An adjustable buoy noise measurement system

Abstract

The present invention discloses an adjustable submersible noise measurement system, comprising an underwater instrument cabin, an optoelectronic transmission cable, an optical fiber hydrophone array, an expander, a mooring device, and a surface communication buoy. The optical fiber hydrophone array receives noise signals radiated by underwater targets and transmits the signals to the underwater instrument cabin via the optoelectronic transmission cable. The underwater instrument cabin is fixed to the seabed by the mooring device and connected to the surface communication buoy. The expander is fixed to the seabed by a hook anchor, and the optical fiber hydrophone array is adjusted by the expander to achieve horizontal deployment. The underwater instrument cabin and the expander are positively buoyant structures, thereby forming a trapezoidal structure underwater. The present invention utilizes the expander to retract and extend the optoelectronic transmission cable and hook anchor to control the entire array to be horizontal underwater and stabilize the array's posture. When the array's posture reaches the required posture for equipment testing, the expander stops working, and the equipment is now in a silent state and does not generate any noise, thereby reducing the impact of noise generated by the equipment itself.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater acoustic measurement and detection, and in particular to an adjustable submerged buoy noise measurement system. Background Art

[0002] To achieve underwater deployment and horizontal stability of the fiber optic hydrophone array, an underwater self-regulating noise sensing system is required. This system typically consists of a current sail, a fiber optic hydrophone array, and a driven deployer. The system's battery pack is housed within the deployed deployer, powering the propeller within. During operation, the deployer advances against the current, pulling the fiber optic hydrophone array with the current sail suspended from the end of the array. The current sail rotates with the current to maximize the incoming flow area and resistance, allowing the hydrophone array to fully deploy in the water. However, this solution relies on automatic flow regulation, making it impossible to manually intervene when the current is unfavorable. Furthermore, the system's operational flow resistance to the canopy is significant, and the propeller is constantly under load, generating noise that interferes with the system's monitoring of both the environment and target noise. Summary of the Invention

[0003] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide an adjustable buoy noise measurement system to solve the problems of the existing underwater buoy measurement system being unable to remotely adjust the array posture and having excessive self-noise.

[0004] To achieve the purpose of the present invention, the technical solution adopted by the present invention is:

[0005] An adjustable submersible noise measurement system includes an underwater instrument cabin, an optoelectronic transmission cable, an optical fiber hydrophone array, a deployer, a mooring device, and a surface communication buoy;

[0006] The optical fiber transmission cable connects the underwater instrument cabin and the fiber optic hydrophone array. The fiber optic hydrophone array receives the noise signal radiated by the underwater target and transmits the signal to the underwater instrument cabin through the optical fiber transmission cable.

[0007] The underwater instrument cabin is fixed to the seabed by mooring equipment and connected to the surface communication buoy; the fiber optic hydrophone array and the deployer are connected by optoelectronic transmission cables, the deployer is fixed to the seabed by a hook anchor, and the fiber optic hydrophone array is adjusted by the deployer to achieve horizontal deployment; the underwater instrument cabin and the deployer are positive buoyancy structures, thus forming a trapezoidal structure underwater.

[0008] Furthermore, the underwater instrument cabin includes a light source light modulation and amplification sub-unit, a photoelectric signal demodulation sub-unit, a data storage device, a power supply device and an instrument cabin body;

[0009] Photoelectric signal demodulation subunit, used for photoelectric signal demodulation processing of underwater target radiation noise signal transmitted by photoelectric transmission cable;

[0010] The light source optical modulation and amplification sub-unit transmits the prepared light source to the fiber optic hydrophone array through the optoelectronic transmission cable to provide input light for it.

[0011] Furthermore, the mooring device consists of a gravity anchor and a claw anchor.

[0012] Furthermore, the optoelectronic transmission cable adopts a flexible floating cable, which is connected to the underwater instrument cabin and the fiber optic hydrophone array through a watertight connector.

