Underwater double-layered cross-shaped combined dihedral angle acoustic reflector structure

Abstract

The application provides a kind of underwater double-layer cross combination dihedral reflector structure, which comprises two cross-shaped reflectors, each reflector comprises a long rectangular plate and two short rectangular plates, the top and bottom of the whole reflector are four-jaw flange, the middle is eight-jaw flange, and screw holes are arranged on the flange, screw rods are arranged on the upper and lower ends of each rectangular plate, the rectangular plate and the four-narrow-strip flange are connected by screw rods and screw holes, and each layer of reflector is connected by eight-jaw flange, the size of the upper and lower reflectors is consistent, and the rotation difference along the cross axis is 45 degrees. The application solves the problem of poor angle consistency of single dihedral reflector target strength, and solves the problem of adding a power system for attitude control when using a single angle reflector as an underwater acoustic standard body in the prior art. The application has the advantages of simple structure and low cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underwater acoustic standard bodies, and particularly relates to a structure of a double-layer cross-combined dihedral angle acoustic reflector. BACKGROUND

[0002] When the target strength of an underwater target is measured by a comparison method, a standard reflector with known target strength is needed as a reference target. Common reference targets include spheres, cylinders and corner reflectors. The sphere and the cylinder have axial symmetry, and the sound waves have good angle consistency when incident in different directions. However, when a large target strength is needed, the volume of the sphere or the cylinder target will become very large, so that the measurement implementation is not feasible. The corner reflector has the advantages of small volume and large target strength, but the target strength consistency of a single corner reflector at different angles is poor.

[0003] In order to avoid the problem of poor target consistency in angles, Chinese patent ZL202110566100.0 discloses a suspended underwater acoustic standard body with real-time adjustment of posture, which adds a posture control power system to the corner reflector, so that the angle with strong echo is always stable at the sound wave incident angle, and realizes the technical scheme of using the corner reflector as an underwater acoustic standard body. Although the posture control can realize the stability of the corner reflector in the angle direction, this method is complex and has high cost. SUMMARY

[0004] Therefore, in order to solve the problems of the prior art mentioned in the background that the corner reflector as an underwater acoustic standard body needs to be equipped with a posture control power system, the system is complex and has high cost, the application provides a structure of a double-layer cross-combined dihedral angle acoustic reflector.

[0005] To achieve the above purpose, the application adopts the following technical scheme: a structure of a double-layer cross-combined dihedral angle acoustic reflector, comprising two reflectors arranged above and below, the two reflector structures are consistent in size, and both are cross-shaped, the two reflectors are rotated by 45 degrees along the cross axis, and are connected through eight-claw flange pieces.

[0006] Each reflector comprises four-claw flange pieces and a body, the four-claw flange pieces are arranged at the end side of the body, the body comprises one long rectangular plate and two short rectangular plates, and the two short rectangular plates are arranged vertically on both sides of the long rectangular plate.

[0007] Further, the long rectangular plate and the short rectangular plate are consistent in thickness, and the sum of the length and the thickness of the two short rectangular plates is equal to the length of the long rectangular plate.

[0008] Further, the adjacent narrow strips of the four-claw flange pieces are 90 degrees, and each narrow strip flange piece is consistent in size.

[0009] Further, the eight claw flange adjacent narrow strip angle is 45 degrees, and each narrow strip flange size is consistent.

[0010] Further, the short rectangular plate and long rectangular plate upper and lower end face are provided with screw rod.

[0011] Further, the eight claw flange and four claw flange are provided with screw hole at equal interval.

[0012] Further, the short rectangular plate and long rectangular plate are solid plates with strong anti-sound ability.

[0013] Further, the short rectangular plate and long rectangular plate surface is smooth.

[0014] Further, the diameter length of the eight claw flange and four claw flange is equal to the length of the long rectangular plate.

[0015] Further, the narrow strip width of the eight claw flange and four claw flange is equal to the width of the long rectangular plate and short rectangular plate.

[0016] Compared with the prior art, the underwater double-layered cross-combined dihedral angle acoustic reflector structure has the following beneficial effects:

[0017] 1. The cross-combined dihedral angle reflector structure is adopted to realize strong echo in a horizontal 360-degree range, and the double-layered structure is adopted to realize consistency of echo at different angles, so that the strong echo performance with good consistency is realized in the horizontal 360-degree range.

