A submarine radiated noise measurement system and method considering vertical and horizontal reception

Abstract

The application discloses a radiation noise measuring system and method which can receive vertically and horizontally, and has horizontal receiving measuring mode and vertical receiving measuring mode, and comprises a main cable, branch cables, hydrophones, signal processing cabins (containing depth sensors), traction ropes, floating balls, counterweights, fixed cable rings and a set of dry end equipment; when the system is in the horizontal receiving measuring mode, the main cable is provided with a plurality of switching nodes at intervals along the length direction, the switching nodes are used for power supply and data transmission, and the switching nodes are connected through the main cable. The hydrophones and other structures in the device can be assembled and adjusted, so that the submarine radiation noise measuring task can be undertaken vertically or horizontally.

Description

Technical Field

[0001] This invention belongs to the field of underwater acoustic engineering technology, specifically relating to a submarine radiated noise measurement system and method that takes into account both vertical and horizontal reception. Background Technology

[0002] As a naval combat platform, a submarine is a highly complex noise source, not a point source in the traditional sense. Its noise is related to the various operating equipment, power, and propulsion systems within the submarine, as well as its installation method, structural vibration transmission mechanism, and magnitude. Therefore, a submarine forms a radiated noise field underwater that is distributed over time and space. Measuring and analyzing the underwater radiated noise and its directivity, gaining a deeper understanding of the spatial distribution law of underwater radiated noise, and obtaining more information about the underwater sound field are of great significance for studying the generation mechanism, characteristic control, and noise reduction of submarine underwater radiated sound fields.

[0003] Various systems exist for measuring submarine radiated noise, such as hydrophones, hydrophone arrays, horizontal arrays, and vertical arrays. Typical deployment methods include fixed on the seabed, floating, and towed behind a survey vessel. Among these, hydrophones are the most commonly used method for submarine radiated noise measurement due to their high sensitivity and the ability of multiple hydrophones arranged in an array to measure the spatial distribution of submarine radiated noise. The directivity of submarine underwater radiated noise can be categorized into vertical and horizontal directivity based on spatial location. Obtaining comprehensive and accurate noise directivity in both the vertical and horizontal planes in three-dimensional space is essential for evaluating its tactical advantages and weaknesses. Currently, most submarine radiated noise measurement systems are designed for specific measurement needs—vertical or horizontal reception—lacking versatility and efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a submarine radiated noise measurement system and method that takes into account both vertical and horizontal reception. By assembling and adjusting the hydrophone and other structures in the device, it can undertake the task of measuring submarine radiated noise with either vertical or horizontal reception.

[0005] The technical solution of this invention is to provide a submarine radiated noise measurement system that combines vertical and horizontal reception. The system has a horizontal reception measurement mode and a vertical reception measurement mode. The system includes a main cable, several branch cables, several hydrophones, several signal processing compartments (including depth sensors), several towing ropes, several buoys, several counterweights, several cable-fixing rings, and a set of trunk-end equipment. When the system is in horizontal reception measurement mode, it has the following structure:

[0006] Several transition nodes are spaced along the length of the main cable. The transition nodes are used for power supply and data transmission. The transition nodes are connected in series through the main cable (length M meters, to be determined according to design requirements). Any one of the transition nodes is connected to the trunk equipment through a bare cable (length to be determined according to design requirements).

[0007] Dry-end equipment (installed on shore or shipboard platform) is used to complete data processing and display control;

[0008] Each branch cable (length to be determined according to design requirements, recommended length 5-20 meters) is connected in series with a signal processing cabin and a hydrophone at the top. The hydrophone is also connected in series with a float above it via a traction rope to form a branch. Each branch is connected in parallel to the corresponding adapter node via a pluggable connector.

[0009] Each transition node is also equipped with a counterweight, which sits on the seabed and serves as an anchor.

[0010] The counterweight is equipped with a counterweight rope, and the lengths of the traction rope and counterweight rope can be adjusted according to the depth requirements of the hydrophones. This completes the horizontal receiving measurement objective, and the positions of each hydrophone on the horizontal plane can be arranged according to the experimental measurement requirements.

[0011] Preferably, when the system switches from horizontal receiving measurement mode to vertical receiving measurement mode, based on the connection relationship of the horizontal receiving measurement mode, the length of the traction rope on each branch is adjusted according to the depth requirements of each hydrophone in each vertical direction, so that the hydrophones are evenly distributed in the vertical direction, and the branches are bundled in the vertical direction by fixing cable rings. For better coordination, the traction rope of each branch can be connected to a large float (replacing the floats of each branch with a large integral float), and each transition node can be connected to a large counterweight (replacing the counterweights of each branch with a single integral counterweight) through a counterweight rope to form a force balance in the vertical direction; fixing cable rings are set at each hydrophone to bind the branches (traction rope, float, branch cable) together, and additional fixing cable rings can be added at the large float and large counterweight. Thus, the measurement arrangement of the vertical receiving measurement mode is completed.

