KR20170036258A - Vessel Heading Control System in Floating Offshore Plant - Google Patents

Vessel Heading Control System in Floating Offshore Plant Download PDF

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Publication number
KR20170036258A
KR20170036258A KR1020150135203A KR20150135203A KR20170036258A KR 20170036258 A KR20170036258 A KR 20170036258A KR 1020150135203 A KR1020150135203 A KR 1020150135203A KR 20150135203 A KR20150135203 A KR 20150135203A KR 20170036258 A KR20170036258 A KR 20170036258A
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KR
South Korea
Prior art keywords
hull
thruster
unit
control
variable
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KR1020150135203A
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Korean (ko)
Inventor
김덕기
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현대중공업 주식회사
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Priority to KR1020150135203A priority Critical patent/KR20170036258A/en
Publication of KR20170036258A publication Critical patent/KR20170036258A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • 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
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/17—Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/42—Steering or dynamic anchoring by propulsive elements; Steering or dynamic anchoring by propellers used therefor only; Steering or dynamic anchoring by rudders carrying propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2213/00—Navigational aids and use thereof, not otherwise provided for in this class
    • B63B2213/02—Navigational aids and use thereof, not otherwise provided for in this class using satellite radio beacon positioning systems, e.g. the Global Positioning System GPS

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)

Abstract

The present invention relates to a vessel heading control system in a floating offshore plant, which controls the bow of the hull of the floating offshore plant to be constantly directed in a direction based on a turret when an LNG carrier comes alongside the floating offshore plant to unload cargo. The vessel heading control system in the floating offshore plant comprises: an instruction unit which provides a general instruction signal and data for automatic or manual control of a heading direction of the hull so that the heading direction of the hull can be kept constant; a direction determination unit which determines a heading direction of the hull if the heading direction of the hull is automatically controlled depending on the instruction signal of the instruction unit, and applies information on the determined heading direction to a direction control unit; the direction control unit which outputs a control signal for automatic control of a variable thruster installed on the stem side based on the information on the heading direction applied by the direction determination unit; and a speed-variable driving unit which drives a motor by applying variable frequency AC power to the motor, which is provided for driving the variable thruster according to the control signal output by the direction control unit, and thus drives the variable thruster. According to the present invention, the vessel heading system controls the heading direction of the hull of the floating offshore plant to be kept constant based on the turret when the LNG carrier comes alongside a floating offshore plant to unload cargo, and does not employ an expensive dynamic positioning system to keep the heading direction of the hull of the floating offshore plant, thereby enhancing economic feasibility.

Description

Technical Field [0001] The present invention relates to a hull direction control system for a floating offshore plant,

The present invention relates to a floating offshore plant for producing, storing and unloading LNG (liquefied natural gas) from offshore. More particularly, the present invention relates to a floating offshore plant having a turret Of the floating offshore plant hull is adjusted so as to maintain the direction of the bow of the hull in a certain direction but it is economically feasible to maintain the forward direction of the floating offshore plant hull in a certain direction without applying the expensive dynamic positioning system. To a hull direction control system.

Floating offshore plants such as LNG-FPSO (Floating Production Storage and Offloading) and FLNG (Floating Liquefaction Natural Gas) are used to produce, store and unload LNG by mining natural gas buried on the sea floor As a marine facility.

Such a floating offshore plant consists of a sub-facility (hull) that floats all facilities at sea and stores LNG, and a topside that pretreats, liquefies and unloads LNG.

In the floating type offshore plant, when the LNG produced and stored by itself is transferred to the user, the LNG ship 20 is dug into the floating offshore plant 10 and the floating offshore plant 10 to the LNG carrier 20, the LNG carrier 20 transfers the LNG to the user.

When the LNG ship 20 is unloaded to the LNG ship 20 by docking on the floating offshore plant 10 as described above, the LNG ship 20 is fixedly moored at a fixed position on the seabed by the anchor chain 17, And the position of the floating offshore plant 10 is adjusted in the left and right directions around a turret 15 that collects the natural gas to be collected and transported from the specific location It is necessary to adjust the position of the floating offshore plant 10 so that the distance between the LNG ship 20 and the LNG carrier 20 is maintained within the specified range.

