CN114275114B - Ship bottom bubble detection method and bubble layer monitor - Google Patents
Ship bottom bubble detection method and bubble layer monitor Download PDFInfo
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- CN114275114B CN114275114B CN202210001525.1A CN202210001525A CN114275114B CN 114275114 B CN114275114 B CN 114275114B CN 202210001525 A CN202210001525 A CN 202210001525A CN 114275114 B CN114275114 B CN 114275114B
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Abstract
The application provides a method for detecting bubbles at the bottom of a ship, which comprises the following steps: a predetermined number of mounting points are determined according to the structural configuration of the ship bottom, and an acoustic device is mounted at each mounting point. Based on the signals measured by the acoustic devices, a signal echo map at each acoustic device is obtained. And selecting a plurality of acoustic devices of which the signal echo diagrams meet the requirements as detection points, replacing the acoustic devices at the detection points with image acquisition devices, and setting the image acquisition devices in a conformal manner with the ship bottom. And acquiring the bubble thickness and the bubble distribution condition of the ship bottom based on each image acquisition device. Pushing the image acquisition equipment out of the ship bottom, and continuously acquiring the bubble thickness and the bubble distribution condition of the ship bottom. The distribution rule of ship bottom bubbles can be obtained according to the ship bottom bubble thickness and the bubble distribution condition, and the design basis of installing acoustic equipment at the bottom of the ship body is used as to find the optimal installation position of the suitable acoustic equipment, so that the normal use of the underwater acoustic equipment of the ship is ensured.
Description
Technical Field
The application relates to the technical field of ships, in particular to a detection method of ship bottom bubbles and a bubble layer monitor.
Background
The speed measurement principle of an acoustic log in acoustic equipment is that an energy transducer is adopted to transmit an acoustic pulse signal with a certain frequency to the seabed, and the ship motion parameter information is measured by detecting the time delay and the frequency difference (the so-called Doppler frequency shift phenomenon) between an echo signal and a transmitting signal.
When a large ship runs at a high speed, bubbles are generated or pass through some parts of the ship bottom. When a large amount of bubbles exist below the radiation surface of the transducer, the transmission and the reception of sound waves are blocked, and signals received by the acoustic log are not scattered from a designated water layer or the sea bottom, but are reflected from the bubble layer, so that the normal operation of the acoustic log is influenced.
Therefore, the condition of the flow field at the bottom of the ship body is known, normal use of the underwater acoustic equipment of the large ship can be guaranteed, and the underwater acoustic equipment has important significance on navigation safety. The method has the advantages that the sound field of the bubbles at the bottom of the ship body is measured, the distribution rule of the bubbles at the bottom of the ship body is found, the optimal installation position of the acoustic equipment is found, and the method has important significance on the navigation safety of the ship.
In view of the foregoing, it would be desirable to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
An object of the embodiment of the present application is to provide a method for detecting bottom bubbles, which can obtain a thickness of the bottom bubbles and a distribution condition of the bubbles, and can obtain a distribution rule of the bottom bubbles according to the thickness of the bottom bubbles and the distribution condition of the bubbles, and the obtained distribution rule of the bubbles is used as a design basis for installing acoustic equipment at the bottom of a hull.
The second aim of this application embodiment still lies in providing a bubble chamber layer monitor, utilizes the bubble chamber layer monitor to acquire hull bottom bubble thickness and bubble distribution condition.
In a first aspect, a method for detecting bubbles at the bottom of a ship is provided, which comprises the following steps:
s1, determining a preset number of mounting points according to the structural configuration of the ship bottom, and mounting acoustic equipment at each mounting point.
And S2, obtaining a signal echo map at each acoustic device based on the signals measured by the acoustic devices.
S3, selecting a plurality of acoustic devices with signal echo images meeting requirements as detection points, and replacing the acoustic devices at the detection points with image acquisition devices; the image acquisition equipment is arranged in a shape conforming to the ship bottom.
And S4, acquiring the bubble thickness and the bubble distribution condition of the ship bottom of the ship body in low-speed, medium-speed and high-speed states based on each image acquisition device.
And S5, pushing the image acquisition equipment out of the ship bottom, and continuously acquiring the bubble thickness and the bubble distribution condition of the ship bottom in a high-speed running state of the ship body.
In one embodiment, in step S3, the signal echo map meeting the requirement includes: the signal echo map has continuous stable echoes.
