KR102010875B1 - Dynamic positioning system having iceberg load prediciton apparatus and iceberg load prediction method of the same - Google Patents

Abstract

The present invention maintains an operating position having an ice floe load estimating device capable of predicting the load of drift ice and reducing the possibility of breakage and sinking of the ship by crushing ice or avoiding drift ice and minimizing down time in the sea. A system and its ice load prediction method.
According to one embodiment of the invention, the DP measuring unit having a plurality of sensors for measuring the vessel information including the position of the vessel; A thrust unit controlling the position of the vessel; A DP control unit outputting a control signal to the thrust unit based on the measured value input from the DP measurement unit; And an drift ice load predicting device for measuring drift ice to predict the load of the drift ice.

Description

DYNAMIC POSITIONING SYSTEM HAVING ICEBERG LOAD PREDICITON APPARATUS AND ICEBERG LOAD PREDICTION METHOD OF THE SAME}

The present invention relates to a dynamic position maintenance system having an drift ice load prediction device and a method for estimating drift ice loads thereof, and more particularly, to an drift ice load prediction device capable of minimizing downtime in the ocean by estimating the load of drift ice. A dynamic positioning system and its ice load prediction method.

Dynamic Positioning System (Dynamic Positioning System) is a device for continuously positioning the position of the ship at a desired point, which is required for a ship performing a function such as drilling or exploration.

With the recent depletion of oil and advances in exploration technology, exploration and drilling areas have expanded, and in recent years there has been an increase in work in the polar regions.

However, the inventors of the present invention have found that conventional dynamic positioning systems are difficult to use in environments where the air temperature is low and the load of drift ice affects the hull, such as in polar regions.

In particular, the conventional dynamic positioning system cannot predict the load of the drift ice, so when the drift ice approaches, it unconditionally turns or stops the operation, or the drift ice collides to induce the breakage or sinking of the hull. Republic of Korea Patent Publication No. 10-2009-0020732 (Dynamic position control system and method, 2009.02.27) relates to a dynamic position control system for controlling the magnetic position using the current and wind direction data.

SUMMARY OF THE INVENTION An object of the present invention is to estimate the load of drift ice and to prevent ice breakage or avoid drift ice to reduce the possibility of ship breakage and sinking, and to provide a floating ice load prediction device capable of minimizing down time at sea. The present invention provides an operation position maintaining system and a method of estimating drift ice thereof.

According to an embodiment of the present invention for achieving the above object, a DP measuring unit having a plurality of sensors for measuring the vessel information including the position of the vessel; A thrust unit controlling the position of the vessel; A DP control unit outputting a control signal to the thrust unit based on the measured value input from the DP measurement unit; And an drift ice load predicting device for measuring drift ice to predict the load of the drift ice.

The drift ice load predicting apparatus may include a first measuring device configured to measure an upper portion of the drift ice on a sea level; A second measuring device for measuring a lower portion of the drift ice under the sea level; A database for storing loads of drift ice for each piece of drift ice including the size and type of drift ice; And a controller configured to determine the size and type of the drift ice using information of the upper and lower portions of the drift ice measured by the first and second measuring devices, and to predict the load of the drift ice based on the determined information of the drift ice and the database. It is preferable to include.

Preferably, the first measuring device is a laser measuring device, and the second measuring device is a sonar detector.

The controller determines whether the predicted load of drift ice exceeds a predetermined reference load, and if the load of drift ice is less than the reference load, provides the controller with notification information informing the ice ice of the drift ice, and the load of the drift ice is the reference load. If exceeded, it is desirable to provide notification information informing the avoidance of the drift ice.

In addition, according to another embodiment of the present invention, a method of estimating the drift ice load of the dynamic positioning system for maintaining the position of the vessel so that the current position of the vessel does not deviate from the target range, comprising: measuring the upper and lower portions of the drift ice; Determining the size and type of the drift ice using the measured upper and lower portions of the drift ice; And predicting a load of drift ice according to the determined size and type of drift ice by referring to a database storing loads of drift ice for each size and type of drift ice.