[0012] Preferably, the adapter is a metal junction box with a built-in transmission circuit board.

[0013] Preferably, the float is made of plastic and has a traction rope binding point, which is connected to the hydrophone via the traction rope.

[0014] Preferably, the signal processing cabin shell is made of rust-resistant metal and has a built-in data processing circuit board (signal transmission and processing, power transmission) and a depth sensor; the signal processing cabin is connected to the hydrophone and branch cable respectively via pluggable connectors.

[0015] Preferably, each branch is connected in parallel to the corresponding adapter node via a pluggable connector.

[0016] Preferably, the cable fixing ring is made of lightweight and wear-resistant plastic material. The main ring has n snap-lock cable fixing holes at equal angles (360° / n) that can be opened or closed. The inner side is made of flexible rubber material. When opened, the cable (including: traction rope, branch cable, counterweight rope) is allowed to enter. When closed, the cable is pressed and fixed in the hole and cannot move.

[0017] Furthermore, the present invention also provides a method for using the above-mentioned submarine radiated noise measurement system that combines vertical and horizontal reception. When horizontal reception measurement is required, the system is set to horizontal reception measurement mode for measurement. When vertical reception measurement is required, the length of the traction rope on each branch is adjusted as needed to distribute the hydrophones at equal intervals in the vertical direction. The cable rings are then used to bundle the branches in the vertical direction, thereby switching to vertical reception measurement mode for measurement.

[0018] Compared with the prior art, the present invention has the following advantages after adopting the above solution:

[0019] 1. Composed of multiple hydrophones, the number of which can be increased or decreased to meet the requirements of submarine radiated noise measurement and is easy to implement in engineering; 2. Through simple assembly and adjustment of the hydrophones and other structures inside the device, it can undertake the task of measuring submarine radiated noise by vertical or horizontal reception. It is easy to adjust, highly versatile, and efficient in use. Attached Figure Description

[0020] Figure 1 This is a connection diagram of the horizontal receiving measurement mode of the present invention.

[0021] Figure 2 This is a connection diagram of the vertical receiving measurement mode of the present invention.

[0022] Figure 3 This is a schematic diagram of the cable-fixing ring structure of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] A submarine radiated noise measurement system that combines vertical and horizontal reception has two modes: horizontal reception measurement mode and vertical reception measurement mode. It mainly includes a main cable, several branch cables, several hydrophones, several signal processing compartments, several towing ropes, several buoys, several counterweights, several cable fixing rings, and a set of dry-end equipment.

[0025] When in horizontal receiving measurement mode, the connection structure is as follows.

[0026] Several transition nodes are spaced along the length of the main cable. The transition nodes are used for power supply and data transmission. The transition nodes are connected in series through the main cable (the length of which is determined according to design requirements). Any one of the transition nodes is connected to the trunk equipment through a bare cable section (the length of which is determined according to design requirements).

[0027] Dry-end equipment (installed on shore or shipboard platform) is used to complete data processing and display control;

[0028] Each branch cable (length to be determined according to design requirements, recommended length 5-20 meters) is connected in series with a signal processing cabin and a hydrophone at the top. The hydrophone is also connected in series with a float above it via a traction rope to form a branch. Each branch is connected in parallel to the corresponding adapter node via a pluggable connector.

[0029] Each transition node is also equipped with a counterweight, which sits on the seabed and serves as an anchor.

[0030] The counterweight is equipped with a counterweight rope, and the lengths of the traction rope and counterweight rope can be adjusted according to the depth requirements of the hydrophones. This completes the horizontal receiving measurement objective, and the positions of each hydrophone on the horizontal plane can be arranged according to the experimental measurement requirements.

[0031] Preferably, the transition node is a metal junction box with a built-in transmission circuit board. Each branch is connected in parallel to the transition node via a pluggable connector; a counterweight is connected to each transition node via a counterweight rope to create force balance with the float in the vertical direction, maintaining the stability of the hydrophone; the main cable is connected to the trunk equipment via a pluggable connector, and the hydrophones are arranged horizontally according to the test and measurement requirements, as detailed in [see details]. Figure 1 .

[0032] In addition, the float is made of plastic and has a traction rope binding point, which is connected to the hydrophone via the traction rope. The traction rope is Kevlar rope.

[0033] Preferably, the signal processing cabin is made of rust-resistant metal and houses a data processing circuit board (for signal transmission and processing, and power transmission) and a depth sensor. The signal processing cabin is connected to a hydrophone and a branch cable via pluggable connectors.

