Underwater target reflector with adjustable target intensity and construction method thereof

Abstract

The invention belongs to the field of underwater acoustic engineering, and particularly relates to a target strength adjustable underwater target reflector and a construction method thereof.The target strength adjustable underwater target reflector comprises a pressure-resistant shell, a target adjusting layer, a lifting interface, a lifting interface and a counterweight cabin, the pressure-resistant shell is of a spherical shell structure, and the target adjusting layer is arranged on the outer surface of the pressure-resistant shell; a balance weight cabin is arranged in the center of the pressure-resistant shell, and an enclosure bulkhead of the pressure-resistant shell is arranged on the outer side of the balance weight cabin. According to the underwater target reflector acoustic target intensity adjusting device, the adjustment of the underwater target reflector acoustic target intensity is realized by replacing the acoustic material of the target adjusting layer or compounding the acoustic material with different acoustic characteristics in different directions or adjusting the water / gas proportion of the inner cavity; a large number of target reflectors do not need to be manufactured, the target strength of the target reflectors can be flexibly adjusted according to requirements to meet test simulation requirements, the test cost is reduced, and the test equipment storage space is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of underwater acoustic engineering, and particularly relates to a target intensity adjustable underwater target reflector and a construction method thereof. BACKGROUND

[0002] In many fields such as marine exploration and development, underwater security and defense, and military application, the detection and identification of underwater targets are crucial. The underwater target reflector is a key component for simulating the acoustic characteristics of real underwater targets, which is made of different shapes, materials, sizes, etc. and can produce specific reflected signals during sonar detection, thereby providing stable and repeatable target echo signal sources for the calibration and testing of sonar systems, and assisting the accurate evaluation of sonar equipment performance. With the help of underwater target reflectors with known characteristics, the detection technology can be calibrated in various simulated underwater environments, the functional indicators of the sonar system such as detection range, resolution, target recognition ability, etc. can be tested, the deviations caused by environmental factors can be corrected, the detection algorithm and equipment parameters can be optimized, and the reliability and stability of the detection system can be improved.

[0003] The underwater target reflector is mainly used for underwater target detection technology calibration, underwater acoustic environment simulation research, and development and testing of new sonar systems. The acoustic target intensity of the traditional underwater target reflector is fixed, which has obvious limitations in the face of complex and variable underwater detection and simulation tasks. That is, the existing underwater target reflector only represents a fixed target intensity value, and when different target intensity values need to be simulated during the test process, different target reflectors need to be replaced. For example, in the testing and training of underwater detection equipment, it is difficult to flexibly simulate the acoustic characteristics of different types of targets; in the field of marine scientific research, it is difficult to meet the requirements of accurately simulating the acoustic characteristics of various marine organisms or complex geological structures. SUMMARY

[0004] The present application aims to provide a target intensity adjustable underwater target reflector and a construction method thereof to solve the problems in the prior art.

[0005] The present application provides the following technical solutions: A target intensity adjustable underwater target reflector, comprising a pressure-resistant shell, a target adjustment layer, a lifting interface, a lifting interface, and a ballast tank, wherein the pressure-resistant shell is in a spherical shell structure, the target adjustment layer is arranged on the outer surface of the pressure-resistant shell, the ballast tank is arranged at the center of the pressure-resistant shell, the surrounding wall of the pressure-resistant shell is arranged outside the ballast tank, the surrounding wall is connected with the pressure-resistant shell, the surrounding wall and the pressure-resistant shell form a cavity structure body for storing gas in a sealed manner, the lifting interface and the lifting interface are respectively arranged on the upper and lower panels of the ballast tank, and a plurality of through holes are uniformly distributed on the upper and lower panels of the ballast tank.

[0006] Preferably, the pressure-resistant shell adopts a rigid pressure-bearing plate made of a corrosion-resistant metal material or a high-modulus high-strength corrosion-resistant composite resin material.

[0007] Preferably, one electromagnetic valve is arranged on each of the upper and lower surrounding walls of the pressure-resistant shell.

[0008] Preferably, the target adjustment layer is an acoustic passive material component layer with different impedance matching degrees.

[0009] Preferably, the target adjustment layer is made of a uniform layer material with different sound absorption / anti-sound performance or an impedance transition material with cavities / tooth shapes / localized oscillators.

[0010] Preferably, the target adjustment layer is made of a combination of acoustic passive material components with different working frequency bands and is distributed in different parts of the pressure-resistant shell.

[0011] A construction method of the underwater target reflector with adjustable target strength, comprising the following steps: When the pressure-resistant shell adopts a corrosion-resistant metal as the main material, the cut plate is cold-pressed / heat-pressed, bent or rolled into a spherical shell with a fixed diameter, and then welded into a pressure-resistant shell after the edge is closed. The target adjustment layer is pre-made and installed on the outer layer of the pressure-resistant shell, and different acoustic characteristic parameters and thicknesses of the target adjustment layer are replaced according to the test requirements to realize the target strength adjustment of the target reflector. Welding or assembling upper and lower panels near the port position between the surrounding walls of the pressure-resistant shell to form a weight compartment for placing the weight blocks, and the upper and lower panels are provided with through holes and are respectively welded with a lifting interface and a lifting interface to realize the underwater lifting and laying of the target reflector and the underwater depth and attitude adjustment.

