SU1586953A1 - System for determining metacentric height of a ship - Google Patents

Abstract

This invention relates to the technical means of monitoring ship stability. The purpose of the invention is to improve the accuracy of determination. The system contains landing sensors 1, roll angle sensors 2 and torsional moment sensors 3, the outputs of which are connected via analog-digital converter 4 and parallel interface 5 to unit 6 for generating metacentric height values, computing unit 9 and tangent subsystem 12, switch 8, block 7 quality assessment, comparator 11, electronic key 10 and counter 13. 4 Il.

Description

This invention relates to the field of technical means for monitoring ship stability.

Purpose of the Invention — Improving Accuracy. In FIG. 1 shows a block diagram of the proposed system; in fig. 2 - quality assessment unit; in fig. 3 - computing unit; in fig. 4 - subsystem.

The metacentric height determination system contains landing sensors 1, roll angle sensors 2, heeling torque sensors 3, the outputs of all sensors through analog-digital converter 4 and the parallel interface 5 are connected to the inputs of the metacentric height forming unit 6, the output of which is connected to the first input unit 7 quality assessment and through the switch 8 to the computing unit 9.

The first output of the quality assessment unit 7 is connected via an electronic terminal to the 1st unit 10 to the computing unit 9, the second and third outputs of the quality assessment unit 7 are connected to the first and second inputs of the comparator 11, respectively, the first output of which is connected to the control input of the electronic unit.

key 10, and the second output to the third input of the quality assessment unit 7, the second input of which is connected to one output of the subsystem 12, the other output of which is connected to the control input of the switch 8 through the counter 13.

The quality evaluation unit 7 (Fig. 2) contains a single vibrator 14, which is connected to a reversible counter 15, an operational amplifier 16 that calculates a value of 0.02 (/ icp + l), a storage unit 17, the first input of which is the first input of unit 7 quality assessment and connected to the second input of the reversing counter 15, the second input is connected to the one-shot 14, and the outputs are connected to the n outputs of the first adder 18 (n is the number of measurements), which through the first divider 19 is connected to the input of the operational amplifier 16, the sync generator 20 whose input is torym input quality estimation unit 7 and output connected to one input of a serial-parallel converter 21, the other n inputs are connected to the n outputs of the memory unit 17 respectively, and the output is yuschiys first exit (A

01

00

about with

SP

00

the house of the quality evaluation unit 7 is connected in series with the first inverter 22, the second adder 23, the second divider 24 the second inverter 25 and the third adder 26, the second input of which is connected to the output of the first divider 19, and the output is the second output of the block 7, which is connected to the input of the comparator 11. The input of the one-vibrator 14 is the third input of the unit 7, quality assessment and connected to the output of the comparator j II, one output of the reversible counter i is connected to the second input of the second de; Hotel 24, and the other with the second input; the second divider 19, the output of the operational force; The module 16 is the third output of the quality evaluation unit 7.

In the computing unit 9 (Fig. 3), the data input unit 27 is sequentially connected to the memory unit 28, initial value unit 29, comparison unit 30, to another input of which the output of the measured value unit 31 is connected, and the output is connected through the reader 32 to the unit 33 conclusions.

The tilting subsystem 12 of the vessel (Fig. 4) consists of a torsion roll unit 34 connected in series, a signaling device 35, a tilting control unit 36, a ballast pump 37. The second output of the tiller 35 is the second output of the tipping subsystem 12 and connected the output of the tilting control unit 36 is the first output of the tapering subsystem 12 and connected to the input of the clock generator 20 in the quality evaluation unit 7. The bank control unit 36 is designed to turn on and off the ballast pump 37, as well as to issue a signal about the end of a series of measurements for starting the generator of 20 clock pulses. It contains turn-on tumblers and indicator lights. The detector 35 is designed to emit signals to the counter 13 for counting the number of roll tests carried out, as well as to indicate the tilt parameters.

The execution of the block 6 for forming a metacentric height 6 can be a device for calculating elementary functions. In block 6, the value of the metacentric height of the vessel is formed in accordance with the formula

/ z Ш6

where L is metacentric height (m);

N is the moment of momentum (tm);

D is the displacement of the vessel (t);

© - increment of roll angle.

The system works as follows.

With the help of the tilt system 12, the user tilts the vessel. From the landing sensors 1, the heel angle 2 and the heeling moment 3, the signals through analog-digital converter 4 and the parallel interface 5 enter the block 6 of forming the values of the metric centric height, where the values of the metric centric height are formed in accordance with the formula L

jVl

sha

where are they from

0

arrive at the first input of the quality evaluation unit 7 and the switch 8. At the same time, a signal arrives from the tangent subsystem 12 to the meter 13. The counter 13 counts the number of measurements up to two, and the signal from its output goes to the control input of the switch 8.

