Array protective cover, exhaust device and phase consistency detection method
By designing an array protective cover and exhaust device, combined with numerical analysis and model testing, the problem of high loss rate of hydrophones in a reduced pressure environment was solved, the performance of the hydrophones was protected from being affected in a reduced pressure environment, and the test cost was reduced.
Patent Information
- Application Number
- CN202510936726.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-30
AI Technical Summary
There is little research on the protection devices of hydrophone arrays in reduced pressure environments in the existing technology, which leads to a high loss rate of hydrophones and increased testing costs.
An array protective cover and exhaust device were designed. Combining numerical analysis and model experiments, a transparent protective cover and sealing structure were used, equipped with a fresh water circulation system, and phase consistency detection was performed to ensure that the measurement performance of the hydrophone was not affected in a reduced pressure environment.
It effectively reduces the loss rate of the hydrophone and the test cost, while protecting the performance of the hydrophone from being affected in a reduced pressure environment.
Smart Images
Figure CN120721201A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of experiment and testing technology, in particular to an array protective cover, an exhaust device and a phase consistency detection method. Background Art
[0002] Ship noise primarily consists of mechanical noise, propeller noise, and hydrodynamic noise. Once cavitation occurs, the underwater radiated noise rapidly increases by over 10 decibels, becoming the strongest noise source on board. To control ship cavitation noise, it is necessary to study the noise in various parts of the ship and propose control measures. In field environments, interference factors are numerous, and engineering measurements are complex. Currently, research on ship cavitation noise is primarily conducted in laboratory environments, such as cavitation water cylinders. To identify ship cavitation noise in the laboratory, a hydrophone array is required. The array typically consists of dozens of hydrophones arranged in a specific pattern.
[0003] To simulate actual ship navigation conditions, ship cavitation noise testing requires a reduced pressure environment. While current hydrophones, both domestic and international, are resistant to high pressure, their ability to withstand negative pressure is limited. During laboratory measurements, the hydrophone array is placed directly in a reduced pressure environment, severely impacting its performance and requiring regular replacement, significantly increasing testing costs. To reduce hydrophone wear, numerical analysis and phase consistency studies are needed to protect the array without compromising its measurement performance.
[0004] There are few studies on the existing protection devices for sound source identification arrays, especially for underwater noise source identification arrays, especially for noise measurement in a decompression environment.
[0005] To this end, we propose an array protection cover, an exhaust device and a phase consistency detection method.
[0006] Application Contents
[0007] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides an array protective cover, an exhaust device and a phase consistency detection method, thereby effectively protecting the array hydrophone in a reduced pressure environment without affecting the measurement performance of the hydrophone array, greatly reducing the hydrophone loss rate and reducing testing costs.
[0008] The technical solutions adopted in this application are as follows:
[0009] An array protection cover, comprising:
[0010] Mounting seat;
[0011] A transparent protective cover is sealed and connected to the mounting seat, and a mounting cavity is formed between the transparent protective cover and the mounting seat;
[0012] Hydrophone, set and installed in the cavity;
[0013] The mounting seat is provided with a cylindrical hole, the terminal of the hydrophone is inserted into the cylindrical hole, a first O-ring is nested in the middle of the terminal of the hydrophone, and the tail of the terminal of the hydrophone is fixed on the mounting seat; the mounting cavity is filled with fresh water.
[0014] It is further characterized by:
[0015] The relative air content of the fresh water is less than 0.85.
[0016] The transparent protective cover is sealed and connected to the mounting seat via a hexagon socket screw, a flat washer, an elastic washer and a first hexagon nut.
[0017] The top of the transparent protective cover is semicircular, and the two sides are rectangular.
[0018] The gap between the tail end of the hydrophone terminal and the cylindrical hole of the mounting seat is filled with silica gel, and the tail end of the hydrophone terminal is fixed to the mounting seat by a locking screw sleeve.
