JPH01168589A - Active control type weather vaning device - Google Patents

Abstract

PURPOSE:To make the bow turnable to a wave direction all the time by making a radar device possible to catch the wave direction accurately even if with direction and the wave direction differ each other. CONSTITUTION:A radar device 1 installed in the hull is designed so as to make a main direction of waves findable with a radar screen image. This radar screen image found by the radar device 1 is fed to a controller 3 which rotates a turret 11 with a driver 2 so as to cause the bow to be turned to the main direction of waves. With this constitution, weather vaning is made surely performable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a weather vening device that has come to be employed in a ship-type oil drilling rig and the like.

[Conventional technology]

In ship-type oil drilling rigs, etc., when the rolling becomes large,
Drilling work, oil/water separation work, etc. will no longer be possible, resulting in a drop in rig operating rate. Therefore, a so-called weather vaning system has been adopted as a means to overcome such problems.

This weather vening system takes advantage of the fact that the wave direction is close to the wind direction, and uses JR's positive pressure to rotate the hull around the turret, creating a head-on wave condition.

In other words, the bow is directed toward the main direction of the waves, and rolling is reduced by passive operation of utilizing wind pressure.

[Problem that the invention seeks to solve]

However, this system is like a swell.

If the waves are not generated in the area where the ship is located, the direction of the wind and the direction of the waves will not necessarily match, and the effect will not be as high.

Also, to rotate the hull using wind pressure.

This creates design limitations such as having to install the turret near the bow to 1/4 of the bow to minimize the moment of one rotation.Furthermore, when the wind pressure is weak, the rotational friction force of the turret is greater and the weather In some cases, the effect of veneing may not be improved.

The present invention has been made to overcome the above-mentioned problems of the prior art, and is to develop a new weather vaning device that performs active control to efficiently perform the weather vaning described above.

[Means for solving problems]

Therefore, as shown in FIG.
) and a drive device (2) that rotates the turret α9 vertically penetrating the hull a [in a state where it can rotate once;
The basic feature is that it has a control device (3) that controls the drive of the drive device (2) so that the main direction of waves captured by the radar device (1) coincides with the bow of the ship.

In this device, the radar device (1) determines the main direction of waves using radar images, and based on this radar image, the control device (3)
turret α1) so that the bow faces the main direction of the waves.
By rotating it with the 8ffi motion device (2), the above-mentioned weather vaning can be performed reliably.

゛The configuration of the above-mentioned radar device (1) includes the following: ・As shown in Japanese Patent Laid-Open No. 60-22680, logarithmic detection output of received waves is used in a marine pulse radar. obtained from. Signals from sea surface reflections, which are unnecessary for radar, are converted from analog to digital.

The range of the first screen and the range of the next screen of the data obtained every time the radar antenna is converted from the polar coordinate system to the orthogonal coordinate system is between the data within the range of 5 wavelengths to 1 wavelength of the waves on the front, back, left and right sides. The digital calculation of two-dimensional cross-correlation is F
The wave direction and relative speed to the ship are determined from the amplitude and phase information of the spectrum calculated by FT. FIG. 2 is a block diagram showing such a radar device (1).

(101) is the radar antenna, (102) is the transmitter, (1
03) is a logarithmic amplification receiver, (104) is an A/D conversion circuit, (105) is a gate setting circuit, (106) is a correction circuit, (107) is an XY conversion circuit, (108) is a two-dimensional processor, ( 109) is an output circuit. Then, for the received signal from the waves, a gate circuit (105) is used to detect one wavelength for long wavelengths and five wavelengths for short wavelengths.
The AD conversion circuit (104) converts the data in the wavelength range, the correction circuit (106) converts the signal into a linear characteristic with -like strength, and the XY conversion circuit (107) converts the polar coordinate data into rectangular coordinates. do. By the two-dimensional processor (108),
Fourier transform is performed on the data obtained for each rotation of the radar antenna, and the direction and velocity are determined from the distribution of the amplitude spectrum and phase spectrum obtained by cross-correlation of the two screens of the wave signal, and the output circuit (109) outputs the information to the control device. (3) Output.

In addition, since oil field gas is combusted in the Grand Flare α2 of the hull (11), it is desirable to effectively use the exhaust heat energy as a power source for the drive device (2). It is preferable to generate electricity with a turbine generator and use it as part of the electric power of the drive device (2).

〔Effect of the invention〕

According to the weather vaning device of the present invention, even when the wind direction and wave direction are different, the radar device accurately captures the wave direction, so the bow can be directed in the wave direction.
Furthermore, since the turret is rotated by a drive device, weather vaning that reduces rolling can be reliably performed even when the wind is weak.

Furthermore, since the waste heat energy of oil field gas is used as a power source for the drive device, it is expected to improve energy savings.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an outline of the configuration of the present invention, and FIG. 2 is a block diagram showing the circuit configuration of a radar device. In the figure, (1) is the radar device, (2) is the drive device, and (3)
is the control device, (1G is the hull, (11) is the turret, α
2 each indicates a ground flare. Patent applicant Nippon Kokan Co., Ltd. Inventor Nori Kamimiya Daido
Sho Yoshihara, Patent Attorney, Patent Attorney, Setsu En Michi, Figure 3, Figure 1

Claims (1)

[Scope of Claims] 1. A radar device that captures the main direction of waves, a drive device that rotates a turret that vertically penetrates the hull in a rotatable state, and a radar device that captures the main direction of waves captured by the radar device. 1. An active control type weather vaning device comprising: a control device that controls driving of a drive device so that the direction and the bow of the ship match. 2. A radar device that captures the main direction of the waves, a drive device that rotates the turret that vertically penetrates the hull in a freely rotatable state, and the main direction of the waves captured by the radar device that matches the bow of the ship. In an active control type weather vaning device having a control device for controlling the drive of the drive device, exhaust heat energy of oil field gas being combusted by a ground flare of the hull is used as a power source for the drive device. An active control weather vaning device featuring: