Ship wake flow acoustic characteristic test platform for laboratory
By adjusting the height of the hydrophone and the reciprocating movement of the high-frequency acoustic signal transmitter, the error problem caused by the fixed water depth in traditional test platforms was solved, and stable and reliable testing of the acoustic characteristics of ship wake was achieved.
Patent Information
- Application Number
- CN202520198098.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-08
AI Technical Summary
In traditional ship wake acoustic characteristic testing platforms, the fixed water depth of hydrophones and high-frequency acoustic signal transmitters leads to large errors in test results and insufficient stability.
The design incorporates an adjustable hydrophone height and a reciprocating high-frequency acoustic signal transmitter, combined with a synchronous lifting mechanism, to ensure that the hydrophone covers multiple water layers and reduces eddy current interference, thereby achieving stable signal detection.
By expanding the longitudinal detection range, testing errors are reduced, thus improving the stability and accuracy of test results.
Smart Images
Figure CN223622625U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ship wake testing technology, and in particular to a laboratory test platform for the acoustic characteristics of ship wake. Background Technology
[0002] Currently known environmental changes caused by ship navigation involve nearly ten physical fields, including hot and cold wakes, biological effects, water pressure characteristics, and environmental density. Among these, vortex wakes are the most prominent feature. This is due to three main reasons: First, all the power required for underwater navigation by a 10,000-ton ship comes from the rotation of its propellers, resulting in enormous energy. Second, this immense energy is concentrated in the resulting seawater vortex structure, exhibiting a significant clustering effect. Third, due to the enormous energy and the clustering effect, the dissipation of this energy requires a relatively long time (approximately 1-3 hours). At a speed of 10 knots, 1-3 hours translates to a distance of 18-54 kilometers, which is of significant military strategic importance.
[0003] When a ship navigates underwater, the resulting vortex wake is inevitable and cannot be completely eliminated. Detecting and analyzing the vortex wake generated by a ship during underwater navigation allows for the detection of ships at any depth. To simulate the capture of a ship's vortex wake, current technologies use test platforms for experimental testing. Typically, a high-frequency acoustic signal transmitter emits a high-frequency acoustic signal, which is then monitored by hydrophones. As a ship model passes by, the waveform impact of the vortex wake on the acoustic signal is analyzed, thereby studying the capture of the ship's wake acoustic backscattering signals.
[0004] However, although traditional testing platforms have multiple hydrophones, they are all located at the same water depth. In order to cooperate with their use, the high-frequency acoustic signal transmitter is also located at a fixed water layer. In actual ship model navigation, it is difficult to control the fixed navigation depth, which can easily lead to weak acoustic signals monitored by hydrophones at fixed water depths, affecting the test results. Therefore, the error is large and the test is not stable enough. Utility Model Content
[0005] The purpose of this invention is to provide a laboratory ship wake acoustic characteristic testing platform to solve the problems of large errors and instability of the traditional testing platform. It has the advantages of a large monitoring depth range, reduced error generation, and more stable and reliable use.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A laboratory-grade ship wake acoustic characteristics testing platform includes an experimental pool, a ship model, a signal detection component, and a signal transmission component. When the ship model passes through the area between the signal detection component and the signal transmission component, the signal detection component detects the wake acoustic signal. The signal detection component is mounted on a first fixed frame, and the signal transmission component is mounted on a second fixed frame. The first and second fixed frames are mounted on a mounting frame and synchronously raised and lowered via a synchronous lifting mechanism. The mounting frame is fixed to the top of the experimental pool.
[0008] The signal detection component includes several hydrophones, and the height of multiple hydrophones can be adjusted by an adjustment device;
[0009] The signal transmitting component includes a high-frequency acoustic signal transmitter, which can move up and down repeatedly via a reciprocating motion device.
[0010] Preferably, the signal detection component includes a fixed plate, on which a first bracket and a second bracket are mounted. Each bracket is equipped with at least two hydrophones. The first bracket is raised and lowered by a first lifting cylinder, and the second bracket is raised and lowered by a second lifting cylinder.
[0011] Preferably, the first lifting cylinder and the second lifting cylinder are started synchronously, so that the lifting directions of the first bracket and the second bracket are opposite.
[0012] Preferably, the length of the first support is greater than the length of the second support.
[0013] Preferably, the signal transmitting assembly includes a sealed tube, a reciprocating screw is arranged along the length direction inside the sealed tube, a reciprocating slider is installed on the reciprocating screw, the reciprocating screw is driven to rotate by a reciprocating motor to make the reciprocating slider move up and down inside the sealed tube, a second magnet is installed on the reciprocating slider, and a first magnet is installed on the high-frequency sound signal transmitter. The high-frequency sound signal transmitter is attracted to the surface of the sealed tube at the position corresponding to the reciprocating slider by the magnetic attraction of the first magnet and the second magnet.
[0014] Preferably, the high-frequency acoustic signal transmitter includes an outer shell composed of an upper shell and a lower shell, with a transmitter installed inside the outer shell. The upper shell and the lower shell are symmetrically arranged conical structures, and guide grooves are formed in the upper shell and the lower shell along the moving direction of the high-frequency acoustic signal transmitter.
[0015] Preferably, both the first and second fixed frames include a base and a lifting screw. A synchronous lifting mechanism controls the lifting screw to drive the base to rise and fall. A guide rod parallel to the lifting screw is also installed on the base.
[0016] Preferably, the synchronous lifting mechanism includes a threaded seat threaded onto the lifting screw, the threaded seat is mounted on the mounting frame, the surface of the threaded seat is provided with teeth, two threaded seats are connected to a transmission belt to realize transmission, and a drive gear is also connected to the transmission belt, the drive gear is driven by the lifting motor.
[0017] Compared with the prior art, the present invention has the following beneficial effects:
[0018] 1. By adjusting the height of different hydrophones to distribute them across multiple water layers, and by using a high-frequency acoustic signal transmitter that moves up and down repeatedly in conjunction with the hydrophones, the detection range of vertical depth is increased, effectively reducing testing errors.
[0019] 2. The high-frequency acoustic signal transmitter in this utility model uses a reciprocating lead screw to indirectly drive the up and down movement. The high-frequency acoustic signal transmitter and the reciprocating slider are not in direct contact by magnetic attraction. The reciprocating slider and the reciprocating lead screw are in a sealed tube. In this way, the reciprocating lead screw will not generate eddies in the water tank when it rotates, thus avoiding affecting the test results. Moreover, the outer shell of the high-frequency acoustic signal transmitter is designed to have low water resistance, and it will not generate too many water waves when it moves back and forth. This satisfies the requirement of increasing the detection range without causing external interference. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of the testing platform of this utility model.
[0021] Figure 2 This is a schematic diagram of the signal detection component structure of this utility model.
[0022] Figure 3 This is a schematic diagram of the signal transmitting component structure of this utility model.
[0023] Figure 4 This is a schematic diagram of the outer shell structure of the high-frequency acoustic signal transmitter of this utility model.
[0024] Figure 5 This is a schematic diagram showing the location distribution of the hydrophone and high-frequency sound signal transmitter of this utility model.
[0025] Figure 6 This is a schematic diagram of the synchronous lifting mechanism of this utility model.
[0026] In the diagram: 1. Experimental pool, 2. Ship model, 3. Mounting frame, 4. Synchronous lifting mechanism, 5. First fixed frame, 6. Second fixed frame, 7. Signal detection component, 8. Signal transmission component, 9. Fixing plate, 10. Wiring harness, 11. First bracket, 12. Second bracket, 13. First lifting cylinder, 14. Second lifting cylinder, 15. Hydrophone, 16. Sealing tube, 17. High-frequency sound signal transmitter, 18. First magnet, 19. Second magnet, 20. Reciprocating slider, 21. Reciprocating lead screw, 22. Bearing seat, 23. Reciprocating motor, 24. Upper housing, 25. Lower housing, 26. Guide channel, 27. Transmission source, 28. Base, 29. Lifting lead screw, 30. Guide rod, 31. Threaded seat, 32. Transmission belt, 33. Drive gear, 34. Lifting motor. Detailed Implementation
[0027] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0028] like Figure 1 As shown, a laboratory-grade ship wake acoustic characteristic testing platform is disclosed, including an experimental pool 1, a ship model 2, a signal detection component 7, and a signal transmission component 8. The signal detection component 7 detects the wake acoustic signal when the ship model 2 passes through the area between the signal detection component 7 and the signal transmission component 8. The experimental pool 1 provides space for the ship model 2 to navigate, while the signal detection component 7 and the signal transmission component 8 are positioned opposite each other on the two side walls of the experimental pool 1. The ship model 2 will pass through the area between them during navigation. A high-frequency acoustic signal transmitter 17 within the signal transmission component 8 transmits high-frequency acoustic signals with a center frequency between several hundred kHz and several MHz. The acoustic signal is then captured by a hydrophone 15 within the signal detection component 7. Finally, the influence of the ship model 2's wake on the acoustic signal waveform is analyzed. Figure 5 As shown, the positions of the hydrophone 15 and the high-frequency sound signal transmitter 17 are relatively distributed to facilitate the signal capture of the hydrophone 15.