[0034] When the system needs to switch to vertical receiving measurement, such as Figure 2As shown, this embodiment uses four hydrophones. In actual use, the number can be increased or decreased according to the actual situation. Based on the horizontal receiving measurement mode connection relationship, the length of the traction rope on each branch is adjusted according to the depth requirements of each hydrophone in each vertical direction, so that the four hydrophones are evenly distributed in the vertical direction. The branches are then bundled together in the vertical direction using cable rings. For better coordination, the traction ropes of each branch can be connected to a large float, meaning that the floats of each branch are replaced with a large, integrated float. Similarly, each transition node is connected to a large counterweight via a counterweight rope, meaning that the counterweights of each branch are replaced with a single, integrated counterweight, forming a force balance in the vertical direction. Cable rings are set at each of the four hydrophones, meaning that multiple cable rings are set at intervals in the vertical direction to bind the branches (traction ropes, floats, branch cables) together. Additional cable rings can also be added at the large float and large counterweight to complete the measurement setup for the vertical receiving measurement mode.

[0035] Therefore, in terms of the composition of this system, a more preferred approach is to configure a large float among several floats, whose overall buoyancy is equivalent to the sum of the buoyancy of the other floats. Similarly, a large counterweight among several counterweights has an overall weight equivalent to the total weight of the other counterweights. Furthermore, the number of other floats besides the large float and the number of other counterweights besides the large counterweight are at least the same as the number of branches designed.

[0036] Among them, such as Figure 3 As shown, the cable fixing ring is made of lightweight and wear-resistant plastic material. The main ring has n snap-lock cable fixing holes at equal angles (360° / n) that can be opened or closed. The inner side is made of flexible rubber material. When opened, it allows the cable (including: traction rope, branch cable, counterweight rope) to enter. When closed, it binds and fixes the cable in the hole and prevents it from moving.

[0037] The method of use is as follows: when horizontal reception measurement is required, set it to horizontal reception measurement mode for measurement; when vertical reception measurement is required, adjust the length of the traction rope on each branch as needed to make each hydrophone equally spaced in the vertical direction, and use the cable ring to make each branch bundled in the vertical direction, thereby switching to the vertical reception measurement mode for measurement.

[0038] 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 submarine radiated noise measurement system that combines vertical and horizontal reception, characterized in that: The system has a horizontal receiving measurement mode and a vertical receiving measurement mode. The system includes a main cable, several branch cables, several hydrophones, several signal processing cabins, several traction ropes, several floats, several counterweights, several cable-fixing rings, and a set of trunk-end equipment. When the system is in horizontal receiving measurement mode, the connection structure is as follows. Several switching nodes are spaced along the length of the main cable. The switching nodes are used for power supply and data transmission. The switching nodes are connected in series through the main cable. Any one of the switching nodes is connected to the trunk equipment through a cable. Dry-end equipment is used to complete data processing and display control; Each branch cable is connected in series with a signal processing cabin and a hydrophone. The hydrophone is also connected in series with a float above it via a traction rope to form a branch. Each branch is connected in parallel to the corresponding junction node. Each transition node is also equipped with a counterweight, which sits on the seabed and serves as an anchor. The counterweight is equipped with a counterweight rope, and the length of the traction rope and the counterweight rope can be adjusted according to the depth requirements of the hydrophone. When the system switches from horizontal receiving measurement mode to vertical receiving measurement mode, the length of the traction rope on each branch is adjusted as needed to make each hydrophone equally spaced in the vertical direction, and the branches are bundled in the vertical direction by using cable fixing rings.

2. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: The adapter is a metal junction box with a built-in transmission circuit board.

3. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: The float is made of plastic and has a traction rope attachment point, which is connected to the hydrophone via the traction rope.

4. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: The signal processing cabin has a rust-resistant metal shell and contains a data processing circuit board and a depth sensor. The signal processing cabin is connected to a hydrophone and a branch cable via pluggable connectors.

5. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: Each branch is connected in parallel to the corresponding adapter node via a pluggable connector.

6. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: When the system switches from horizontal receiving measurement mode to vertical receiving measurement mode, the floats of each branch are replaced with a large-scale integral float, and the counterweights of each branch are replaced with an integral counterweight to form a force balance in the vertical direction.

7. The submarine radiated noise measurement system that combines vertical and horizontal reception according to claim 1, characterized in that: The cable fixing ring is made of lightweight and wear-resistant plastic. The main ring has a snap-lock cable fixing hole at an equal angle, which can be opened or closed. The inside is made of flexible rubber material. When opened, it allows the traction rope, branch cable and counterweight rope to pass through. When closed, it binds and fixes the branch cable in the hole and prevents it from moving.

8. A method of using a submarine radiated noise measurement system that combines vertical and horizontal reception as described in claim 1, characterized in that: When horizontal reception measurement is required, the measurement is performed in the horizontal reception measurement mode. When vertical reception measurement is required, the length of the traction rope on each branch is adjusted as needed to distribute the hydrophones at equal intervals in the vertical direction. The cable rings are then used to bundle the branches in the vertical direction, thereby switching to the vertical reception measurement mode.

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