In one embodiment, the acoustic device comprises a transducer, and in step S3, replacing the acoustic device with an image acquisition device comprises: and taking out the transducer of the acoustic device and replacing the transducer with an image acquisition device.
In one embodiment, in step S3 and step S4, the distribution of the bubbles at least includes: the size and position of the bubbles and the vertical distribution of the bubble layer.
In one embodiment, in step S4, pushing the image capture device out of the bottom of the ship comprises: pushing the image acquisition equipment out of the ship bottom by 100-140mm.
In one embodiment, the image acquisition device comprises a plurality of depth modes.
In one embodiment, in step S1, said mounting an acoustic device at each of said mounting points comprises: and fixing the acoustic equipment at the mounting point by means of bonding. In one embodiment, the acoustic device is a noise sensor.
According to the second aspect of the application, still provide a bubble layer monitor, include:
the acoustic equipment is arranged on a mounting point of the ship bottom and used for acquiring a signal echo diagram; each of the acoustic devices includes a transducer.
And the image acquisition equipment is arranged at the acoustic equipment meeting the requirement and is used for replacing a transducer in the acoustic equipment so as to acquire the bubble thickness and the bubble distribution condition at the bottom of the ship.
The image acquisition device comprises a first state and a second state: the first state of the image acquisition equipment is that the image acquisition equipment is arranged in a conformal manner with the bottom of a ship; the second state of the image acquisition device is that the image acquisition device pushes out the ship bottom.
In one embodiment, the image capturing device comprises a sliding mechanism which in a first state conforms to the bottom of the ship, and in a second state is at a distance of 100-140mm from the bottom of the ship.
Compared with the prior art, the beneficial effect of this application is:
in the technical scheme of the application, through steps S1 to S4, a signal echo diagram of the ship bottom relevant position about the noise impedance condition is obtained, and after analysis is carried out according to the signal echo diagram, the ship bottom bubble thickness and the bubble distribution condition are obtained by using a bubble layer monitor. The distribution rule of the bottom bubbles can be obtained according to the thickness of the bottom bubbles and the distribution condition of the bubbles. The obtained distribution rule of the bubbles is used as a design basis for installing acoustic equipment at the bottom of the ship body so as to find the optimal installation position of the acoustic equipment, ensure the normal use of the underwater acoustic equipment of the ship, and have important significance on the navigation safety of the ship.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a flowchart illustrating a method for detecting bubbles at the bottom of a ship according to an embodiment of the present application;
FIG. 2 is a schematic view of the installation of the acoustic device of the method for detecting bubbles at the bottom of the ship in FIG. 1;
FIG. 3 is a schematic diagram of the structure of an acoustic device of the method for detecting bubbles at the bottom of the ship in FIG. 1;
FIG. 4 is a schematic structural diagram of an auxiliary mounting plate in the method for detecting bubbles at the bottom of a ship according to the embodiment of the present application;
fig. 5 is another schematic structural diagram of an auxiliary mounting plate in the method for detecting bubbles on the bottom of a ship according to the embodiment of the application;
fig. 6 is a front view of an acoustic device installed in a method for detecting bubbles on the bottom of a ship according to an embodiment of the present application;
fig. 7 is a left side view of an acoustic device installed in the method for detecting bubbles in the bottom of a ship according to the embodiment of the present application;
fig. 8 is a top view of an acoustic device installed in the detection method of bubbles at the bottom of a ship according to the embodiment of the present application;
FIG. 9 is a schematic diagram illustrating a first state of a bubble level monitor according to an embodiment of the present application;
fig. 10 is a schematic configuration diagram illustrating a second state of the bubble layer monitor according to the embodiment of the present application.
In the figure: 1. a first acoustic device; 2. a second acoustic device; 3. a third acoustic device; 4. a fourth acoustic device; 5. a fifth acoustic device; 6. a sixth acoustic device; 7. a seventh acoustic device; 8. an eighth acoustic device; 9. a transducer; 10. a fixed seat; 11. fastening a bolt; 12. an auxiliary mounting plate; 13. a noise measurement sensor; 14. connecting a cable; 15. a cable protection plate; 16. a protective sleeve; 17. a fastener; 18. increasing the neck; 19. a lens; 20. a light source; 21. a top plate; 22. a base plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
According to a first aspect of the present application, referring to fig. 1, there is first provided a method for detecting bubbles at the bottom of a ship, comprising the steps of:
s1, determining a preset number of mounting points according to the structural configuration of the ship bottom, and mounting acoustic equipment at each mounting point.
