Fixing support for installing hydrophone by using olive-shaped structure

Abstract

According to the fixing support for installing the hydrophone through the olivary structure, the left fixing support body and the right fixing support body are embedded and fixed into the olivary nucleus-shaped polyurethane watertight layer, and accurate positioning and fixing of the hydrophone are achieved; the left bracket and the right bracket are designed into two pieces with different thicknesses, and the protruding olivary nucleus is designed at the edge of the hydrophone, so that the most sensitive cylindrical surface of the hydrophone can avoid interference of fixed connection to the greatest extent. Compared with the scheme of a traditional hydrophone fixing support, under the condition that the installation difficulty of the hydrophone is not changed, low interference is achieved, and the high refitting capacity of a sensitive surface outer support shell layer is reserved at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of underwater acoustic sensors, and in particular, relates to a fixing bracket for mounting a hydrophone using an olive-shaped structure, and in particular to a fixing bracket for fixing a towed array hydrophone using an offset olive-core structure used in a towed linear array. Background Art

[0002] In applications such as ocean exploration, environmental monitoring, and military reconnaissance, hydrophones, as important sensing devices, are widely used to receive and analyze sound waves.

[0003] A towed array sonar is an array hydrophone system deployed by towing, which can provide acoustic wave data with high spatial resolution and is effectively used for underwater acoustic detection. At present, the hydrophones in the towed array are usually installed in the form of a fixed bracket, which is characterized by being able to fix the relative axial and radial positions of the hydrophones in the towed array to form a detection array that meets the formation requirements of signal processing; at the same time, it plays a supporting role in maintaining the ideal cylindrical shape of the towed array, which can suppress the towing noise to a certain extent, and is conducive to underwater target detection; in addition, it has a protective effect on the hydrophone to prevent the hydrophone from being damaged by external forces. For example, patent document CN101598594A discloses a fiber optic hydrophone towed array protection bracket, which includes: a main bracket, a first bracket and a second bracket for supporting and connecting the two ends thereof; the first bracket and the second bracket, located at both ends of the main bracket, are used to fix the hydrophone and support the external protective sleeve in the towed array; and a hole formed on the main bracket for acoustic field coupling.

[0004] However, there are still some problems in the design of the hydrophone fixing bracket. The most important problem is how to achieve the noise suppression of the hydrophone. The commonly used design method is to use a sandwich combination of "fixed bracket, soft material, and hydrophone". Generally, a sound-transparent soft material such as polyurethane is selected as the watertight outer layer of the towed array hydrophone, which completely wraps the surface of the hydrophone to avoid direct contact with the fixed bracket; then the polyurethane watertight layer is fixedly connected to the fixed bracket at the center position to achieve precise positioning of the hydrophone.

[0005] However, with the requirement of thinning the towed array, the original noise suppression design can no longer meet the requirements of towed array sonar; one of the points is that as the towed array becomes thinner, the diameter of the hydrophone bracket is reduced, and the bracket shell between the hydrophone sensitive surface and the bracket outer surface is getting thinner and thinner. In the original design, the fixed bracket can be regarded as a vibrating whole, but now it is necessary to consider the vibration interference of the bracket shell outside the sensitive surface independently. Therefore, in order to obtain a fixed bracket with lower interference, it is necessary to further design the bracket shell outside the sensitive surface. The original design of the polyurethane watertight layer fixedly connected to the fixed bracket at the center position greatly limits the space for further design of the bracket shell outside the sensitive surface. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a fixing bracket for installing a hydrophone using an olive-shaped structure.

[0007] According to the present invention, a fixing bracket for installing a hydrophone using an olive-shaped structure comprises: a bracket front plate 1, a bracket rear plate 2, and a polyurethane watertight layer;

[0008] The polyurethane watertight layer comprises: an olive-shaped watertight layer 301 and a cylindrical sensitive layer 302 covering the cylindrical surface of the entire hydrophone 3;

[0009] The bracket front plate 1 and the bracket rear plate 2 are assembled to form a hollow cylinder, and the hollow cylinder can be embedded with a hydrophone 3 wrapped with a polyurethane water-tight layer;

[0010] The front plate 1 of the bracket and the rear plate 2 of the bracket clamp the olive-shaped watertight layer 301 to fix the hydrophone 3.

