A bionic device for regulating beam width and implementation method

Abstract

The application relates to a biomimetic device for regulating beam width and an implementation method, which comprises a metal shell for simulating the head skeleton of a dolphin, forming a cylindrical shape through rotation, and canceling the air cavity corresponding to the air bag structure of the head of the dolphin, and only reflecting sound waves through the boundary of the metal material and water, and the end surface of the small opening of the metal shell is uniformly distributed with mounting holes along the axis for connecting with a fixed ring. The application simulates the biological structure of the dolphin, plays a role in regulating the beam width of the underwater acoustic transducer, makes the sound energy of the transducer concentrated on the main shaft, improves the sound energy of the main shaft, reduces the influence of interface reflection, and is favorable for improving the detection distance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transducer, in particular to a bionic device for regulating beam width and a method for implementing the same. BACKGROUND

[0002] Sonar plays an extremely important role in ocean exploration and has wide application requirements in underwater confrontation, ocean scientific investigation, resource exploration and development, and seabed observation. Current artificial active sonar still cannot be compared with dolphin sonar in terms of beam directivity control, anti-interference, and intelligent detection. Based on the dolphin sound modulation structure, a bionic structure can be designed to regulate the beam width and directivity of an artificial sound source. The current method is to simulate the forehead structure of the dolphin sound velocity gradient change through a variable-diameter metal column array, simulate the dolphin head skeleton through a metal plate, and simulate the air cavity through an air cavity. There is a certain angle between the metal plate and the air cavity, the metal column array is regularly arranged between them, and as the distance between them increases, the diameter of the metal column decreases. The bionic device is a planar structure with a certain thickness. The sound source is located on the side with a smaller distance between the metal plate and the air cavity and emits sound to the area between them.

[0003] Due to the large number of regularly arranged metal columns in the bionic device, the small volume, and the large number of grids caused by the large number of metal columns in the finite element modeling research, the calculation resources have a high requirement. At the same time, the complex structure also makes it difficult to realize the bionic device. Currently, the metal column is two-dimensionally distributed, and after the subsequent improvement to a three-dimensional structure, the modeling analysis and implementation of the bionic device will be doubled. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a bionic device for regulating beam width and a method for implementing the same, which simulates the biological structure of a dolphin to regulate the beam width of an underwater acoustic transducer, concentrates acoustic energy on the main axis of the transducer, improves the main axis acoustic energy, reduces the influence of interface reflection, and thus helps to improve the detection distance.

[0005] The technical solution of the present application is to provide a bionic device for regulating beam width, which comprises,

[0006] A metal shell is used to simulate the head skeleton of a dolphin and forms a cylindrical shape through rotation, and the air cavity corresponding to the dolphin head airbag structure is cancelled, and only the boundary between the metal material and water is used to reflect sound waves, thereby simplifying the structure of the bionic device. The end surface of the small opening of the metal shell is uniformly distributed with mounting holes along the axis for connecting with a fixed ring;

[0007] A low sound velocity block which is conical in shape, made of silica gel material, the center of the cone coincides with the center of the metal shell, the bottom of the cone is directed outward from the opening of the metal shell to radiate sound waves;

[0008] A support for fixing the low sound velocity block in the center of the metal shell;

[0009] A transducer which is a transmitting transducer, can emit sound waves in a certain axial direction;

[0010] A fixed ring which is divided into two halves, the cross section is L-shaped, a through hole is arranged on the bottom step, the fixed ring and the transducer can be connected with the metal shell through fasteners and mounting holes on the metal shell;

[0011] A vibration isolation pad which is a circular decoupling vibration isolation material, has a hole matched with the mounting hole on the metal shell to avoid direct contact between the metal shell and the fixed ring, and ensure the free boundary condition of the opening of the metal shell.

[0012] The present application mainly simulates the biological structure of dolphins to control the beam width of the underwater acoustic transducer, so that the sound energy of the transducer is concentrated on the main shaft. According to the structure of the dolphin frontal boss with low sound velocity in the middle and high sound velocity on the periphery, the present application proposes a suspended conical low sound velocity block biomimetic structure, which simplifies the structure of the sound velocity gradient in the dolphin frontal boss to a water-silica gel two-phase structure, and completes the control of the beam width of the transducer. At the same time, the low sound velocity block is fixed in a suspended structure, which simplifies the installation of the low sound velocity block, and there is no need to design the structure cooperation of the low sound velocity block, the metal shell and the radiation surface of the transducer.

[0013] As a preferred, the support is a cross structure.