And S2, obtaining a signal echo diagram at each acoustic device based on the signals measured by the acoustic devices.
And S3, selecting a plurality of acoustic devices with signal echo diagrams meeting requirements as detection points, and replacing the acoustic devices at the detection points with image acquisition devices. The image acquisition equipment is arranged in a shape conforming to the ship bottom.
And S4, acquiring the bubble thickness and the bubble distribution condition of the ship bottom of the ship body in low-speed, medium-speed and high-speed states based on each image acquisition device.
In step S4, each image capturing device captures an image of the bubble thickness and the bubble distribution at the installation point, and the bubble thickness and the bubble distribution of the entire ship bottom are obtained based on each image.
It should be noted that the low speed state is achieved when the ship speed is less than 13 knots; the ship speed is in a medium speed state when the ship speed is 13-21 knots; when the ship speed is higher than 21 knots, the ship is in a high speed state.
And S5, pushing the image acquisition equipment out of the ship bottom, and continuously acquiring the bubble thickness and the bubble distribution condition of the ship bottom in a high-speed running state of the ship body.
Specifically, in step S5, the low speed, the medium speed, and the high speed are compared with the distribution of bubbles detected in the conformal mounting in step S4. The 14 pictures were taken fastest every second with model number AVTMANTA201B, with a time interval of 71.4ms between the two pictures.
If the navigation is less than 2 sections, the direction of the object moving in the water can be observed by combining the continuous pictures into the video, and if the speed is exceeded and the object moving range is beyond the window range, only a transient scene can be observed. At the time interval of 71.4ms, when the ship speed is 1 section, the object moving distance is 3.67cm, when 2 sections, the object moving distance is about 7.34cm, the diameter of the window circle is 8cm, the speed can be judged to be higher than 2 sections, and the motion track of the object cannot be analyzed. If the motion trajectory of the object needs to be known in a state of 20 knots or more at a high speed, at least 10000 high-speed cameras need to be shot for detection. Therefore, step S5 is only done to detect and describe the transient image of the bubble at high speed.
According to the detection method for the ship bottom bubbles, through the steps S1 to S4, a signal echo diagram of the ship bottom relevant position about the noise impedance condition is obtained, and after analysis is carried out according to the signal echo diagram, the thickness of the ship bottom bubbles and the bubble distribution condition are obtained by using a bubble layer monitor. The distribution rule of the bottom bubbles can be obtained according to the thickness of the bottom bubbles and the distribution condition of the bubbles. The obtained distribution rule of the bubbles is used as a design basis for installing the acoustic equipment at the bottom of the ship body so as to find the optimal installation position of the acoustic equipment, ensure the normal use of the underwater acoustic equipment of the ship, and have important significance on the navigation safety of the ship.
Referring to fig. 2, in step S1, the predetermined number of installation points is determined according to the structural scale of the ship bottom, specifically, including a first acoustic device 1, a second acoustic device 2, a third acoustic device 3, a fourth acoustic device 4, a fifth acoustic device 5, a sixth acoustic device 6, a seventh acoustic device 7, and an eighth acoustic device 8. As shown in fig. 3, each acoustic device comprises a transducer 9 and a holder 10. After determining the predetermined number of mounting points, the mounting points are numbered in order from front to back, left to right.
Specifically, the first acoustic device 1 is located on the left side of an outer panel of a cabin, and the sixth acoustic device 6 is disposed symmetrically to the first acoustic device 1. The second acoustic device 2, the third acoustic device 3 and the fourth acoustic device 4 are positioned in the left front of an opening of an underwater acoustic device in a ship bottom cabin, and are No. 2, no. 3 and No. 4 in sequence from outside to inside, as shown in FIG. 1. The seventh acoustic device 7 is symmetrical to the fourth acoustic device 4. The eighth acoustic device 8 is about 0.4 meters directly behind the orifice of a particular underwater acoustic device.
And four 'pen-shaped' wave beams forming certain included angles with the horizontal plane are respectively pointed to the front lower part, the rear lower part, the left lower part and the right lower part through the transducer. The method comprises the steps of transmitting a small-open-angle sound pulse signal with a certain frequency to water through a 'pen-shaped' wave beam, and processing the difference between an echo signal and a transmitting signal received from each wave beam direction.
