), and covering the butt seam (6) of the front edge cover plate (1) and the carrier main body (2) by using aluminum foil;
step S5: placing the low scattering carrier on a rotary table for RCS test, wherein the length direction of the low scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S6: RCS test of all-metal low-scattering carrier is carried out, and test data values are recorded
Step S7: taking down a leading edge cover plate (1) of the low-scattering carrier, installing the airfoil leading edge wave-absorbing structure on a carrier main body (2), and covering the airfoil leading edge wave-absorbing structure and a butt seam (6) of the carrier main body (2) by using aluminum foil;
step S8: placing the low-scattering carrier provided with the airfoil leading edge wave-absorbing structure on a turntable, wherein the length direction of the low-scattering carrier is parallel to the 0-degree direction of incident electromagnetic waves;
step S9: carrying out RCS test on the low-scattering carrier after installing the wave-absorbing structure of the leading edge of the airfoil, and recording a test data value;
step S10: comparing the test data value results of the step S6 and the step S9 to obtain the reduction of the leading edge (4) peak value of the metal of the low-scattering carrier by the airfoil leading edge wave-absorbing structure;
step S11: repeating the steps S3-S10 to finish the RCS test of all polarization modes under one frequency;
step S12: and repeating the steps S2-S11 to finish the RCS test at all the frequencies.
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|---|---|---|---|---|
| CN115184887A (en) * | 2022-09-14 | 2022-10-14 | 北京环境特性研究所 | Wing leading edge scattering unit, aircraft radar target and design method |
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| CN115184887A (en) * | 2022-09-14 | 2022-10-14 | 北京环境特性研究所 | Wing leading edge scattering unit, aircraft radar target and design method |
| CN115184887B (en) * | 2022-09-14 | 2023-01-20 | 北京环境特性研究所 | Wing leading edge scattering unit, aircraft radar target and design method |
| CN117554657A (en) * | 2024-01-10 | 2024-02-13 | 中国汽车技术研究中心有限公司 | Auxiliary installation fixing device and fixing method for vehicle |
| CN117554657B (en) * | 2024-01-10 | 2024-03-22 | 中国汽车技术研究中心有限公司 | Auxiliary installation fixing device and fixing method for vehicle |
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