WO2021029221A1 - 水中作業システム - Google Patents
水中作業システム Download PDFInfo
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- WO2021029221A1 WO2021029221A1 PCT/JP2020/029014 JP2020029014W WO2021029221A1 WO 2021029221 A1 WO2021029221 A1 WO 2021029221A1 JP 2020029014 W JP2020029014 W JP 2020029014W WO 2021029221 A1 WO2021029221 A1 WO 2021029221A1
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- WIPO (PCT)
- Prior art keywords
- pipeline
- diving machine
- submersible
- diving
- processing device
- Prior art date
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- 238000012545 processing Methods 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims abstract description 63
- 238000005259 measurement Methods 0.000 claims abstract description 60
- 230000009189 diving Effects 0.000 claims description 150
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 230000004044 response Effects 0.000 description 23
- 238000004891 communication Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000007689 inspection Methods 0.000 description 9
- 238000013459 approach Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
- B63C11/48—Means for searching for underwater objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B49/00—Arrangements of nautical instruments or navigational aids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/04—Systems determining presence of a target
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/42—Simultaneous measurement of distance and other co-ordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/74—Systems using reradiation of acoustic waves, e.g. IFF, i.e. identification of friend or foe
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/87—Combinations of sonar systems
- G01S15/876—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D1/00—Control of position, course, altitude or attitude of land, water, air or space vehicles, e.g. using automatic pilots
- G05D1/10—Simultaneous control of position or course in three dimensions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
- B63C7/26—Means for indicating the location of underwater objects, e.g. sunken vessels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
- B63G2008/002—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned
- B63G2008/004—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned autonomously operating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/39—Arrangements of sonic watch equipment, e.g. low-frequency, sonar
Definitions
- This application relates to an underwater work system that works underwater using a diving machine.
- the position of the diving machine is measured using an acoustic positioning system, but the measurement accuracy of the acoustic positioning system is not high.
- the pipeline laid on the bottom of the water moves over time due to tidal currents. Therefore, when the pipeline search work is performed using the submersible, the area where the pipeline is not laid may be searched, and the pipeline search work may take time.
- the present application has been made in view of the above circumstances, and an object of the present application is to provide an underwater work system capable of efficiently performing pipeline search work using a diving machine.
- the underwater work system of the present application uses a surface ship located on the water, a diving machine for searching for a pipeline laid on the bottom of the water, and sound waves output from an acoustic positioning device mounted on the surface ship.
- An acoustic positioning system for measuring the relative position of the diving machine with respect to the surface ship and a processing device are provided, and the processing device is relative to the surface ship from the acoustic positioning system at the start of the search operation.
- the position is acquired, the position of the diving machine is calculated based on the acquired relative position, and the measurement error area centered on the calculated position of the diving machine and the expected laying area of the pipeline extending in a predetermined direction.
- the presence or absence of the pipeline is displayed on the diving machine while crossing the expected laying area. Perform cross-sectional detection to detect.
- the pipeline search work is performed in consideration of the measurement error of the acoustic positioning system and the aging movement of the pipeline, so basically the pipeline can be searched by one crossing detection. Therefore, the pipeline search work can be efficiently performed.
- the underwater work system of the present application uses a surface ship located on the water, a diving machine for searching for a pipeline laid on the bottom of the water, and sound waves output from an acoustic positioning device mounted on the surface ship.
- the diving machine is provided with an acoustic positioning system and a processing device for measuring the relative position of the diving machine with respect to the surface ship by using the processing device from the acoustic positioning system to the surface ship at the start of the search operation.
- the relative position of the diving machine is acquired, the position of the diving machine is calculated based on the acquired relative position, and the measurement error region centered on the calculated position of the diving machine and the expected laying of the pipeline extending in a predetermined direction.
- the diving machine When the distance from the area is not a predetermined distance, the diving machine is moved to a position where the distance between the measurement error area and the expected laying area is the predetermined distance, and then the expected laying area is provided to the diving machine.
- Crossing detection may be performed to detect the presence or absence of the pipeline while crossing.
- cross-sectional detection is started from a position where the distance between the measurement error area and the expected laying area is a predetermined distance. Therefore, it is possible to find the pipeline more reliably than when the crossing detection is started from a position where the distance between the measurement error region and the expected laying region is narrower than a predetermined distance. In addition, unnecessary work is reduced as compared with the case where the crossing detection is started from a position where the distance between the measurement error area and the expected laying area is wider than a predetermined distance, and the search work can be performed efficiently.
- the underwater work system of the present application uses a surface ship located on the water, a diving machine for searching for a pipeline laid on the bottom of the water, and sound waves output from an acoustic positioning device mounted on the surface ship. It comprises an acoustic positioning system for measuring the relative position of the diving machine with respect to the surface ship and a processing device, the processing device of the pipeline extending in a predetermined direction to the diving machine in the search operation. While performing cross-sectional detection that detects the pipeline while crossing the expected laying area, the relative position of the diving machine with respect to the surface ship is acquired from the acoustic positioning system, and the diving machine is based on the acquired relative position.
