JP2758551B2 - Mooring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mooring a floating body such as a ship or a floating offshore structure.

[0002]

2. Description of the Related Art Conventionally, a floating body such as a large ship or a floating marine structure is often moored between a quay or a dolphin via a rubber fender. As the rubber fender, a material that absorbs the complicated movement of the floating body and reduces the force acting on the quay or the dolphin is used.

[0003] Incidentally, since the motion of the floating body exhibits a wide range of characteristics depending on the wave conditions in addition to the specification of the shape of the floating body itself, a fender suitable for the worst combination condition is selected, and the acting force generated at that time is taken into consideration. Dolphin and the like are designed.

[0004]

However, when the conventional mooring equipment is used, there is a problem that the cost of the mooring equipment is increased because the design conditions are very rare. Also, when mooring with conventional mooring equipment, humans on large vessels or floating marine structures often experience seasickness and the like.

The present invention has been made in view of such a problem, and an object of the present invention is to provide an inexpensive mooring device that reduces the sickness of humans on a floating body to be moored.

[0006]

Means for Solving the Problems In order to achieve the above-described object, the present invention provides a dolphin having a bottom fixed to the seabed, and a dolphin provided between a floating body and the dolphin, and an air spring provided therein. A fender, a power unit for taking compressed air in and out of an air spring inside the fender, a first sensor for detecting sea condition information, and a second sensor for detecting motion information of the floating body, Based on the oceanographic information detected by the first sensor, the amount of movement and response acceleration of the floating body with respect to the expected incident wave are obtained, and the optimal spring characteristics of the air spring are calculated. Calculating the appropriate air amount, and further correcting the spring characteristics of the air spring based on the actual swing amount of the floating body and the response acceleration detected by the second sensor, so that the air amount required for the optimal spring characteristics is corrected. Is calculated A control means for controlling a spring characteristic of the air spring by adjusting an amount of compressed air sent from the power unit.

[0007]

According to the present invention, since the acting force acting on the dolphin or the like can always be controlled to a minimum, the entire mooring device can be made compact and the cost can be reduced. In addition, by controlling the amount of movement of the floating body, the motion acceleration that causes seasickness can be reduced, and seasickness can be prevented.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram when the present invention is applied to a floating type cleaning plant. In FIG. 1, 1 indicates the sea surface, 3 indicates the sea floor, and 5 indicates a floating type cleaning plant. A dolphin 7 whose bottom is fixed to the seabed 3 is installed, and a fender 9 is provided between the floating cleaning plant 5 and the dolphin 7.

FIG. 2 is a diagram showing a model in the case where the floating type cleaning plant 5 is analyzed. Here, the fender 9 is a spring 9
a.

FIGS. 3 and 4 show a wave cycle, a horizontal displacement and a horizontal displacement when a wave is given to the floating cleaning plant 5 by changing the wave cycle while changing the spring constant of the spring 9a in the model as shown in FIG. It is a figure showing the relation of acceleration.

As shown in FIG. 3, depending on the combination of the cycle of the incident wave and the spring characteristics, the horizontal displacement becomes large, and large swinging occurs. Generally, the amount of the fluctuation and the force acting on the dolphin 7 are proportional.

As shown in FIG. 4, a large horizontal acceleration occurs depending on the combination of the cycle of the incident wave and the spring characteristics. When this horizontal acceleration causes seasickness and works or lives on a floating body, it is desired to set this acceleration to a level of 20 to 30 gal or less.

In consideration of the above, the mooring device according to this embodiment is configured as follows. FIG. 5 is a diagram illustrating a control system of the mooring device. A wave sensor 11 is provided on the seabed 3. The wave sensor 11 detects an offshore wave height, cycle, wave direction, and the like, and sends the information to the control system 13. The control system 13 drives the power unit 15 based on information sent from the wave sensors 11 and 25. The power unit 15 adjusts the amount of compressed air to be supplied to the fender 9.
Send to

The fender 9 has a configuration in which a rubber bellows 21 is provided between the upper surface plate 17 and the lower surface plate 19, and air is stored in the rubber bellows 21. The spring characteristics of the fender 9 are controlled by adjusting the amount of compressed air sent into the rubber bellows 21. 23 indicates an intermediate ring,
Reference numeral 25 denotes a sensor. The sensor 25 detects the amount of movement and the response acceleration of the floating cleaning plant 5. The upper plate 17 is provided on the floating cleaning plant 5 side, and the lower plate 19 is provided on the dolphin 7 side.