[0012] Preferably, when the pressure-resistant shell adopts a high-modulus high-strength corrosion-resistant composite resin as the main material, the pressure-resistant shell with a fixed diameter is made by a molding process.

[0013] Preferably, the target adjustment layer with different acoustic characteristic parameters and thicknesses in different directions is arranged on the pressure-resistant shell to realize different acoustic target strengths of the target reflector in different directions or attitudes.

[0014] Preferably, the electromagnetic valve is controlled to adjust the water / gas ratio in the cavity structure to realize the adjustment of the omnidirectional acoustic target strength of the target reflector.

[0015] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects: The application can realize the adjustment of the underwater target reflector acoustic target intensity in a super large range by replacing the target adjustment layer acoustic material or using acoustic materials with different composite acoustic characteristics in different directions or adjusting the internal cavity water / gas ratio, or using the above adjustment methods in combination, so as to simulate different test targets in a super large target intensity range; when the underwater detection technology calibration, environment simulation and equipment development test are carried out, a large number of target reflectors do not need to be made, the target intensity of the target reflector can be flexibly adjusted according to the needs to match the test simulation needs, and the test cost is reduced and the test equipment storage space is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a specific structure diagram of the underwater target reflector with adjustable target intensity.

[0017] The figure is marked as follows: 1-lifting interface; 2-lifting interface; 3-ballast tank; 4-pressure hull; 5-target adjustment layer; 6-solenoid valve. DETAILED DESCRIPTION

[0018] The specific embodiments of the application are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice the application. Although the application is described in combination with its preferred specific embodiments, these embodiments are only illustrative, not limiting the scope of the application.

[0019] An underwater target reflector with adjustable target intensity, comprising a pressure hull 4, a target adjustment layer 5, a lifting interface 1, a lifting interface 2 and a ballast tank 3, the pressure hull 4 is in a spherical shell structure, the outer surface of the pressure hull 4 is provided with the target adjustment layer 5, the center of the pressure hull 4 is provided with the ballast tank 3, the ballast tank 3 is used for installing a ballast module, so as to adjust the weight of the target reflector in water, the outer side of the ballast tank 3 is provided with a surrounding wall of the pressure hull 4, the surrounding wall is connected with the pressure hull 4, and the surrounding wall and the pressure hull 4 form a cavity structure body for storing gas in a closed manner, the upper and lower panels of the ballast tank 3 are respectively provided with the lifting interface 1 and the lifting interface 2, the lifting interfaces are used for connecting test cables, realizing the adjustment of the underwater depth and posture of the target reflector, and the upper and lower panels of the ballast tank 3 are uniformly distributed with a plurality of through holes, realizing the flow of water in the ballast tank 3 and reducing the buoyancy of the target body in water.

[0020] Specifically, the pressure hull 4 is made of rigid pressure-bearing plate material, which is made of corrosion-resistant metal material or high-modulus high-strength corrosion-resistant composite resin material, so as to improve the service life of the pressure hull 4.

[0021] Specifically, one solenoid valve 6 is arranged on the upper and lower surrounding walls of the pressure hull 4, and the solenoid valve 6 is used for adjusting the water / gas ratio of the internal cavity structure.

[0022] Specifically, the target adjustment layer 5 is a replaceable acoustic passive material component layer with different impedance matching degrees, so as to simulate different target intensity values subsequently.

[0023] Specifically, the target adjustment layer 5 is made of uniform layer materials with different sound absorption / anti-sound performance or impedance transition materials with cavities / tooth shapes / localized oscillators, so as to meet the use in deep water pressure environment.

[0024] Specifically, the target adjustment layer 5 is made of acoustic passive material components with different working frequency bands, and is distributed in different parts of the pressure-resistant shell.

[0025] A construction method of the underwater target reflector with adjustable target intensity includes the following steps: When the pressure-resistant shell 4 is mainly made of corrosion-resistant metal, the cut plate is cold-pressed / heat-pressed, bent or rolled into a spherical shell with a certain diameter, and is welded into the pressure-resistant shell 4 after the edge is closed. The target adjustment layer 5 is pre-formed and installed on the outer layer of the pressure-resistant shell 4, and different acoustic characteristic parameters and thicknesses of the target adjustment layer 5 are replaced according to test requirements, so as to realize the target intensity adjustment of the target reflector. The upper and lower panels are welded or assembled between the surrounding walls of the pressure-resistant shell 4 near the port position, forming the weight compartment 3 for placing the weight blocks, and the through holes are formed on the upper and lower panels, and the lifting interfaces 1 and 2 are welded on the upper and lower panels respectively, so as to realize the underwater lifting and laying of the target reflector and the underwater depth and attitude adjustment.

[0026] Specifically, when the pressure-resistant shell 4 is mainly made of high-modulus and high-strength corrosion-resistant composite resin, the pressure-resistant shell 4 with a certain diameter is made by molding process, which also has good corrosion resistance.