Thus, the turret system is used in the case of adjusting the hull position of the floating offshore plant 10 in the past. The turret system comprises a turret as a fixed cylindrical steel structure that is connected to anchor chain 17 and does not rotate. The turret of the floating offshore plant 10 is connected to the anchor chain 17 by a bearing system and a rotary joint, By moving the hull of the floating offshore plant 10 around the turret by means of a dynamic positioning system with a plurality of propulsion devices coupled to the turret, the position of the hull of the floating offshore plant 10 is adjusted to smooth the flow of the submerged fluid Thereby allowing the floating offshore plant 10 to rotate around the turret 15 at sea to adjust the position of the floating offshore plant 10 as illustrated in FIG.

As described above, in the conventional floating-type offshore plant 10, the position is adjusted by applying the dynamic positioning system in the case of adjusting the position of the ship to be fixed at a specific position around the turret 15, The dynamic position system for adjusting the position of the hull is costly to install and maintain, which leads to a problem of lowering the economical efficiency.

The present invention has been proposed in order to overcome the problems of the conventional art as described above. In the case where an LNG ship is stowed in a floating offshore plant and the loading operation is performed, the forward direction of the floating type offshore plant hull is defined as a constant The present invention provides a hull direction control system in a floating offshore plant which is adapted to maintain a forward direction of a floating type of an offshore plant hull in a predetermined direction without an expensive dynamic position system.

In order to achieve the above-mentioned object, the present invention provides a control system for an automatic transmission, comprising: a commanding unit for automatically or manually controlling a forward directional control of a hull so as to maintain a bow direction of the hull around a turret in a predetermined direction, Wow; A direction determining unit for determining a moving direction of the hull and automatically applying the determined moving direction information to the direction control unit when automatically controlling the bow direction of the hull according to the command signal of the command unit; A direction control unit for outputting a control signal for automatically controlling a variable thruster provided on the aft side based on the moving direction information applied from the direction determining unit; And a variable speed driver for driving the variable thruster by driving a motor by applying an alternating current power of variable frequency to a motor for driving the variable thruster in accordance with a control signal outputted from the direction control unit And provides a hull direction control system in an offshore plant.

According to the hull direction control system in the floating offshore plant according to the present invention, the command unit may include a direction control terminal for providing the hull movable range data to the direction determination unit when the hull direction control of the hull is automatically performed, and; And a thruster control terminal for outputting a control signal for manually controlling the forward directional control of the hull.

The gyro direction control system in the floating offshore plant according to the present invention includes: a gyro compass which detects azimuth information and provides the azimuth information to the direction determination unit; A wind sensor for detecting a direction and a velocity of the wind and providing the direction and the velocity to the direction determination unit; A current sensor for detecting the direction and speed of the current flow and providing the detected direction and speed to the direction determination unit; And a GPS signal receiving unit for receiving the GPS (Global Positioning System) signal from the satellite and providing the acquired position information to the direction determining unit.

According to the ship direction control system in the floating offshore plant according to the present invention, the direction determination section can grasp the current position of the ship on the basis of the orientation information from the gyro compass and the GPS signal from the GPS signal receiving section, The direction of the hull to maintain the bow direction of the hull in a specific direction is determined by reflecting the wind direction and velocity information of the hull and the current direction and velocity information from the current sensor.

According to the hull direction control system in the floating offshore plant according to the present invention, the direction determination unit determines the hull moving direction so as to move the hull within the hull movable range by referring to the hull moving range data applied from the command unit do.

In addition, according to the present invention, when the control right is not received from the thruster control terminal, the hull direction control system in the floating offshore plant transmits the control signal applied from the direction control unit to the speed variable driving unit, And a local thruster controller for applying a control signal to the variable speed driver according to a manual operation of the user when the control signal is received from the thruster control terminal.

