A moving-coil low-frequency sound source active pressure compensation closed-loop control system and method

Abstract

The application relates to a moving-coil low-frequency sound source active pressure compensation closed-loop control system and method, which measures the amount of the sound source radiation surface deviating from the balance position through a displacement sensor, adjusts the gas flow direction, controls the gas amount in the sound source radiation cavity space, always maintains the radiation surface at the balance position, realizes active compensation control of the gas pressure, and makes the gas pressure in the sound source radiation cavity always equal to the ambient water pressure. The application realizes the balance between the pressure in the internal cavity of the sound source radiation surface and the external water pressure, and realizes closed control of pressure regulation through the gas circulation mode.

Description

Technical Field

[0001] This invention belongs to the field of underwater sound source technology, and in particular relates to a closed-loop control system and method for active pressure compensation of a moving coil low-frequency sound source. Background Technology

[0002] A moving-coil low-frequency sound source is a relatively lightweight, low-frequency emission primary sound source that can be used as a low-frequency standard sound source in research on low-frequency detection and other technologies. Moving-coil low-frequency sound sources are often used to simulate the low-frequency characteristics of underwater targets such as ships, thereby verifying, training, and improving detection systems and equipment by detecting and sensing the signals of simulated targets.

[0003] The key feature of this sound source is that its acoustic emission piston surface must always be in a balanced position within the emission system. The conventional method is to connect a constant pressure airbag in series. As the working water depth increases, the airbag contracts, making the pressure inside the cavity equal to the external water pressure, thus achieving automatic pressure balance between the inside and outside of the acoustic emission piston surface.

[0004] The biggest drawback of the conventional bladder automatic pressure balancing method for this sound source is that its volume varies greatly with different working water depths. This causes significant changes in the bladder volume, resulting in large variations in the buoyancy generated by the system. During testing on the aircraft, this poses a challenge to the aircraft's buoyancy adjustment capabilities and its ability to dive. Summary of the Invention

[0005] To address the aforementioned technical challenges in the onboard testing, this application provides a dynamic low-frequency sound source active pressure compensation closed-loop control method. Through the design of the active pressure compensation closed-loop control system, its volume and mass remain unchanged within the operating water depth range, thus solving the technical challenges brought about by changes in buoyancy and buoyancy center to the control of the onboard vehicle.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A closed-loop control system for active pressure compensation of a moving-coil low-frequency sound source, the system comprising: The active buoyancy control chamber, miniature high-pressure pump, atmospheric pressure chamber, high-pressure chamber, water pressure sensor, displacement sensor, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, pressure reducing valve, and controller. The miniature high-pressure pump, atmospheric pressure chamber, high-pressure chamber, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, pressure reducing valve and controller are integrated in the active buoyancy regulating chamber. The water pressure sensor and displacement sensor are installed outside the housing of the moving-coil low-frequency sound source; the displacement sensor is used to measure the amount by which the sound source's radiation surface deviates from its equilibrium position. A ventilation port is installed on the buoyancy-active adjustment chamber. One end of the ventilation port is connected to the internal cavity of the sound source radiation surface, and the other end is connected to the replenishment air passage and the return air passage. The gas replenishment circuit includes a first gas pressure sensor, a first solenoid valve, a regulating valve, a pressure reducing valve, and a high-pressure chamber connected in sequence. The return gas path includes a second solenoid valve, an atmospheric pressure chamber, a second pressure sensor, a one-way valve, a miniature high-pressure pump, a third solenoid valve, a third pressure sensor, and a high-pressure chamber connected in sequence. The controller is connected to the micro high-pressure pump, water pressure sensor, displacement sensor, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, and pressure reducing valve for power supply and communication.

[0007] Furthermore, the high-pressure chamber is equipped with a high-pressure chamber inspection port for replenishing air to the high-pressure chamber and for inspection.

[0008] The present invention also provides an active pressure compensation closed-loop control method based on the above-mentioned active pressure compensation closed-loop control system for a moving-coil low-frequency sound source, the method comprising: The displacement sensor measures the amount by which the sound source radiation surface deviates from its equilibrium position, adjusts the gas flow direction to replenish or return gas, and thus controls the amount of gas in the sound source radiation cavity, so that the sound source radiation surface is always kept in the equilibrium position. This achieves active gas pressure compensation control, ensuring that the gas pressure in the sound source radiation cavity is always equal to the ambient water pressure.