[0027] Specifically, the target adjustment layer 5 with different acoustic characteristic parameters and thicknesses in different directions is arranged on the pressure-resistant shell 4, so that the target reflector has different acoustic target intensities in different directions or attitudes, and the target reflector has different acoustic target intensities in different directions or attitudes, and different test targets are simulated by adjusting the underwater attitude and wave-encountering angle of the target reflector.

[0028] Specifically, the electromagnetic valve 6 is controlled to adjust the water / gas ratio in the cavity structure, so as to adjust the omnidirectional acoustic target intensity of the target reflector.

[0029] In addition, the present application can realize the adjustment of the sound target intensity of the target reflector by replacing the acoustic material of the target adjustment layer 5 of the target reflector, or by compounding acoustic materials with different acoustic characteristics in different directions, or by adjusting the water / gas ratio in the cavity structure. The above three methods can be used alone or in combination to adjust the sound target intensity of the target reflector, so as to simulate different test targets in a super-large target intensity range. The sound target intensity of the target reflector can be adjusted in a super-large range, so that a large number of target reflectors do not need to be made during underwater detection technology calibration, environment simulation, and equipment development and testing. The target intensity of the target reflector can be flexibly adjusted according to the needs to match the test simulation needs, which can reduce the test cost and make the test process more efficient and flexible.

[0030] The above only describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any modification and replacement based on the technical solutions and inventive concepts provided by the present application should be covered within the protection scope of the present application.

Claims

1. An underwater target reflector with adjustable target strength, characterized by: The utility model relates to a target reflector, including pressure -resistant casing (4), target regulation layer (5), hang and put interface (1), hang and put interface (2) and counterweight cabin (3), the pressure -resistant casing (4) is spherical shell structure, and the pressure -resistant casing (4) outer surface is provided with target regulation layer (5), and the pressure -resistant casing (4) center is provided with counterweight cabin (3), and the counterweight cabin (3) outside is provided with the surrounding wall of pressure -resistant casing (4), the surrounding wall is connected with the pressure -resistant casing (4), and the surrounding wall and the pressure -resistant casing (4) form the cavity structure of internal airtight gas storage, and the counterweight cabin (3) upper and lower panels are respectively installed with hang and put interface (1) with hang and put interface (2), and the counterweight cabin (3) upper and lower panels are evenly distributed with multiple through -holes.

2. The adjustable-strength underwater target reflector of claim 1, wherein: The pressure -resistant casing (4) adopts rigid pressure -bearing plate material, which is made of corrosion -resistant metal material or high modulus high strength corrosion -resistant composite resin material.

3. The adjustable-strength underwater target reflector of claim 1, wherein: The surrounding wall of the pressure -resistant casing (4) is provided with an electromagnetic valve (6) on the upper and lower sides.

4. The adjustable-strength underwater target reflector of claim 1, wherein: The target regulation layer (5) is an acoustic passive material component layer with different impedance matching degrees.

5. The adjustable-strength underwater target reflector of claim 4, wherein: The target regulation layer (5) is made of uniform layer material with different sound absorption / anti-sound performance or impedance transition material with cavities / tooth shapes / localized oscillators.

6. The adjustable-strength underwater target reflector of claim 4, wherein: The target regulation layer (5) is made of acoustic passive material components with different working frequency bands and is distributed in different parts of the pressure -resistant casing.

7. A method for constructing a target strength adjustable underwater target reflector according to any one of claims 1-6, characterized in that: The method comprises the following steps: When the pressure -resistant casing (4) adopts corrosion -resistant metal as the main material, the cut plate is bent or rolled into a spherical shell shape with a fixed diameter by cold pressing / heat pressing, and is welded into the pressure -resistant casing (4) after edge sealing; The target regulation layer (5) is pre-formed and installed on the outer layer of the pressure -resistant casing (4), and different acoustic characteristic parameters and thicknesses of the target regulation layer (5) are replaced according to test requirements to realize target strength adjustment of the target reflector; The upper and lower panels are welded or assembled between the surrounding walls of the pressure -resistant casing (4) near the port position to form the counterweight cabin (3) for placing the counterweight blocks, through -holes are formed in the upper and lower panels, and the upper and lower panels are respectively welded with the hang and put interface (1) and the hang and put interface (2) to realize underwater hoisting and laying of the target reflector and underwater depth and attitude adjustment.

8. The method of claim 7, wherein: When the pressure -resistant casing (4) adopts high modulus high strength corrosion -resistant composite resin as the main material, the pressure -resistant casing (4) with a fixed diameter is made by molding process.

9. The method of claim 7, wherein: Different target regulation layers (5) with different acoustic characteristic parameters and thicknesses in different directions are arranged on the pressure -resistant casing (4) to realize different acoustic target strengths of the target reflector in different directions or attitudes.

10. The method of claim 7, wherein: The control adjustment electromagnetic valve (6) is used to adjust the water / gas ratio in the cavity structure to realize adjustment of the omnidirectional acoustic target strength of the target reflector.

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