[0029] like Figure 1As shown, the signal detection component 7 is mounted on the first fixed frame 5, and the signal transmitting component 8 is mounted on the second fixed frame 6. The first fixed frame 5 and the second fixed frame 6 are mounted on the mounting frame 3 and are raised and lowered synchronously by the synchronous lifting mechanism 4. The mounting frame 3 is fixed to the top of the experimental pool 1. Since the wake of the ship model 2, the signal detection component 7, and the signal transmitting component 8 has a significant impact on the sound signal when they are at the same horizontal depth, and can accurately reflect the test results, the synchronous lifting mechanism 4 is set to control the synchronous position adjustment of the first fixed frame 5 and the second fixed frame 6. This adjustment method reduces the difficulty of worker operations and improves control accuracy. Moreover, the synchronous adjustment is also to ensure that the signal detection component 7 and the signal transmitting component 8 are on the same horizontal plane.
[0030] The above mentioned that the test results were optimal when the ship model 2, signal detection component 7, and signal transmission component 8 were at the same horizontal depth. Although the synchronous lifting mechanism 4 was used to control the signal detection component 7 and signal transmission component 8 to be at the same horizontal depth, the water depth of the ship model 2 could not be guaranteed to remain constant during navigation, resulting in errors due to vertical fluctuations. Therefore, as... Figure 1-3 As shown, the signal detection component 7 includes several hydrophones 15. The height of multiple hydrophones 15 can be adjusted by an adjustment device, which is used to adjust the horizontal depth of different hydrophones 15, so that they are longitudinally distributed across multiple water layers. The adjustment device is the lifting cylinder mentioned below. Because the hydrophones 15 are distributed across multiple water layers, even if the ship model 2 has some ups and downs, it will not affect the acquisition of sound signals. In order to cooperate with the signal acquisition of the hydrophones 15 with this increased range, the signal transmission component 8 also needs to be set accordingly. The signal transmission component 8 includes a high-frequency sound signal transmitter 17. The high-frequency sound signal transmitter 17 can move up and down repeatedly by a reciprocating motion device. The signal transmission component 8 uses the up and down reciprocating motion to continuously adjust the water depth position when the signal is emitted, thereby taking into account the sound signal emission on different water layers corresponding to the hydrophones 15, ensuring that the hydrophones 15 fully capture the signal. Therefore, by using this method of expanding the longitudinal monitoring range, the error of the ship model 2 during navigation can be effectively offset, ensuring the test results.
[0031] The following is a detailed description of the distribution adjustment of the hydrophone 15, such as... Figure 2As shown, the signal detection component 7 includes a fixed plate 9, on which a first bracket 11 and a second bracket 12 are mounted. Each bracket has at least two hydrophones 15 mounted on it. The first bracket 11 is raised and lowered by a first lifting cylinder 13, and the second bracket 12 is raised and lowered by a second lifting cylinder 14. The first and second brackets 11 and 12 divide the hydrophones 15 into two water layers. The multiple hydrophones 15 on each bracket also improve the lateral detection range. To increase the number of water layers, more hydrophones 15 can be placed on the first and second brackets 11 and 12. These hydrophones 15 can be fixed to the fixed plate 9 and do not need to move, thus achieving a three-layer distribution of the hydrophones 15 together with the first and second brackets 11 and 12. Each bracket is driven by a lifting cylinder to ensure independent movement of the two brackets. The first and second lifting cylinders 13 and 14 start synchronously, causing the first and second brackets 11 and 12 to move in opposite directions. This opposite movement direction of the two brackets also increases the spacing between the water layers of the hydrophones 15. The length of the first bracket 11 is greater than the length of the second bracket 12. This is to increase the lateral spacing of the hydrophones 15 so that they do not pile up. Since the hydrophones 15 need to be connected to cables, a cable bundle 10 is also installed on the mounting plate 9 to facilitate the aggregation of multiple cables.