[0011] Preferably, the bracket front plate 1 is thinner than the bracket rear plate 2 ; except for the thickness, the bracket rear plate 2 has other structures that are mirror-symmetrical to the bracket front plate 1 .

[0012] Preferably, the bracket back plate 2 completely covers the cylindrical sensitive layer 302 in radial direction, and the bracket back plate 2 provides a design modification of the bracket shell layer outside the sensitive surface.

[0013] Preferably, the bracket front plate 1 is a hollow cylindrical structure, the radial outer surface is a standard cylindrical surface, and the inner surface in contact with the bracket rear plate 2 is provided with a fixing groove in the shape of half of the hydrophone olive area 301; the surface of the bracket rear plate 2 facing the bracket front plate 1 is provided with a fixing groove in the shape of the other half of the hydrophone olive area 301.

[0014] Preferably, a groove in the shape of an olive-shaped watertight layer 301 is opened on the side where the front plate 1 and the rear plate 2 of the bracket contact each other, and the hydrophone 3 is fixed by clamping the olive-shaped watertight layer 301; at this time, the cylindrical sensitive layer 302 has no contact with the hollow cylinder.

[0015] Preferably, according to the towing direction, the bracket front plate 1 is in front of the bracket rear plate 2 ; the bracket front plate 1 and the bracket rear plate 2 are fixed by fasteners through bolt screw holes 102 .

[0016] Preferably, in the radial direction, a portion of the olive-shaped watertight layer 301 protrudes from the cylindrical sensitive layer 302 .

[0017] Preferably, the hollow cylinder is provided with a data line hole 101 , a screw and bolt fixing hole 102 , and a Kevlar rope fixing hole 103 .

[0018] Preferably, the data line holes 101 on the bracket front plate 1 and the bracket rear plate 2 are smooth cylindrical surfaces.

[0019] Preferably, the Kevlar rope fixing holes 103 on the bracket front plate 1 and the bracket rear plate 2 also have olive-shaped fixing grooves; the bracket front plate 1 and the bracket rear plate 2 are fixed to the Kevlar rope by tightly clamping the olive core in the Kevlar rope.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention achieves low interference and high stability without changing the difficulty of installing the hydrophone, thereby improving the detection capability of the towed array hydrophone.

[0022] 2. The present invention can reduce direct contact with the hydrophone and avoid interfering with the changes in the sound pressure in the hydrophone receiving space;

[0023] 3. The outer fixing bracket shell of the hydrophone coating layer in the present invention is a complete independent cylinder, which is convenient for secondary modification, such as radial opening;

[0024] 4. The components of the present invention are easy to disassemble and assemble, and can be repaired and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 3D schematic diagram of the overall structure of the offset olive core fixing bracket according to an embodiment of the present invention;

[0027] Figure 2 is a two-dimensional cross-sectional schematic diagram of an offset olive core fixing bracket according to an embodiment of the present invention;

[0028] Figure 3 is a simulation diagram of the sound pressure sensitivity (dB) of the hydrophone according to an embodiment of the present invention, wherein the abscissa represents the operating frequency band and the ordinate represents the sound pressure sensitivity;

[0029] The figure shows:

[0030] DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] The present invention proposes a fixed bracket for fixing a towed array hydrophone using an offset olive core structure. The left and right fixed brackets are embedded with a polyurethane watertight layer in the shape of an olive core to achieve precise positioning and fixation of the hydrophone. The left and right brackets are designed to be two pieces of different thicknesses, and the protruding olive core is designed at the edge of the hydrophone, so that the most sensitive cylindrical surface of the hydrophone can avoid interference from the fixed connection to the greatest extent. Compared with the traditional solution of the hydrophone fixed bracket, the present invention achieves low interference and retains a high modification capability for the bracket shell outside the sensitive surface without changing the difficulty of installing the hydrophone. The offset means that, unlike the traditional solution in which the position of the fixed hydrophone is set at the center of the bracket, the embodiment of the present invention is offset at the head of the hydrophone (circular tube); because the hydrophone is still placed in the center of the bracket, the fixing structure, i.e., the olive core, is offset.

