JPH11115884A - Draft compensating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the draft data of a position, in which a draft gauge fails, by computing the draft of a position, in which measurement by a measuring means is impossible, on the basis of the measurement value, and automatically performing the backup computing of the failed draft gauge. SOLUTION: In the case where the heal data (S/P direction) can be manually input, and in the case where abnormality of a sensor of any one of a port and a starboard is detected, a heal data is input to a system so as to compute the draft of one side, which shows abnormality. In the case where draft of three points among four points can be detected, a flat surface including the four points is computed on the basis of the three points, and position of the draft part is computed on the basis of the computed flat surface. Furthermore, in the case where two points of four points (any one of a bow and a stern and any one of a port and a starboard) can be detected, draft of one side is obtained by manual input of the heal so as to detect three points, and a residual draft (any one of the bow and the stern) can be computed by using a formula for obtaining a flat surface on the basis of the three points. In the case where the heal data can not be manually input, and in the case where the draft data of three points can be detected, the residual one draft can be computed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft compensation system applied to a cargo handling control device for a tanker.

[0002]

2. Description of the Related Art A draft gauge applied to a conventional cargo handling control device of a tanker is attached to a bow, port, stern, and starboard (a left / starboard sensor may be substituted for an inclinometer (trim / heel meter)). Data is taken from each sensor and displayed on an analog gauge or a CRT display.

[0003]

When a draft meter of this type is used, if a draft meter at the bow or stern is broken, the draft is read by actual measurement, or manual calculation is performed using a sensor that can be used on the spot. And was labor intensive and lacked reliability.

[0004] It is an object of the present invention to provide a draft compensation system that obtains draft data of a location where a draft meter has failed by automatically performing backup calculation of a failed draft gauge.

[0005]

In order to solve the above-mentioned problems and achieve the object, a draft compensation system according to the present invention is configured as follows. The draft compensation system according to the present invention includes a draft meter individually arranged on the bow, stern, port and starboard of the target ship, or a draft meter individually arranged on the bow and stern of the ship, and a centrally located draft meter on the ship. Measuring means comprising an inclinometer unit disposed on the vehicle, and calculating means for calculating a draft at a location where measurement by the measuring means is impossible based on the measurement value obtained by the measuring means. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 is a diagram showing a configuration of a control system device in a tanker draft compensation system according to a first embodiment of the present invention. In this apparatus, a host CPU 1 which is an arithmetic unit includes, via an input / output unit (sequencer) 2, sensors (not shown), a pressure transmitter unit 3, a liquid level / draft measurement unit 4, and a valve remote control operation device 5, Transfer information.

FIG. 2 is a diagram showing an example of a four-point draft gauge attached to the tanker. As shown in FIG. 2, in the installation of the four-point draft gauge, the draft gauges A to D are respectively mounted on the bow, stern, and port and starboard of the midship.

FIGS. 3 and 4 are flow charts showing a draft correction procedure by the CPU 1 of the control system. First, in step S1, the four-point data is not normal,
If the one-point data is not abnormal in step S2 and if the two-point data is abnormal in step S3, 4
It is determined which of the points is abnormal.

Here, the port and port side are abnormal, and step S
If there is manual input of heel data in step 5, in step S6,
Calculate draft from average draft and heel data. If there is no manual input of the heel data in step S5, since the draft correction cannot be performed as shown in step S7, the process ends. If the bow and stern sides are abnormal in step S4, the processing ends because the draft correction cannot be performed as shown in step S7.

If it is determined in step S4 that one of the left and right ports and the bow and stern side are abnormal, if there is no manual input of the heel data in step S8, the draft correction cannot be performed as shown in step S7. The process ends. If there is manual input of the heel data in step S8, step S8
In step S9, the heel data is manually input. In step S10, the draft of the abnormal part on the left and right sides is calculated. In step S11, the draft is calculated from the data of the three points using the plane formula. The heel (S / P) data is data that can be obtained from a trim / heel meter, and can be automatically obtained.