[0009] The process of replenishing Qi is as follows: Assuming that the direction of movement of the radiation surface is positive when the sound source radiation cavity is compressed; when the displacement sensor detects that the sound source radiation surface is deviating from the equilibrium position, the regulating valve, the pressure reducing valve, and the first solenoid valve are opened in sequence, and the high-pressure gas stored in the high-pressure chamber and the gas in the sound source radiation cavity are automatically replenished by the pressure difference; until the displacement sensor detects that the sound source radiation surface is in the equilibrium position, the regulating valve, the pressure reducing valve, and the first solenoid valve are closed. The process of gas return is as follows: Assuming the sound source radiation cavity expands, and the outward movement of the radiation surface is negative; when the displacement sensor detects a negative deviation of the sound source radiation surface from its equilibrium position, the third solenoid valve and the miniature high-pressure pump are opened, drawing gas from the atmospheric pressure chamber to the high-pressure chamber, achieving a certain vacuum level in the atmospheric pressure chamber; after closing the third solenoid valve and the miniature high-pressure pump, the second solenoid valve is opened, allowing the gas in the cavity inside the sound source radiation surface to flow back to the atmospheric pressure chamber under the influence of pressure difference. After the first and second gas pressure sensors reach equilibrium, the second solenoid valve is closed; if the displacement sensor detects that the sound source radiation surface is still negatively deviating from its equilibrium position, the gas return process is repeated until the displacement sensor detects that the sound source radiation surface is at its equilibrium position. Through the various solenoid valves and the miniature high-pressure pump, gas circulates between the high-pressure chamber and the cavity inside the sound source radiation chamber, completing the pressure regulation process.

[0010] This invention uses a comparison between a water pressure sensor and a third gas pressure sensor to determine the compensation capability of the high-pressure chamber, and then to determine whether the maximum working water depth has been reached.

[0011] This invention uses a displacement sensor to measure the deviation of the sound source radiation surface from its equilibrium position, adjusts the gas flow direction, and controls the amount of gas in the sound source radiation cavity to maintain the radiation surface in its equilibrium position. This achieves active gas pressure compensation control, ensuring that the gas pressure in the sound source radiation cavity is always equal to the ambient water pressure.

[0012] During implementation, the gas is circulated between the high-pressure chamber and the sound source radiation cavity by switching on and off different solenoid valves and micro pumps, thus completing the pressure regulation process.

[0013] The controller of this invention is not limited to PLC; other control methods such as microcontrollers can also be used. When a PLC controller is used, the PLC acts as the main controller, determining the opening and closing of each valve based on information from various sensors. The PLC also has communication capabilities. The PLC controller may include voltage conversion modules for each solenoid valve and sensor. The PLC controller has signal connections with each solenoid valve and sensor.

[0014] The present invention includes an atmospheric pressure chamber, which can prevent the gas inside the cavity of the sound source radiation surface from being rapidly extracted when the micro high-pressure pump is activated, thus preventing damage to the sound source radiation system.

[0015] This invention achieves a balanced position where the sound source radiation surface is always at "zero" by increasing or decreasing the amount of gas in the cavity inside the sound source radiation surface.

[0016] This invention controls the flow direction of gas in the gas supply or return circuit by controlling the on / off sequence of the first, second, and third solenoid valves.

[0017] The gas required for regulating the gas pressure in the inner cavity of the sound source radiation in this invention can be reused repeatedly, theoretically indefinitely, without causing any gas loss.

[0018] This invention controls the outlet gas pressure of the high-pressure chamber to be equivalent to the real-time water pressure through a pressure reducing valve, thus ensuring a smooth gas replenishment process.

[0019] The atmospheric pressure chamber of this invention should have a large volume and be able to withstand a certain negative pressure (vacuum).

[0020] The high-pressure chamber of this invention is pre-filled with high-pressure gas, and the pressure of the high-pressure gas inside the chamber is not lower than the maximum operating environment pressure of the system.

[0021] The maximum output pressure of the miniature high-pressure pump of this invention cannot exceed the maximum permissible internal pressure of the high-pressure chamber.

[0022] The buoyancy-actively-adjustable hull of this invention is mainly used for the installation and integration of pressure compensation systems and for protecting pressure-bearing structures.

