CN-119716776-B - Low scattering carrier for wing leading edge RCS test

CN119716776BCN 119716776 BCN119716776 BCN 119716776BCN-119716776-B

Abstract

The invention provides a low-scattering carrier for an airfoil front edge RCS test, which comprises a front edge cover plate and a carrier main body which are detachably connected, wherein the carrier main body and the carrier end face are of an integrally formed metal hollow structure, the front edge of the carrier main body is of a linear structure attached to an airfoil front edge wave absorbing structure, and the rear edge of the carrier main body is of a linear structure parallel to the front edge. The low-scattering carrier adopts a water drop-shaped design, the end face of the carrier and the carrier main body are integrally formed, and the parallel structure of the front edge and the rear edge of the airfoil is used, so that the influence of the edge on the scattering of an examination angle domain is reduced, the vertical polarization and horizontal polarization electromagnetic scattering characteristics of the carrier are greatly reduced, and the stealth performance of the carrier in various radar environments is further improved. The low-scattering carrier has good traveling wave inhibition effect, and in the range of 0-degree to 50-degree of an X wave band, the average value of RCS polarized in the horizontal direction can reach-45 dBsm, and the average value of RCS polarized in the vertical direction can reach-40 dBsm.

Inventors

LIU QI
HU JUN
YIN SHENG
CHENG BO
CHENG MING
WANG JUNPENG
LIU LIU

Assignees

航天科工武汉磁电有限责任公司

Dates

Publication Date: 20260512
Application Date: 20241210

Claims (7)

1. The low scattering carrier for RCS test of the airfoil front edge wave-absorbing structure is characterized by comprising a front edge cover plate (1), a carrier main body (2) and a carrier end face (3), wherein the front edge cover plate (1) is detachably connected with the carrier main body (2), the carrier main body (2) is of a flat strip-shaped structure with a thick middle and gradually flattened front and rear sides, and the front and rear ends of the carrier main body (2) are in a shape of thick water drops; the carrier end face (3) is arranged to be thick and thin and two ends which are respectively and correspondingly arranged on the flat strip-shaped structure of the carrier main body (2), two side lines of the carrier end face (3) are parallel, the carrier end face (3) and the carrier main body (2) are of an integrally formed metal hollow structure, and an included angle between the carrier end face (3) and the carrier main body (2) is larger than or equal to 65 degrees; The front edge (4) of the carrier main body (2) is of a linear structure attached to the airfoil front edge wave absorbing structure, a curved surface at the joint of the front edge cover plate (1) and the carrier main body (2) is tangent and continuous, no surface step is generated, and the rear edge (5) of the carrier main body (2) is of a linear structure parallel to the front edge (4).
2. A low scattering carrier for RCS testing of an airfoil leading edge wave absorbing structure according to claim 1, wherein the leading edge cover plate (1) is a cover plate structure attached to the front edge (4) side of the carrier body (2) and detachably provided on the front edge side of the carrier body.
3. A low scattering carrier for RCS test of airfoil leading edge wave absorbing structure according to claim 1, wherein the carrier end surface (3) is a flat cover plate structure with upper and lower curved surfaces shrunk into a curve.
4. A low scattering carrier for RCS testing of an airfoil leading edge wave absorbing structure as claimed in claim 1, wherein the carrier body (2) has a width of greater than or equal to 3.2 times the wavelength of the signal corresponding to the lowest frequency tested during RCS testing.
5. A low scattering carrier for RCS testing of an airfoil leading edge wave-absorbing structure as defined in claim 1, wherein said carrier has no surface step and a surface roughness of no greater than 1.6.
6. A low scattering carrier for RCS testing an airfoil leading edge wave absorbing structure as defined in claim 1, wherein the length of the low scattering carrier is 4300mm, The width of the low scattering carrier is 800mm, The height of the low scattering carrier is 200mm.
7. A low scattering carrier for RCS testing of an airfoil leading edge wave absorbing structure according to claim 1, wherein the leading edge cover plate (1) is removed and the airfoil leading edge wave absorbing structure is installed when the airfoil wave absorbing structure is tested, and the leading edge cover plate (1) is used for shielding the cavity of the low scattering carrier when the RCS of the low scattering carrier is verified.