Next, the control operation of the mooring device will be described with reference to the flowchart shown in FIG. The wave height, period, and wave direction offshore are detected by the wave sensor 11 (step 60).
1), these information are sent to the control system 13 and the control system 13
Then, the amount of movement of the floating cleaning plant 5 against the expected incident wave,
The response acceleration is calculated (step 602), and it is determined whether or not to correct the spring characteristics of the fender 9 (step 603).
When correcting the spring characteristics, the optimum spring characteristics are calculated (step 604), and the amount of air required to obtain the spring characteristics is calculated (step 605). Step 603
If the spring characteristics are not corrected in step 601
Return to

On the other hand, the power unit 15 produces compressed air (step 606) and stores the compressed air (step 607). Then, the necessary amount of compressed air calculated in step 605 is supplied into the fender 9 (step 608). The sensor 25 measures the actual swing amount and response acceleration of the floating type cleaning plant (floating body) 5 in such a state (step 609), and sends the measured values to the control system 13.
The control system 13 determines whether to correct the spring characteristics of the fender 9 based on the actual measurement value sent from the sensor 25,
If so, the process returns to step 604; otherwise, the process returns to step 606.

That is, in this embodiment, the floating cleaning plant 5
A wave sensor 11 is installed on the offshore side of the sea, and the wave height, period, and wave direction of the incident wave are detected in advance, and the amount of fluctuation and the response acceleration of the floating cleaning plant 5 are adjusted to a predetermined level or less in accordance with this. The spring characteristics of the fender 9 can be changed.

Therefore, if the mooring device of this embodiment is used, the force acting on the dolphin 7 can always be controlled to a minimum, and the mooring device as a whole can be made compact and cost can be reduced. In addition, floating type cleaning plant 5 which causes seasickness etc.
The effect of the sway can be reduced.

In the above description, a floating type cleaning plant is taken as an example, but it goes without saying that the present invention is also applicable to mooring of other marine structures or ships. In addition, an electromagnet or the like can be used as the spring in addition to the air spring.

[0020]

As described above, according to the present invention, it is possible to provide an inexpensive mooring device with less seasickness of a person on the moored floating body.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a floating cleaning plant 5 moored by a mooring device according to one embodiment of the present invention.

FIG. 2 is a diagram showing a model for analyzing the response of the floating cleaning plant 5;

FIG. 3 is a diagram showing a relationship between a wave period and a horizontal displacement.

FIG. 4 is a diagram showing a relationship between a wave cycle and a horizontal acceleration.

FIG. 5 is a diagram showing a control system of the mooring device according to one embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the mooring device.

[Explanation of symbols]

 5 Floating type cleaning plant 7 Dolphin 9 Fender 11 Wave sensor 13 Control system Power unit 21 Rubber bellows 25 Sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B63B 21/00-21/50

Claims (1)

(57) [Claims] 1. A dolphin having a bottom fixed to the sea floor, a fender provided between a floating body and the dolphin, and an air spring provided therein, and an air spring inside the fender. the basis of the power unit to perform out of the compressed air, the first sensor and a second sensor for detecting the motion information of the floating body, oceanographic phenomena information detected by said first sensor for detecting the sea conditions information
Of the floating body to the expected incident wave
Determine the speed, calculate the optimal spring characteristics of the air spring,
Calculate the amount of air required for the optimal spring characteristics, and
The actual swing amount of the floating body detected by the second sensor;
Correct the spring characteristics of the air spring based on the response acceleration
Calculate the amount of air required for optimal spring characteristics,
-Adjust the amount of compressed air sent from the unit.
Control means for controlling the spring characteristics of the air spring by means of
And a mooring device comprising: