An airgun for underwater generation of insonification

Abstract

This invention relates to the field of underwater acoustic equipment technology, and discloses an aerodynamic source for underwater infrasound generation. It includes multiple aerodynamic source units, some of which are main aerodynamic sources, and the remainder are auxiliary aerodynamic sources. The number of auxiliary aerodynamic sources is no less than that of the main aerodynamic sources. An array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source. The emission ports of the multiple aerodynamic source units all face the same direction. Each aerodynamic source unit includes a unidirectionally connected operating chamber and a emission chamber. The air inlet of the operating chamber is connected to an external air source to introduce inert gas into the operating chamber. The emission port is located at the end of the emission chamber furthest from the operating chamber. This invention allows for individual adjustment of the emission time of each emission chamber, broadening the infrasound frequency range and increasing the infrasound intensity, enabling the generation of broadband infrasound signals with an intensity exceeding 200 dB in underwater environments.

Description

Technical Field

[0001] This invention relates to the field of underwater acoustic equipment technology, and in particular to an aerodynamic vibration source for underwater subsonic generation. Background Technology

[0002] Infrasound refers to sound waves with frequencies below 20 Hz. It can travel extremely long distances in seawater with minimal attenuation. Due to its unique physical properties, infrasound has always been a focus of research for many scientists.

[0003] In the field of underwater acoustics, underwater seismic source technology is one of the key technologies for underwater detection and communication. Current underwater infrasound sources are insufficient to meet these multi-dimensional application requirements. Traditional electric infrasound generators face numerous technical bottlenecks when applied underwater. The underwater environment places extremely high demands on the waterproof and pressure-resistant performance of electric equipment; complex sealing and pressure-resistant structures increase the size and weight of the equipment, hindering flexible deployment and long-term stable operation underwater. Simultaneously, the energy conversion efficiency of electric generators is limited by the physical process of converting electrical energy into mechanical energy, making it difficult to achieve efficient infrasound energy output, especially when high-energy infrasound signals (such as above 200 dB) are required. Moreover, the infrasound frequency range they generate is relatively narrow, failing to meet the needs of broadband detection and research, thus limiting the comprehensive analysis of ocean phenomena at different scales.

[0004] While pneumatic vibration sources, as another type of infrasound generation method, have some potential, current technologies still have significant shortcomings. Most pneumatic vibration sources lack flexibility in infrasound frequency control, often relying on simple air circuit structures and mechanical devices, and cannot achieve wide-band coverage of infrasound frequencies. For example, a common single-chamber pneumatic vibration source, such as an air gun, mainly consists of an air chamber, a shuttle, and a firing valve. The air chamber stores high-pressure air, and the shuttle controls the release of air. When the air gun is triggered, the firing valve opens, and the high-pressure air is rapidly released into the water through the shuttle. The shuttle moves rapidly under the action of the high-pressure air, forming a high-pressure shock wave. This impact induces cavitation, thereby generating infrasound. This structure can only generate infrasound at specific frequencies or within a limited frequency range, making it difficult to adapt to the complex and ever-changing underwater acoustic research and application scenarios. Furthermore, existing aerodynamic source technology is not mature enough in terms of amplification and stable maintenance of infrasound energy. It is difficult to raise the infrasound energy to a high level and maintain stable output over a wide frequency band, which limits its detection distance and signal resolution in practical applications and fails to meet the requirements of tasks such as deep-sea long-distance exploration and high-precision geological exploration. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an aerodynamic vibration source for underwater infrasound generation, capable of stably outputting infrasound waves over a wide frequency band.

[0006] This invention provides an aerodynamic source for underwater subsonic generation, comprising multiple aerodynamic source units, wherein some aerodynamic source units are main aerodynamic sources and the rest are auxiliary aerodynamic sources, the number of auxiliary aerodynamic sources is not less than the number of main aerodynamic sources, and an array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source, the emission ports of the multiple aerodynamic source units all face the same direction, each aerodynamic source unit includes a unidirectionally connected operating chamber and an emission chamber, the air inlet of the operating chamber is connected to an external air source to introduce inert gas into the operating chamber, and the emission port is located at the end of the emission chamber away from the operating chamber.

[0007] Optionally, the launch port of the main aerodynamic source protrudes beyond the launch port of the secondary aerodynamic source.

[0008] Optionally, the launch chamber is 5m-6m long, the internal cavity of the launch chamber is cylindrical, and the radius of the internal cavity of the launch chamber is 250mm-280mm.

[0009] Optionally, the length of the control room is 1m-2m, the internal cavity of the control room is cylindrical, and the radius of the internal cavity of the control room is equal to the radius of the internal cavity of the launch chamber.

[0010] Optionally, the outer shell 8 of the aerodynamic source unit, where the emission port is located, is arc-shaped.

[0011] Optionally, a passage is provided on the connecting wall between the control room and the launch room, and a cup-shaped flange is connected to the passage.

[0012] Optionally, the air inlet of the control room is equipped with an air inlet valve, which is connected to an air inlet pipe located inside the control room. The air outlet of the control room is equipped with a check valve, which is connected to a check pipe located inside the control room parallel to the air inlet pipe.

[0013] Optionally, the operating chamber is equipped with a flow control valve and a pressure balancing valve. The flow control valve is located in the gas passage of the cup flange. After being modulated by the flow control valve, the gas flow enters the launch chamber through the cup flange. The pressure balancing valve is connected to the air inlet of the operating chamber to keep the gas flow entering the operating chamber stable. The operating chamber is also equipped with a pressure sensor and a temperature sensor, and the launch chamber is also equipped with a flow sensor to monitor the gas flow rate in the launch chamber.

[0014] Optionally, the array distribution includes one of the following: planar array, three-dimensional array, ring array, grid array, spiral array, and fractal array.

[0015] Optionally, a connector 109 is fixed on the outer wall of each pneumatic vibration source unit, and the main pneumatic vibration source and the corresponding auxiliary pneumatic vibration source are connected and fixed through the connector 109.

[0016] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0017] This invention provides a pneumatic vibratory source for underwater infrasound generation. High-pressure inert gas enters the control chamber and, under its control, flows into the emission chamber. Upon triggering, the gas in the emission chamber is instantaneously released into the underwater environment through the emission port, forming bubbles. These bubbles generate sound waves due to cavitation. Because the bubble vibration frequency is low, infrasound waves are generated. By arranging auxiliary pneumatic vibratory sources around the main pneumatic vibratory source, the emission time of each emission chamber can be adjusted, and different frequency bands of infrasound waves can be generated, thereby amplifying the infrasound. The invention features a wide infrasound frequency band, and the generated infrasound energies can be superimposed. The infrasound emitted by the secondary aerodynamic source eliminates the ghosting signal generated during the sound generation process of the primary aerodynamic source, thereby effectively increasing the sound pressure level and the intensity of the infrasound. Because the gas diffuses instantly and uniformly after entering the emission chamber, local energy concentration and pressure surges are avoided, thus optimizing the bubble formation process and initial oscillation characteristics, and improving the stability of infrasound generation. The aerodynamic source for underwater infrasound generation provided by this invention can accurately generate wideband infrasound signals with an intensity of over 200 dB in underwater environments. The overall structural design fully considers the special requirements of underwater operations, featuring a simple structure, high environmental adaptability, and ease of operation. The infrasound frequency can be set and flexibly adjusted to meet the needs of different application scenarios for specific frequency infrasound signals. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal structure of an aerodynamic vibration source for underwater subacoustic generation provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a single aerodynamic vibration source unit structure provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of an array structure provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 101. Intake valve; 102. Intake pipe; 103. Check valve; 104. Check pipe; 105. Control room; 106. Cup flange; 107. Launch chamber; 108. Outer shell; 109. Connecting parts. Detailed Implementation

[0023] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Current infrasound generating structures can only produce infrasound at specific frequencies or within a limited frequency range, making them unsuitable for the complex and ever-changing underwater acoustic research and application scenarios. Furthermore, existing aerodynamic source technologies are not mature enough in terms of amplifying and maintaining stable infrasound energy, making it difficult to boost infrasound energy to a high level and maintain stable output across a wide frequency band. This limits the detection range and signal resolution in practical applications, failing to meet the requirements of long-distance deep-sea exploration and high-precision geological surveys.