Description

Low scattering carrier for wing leading edge RCS test Technical Field The invention relates to the field of electromagnetic scattering measurement, in particular to a low scattering carrier for an RCS test of a front edge of a wing. Background With the continuous development of radar detection technology, the stealth performance of the aircraft is required to be synchronously improved, the mirror scattering of the trailing edge of the airfoil leading edge is one of important scattering sources of the aircraft, and the radar stealth optimization design is necessary for improving the survivability of the aircraft. The main processing means in the prior art is to adopt a wave-absorbing structure design at the scattering source part to carry out wave-transmission, wave-absorbing, reflection, wave-absorbing and wave-transmission on radar incident waves, so as to reduce the intensity of reflected echo and reduce scattering. In the design and development process of the wave-absorbing structure, a large number of datamation tests and verification of simulation calculation results are required to be carried out continuously and iteratively. Because the full-size model or the wing part of the aircraft is larger than the static area of a common darkroom, RCS test cannot be performed, the low scattering carrier with the wave-absorbing structure is designed to perform RCS test, so that the low scattering carrier can enter the darkroom test, and meanwhile, the influence of a new scattering source on the test result caused by exposing the internal structure of the low scattering carrier with the independent test front edge is avoided. Patent CN114104331a discloses a wave absorber for reducing low frequency dispersion, the carrier for reducing low frequency dispersion approximates to diamond, and the carrier has the advantages of reducing low frequency dispersion of bottom edge of the part to be tested, wrapping the bottom edge of the part to be tested and shielding the inner cavity structure of the part to be tested during RCS test. But due to shape limitations, it is difficult to use low scattering carriers for the RCS test of elongated dihedral-like airfoil leading edge wave absorbing structures. Patent CN115856774a discloses a low scattering carrier for RCS test, the low scattering carrier is double-drop-shaped spliced structure, the carrier has better surface current guiding effect, can reduce strong scattering sources such as specular scattering and multiple scattering, and simultaneously can effectively avoid fluctuation of the carrier body in the low scattering angle domain. Also due to its shape limitations, it is difficult to use a low scattering carrier for the RCS test of an elongated dihedral-like airfoil leading edge wave absorbing structure. Patent CN114355311a discloses a low scattering carrier and a testing method for RCS test of airfoil front edge wave-absorbing structure, the low scattering carrier itself adopts a stealth design measure of appearance, is in a lower scattering level, and can be used for RCS test of airfoil front edge wave-absorbing structure due to the special structure of the carrier, and the testing method proposed based on the low scattering carrier can be directly applied to the low scattering carrier. The inventors have conducted a careful study of the low scattering carrier structure described above to provide a low scattering carrier for RCS testing of a wing leading edge wave-absorbing structure having a lower scattering level. Disclosure of Invention The invention mainly aims to provide a low-scattering carrier for an RCS test of a wing front edge, which adopts a water drop-shaped design, is integrally formed with a carrier end face and a carrier main body, and adopts an airfoil front edge and a rear edge parallel structure, so that the influence of edges on the scattering of an examination angle domain is reduced, the electromagnetic scattering characteristics of vertical polarization and horizontal polarization of the carrier are greatly reduced, the RCS mean value of horizontal polarization can reach-45 dBsm in the range of 0-50 degrees of an X wave band, and the RCS mean value of vertical polarization can reach-40 dBsm. In order to solve the technical problems, the invention adopts the following technical scheme: The low scattering carrier comprises a front edge cover plate, a carrier main body and a carrier end face, wherein the front edge cover plate is detachably connected with the carrier main body, the carrier main body is of a flat strip-shaped structure with a thick middle and gradually flattened front and rear sides, and the front and rear ends of the carrier main body are in a thick and thin water drop shape; The end faces of the carrier are arranged to be thick and thin, the end faces are respectively arranged at the two ends of the flat strip-shaped structure of the carrier body, the end faces are respectively arranged at the two ends of the flat strip-shaped struc