Mounting fixture for hydrophone using an olive structure

Abstract

The application provides a fixing support for installing a hydrophone by using an olive-shaped structure, precise positioning and fixing of the hydrophone are realized by embedding and fixing the olive-nucleus-shaped polyurethane watertight layer through the left and right fixing supports; the left and right supports are designed as two pieces with different thicknesses, the protruding olive nucleus is designed at the edge of the hydrophone, and the most sensitive cylindrical surface of the hydrophone is maximally avoided from the interference of fixed connection. Compared with the scheme of the traditional hydrophone fixing support, the application realizes low interference and high modification ability of the outer support shell layer to the sensitive surface at the same time without changing the installation difficulty of the hydrophone.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of underwater acoustic sensor, and particularly relates to a fixing support for installing hydrophone with olive-shaped structure. In particular, it is a fixing support for installing hydrophone of towed array with offset olive core structure. BACKGROUND

[0002] In the applications of marine exploration, environmental monitoring and military reconnaissance, hydrophone as an important sensing device is widely used for receiving and analyzing acoustic waves.

[0003] Towed array sonar is an array hydrophone system arranged by towing, which can provide high spatial resolution acoustic data and is effectively used for underwater acoustic detection. At present, the hydrophone in the towed array is usually installed in the form of a fixing support, which has the characteristics of fixing the relative axial and radial positions of the hydrophone in the towed array, forming a detection array that meets the 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 to some extent suppress the towed noise and is conducive to underwater target detection; in addition, it has the protection effect on the hydrophone to avoid damage caused by external force. For example, patent document CN101598594A discloses a protection support for optical fiber hydrophone towed array, which comprises: a main support for supporting and connecting a first bracket and a second bracket at both ends thereof; the first bracket and the second bracket are located at both ends of the main support and are used for fixing the hydrophone and supporting the external protective sleeve in the towed array; and a hole is formed on the main support for sound field coupling.

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

[0005] However, with the requirement of thinning the towed array, the original noise suppression design cannot meet the requirements of the towed array sonar; one of them is that with the thinning of the towed array, the diameter of the hydrophone support is also reduced, at this time the shell layer between the sensitive surface of the hydrophone and the outer surface of the support is also getting thinner. The fixing support can be regarded as a whole vibration in the original design, at this time the vibration interference of the shell layer outside the sensitive surface needs to be considered independently. Therefore, how to obtain a fixing support with lower interference needs further design of the shell layer outside the sensitive surface. The original design scheme of fixingly connecting the polyurethane water-tight layer with the fixing support at the center position greatly limits the space for further design of the shell layer outside the sensitive surface. SUMMARY

[0006] In view of the defects in the prior art, the present application aims to provide a fixing bracket for mounting a hydrophone by using an olive-shaped structure.

[0007] According to the present application, a fixing bracket for mounting a hydrophone by using an olive-shaped structure is provided, comprising: a bracket front plate 1, a bracket rear plate 2, and a polyurethane water-tight layer.

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

[0009] The bracket front plate 1 and the bracket rear plate 2 are assembled to form a hollow cylinder, which can embed the hydrophone 3 wrapped by the polyurethane water-tight layer.

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

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

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

[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 is provided with a fixing groove in the shape of half of the olive area 301 of the hydrophone on the side in contact with the bracket rear plate 2; and 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 olive area 301 of the hydrophone.

[0014] Preferably, the bracket front plate 1 and the bracket rear plate 2 are provided with a groove in the shape of the olive-shaped water-tight layer 301 on the side in contact with each other, so as to fix the hydrophone 3 by clamping the olive-shaped water-tight layer 301; and at this time, the cylindrical sensitive layer 302 does not contact the hollow cylinder.

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

[0016] Preferably, in the radial direction, part of the olive-shaped water-tight layer 301 protrudes from the cylindrical sensitive layer 302.

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

[0018] Preferably, the data line hole 101 on the bracket front plate 1 and the bracket rear plate 2 is a smooth cylindrical surface.

[0019] Preferably, 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 nucleus in the Kevlar rope.

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

[0021] 1. The present application realizes low interference and high stability at the same time without changing the difficulty of installing the hydrophone, thereby improving the detection capability of the towed array hydrophone.

[0022] 2. The present application can reduce direct contact with the hydrophone and avoid interfering with the receiving space pressure change of the hydrophone.