According to the present invention, the local thruster control unit collects the thruster driving state detection data of the variable thruster installed on the aft side and applies the collected thruster driving state detection data to the direction control unit, To the direction control section, motor drive state data indicating the drive state of the motor for driving the variable thruster provided on the stern side.

According to the ship direction control system in the floating offshore plant according to the present invention, the direction control unit collects thruster driving state detection data from the local thruster control unit and motor driving state data from the speed variable driving unit To the supervisory control section, and the monitoring and control section monitors the driving state of the variable thruster and thruster driving motor.

In the meantime, according to the present invention, the speed variable drive unit supplies the motor drive state data representing the drive state of the motor for driving the variable thruster installed on the aft side to the direction determination unit Thus, the direction determining unit reflects the driving state of the thruster driving motor to determine the direction of the hull.

According to the hull direction control system in the floating offshore plant according to the present invention, the surveillance control unit receives all the data related to the forward direction control situation applied from the direction control unit and monitors the overall driving situation of the hull direction control system And an integrated control terminal for controlling the integrated control terminal; And a backup thruster control terminal for backing up and storing all data related to the forward direction control and performing the forward direction manual control function of the command unit in response to a user request.

According to the present invention, the variable thrusters are provided on the stern side and include a propeller in the duct, and are coupled to the bottom of the hull through a support base , The motor is driven to rotate the support so that the duct and the propeller are adjusted to the left and right direction by the corresponding angle to adjust the propulsion direction and the drive shaft provided inside the support is driven by the motor to rotate the propeller in the forward and backward directions To generate thrust force.

According to the present invention, when loading and unloading an LNG ship by bidding an LNG ship to a floating offshore plant, it is necessary to adjust the bow direction of the floating type offshore plant hull about a turret to maintain a predetermined direction, It is possible to adjust the fore-going direction of the floating-type offshore plant hull in a certain direction, thereby improving the economical efficiency.

1 is a perspective view illustrating the operation of a conventional floating offshore plant.
2 is a plan view illustrating hull position adjustment in a conventional floating offshore plant.
3 is a bottom view illustrating the installation of a thruster for orientation of the hull in a floating offshore plant according to the present invention.
4 is a side view illustrating the installation of the variable thruster according to the present invention.
5 is a perspective view illustrating a variable thruster applied to the present invention.
6 is a block diagram illustrating a hull direction control system in a floating offshore plant according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the present invention is not limited to the technical spirit and essential structure and operation of the present invention.

The present invention relates to a floating type offshore plant, in which a forward direction of a floating type of offshore plant hull is adjusted to maintain a predetermined direction around the turret when an unloading operation is performed by berthing an LNG ship, It is economically feasible to keep the forward direction of the floating offshore plant hull in a certain direction.

In order to accomplish this, the present invention can be applied to a float-type offshore plant in which, when adjusting the bow direction around the turret in a certain direction, as shown in the bottom view of Fig. 3, The variable thruster 40 is installed on the turret 35 and driven by the variable thruster 40 to maintain the forward direction of the floating offshore plant 30 in a predetermined direction around the turret 35. [

As described above, the variable stator 40 is installed on the stern side of the floating offshore plant 30, and the propulsive force is generated by driving the variable thruster 40 to float the turret 35 And adjusts the bow direction of the offshore plant 30 to keep it in a certain direction.

In the present invention, the variable thruster (40) installed on the stern side of the floating offshore plant (30) is installed so as to be submerged in seawater as illustrated in the side view of Fig. 4, the turret 35 on the forward side of the floating offshore plant 30 is fixed at a fixed position by the anchor chain 36, and the variable thruster 40 varies the direction of the propulsive force And adjusts the forward direction of the float-type offshore plant (30) about the turret (35) to keep it in a certain direction.

The variable thruster (40) installed on the aft side of the floating offshore plant (30) is equipped with one propeller, which adjusts the direction of the propeller so as to adjust the propelling direction and generate propulsive force in the forward and backward directions , The floating direction of the floating structure of the offshore plant (30) is adjusted so that the direction of the bow in the sea of the hull is maintained in a certain direction.