[0018] 2. For the reflector with limited reflection angle, the attitude of the reflector needs to be controlled by a power system to make the incident wave be in the reflection area. The reflector structure has strong echo in the horizontal 360-degree range, so that the incident wave is only needed to be in the horizontal direction when used, and the attitude of the reflector structure does not need to be controlled. In addition, the reflector structure has the advantages of simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0020] Figure 1 is a schematic view of the underwater double-layered cross-combined dihedral angle acoustic reflector structure according to the present application;

[0021] Figure 2 is a schematic view of the eight narrow strip flanges according to the present application;

[0022] is a schematic view of the eight narrow strip flanges according to the present application;Figure 3 is a schematic diagram of a long rectangular plate of the present application;

[0023] Figure 4 is a schematic diagram of a short rectangular plate of the present application;

[0024] Figure 5 is a schematic diagram of a four-narrow-strip flange of the present application.

[0025] Wherein, 1 - reflector, 2 - eight-prong flange, 3 - long rectangular plate, 4 - short rectangular plate, 5 - four-prong flange. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only some of the embodiments of the present application, not all of the embodiments.

[0027] I. Specific implementation mode one, see Figures 1-5 It is described that in this embodiment, an underwater double-layer cross-shaped combined dihedral angle acoustic reflector structure includes two reflectors 1 arranged in an upper and lower manner, the two reflectors 1 have consistent structural sizes and are both cross-shaped, the two reflectors 1 are rotated by 45 degrees along a cross axis and are connected through an eight-prong flange 2.

[0028] Each reflector 1 includes a four-prong flange 5 and a body, the four-prong flange 5 is arranged at an end side of the body, the body includes one long rectangular plate 3 and two short rectangular plates 4, and the two short rectangular plates 4 are arranged in a perpendicular manner on both sides of the one long rectangular plate 3.

[0029] The working principle that the two reflectors 1 are rotated by 45 degrees along the cross axis is as follows: the period of a single reflector is 90 degrees, in each period, the target intensity also presents symmetry due to the structural symmetry. At the initial and final positions (0°, 90°), the target intensity reaches a maximum value due to the contribution of a primary echo; in the middle angle range, the target intensity has a relatively large value due to the contribution of a secondary echo, and reaches a maximum value at 45°; and near the initial and final positions, the target intensity is a minimum value due to the lack of the contribution of the primary echo and the attenuation of the secondary echo to a very low value, and therefore, the target intensity-angle consistency in the period is poor.

[0030] The present application adopts a double-layer angle reflector 1 combination mode, the two reflectors 1 are rotated by 45 degrees along the cross axis, and according to the above analysis, after being rotated by 45 degrees, the minimum value of the upper and lower layers will correspond to the vicinity of the maximum value of the other layer, so that the maximum value and the minimum value of the upper and lower layers can neutralize and offset each other, and the fluctuation of the target intensity is greatly reduced.

[0031] The long rectangular plate 3 is consistent with the thickness of the short rectangular plate 4, and the length and thickness of the two short rectangular plates 4 are equal to the length of the long rectangular plate 3.

[0032] The adjacent narrow strips of the four-claw flange 5 are 90 degrees, and the size of each narrow strip is consistent; the adjacent narrow strips of the eight-claw flange 2 are 45 degrees, and the size of each narrow strip is consistent.

[0033] The length of the narrow strip of the flange is equal to the length of the long rectangular plate 3, and the width of the narrow strip is equal to the thickness of the rectangular plate; the long rectangular plate 3 is provided with a screw rod at equal intervals; the eight-claw flange 2 and the four-claw flange 5 are provided with screw holes at equal intervals.

[0034] The long rectangular plate 3, the short rectangular plate 4, the eight-claw flange 2 and the four-claw flange 5 are the same wedge surface or curved surface at the longitudinal edge. Because the side surface of the rectangular plate is a plane, it will produce a mirror surface wave, which will affect the target echo characteristics of the reflector 1, so the longitudinal edge of the rectangular plate and the flange is designed as a wedge surface or a curved surface.

[0035] The short rectangular plate 4 and the long rectangular plate 3 are solid plates with strong sound reflection ability. Because the characteristic impedance of the solid plate is completely mismatched with the characteristic impedance of water, it has strong sound reflection ability.

[0036] The surface of the short rectangular plate 4 and the long rectangular plate 3 is smooth and flat. Because the uneven surface will scatter the incident wave and reduce the target strength itself.

[0037] As shown in Figure 2 , the size of each narrow strip of the eight-claw flange 2 is consistent, the adjacent narrow strips are 45 degrees, and the same screw holes are provided, combined with Figure 1 , the upper and lower two layers of reflectors 1 are connected into a double-layer cross structure by the eight-claw flange 2, and the connection mode is screw rod-screw hole connection.

