A low-scattering carrier for RCS testing of trapezoidal cone structures

Abstract

The present application relates to the technical field of RCS test, and particularly relates to a low-scattering carrier for RCS test of trapezoidal conical structure. The embodiment of the present application provides a low-scattering carrier for trapezoidal conical structure, which comprises a shell provided with an open end, the open end being used for arranging the trapezoidal conical structure, a first sharp corner being arranged at one end of the shell far from the open end, and the shell being divided into two symmetrical parts by a symmetrical surface; from the first sharp corner to the open end, a longitudinal section perpendicular to the symmetrical surface changes from a point to a special trapezoid, the area of the special trapezoid first increases and then decreases, the special trapezoid is obtained by deforming a trapezoid, and four sides of the trapezoid change into curves to form the special trapezoid. The embodiment of the present application provides a low-scattering carrier for RCS test of trapezoidal conical structure, and can provide a low-scattering carrier for trapezoidal conical structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of RCS testing, and particularly relates to a low-scattering carrier for RCS testing of a trapezoidal cone structure. BACKGROUND

[0002] Now, with the development of radar detection technology, in order to improve the survivability of an aircraft, it is necessary to optimize the low-scattering design of the aircraft layout. However, after the overall low-scattering design of the aircraft is completed, due to the limitations of research funds and experimental platforms and other factors, a component-level split evaluation method is mostly adopted. When the major components are separated from the whole machine, the edges, surfaces and other structures that did not exist before will be exposed. If no measures are taken, these exposed structures will have a serious impact on the test and evaluation of the components. In order to more accurately evaluate the RCS indicators of the components, the edges, surfaces and other structures that are not exposed need to be shielded to simulate the actual installation state.

[0003] In the prior art, there is a lack of a low-scattering carrier for a trapezoidal cone structure. SUMMARY

[0004] The embodiment of the present application provides a low-scattering carrier for RCS testing of a trapezoidal cone structure, and can provide a low-scattering carrier for a trapezoidal cone structure.

[0005] The embodiment of the present application provides a low-scattering carrier for a trapezoidal cone structure, which comprises a shell provided with an open end, the open end is used for arranging a trapezoidal cone structure, one end of the shell away from the open end is a first acute angle, and the shell is divided into two symmetrical parts through a symmetrical surface.

[0006] From the first acute angle to the open end, a longitudinal section perpendicular to the symmetrical surface changes from a point to a special trapezoid, the area of the special trapezoid first increases and then decreases, and the special trapezoid is obtained by deforming a trapezoid, and four edges of the trapezoid change into curves to form the special trapezoid.

[0007] In a possible design, the low-scattering carrier further comprises a test body, the test body comprises a butt joint end, the butt joint end is the same in size and shape as the open end, the butt joint end is matched and connected with the open end, and the test body is used for smoothly connecting with the shell to perform RCS testing on the low-scattering carrier.

[0008] One end of the test body away from the butt joint end is a second acute angle, the vertex of the second acute angle is located in the symmetrical surface, and from the second acute angle to the butt joint end, a longitudinal section perpendicular to the symmetrical surface changes from a point to the special trapezoid, and the area of the special trapezoid gradually increases.

[0009] In a possible design, the horizontal projection of the first sharp angle and the horizontal projection of the second sharp angle are both 20-80 degrees.

[0010] In a possible design, the horizontal projection of the first sharp angle is greater than the horizontal projection of the second sharp angle.

[0011] In a possible design, among the tangents of the four curves of the special trapezoidal shape, the tangents passing through the four points of the special trapezoidal shape form four included angles, and the angles of the four included angles are 70 degrees, 110 degrees, 70 degrees, and 110 degrees, respectively.

[0012] In a possible design, the roughness Ra of the low-scattering carrier is less than 1.6.

[0013] In a possible design, the test body or trapezoidal conical structure is connected to the shell through a flange to realize a stepless connection.

[0014] In a possible design, after the test body or trapezoidal conical structure is connected to the shell, an aluminum foil is pasted at the gap part of the connection.

[0015] In a possible design, after the test body is connected to the shell, the length of the low-scattering carrier is 0.8-3 m.

[0016] After the test body is connected to the shell, the width of the low-scattering carrier is 0.2-1 m.

[0017] After the test body is connected to the shell, the height of the low-scattering carrier is 0.1-1 m.