On the other hand, if the one-point data is abnormal in step S2 and either of the left and right ports is abnormal in step S12, it is determined in step S13 whether or not a heel hand input has been made. If there is a heel hand input here, step S1
In step S4, the heel data is manually input, and in step S15, the draft of the abnormal part is calculated from the heel data.

If there is an abnormality in the bow and stern at step S12, a draft is calculated from the remaining three points by a plane formula described later in step S16. If the two-point data is not abnormal in step S3, the draft correction cannot be performed as shown in step S7, and the process ends. If the four-point data is normal in step S1, the process ends.

The use of the plane formula will be described below. The three draft positions where the measured values are known can be expressed as D1 (x1, y1, z1), where the vertical direction is the x axis, the horizontal direction is the y axis, and the height direction is the z axis.
1), D2 (x2, y2, z2), D3 (x3, y3,
z3), and a plane including these three points is given by the following equation (1).

[0014]

(Equation 1) At this time, the remaining draft D4 (x4, y4, z4
Since the positions to be measured in (2), that is, x4 and y4, are known, they are substituted into equation (1), the remaining z4 is calculated, and the draft D4 is obtained.

Usually, in order to grasp the state of the hull, a draft gauge (or inclinometer) is provided as shown in FIG. 2, and the data is transmitted from each unit to the host CPU 1 via the input / output unit 2. take in. Hull attitude control is performed using this data. When a sensor failure occurs, a backup calculation according to the failure location is performed as shown below.

FIG. 5 is a diagram showing the specifications of the backup calculation when the heel (S / P inclination) is manually input when four draft gauges (bow, stern, port, starboard) are provided.
FIG. 6 is a diagram showing the specifications of the backup calculation when there is no manual input when four draft gauges are installed (bow, stern, port, starboard).

When the heel data (S / P direction) can be manually input, as shown in FIG. 5, when the sensor on one of the ports, port or starboard, is abnormal, the heel data is obtained by the system, and Calculate the draft on one side indicating If three of the four drafts are known, a plane including the four points is determined from the three points, and the position of the draft portion is calculated from the plane.

Further, if two of the four points (either the bow or stern and the port or starboard) are known,
The draft on one side is obtained by manual input of the heel, and three points are obtained. From these three points, the remaining draft (bow or stern) is calculated using the above-described formula of the plane. If the heel data cannot be manually input, as shown in FIG. 6, if the three points of draft data are known, it is possible to calculate the remaining one point of draft.

(Second Embodiment) FIG. 7 is a diagram showing a configuration of a control system device in a tanker draft compensation system according to a second embodiment of the present invention. In this apparatus, a host CPU 1 which is an arithmetic unit includes sensors (not shown), a pressure transmitter unit 3, a liquid level / draft measurement unit 4, a valve remote control operation device 5, and an inclination unit (not shown) via an input / output unit (sequencer) 2. The exchange of information with the total unit 6 is performed.

FIG. 8 is a diagram showing an example of mounting a two-point draft gauge. In the two-point draft gauge installation, as shown in FIG. 8, the draft gauges A and B are attached to the bow and stern of the hull, respectively. Further, an inclinometer E (trim / heel meter) is attached instead of the port and starboard draft gauges.

FIG. 9 is a flowchart of a backup calculation in a case where two draft gauges (bow and stern) and an inclinometer (trim / heel gauge) are provided. First, in step S1,
It is determined whether or not the draft meter is normal. If it is abnormal, it is determined in step S2 whether or not the inclinometer is normal. If it is abnormal, backup is disabled in step S5. Even if the inclinometer is normal in step S2, if both of the draft meters (both bow and stern) are abnormal in step S3, backup is disabled in step S5. If the draft gauge is normal at one point (bow or stern) in step S3, an abnormality is detected in step S4 based on the vertical inclination of the hull obtained from the normal one-point draft meter and inclinometer. Calculate the draft of the part.