5, the variable thruster 40 installed on the stern side of the floating offshore plant 30 has a propeller 45 inside the duct 44 and a support 43, To the bottom of the hull.

The variable thruster 40 drives the motor to rotate the support table 43 as shown by the arrow A-A 'so as to adjust the duct 44 and the propeller 45 in the left and right direction of the ship, And the drive shaft provided in the support table 43 is driven by the motor to rotate the propeller 45 to generate propulsive force in the forward and backward directions as shown by the arrow B or arrow B ' 45) to the left and right direction of the ship so as to generate forward and backward propulsion forces for the corresponding propulsion directions.

In the case where the variable thruster 40 installed on the stern side of the floating offshore plant 30 is driven to adjust the forward direction of the floating offshore plant 30 in the predetermined direction around the turret 35 The driving of the variable thruster 40 is controlled by the hull direction control system 100 as illustrated in Fig.

The hull direction control system 100 of the floating marine plant applied to the present invention includes a monitoring control unit 110, a command unit 120, a direction control unit 130, a direction determination unit 140, a local thruster control unit 150, A speed variable driving unit 160, a gyro compass 170, a wind sensor 171, a current sensor 172, and a GPS signal receiving unit 173.

The monitoring and control unit 110 monitors and controls all the driving situations of the hull direction control system 100 and backs up all data related to hull direction control. The monitoring control unit 110 includes an integrated control terminal 112 and a backup thruster control terminal 114. The integrated control terminal 112 controls the overall control terminal 130 The backup thruster control terminal 114 backs up all the data related to the hull direction control and stores the backup data in the hull direction control system 100 in accordance with the user's request, Direction manual control function.

The command unit 120 outputs the control signal for manually controlling the hull direction control to the local thruster control unit 150 or the hull drivable range data in the case where the hull direction control is automatically performed to the direction determination unit 140 ). The command unit 120 includes a direction control terminal 122 and a thruster control terminal 124. The direction control terminal 122 transmits hull drivability range data in the case where the hull direction control is automatically performed, And the thruster control terminal 124 outputs a control signal to the local thruster control unit 150 for manually controlling the hull direction control.

The gyro compass 170 detects azimuth information and provides azimuth information to the azimuth determiner 140. The azimuth sensor 171 detects the direction and velocity of the wind and provides it to the azimuth determiner 140, The GPS signal receiving unit 173 receives the GPS (Global Positioning System) signal from the satellite, and outputs the acquired position information to the direction determining unit 140. The direction determining unit 140 detects the direction and the velocity of the current, .

The direction determining unit 140 determines the moving direction of the ship in the case of automatically controlling the direction of the hull and applies the determined moving direction information to the direction controlling unit 130 so that the direction controlling unit 130 allows the direction controlling unit 130 to detect the determined moving direction information And outputs a control signal for thruster control.

When determining the moving direction of the hull in the automatic direction control of the hull, the direction determination unit 140 determines the current position of the hull based on the azimuth information from the gyro compass 170 and the GPS signal from the GPS signal receiving unit 173 Determines the moving direction of the hull for fixing and positioning the hull at a specific position by reflecting wind direction and velocity information from the wind sensor 171 and current direction and velocity information from the current sensor 172, And applies direction information to the direction control unit 130.

The direction determining unit 140 refers to the hull movement range data applied from the command unit 120 in the case of determining the hull moving direction for maintaining the bow direction of the hull in a specific direction, To move the hull.

The direction controller 130 outputs to the local thruster controller 150 a control signal for controlling the hull to move in the moving direction based on the hull moving direction information supplied from the direction determining unit 140.

The local thruster control unit 150 itself has a manual operation device and outputs a control signal to the speed variable driving unit 160 according to a manual instruction of the user to drive the variable thruster 40 by the speed variable driving unit 160 The variable thruster 40 is driven by the speed variable driving unit 160 to transmit the control signal applied from the direction control unit 130 to the speed variable driving unit 160, Automatically adjusts the bow direction.