In the process of high-speed running of a large ship, bubbles are generated or pass through some parts of the ship bottom, and the bubbles mainly comprise 'cavitation bubbles' and 'forward bubbles'. "cavitation bubbles" refers primarily to cavitation caused by high velocity flowing fluids. The "bubble ahead" is a part of bubbles generated by turbulence generated by the bow chop waves or wave flow near the bow during the course of the ship's voyage, which are bubbles generated instantaneously when the ship is sailing at high speed, and another part of bubbles which have been generated in advance and are entrained by the flow near the hull or by drag force generated by the high-speed forward movement of the hull.
When a large number of bubbles are present below the radiating surface of the transducer, the transmission and reception of sound waves is blocked.
In one embodiment, in step S3, the signal echo map satisfying the requirement includes: the signal echo diagram has continuous stable echoes, which indicates that no bubble is blocked in the beam direction at the installation point of the signal echo diagram, and the signal echo diagram can be selected as a detection point. If continuous burrs appear on the submarine echoes in the signal echo diagram, indicating that continuous bubbles flow through the radiation surface of the installation point where the signal echo diagram is located, and bubbles exist in the beam direction of the installation point where the signal echo diagram is located, the installation point cannot be used as a detection point.
Specifically, when the ship moves straight at 16 knots, the ripples measured by each acoustic device are basically consistent in a signal echo network diagram measured by 8 acoustic devices, and the sea bottom echo is clear and visible. Indicating that the beam direction of each acoustic device is free from a large number of bubbles at this time.
When the ship speed is increased to about 24 knots, the seabed echoes measured by some acoustic equipment are clearly visible and are consistent with those at low speed, and therefore the situation that no bubbles are blocked in the beam direction is shown. And the signal envelopes measured by other acoustic devices are obviously changed, the scattering intensity is increased, and the beam direction of the acoustic device is not blocked by a bubble layer.
The symmetrically installed acoustic equipment travels straight at different speeds, and the envelope curves of the received signals are basically consistent.
The first acoustic device 1, the fourth acoustic device 4, and the eighth acoustic device 8 cannot see continuous and stable seafloor echoes at medium and high speed, which indicates that the first acoustic device 1, the fourth acoustic device 4, and the eighth acoustic device 8 all have bubble influence in the beam direction, and are not suitable for mounting the acoustic devices.
In an embodiment, referring to fig. 3, the acoustic device comprises a transducer 9, and in step S3, the acoustic device is replaced with an image acquisition device comprising: the transducer 9 of the acoustic device is removed and replaced by an image acquisition device.
In one embodiment, in step S3 and step S4, the distribution of the bubbles at least includes: the size and position of the bubbles and the vertical distribution of the bubble layer.
In one embodiment, pushing the image capture device out of the bottom of the ship in step S4 comprises: pushing the image acquisition equipment out of the ship bottom by 100-140mm.
In one embodiment, the image acquisition device includes a plurality of depth modes.
It should be noted that the image capturing device includes three depth modes: 01 mode, 05 mode, and 09 mode. The depth of field range of the 01 mode is 0-2cm, the depth of field range of the 05 mode is 4-6cm, and the depth of field range of the 09 mode is 8-10cm. Other parameter settings of the image acquisition device include at least: the exposure time and gain use default values.
In one embodiment, in step S3 and step S4, when acquiring the bubble thickness and the bubble distribution, the navigation parameters of each image capturing device in different depth-of-field modes need to be recorded at the same time. The navigation parameters at least include: speed, sailing attitude of the hull, and time.
It should be noted that the sailing posture of the hull at least includes: straight, left turn, right turn.
In one embodiment, after the bubble thickness and the bubble distribution are obtained in step S3 and step S4, the pictures or videos collected by the image capturing device need to be named and stored.
In one embodiment, mounting an acoustic device at each of the mounting points comprises: the acoustic device is secured to the mounting point by means of adhesive. Meanwhile, a connecting cable of the acoustic equipment is connected with a power supply or an electric cabinet in the cabin.