[0013] Furthermore, the deployer is composed of a tail winch, a bottom winch, a battery compartment, a hook anchor, a buoy, and a frame;

[0014] The tail winch is used to retract and extend the optical transmission cable at the tail of the fiber-optic hydrophone array, straightening the array. The tail winch has a smooth ring, which allows the optical signal to be transmitted normally while the winch is rotating.

[0015] The bottom winch retracts and releases the hook anchor through the cable, adjusting the depth of the deployer to keep it consistent with the height of the underwater instrument cabin, so that the entire array is level underwater.

[0016] Furthermore, a depth pressure sensor is installed on the deployer.

[0017] Furthermore, the size of the deployer is comparable to that of the underwater instrument cabin, and the ocean current forces acting on both ends of the fiber optic hydrophone array are the same.

[0018] Furthermore, when the system is deployed, the deployment vessel sequentially throws out the deployer hook anchor, deployer, fiber optic hydrophone array, surface communication buoy, and underwater instrument cabin; the deployment vessel sails a certain distance with the gravity anchor and then releases the underwater instrument cabin mooring equipment.

[0019] Furthermore, when the system is recovered, the cables at the bottom of the deployer and the underwater instrument cabin are cut, and the gravity anchor and hook anchor are released respectively, and the deployer and the underwater instrument cabin can float to the surface with the fiber optic hydrophone array.

[0020] The beneficial effect of the present invention is that, compared with the existing technology, the present invention uses a deployer to retract and extend the photoelectric transmission cable and hook anchor to control the entire array to be level underwater and stabilize the array posture. When the array posture reaches the posture required for equipment testing, the deployer stops working. At this time, the equipment is in a silent state and does not generate any noise, thereby reducing the impact of noise generated by the equipment itself and effectively improving the working efficiency of the equipment.

[0021] The present invention solves the problems of the existing underwater buoy measurement system that the array attitude cannot be remotely adjusted and the self-noise is too large; it improves the long-distance measurement distance of underwater noise; and provides basic research data for the study of target noise characteristic evaluation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the adjustable buoy noise measurement system of the present invention;

[0023] Figure 2 is a schematic diagram of the expander structure;

[0024] Figure 3 It is a schematic diagram of system deployment;

[0025] Figure 4 It is a schematic diagram of the system expansion;

[0026] Figure 5 It is the force analysis diagram when the system is stable;

[0027] Figure 6 This is a simulation diagram of different landing points of gravity anchor;

[0028] Figure 7 This is a schematic diagram of the system after the gravity anchor sinks to the bottom. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of this application.

[0030] like Figure 1 As shown, the adjustable submerged buoy noise measurement system of the present invention includes an underwater instrument cabin, an optoelectronic transmission cable, an optical fiber hydrophone array, a deployer, a mooring device, and a surface communication buoy.

[0031] The underwater instrument cabin receives noise signals transmitted from the fiber-optic hydrophone array. It primarily includes a light source optical modulation and amplification subunit, an optoelectronic signal demodulation subunit, data storage, a power supply, and the main cabin body. These units are responsible for optoelectronic signal demodulation and data storage. The light source is transmitted to the fiber-optic hydrophone array via an optoelectronic transmission cable, providing input light. The power supply provides power to the underwater instrument cabin and the fiber-optic hydrophone array.

[0032] The fiber-optic hydrophone array is used to receive noise signals radiated by underwater targets and transmit the signals to the underwater instrument cabin for detection via an optoelectronic transmission cable. The fiber-optic hydrophone array includes a fiber-optic hydrophone array and an attitude depth sensor.

[0033] The optical transmission cable connects the underwater instrument cabin and the fiber optic hydrophone array via a watertight connector. This flexible floating cable provides a transmission channel for input and signal light to the fiber optic hydrophone array, and also provides power and data access for the attitude and depth sensors in the fiber optic hydrophone array.

[0034] The underwater instrument cabin is fixed to the seabed by mooring equipment and connected to the surface communication buoy; the mooring equipment mainly consists of gravity anchors and claw anchors, which enable the entire system to be stably anchored to the seabed.

[0035] The fiber optic hydrophone array and the deployer are also connected through an optoelectronic transmission cable. The fiber optic hydrophone array is adjusted by the deployer to achieve horizontal deployment.