[0026] Therefore, embodiments of the present invention provide an aerodynamic vibration source for underwater infrasound generation, which can stably output infrasound waves with a wide frequency band.

[0027] At least one embodiment of the present invention provides an aerodynamic source for underwater subacoustic generation, comprising multiple aerodynamic source units, wherein some aerodynamic source units are main aerodynamic sources and the rest are auxiliary aerodynamic sources, the number of auxiliary aerodynamic sources is not less than the number of main aerodynamic sources, and an array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source, the emission ports of the multiple aerodynamic source units all face the same direction, each aerodynamic source unit includes a unidirectionally connected operating chamber and an emission chamber, the air inlet of the operating chamber is connected to an external air source to introduce inert gas into the operating chamber, and the emission port is located at the end of the emission chamber away from the operating chamber.

[0028] In the aerodynamic source for underwater infrasound generation provided in the above embodiments of the present invention, by arranging the auxiliary aerodynamic source array around the main aerodynamic source, the emission time of each emission chamber can be adjusted and different frequency bands of infrasound can be generated. This widens the infrasound frequency band range, while the infrasound emitted by the auxiliary aerodynamic source eliminates the ghost signal generated during the sound generation process of the main aerodynamic source, and can also increase the intensity of the infrasound.

[0029] The present invention will be described below through several specific embodiments. To keep the following description of the embodiments clear and concise, detailed descriptions of known functions and components may be omitted. When any component of an embodiment of the present invention appears in more than one drawing, the component may be represented by the same reference numerals in each drawing.

[0030] refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the internal structure of an aerodynamic vibration source for underwater subacoustic generation, provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a single aerodynamic vibration source unit structure provided in an embodiment of the present invention, as shown below. Figure 1 and Figure 2 As shown, this embodiment of the invention provides an aerodynamic source for underwater infrasound generation, comprising multiple aerodynamic source units 1, wherein some aerodynamic source units 1 are main aerodynamic sources, and the rest are auxiliary aerodynamic sources. The number of auxiliary aerodynamic sources is not less than that of the main aerodynamic sources. An array of auxiliary aerodynamic sources corresponding to each main aerodynamic source is distributed around the main aerodynamic source. The emission ports of the multiple aerodynamic source units 1 all face the same direction, so that the infrasound waves emitted by the auxiliary aerodynamic sources can eliminate the ghost signal generated during the sound generation process of the main aerodynamic source. Each aerodynamic source unit 1 includes a one-way connected operating chamber 105 and an emission chamber 107. The air inlet of 105 is connected to an external air source to introduce inert gas into the operating chamber 105. The external high-pressure air source is an inert gas, which is not prone to chemical reaction with the medium, thus ensuring that the inside of the device is not corroded. The external high-pressure air source is connected to the operating chamber 105 through an underwater air pipe, thereby introducing the inert gas into the device. The emission port is located at the end of the emission chamber 107 away from the operating chamber 105. The emission chamber 107 is made of high-strength stainless steel, and its inner wall is precision machined and polished, so its surface roughness is very low, which can reduce gas flow resistance and turbulence, and improve energy conversion efficiency.

[0031] This invention provides a pneumatic vibratory source for underwater subsonic generation. High-pressure inert gas enters the control chamber and, under its control, enters the emission chamber. Upon triggering, the gas in the emission chamber is instantly released into the underwater environment through the emission port, forming bubbles. These bubbles generate sound waves due to cavitation. Because the bubble vibration frequency is low, infrasonic sound waves are generated. By arranging auxiliary pneumatic vibratory sources around the main pneumatic vibratory source, the emission time of each emission chamber can be adjusted, and different frequency bands of infrasonic waves can be generated, thereby widening the infrasonic frequency band. Simultaneously, the generated infrasonic wave energy can be superimposed. The infrasonic waves emitted by the auxiliary pneumatic vibratory sources eliminate the ghosting signal generated during the sound generation process of the main pneumatic vibratory source, effectively increasing the sound pressure level and intensity. Since the gas diffuses uniformly and instantaneously upon entering the emission chamber, local energy concentration and pressure abrupt changes are avoided, thus optimizing the bubble formation process and initial oscillation characteristics, improving the stability of infrasonic wave generation. The overall structural design fully considers the special requirements of underwater operations, featuring a simple structure, high environmental adaptability, and ease of operation. It can set and flexibly adjust the infrasound frequency to meet the needs of specific frequency infrasound signals in different application scenarios.