[0023] The present invention also includes a ventilation interface for connecting the internal cavity of the sound source radiating surface with the air path of the pressure compensation system.

[0024] The present invention also includes a signal interface for transmitting signals from the displacement sensor and the water pressure sensor to the buoyancy active adjustment chamber for communication with the control PLC.

[0025] The present invention also includes a high-pressure chamber inspection port for routine pressure checks of the high-pressure chamber and for replenishing the high-pressure chamber with gas.

[0026] The present invention also includes an electrical interface for electrical inspection, information transmission and internal power supply.

[0027] The displacement sensor of the present invention is used to measure the offset equilibrium position value of the radiation surface of a sound source.

[0028] The miniature high-pressure pump of the present invention is used to draw out the gas from the cavity inside the sound source radiation surface and compress it into the high-pressure chamber for storage. The atmospheric pressure chamber of this invention is located between the internal cavity of the sound source radiating surface and the micro high-pressure pump. It serves as an isolation buffer chamber for gas conversion between the internal cavity of the sound source radiating surface and the micro high-pressure pump. It is opened in sequence by the second solenoid valve and the one-way valve to prevent the micro high-pressure pump from directly and rapidly extracting the gas in the internal cavity of the sound source radiating surface when it is in operation, which would cause negative high pressure to be generated in the internal cavity of the sound source radiating surface and damage the radiating surface vibration system.

[0029] The method of achieving pressure balance between the internal cavity of the sound source radiating surface and the external water pressure in this invention also achieves closed-loop pressure regulation control through gas circulation. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the active pressure compensation closed-loop control system for the moving-coil low-frequency sound source of the present invention. Appendix Figure 1 The list of components represented by each number is as follows: 1. Buoyancy-actively-adjustable chamber; 2. Signal interface; 3. Water pressure sensor; 4. Displacement sensor; 5. First gas pressure sensor; 6. First solenoid valve; 7. Ventilation interface; 8. Second solenoid valve; 9. Atmospheric pressure chamber; 10. Second gas pressure sensor; 11. Check valve; 12. Miniature high-pressure pump; 13. Third solenoid valve; 14. Third gas pressure sensor; 15. High-pressure chamber; 16. High-pressure chamber inspection port; 17. Electrical interface; 18. Regulating valve; 19. Pressure reducing valve; 20. Controller. Detailed Implementation

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1 like Figure 1 As shown, a closed-loop control system for active pressure compensation of a moving-coil low-frequency sound source is disclosed, the system comprising: The active buoyancy regulating chamber 1, miniature high-pressure pump 12, atmospheric pressure chamber 9, high-pressure chamber 15, water pressure sensor 3, displacement sensor 4, first gas pressure sensor 5, second gas pressure sensor 10, third gas pressure sensor 14, first solenoid valve 6, second solenoid valve 8, third solenoid valve 13, one-way valve 11, regulating valve 18, pressure reducing valve 19, and controller 20. The miniature high-pressure pump 12, atmospheric pressure chamber 9, high-pressure chamber 15, first gas pressure sensor 5, second gas pressure sensor 10, third gas pressure sensor 14, first solenoid valve 6, second solenoid valve 8, third solenoid valve 13, one-way valve 11, regulating valve 18, pressure reducing valve 19 and controller 20 are integrated and installed in the buoyancy active regulating chamber 1. Water pressure sensor 3 and displacement sensor 4 are installed outside the housing of the moving coil low-frequency sound source; displacement sensor 4 is used to measure the amount by which the sound source radiation surface deviates from the equilibrium position. A ventilation port 7 is provided on the buoyancy active adjustment chamber 1. One end of the ventilation port 7 is connected to the internal cavity of the sound source radiation surface, and the other end is connected to the replenishment air passage and the return air passage. The gas replenishment circuit includes a first gas pressure sensor 5, a first solenoid valve 6, a regulating valve 18, a pressure reducing valve 19, and a high-pressure chamber 15 connected in sequence. The return gas path includes a second solenoid valve 8, an atmospheric pressure chamber 9, a second pressure sensor, a one-way valve 11, a miniature high-pressure pump 12, a third solenoid valve 13, a third gas pressure sensor 14, and a high-pressure chamber 15 connected in sequence. The controller 20 is connected to the miniature high-pressure pump 12, water pressure sensor 3, displacement sensor 4, first gas pressure sensor 5, second gas pressure sensor 10, third gas pressure sensor 14, first solenoid valve 6, second solenoid valve 8, third solenoid valve 13, check valve 11, regulating valve 18, and pressure reducing valve 19 via signal interface 2 and electrical interface 17 for power supply and communication. Both signal interface 2 and electrical interface 17 enable telecommunication connections such as communication and power supply.