In addition, the drift ice prediction method of the dynamic position maintenance system according to another embodiment of the present invention, after the step of predicting, determining whether the estimated load of drift ice exceeds a predetermined reference load; And providing notification information informing the icebreaking of the drift ice when the load of the drift ice is less than the reference load, and providing notification information informing the avoidance of the drift ice when the load of the drift ice exceeds the reference load. It is preferable to further include.

In addition, according to another embodiment of the present invention, the first measuring device for measuring the upper portion of the drift ice located on the sea surface; A second measuring device for measuring a lower portion of the drift ice under the sea level; A database for storing loads of drift ice for each piece of drift ice including the size and type of drift ice; And a controller configured to determine the size and type of the drift ice using information of the upper and lower portions of the drift ice measured by the first and second measuring devices, and to predict the load of the drift ice based on the determined information of the drift ice and the database. An apparatus for predicting drift ice loads is provided.

According to an embodiment of the present invention, by predicting the load of drift ice, icebreaking or avoiding drift ice can reduce the possibility of ship breakage and sinking, and minimize down time in the sea.

1 is a block diagram illustrating a dynamic position maintaining system having an ice floe load predicting apparatus according to an embodiment of the present invention;
FIG. 2 is an operation flowchart illustrating a method of predicting drift ice loads of the dynamic position maintaining system illustrated in FIG. 1;
3 is a diagram illustrating an environment for implementing a method of predicting drift ice loads in a dynamic position maintaining system according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a dynamic position maintaining system having an ice floe load prediction apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the dynamic position maintaining system 100 includes a DP measurement unit 110, a DP control unit 120, a thrust unit 130, and an drift ice load prediction device 140. Dynamic positioning system 100 is characterized in that configured to be available in the polar region.

The DP measurement unit 110 includes an anemometer 111, a global positioning system (GPS) 112, a global navigation satellite system (GLONASS) 113, a gyroscope 114, and a fan beam ( Fan Beam) 115 and an acoustic sensor 116 are provided.

The anemometer 111 measures wind direction and wind speed and outputs an electrical signal corresponding thereto to the DP controller 120.

The GPS 112 measures the position of the ship and outputs an electrical signal corresponding thereto to the DP controller 120.

The GLONASS 113 measures the position of the ship and outputs an electrical signal corresponding thereto to the DP controller 120. The GLONASS 113 serves to correct the position measured by the GPS 112. In the general dynamic positioning system, GPS is used to measure the position of a ship, but in the polar region, GLONASS (113), which is a positioning system by Russian satellite, is used to compensate for the large error in the signal received from the satellite. .

The gyroscope 114 measures the heading angle of the ship and outputs an electrical signal corresponding thereto to the DP controller 120.

The fan beam 115 measures a relative position of the ship and outputs an electrical signal corresponding thereto to the DP controller 120.

The acoustic sensor 116 outputs data capable of calculating the reference point position of the ship to the DP controller 120.

In the present specification, a vessel includes an offshore structure that is used while floating at sea.

The drift ice load prediction apparatus 140 measures the upper and lower portions of the drift ice to determine the size (area) and type of the drift ice, and predicts the load of the drift ice using the determined drift ice information and the database 143.

The drift ice load prediction device 140 includes a first measuring device 141, a second measuring device 142, a database 143, and a controller 144.

Referring to FIG. 3, the first measuring device 141 is installed at an upper portion of the hull V to measure an upper portion of drift ice positioned on the sea surface S. Referring to FIG. The first measuring device 141 may be a laser measuring device. For example, the size and type of the upper portion of the drift ice may be measured by using the laser signal emitted to the upper portion of the drift ice by the first measuring device 141 and the reflected signal reflected back to the upper portion of the drift ice. The first measuring device 141 measures the size of the drift ice including the width, length, height, and thickness.

The second measuring device 142 is installed on the side of the hull (V) to measure the lower portion of the drift ice located below the sea level (S). The second measuring device 142 may be a sonar for measuring sound waves.

The size of the upper and lower portions of the drift ice measured by the first and second measuring devices 141 and 142 described above may be different.

The database 143 stores loads of drift ice in correspondence with drift ice information such as the size and type of drift ice. The type of drift ice may be WAX, SEMI WAX or SOLID.

The controller 144 determines the information of the drift ice, that is, the size and type of the drift ice by using the measurement information of the upper and lower portions of the drift ice measured by the first and second measuring instruments 141 and 142, and determines the information of the drift ice. The predicted load of drift ice is obtained from the database 143 described above.