The variable speed driving unit 160 drives the variable thruster 40 based on the control signal applied from the local thruster control unit 150 to generate propulsion force to adjust the bow direction of the hull, A variable frequency alternating current is applied to the motor for driving the motor.

The local thruster control unit 150 collects the thruster driving state detection data such as the pressure and temperature of the thruster 40 at the time of driving the variable thruster 40 and applies the thruster driving state detection data to the direction control unit 130. [ The variable speed driving unit 160 drives the variable thruster 40 by varying the speed of the motor by applying a variable frequency alternating current to the motor for driving the variable thruster 40, When adjusting the bow direction, motor driving state data indicating the driving state of the motor is applied to the direction control unit 130.

The direction control unit 130 collects the thruster driving state detection data from the local thruster control unit 150 and the motor driving state data from the speed variable driving unit 160 and provides them to the monitoring control unit 110, The controller 110 causes the variable thruster 40 and the thruster driving motor to monitor the driving state of the thruster driving motor.

The variable speed drive unit 160 applies variable frequency alternating current to the motor for driving the variable thruster 40 to vary the speed of the motor to drive the variable thruster 40 to generate propulsive force, And the motor driving state data indicating the driving state of the motor is applied to the direction determination unit 140 to determine the direction of the hull by reflecting the driving state of the thruster driving motor do.

When the thruster control terminal 124 of the command unit 120 applies a manual control signal to the variable speed driving unit 160 through the local thruster control unit 150 in the case of manually controlling the variable thruster 40, The stenter 40 is manually controlled to adjust the bow direction of the hull. When the thruster control terminal 124 hands over the control right to the local thruster control unit 150, the local thruster control unit 150 directly applies the manual control signal to the speed variable driving unit 160 So that the variable thruster 40 is manually controlled to adjust the bow direction of the hull.

When the command unit 120 transmits control related data and signals to the direction determination unit 140 and the local thruster control unit 150, the control related data is transmitted to the backup thruster control unit 110 of the monitoring and control unit 110 Collected and stored in the terminal 114, thereby enabling the monitoring and control unit 110 to perform the function of the command unit 120 instead.

The backup thruster control terminal 114 of the monitoring and control unit 110 performs the manual control function of the thruster control terminal 124 upon receiving the control right from the thruster control terminal 124. By the manual instruction of the user A manual control signal is directly applied to the speed variable driver 160 through the local thruster controller 150 to manually control the variable thruster 40 to adjust the bow direction of the hull.

The backup thruster control terminal 114 and the integrated control terminal 112 are connected to each other through a communication network in the supervisory control unit 110 and are connected to the local thruster control unit 150 by the backup thruster control terminal 114 The control-related data may be provided to the integrated control terminal 112 through the communication network and used for monitoring and controlling the system.

The hull direction control system 100 in the floating offshore plant according to the present invention having the functions described above functions as follows.

When it is desired to automatically control the bow direction of the floating offshore plant in a certain direction, the direction control terminal 122 of the command unit 120 changes the hull drivability range data at the time of automatically performing the bow direction control to the direction To the determination unit 140, and applies the automatic direction adjustment command to the direction determination unit 140. [

The direction determination unit 140 determines the current position of the hull based on the azimuth information from the gyro compass 170 and the GPS signal from the GPS signal receiving unit 173, The hull moving range data for determining the hull moving direction for maintaining the bow direction of the hull in a specific direction by reflecting the speed information and the current direction and velocity information from the current sensor 172 is determined, , Determines to move the hull within the movable range of the hull, and applies the hull moving direction information to the direction control unit (130).

The direction controller 130 outputs a control signal to the local thruster controller 150 for automatically controlling the player to move the player in the moving direction based on the ship moving direction information supplied from the direction determiner 140 .

The local thruster control unit 150 transmits the control signal applied from the direction control unit 130 to the speed variable driving unit 160 to drive the variable thruster 40 by the speed variable driving unit 160, Adjust the player's direction.

At this time, the speed variable driving unit 160 drives the variable thruster 40 based on the control signal applied from the local thruster control unit 150 to generate driving force to adjust the bow direction of the hull, 40 by varying the speed of the motor by applying a frequency variable AC current to the motor.