- the traveling direction of the diving machine may be changed so that the diving machine may perform the crossing detection again.
- the underwater work system includes a surface vessel located on the water, a transponder dropped from the surface vessel to the bottom of the water, and a pipeline laid on the bottom of the water based on the dropped transponder. It is equipped with a submersible that performs search work to find out.
- pipeline search work is performed using a transponder. Since the transponder is less affected by the tidal current than the submersible when it is dropped, it can be dropped closer to the target position than the submersible. Therefore, according to the above configuration, the pipeline search work can be efficiently performed.
- FIG. 1 is a block diagram of an underwater work system according to the first embodiment.
- FIG. 2 is a flowchart of the search program of the first embodiment.
- FIG. 3 is a diagram showing the operation of the diving machine at the start of the search of the first embodiment.
- FIG. 4 is a diagram showing the operation of the diving machine when the pipeline cannot be detected.
- FIG. 5 is a block diagram of the underwater work system according to the second embodiment.
- FIG. 6 is a flowchart of the search program of the second embodiment.
- FIG. 7 is a diagram showing the operation of the diving machine at the start of the search of the second embodiment.
- FIG. 1 is a block diagram of the underwater work system 100 according to the present embodiment.
- the underwater work system 100 includes a surface vessel 10, a submersible 20, and an acoustic positioning system 40.
- position simply means an absolute position (position in the earth coordinate system).
- the surface vessel 10 is a maritime support vessel that navigates on the water and supports the submersible 20.
- the surface vessel 10 supplies electric power to the submersible 20 and stores data acquired by the submersible 20.
- the surface vessel 10 has a propulsion device 11, a GPS (Global Positioning System) device 12, an acoustic communication device 13, and a power feeding device 14. Further, the surface vessel 10 is provided with a processing device 15.
- the propulsion device 11 is a device that generates thrust for navigating on the water.
- the GPS device 12 is a device that acquires the position information of the surface ship 10 on the water.
- the acoustic communication device 13 is a device that communicates with the acoustic communication device 26 of the submersible 20 described later by using sound. The acoustic communication device 13 can acquire information acquired by each device of the diving machine 20 (for example, the remaining amount of the battery 25 of the diving machine 20) from the diving machine 20.
- the power supply device 14 is a device that supplies electric power to the power receiving device 24 of the diving machine 20, which will be described later.
- the submersible 20 approaches the surface vessel 10 and supplies electric power from the power supply device 14 of the surface vessel 10 to the power receiving device 24 of the submersible 20.
- the power supply device 14 may be a non-contact type power supply device that supplies electric power to the power receiving device 24 in a non-contact manner, and is a contact type that supplies electric power via a connector or the like that connects the surface vessel 10 and the submersible 20. It may be a power supply device.
- the diving vessel 20 is charged by the surface vessel 10, but a floating body is provided on the water or a charging station is provided on the seabed to provide the above-mentioned charging function of the surface vessel 10 and the like. It may be held so that the diving machine 20 is charged by a floating body or a charging station.
- the processing device 15 is a device that performs various processing such as controlling the entire surface vessel 10.
- the processing device 15 has a processor, a volatile memory, a non-volatile memory, an SSD, an I / O interface, and the like. Then, various control programs including a search program described later and various data are stored in the SSD, and after the non-volatile memory downloads various control programs from the SSD, the processor uses the volatile memory based on the various control programs. Perform arithmetic processing. Further, the processing device 15 is electrically connected to each device of the surface vessel 10 described above, acquires various information based on the measurement signals transmitted from each device, and calculates based on the information. And send a control signal to each device.
- the submersible 20 is an autonomous unmanned submersible that can navigate independently of the surface vessel 10, and can work underwater.
- the submersible 20 includes a propulsion device 21, an object detection device 22, an inspection device 23, a power receiving device 24, a battery 25, an acoustic communication device 26, an inertial navigation system 27, a depth meter 28, and a relative speed. It has a total of 29. Further, the diving machine 20 is provided with a processing device 30.
- the propulsion device 21 is a device that generates thrust for navigating underwater.
- the propulsion device 21 includes, for example, a main propulsion thruster for moving the diving machine 20 forward, a vertical thruster for moving the diving machine 20 in the vertical direction, a horizontal thruster for moving the diving machine 20 in the horizontal direction, and the like. Includes a plurality of propulsion units and a steering device that diverts the submersible 20.
- the propulsion device 21 is not limited to this, and may have, for example, a swing-type thruster capable of changing the direction in which thrust is generated.
- the object detection device 22 is a device that detects a pipeline that is a work object.
- the object detection device 22 of the present embodiment is a so-called multi-beam sonar.
- the object detection device 22 may be a shape grasping laser, or may be both a multi-beam sonar and a shape grasping laser.
- the position and number of object detection devices 22 are not particularly limited.
- the inspection device 23 is a device for inspecting the pipeline.
