Subarray core design of large-aperture underwater acoustic linear array
By designing the subarray core of large aperture water acoustic arrays, including compressive components and electromagnetic shielding network, the problem of the inability to achieve long arrays and cascades in the prior art is solved, and high precision, stability and multi-cascades are achieved Function to meet the array formation needs of large aperture arrays.
Patent Information
- Application Number
- CN202411419850.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-01-03
AI Technical Summary
The prior art cannot design a single large-aperture water acoustic array array with a length of more than 100 meters, making it difficult to meet the needs of large-aperture arrays of more than 100 meters, especially under the limitation of processing sites, which cannot achieve infinite cascaded sub-array core design.
A sub-array core of large aperture water sound line array is designed, including the head end connector, load bearing rope, depth sensor, hydrophone, electromagnetic shielding network, hydrophone signal amplification circuit board, internal conductors, and tube support. , dielectric oil, vibration-absorbing sponge, PU sheathing and crimp ring, adopts compressive components and double-ring crimp seal, combined with electromagnetic shielding and vibration-absorbing sponge to achieve high accuracy and stability, and meets large pore diameter through cascade function array formation requirements.
It achieves high detection accuracy and distance, resists water pressure, prevents seawater erosion, prevents electromagnetic interference, reduces water flow shock vibration, and is not restricted by production sites. It can realize multi-sub array cascade and meets the formation of large-scale line and large-aperture arrays. array requirements.
Smart Images
Figure CN119247334A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a sub-array core design of an underwater acoustic linear array, in particular to a sub-array core design of a large-aperture underwater acoustic linear array, and belongs to the field of underwater acoustic detection equipment. Background Art
[0002] Sound waves are the only substance known to mankind that can propagate over long distances in the ocean. Light and electromagnetic waves are quickly absorbed when propagating in the ocean. Sound waves can not only propagate over long distances in water, but also be reflected back when they encounter objects in the ocean. Sound waves of different frequencies are absorbed and emitted to different degrees in water. This characteristic makes sound waves an important means of underwater detection.
[0003] With the rapid development of underwater acoustic detection equipment and the continuous advancement of noise reduction technology, underwater detection technology is also moving towards the deep sea field with a wider range and greater depth. Underwater target detection equipment is also constantly developing. Among them, large-aperture underwater acoustic linear arrays refer to large underwater acoustic signal acquisition equipment composed of hundreds of hydrophone elements in a certain geometric shape (usually in a straight line), with a length ranging from hundreds of meters to several kilometers. With its high detection accuracy and distance, strong anti-interference ability, and stable and reliable testing technology, this equipment has become one of the most important military submarine exploration, resource exploration, and marine environment monitoring equipment. The large-aperture linear array converts the underwater acoustic signal into an electrical signal through low-noise electroacoustic conversion technology, and then realizes high-gain array signal extraction of weak ocean sound signals through large-scale array signal processing technology, thereby increasing the detection accuracy and distance and obtaining a large amount of useful ocean acoustic data.
[0004] The large-aperture linear array is composed of a long linear array containing multiple hydrophone elements. The array consists of a linear array core wrapped in a PU material sheath tube and filled with silicone oil. The difficulties in developing large-aperture linear arrays are: the array has long geometric dimensions, a large number of array elements, and is limited by the processing site. The existing domestic technology cannot achieve a single array length of more than 100 meters. Therefore, for large-aperture arrays of more than 100 meters, it is urgent to invent a sub-array core that can be infinitely cascaded to meet the design requirements of large-aperture arrays. Summary of the invention
[0005] In order to solve the above problems, the present invention provides a sub-array core design of a large-aperture underwater acoustic linear array, which has the characteristics of high detection accuracy and distance, water pressure resistance, seawater erosion resistance, electromagnetic interference resistance, reduced water flow impact vibration, stability and reliability, etc. At the same time, the mutual cascading function of the sub-array is taken into consideration to realize the formation requirements of the large-aperture array.
[0006] A sub-array core design of a large-aperture underwater acoustic linear array, the sub-array core is composed of a head-end connector, a load-bearing rope, a depth sensor, a hydrophone, an electromagnetic shielding net, a hydrophone signal amplification circuit board, an internal wire, a tube support, a dielectric oil, a vibration-damping sponge, a PU sheath tube, a buckle ring, etc. The hydrophone is the core component of the sub-array core. When designing, it is considered to select a relatively flat sensitivity response within the working frequency range and have a decoupling function with other structures in the array core to prevent affecting its acoustic characteristics. The array core includes components that are all pressure-resistant components of corresponding strength. The two ends of the array body are sealed with double rings, and there will be no problems of tube detachment and leakage. The oil filling holes of the connectors at both ends are sealed with a one-way valve, and the dielectric oil will not leak. The protective tube is made of PU material, has excellent wear resistance, can withstand long-term use and friction, and is not easy to wear and deform. The hydrophone is covered with 4 layers of electromagnetic shielding net. The amplifier board is placed in a sealed metal shell with a wire output to ensure electromagnetic shielding. The array core is completely wrapped with sponge to reduce the vibration influence between the protective tube and the support. The preamplifier module is one of the important components of the system. It is mainly responsible for amplifying and filtering the voltage output of the hydrophone that receives the sound signal, and outputting the preprocessed signal to the analog-to-digital conversion module in the cabin. The preamplifier module is placed in the hydrophone cavity and connected to the hydrophone output signal nearby. It has the following functions: improving the system signal-to-noise ratio, reducing the impact of external interference, and making reasonable layout to facilitate the adjustment of system gain, impedance conversion and matching. In the design of background field hydrophones, the preamplifier has a great influence on the detection of weak noise, and the preamplifier must have a high input impedance. The pipe support plays the role of supporting the PU sheath pipe in the array segment. The pressure-resistant skeleton is fixed to the load-bearing rope by bonding. A wire hole is opened in the middle of the pipe support to facilitate the passage of internal wires.