[0033] Figure 1 3D schematic diagram of the overall structure of the offset olive core fixing bracket according to an embodiment of the present invention, which provides space for further design of the bracket shell outside the sensitive surface. Figure 1 As shown in the embodiment, the fixing bracket for mounting the hydrophone using an olive-shaped structure comprises: a bracket front plate 1, a bracket rear plate 2, and a polyurethane watertight layer of the hydrophone 3; the bracket front plate 1 is thinner than the bracket rear plate 2; the bracket front plate 1 and the bracket rear plate 2 are assembled to form a hollow cylinder, and the hydrophone 3 to be fixed is embedded in the hollow cylinder. The olive shape refers to a closed two-dimensional figure composed of two inferior arcs. The outline cross section of the olive core is an olive shape.

[0034] The hollow cylinder is provided with a data cable hole 101, a screw and bolt fixing hole 102, and a Kevlar rope fixing hole 103; the data cable hole 101 on the bracket front plate 1 and the bracket rear plate 2 is a smooth cylindrical surface; the Kevlar rope fixing hole 103 on the bracket front plate 1 and the bracket rear plate 2 also has an olive-shaped fixing groove; the bracket front plate 1 and the bracket rear plate 2 are fixed on the Kevlar rope by tightly clamping the olive core in the Kevlar rope.

[0035] Except for the different thickness, the other structures of the bracket rear plate 2 are mirror-symmetrical with the bracket front plate 1; according to the towing direction, the bracket front plate 1 is in front of the bracket rear plate 2; the bracket front plate 1 and the bracket rear plate 2 are fixed by fasteners through bolt screw holes 102; the hydrophone 3 is cylindrical, with a watertight layer wrapped on the surface, and the material is polyurethane. The top surface of the hydrophone 3 is cast into an olive-shaped watertight layer 301 that is relatively convex in the radial direction to form an olive-shaped area, and the cylindrical sensitive layer 302 forms a standard cylindrical surface; the bracket rear plate 2 completely covers the cylindrical sensitive layer 302 radially, and the bracket rear plate 2 is modified, such as radially punching holes, to achieve the design modification of the bracket shell outside the sensitive surface. Specifically, the bracket front plate 1 axially opens a data cable hole 101, a screw and bolt fixing hole 102, and a Kevlar rope fixing hole 103; the polyurethane watertight layer of the hydrophone 3 includes an olive-shaped watertight layer 301 and a cylindrical sensitive layer 302 covering the entire cylindrical surface of the hydrophone. The bracket front plate 1 is a hollow cylindrical structure, whose radial outer surface is a standard cylindrical surface, and the inner surface in contact with the bracket rear plate 2 is provided with a fixing groove in the shape of half of the hydrophone olive area 301; the surface of the bracket rear plate 2 facing the bracket front plate 1 is provided with a fixing groove in the shape of the other half of the hydrophone olive area 301.

[0036] Figure 2 is a two-dimensional cross-sectional schematic diagram of an offset olive core fixing bracket according to an embodiment of the present invention. Figure 2 As shown in the embodiment, a groove in the shape of an olive-shaped watertight layer 301 is opened on the side where the front plate 1 of the bracket and the rear plate 2 of the bracket contact each other, and the hydrophone 3 is fixed by clamping the olive-shaped watertight layer 301; at this time, the cylindrical sensitive layer 302 has no contact with the hollow cylinder.