[0038] As shown in Figure 3 , Figure 4 , the upper and lower surfaces of the rectangular plates 3 and 4 are provided with equal-distance screw rods, as shown in Figure 5 , the four narrow strips of the four-claw flange 5 are consistent in size, the adjacent narrow strips are 90 degrees, and screw holes are provided at the corresponding positions, and the long rectangular plate 3 and the short rectangular plate 4 are connected into a reflector 1 by the four-claw flange 5, and the connection mode is screw rod-screw hole connection.

[0039] The diameter length of the flange 2, 5 should be equal to the length of the long rectangular plate 3; the width of the narrow strip of the flange 2, 5 should be equal to the width of the rectangular plate 3, 4.

[0040] The rectangular plates 3 and 4 can be square or rectangular thin plates, preferably rectangular thin plates, and are preferably made of thin steel plates, aluminum plates or other materials with sufficient hardness. Since the selected material is mostly steel plate, the manufacturing process is not easy to be completed in one step, and the final structure is a mechanical structure with multiple parts spliced. The splicing process should ensure that the gap at the connection is small enough or has no gap, so as to ensure that the acoustic reflection performance of the structure is not affected.

[0041] Specific use method of the underwater double-layer cross-shaped combined dihedral angle acoustic reflector structure:

[0042] In use, the double-layer cross-shaped combined dihedral angle acoustic reflector structure is horizontally hung; when the incident wave is incident, it is incident from the horizontal direction, and the structure has the characteristics of good target strength-angle consistency in the horizontal angle range, so that the target strength of the target to be measured can be measured.

[0043] The above disclosed embodiments of the present application are only used to help explain the present application. The embodiments do not describe all the details and do not limit the present application to the specific embodiments described. According to the content of the present application, many modifications and changes can be made. The present application selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application.

Claims

1. An underwater acoustic reflector structure, characterized in that: It includes two reflectors (1) set at the top and bottom. The two reflectors (1) have the same structural dimensions and are both cross-shaped. The two reflectors (1) are rotated 45 degrees apart along the cross axis and are connected by an eight-claw flange (2). Each reflector (1) includes a four-claw flange (5) and a body. The four-claw flange (5) is disposed on the end side of the body. The body includes a long rectangular plate (3) and two short rectangular plates (4). The two short rectangular plates (4) are vertically disposed on both sides of the long rectangular plate (3). The underwater acoustic reflector structure adopts a combination of two-layer corner reflectors (1). The two reflectors (1) are rotated 45° along the cross axis. After rotating 45°, the minimum value of the upper and lower layers will correspond to the maximum value of the other layer. The maximum and minimum values ​​of the upper and lower layers can neutralize and cancel each other, greatly reducing the fluctuation of the target intensity.

2. The underwater acoustic reflector structure according to claim 1, characterized in that: The long rectangular plate (3) and the short rectangular plate (4) have the same thickness, and the sum of the length and thickness of the two short rectangular plates (4) is equal to the length of the long rectangular plate (3).

3. The underwater acoustic reflector structure according to claim 1, characterized in that: The four-jaw flange (5) includes four narrow flanges with an included angle of 90 degrees, and each narrow flange has the same size.

4. The underwater acoustic reflector structure according to claim 1, characterized in that: The eight-claw flange (2) includes eight narrow flanges with an included angle of 45 degrees, and each narrow flange has the same size.

5. The underwater acoustic reflector structure according to claim 1, characterized in that: The short rectangular plate (4) and the long rectangular plate (3) are provided with screws on their upper and lower end faces.

6. The underwater acoustic reflector structure according to claim 5, characterized in that: Both the eight-claw flange (2) and the four-claw flange (5) are provided with screw holes at equal intervals.

7. The underwater acoustic reflector structure according to claim 1, characterized in that: The short rectangular plate (4) and the long rectangular plate (3) are solid plates with strong sound reflection capabilities.

8. The underwater acoustic reflector structure according to claim 1, characterized in that: The surfaces of the short rectangular plate (4) and the long rectangular plate (3) are flat and smooth.

9. The underwater acoustic reflector structure according to claim 1, characterized in that: The diameter of the eight-claw flange (2) and the four-claw flange (5) is equal to the length of the long rectangular plate (3), and the width of the narrow strip of the eight-claw flange (2) and the four-claw flange (5) is equal to the width of the long rectangular plate (3) and the short rectangular plate (4).

10. The underwater acoustic reflector structure according to claim 1, characterized in that: The long rectangular plate (3), the short rectangular plate (4), the eight-claw flange (2), and the four-claw flange (5) have the same wedge-shaped surface or curved surface at their longitudinal edges.

Images