[0019] A second O-ring is embedded in the connection between the mounting seat and the transparent protective cover.
[0020] The present application also discloses an exhaust device, comprising:
[0021] A water pump is provided with water inlet and outlet holes on both sides of the transparent protective cover. The water outlet of the water pump is connected to the water inlet hole. The water pump injects fresh water into the installation cavity of the array protective cover through the water inlet hole, so that the fresh water in the installation cavity of the array protective cover circulates and discharges all bubbles in the installation cavity.
[0022] After all bubbles are exhausted from the installation cavity, the water inlet and outlet holes are sealed with plastic screws and then tightened with a second hexagonal nut.
[0023] This application also discloses a phase consistency detection method, comprising the following steps:
[0024] Establish a standard sound source calibration system;
[0025] The array protective cover is suspended in the anechoic pool; the hydrophone in the array protective cover is electrically connected to the data acquisition system;
[0026] The standard sound source calibration system transmits a white noise signal with a fixed amplitude, and uses the hydrophone in the array protection cover to receive the signal. The data acquisition system collects the signal from the hydrophone.
[0027] Acoustic signal processing technology is used to detect the phase consistency of the signals received by different hydrophones in the array protective cover. If the phase difference of the signals received by hydrophones at different positions is greater than 2°, phase correction is required.
[0028] The standard sound source calibration system includes a signal amplifier, a narrowband filter, a power amplifier, and a high-frequency sound source that are electrically connected in sequence.
[0029] The beneficial effects of this application are as follows:
[0030] This application features a compact, rational structure and easy operation. By combining numerical analysis with model testing to design the array protective cover's shape, it effectively reduces its impact on the array's sound source identification performance. The design is rational, with excellent pressure-resistant sealing performance, and a pressure range of 30kPa-400kPa, effectively protecting the hydrophone array in reduced-pressure environments. This effectively protects the array hydrophone in reduced-pressure environments without compromising its measurement performance, significantly reducing hydrophone loss and testing costs.
[0031] At the same time, this application also has the following advantages:
[0032] (1) Fresh water is injected into the mounting cavity of the array protective cover through the exhaust device, and all air in the mounting cavity of the array protective cover is exhausted. The relative air content of the fresh water is less than 0.85, so that one end of the hydrophone is completely in fresh water, which is convenient for consistency testing.
[0033] (2) Acoustic signal processing technology is used to detect the phase consistency of the signals received by different hydrophones in the array protective cover. If the phase difference of the signals received by hydrophone 1 at different positions is greater than 2°, phase correction is required. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 This is a cross-sectional schematic diagram of the array protection cover of this application.
[0035] Figure 2 This is a side view of the array protection cover of this application.
[0036] Figure 3 Schematic diagram of the standard sound source calibration system for this application.
[0037] Figure 4 This is a schematic diagram of the phase consistency correction of this application.
[0038] Figure 5 This is a comparison chart of the signals received by different hydrophones in this application.
[0039] Among them: 1. Hydrophone; 2. Transparent protective cover; 3. Hexagon socket screw; 4. Flat washer; 5. Elastic washer; 6. First hexagonal nut; 7. Mounting seat; 8. Locking screw; 9. First O-ring; 10. Second O-ring; 11. Silicone; 12. Fresh water; 13. Water inlet; 14. Water outlet; 15. Second hexagonal nut. DETAILED DESCRIPTION
[0040] The specific implementation of this application is described below with reference to the accompanying drawings.
[0041] like Figure 1-Figure 2 As shown, the array protective cover includes a hydrophone 1, a transparent protective cover 2, and a mounting base 7. Mounting base 7 is provided with a cylindrical hole, into which the terminal of hydrophone 1 is inserted. A first O-ring 9 is nested in the middle of the terminal of hydrophone 1 to ensure sealing. The tail end of the terminal of hydrophone 1 is fixed to mounting base 7 via a locking screw 8.