In this way, in the case where the processing for automatically maintaining the bow direction of the floating offshore plant in a predetermined direction is performed, the local thruster control unit 150 controls the thruster The variable thruster 40 receives the thruster driving state detection data such as the pressure and temperature of the variable thruster 40 and applies the same to the direction control unit 130. The variable speed driving unit 160 includes a motor And applies the driving state data to the direction control unit 130.

The direction control unit 130 collects the thruster driving state detection data from the local thruster control unit 150 and the motor driving state data from the speed variable driving unit 160 and provides them to the monitoring control unit 110, The monitoring control unit 110 monitors the driving state of the variable thruster 40 and thruster driving motor.

In addition, the variable speed driving unit 160 drives the variable thruster 40 installed at the bottom of the stern side by applying variable frequency alternating current to the motor for driving the variable thruster 40 to vary the speed of the motor, The motor driving state data indicating the driving state of the corresponding motor is applied to the direction determining unit 140 so that the direction determining unit 140 reflects the driving state of the thruster driving motor, Determines the direction.

Meanwhile, when it is desired to manually control the bow direction of the floating offshore plant in a predetermined direction, the thruster control terminal 124 of the command unit 120 transmits a control signal to the local thruster control unit The thruster control terminal 124 adjusts the forward direction by manually controlling the variable thruster 40 installed at the bottom of the stern side by applying the control signal to the local thruster controller 150 The local thruster control unit 150 directly controls the variable thruster 40 by applying a control signal directly to the speed variable driving unit 160 by a manual instruction of the user to adjust the player's direction, The thruster control terminal 114 of the backup thief station 110 receives the control right from the thruster control terminal 124 and receives the control right through the local thruster control unit 150 FIG hayeoseo applying a direct control signal to the variable driving unit 160 adjusts the direction of the player manually controls the variable thruster (40).

The local thruster control unit 150 controls the local thruster controller 40 so that the thruster 40 is operated while the variable thruster 40 is operating, The variable thruster 40 generates a thruster driving state detection data such as a pressure and a temperature of the variable thruster 40 and applies the same to the direction control unit 130. The speed variable driving unit 160 generates a motor driving state And applies the data to the direction control unit 130.

The direction control unit 130 collects the thruster driving state detection data from the local thruster control unit 150 and the motor driving state data from the speed variable driving unit 160 and provides them to the monitoring and control unit 110, The monitoring control unit 110 monitors the driving state of the variable thruster 40 and thruster driving motor.

As described above, according to the present invention, in order to carry out the unloading operation by burying an LNG ship on a floating offshore plant, when adjusting the bow direction of the floating-type offshore plant hull to maintain a certain direction, the variable thruster 40 are driven so as to adjust the bow direction of the hull around a turret 35 moored to the anchor chain 36 so as to keep the hull in a certain direction so that the load of the floating hull It is possible to maintain the bow direction in a certain direction, thereby improving the economical efficiency.

The present invention is not limited to the above description and various changes and modifications of the present invention may be made without departing from the spirit of the present invention, Such modifications are considered to be within the technical scope of the present invention.

The present invention may be usefully applied to a case of adjusting the bow direction of a floating offshore plant such as LNG-FPSO and FLNG to keep it in a certain direction. According to the present invention, when loading and unloading an LNG ship by bidding an LNG ship to a floating offshore plant, it is necessary to adjust the bow direction of the floating type offshore plant hull about a turret to maintain a predetermined direction, It is possible to adjust the fore-going direction of the floating-type offshore plant hull in a certain direction, thereby improving the economical efficiency.