In one embodiment, referring to fig. 4 and 5, the auxiliary mounting plate 12 is adhered to the bottom of the acoustic device by a polymer epoxy adhesive, and the auxiliary mounting plate 12 is fixed to the bottom of the hull by spot welding. Two fastening bolts 11 are welded to the auxiliary mounting plate 12, and the two fastening bolts 11 are provided at the end of the acoustic device. The connecting cable 14 of the acoustic device passes between the two fastening bolts 11. Considering that the impact force of the water flow at the bottom of the test ship is very large when the test ship sails, the connecting cable of the acoustic equipment is thin, and the impact resistance is poor, the sensor and the cable need to be firmly fixed on the ship body, and the influence on the ship body is ensured to be minimized.
Specifically, two stainless steel bolts of M6 × 20 specification are welded on the auxiliary mounting plate 12 as the fastening bolts 11, the heads of the fastening bolts 11 are welded with the auxiliary mounting plate 12, and the height of the fillet is 3mm.
The auxiliary attachment plate 12 is a circular plate, as shown in fig. 4. Alternatively, the auxiliary mounting plate 12 is provided as an elliptical plate, as shown in fig. 5. Since the auxiliary mounting plate 12 is small, a polymer adhesive can be used in a room under the condition that the temperature requirement is satisfied. The auxiliary mounting plate 12 is then fixed to the hull bottom by spot welding.
In one embodiment, as shown in fig. 6 to 8, cable protection plates 15 are mounted on the two fastening bolts 11, the cable protection plates 15 are concave plates, and the connection cables 14 are arranged inside the concave surfaces of the concave plates. Both ends of the cable protection plate 15 are fixedly mounted with the fastening bolts 11 so that the connection cable 14 is pressed between the cable protection plate 15 and the auxiliary mounting plate 12. Considering that the connecting cable of the acoustic equipment is most easy to break, a special fixed protection mode is adopted. Due to the fact that the high-molecular adhesive cannot be used due to temperature, the situation that the connecting cable 14 is damaged due to the fact that impact force of water flow is too large is prevented through the arrangement of the cable protection plate 15, and the acoustic equipment can be firmly fixed at the bottom of a ship in different underwater flow fields during the navigation of the ship.
In one embodiment, the cable protection plate 15 is detachably and fixedly connected to the fastening bolt 11 by a fastener 17 to facilitate the mounting and dismounting of the acoustic device.
In some special seas and seasons, the installation method of the spot welding cable protection plate 15 may also be adopted.
In one embodiment, a plastic protective jacket 16 is provided around the connection cable 14.
In one embodiment, the acoustic device is a noise sensor 13.
According to a second aspect of the present application, referring to fig. 9 and 10, there is also provided a bubble layer monitor comprising:
and each acoustic device is arranged on a mounting point of the ship bottom and is used for acquiring a signal echo diagram. As shown in fig. 3, each acoustic device comprises a transducer 9 and a holder 10.
The image acquisition equipment is arranged at the acoustic equipment meeting the requirement, is used for replacing the transducer 9 in the acoustic equipment, and can slide along the fixed seat 10 so as to acquire the thickness and the distribution condition of bubbles at the bottom of the ship.
The image acquisition device comprises a first state and a second state: referring to fig. 9, the first state of the image capturing device is that the image capturing device is disposed conformal to the bottom of the ship; referring to fig. 10, the second state of the image capturing device is the image capturing device pushed out of the ship bottom setting.
In one embodiment, referring to fig. 9 and 10, the image capturing device includes a lens and a sliding mechanism, the sliding mechanism is slidably connected in the fixing base 10 of the acoustic device, the lens 19 is disposed on top of the sliding mechanism, and the lens 19 slides together with the fixing base 10. The sliding mechanism is conformal with the bottom of the ship when in the first state, and the distance between the sliding mechanism and the bottom of the ship is 100-140mm when in the second state.
In one embodiment, the sliding mechanism includes a housing enclosed by a top plate 21, a bottom plate 22, and side plates.
The top plate 21 and the bottom plate 22 are transparent plates, and are made of PC glass, so that the lens can conveniently acquire pictures of bubble states. The bottom plate 22 is installed in conformity with the bottom of the ship, and the gaps and the screw holes are smoothed by silica gel.
The side plate is a light-tight plate, and the height of the side plate is 100-140mm.
The bottom of the fixed seat 10 is provided with a through hole, and the sliding mechanism extends out of the bottom of the boat along the through hole. The diameter of the top plate is larger than that of the through hole at the bottom of the fixed seat 10, so that the sliding mechanism is prevented from completely sliding out of the fixed seat 10.