[0014] As a preferred, the support is a three-prong or five-prong structure uniformly arranged along the circumference of the metal shell, or the support is flush with the port of the metal shell and connected, and a cylinder is further protruded from the center of the support along the axis of the metal shell and embedded in the low sound velocity block. The main function is to fix the position of the low sound velocity block.

[0015] As a preferred, the material of the low sound velocity block can be replaced by a soft material with sound impedance close to water and sound velocity lower than water. When the low sound velocity block is a soft material, a support rod can be embedded in the center to maintain the conical structure and avoid deformation of the low sound velocity block due to gravity or water flow.

[0016] The present application also provides an implementation method of the above-mentioned biomimetic device for controlling the beam width, comprising the following steps,

[0017] The support is placed in the perfusion mold of the low sound velocity block, the support is close to the bottom end of the conical low sound velocity block, the silica gel liquid is perfused, and the mold is removed after solidification;

[0018] Put the support and low speed block into the metal shell, the support is in contact with the inner wall of the metal shell, the low speed block is kept coincident with the center of the metal shell, and the support and the inner wall of the metal shell are bonded by using water-insoluble glue;

[0019] Two fixed rings are clamped on the surface of the transducer, the fixed ring and the vibration isolation pad are fixed on the metal shell through bolts, and the sound radiation direction of the transducer is ensured to be directed to the inside of the metal shell.

[0020] Compared with the prior art, the above scheme has the following advantages:

[0021] The bionic device of the embodiment of the present application is shown in the structure diagram. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The bionic device structure diagram of the embodiment of the present application is shown in the structure diagram.

[0023] Figure 2 The structure diagram of the low speed block and the support of the embodiment of the present application is shown in the structure diagram.

[0024] Figure 3 The simulation diagram of the low speed block of the embodiment of the present application for improving the response of the bionic device to the voltage is shown in the simulation diagram.

[0025] Figure 4 The simulation diagram of the low speed block of the embodiment of the present application for improving the directivity of the bionic device is shown in the simulation diagram. DETAILED DESCRIPTION

[0026] The present application will be further described in combination with the specific embodiments and the accompanying drawings:

[0027] A bionic device for regulating beam width, as shown in Figure 1 , 2 , the bionic device comprises a metal shell 1, a low speed block 2, a support 3, a fixed ring 4, a vibration isolation pad 5 and a transducer 6.

[0028] The metal shell 1 is used to simulate the head skeleton of a dolphin, and is formed into a cylindrical shape by rotation. The metal shell cancels the air cavity corresponding to the air bag structure of the head of the dolphin, and only reflects the sound wave through the boundary of the metal material and water, thereby simplifying the structure of the bionic device. Four screw holes are uniformly distributed on the end face of the small opening of the metal shell 1 along the axis.

[0029] The low speed block 2 is conical, is made of silica gel material to form a silica gel block, the center of the cone is coincident with the center of the metal shell 1, and the bottom of the cone is directed to the opening of the metal shell 1 for radiating sound waves outward.

[0030] The support 3 has a cross-shaped structure. The silicone near the bottom of the low-velocity block 2 is thick and heavy. During the pouring of the low-velocity block 2, the support 3 is embedded in the bottom of the low-velocity block 2, and the silicone cures to fix the support 3 to the low-velocity block 2. This is used to fix the low-velocity block 2 to the center of the metal casing 1.

[0031] Transducer 6 is a transmitting transducer that can emit sound waves in a constant axial direction.

[0032] The fixed ring 4 is divided into two halves with an L-shaped cross-section. There is a through hole on the bottom step, which can be used to connect the fixed ring 4 and the transducer 6 to the metal housing 1 through bolts and screw holes on the metal housing 1.

[0033] The vibration isolation pad 5 is a ring-shaped decoupling vibration isolation material with holes on its surface that match the screw holes on the metal housing 1. This prevents the metal housing 1 from directly contacting the fixed ring 4 and ensures the free boundary conditions at the opening of the metal housing 1.

[0034] The biomimetic device in this embodiment can be implemented in the following way:

[0035] Place the support 3 into the injection mold of the low-velocity block 2, with the support 3 close to the bottom of the cone-shaped low-velocity block 2. Pour in liquid silicone, and remove the mold after it has cured.

[0036] Place the bracket 3 and the low-velocity block 2 into the metal housing 1. The bracket 3 contacts the inner wall of the metal housing 1, and the center of the low-velocity block 2 is kept coincident with the center of the metal housing 1. Use water-insoluble glue to bond the bracket 3 to the inner wall of the metal housing 1.

[0037] The two fixing rings 4 are clamped onto the surface of the transducer 6, and the fixing rings 4 and vibration isolation pads 5 are fixed to the metal housing 1 with bolts. This ensures that the sound radiation direction of the transducer 6 is towards the inside of the metal housing 1.