[0018] In a possible design, the test body is a hollow structure.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] In the embodiment, after the open end of the shell is connected to the trapezoidal conical structure, the edge scattering of the trapezoidal conical structure is eliminated, and the outer surface structure is shielded, the actual installation state of the trapezoidal conical structure is better simulated, a lower backscattering is achieved in a larger angular range, the RCS test of the trapezoidal conical structure is not affected, and the RCS of the trapezoidal conical structure can be more accurately measured and evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] Figure 1 is a schematic diagram of a low-scattering carrier structure provided by an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of a low-scattering carrier structure provided by an embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a low-scattering carrier structure provided by an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a shell structure provided by an embodiment of the present application.

[0026] In the drawings:

[0027] 1 - shell;

[0028] 2 - test body. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integrally connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] In the description of the specification, it needs to be understood that the "upper", "lower" and other orientation words described in the embodiments of the application are described in the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the application. In addition, in the context, it also needs to be understood that when referring to one element connected to another element "on" or "below", it can not only be directly connected to another element "on" or "below", but also indirectly connected to another element "on" or "below" through an intermediate element.

[0032] As shown in Figure 1 , 2 , 3, 4, the embodiments of the application provide a low scattering carrier for trapezoidal conical structure, which comprises a shell provided with an open end, the open end is used to set the trapezoidal conical structure, and the end of the shell away from the open end is a first acute angle, and the shell is divided into two symmetrical parts by a symmetry plane.

[0033] From the first acute angle to the open end, the longitudinal section perpendicular to the symmetry plane changes from a point to a special trapezoid, the area of the special trapezoid first increases and then decreases, and the special trapezoid is obtained by deforming a trapezoid, and the four sides of the trapezoid are changed into curves to form the special trapezoid.

[0034] In this embodiment, after the open end of the shell is connected with the trapezoidal conical structure, the edge scattering of the trapezoidal conical structure is eliminated, and the outer surface structure is also shielded, which better simulates the state of the trapezoidal conical structure during actual installation, has low back scattering in a large angular range, does not affect the RCS test of the trapezoidal conical structure, and can more accurately measure and evaluate the RCS of the trapezoidal conical structure.

[0035] It needs to be noted that the shell composed of a curved surface and having the first acute angle has the characteristics of low scattering, the cross section and the open end are special trapezoids, and the special trapezoids match the trapezoidal conical structure, so that the trapezoidal conical structure can be smoothly installed on the open end. The special trapezoid cross section matches the trapezoidal conical structure, if other shapes, the effect of reducing scattering will be greatly reduced. In addition, the mode of setting the open end matched with the trapezoidal conical structure for connection can also reduce the material cost, and the hollow structure has obvious advantages in transportation and cost.

[0036] In some embodiments of the application, a test body is further included, the test body comprises a butt joint end, the butt joint end is the same size and shape as the open end, and the butt joint end is matched and connected with the open end. The test body is used to smoothly connect with the shell to perform RCS test on the low scattering carrier.

[0037] The end of the test body away from the butt joint end is a second acute angle, the vertex of the second acute angle is located in the symmetry plane, and the longitudinal section perpendicular to the symmetry plane of the test body changes from a point to a special trapezoid from the second acute angle to the butt joint end, and the area of the special trapezoid gradually increases.

[0038] In the embodiment, before the shell is used, the low scattering performance of the shell needs to be tested, and in order to avoid more scattering at the open end, the open end needs to be covered when testing, therefore, the test body is designed, in order to reduce the low scattering to the greatest extent, the test body is provided with a second acute angle, and the butt joint end is matched with the open end. The curvature of the test body and the surface of the shell is continuous, has high surface finish, and the joint of the two is very small and has no step difference of the curved surface. The carrier after the test body is connected with the shell is a shuttle-shaped body with a front acute angle and a rear acute angle, and is symmetrical along the line connecting the two acute angles. The shuttle-shaped body is derived from the shuttle-shaped structure, in order to reduce the mirror scattering of the two ends, the two ends are designed as acute angles. When the acute angle is composed of two straight lines, the acute angle is formed by the two straight lines; when the acute angle is composed of a curve, the acute angle is formed by the tangent line along the curve.