[0034] Furthermore, the high-pressure chamber 15 is provided with a high-pressure chamber inspection port 16 for replenishing air to the high-pressure chamber and for inspection.

[0035] An active pressure compensation closed-loop control method based on the above-mentioned active pressure compensation closed-loop control system for a moving-coil low-frequency sound source, the method comprising: Displacement sensor 4 measures the amount by which the sound source radiation surface deviates from its equilibrium position, adjusts the gas flow direction to replenish or return gas, and thus controls the amount of gas in the sound source radiation cavity, so that the sound source radiation surface is always kept in the equilibrium position, realizing active gas pressure compensation control, and ensuring that the gas pressure in the sound source radiation cavity is always equal to the ambient water pressure.

[0036] The process of replenishing Qi is as follows: Assuming that the direction of movement of the radiation surface is positive when the sound source radiation cavity is compressed; when the displacement sensor 4 detects that the sound source radiation surface is deviating from the equilibrium position, the regulating valve 18, the pressure reducing valve 19, and the first solenoid valve 6 are opened in sequence, and the high-pressure gas stored in the high-pressure chamber 15 is automatically replenished by the pressure difference between the gas in the sound source radiation cavity and the high-pressure gas stored in the high-pressure chamber 15; until the displacement sensor 4 detects that the sound source radiation surface is in the equilibrium position, the regulating valve 18, the pressure reducing valve 19, and the first solenoid valve 6 are closed; The process of gas return is as follows: Assuming the sound source radiation cavity expands, and the outward movement of the radiation surface is negative; when displacement sensor 4 detects a negative deviation of the sound source radiation surface from its equilibrium position, the third solenoid valve 13 and the miniature high-pressure pump 12 are opened, drawing gas from the atmospheric pressure chamber 9 to the high-pressure chamber 15, achieving a certain vacuum level in the atmospheric pressure chamber 9; after closing the third solenoid valve 13 and the miniature high-pressure pump 12, the second solenoid valve 8 is opened, allowing gas in the cavity inside the sound source radiation surface to flow back to the atmospheric pressure chamber 9 under the influence of pressure difference. After the first gas pressure sensor 5 and the second gas pressure sensor 10 reach equilibrium, the second solenoid valve 8 is closed; if displacement sensor 4 detects that the sound source radiation surface is still negatively deviating from its equilibrium position, the gas return process is repeated until displacement sensor 4 detects that the sound source radiation surface is at its equilibrium position. Through the solenoid valves and the miniature high-pressure pump 12, gas circulates between the high-pressure chamber 15 and the cavity inside the sound source radiation chamber, completing the pressure regulation process.

[0037] This invention uses a comparison between the water pressure sensor 3 and the third gas pressure sensor 14 to determine the compensation capability of the high-pressure chamber 15, and then to determine whether the maximum working water depth has been reached.

[0038] In this invention, the controller includes voltage conversion modules for each solenoid valve and sensor. The controller has signal / power supply connections to each solenoid valve and sensor. Figure 1 Simplified representations are not shown. The controller, solenoid valves, sensors, and other components used in this invention are all commercially available.

[0039] The low-frequency sound source active pressure compensation control method provided by this invention utilizes compressed gas as a balancing compensation medium to fill the inner cavity of the sound source radiation chamber, or to compress the gas in the inner cavity of the sound source radiation chamber into the high-pressure chamber 15. This ensures that the medium pressure on both sides of the radiation surface is balanced, while also ensuring that the radiation surface is in a "zero-position" equilibrium position. Because the density of compressed gas is very low compared to metal, the flow of gas in different cavities during the balancing compensation process causes minimal changes in the overall center of gravity and center of buoyancy. This completely solves the problem in conventional technologies where large variations in the buoyancy and center of buoyancy of the sound source due to different water depths pose significant challenges to system balance control and buoyancy adjustment.