[0032] refer to Figure 3 , Figure 3 This is a schematic diagram of an array structure provided in an embodiment of the present invention, such as... Figure 3 As shown, the launch port of the main aerodynamic source protrudes beyond the launch port of the secondary aerodynamic source. The advantage of this design is that the secondary aerodynamic source can be started during the operation of the main aerodynamic source, rather than waiting for the main source to finish operating, thereby reducing the overall working cycle of the device.

[0033] In this embodiment of the invention, the launch chamber 107 is 5m-6m long, and its internal cavity is cylindrical with a radius of 250mm-280mm. In traditional pneumatic sources, when the baffle opens rapidly, air is released quickly, forming a high-pressure shock wave. This rapid release generates high-frequency sound waves in a short time. Because high-frequency signals are usually related to rapid pressure changes, the existence of acceleration distance causes air to be released in a short time, resulting in the generation of high-frequency energy. Compared to a traditional air gun with a diameter of about 100mm and a length of about 0.5m, the pneumatic source in this embodiment of the invention has a larger volume. The longer launch chamber 107 can lengthen the signal rise time, eliminate the acceleration distance, and slow down the air release speed. This means that the air release process is smoother and the pressure change is slower, thereby reducing the generation of high-frequency energy. This design produces a longer bubble period, which can effectively increase the low-frequency signal, making the signal of the pneumatic source more concentrated in the low-frequency band, rather than generating a lot of high-frequency noise, while optimizing the quality of infrasound.

[0034] Specifically, the length of the operating chamber 105 is 1m-2m, the internal cavity of the operating chamber 105 is cylindrical, and the radius of the internal cavity of the operating chamber 105 is equal to the radius of the internal cavity of the launch chamber 107.

[0035] Optionally, the part of the outer shell 108 of the pneumatic vibration source unit 1 where the emission port is located is arc-shaped. The arc-shaped top has the function of accelerating the airflow. The entire outer shell 108 is cylindrical. This shape is best for underwater environments. The outer shell 108 is made of high-strength stainless steel. The material of the outer shell 108 is specially selected and treated with anti-corrosion to resist certain water pressure and seawater corrosion.

[0036] Furthermore, a channel is provided on the connecting wall between the control chamber 105 and the launch chamber 107, and a cup-shaped flange 106 is connected to the channel. The control chamber 105 and the launch chamber 107 are separated from each other and connected by the cup-shaped flange 106. The cup-shaped flange 106 can withstand high pressure, maintain overall stability, and also plays a role in smoothing airflow. The cup-shaped flange 106 is made of high-strength titanium alloy, so it can withstand high pressure and airflow impact. The sealing surface of the cup-shaped flange 106 uses a special rubber sealing material, which can effectively prevent gas leakage. The control chamber 105 and the launch chamber 107 are connected through the cup-shaped flange 106 and the extension port. During the connection process, appropriate fastening bolts are used to tighten evenly to ensure the stability and tightness of the connection. The seal is good, allowing gas to flow smoothly between the two chambers. After exiting through the cup-shaped flange 106 and the channel, the gas enters the emission chamber 107. The extension port is nearly 360°, which can realize gas exchange between the operating chamber 105 and the emission chamber 107 over a wider range. This greatly increases the gas exchange efficiency between the emission chamber 107 and the operating chamber 105. After entering the emission chamber 107, the gas diffuses instantly and uniformly, avoiding local energy concentration and pressure changes. This optimizes the bubble formation process and initial oscillation characteristics, improves the stability of infrasound generation, and enhances the low-frequency signal transmission capability and overall broadband performance of the device.