[0023] 3. In the present application, the outer fixed bracket shell layer of the hydrophone coating layer is a complete independent cylinder, which is convenient for secondary modification, such as radial hole.

[0024] 4. The parts of the present application are easy to disassemble and maintain. BRIEF DESCRIPTION OF DRAWINGS

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

[0026] Figure 1 is a three-dimensional schematic diagram of the whole structure of the bias olive nucleus fixing bracket of the embodiment of the present application;

[0027] Figure 2 is a two-dimensional cross-sectional schematic diagram of the bias olive nucleus fixing bracket of the embodiment of the present application;

[0028] Figure 3 is a hydrophone sound pressure sensitivity (dB) simulation diagram of the embodiment of the present application, in which the horizontal coordinate represents the working frequency band, and the vertical coordinate represents the sound pressure sensitivity;

[0029] The figure shows:

[0030] DETAILED DESCRIPTION

[0031] The present application will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These all belong to the protection scope of the present application.

[0032] The application provides a fixing support for fixing a towed array hydrophone by using an offset olive core structure, and realizes accurate positioning and fixing of the hydrophone by embedding a polyurethane watertight layer in the shape of an olive core through left and right fixing supports; the left and right supports are designed as two pieces with 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 is maximally avoided from the interference of fixed connection. Compared with the traditional fixing support scheme of the hydrophone, the application realizes low interference and high modification ability of the outer support shell layer of the sensitive surface at the same time without changing the installation difficulty of the hydrophone. The offset refers to that the position of the fixed hydrophone is arranged at the center of the support in the traditional scheme, and the offset is arranged at the head of the hydrophone (cylindrical pipe) in the embodiment of the application; because the hydrophone is still arranged at the center of the support, the structure for fixing, i.e., the olive core, is offset.

[0033] Figure 1 It is a three-dimensional schematic view of the whole structure of the offset olive core fixing support of the embodiment of the application, and provides a space for further design of the outer support shell layer of the sensitive surface. Figure 1 As shown in the embodiment of the application, the fixing support for installing the hydrophone by using an olive shape structure comprises a support front plate 1, a support rear plate 2 and a polyurethane watertight layer of a hydrophone 3; the support front plate 1 is thinner than the support rear plate 2; the support front plate 1 and the support 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 arcs. The profile section of the olive core is in the shape of an olive.

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

[0035] The support rear plate 2 is mirror-symmetrical with the support front plate 1 in other structures except for the thickness; according to the dragging direction, the support front plate 1 is in front of the support rear plate 2; the support front plate 1 and the support rear plate 2 are fixed by using fasteners through bolt screw holes 102; the hydrophone 3 is cylindrical, the surface is wrapped with a water-tight layer, the material is polyurethane, the top surface of the hydrophone 3 is poured into a radially opposite convex olive-shaped water-tight layer 301, forming an olive-shaped area, and the cylindrical sensitive layer 302 forms a standard cylindrical surface; the support rear plate 2 completely covers the cylindrical sensitive layer 302 in the radial direction, and the support rear plate 2 is modified, for example, radial punching, so as to realize the design modification of the sensitive surface outer support shell. Specifically, the support front plate 1 is axially opened data line holes 101, screw bolt fixing holes 102 and Kevlar rope fixing holes 103; the polyurethane water-tight layer of the hydrophone 3 includes the olive-shaped water-tight layer 301 and the cylindrical sensitive layer 302 covering the entire hydrophone cylindrical surface. The support front plate 1 is a hollow cylindrical structure, the radial outer surface thereof is a standard cylindrical surface, and the inner surface thereof is in contact with the support rear plate 2 on one side and is opened with a fixing groove in the shape of half of the hydrophone olive area 301; the surface of the support rear plate 2 towards the support front plate 1 is opened with a fixing groove in the shape of the other half of the hydrophone olive area 301.

[0036] Figure 2 Figure 1 is a two-dimensional cross-sectional view of a bias olive kernel fixing support according to an embodiment of the present application. Figure 2 As shown in the embodiment of figure 1, the support front plate 1 and the support rear plate 2 are opened with olive-shaped water-tight layer 301-shaped grooves on the side in contact with each other, and the hydrophone 3 is fixed by clamping the olive-shaped water-tight layer 301; at this time, the cylindrical sensitive layer 302 is not in contact with the hollow cylinder.

