JPS60211316A - Detecting and displaying device for float information - Google Patents

Abstract

PURPOSE:To obtain precise float information on a float equipped with a tank by detecting a liquid level at plural positions and calculating and displaying the equivalent liquid level and the quantity of liquid in the tank and the inclination state of the float. CONSTITUTION:Electric output type detection parts 2A, 2B, 2C, and 2D which detect liquid levels at respective corners of the tank 1 are provided at the corners. A microcomputer 4 which receives detection signals from the respective detection parts 2A-2D is provided. Then, the detection signals from the detection parts 2A-2D are received and the float information such as the equivalent liquid level and the quantity of liquid in each tank and the inclination state of a ship body is calculated and displayed on the basis of the received signals. The ship body is provided normally with plural tanks 1, so the front-rear and right-left tilt angles of each tank are averaged and used as tilt angle of the ship body in respective directions; and differences between the ship body tilt angles and tilt angles of each tank 1 are regarded as predetermined permissible errors, and defective detection end data are excluded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a floating body equipped with a tank, and more particularly to a device for detecting and displaying floating body information such as the inclination state of the floating body, the liquid level in the tank, or the amount of liquid in the tank.

In general, floating bodies such as ships,9 working barges, floating docks, floating offshore structures, etc. have one can of fuel oil, one tank for water, drinking water, etc., as well as the draft, inclination, and stability of the floating body. There are multiple ballast tanks for adjustment and a piping system that connects these tanks.

Monitoring the liquid level in these tanks and making appropriate adjustments is extremely important from the standpoint of work efficiency and safety, so each tank is equipped with a liquid level detection device such as a sounding tube or manometer. It is provided.

By the way, in such conventional liquid level detection means, the liquid level is detected at one point on the cross section inside the tank based on an idea similar to that of a tank on land, and almost no special correction is performed.

That is, conventionally, a simple correction table based on the amount of inclination of the hull has only been prepared for cargo oil tanks of oil tankers.

However, normally floating bodies (hereinafter referred to as "hulls" as necessary)
) are inclined to varying degrees from front to back or from side to side, and depending on the position of the measurement point, there are not only large measurement errors, but also fragility that can lead to misunderstandings for boaters.

In most cases, as shown in Figure 1, the liquid level detection part 2 of the tank 1 is installed near the tank wall for easy installation, so even if the liquid level in the tank remains unchanged, Therefore, the liquid level changes by a-a' and b-b'. If the width of the tank on the cross section is calculated and the angle of inclination is θ, this amount of variation can be approximated as L sin θ.If L=20 (to) and θ=10 (degrees), the error is: ±L sinθ=±20・51n10°=±3
．． It can be as long as 47 (m).

In addition, considering the case where the measuring parts 2 and 2' are arranged symmetrically in two tanks 1.1' as shown in Fig. 2 (a) and (b), when the tank 1.1' is upright, When the liquid levels are the same, the indicators 3 and 3' indicate approximately equal liquid levels, as shown in Figure 2 (,), but when the ship is heeled to one side, the indicators 3 and 3' indicate approximately equal liquid levels.
As shown in Figure (1)), there are even cases where the liquid level in the lower tank 1' is indicated to be relatively high.

The present invention aims to solve these problems by making it possible to accurately detect floating body information such as the inclination state of the floating body, the liquid level in the tank, and the liquid volume in the tank, and also to analyze the detection results Made it possible to display
The purpose of this invention is to provide a floating body information detection and display device.

For this reason, the floating body information detection and display device of the present invention, in a floating body equipped with a tank, includes a detection means capable of detecting each liquid level at a plurality of positions in the same tank, and a detection signal based on the detection signal from the detection means. a calculation means for calculating the equivalent liquid level in the tank, the amount of liquid in the tank, or the inclination state of the floating body; The present invention is characterized by being provided with display means for displaying the liquid amount or the inclination state of the floating body.

Hereinafter, a floating object information detection and display device as an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a schematic diagram showing its schematic configuration, and FIG. 4 is a flowchart showing the flow of its processing.