In one embodiment, the lens 19 is covered with an elongated neck 18, and the elongated neck 18 protects the lens 19. The lens 19 is disposed at the bottom of the elongated neck 18, and the data line of the lens 19 extends from the top of the elongated neck 18. In use, the lens 19 can be taken out to adjust different depth of field modes.
In one embodiment, a first sponge strip is provided between the outer wall of the lens 19 and the inner wall of the elongated neck 18, and a second sponge strip is provided on the contact surface of the lens 19 and the top plate 21. Considering that the ship is difficult to shake, incline left and right or shake slightly in the sailing process, in order to solve the problem of vibration of the installation body, the lens 19 is prevented from colliding with the growth neck 18 or the top plate 21 so as to damage the lens 19; meanwhile, when the lens 19 can take pictures in 1/19608 seconds, no influence is caused.
In one embodiment, a ring-shaped light source 20 is arranged in the sliding mechanism, the light source 20 is arranged around the inner wall of the side plate, and the bottom surface of the light source 20 is an inclined surface, so that the photographing environment of the image acquisition device is considered to be optimized.
In one embodiment, a dryer is provided within the slide mechanism to prevent moisture within from affecting the lens 19.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A method for detecting bubbles at the bottom of a ship is characterized by comprising the following steps:
s1, determining a preset number of mounting points according to the structural structure of a ship bottom, and mounting acoustic equipment at each mounting point;
s2, obtaining a signal echo map at each acoustic device based on the signals measured by the acoustic devices;
s3, selecting a plurality of acoustic devices with signal echo diagrams meeting requirements as detection points, wherein the signal echo diagrams meet the requirements and comprise: the signal echo map has continuous stationary echoes; replacing the acoustic equipment at the detection point with image acquisition equipment; the image acquisition equipment is arranged in a shape conforming to the ship bottom;
s4, acquiring the bubble thickness and the bubble distribution condition of the ship bottom of the ship body in low-speed, medium-speed and high-speed states based on each image acquisition device;
s5, pushing the image acquisition equipment out of the ship bottom, and continuously acquiring the bubble thickness and the bubble distribution condition of the ship bottom of the ship body in a high-speed running state; the distribution situation at the air bubbles at least comprises the following steps: the size and position of the bubbles and the vertical distribution of the bubble layer.
2. The method for detecting bubbles on the bottom of a ship of claim 1, wherein the acoustic device comprises a transducer, and in step S3, replacing the acoustic device with an image acquisition device comprises: and taking out the transducer of the acoustic device and replacing the transducer with an image acquisition device.
3. The method for detecting bubbles at the bottom of a ship of claim 1, wherein pushing the image capturing device out of the bottom of a ship in step S5 comprises: pushing the image acquisition equipment out of the ship bottom by 100-140mm.
4. The method according to claim 3, wherein the image capturing device comprises a plurality of depth modes.
5. The method for detecting bubbles at the bottom of a ship of claim 4, wherein in step S1, said mounting an acoustic device at each of said mounting points comprises:
and fixing the acoustic equipment at the mounting point by means of bonding.
6. The method of detecting bilge bubbles of claim 5, wherein the acoustic device is a noise sensor.
7. A bubble layer monitor, which is applied to the method for detecting bubbles at the bottom of a ship according to any one of claims 1 to 6, comprising:
the acoustic equipment is arranged on a mounting point of the ship bottom and used for acquiring a signal echo diagram; each of the acoustic devices comprises a transducer;
the image acquisition equipment is arranged at the acoustic equipment meeting the requirement and is used for replacing a transducer in the acoustic equipment so as to acquire the bubble thickness and the bubble distribution condition at the bottom of the ship;
the image acquisition device comprises a first state and a second state: the first state of the image acquisition equipment is that the image acquisition equipment is arranged in a shape conforming to the ship bottom; the second state of the image acquisition device is that the image acquisition device pushes out the ship bottom.
8. A bubble layer monitor according to claim 7, wherein the image capturing device comprises a sliding mechanism which in a first state conforms to the bottom of the vessel, and in a second state is at a distance of 100-140mm from the bottom of the vessel.
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| CN112141290A (en) * | 2020-09-25 | 2020-12-29 | 哈尔滨工程大学 | Method for testing flow field or bubble field of ship model cross section |
| CN112455624A (en) * | 2020-12-03 | 2021-03-09 | 江南造船(集团)有限责任公司 | Mounting method of acoustic log |
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