[0032] Because the signal transmitting component 8 needs to move up and down reciprocally, in order to avoid stirring the surrounding water and creating eddies during the up-and-down movement, such as Figure 3 As shown, the signal transmitting assembly 8 includes a sealing tube 16, a reciprocating screw 21 is arranged along the length direction inside the sealing tube 16, a reciprocating slider 20 is installed on the reciprocating screw 21, the reciprocating screw 21 is driven to rotate by a reciprocating motor 23 to make the reciprocating slider 20 move up and down inside the sealing tube 16, a second magnet 19 is installed on the reciprocating slider 20, and a first magnet 18 is installed on the high-frequency sound signal transmitter 17. The high-frequency sound signal transmitter 17 is attracted to the surface of the sealing tube 16 at the position corresponding to the reciprocating slider 20 by the magnetic attraction of the first magnet 18 and the second magnet 19. Using the above design, the high-frequency acoustic signal transmitter 17 is not directly connected to the reciprocating motion device. Instead, it moves synchronously with the reciprocating slider 20 using magnetic attraction. Furthermore, the reciprocating slider 20 and the reciprocating lead screw 21 are located inside the sealing tube 16, which isolates the reciprocating motion device from the water. This way, even when the reciprocating slider 20 and the reciprocating lead screw 21 are working, they will not stir up the surrounding water and generate eddies. The two ends of the reciprocating lead screw 21 are mounted on the two ends of the sealing tube 16 through bearing seats 22, which is also to ensure that the rotation of the reciprocating lead screw 21 is smoother and to reduce the vibration generated by the sealing tube 16. All of the above structures are designed to ensure that the water waves generated when the reciprocating motion device driving the high-frequency acoustic signal transmitter 17 is working do not affect the signal capture of the signal detection component 7.
[0033] like Figure 4As shown, the high-frequency sound signal transmitter 17 includes an outer shell composed of an upper shell 24 and a lower shell 25. The transmitter 27 is installed inside the outer shell. The upper shell 24 and the lower shell 25 are symmetrically arranged conical structures. The upper shell 24 and the lower shell 25 are provided with guide grooves 26 along the moving direction of the high-frequency sound signal transmitter 17. As can be seen from the above, the high-frequency sound signal transmitter 17 needs to move up and down. In order to reduce the water resistance when the high-frequency sound signal transmitter 17 moves up and down, the outer shell is set to be a conical structure at both the upper and lower ends, which can reduce the resistance when moving up and down. The guide grooves 26 are also set to reduce water resistance.
[0034] like Figure 6 As shown, both the first fixed frame 5 and the second fixed frame 6 include a base 28 and a lifting screw 29. The synchronous lifting mechanism 4 controls the lifting screw 29 to drive the base 28 to rise and fall. A guide rod 30 parallel to the lifting screw 29 is also installed on the base 28. The first fixed frame 5 and the second fixed frame 6 choose the screw lifting control method, which can also accurately control the height of the signal detection component 7 and the signal transmission component 8. It is used in conjunction with the synchronous lifting mechanism 4. The synchronous lifting mechanism 4 includes a threaded seat 31 threaded onto the lifting screw 29. The threaded seat 31 is installed on the mounting frame 3. The surface of the threaded seat 31 is provided with teeth. The two threaded seats 31 are connected to the transmission belt 32 to realize transmission. The transmission belt 32 is also connected to the drive gear 33, which is driven by the lifting motor 34. The transmission belt 32 ensures that the two threaded seats 31 rotate synchronously. This effectively controls the rotation of the lifting screw 29 on the first fixed frame 5 and the second fixed frame 6, thereby controlling the synchronous rise and fall of the base 28. It is also convenient to control by a single lifting motor 34, reducing the control difficulty.