As shown in Figure 3, a self-propelled or non-self-propelled transport vessel (1) An external floating body (hereinafter referred to as the "hull" as necessary), such as a working barge, floating dock, or floating marine structure, is equipped with tanks. (for example, a ballast tank) 1 is provided.

In order to correct fore-aft and lateral inclinations, each corner of the tank 1 is provided with electrical output type detection units (detection means) 2A, 2B, and 2C for detecting the liquid level at each corner.

2D is installed.

Although a plurality of tanks 1 are normally provided in the above-mentioned hull, only one tank is shown in FIG. 3 as a representative.

Further, a microcomputer 4 is provided that receives detection signals from each of the detection sections 2A to 2D. This microcomputer 4 includes a CPU (microprocessor) as well as
Input/output interfaces and memories such as RAM and ROM (
From a functional point of view, it has the following means.

That is, receiving detection signals from each detection unit 2A to 2°D,
Based on these signals, it has the function of a calculation means that calculates the equivalent liquid level of each tank, the amount of liquid in each tank, and the inclination state of the hull (hereinafter, these information may be collectively referred to as "floating body information"). are doing.

When calculating the above, the shape and dimensions of each tank (length, width, depth, position from the hull reference point, etc. of each tank) and the position of each detection unit 2A to 2D (from the reference point of each tank) are position, etc.) (hereinafter, these pieces of information may be collectively referred to as "coefficient information"), but it is assumed that such coefficient information is stored in advance in the memory within the microcomputer 4.

Furthermore, the floating object information output from the microcomputer 4 is transmitted to a CRT serving as a display means for displaying this floating object information.
output to a display (display device) 5 such as a liquid crystal panel or a printer (printing device) 6;
or printer 6, the above floating body information is output and displayed.

In addition to visually appealing displays such as letters and figures, the displays may also be auditory displays such as audio, and in this case, a speaker is used.

Further, reference numeral 7 in FIG. 3 designates an operation unit for inputting a measurement request signal to the microcomputer 4 or inputting a list of coefficient information to the microcomputer 4 when it is desired to measure floating body information. show.

By the way, there are several possible ways to use this device. In other words, the signal level is read from all the detection parts of each tank at fixed time intervals without the intervention of the person waiting for execution, and based on this input data and built-in data, the liquid level and the liquid level of each tank from the hull reference point are calculated. Possible cases include calculating the liquid volume and outputting it to the display device 5 or printing device 6 at all times, or measuring a specified tank or all tanks when an operator inputs a measurement request signal from the operation unit 7. It will be done.

The operation of this device will be explained below with reference to FIG.

First, when this device is started, the signals of all the detection sections connected to the signal input terminal are scanned and input, and the depth of each point is calculated by multiplying by a calibration coefficient (steps A1 and A2>).

Then, in step A3, four liquid levels are determined for each tank based on the above data.

In addition, when detecting the liquid level, in the case of a square tank,
Normally, a detection end (detection section) is arranged at each corner, but in the case of a cylindrical tank, the detection sections may be arranged at appropriate locations such as front, rear, left and right.

Furthermore, in this case, the four detection ends (detection sections) 2A to 2D do not necessarily need to be provided in the same tank 1. In this case, the missing data is supplemented using the angle of inclination determined from the detection end (detection section) of the other tank.

After that, for each of the front end and rear end of tank 1,
Determine the average liquid level on the left and right sides, and in the same way, determine the average liquid level on the left end and right end, and the inclination angles of front and back, left and right, and from these values, calculate the average liquid level of tank 1 (equal liquid level). (Steps A4 to A6).

Furthermore, in step A7, the amount of liquid in the tank is increased.

In other words, in a tank with a constant cross section such as a rectangular parallelepiped or a cylinder,
The volume is calculated by multiplying the base area by the liquid level.

In addition, if the cross-sectional area distribution is not uniform over the height of the tank, the volume is calculated by interpolating from a correspondence table of liquid level and liquid volume stored in the memory in advance.

Thereafter, in step A8, it is determined whether the above-mentioned detection has been performed for all tanks, and if No, the processing of steps A3 to A7 described above is repeated for all tanks to be measured.

After all the tanks are detected in this manner, the average of the front, rear, left and right inclination angles of each tank is determined, and this is taken as the inclination angle of the ship in each direction (step A'J).