- the inspection device 23 of the present embodiment is an imaging camera (for example, a television camera) that images a pipeline.
- the inspection device 23 is an anticorrosion inspection device that inspects the degree of deterioration of the anticorrosion treatment (for example, anticorrosion coating) over the entire length of the pipeline, and corrosion, instead of the imaging camera or in addition to the imaging camera.
- One or both of the wall thickness inspectors for inspecting the wall thickness of the pipeline to inspect the degree of damage and the presence or absence of damage may be included.
- the power receiving device 24 is a device for receiving electric power supplied from the power feeding device 14 of the surface ship 10.
- the battery 25 is charged based on the electric power received by the power receiving device 24.
- the electric power stored in the battery 25 is used to operate each device of the diving machine 20 such as the propulsion device 21.
- the acoustic communication device 26 is a device that communicates with the acoustic communication device 13 of the surface ship 10 using sound.
- the acoustic communication device 26 can transmit information (for example, the remaining amount of the battery 25) acquired by various devices included in the diving machine 20 from the diving machine 20 to the surface ship 10.
- the inertial navigation system (INS) 27 is a device that measures the direction, position, and speed of the submersible 20 in the absolute coordinate system using an acceleration sensor and a gyro sensor.
- the depth meter 28 is a device that measures the depth of the diving machine 20.
- the relative speedometer 29 is a device that uses the Doppler effect to measure the relative moving direction and relative speed of the submersible 20 based on a fixed object such as the bottom of the water and a pipeline.
- the processing device 30 has a processor, a volatile memory, a non-volatile memory, an SSD, an I / O interface, and the like.
- the processing device 30 is electrically connected to each device of the diving machine 20 described above, acquires various information based on the measurement signals transmitted from each device, and performs calculations based on the information. , Send a control signal to each device.
- the acoustic positioning system 40 is a system for measuring the position of the diving vessel 20 with respect to the surface vessel 10 and measuring the position of the surface vessel 10 with respect to the diving vessel 20.
- the acoustic positioning system 40 of the present embodiment includes acoustic positioning devices 41 and 42 provided on the surface vessel 10 and the submersible 20, respectively, and response devices 43 and 44 provided on the surface vessel 10 and the submersible 20 respectively. ,have.
- the acoustic positioning device 41 of the surface vessel 10 may be integrally configured with the acoustic communication device 13 of the surface vessel 10.
- the acoustic positioning device 42 of the diving machine 20 may be integrally configured with the acoustic communication device 26 of the diving machine 20.
- the response device 44 that detects the sound wave sends a response wave (response signal) to the acoustic positioning device 41.
- the acoustic positioning device 41 can measure the relative position of the diving machine 20 with respect to the surface vessel 10 based on the response wave from the response device 44. Further, the processing device 15 of the surface vessel 10 acquires the relative position of the submersible 20 with respect to the surface vessel 10 from the acoustic positioning device 41, and based on the relative position and the position information of the surface vessel 10 acquired from the GPS device 12. , The position of the submersible 20 (apparent absolute position) can be calculated. Since the measurement by the acoustic positioning device 41 causes an error, the position of the diving machine 20 calculated here is just an apparent absolute position and is used for setting the measurement error region described later.
- the response device 43 that detects the sound wave sends a response wave (response signal) to the acoustic positioning device 42.
- the acoustic positioning device 42 can measure the relative position of the surface vessel 10 with respect to the submersible 20 based on the response wave from the response device 43.
- the processing device 30 of the submersible 20 acquires the relative position of the surface vessel 10 with respect to the submersible 20 from the acoustic positioning device 42, and the relative position and the acoustic. Based on the information acquired from the positioning device 42, the propulsion device 21 is driven so that the diving machine 20 approaches the surface vessel 10.
- the acoustic positioning system 40 in this embodiment employs a USBL (UltraShortBaseLine) type positioning system. That is, each of the acoustic positioning devices 41 and 42 has a transmitter and a receiving array, sends sound waves from the transmitter, and receives the response waves sent from the responding devices 43 and 44 that detect the sound waves in the receiving array. receive.
- the acoustic positioning devices 41 and 42 calculate the distance from the reciprocating time of the sound wave between the response devices 43 and 44 to the response devices 43 and 44, and the phase difference of the response waves arriving at each element in the receiving array.
- the orientations of the response devices 43 and 44 are specified based on the above.
- the acoustic positioning system 40 is not limited to the USBL type positioning system.
- the acoustic positioning devices 41 and 42 are provided with three or more receivers on each of the surface vessel 10 and the submersible 20 so as to be separated from each other, and the acoustic positioning devices are based on the arrival time difference of the response waves received by them.
- An SBL (Short Base Line) method for specifying the orientation of the response devices 43 and 44 in response to 41 and 42 may be adopted.
- the pipeline search work is performed before performing work such as inspection on the pipeline.
- the processing device 15 of the surface vessel 10 acquires various information from the processing device 30 of the diving machine 20 via the acoustic communication devices 13 and 26, and executes a search program based on the information.