[0038] Simulation results of the voltage response and directivity of the biomimetic device with and without the conical silicone block are as follows: Figure 3 and Figure 4 As shown, the conical silicone block can improve the voltage response of the bionic device and reduce the beamwidth of the bionic device.

[0039] This invention uses a biomimetic device composed of a metal shell, water, and low-velocity sound blocks to modulate the sound field of a transducer, thereby reducing the transducer beamwidth and increasing the acoustic energy of the transducer's main shaft. This invention has a simple structure, is easy to implement, and is highly feasible.

[0040] It should be noted that the support structure can be other types, such as three-pronged or five-pronged brackets evenly arranged along the circumference of the metal shell, or the support can be flush with and connected to the port of the metal shell, with a cylinder extending from the center of the support along the axis of the metal shell and embedded in the low-sound block, forming a vertical structure similar to the support. The low-sound block can also be made of other materials, characterized by being relatively soft, having an acoustic impedance similar to water, and a sound velocity lower than water. When the low-sound block is made of a relatively soft material, a support rod can be embedded in its center to maintain its conical structure and prevent deformation due to gravity or water flow.

[0041] The fixing ring and vibration isolation pad of this invention can be other structures, such as the transducer being directly connected to the test rod via a clamp, instead of being directly fixed to the biomimetic structure. For example, the transducer can be connected to the metal shell via a rubber tube and glue.

[0042] Similarly, the biomimetic device of the present invention can also perform beam control on commonly used underwater acoustic transducers such as curved disk transducers and circular tube transducers.

[0043] The above description only illustrates preferred embodiments of the present invention and should not be construed as limiting the scope of the claims. Any equivalent structural or procedural modifications made using this specification are included within the patent protection scope of the present invention.

Claims

1. A biomimetic device for controlling beamwidth, characterized in that: Bionic devices include, The metal shell is used to simulate the skull of a dolphin and is formed into a cylindrical shape by rotation. The air cavity corresponding to the air sac structure of the dolphin's head is eliminated. Sound waves are reflected only through the boundary between the metal material and the water. Mounting holes are distributed along the axis on the end face of the small opening of the metal shell for connection with the fixing ring. The low-velocity block is cone-shaped and made of silicone material. The center of the cone coincides with the center of the metal shell, and the bottom of the cone faces the opening of the metal shell that radiates sound waves outward. A bracket is used to secure the low-speed sound block to the center of the metal casing; A transducer, specifically a transmitting transducer, can emit sound waves in a constant axial direction. The fixed ring is divided into two halves with an L-shaped cross-section. A through hole is provided on the bottom step, which can be used to connect the fixed ring and the transducer to the metal housing through the mounting holes on the metal housing with fasteners. The vibration isolation pad is a ring-shaped decoupling vibration isolation material with holes on its surface that match the mounting holes on the metal housing to avoid direct contact between the metal housing and the fixed ring, thus ensuring free boundary conditions at the opening of the metal housing.

2. The biomimetic device for controlling beamwidth according to claim 1, characterized in that: Mounting holes are evenly distributed along the axis.

3. The biomimetic device for controlling beamwidth according to claim 1, characterized in that: The support structure is a cross-shaped structure.

4. The biomimetic device for controlling beamwidth according to claim 1, characterized in that: The support is a three- or five-claw structure evenly arranged along the circumference of the metal shell, or the support is flush with and connected to the port of the metal shell, and a cylinder extends from the center of the support along the axis of the metal shell and is embedded in the low-sound block.

5. The biomimetic device for adjusting beamwidth according to claim 1, characterized in that: The material of the low-velocity block can be replaced with a soft material whose acoustic impedance is close to that of water and whose sound velocity is lower than that of water. When the low-velocity block is made of soft material, a support rod can be embedded in its center to maintain its conical structure and prevent the low-velocity block from deforming due to gravity or water flow.

6. The method for implementing the biomimetic device for controlling beamwidth according to any one of claims 1-5, characterized in that: Includes the following steps, Place the support into the injection mold of the low-velocity block, with the support close to the bottom of the cone of the low-velocity block, and pour in the silicone liquid. Remove the mold after it has cured. Place the bracket and the low-velocity block into the metal housing, with the bracket in contact with the inner wall of the metal housing, ensuring that the center of the low-velocity block coincides with the center of the metal housing, and use glue to bond the bracket to the inner wall of the metal housing. The two fixing rings are clamped onto the transducer surface, and the fixing rings and vibration isolation pads are fixed to the metal shell with bolts to ensure that the sound radiation direction of the transducer is towards the inside of the metal shell.

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