[0037] The support front plate 1 and the support rear plate 2 are fixed on the braided rope passing through the support by using the same olive-shaped groove, the braided rope is made of Kevlar, and the positioning member made of aluminum alloy is embedded in the braided rope to position the support; the hydrophone 3 is connected with the cable in a water-tight manner; the bias olive kernel fixing support according to the embodiment of the present application is assembled.

[0038] Figure 3 Figure 2 is a hydrophone sound pressure sensitivity (dB) simulation diagram of the bias olive kernel fixing support according to an embodiment of the present application, and the working frequency band is in a low frequency band of 100-2000 Hz, as shown in the embodiment of figure 2, when the fixed hydrophone 3 is working, the cylindrical sensitive layer 302 keeps a state of not being in contact with the support front plate 1 and the support rear plate 2, and compared with the center fixing mode, the fixed hydrophone 3 has higher receiving sensitivity in the low frequency band. Specifically, for the circular tube hydrophone fixed by the support, if the structure used for fixing, that is, the olive kernel, is in the middle section, the structure will exert a certain prestress on the most sensitive cylindrical surface in the middle section of the hydrophone, so as to slightly affect the sensitivity of the hydrophone; in the present application, the olive kernel is offset to the head of the hydrophone circular tube, and does not affect the middle section of the cylindrical surface.

[0039] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which do not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict, provided that they do not conflict.

Claims

1. A mounting bracket for a hydrophone using an olive-shaped structure, characterized in that, It comprises: A bracket front plate (1), a bracket back plate (2), and a polyurethane water-tight layer; The polyurethane water-tight layer comprises an olive-shaped water-tight layer (301) and a cylindrical sensitive layer (302) covering the entire cylindrical surface of the hydrophone (3); The bracket front plate (1) and the bracket back plate (2) are assembled to form a hollow cylinder, which can embed the hydrophone (3) wrapped with the polyurethane water-tight layer; The bracket front plate (1) and the bracket back plate (2) hold the olive-shaped water-tight layer (301) to fix the hydrophone (3); The bracket front plate (1) is thinner than the bracket back plate (2); except for the difference in thickness, the bracket back plate (2) is mirror-symmetrical to the bracket front plate (1) in other structures; The bracket back plate (2) completely covers the radial direction of the cylindrical sensitive layer (302), and the bracket back plate (2) provides the design modification of the sensitive surface outer support shell; The bracket front plate (1) is a hollow cylindrical structure, the radial outer surface is a standard cylindrical surface, and the inner surface is provided with a fixing groove in the shape of half of the olive area of the hydrophone on the side in contact with the bracket back plate (2); the surface of the bracket back plate (2) facing the bracket front plate (1) is provided with a fixing groove in the shape of the other half of the olive area of the hydrophone; The bracket front plate (1) and the bracket back plate (2) are provided with a groove in the shape of the olive-shaped water-tight layer (301) on the side in contact with each other, and the hydrophone (3) is fixed by clamping the olive-shaped water-tight layer (301); at this time, the cylindrical sensitive layer (302) is not in contact with the hollow cylinder.

2. The fixed mount for hydrophone using an olive structure according to claim 1, wherein According to the direction of the tow, the bracket front plate (1) is in front of the bracket back plate (2); the bracket front plate (1) and the bracket back plate (2) are fixed by using fasteners through screw bolt fixing holes (102).

3. The mounting fixture for hydrophone using an olive structure according to claim 1, wherein In the radial direction, part of the olive-shaped water-tight layer (301) protrudes from the cylindrical sensitive layer (302).

4. The mounting fixture for hydrophone using an olive structure according to claim 1, wherein The hollow cylinder is provided with a data line hole (101), a screw bolt fixing hole (102), and a Kevlar rope fixing hole (103).

5. The fixed mount for hydrophone using an olive structure according to claim 4, wherein The data line hole (101) on the bracket front plate (1) and the bracket back plate (2) is a smooth cylindrical surface.

6. The fixed mount for hydrophone using an olive structure according to claim 4, wherein The Kevlar rope fixing hole (103) on the bracket front plate (1) and the bracket back plate (2) is also provided with an olive-shaped fixing groove; the bracket front plate (1) and the bracket back plate (2) are fixed on the Kevlar rope by tightly clamping the olive core in the Kevlar rope.

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