Furthermore, the difference between this hull inclination angle and the inclination angle of each tank 1 is compared with a preset tolerance, taking into consideration detection accuracy, tank dimensions, liquid level fluctuations, hull motion, etc. (Step A
10. A11).

At this time, if a difference that exceeds this tolerance occurs, it is assumed that the error is due to a faulty accuracy of the detection end (detection section) in the tank that exceeds the tolerance, or an erroneous signal due to a disconnection of the signal line or poor insulation, etc. In this apparatus, defective detection end data is excluded from the original data to be processed. In other words, if No in step All, in step A12, from at least three detection ends of the corresponding tank, identify the defective detection end that is the cause of the abnormal inclination angle in the front, back, left and right directions,
After performing the process of identifying and invalidating the defective detection end, related data is corrected in step A13.

Correcting the related data in this case includes processing to treat the signal from the defective detection terminal as absent in the subsequent processing, and also to treat the tank value calculated using the erroneous data in the previous processing. This includes correction processing for average liquid level and inclination, as well as correction processing for hull inclination.

Through the above-described processing, the liquid level (equal liquid level) from the bottom of each tank and the inclination of the hull are reduced. Also, if necessary, from a reference point set on the hull (if equipped with an electrical output type draft gauge, the outer water surface can be taken as the reference point by inputting the signal from the draft gauge). The relative liquid level of the tank is also checked.

Thereafter, the liquid level (absolute liquid level and relative liquid level), liquid volume, inclination of the hull, and symbol number of the defect detection end of each tank are output to the printing device 6 or the display device 5 (step A1
4).

It should be noted that if a measurement instruction is input from the operation unit 7, which is composed of a pushbutton switch or a keyboard, the process immediately returns to step A1 via step A15, and the above-mentioned step 70- is repeated. In addition, the elapsed time from the previous measurement is accumulated, and if the operation unit 7 is not provided or if no instruction is input from the operation unit 7, step A1 is performed when the preset time is reached. Return to processing (step A15
．． A16).

In addition, when detecting the inclination in only one direction, the number of detection ends required for measurement is at least two points for one tank and one point for other tanks among all the tanks. Further, when detecting inclinations in two directions, one more point is required. However, in order to improve measurement accuracy and reliability, the larger the number of measurement points, the better.

As detailed above, according to the floating body information detection and display device of the present invention, in a floating body equipped with a tank, there is provided a detection means capable of detecting each liquid level at a plurality of positions in the same tank, and calculation means for calculating the equivalent liquid level of the tank, the amount of liquid in the tank, or the inclination state of the floating body based on the detection signal of the calculation means; and the equivalent liquid level of the tank based on the signal from the calculation means.

With a simple configuration including display means for displaying the liquid level in the tank or the inclination state of the floating body, there is an advantage that floating body information can be detected and displayed with high accuracy.

[Brief explanation of the drawing]

Figures 1 and 2 show conventional floating body information detection and display means. Figure 1 is a schematic diagram showing the fluctuation of the liquid level in the tank, and Figures 2 (a) and (+1) are both This is a schematic diagram for explaining the operation of the example of a pond, and Figures 3 and 4 show a floating body information detection and display device as an embodiment of the present invention, and Figure 3 is a schematic diagram showing its schematic configuration. 4 are flowcharts showing the flow of the process. DESCRIPTION OF SYMBOLS 1...Tank, 2A, 2B, 2C, 2D... Detection unit constituting detection means, 4...Microcomputer as calculation means, 5...Display device constituting display means, 6...
A printing device constituting the display means, 7... an operation section. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2 (a) (b) Figure 3

Claims (1)

[Claims] In a floating body equipped with a tank, there is a detection means capable of detecting each liquid level at multiple positions in the tank, and based on a detection signal from the detection means, the liquid level in the tank and the liquid in the tank are detected. calculation means for calculating the amount or the inclination state of the floating body, and receiving a signal from the calculation means to display the liquid level in the tank, the amount of liquid in the tank, or the inclination state of the floating body. 1. A floating body information detection and display device, characterized in that a display means is provided.