[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A laboratory-grade ship wake acoustic characteristics testing platform, comprising an experimental pool (1), a ship model (2), a signal detection component (7), and a signal transmission component (8), wherein the signal detection component (7) detects wake acoustic signals when the ship model (2) passes through the area between the signal detection component (7) and the signal transmission component (8), characterized in that, The signal detection component (7) is mounted on the first fixed frame (5), the signal transmission component (8) is mounted on the second fixed frame (6), the first fixed frame (5) and the second fixed frame (6) are mounted on the mounting frame (3) and are synchronously lifted by the synchronous lifting mechanism (4). The mounting frame (3) is fixed to the top of the experimental pool (1). The signal detection component (7) includes a plurality of hydrophones (15), and the height of the hydrophones (15) can be adjusted by an adjustment device; The signal transmitting component (8) includes a high-frequency acoustic signal transmitter (17), which can move up and down repeatedly via a reciprocating motion device.
2. The laboratory-grade ship wake acoustic characteristics testing platform according to claim 1, characterized in that, The signal detection component (7) includes a fixed plate (9), on which a first bracket (11) and a second bracket (12) are mounted. Each bracket is equipped with at least two hydrophones (15). The first bracket (11) is raised and lowered by a first lifting cylinder (13), and the second bracket (12) is raised and lowered by a second lifting cylinder (14).
3. The laboratory-grade ship wake acoustic characteristics testing platform according to claim 2, characterized in that, The first lifting cylinder (13) and the second lifting cylinder (14) are started synchronously, so that the lifting directions of the first bracket (11) and the second bracket (12) are opposite.
4. A laboratory-grade ship wake acoustic characteristics testing platform according to claim 2, characterized in that, The length of the first support (11) is greater than the length of the second support (12).
5. A laboratory-grade ship wake acoustic characteristics testing platform according to claim 1, characterized in that, The signal transmitting assembly (8) includes a sealing tube (16), a reciprocating screw (21) is arranged along the length direction inside the sealing tube (16), a reciprocating slider (20) is installed on the reciprocating screw (21), the reciprocating screw (21) is driven to rotate by a reciprocating motor (23) to make the reciprocating slider (20) move up and down inside the sealing tube (16), a second magnet (19) is installed on the reciprocating slider (20), and a first magnet (18) is installed on the high-frequency sound signal transmitter (17). The high-frequency sound signal transmitter (17) is attracted to the surface of the sealing tube (16) at the position corresponding to the reciprocating slider (20) by the magnetic attraction of the first magnet (18) and the second magnet (19).
6. A laboratory-grade ship wake acoustic characteristics testing platform according to claim 5, characterized in that, The high-frequency acoustic signal transmitter (17) includes an outer shell composed of an upper shell (24) and a lower shell (25). An emission source (27) is installed inside the outer shell. The upper shell (24) and the lower shell (25) are symmetrically arranged conical structures. The upper shell (24) and the lower shell (25) have guide grooves (26) along the moving direction of the high-frequency acoustic signal transmitter (17).
7. A laboratory-grade ship wake acoustic characteristics testing platform according to claim 1, characterized in that, The first fixed frame (5) and the second fixed frame (6) both include a base (28) and a lifting screw (29). The synchronous lifting mechanism (4) controls the lifting screw (29) to drive the base (28) to rise and fall. A guide rod (30) parallel to the lifting screw (29) is also installed on the base (28).
8. A laboratory-grade ship wake acoustic characteristics testing platform according to claim 7, characterized in that, The synchronous lifting mechanism (4) includes a threaded seat (31) threaded onto the lifting screw (29). The threaded seat (31) is mounted on the mounting bracket (3). The surface of the threaded seat (31) is provided with teeth. The two threaded seats (31) are connected to the transmission belt (32) to realize transmission. The transmission belt (32) is also connected to the drive gear (33), which is driven by the lifting motor (34).