[0042] The gap between the tail end of the hydrophone 1 and the cylindrical hole of the mounting base 7 is filled with silica gel 11 .
[0043] The transparent protective cover 2 is sealedly connected to the mounting base 7, and a mounting cavity is formed between the transparent protective cover 2 and the mounting base 7. The hydrophone 1 is arranged in the mounting cavity. The mounting cavity is filled with fresh water 12.
[0044] Specifically, the transparent protective cover 2 is sealedly connected to the mounting base 7 through a hexagon socket screw 3 , a flat washer 4 , an elastic washer 5 and a first hexagon nut 6 .
[0045] In one embodiment, an array sound-transparent protective cover is designed based on the array form of the hydrophone 1 and the finite element method. During the numerical simulation, the sound source is placed inside the protective cover, and the sound radiation performance at a distance of 1 m from the sound source is analyzed. It is best to radiate the sound wave in the form of a spherical wave. The top of the transparent protective cover 2 is semicircular and the two sides are rectangular.
[0046] A second O-ring 10 is embedded in the connection between the mounting seat 7 and the transparent protective cover 2 to increase the sealing performance.
[0047] In one embodiment, the transparent protective cover 2 is streamlined, providing a better acoustic testing environment.
[0048] In one embodiment, the transparent protective cover 2 is made of pressure-resistant material, which can reduce the impact of the transparent protective cover 2 on noise.
[0049] In one embodiment, the transparent protective cover 2 is made of a material with a high sound transmission coefficient.
[0050] Specifically, the transparent protective cover 2 is made of 6 mm thick organic glass material.
[0051] In one embodiment, the mounting seat 7 is made of 304 stainless steel.
[0052] In one embodiment, the mounting seat 7 is made of 25 mm thick organic glass material, and a cylindrical hole with a diameter of 7 mm is opened in the mounting seat 7 .
[0053] In one embodiment, the hexagon socket screw 3 , the flat washer 4 , the elastic washer 5 , and the first hexagon nut 6 are all made of 304 stainless steel.
[0054] In one embodiment, the fresh water 12 in the installation cavity needs to be degassed by a laboratory degassing system, and the relative air content of the fresh water 12 is less than 0.85.
[0055] In one embodiment, the dimensions of the hydrophone 1 are adapted according to the size of the array.
[0056] The present application also discloses an exhaust device for exhausting the installation cavity of the array protective cover. The exhaust device includes a water pump. Water inlet holes 13 and water outlet holes 14 are opened on both sides of the transparent protective cover 2. The water outlet of the water pump is connected to the water inlet holes 13. The water pump injects fresh water 12 into the installation cavity of the array protective cover through the water inlet holes 13, so that the fresh water 12 in the installation cavity of the array protective cover circulates until all bubbles are discharged and the fresh water 12 flows out from the water outlet holes 14. The water inlet holes 13 and the water outlet holes 14 are sealed by plastic screws and then locked by a second hexagonal nut 15.
[0057] like Figure 3-Figure 5 As shown, the present application also discloses a phase consistency detection method, comprising the following steps:
[0058] Establish a standard sound source calibration system;
[0059] The array protective cover is hung in the anechoic pool; the hydrophone 1 in the array protective cover is electrically connected to the data acquisition system;
[0060] The standard sound source calibration system transmits a white noise signal with a fixed amplitude, and uses the hydrophone 1 in the array protection cover to receive the signal, and the data acquisition system collects the signal of the hydrophone 1;
[0061] Acoustic signal processing technology is used to detect the phase consistency of the signals received by different hydrophones 1 in the array protective cover. If the phase difference of the signals received by hydrophones 1 at different positions is greater than 2°, phase correction is required.
[0062] like Figure 3 As shown, the standard sound source calibration system includes a signal amplifier, a narrowband filter, a power amplifier, and a high-frequency sound source that are electrically connected in sequence.