FIG. 10 is a diagram showing the specifications of the backup calculation when two draft meters (bow and stern) and an inclinometer (trim / heel meter) are provided. In this case, if the trim meter E is normal, of the bow or stern draft,
Even when any one point is abnormal, it is possible to calculate the draft of the remaining one point. In the above case, by providing a draft calculation function, the reliability of control can be improved even if the draft meter or the trim / heel meter fails.

The present invention is not limited to the above embodiments, but can be modified as needed without departing from the scope of the invention. (Summary of Embodiment) The configuration, operation and effect shown in the embodiment are summarized as follows.

In the draft compensation system shown in the embodiment, the draft gauges A to D individually arranged on the bow, stern, port and starboard of the target ship, or individually arranged on the bow and stern of the ship. Measuring means (4, 6) comprising draft meters A, B and an inclinometer unit E individually arranged at the center of the ship
And a calculating means (1) for calculating a draft at a location where measurement by the measuring means (4, 6) was impossible based on the measurement value obtained by the measuring means (4, 6). Have been.

As described above, in the above-mentioned draft compensation system, the backup calculation of the failed draft gauge is automatically performed, so that the operator does not have to perform the backup calculation, and the draft gauges A to D can be used even when the equipment is abnormal. Alternatively, the draft data and the trim / heel value of the location where the inclinometer unit E has failed can be easily known without hindering the control, and the overall reliability of the system can be improved and the cost can be reduced.

[0026]

According to the draft compensation system of the present invention, the backup calculation of the failed draft gauge is automatically performed, so that the operator does not have to perform the backup calculation. The draft data and the trim / heel values of the location where the inclinometer unit has failed can be easily known without hindering the control, and the overall reliability of the system can be improved and the cost can be reduced. That is, by automatically performing the backup calculation of the failed water gauge, it is possible to provide a draft compensation system that obtains draft data of a location where the water gauge has failed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a control system device in a tanker draft compensation system according to a first embodiment of the present invention.

FIG. 2 is a diagram relating to a draft compensation system for a tanker according to the first embodiment of the present invention, showing a mounting example of a four-point draft gauge on the tanker.

FIG. 3 is a flowchart showing a draft correction procedure of a control system device in the draft compensation system according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing a draft correction procedure of a control system device in the draft compensation system according to the first embodiment of the present invention.

FIG. 5 illustrates a heel (S) when four points (bow, stern, port, starboard) are provided with the draft meter according to the first embodiment of the present invention.
FIG. 10 is a diagram showing the specifications of backup calculation when (/ P slope) is manually input.

FIG. 6 is a diagram showing specifications of backup calculation when there is no manual input when the draft gauge according to the first embodiment of the present invention is equipped with four points (bow, stern, port, starboard).

FIG. 7 is a diagram showing a configuration of a control system device in a tanker draft compensation system according to a second embodiment of the present invention.

FIG. 8 is a diagram related to a draft compensation system for a tanker according to a second embodiment of the present invention, showing a mounting example of a two-point draft gauge in the tanker.

FIG. 9 is a flowchart showing a draft correction procedure of a control system device in a draft compensation system according to a second embodiment of the present invention.

FIG. 10 shows a draft meter according to a second embodiment of the present invention.
The figure which shows the specification of the backup calculation when equipped with a point (bow, stern) and an inclinometer (trim / heel meter).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Host CPU 2 ... Input / output unit 3 ... Pressure transmitter unit 4 ... Liquid level / draft measurement unit 5 ... Valve remote control operation device 6 ... Inclinometer unit A-D ... Draft gauge E ... Inclinometer

Claims (1)

[Claims] Claims: 1. A water gauge which is individually arranged on the bow, stern, port and starboard of a target ship, or a water gauge which is individually arranged on the bow, stern of the ship and a central part of the ship. Measuring means comprising an inclinometer unit; and calculating means for calculating, based on the measured value obtained by the measuring means, a draft at a point where measurement by the measuring means was impossible. Draft compensation system.