[0037] In this embodiment, an air inlet valve 101 is provided at the air inlet of the operating chamber 105, and the air inlet valve 101 is connected to an air inlet pipe 102 located inside the operating chamber 105. A check valve 103 is provided at the air outlet of the operating chamber 105, and the check valve 103 is connected to a check pipe 104, which is parallel to the air inlet pipe 102 and located inside the operating chamber 105. The addition of the air inlet pipe 102 can smooth the input airflow, which is beneficial to improving the reliability and controllability of the device. The function of the check pipe 104 is to serve as an airflow path for balancing air pressure. When the gas pressure inside the operating chamber 105 is too high, it can flow out through the check pipe 104.

[0038] This invention provides a pneumatic vibrator for underwater subsonic generation. The rear end has an air inlet, which is sealed. An external high-pressure gas source connected to the air inlet valve 101 via an underwater air pipe can open the inlet. The inlet is strictly sealed to prevent external water from entering the device. The external high-pressure gas source is an inert gas, connected to the air inlet valve 101 via an underwater pipe. Simultaneously, the gas enters the operating chamber 105 via the air inlet pipe 102. The air inlet valve 101 and air inlet pipe 102 are located at the upper part of the operating chamber 105. Additionally, a check valve 103 and a check pipe 104 are also located at the upper part of the operating chamber 105. The air inlet pipe 102, check pipe 104, operating chamber 105, and emission chamber 107 constitute the entire airflow channel. The walls of the entire internal chamber and the inner walls of each pipe are streamlined, with smooth inner walls and gradually changing pipe diameters from the air inlet to the emission chamber 107. Gradual optimization ensures smooth gas flow within the device, reducing energy loss and turbulence. The inlet valve 101 has high-precision flow regulation capabilities, accurately controlling the inert gas flow into the inlet pipe 102 according to different operating conditions. The inlet pipe 102 has a diameter of 50mm and is made of titanium alloy, which has high strength and corrosion resistance, and can withstand the pressure of external high-pressure gas. Its smooth and streamlined interior greatly reduces gas flow resistance and turbulence, ensuring that high-pressure gas flows smoothly into the operating chamber 105. The check pipe 103 has a diameter of 30mm and a streamlined inner wall design. The check valve 103 and the check pipe 104 work together to ensure unidirectional gas flow within the operating chamber 105, strictly preventing gas backflow and avoiding equipment failure, energy loss, and potential safety hazards caused by backflow, thus ensuring the continuity and stability of the seismic source launch process. The control chamber 105 is made of titanium alloy. The air intake valve 101, the air intake pipe 102, and the control chamber 105 are integrated, thus ensuring the airtightness of the interior.

[0039] refer to Figure 1The control chamber 105 is equipped with a flow control valve and a pressure balancing valve. The flow control valve is located in the gas passage of the cup-shaped flange 106. After being modulated by the flow control valve, the gas flow enters the emission chamber 107 through the cup-shaped flange 106. The pressure balancing valve is connected to the air inlet of the control chamber 105 to ensure a stable gas flow into the control chamber 105. The control chamber 105 is also equipped with a pressure sensor and a temperature sensor, while the emission chamber 107 is equipped with a flow sensor to monitor the gas flow rate within the emission chamber 107. The flow control valve can precisely match the required gas volume according to different infrasound generation needs. The pressure balancing valve maintains a stable gas pressure within the control chamber 107. The pressure sensor can monitor the gas pressure within the control chamber 105 in real time to ensure that the gas entering the emission chamber 107 reaches the expected pressure value and operates within an efficient range. The temperature sensor monitors the temperature of the control chamber 105 to determine if the entire device is overheating, thereby ensuring normal operation. Under the control of the overall system, all valves and sensors ensure that the gas parameters within the emission chamber 107 reach the required parameters. When the control valve is opened, high-pressure gas will be released instantly. The pressure sensor can monitor the pressure of the gas in the launch chamber 107. When the gas pressure is lower than the target pressure, the system will control the inlet valve 101 and the valve in the control chamber 105 to react accordingly.