- the processing device 15 of the surface vessel 10 performs various arithmetic processing in the search program, and transmits a control signal to the processing device 30 of the diving machine 20 via the acoustic communication devices 13 and 26.
- the processing device 30 of the diving machine 20 controls the propulsion device 21 and the like based on the received control signal.
- FIG. 2 is a flowchart of the search program.
- the search program shown in FIG. 2 is executed by the processing device 15 of the surface vessel 10.
- the search program is started when the submersible 20 is located at a predetermined height from the seabed.
- the processing device 15 sets the expected laying area of the pipeline (step S1).
- the "expected laying area" of a pipeline is the area where the pipeline may move over time.
- the processing device 15 of the present embodiment stores the laying position at the time when the pipeline is laid, and sets the laying position based on the memorized laying position and the elapsed period from the time of laying.
- FIG. 3 is a diagram showing the operation of the diving machine 20 in the search work.
- the two-dot chain line in FIG. 3 is the laying position of the pipeline at the beginning of laying, and the area sandwiched by the straight lines parallel to the two-dot chain line is the expected laying area of the pipeline.
- the expected laying area of the present embodiment is strip-shaped and extends linearly.
- the installation position of the pipeline at the time of laying is located in the center of the expected laying area. However, for example, when the pipeline is expected to move over time in only one direction, the pipeline at the time of laying The laying position will deviate from the center of the expected laying area.
- the processing device 15 calculates the position of the diving machine 20 (step S2).
- the position of the submersible 20 (apparent absolute position) is such that the processing device 15 obtains the position information of the surface vessel 10 acquired from the GPS device 12 and the submersible 20 with respect to the surface vessel 10 acquired from the acoustic positioning device 41. It can be calculated based on the relative position of.
- the processing device 15 sets the measurement error region of the surface vessel 10 (step S3).
- the “measurement error region” is a region in which the diving machine 20 may be located, and is a region centered on the position of the diving machine 20 calculated in step S2.
- the region surrounded by the circle with the reference numeral 20a is the measurement error region.
- the measurement error region increases as the distance between the surface vessel 10 and the submersible 20 increases. The distance between the surface vessel 10 and the submersible 20 can be estimated by the depth gauge 28.
- the processing device 15 determines whether or not the measurement error area of the surface vessel 10 and the expected laying area of the pipeline overlap (step S4).
- the processing device 15 determines that the measurement error area and the expected laying area overlap (YES in step S4)
- the processing device 15 moves the diving machine 20 to a position where those areas are separated (step S5).
- the measurement error area and the expected laying area overlap as shown by the circle with reference numeral 20a in FIG. 3
- the measurement error area and the expected laying area overlap as shown by the circle with reference numeral 20b.
- the submersible 20 is moved to a position where it disappears (see the submersible with reference numeral 20B in FIG. 3).
- cross-sectional detection described later is started (step S6).
- step S6 when the processing device 15 determines that the measurement error area and the expected laying area do not overlap (NO in step S4), the cross-sectional detection is started as it is (step S6).
- crossing detection is a work in which the submersible 20 detects the presence or absence of a pipeline while crossing the expected laying area.
- object detection device 22 of the diving machine 20 By using the object detection device 22 of the diving machine 20, it is possible to detect the presence or absence of a pipeline.
- the position of the diving machine 20 calculated by the processing device 15 moves from the position of the diving machine with the reference numeral 20B to the position of the diving machine with the reference numeral 20C. go.
- the processing device 15 determines whether or not the diving machine 20 has detected the pipeline (step S7). If it is determined that the submersible 20 has not detected the pipeline (NO in step S7), the crossing detection is continued (step S8). This crossing detection is repeated until the pipeline is detected. On the other hand, when it is determined that the diving machine 20 has detected the pipeline (YES in step S7), the search program ends, and the diving machine 20 starts the next work such as inspection of the pipeline.
- the underwater work system 100 is composed of a surface vessel 10 located on the water, a submersible 20 for searching for a pipeline laid on the bottom of the water, and an acoustic positioning device 41 mounted on the surface vessel 10. It includes an acoustic positioning system 40 that measures the relative position of the diving vessel 20 with respect to the surface vessel 10 using the output sound waves, and a processing device 15. Then, the processing device 15 acquires the relative position of the diving machine 20 with respect to the surface ship 10 from the acoustic positioning system 40 at the start of the search work, calculates the position of the diving machine 20 based on the acquired relative position, and calculates the diving.
- the diving machine 20 If the measurement error area centered on the position of the machine 20 and the expected laying area of the pipeline extending in a predetermined direction overlap, the diving machine 20 is moved to a position where the measurement error area and the expected laying area do not overlap. After that, the diving machine 20 is made to perform crossing detection to detect the presence or absence of the pipeline while crossing the expected laying area.