[0037] The front plate 1 and the rear plate 2 of the bracket use the same olive-shaped groove to fix themselves on the braided rope passing through the bracket. An olive-shaped positioning piece is buried in the braided rope to locate the position of the bracket. The braided rope is made of Kevlar and the positioning piece is made of aluminum alloy. The hydrophone 3 is watertightly connected to the cable. The offset olive core fixing bracket of the embodiment of the present invention is assembled.

[0038] Figure 3 This is a simulation diagram of the acoustic pressure sensitivity (dB) of the hydrophone in the offset olive-core fixed bracket of the embodiment of the present invention. The working frequency band is in the low frequency band of 100 to 2000 Hz. As shown in the embodiment of the figure, when the fixed hydrophone 3 is working, the cylindrical sensitive layer 302 remains in a non-contact state with the bracket front plate 1 and the bracket rear plate 2. Compared with the center fixing method, the fixed hydrophone 3 has a higher receiving sensitivity in the low frequency band. Specifically, for the circular tube hydrophone fixed by the bracket, if the fixing structure, i.e., the olive core, is in the middle section, the structure will apply a certain prestress on the most sensitive cylindrical middle section of the hydrophone, thereby slightly affecting the sensitivity of the hydrophone; while in the present invention, the olive core is offset at the head of the hydrophone circular tube, which will not affect the cylindrical middle section.

[0039] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A fixing bracket for mounting a hydrophone using an olive-shaped structure, characterized in that: include: A support front plate (1), a support rear plate (2), and a polyurethane watertight layer; The polyurethane watertight layer comprises: an olive-shaped watertight layer (301) and a cylindrical sensitive layer (302) covering the cylindrical surface of the entire hydrophone (3); The support front plate (1) and the support rear plate (2) are assembled to form a hollow cylinder, and the hollow cylinder can be embedded with a hydrophone (3) wrapped with a polyurethane water-tight layer; The support front plate (1) and the support rear plate (2) clamp the olive-shaped watertight layer (301) to fix the hydrophone (3).

2. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: The support front plate (1) is thinner than the support rear plate (2); except for the difference in thickness, the support rear plate (2) is mirror-symmetrical with the support front plate (1) in other structures.

3. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: The bracket rear plate (2) completely covers the cylindrical sensitive layer (302) in radial direction, and the bracket rear plate (2) provides a design modification of the bracket shell layer outside the sensitive surface.

4. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 2, characterized in that: The support front plate (1) is a hollow cylindrical structure, the radial outer surface is a standard cylindrical surface, and the inner surface in contact with the support rear plate (2) has a fixing groove in the shape of half of the hydrophone olive area (301); the surface of the support rear plate (2) facing the support front plate (1) has a fixing groove in the shape of the other half of the hydrophone olive area (301).

5. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: A groove in the shape of an olive-shaped watertight layer (301) is formed on one side where the front plate (1) of the bracket and the rear plate (2) of the bracket contact each other, and the hydrophone (3) is fixed by clamping the olive-shaped watertight layer (301); at this time, the cylindrical sensitive layer (302) is not in contact with the hollow cylinder.

6. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: According to the towing direction, the bracket front plate (1) is in front of the bracket rear plate (2); the bracket front plate (1) and the bracket rear plate (2) are fixed by fasteners through bolt screw holes (102).

7. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: In the radial direction, a portion of the olive-shaped watertight layer (301) protrudes from the cylindrical sensitive layer (302).

8. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 1, characterized in that: The hollow cylinder is provided with a data line hole (101), a screw and bolt fixing hole (102), and a Kevlar rope fixing hole (103).

9. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 8, characterized in that: The data line holes (101) on the bracket front plate (1) and the bracket rear plate (2) are smooth cylindrical surfaces.

10. The fixing bracket for mounting a hydrophone using an olive-shaped structure according to claim 8, characterized in that: The Kevlar rope fixing holes (103) on the bracket front plate (1) and the bracket rear plate (2) are also provided with olive-shaped fixing grooves; the bracket front plate (1) and the bracket rear plate (2) are fixed on the Kevlar rope by tightly clamping the olive core in the Kevlar rope.

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