[0063] Specifically, the high-frequency sound source may be a spherical sound source.
[0064] The shape of the array protection cover was designed by combining numerical analysis with model testing, effectively reducing its impact on the array sound source identification performance. The structural design is reasonable, the pressure-resistant sealing performance is good, and the pressure-resistant range is 30kPa-400kPa, which can effectively protect the hydrophone 1 in a reduced pressure environment.
[0065] The present invention has a reasonable structure, clear manufacturing and operation procedures, and great engineering practical value. It can effectively protect the array hydrophone 1 in a reduced pressure environment without affecting the measurement performance of the hydrophone array 1, greatly reducing the loss rate of the hydrophone 1 and reducing testing costs.
[0066] The above description is an explanation of the present application, not a limitation of the present application. The scope of the present application is defined in the claims. Any form of modification may be made within the scope of protection of the present application.
Claims
1. An array protective cover, characterized in that: include: Mounting seat (7); The transparent protective cover (2) is sealed and connected to the mounting seat (7), and a mounting cavity is formed between the transparent protective cover (2) and the mounting seat (7); A hydrophone (1) is arranged and installed in the cavity; The mounting seat (7) is provided with a cylindrical hole, the connection terminal of the hydrophone (1) is inserted into the cylindrical hole, a first O-ring (9) is nested in the middle of the connection terminal of the hydrophone (1), and the tail of the connection terminal of the hydrophone (1) is fixed on the mounting seat (7); and the mounting cavity is filled with fresh water (12).
2. The array protective cover according to claim 1, wherein: The relative air content of the fresh water (12) is less than 0.
85.
3. The array protective cover according to claim 1, wherein: The transparent protective cover (2) is sealedly connected to the mounting seat (7) via a hexagon socket screw (3), a flat washer (4), an elastic washer (5) and a first hexagon nut (6).
4. The array protective cover according to claim 1, wherein: The top of the transparent protective cover (2) is semicircular, and the two sides are rectangular.
5. The array protective cover according to claim 1, wherein: The gap between the tail end of the hydrophone (1) and the cylindrical hole of the mounting seat (7) is filled with silica gel (11), and the tail end of the hydrophone (1) is fixed to the mounting seat (7) by a locking screw sleeve (8).
6. The array protective cover according to claim 1, wherein: A second O-ring (10) is embedded in the connection between the mounting seat (7) and the transparent protective cover (2).
7. An exhaust device, characterized in that: include: A water pump is provided with water inlet holes (13) and water outlet holes (14) on both sides of the transparent protective cover (2). The water outlet of the water pump is communicated with the water inlet holes (13). The water pump injects fresh water (12) into the installation cavity of the array protective cover through the water inlet holes (13), so that the fresh water (12) in the installation cavity of the array protective cover circulates and discharges all bubbles in the installation cavity.
8. An exhaust device according to claim 7, characterized in that: After all bubbles are exhausted from the installation cavity, the water inlet (13) and the water outlet (14) are sealed with plastic screws and then locked with a second hexagonal nut (15).
9. A phase consistency detection method, characterized in that: The steps include: Establish a standard sound source calibration system; The array protective cover according to any one of claims 1 to 6 is hung in an anechoic water pool; the hydrophone (1) in the array protective cover is electrically connected to a data acquisition system; The standard sound source calibration system transmits a white noise signal with a fixed amplitude, uses a hydrophone (1) in an array protection cover to receive the signal, and the data acquisition system collects the signal of the hydrophone (1); Acoustic signal processing technology is used to perform phase consistency detection on signals received by different hydrophones (1) in the array protective cover. If the phase difference of the signals received by hydrophones (1) at different positions is greater than 2°, phase correction is required.
10. The phase consistency detection method according to claim 9, wherein: The standard sound source calibration system includes a signal amplifier, a narrowband filter, a power amplifier, and a high-frequency sound source that are electrically connected in sequence.