- the pipeline search work is performed in consideration of the measurement error of the acoustic positioning system 40 and the aged movement of the pipeline, basically, the crossing detection is performed once. You can find the pipeline. Therefore, the pipeline search work can be efficiently performed.
- the crossing detection is started from a position where the measurement error area and the expected laying area do not overlap, but the crossing is started from a position where the distance between the measurement error area and the expected laying area is a predetermined distance. Detection may be started. That is, the processing device 15 acquires the relative position of the diving machine 20 with respect to the surface ship 10 from the acoustic positioning system 40 at the start of the search work, calculates the position of the diving machine 20 based on the acquired relative position, and calculates the diving.
- the distance between the measurement error area centered on the position of the machine 20 and the expected laying area of the pipeline extending in a predetermined direction is not a predetermined distance, the distance between the measurement error area and the expected laying area becomes a predetermined distance.
- the diving machine 20 may be made to perform crossing detection for detecting the presence or absence of a pipeline while crossing the expected laying area.
- the pipeline can be basically found by one crossing detection, but if the pipeline cannot be found by one crossing detection, the pipeline can be found again.
- Crossover detection may be performed. For example, as shown by the circle with reference numeral 20d in FIG. 4, the diving machine 20 passes through the expected laying area, and the diving machine 20 moves to a position where the measurement error area and the expected laying area do not overlap. However, if the pipeline cannot be detected, the traveling direction of the diving machine 20 may be changed and the crossing detection may be performed again (see the diving machines with reference numerals 20E and 20F in FIG. 4).
- the processing device 15 causes the diving machine 20 to perform cross-sectional detection for detecting the pipeline while crossing the expected laying area of the pipeline extending in a predetermined direction, and the surface ship 10 from the acoustic positioning system 40.
- the relative position of the diving machine 20 with respect to the diving machine 20 is acquired, the position of the diving machine 20 is calculated based on the acquired relative position, and the measurement error area centered on the calculated position of the diving machine 20 and the expected laying area do not overlap. If the pipeline cannot be detected even if the diving machine 20 moves to the position, the traveling direction of the diving machine 20 may be changed and the diving machine 20 may perform the crossing detection again.
- the changing angle of the traveling direction may be 180 degrees or may be other than 180 degrees.
- FIG. 5 is a block diagram of the underwater work system 200 according to the present embodiment.
- the underwater work system 200 includes a transponder 50 in addition to the surface vessel 10 and the submersible 20 described above.
- the acoustic positioning system 40 of the second embodiment has a response device 45 provided in the transponder 50 in addition to the above-mentioned acoustic positioning devices 41 and 42 and response devices 43 and 44.
- FIG. 6 is a flowchart of the search program of the second embodiment.
- the search work of this embodiment is carried out based on this search program.
- the search program shown in FIG. 6 is executed by the processing device 15 of the surface vessel 10.
- the search program is started after the transponder 50 is dropped from the surface vessel 10 near the laying position of the pipeline at the initial stage of laying.
- the transponder 50 may be provided with a "weight” and a "float” so that the height position from the bottom of the water is constant.
- the processing device 15 moves the diving machine 20 to the transponder 50 (step S11).
- the movement of the diving machine 20 is performed while measuring the relative position of the diving machine 20 with respect to the transponder 50 using the acoustic positioning system 40.
- the measurement error by the acoustic positioning system 40 becomes smaller, so that the diving machine 20 can accurately reach the transponder 50 (the diving machines with reference numerals 20A and 20B in FIG. 7 described later). reference).
- FIG. 7 is a diagram showing the operation of the diving machine 20 in the search work of the present embodiment. Similar to FIG. 3, the alternate long and short dash line in FIG. 7 is the laying position of the pipeline at the beginning of laying, and the region sandwiched by the straight lines parallel to the alternate long and short dash line is the expected laying area of the pipeline.
- the processing device 15 calculates the position of the transponder 50 (step S13).
- the processing device 15 is based on the position information of the surface vessel 10 acquired from the GPS device 12 and the relative position of the transponder 50 with respect to the surface vessel 10 acquired from the acoustic positioning device 41, and the position of the transponder 50 (apparent absolute position). Can be calculated.
- the processing device 15 sets the measurement error region of the transponder 50 (step S14).
- the measurement error region is a region in which the transponder 50 may be located, and is a region centered on the position of the transponder 50 calculated in step S13.
- the region surrounded by the circle with reference numeral 50a is the measurement error region.
- the measurement error region increases as the distance between the surface vessel 10 and the transponder 50 increases. The distance between the surface vessel 10 and the transponder 50 can be estimated by the depth gauge 28 of the submersible 20 located in the vicinity of the transponder 50.
- the processing device 15 determines whether or not the measurement error area of the transponder 50 and the expected laying area of the pipeline overlap (step S15). When the processing device 15 determines that the measurement error area and the expected laying area overlap (YES in step S15), the processing device 15 sets the target position (step S16).