[0040] Optionally, the array distribution includes one of the following: planar array, three-dimensional array, ring array, grid array, spiral array, and fractal array. For example... Figure 3 The diagram illustrates a configuration with one secondary aerodynamic source arrayed on each side of a primary aerodynamic source. These three aerodynamic source units 1 form a linear array source. After the infrasound waves are emitted from different emission ports, their wavefronts interact in space in a specific manner to optimize the spatial distribution of acoustic energy. The array design allows for flexible adjustment of the spacing and layout between the emission units according to the underwater acoustic environment. By adjusting the emission time and airflow pressure of different emission units through the overall system, the spatial distribution of acoustic energy and complementary frequency characteristics can be achieved. For example, for a linear array consisting of six sources, to achieve 15Hz... Complementary characteristics within the -30Hz frequency range: Six seismic sources are divided into three groups of two sources each, one of which is the primary aerodynamic source and the other is the secondary aerodynamic source. The excitation signal of the first group mainly contains frequency components of 15Hz-20Hz, the second group mainly contains frequency components of 20Hz-25Hz, and the third group contains frequency components of 25Hz-30Hz. By controlling the frequency and amplitude of the excitation signal of each source, the infrasound waves emitted by them are superimposed in space, thereby achieving a smooth response and energy enhancement across the entire frequency range of 15Hz-30Hz, achieving the purpose of complementary frequency characteristics.

[0041] Specifically, a connector 109 is fixed to the outer wall of each pneumatic vibration source unit 1, and the main pneumatic vibration source and the corresponding auxiliary pneumatic vibration source are connected and fixed through the connector 109. Two hook devices are provided on the outer casing 108, and the distance between the two hooks is 800mm (along the axial direction). Figure 2 As can be seen, the hook provides a connection point during underwater positioning and deployment, ensuring that it does not shift due to water flow impact.

[0042] The outer shell 108 of the present invention is also provided with an array mounting position, and a connector 109 is provided at the array mounting position, such as a hook. Bolts are used to connect the outer shell 108 of different pneumatic vibration source units 1 to the bracket. The brackets are connected by hooks to achieve pair-by-pair combination. The brackets are designed according to different array needs. Different array methods and the relative positions and spacing of each pneumatic vibration source unit 1 can be selected according to different needs. By adjusting the depth and emission time of the secondary pneumatic vibration source in the array, the ghost signal generated during the sound emission process of the main pneumatic vibration source can be eliminated, and its ultra-low frequency sound emission performance can be optimized.

[0043] It is worth noting that the diameter and length of the aforementioned operating chamber 105 and launching chamber 107 can be appropriately adjusted according to actual conditions, with sealing being the primary standard.

[0044] After the above components are assembled, the airtightness needs to be checked again, and overall debugging should be carried out in the land lake. Connect an external high-pressure air source, and gradually adjust the opening of the air inlet valve through the control system, starting from the minimum flow rate and slowly increasing the gas flow rate. At the same time, observe the pressure changes in the control chamber 105 and the emission chamber 107, as well as the flow rate changes in the air inlet pipe 102. Check whether the check valve 103 and check pipe 104 are working properly to prevent gas backflow. Test the frequency characteristics of the generated infrasound under different flow rate settings, and fine-tune the relevant parameters according to the test results to optimize the frequency range and energy output of the infrasound, ensuring that the equipment can stably generate high-energy infrasound signals in a wide frequency band. Also check whether the components work together normally and whether there are any abnormal vibrations, noises, or leaks.