The size of the drift ice is calculated using the width, length, height and thickness measured by the first and second measuring instruments 141 and 142, and the type of drift ice is measured by the first and second measuring instruments 141 and 142. It is determined using the hardness of the ice floe surface and the like. As the hardness of drift ice increases, the load of drift ice tends to increase. For example, a half-melted slush drift ice is smaller than a hard iceberg whose load or impact is strong even when it collides. Prediction of hardness load can be judged by ice tank model test.

The load of drift ice is predicted by the following formula (1).

[Equation 1]

Load of drift ice = 0.5 * resistance coefficient * density * size * speed ²

Here, the resistance coefficient is a predetermined value, and is databased as a value obtained by counting the force received by the ship according to the size, hardness, or condition of the drift ice.

Density is a density of drift ice that is predetermined.

Speed is the sum of the speed of the ship and the speed of the drift ice.

In addition, the controller 144 determines whether the load of the predicted drift ice exceeds a predetermined reference load, and provides notification information to avoid drift ice when the drift ice exceeds the reference load, and the load of the predicted drift ice is the reference load. If less than drift ice, it provides notification information indicating icebreaking. Accordingly, it is possible to minimize downtime by determining whether to avoid drift ice or crush ice while performing drilling or the like at a predetermined position, and to reduce the possibility of breakage and sinking of the ship.

The DP controller 120 includes a controller 121 and an operation console. The DP controller 120 generates an appropriate control signal and outputs it to the thrust unit 130.

The controller 121 outputs a control signal to the thrust unit 130 to maintain the fixed position of the ship based on the ship's position information and wind input from the DP measurement unit 110.

The controller 121 receives a command of an operator through the operation console 122. In the present embodiment, it will be described that the controller 121 is implemented as a programmable logic controller (PLC).

The thrust part 130 includes a propeller 131, a thruster 132, and a rudder 133.

The propeller 131 maintains the position in the front and rear direction of the ship, the thrust is controlled by the controller 121.

The thruster 132 maintains the position of the ship in the left and right directions, the thrust is controlled by the controller 121.

The rudder 133 adjusts the rotational direction of the ship and is controlled by the controller 121.

FIG. 2 illustrates a method of predicting drift ice in a dynamic position maintaining system having the drift ice load predicting device shown in FIG. 1. Now, with reference to Figures 1 and 2 will be described in detail the drift ice load prediction method according to an embodiment of the present invention.

According to an embodiment of the present invention, the method of estimating the drift ice load of the dynamic position maintaining system having the drift ice load estimating apparatus includes measuring an upper portion of the drift ice located above the sea level (S11), and measuring a lower portion of the drift ice ( S13), determining information of the drift ice (S15), and predicting the load of the drift ice (S17).

Measuring the upper part of the drift ice (S11) transmits a laser signal through the first measuring device 141 installed on the upper part of the hull and measures the upper part of the drift ice using the received reflected signal.

Measuring the lower portion of the drift ice (S13) transmits a sound wave signal through the second measuring device 142 installed on the side or the bottom of the hull and measures the lower portion of the drift ice by using the sound wave signal returned.

Steps S11 and S13 described above are not limited to the order, and may be implemented by measuring the upper and lower portions of the drift ice before the step S15 described later.

Determining information of the drift ice (S15) determines the size (area) and type of drift ice using the upper information of the drift ice and the lower information of the drift ice measured through the above-described steps S11 and S13.

Predicting the load of drift ice (S17) obtains the load of drift ice predicted to the information of the drift ice determined in the above-mentioned step S15 in the database 143 mentioned above. The database 143 stores load values based on experience for each piece of drift ice information. Therefore, the controller may search the database 143 for the load of the drift ice that matches the information of the drift ice.

The information of drift ice includes the size and type of drift ice. The size of the drift ice is calculated using the width, length, height and thickness measured by the first and second measuring instruments 141 and 142, and the type of drift ice is measured by the first and second measuring instruments 141 and 142. Determined using the hardness of the surface of the ice floe.

The load of the drift ice is estimated using the size of the drift ice, the hardness of the drift ice, and Equation 1 described above.