- This "target position” is the position of the transponder 50 so that the measurement error area and the expected laying area do not overlap. That is, the target position is the position of the transponder 50 so that the measurement error area and the expected laying area do not overlap. Further, in the present embodiment, the processing device 15 sets the target position so that the target position is located on a virtual line that passes through the position of the transponder 50 calculated in step S13 and is orthogonal to the expected laying area of the pipeline.
- the circle with reference numeral 50b in FIG. 7 is a measurement error region, since this measurement error region does not overlap with the expected laying region, reference numeral 50B located at the center of the circle with reference numeral 50b is attached.
- the point can be the target position.
- the position of the transponder 50 calculated in step S13 is the point with the reference numeral 50A
- the point with the reference numeral 50B is on the virtual line 102 that passes through the reference numeral 50A and is orthogonal to the expected laying area of the pipeline. Since it is located, it can be the target position from this condition as well.
- the processing device 15 moves the diving machine 20 to the target position (see step S17; the diving machine with reference numeral 20C in FIG. 7).
- the relative position of the diving machine 20 with respect to the transponder 50 is calculated based on the relative speed of the diving machine 20 with respect to the water bottom obtained from the relative speed meter 29 of the diving machine 20.
- the submersible 20 is moved to the target position.
- step S18 After the diving machine 20 reaches the target position, the processing device 15 changes the traveling direction and starts crossing detection (see step S18; the diving machine with reference numeral 20D in FIG. 7). Further, in step S15, when the processing device 15 determines that the expected laying area and the measurement error area do not overlap (NO in step S15), cross-sectional detection is started (step S18).
- the processing device 15 determines whether or not the diving machine 20 has detected the pipeline (step S19). If it is determined that the diving machine 20 has not detected the pipeline (NO in step S19), the crossing detection is continued (step S20; see the diving machines with reference numerals 20E and 20F in FIG. 7). Step S20 is repeated until the pipeline is detected. On the other hand, when it is determined that the diving machine 20 has detected the pipeline (YES in step S19), the search program ends, and the diving machine 20 starts work such as inspection of the pipeline.
- the underwater work system 200 includes a surface vessel 10 located on the water, a transponder 50 dropped from the surface vessel 10 to the bottom of the water, and a pipeline laid on the bottom of the water based on the dropped transponder 50. It is equipped with a submersible 20 that performs search work for finding out.
- the pipeline search work is performed using the transponder 50.
- the transponder 50 is less susceptible to the tidal current than the submersible 20 when dropped. Therefore, it can be dropped closer to the position where the pipeline search work is started than the submersible 20. As a result, according to the present embodiment, the pipeline search work can be efficiently performed.
- the underwater work system 200 includes an acoustic positioning system 40 that measures the relative position of the transponder 50 with respect to the surface vessel 10 using sound waves output from the acoustic positioning device 41 mounted on the surface vessel 10. Further includes a processing device 15. Further, the diving machine 20 has a relative speedometer 29 capable of measuring the relative speed of the diving machine 20 with respect to the bottom of the water.
- the processing device 15 acquires the relative position of the transponder 50 with respect to the surface ship 10 from the acoustic positioning system 40 at the start of the search operation, calculates the position of the transponder 50 based on the acquired relative position, and the calculated transponder 50
- a temporary transponder 50 is provided so that the measurement error area and the expected laying area do not overlap.
- the submersible 20 While calculating the relative position of the machine 20, the submersible 20 is moved until the position of the submersible 20 reaches the target position, and then the submersible 20 is subjected to crossing detection to detect the presence or absence of a pipeline while crossing the expected laying area. I am doing it.
- the pipeline search work is performed in consideration of the measurement error of the acoustic positioning system 40 and the aged movement of the pipeline, it is basically possible to search for the pipeline by one crossing detection. it can. Therefore, the pipeline search work can be efficiently performed.
- the processing device 15 sets the target position on a virtual line that passes through the drop position of the transponder 50 measured at the start of the search work and is orthogonal to the expected laying area of the pipeline. ing.
- the moving distance at the time of crossing detection can be reduced, and as a result, the pipeline search work can be performed more efficiently.
- the processing device 15 determines that the pipeline is not detected even if the crossing detection is performed once or a plurality of times, the diving machine 20 May be re-performed by the submersible 20 after being moved along the direction in which the expected laying area of the pipeline extends.
- the crossing detection is performed again by changing the position where the crossing detection is performed, so that the pipeline can be searched more reliably.
- the processing device 15 when the pipeline is not detected even if the crossing detection is performed once or a plurality of times, the processing device 15 performs the crossing detection.
- the movement distance of the submersible 20 may be extended so that the submersible 20 may perform crossing detection again.
- the operation program was executed by the processing device 15 provided on the surface vessel 10, but the processing provided on the diving machine 20 was executed.
- the operation program may be executed by the device 30, or the operation program may be executed by both processing devices 15 and 30.