[0045] The working process of this invention is as follows: External high-pressure inert gas is connected to the inlet valve 101 through an underwater pipeline. After the inlet valve 101 precisely adjusts the gas flow rate according to preset parameters or real-time control signals, the gas enters the operating chamber 105 through the inlet pipe 101. The pressure balancing valve in the operating chamber 105 maintains a stable pressure. The airflow is modulated by the flow control valve and enters the launch chamber through the channel connected by the flanges of the two. At the same time, the flow sensor monitors the modulated airflow and further precisely distributes the gas flow to the launch chamber 107. The gas enters the launch chamber 107 through the cup-shaped flange 106 and the extension port. In the launch chamber 107, the gas is launched into the underwater environment by the precisely adjusted length of the launch chamber 107. The gas generates bubbles upon contact with the water. After the bubbles burst due to cavitation effect, they generate infrasound with wide bandwidth, high energy, and excellent low-frequency characteristics. At the same time, the system adjusts the pressure of the launched gas, the launch interval, and other parameters according to the frequency of the generated infrasound.

[0046] Throughout the process, check valve 103 and check pipe 104 prevent gas backflow, the airflow channel ensures stable and efficient gas transmission, and sensors monitor key parameters in real time and feed them back to the control system for precise control of each component.

[0047] The above inventions are merely a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An aerodynamic vibration source for underwater subsonic generation, characterized in that, It includes multiple aerodynamic source units (1), some of which are main aerodynamic sources and the rest are secondary aerodynamic sources. The number of secondary aerodynamic sources is not less than that of the main aerodynamic sources. The secondary aerodynamic source array corresponding to each main aerodynamic source is distributed around the main aerodynamic source. The emission ports of the multiple aerodynamic source units (1) all face the same direction. Each of the pneumatic vibration source units (1) includes a one-way connected operating chamber (105) and a launching chamber (107). The air inlet of the operating chamber (105) is connected to an external air source to introduce inert gas into the operating chamber (105). The launching port is located at the end of the launching chamber (107) away from the operating chamber (105). The emission port of the main aerodynamic source protrudes beyond the emission port of the secondary aerodynamic source; The launch chamber (107) is 5m-6m long, and the internal cavity of the launch chamber (107) is cylindrical with a radius of 250mm-280mm. By arranging the secondary aerodynamic source array around the primary aerodynamic source, the emission time of each emission chamber (107) can be adjusted and different frequency bands of infrasound can be generated, thereby widening the infrasound frequency band. At the same time, the generated infrasound energy can be superimposed. The infrasound emitted by the secondary aerodynamic source eliminates the ghost signal generated during the sound emission process of the primary aerodynamic source, thereby effectively increasing the sound pressure level and also increasing the intensity of the infrasound.

2. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The length of the operating chamber (105) is 1m-2m, and the internal cavity of the operating chamber (105) is cylindrical. The radius of the internal cavity of the operating chamber (105) is equal to the radius of the internal cavity of the launch chamber (107).

3. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The portion of the outer shell (108) of the aerodynamic source unit (1) containing the emission port is arc-shaped.

4. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The operating room (105) and the launching room (107) have a connecting wall with a channel, and a cup-shaped flange (106) is connected to the channel.

5. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The air inlet of the operating chamber (105) is provided with an air inlet valve (101), the air inlet valve (101) is connected to an air inlet pipe (102), the air inlet pipe (102) is located inside the operating chamber (105), the air outlet of the operating chamber (105) is provided with a check valve (103), the check valve (103) is connected to a check pipe (104), the check pipe (104) is arranged parallel to the air inlet pipe (102) inside the operating chamber (105).

6. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The operating chamber (105) is equipped with a flow control valve and a pressure balancing valve. The flow control valve is located in the gas passage of the cup flange (106). After being modulated by the flow control valve, the airflow enters the launch chamber (107) through the cup flange (106). The pressure balancing valve is connected to the air inlet of the operating chamber (105) to keep the airflow entering the operating chamber (105) in a stable state. The operating chamber (105) is also equipped with a pressure sensor and a temperature sensor. The launch chamber (107) is also equipped with a flow sensor to monitor the gas flow rate in the launch chamber (107).

7. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, The array distribution includes one of the following: planar array, three-dimensional array, ring array, grid array, spiral array, and fractal array.

8. The aerodynamic vibration source for underwater subacoustic generation as described in claim 1, characterized in that, Each of the aerodynamic source units (1) has a connector (109) fixed on its outer wall, and the main aerodynamic source and the corresponding auxiliary aerodynamic source are connected and fixed through the connector (109).

Images