[0036] The underwater instrument cabin and deployer are positive buoyancy structures, fixed underwater by mooring equipment and hook anchors, thus forming a trapezoidal structure underwater.

[0037] like Figure 2 As shown, the deployer primarily consists of a tail winch, a bottom winch, a battery compartment, a hook and anchor, a float, and a frame. The tail winch is used to retract and extend the optical transmission cable at the tail of the fiber-optic hydrophone array, straightening the array. The tail winch has a smooth ring, ensuring that optical signals can be transmitted even when the winch is rotating. The bottom winch retracts and extends the hook and anchor using a cable, adjusting the deployer's depth to align it with the underwater instrument compartment, thereby keeping the entire array horizontal underwater. The batteries power the deployer's motors, primarily the tail winch and the bottom winch.

[0038] The deployer is equipped with a depth pressure sensor. The deployer's internal cable adjustment mechanism (bottom winch) allows the deployer's underwater height to be adjusted to align with the underwater instrument compartment. The deployer controls the fiber optic hydrophone array's attitude by adjusting the cable length, keeping the array horizontal underwater and adjusting the array's shape. Once the array is adjusted, the deployer's internal cable adjustment mechanism ceases operation, generating no noise and thus eliminating interference with the system's noise monitoring.

[0039] The size of the deployer is basically the same as that of the underwater instrument cabin, and the ocean current forces acting on both ends of the fiber optic hydrophone array are basically the same, which can enhance the stability of the array under the action of ocean currents.

[0040] like Figure 3 As shown, during deployment, the deploying vessel sequentially releases the deployer hook anchor, deployer, fiber-optic hydrophone array, surface communication buoy, and underwater instrument compartment. Given the high buoyancy of the underwater instrument compartment, the array's operating tension is insufficient to straighten the entire system, so the underwater instrument compartment remains largely above water during deployment. The deploying vessel then sails a distance with the gravity anchor and releases the compartment's moorings.

[0041] like Figure 4As shown, after the system is deployed, the deployer, underwater instrument compartment, mooring equipment, and hook anchor are fixed to the seafloor in a trapezoidal shape. The deployer is roughly the same size as the underwater instrument compartment, so the current forces acting on both ends of the array are roughly the same, enhancing the array's stability under currents. A depth pressure sensor is installed on the deployer. During system testing, the deployer's underwater height can be adjusted to align with the underwater instrument compartment by manually controlling the retraction and extension of the bottom winch. This allows the array's tail to be adjusted to align with the array's front.

[0042] like Figure 5 As shown, the force analysis and geometric analysis of the system are carried out when it is stable. The buoyancy of the underwater instrument cabin on the left is F1, the buoyancy of the deployer on the right is F2, and the tension on the array is F 拉 .

[0043] By analyzing the forces acting on the system when it is stable, we can calculate the buoyancy F of the instrument cabin and deployer against the ocean current:

[0044]

[0045] Where C is the resistance coefficient; ρ is the density of seawater; A is the area of the upstream surface, and v is the flow velocity.

[0046] Given the theoretical length S1 of the instrument cabin anchor rope and the adjustable theoretical length S2 of the deployer anchor rope, a geometric analysis was performed during the deployment of the system. Given a relatively flat deployment area, seafloor elevation differences can be disregarded. As the gravity anchor sinks, S1, S2, and the array length remain unchanged. Once the gravity anchor sinks, S2 is adjusted using the deployer's bottom winch to maintain the deployer at the same water depth as the instrument cabin.

[0047] Taking the deployment water depth H and the working water depth L as an example, we draw a simulation. The simulation shows that after the deployment vessel throws the gravity anchor, the instrument cabin drops almost vertically (with a deviation of about ±12m). Due to the long length of the array cable, no matter how far the gravity anchor falls back, the deployer is basically at the water depth H, and the gravity anchor falls back less than H. Figure 6 and 7 shown.

[0048] When the entire system is recovered, the cables at the bottom of the deployer and the underwater instrument cabin are cut, and the gravity anchor and hook anchor are released respectively. The deployer and the underwater instrument cabin can then float to the surface with the fiber optic hydrophone array, and the device can be recovered.