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Abstract
Description
はじめに、本願の第1実施形態に係る水中作業システム100について説明する。まず、水中作業システム100の全体構成について説明する。本実施形態の水中作業システム100では、パイプラインに対して検査等の作業を行う前に、潜水機20を用いて水底に敷設されたパイプラインの探索が実施される。図1は、本実施形態に係る水中作業システム100のブロック図である。図1に示すように、水中作業システム100は、水上船10と、潜水機20と、音響測位システム40と、を備えている。なお、以下で単に「位置」というときは、絶対位置(地球座標系の位置)を意味するものとする。
水上船10は、水上を航行して潜水機20を支援する海上支援船である。水上船10は、潜水機20への電力供給や潜水機20が取得したデータの保存等を行っている。水上船10は、推進装置11と、GPS(Global Positioning System)装置12と、音響通信装置13と、給電装置14と、を有している。また、水上船10には処理装置15が設けられている。
潜水機20は、水上船10から独立して航行が可能な自律型無人潜水機であり、水中で作業を行うことができる。潜水機20は、推進装置21と、対象物検知装置22と、検査装置23と、受電装置24と、バッテリ25と、音響通信装置26と、慣性航法装置27と、深度計28と、相対速度計29と、を有している。また、潜水機20には、処理装置30が設けられている。
音響測位システム40は、水上船10に対する潜水機20の位置を測定するとともに、潜水機20に対する水上船10の位置を測定するためのシステムである。本実施形態の音響測位システム40は、水上船10及び潜水機20のそれぞれに設けられた音響測位装置41、42と、水上船10及び潜水機20のそれぞれに設けられた応答装置43、44と、を有している。なお、水上船10の音響測位装置41は、水上船10の音響通信装置13と一体的に構成されていてもよい。また、潜水機20の音響測位装置42は、潜水機20の音響通信装置26と一体的に構成されていてもよい。
次に、水底に敷設されたパイプラインを探し出す探索作業について説明する。パイプラインの探索作業は、パイプラインに対して検査等の作業を行う前に実施される。水上船10の処理装置15は、音響通信装置13、26を介して潜水機20の処理装置30から種々の情報を取得し、これらの情報基づいて探索プログラムを実行する。水上船10の処理装置15は、探索プログラムにおいて種々の演算処理を行い、音響通信装置13、26を介して潜水機20の処理装置30に制御信号を送信する。潜水機20の処理装置30は、受信した制御信号に基づいて推進装置21等を制御する。
以上が本実施形態に係る水中作業システム100の説明である。本実施形態に係る水中作業システム100は、水上に位置する水上船10と、水底に敷設されたパイプラインを探し出す探索作業を行う潜水機20と、水上船10に搭載された音響測位装置41から出力された音波を用いて水上船10に対する潜水機20の相対位置を測定する音響測位システム40と、処理装置15と、を備えている。そして、処理装置15は、探索作業の開始時に音響測位システム40から水上船10に対する潜水機20の相対位置を取得し、取得した相対位置に基づいて潜水機20の位置を算出し、算出した潜水機20の位置を中心とする測定誤差領域と所定の方向に延びるパイプラインの予想敷設領域とが重複する場合には、測定誤差領域と予想敷設領域とが重複しない位置にまで潜水機20を移動させた後、潜水機20に予想敷設領域を横断しながらパイプラインの有無を検知する横断検知を実施させている。
次に、本願の第2実施形態に係る水中作業システム200について説明する。図5は、本実施形態に係る水中作業システム200のブロック図である。図5に示すように、水中作業システム200は、上述した水上船10及び潜水機20に加え、トランスポンダ50を備えている。また、第2実施形態の音響測位システム40は、上述した音響測位装置41、42、応答装置43、44に加え、トランスポンダ50に設けられた応答装置45を有している。
以上が、本実施形態に係る水中作業システム200の説明である。本実施形態に係る水中作業システム200は、水上に位置する水上船10と、水上船10から水底に投下されるトランスポンダ50と、投下されたトランスポンダ50を基準として、水底に敷設されたパイプラインを探し出す探索作業を行う潜水機20と、を備えている。
15 処理装置
20 潜水機
30 処理装置
40 音響測位システム
41 音響測位装置
42 音響測位装置
50 トランスポンダ
100 水中作業システム
102 仮想線
200 水中作業システム
Claims (8)
- 水上に位置する水上船と、
水底に敷設されたパイプラインを探し出す探索作業を行う潜水機と、
前記水上船に搭載された音響測位装置から出力された音波を用いて前記水上船に対する前記潜水機の相対位置を測定する音響測位システムと、
処理装置と、を備え、
前記処理装置は、前記探索作業の開始時に前記音響測位システムから前記水上船に対する前記潜水機の相対位置を取得し、取得した前記相対位置に基づいて前記潜水機の位置を算出し、算出した前記潜水機の位置を中心とする測定誤差領域と所定の方向に延びる前記パイプラインの予想敷設領域とが重複する場合には、前記測定誤差領域と前記予想敷設領域とが重複しない位置にまで前記潜水機を移動させた後、前記潜水機に前記予想敷設領域を横断しながら前記パイプラインの有無を検知する横断検知を実施させる、水中作業システム。 - 水上に位置する水上船と、