[0040] Theoretically, the sound source in this invention can be used in water depths of unlimited magnitude. However, in practice, due to limitations such as device capabilities and the power source of the sound source, the working water depth of the sound source is limited to within 250 meters.

[0041] All aspects not described in detail in this invention can be covered using conventional technical knowledge in the field.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A closed-loop control system for active pressure compensation of a moving-coil low-frequency sound source, characterized in that, The system includes: The active buoyancy control chamber, miniature high-pressure pump, atmospheric pressure chamber, high-pressure chamber, water pressure sensor, displacement sensor, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, pressure reducing valve, and controller. The miniature high-pressure pump, atmospheric pressure chamber, high-pressure chamber, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, pressure reducing valve and controller are integrated in the active buoyancy regulating chamber. The water pressure sensor and displacement sensor are installed outside the housing of the moving-coil low-frequency sound source; the displacement sensor is used to measure the amount by which the sound source's radiation surface deviates from its equilibrium position. A ventilation port is installed on the buoyancy-active adjustment chamber. One end of the ventilation port is connected to the internal cavity of the sound source radiation surface, and the other end is connected to the replenishment air passage and the return air passage. The gas replenishment circuit includes a first gas pressure sensor, a first solenoid valve, a regulating valve, a pressure reducing valve, and a high-pressure chamber connected in sequence. The return gas path includes a second solenoid valve, an atmospheric pressure chamber, a second pressure sensor, a one-way valve, a miniature high-pressure pump, a third solenoid valve, a third pressure sensor, and a high-pressure chamber connected in sequence. The controller is connected to the micro high-pressure pump, water pressure sensor, displacement sensor, first gas pressure sensor, second gas pressure sensor, third gas pressure sensor, first solenoid valve, second solenoid valve, third solenoid valve, check valve, regulating valve, and pressure reducing valve for power supply and communication.

2. The active pressure compensation closed-loop control system for a moving-coil low-frequency sound source according to claim 1, characterized in that, The high-pressure chamber is equipped with a high-pressure chamber inspection port for replenishing air and conducting inspections.

3. An active pressure compensation closed-loop control method based on the active pressure compensation closed-loop control system for a moving-coil low-frequency sound source according to claim 1 or 2, the method comprising: The displacement sensor measures the amount by which the sound source radiation surface deviates from its equilibrium position, adjusts the gas flow direction to replenish or return gas, and thus controls the amount of gas in the sound source radiation cavity, so that the sound source radiation surface is always kept in the equilibrium position. This achieves active gas pressure compensation control, ensuring that the gas pressure in the sound source radiation cavity is always equal to the ambient water pressure.

4. The active pressure compensation closed-loop control method according to claim 3, characterized in that, The process of replenishing Qi is as follows: Assuming that the direction of movement of the radiation surface is positive when the sound source radiation cavity is compressed; when the displacement sensor detects that the sound source radiation surface is deviating from the equilibrium position, the regulating valve, the pressure reducing valve, and the first solenoid valve are opened in sequence, and the high-pressure gas stored in the high-pressure chamber and the gas in the sound source radiation cavity are automatically replenished by the pressure difference; until the displacement sensor detects that the sound source radiation surface is in the equilibrium position, the regulating valve, the pressure reducing valve, and the first solenoid valve are closed. The process of gas return is as follows: Assuming the sound source radiation cavity expands, and the outward movement of the radiation surface is negative; when the displacement sensor detects a negative deviation of the sound source radiation surface from its equilibrium position, the third solenoid valve and the miniature high-pressure pump are opened to pump the gas from the atmospheric pressure chamber to the high-pressure chamber, achieving a certain vacuum in the atmospheric pressure chamber; after closing the third solenoid valve and the miniature high-pressure pump, the second solenoid valve is opened to allow the gas in the cavity inside the sound source radiation surface to flow back to the atmospheric pressure chamber under the action of pressure difference. After the first and second gas pressure sensors reach equilibrium, the second solenoid valve is closed; if the displacement sensor detects that the sound source radiation surface is still negatively deviating from its equilibrium position, the gas return process is repeated until the displacement sensor detects that the sound source radiation surface is at its equilibrium position.

5. The active pressure compensation closed-loop control method according to claim 3, characterized in that, By comparing the water pressure sensor and the third gas pressure sensor, the compensation capability of the high-pressure chamber is determined, thereby determining whether the maximum working water depth has been reached.

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