[0007] The beneficial effects of the present invention are: a sub-array core design of a large-aperture underwater acoustic linear array has the characteristics of high detection accuracy and distance, water pressure resistance, seawater erosion resistance, electromagnetic interference resistance, reduced water flow impact vibration, stability and reliability, etc. In addition, the design is not limited by the production site, and multiple sub-arrays can be cascaded to meet the array requirements of all large-scale linear and large-aperture arrays. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Attached Figure 1 It is a schematic diagram of the present invention.
[0009] 1 head connector, 2 load-bearing rope, 3 depth sensor, 4 hydrophone, 5 electromagnetic shielding net, 6 hydrophone signal amplification circuit board, 7 internal wire, 8 pipe support, 9 vibration damping sponge, 10 PU sheath tube, 11 dielectric silicone oil, 12 buckle ring, 13 tail connector DETAILED DESCRIPTION
[0010] The present invention is described below in conjunction with embodiments.
[0011] This embodiment designs a large-aperture hydrophone array with 40 hydrophones arranged at equal intervals of 7.5 meters. The large-aperture linear array is composed of 4 identical sub-arrays connected in series, each of which contains 10 hydrophones and other array components. Each sub-array is 75 meters long, and the total length of the large-aperture linear array is about 300 meters. The sub-array core structure is designed as follows: the sub-array core consists of 1 head end connector, 2 load-bearing ropes, 3 depth sensors, 4 hydrophones, 5 electromagnetic shielding nets, 6 hydrophone signal amplification circuit boards, 7 internal wires, 8 tube supports, 9 vibration-damping sponges, 10 PU sheath tubes, 11 dielectric silicone oil, 12 buckling rings, and 13 tail connectors. The sub-array size is a cylinder with an outer diameter of 62 mm and a length of 75 meters. All components in the array core are designed to withstand pressure, including 1 head connector, 3 depth sensor, 4 hydrophone, 6 hydrophone signal amplification circuit board, 8 tube support, and 13 tail connector. The pressure resistance is not less than 60Mpa, which can work at a depth of 6000 meters. 1 head connector and 13 tail connector can be plugged with other two-terminal arrays to form a cascaded large aperture array. 2 The role of the load-bearing rope is to fix the two ends on 1 head connector and 13 tail connector, fix various array components in the middle, and use 6 mm diameter aramid rope, which can provide more than 1.5 tons of load-bearing tension for the array core. 3 Depth sensor is fixed on 2 load-bearing rope, which is used to provide depth data for array deployment. 4 Hydrophone is the core component of the large aperture hydroacoustic array. This sub-array core is designed with a spacing of 7.5 meters between every two hydrophones, and a total of 10 hydrophones are deployed. Fix them on 2 load-bearing ropes. 5 The function of the electromagnetic shielding net is to ensure that the 4 hydrophones have sufficient electromagnetic shielding effect. This embodiment designs a four-layer electromagnetic shielding net to be sleeved on the outside of the 4 hydrophones. 6 The function of the hydrophone signal amplification circuit board is to amplify the weak signal received by the hydrophone and then transmit it out to ensure the quality of the signal and increase the anti-interference ability. 7 The internal wire is used to transmit the output signal of the 6 hydrophone signal amplification circuit board and the 3 depth sensor. 8 The tube support is filled inside the 10PU sheath tube. Because the 10PU sheath tube is a soft tube, it cannot be stably cylindrical when it is arrayed over a long distance. Therefore, a number of 4 tube supports with the same inner diameter as the 10PU sheath tube are fixed on the 2 load-bearing ropes at a spacing of about 1 meter to ensure that the 10PU sheath tube can maintain a cylindrical shape over a long distance. 9 The vibration-damping sponge is wrapped around the exposed part of the 2 load-bearing ropes to reduce the vibration intensity of the 2 load-bearing ropes. Finally, the two ends of the PU sheath tube 10 are fixed to the head end connector 1 and the tail end connector 13 by the buckling ring 12 to ensure the airtightness of the entire sub-array core, and then the inside of the PU sheath tube 10 is filled with 11 medium silicone oil to ensure the balance of internal and external pressures when the sub-array works in the deep sea.
Claims
1. A subarray core design for a large-aperture underwater acoustic linear array, the subarray core comprising (1) a head-end connector, (2) a load-bearing rope, (3) a depth sensor, (4) a hydrophone, (5) an electromagnetic shielding net, (6) a hydrophone signal amplification circuit board, (7) an internal wire, (8) a tube support, (9) a vibration-damping sponge, (10) a PU sheath tube, (11) a dielectric silicone oil, (12) a buckling ring, and (13) a tail-end connector.
2. A sub-array core design of a large aperture underwater acoustic linear array according to claim 1, characterized in that: The (1) head-end connector and (13) tail-end connector can be plugged into other two-terminal arrays to form a cascaded large-aperture array.
3. A sub-array core design of a large aperture underwater acoustic linear array according to claim 1, characterized in that: (5) The electromagnetic shielding net is composed of multiple layers of soft metal nets that are wrapped around the outside of the (4) hydrophone and are led out of the array core by (7) internal wires.
4. A subarray core design of a large aperture underwater acoustic linear array according to claim 1, characterized in that: A number of (8) pipe supports having the same inner diameter as that of the (10) PU sheath pipe are fixed on the (2) load-bearing rope at fixed intervals.