水底に敷設されたパイプラインを探し出す探索作業を行う潜水機と、
前記水上船に搭載された音響測位装置から出力された音波を用いて前記水上船に対する前記潜水機の相対位置を測定する音響測位システムと、
処理装置と、を備え、
前記処理装置は、前記探索作業の開始時に前記音響測位システムから前記水上船に対する前記潜水機の相対位置を取得し、取得した前記相対位置に基づいて前記潜水機の位置を算出し、算出した前記潜水機の位置を中心とする測定誤差領域と所定の方向に延びる前記パイプラインの予想敷設領域との間隔が所定距離でない場合には、前記測定誤差領域と前記予想敷設領域の間隔が前記所定距離となる位置にまで前記潜水機を移動させた後、前記潜水機に前記予想敷設領域を横断しながら前記パイプラインの有無を検知する横断検知を実施させる、水中作業システム。 - 水上に位置する水上船と、
水底に敷設されたパイプラインを探し出す探索作業を行う潜水機と、
前記水上船に搭載された音響測位装置から出力された音波を用いて前記水上船に対する前記潜水機の相対位置を測定する音響測位システムと、
処理装置と、を備え、
前記処理装置は、前記探索作業において、前記潜水機に所定の方向に延びる前記パイプラインの予想敷設領域を横断しながら前記パイプラインを検知する横断検知を実施させつつ、前記音響測位システムから前記水上船に対する前記潜水機の相対位置を取得し、取得した前記相対位置に基づいて前記潜水機の位置を算出し、算出した前記潜水機の位置を中心とする測定誤差領域と前記予想敷設領域とが重複しなくなる位置にまで前記潜水機が移動しても前記パイプラインを検知できない場合には、前記潜水機の進行方向を変えて前記潜水機に前記横断検知を再度実施させる、水中作業システム。 - 水上に位置する水上船と、
前記水上船から水底に投下されるトランスポンダと、
投下された前記トランスポンダを基準として、水底に敷設されたパイプラインを探し出す探索作業を行う潜水機と、を備えた水中作業システム。 - 前記水上船に搭載された音響測位装置から出力された音波を用いて前記水上船に対する前記トランスポンダの相対位置を測定する音響測位システムと、
処理装置と、をさらに備え、
前記潜水機は水底に対する当該潜水機の相対速度を計測可能な相対速度計を有し、
前記処理装置は、前記探索作業の開始時に音響測位システムから前記水上船に対する前記トランスポンダの相対位置を取得し、取得した前記相対位置に基づいて前記トランスポンダの位置を算出し、算出した前記トランスポンダが投下された位置を中心とする測定誤差領域と所定の方向に延びる前記パイプラインの予想敷設領域とが重複する場合には、前記測定誤差領域と前記予想敷設領域とが重複しなくなるような仮の前記トランスポンダが投下された位置を目標位置に設定し、前記潜水機を前記トランスポンダが投下された位置まで移動させた後、前記相対速度計から取得した前記潜水機の水底に対する相対速度に基づいて前記トランスポンダに対する前記潜水機の相対位置を算出しつつ前記潜水機の位置が前記目標位置に至るまで前記潜水機を移動させ、その後、前記潜水機に前記予想敷設領域を横断しながら前記パイプラインの有無を検知する横断検知を実施させる、請求項4に記載の水中作業システム。 - 前記処理装置は、前記探索作業の開始時に測定した前記トランスポンダの投下位置を通り前記パイプラインの予想敷設領域に直交する仮想線上に前記目標位置を設定する、請求項5に記載の水中作業システム。
- 前記処理装置は、前記横断検知を1回又は複数回実施しても前記パイプラインが検知されない場合、前記潜水機を前記パイプラインの予想敷設領域が延びる方向に沿って移動させた後、前記潜水機に前記横断検知を再度実施させる、請求項1乃至6のうちいずれか一の項に記載の水中作業システム。
- 前記処理装置は、前記横断検知を1回又は複数回実施しても前記パイプラインが検知されない場合、前記横断検知における前記潜水機の移動距離を延ばして前記潜水機に前記横断検知を再度実施させる、請求項1乃至6のうちいずれか一の項に記載の水中作業システム。
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GB2616391A (en) | 2023-09-06 |
GB2600336B (en) | 2023-08-30 |
AU2023204284A1 (en) | 2023-07-27 |
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GB2600336A (en) | 2022-04-27 |
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NO20220145A1 (ja) | 2022-01-28 |
GB202200939D0 (en) | 2022-03-09 |
GB2616391B (en) | 2024-01-31 |
AU2020328964B2 (en) | 2023-06-22 |
US20220153396A1 (en) | 2022-05-19 |
JP7362343B2 (ja) | 2023-10-17 |
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GB2600336A9 (en) | 2022-11-23 |
JP2021028186A (ja) | 2021-02-25 |
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