10, 30; Floating Offshore Plants 15, 35; Turret
40; Variable thruster 100; Hull direction control system
110; Monitoring control unit 120; Command department
130; A direction control unit 140; Direction determining unit
150; Local thruster control unit 160; The variable-
170; Gyro compass 171; Wind sensor
172; Current sensor 173; GPS signal receiver

Claims (12)

An instruction unit for providing a command signal and data for automatically or manually controlling the bow direction control of the hull so as to maintain the bow direction of the hull around a turret in a predetermined direction;
A direction determining unit for determining a moving direction of the hull and automatically applying the determined moving direction information to the direction control unit when automatically controlling the bow direction of the hull according to the command signal of the command unit;
A direction control unit for outputting a control signal for automatically controlling a variable thruster provided on the aft side based on the moving direction information applied from the direction determining unit;
And a variable speed driver for driving the variable thruster by driving a motor by applying an alternating current power of variable frequency to a motor for driving the variable thruster in accordance with a control signal outputted from the direction control unit Hull direction control system in offshore plant.
The method according to claim 1,
[0028]
A direction control terminal for providing hull movement range data to the direction determination unit when the hull forward direction control is automatically performed;
And a thruster control terminal for outputting a control signal for manually controlling the forward direction control of the hull.
The method according to claim 1,
A gyro compass for detecting azimuth information and providing the azimuth information to the direction determination unit;
A wind sensor for detecting a direction and a velocity of the wind and providing the direction and the velocity to the direction determination unit;
A current sensor for detecting the direction and speed of the current flow and providing the detected direction and speed to the direction determination unit;
Further comprising: a GPS signal receiving unit for receiving the GPS (Global Positioning System) signal from the satellite and providing the obtained position information to the direction determining unit.
4. The method according to any one of claims 1 to 3,
The direction determining unit determines the current position of the ship based on the azimuth information from the gyro compass and the GPS signal from the GPS signal receiving unit, and reflects the wind direction and velocity information from the wind sensor and the current direction and velocity information from the current sensor Wherein the hull moving direction is determined to maintain the bow direction of the hull in a specific direction.
5. The method of claim 4,
Wherein the direction determining unit determines a moving direction of the hull so as to move the hull within the movable range of the hull by referring to the hull moving range data applied from the command unit.
3. The method according to claim 1 or 2,
If the control signal is not received from the thruster control terminal, transfers the control signal applied from the direction control section to the variable speed driving section or transmits the control signal applied from the thruster control terminal to the variable speed driving section, Further comprising a local thruster control unit for applying a control signal to the variable speed drive unit according to a manual operation of the user when the control unit receives the control signal.
The method according to claim 6,
Wherein the local thruster control unit collects thruster driving state detection data of a variable thruster installed on a stern side and applies the collected data to a direction control unit.
The method according to claim 6,
Wherein the speed variable drive unit applies motor drive state data indicating a drive state of a motor for driving a variable thruster provided on a stern side to a direction control unit.
The method according to claim 6,
Wherein the direction control unit collects thruster driving state detection data from the local thruster control unit and motor driving state data from the speed variable driving unit and provides the data to the monitoring control unit so that the monitoring control unit controls the variable thruster and thruster driving Wherein the control unit monitors the driving state of the motor.
The method according to claim 6,
The speed variable drive unit applies motor drive state data indicating the drive state of the motor for driving the variable thruster installed on the aft side to the direction determination unit so that the direction determination unit reflects the drive state of the thruster drive motor, Wherein the hull direction control system in the floating offshore plant determines the hull direction control system.
10. The method of claim 9,
The monitoring /
An integrated control terminal for monitoring and controlling all the driving situations of the hull direction control system by receiving all data related to the forward direction control situation applied from the direction control unit;
And a backup thruster control terminal for backing up and storing all data related to the forward direction control and performing the forward direction manual control function of the command unit in response to a user request.
The method according to claim 1,
In the variable thruster,
The propeller is mounted on the stern side, and a propeller is provided inside the duct. The propeller is coupled to the bottom of the hull through a support base. The propeller is rotated by driving the motor to adjust the duct and the propeller in the left- And the driving shaft provided in the support frame is driven by a motor to rotate the propeller so as to generate propulsive forces in the forward and backward directions.
KR1020150135203A 2015-09-24 2015-09-24 Vessel Heading Control System in Floating Offshore Plant KR20170036258A (en)

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