[0039] The low scattering carrier with the above design has good surface current guiding effect, because the surface curvature is relatively continuous and has no concave cavity and other structures, and there is no mirror reflection, multiple reflection and other strong scattering sources on the surface. When the carrier is verified, the carrier has low scattering characteristics relative to the tested target, and has little influence on the evaluation of the target. In actual testing, the RCS of the low scattering carrier is much better than that of the tested target with the trapezoidal cone structure. In addition, the size and weight of the low scattering carrier are controlled within the test capacity of the experimental platform.

[0040] In some embodiments of the present application, the angle of the horizontal projection of the first acute angle and the second acute angle is 20-80°.

[0041] In the embodiment, the angle of the horizontal projection of the first acute angle and the second acute angle is between 20 degrees and 80 degrees. According to the electromagnetic scattering theory, the size of the front end angle and the rear end angle of the carrier determines the low scattering angle domain of the low scattering carrier, therefore, it is extremely important to select a suitable acute angle for the special size requirement of the RCS angle domain.

[0042] In some embodiments of the present application, the angle of the horizontal projection of the first acute angle is greater than the angle of the horizontal projection of the second acute angle.

[0043] In the embodiment, the second acute angle is one end for receiving the test electromagnetic wave, therefore, the angle needs to be smaller than the second acute angle, so as to further reduce the scattering.

[0044] In some embodiments of the present application, among the tangent lines of the four curves of the special trapezoid, the tangent lines passing through the four points of the special trapezoid form four angles, and the angles of the four angles are 70°, 110°, 70° and 110° respectively.

[0045] In some embodiments of the present application, the roughness Ra of the low scattering carrier is less than 1.6.

[0046] In some embodiments of the present application, the test body or trapezoidal cone structure is connected with the shell through a flange to achieve a stepless connection.

[0047] In some embodiments of the present application, after the test body or trapezoidal cone structure is connected with the shell, an aluminum foil is pasted on the gap part of the connection.

[0048] In some embodiments of the present application, after the test body is connected with the shell, the length of the low-scattering carrier is 0.8-3m;

[0049] After the test body is connected with the shell, the width of the low-scattering carrier is 0.2-1m;

[0050] After the test body is connected with the shell, the height of the low-scattering carrier is 0.1-1m.

[0051] In some embodiments of the present application, the test body is a hollow structure.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-scattering carrier for a trapezoidal cone structure (RCS) test, characterized by, The application relates to a low-scattering carrier, which comprises a shell provided with an open end for arranging a trapezoidal cone structure, wherein one end of the shell away from the open end is a first acute angle, and the shell is divided into two symmetrical parts by a symmetrical plane; from the first acute angle to the open end, the longitudinal section perpendicular to the symmetrical plane changes from a point into a special trapezoid, the area of the special trapezoid first increases and then decreases, the special trapezoid is obtained by deforming a trapezoid, and four edges of the trapezoid change into curves to form the special trapezoid; the low-scattering carrier further comprises a test body, which comprises a butt joint end, the butt joint end is the same in size and shape as the open end, the butt joint end is matched and connected with the open end, and the test body is used for smoothly connecting with the shell to perform RCS (Radar Cross Section) testing on the low-scattering carrier; one end of the test body away from the butt joint end is a second acute angle, the vertex of the second acute angle is located in the symmetrical plane, the longitudinal section perpendicular to the symmetrical plane changes from the second acute angle to the butt joint end into the special trapezoid, and the area of the special trapezoid gradually increases; the horizontal projection angle of the first acute angle and the second acute angle is 20-80 degrees; the horizontal projection angle of the first acute angle is larger than that of the second acute angle; among the tangents of four curves of the special trapezoid, the tangents passing through four points of the special trapezoid form four included angles, and the angles of the four included angles are 70 degrees, 110 degrees, 70 degrees and 110 degrees respectively; after the test body is connected with the shell, the length of the low-scattering carrier is 0.8-3 m; after the test body is connected with the shell, the width of the low-scattering carrier is 0.2-1 m; after the test body is connected with the shell, the height of the low-scattering carrier is 0.1-1 m; and the test body is a hollow structure. The roughness Ra of the low-scattering carrier is less than 1.

6. The test body or the trapezoidal cone structure is connected with the shell through a flange to realize stepless connection. After the test body or the trapezoidal cone structure is connected with the shell, an aluminum foil is pasted on the gap part of the connection. ​ ​ ​ ​ ​ ​ ​ 2. The low-scattering carrier of claim 1, wherein, ​ 3. The low-scattering carrier of claim 1, wherein, ​ 4. The low-scattering carrier of claim 3, wherein, ​

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