[0049] The beneficial effect of the present invention is that, compared with the existing technology, the present invention uses a deployer to retract and extend the photoelectric transmission cable and hook anchor to control the entire array to be level underwater and stabilize the array posture. When the array posture reaches the posture required for equipment testing, the deployer stops working. At this time, the equipment is in a silent state and does not generate any noise, thereby reducing the impact of noise generated by the equipment itself and effectively improving the working efficiency of the equipment.

[0050] The present invention solves the problems of the existing underwater buoy measurement system that the array attitude cannot be remotely adjusted and the self-noise is too large; it improves the long-distance measurement distance of underwater noise; and provides basic research data for the study of target noise characteristic evaluation methods.

[0051] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation plans of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, and is not a limitation on the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. An adjustable buoy noise measurement system, characterized in that: It includes underwater instrument cabin, optoelectronic transmission cable, fiber optic hydrophone array, deployer, mooring equipment, and surface communication buoy; The optical fiber transmission cable connects the underwater instrument cabin and the fiber optic hydrophone array. The fiber optic hydrophone array receives the noise signal radiated by the underwater target and transmits the signal to the underwater instrument cabin through the optical fiber transmission cable. The underwater instrument cabin is fixed to the seabed by a mooring device and connected to a surface communication buoy. The fiber-optic hydrophone array is connected to the deployer via an optoelectronic transmission cable. The deployer is fixed to the seabed by a hook anchor. The fiber-optic hydrophone array is adjusted by the deployer to achieve horizontal deployment. The underwater instrument cabin and deployer are positively buoyant structures, forming a trapezoidal structure underwater. The underwater instrument cabin includes a light source optical modulation and amplification sub-unit, an optoelectronic signal demodulation sub-unit, a data storage device, a power supply device, and the instrument cabin body. The optoelectronic signal demodulation sub-unit is used to perform optoelectronic signal demodulation processing on the noise signal radiated by the underwater target transmitted by the optoelectronic transmission cable. The light source optical modulation and amplification sub-unit transmits the prepared light source to the fiber optic hydrophone array through the optoelectronic transmission cable to provide input light for it. The deployer consists of a tail winch, a bottom winch, a battery compartment, a hook anchor, a float, and a frame; the tail winch is used to retract and extend the optoelectronic transmission cable at the tail of the fiber optic hydrophone array to straighten the array; the tail winch is equipped with a smooth ring, and the optoelectronic signal can be transmitted normally when the winch rotates; the bottom winch retracts and extends the hook anchor through the cable, and adjusts the depth of the deployer to keep it consistent with the height of the underwater instrument compartment, so that the entire array is level underwater.

2. The adjustable buoy noise measurement system according to claim 1, characterized in that: The mooring equipment consists of a gravity anchor and a claw anchor.

3. The adjustable buoy noise measurement system according to claim 1, characterized in that: The optoelectronic transmission cable adopts a flexible floating cable, which connects the underwater instrument cabin and the fiber optic hydrophone array through a watertight connector.

4. The adjustable buoy noise measurement system according to claim 1, characterized in that: A depth pressure sensor is installed on the deployer.

5. The adjustable buoy noise measurement system according to claim 1, characterized in that: The size of the deployer is comparable to that of the underwater instrument cabin, and the ocean current forces acting on both ends of the fiber optic hydrophone array are the same.

6. The adjustable buoy noise measurement system according to claim 1, characterized in that: When the system is deployed, the deploying vessel throws out the deployer hook anchor, deployer, fiber optic hydrophone array, surface communication buoy, and underwater instrument cabin in sequence; the deploying vessel sails a distance with the gravity anchor and then releases the underwater instrument cabin mooring equipment.

7. The adjustable buoy noise measurement system according to claim 1, characterized in that: When the system is recovered, the cables at the bottom of the deployer and the underwater instrument cabin are cut, and the gravity anchor and hook anchor are released respectively. The deployer and the underwater instrument cabin can then float to the surface with the fiber optic hydrophone array.

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