Thereafter, the controller 144 determines whether the estimated load of drift ice exceeds a preset reference load (S19).

As a result of the determination in step S19, when the estimated load of drift ice exceeds a predetermined reference load, the controller 144 provides notification information informing the DP controller 120 of the avoidance of drift ice (S21).

As a result of the determination in step S19, when the predicted load of drift ice does not exceed the preset reference load, that is, when the load of drift ice is less than the preset reference load, the controller informs the DP controller 120 of notification information informing the ice ice of the drift ice. Provided (S20).

Accordingly, when the drift ice comes, it is possible to predict the load of the drift ice to determine whether to avoid the drift ice or icebreaking, thereby minimizing the downtime of the vessel in which the dynamic maintenance system is installed, and reducing the possibility of damage and sinking of the vessel.

The present invention is not limited to the embodiments described above, and various modifications and changes can be made by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

100: dynamic positioning system 110: DP measurement unit
111: Anemometer 112: GPS
113: GLONASS 114: gyroscope
115: fan beam 116: acoustic sensor
120: DP controller 121: controller
122: operation console 130: thrust unit
131: propeller 132: thruster
133: rudder 140: drift ice load prediction device
141: first measuring device 142: second measuring device
143: database 144: controller

Claims (7)

A DP measuring unit having a plurality of sensors measuring vessel information including the position of the vessel;
A thrust unit controlling the position of the vessel;
A DP control unit outputting a control signal to the thrust unit based on the measured value input from the DP measurement unit; And
It includes a drift ice load prediction device for measuring drift ice to predict the load of drift ice,
The drift ice load prediction device,
A first measuring device disposed on an upper portion of the vessel and measuring an upper portion of the drift ice located above the sea level at an upper sea level;
A second measuring device disposed on a side of the ship and measuring a lower portion of the drift ice located below the sea level;
A database storing information on the load of drift ice for each drift ice information including the size and type of drift ice; And
The size and type of the drift ice are determined using information of the upper and lower portions of the drift ice measured from the first and second measuring devices, and the load of the measured drift ice is based on the determined information of the drift ice and information stored in the database. Dynamic positioning system including a controller to predict the. delete The method according to claim 1,
Wherein said first measuring device is a laser meter and said second measuring device is a sonar. The method according to claim 1,
The controller
It is determined whether the predicted load of the drift ice exceeds a predetermined reference load, and if the load of the drift ice is less than the reference load, it provides notification information informing the ice ice of the drift ice, and the load of the drift ice exceeds the reference load. And providing notification information informing the avoidance of the drift ice. A method of estimating drift ice loads in a dynamic positioning system that maintains a ship's position so that the ship's current position does not deviate from a target range.
Measuring the top and bottom of the drift ice;
Determining the size and type of the drift ice using the measured upper and lower portions of the drift ice; And
Predicting the load of the drift ice according to the size and type of the drift ice by referring to a database storing the load of the drift ice by the size and type of the drift ice,
The measurement of the upper portion of the drift ice, the first measuring device disposed on the upper portion of the vessel measures the upper portion of the drift ice located above the sea surface at the sea level,
The measurement of the lower portion of the drift ice, the floating ice load prediction method of the dynamic position maintenance system for measuring the lower portion of the drift ice that the second measuring device disposed below the vessel is located below the sea level. The method according to claim 5,
After the predicting step,
Determining whether the estimated load of drift ice exceeds a predetermined reference load; And
And providing notification information informing the icebreaking of the drift ice when the load of the drift ice is less than the reference load, and providing notification information informing the avoidance of the drift ice when the load of the drift ice exceeds the reference load. Ice floe load prediction method of the dynamic positioning system further comprising. A first measuring device disposed on an upper portion of the ship and measuring an upper portion of the drift ice located above the sea level at an upper sea level;
A second measuring device disposed on a side of the ship and measuring a lower portion of the drift ice located below the sea level;
A database storing information on storing loads of drift ice for each drift ice information including size and type of drift ice; And
The size and type of the drift ice is determined using information of the upper and lower portions of the drift ice measured by the first and second measuring instruments, and the load of the measured drift ice is based on the determined drift ice information and the information stored in the database. Drift ice load prediction device comprising a controller for predicting the.

Images