During the first trial of a ship roll (first measurement) through the switch 8, the signal h from the metacentric height forming unit 6 is fed to the input of the computing unit 9 and to the first input of the quality evaluation unit 7.

When conducting a series of krenowing (measurement) experiments with the amount of the counter 13, it sends a control pulse to the switch 8, which disconnects the input of the computing unit 9 from the output of the unit 6 forming the value of metacentric height and

5 values of the metacentric height h, - from the block 6 of forming the values of the metacentric height only arrive at the first input of the quality assessment unit 7. In the latter, the recorded measurement results are recorded, the generation of the value A -

0 deviations of the arithmetic mean of the full range of measurements of h from the arithmetic mean of the range of measurements that do not contain the measurement in question and the value of I - the maximum deviation of / 1 "en from / g for a qualitative result. These signals

5 come from the outputs of the quality evaluation unit 7 to the corresponding inputs of the comparator 11, in which they are compared. In the case of the quality of the considered value of the metacentric height,

Q, i.e., when the maximum deviation P is larger than the deviation D, the second output of the comparator 11 receives a control signal to the electronic key 10, which transmits the considered value of the metacentric height from the first output of the evaluation unit 7

5 quality to the input of the computing unit 9 for use in further calculations of the characteristics of stability. Otherwise, the comparator 11 generates a rejection signal of a poor-quality result, which from its second output goes to the third input of the quality assessment unit 7, where the result is erased and the number of measurements n is reduced by one, after which the quality assessment unit 7 is repeated from the beginning.

The block 7 for evaluating the quality of the results of the experiment on banking works as follows. After each test has been carried out on storage unit 17 from unit 6, the formation of metacentric values

heights the results of each definition of the metacentric height A are received, and are remembered. At the same time, the results are fed to a reversible counter 15 of the number of measurements, in which the number of experiments performed is calculated.

From the outputs of the storage unit 17, the values of the metacentric height arrive at the inputs of the first adder 18, in which the value of the sum of the results is generated.

measurement of 2 / g, which comes from you

the progress of the first adder 18 to the input of the first divider 19, to the second input of which comes from the reversible counter 15 the value of the number of measurements made. In the first divider 19, the value of the arithmetic average of the results of the OPG 2/1 / definition of the metacentric height is generated,

the input to the operational amplifier 16, the output of which establishes the value, 02 (h +) is the limit value for the qualitative result of the deviation, the arithmetic average of an incomplete number of measurement results (without the result being considered) from the arithmetic average of the full range of measurement results comparator input 11.

At the end of the series of experiments on the inclining of the vessel from the subsystem 12, a triggering pulse arrives at the generator input 20 of the clock pulses. The generator 20 of clock pulses begins to generate pulses that synchronize the operation of the parallel-serial converter -21, transmitting alternately the values of metacentric height / g, from the storage unit 17 to the inputs of the first inverter 22 and the electronic switch 10 (first output of unit 7). From the output of the first inverter 22, the signal is fed to the input of the second adder 23, at the second input of which there is already a set value of

n results S / i, from the output of the first sum I

torus 18. From the output of the second adder 23, the signal S / z-h is fed to the input of the second divider 24, the second input of which already has the established value n-1 (where d is the number of measurements supplied from the output of the reversible counter 15). From the output of the second divider 24, the value of the arithmetic mean of an incomplete series of measurement results (without the result being considered) through the second inverter 25 GF2 2 h-hi

Lnep

It is connected to the third adder 26, on the second input of which there is already an established value of L. In the third adder. 26, the signal of the difference L — A “ε D D is produced. Arriving at the second input of the comparator 11

(second output of block 7) for comparison with the value of P received at the first input from operational amplifier 16.

If d P (poor quality result) comparator 11 produces

a signal arriving at the input of one-vibration 14, giving out a single pulse, arriving at the input of erasing the storage unit 17 for erasing a poor-quality result from the memory and for reversing the input of the reversible counter 15 for decreasing its contents by one. After this, the process of finding and discarding poor-quality results is repeated, and for a full series of results, a series is taken that was incomplete in the previous cycle.

(i.e., without a / -th poor-quality result).

Claims (1)

Invention Formula The system for determining the metacentric height of the vessel, containing landing sensors and roll angle, interface, metacentric height forming unit, heeling subsystem and computing unit, characterized in that, in order to increase accuracy, the system is equipped with a heeling moment sensor, a converter, quality assessment, a comparator, a switch, an electronic switch and a counter, while landing sensors, heel angle and heeling moment are connected via a converter and an interface to a metacentric height forming unit whose output is connected to the first input of the quality assessment unit, and the second input is from the output of the subsystem, the first output of the quality assessment unit is connected via an electronic key to the computing unit, the first and second inputs of the comparator are connected to the second and third outputs of the quality assessment unit a, a switch connected between the output values of the forming unit and the input of metacentric height calculation unit, counter connected between the second output of the subsystem and the control input of the switch. j; L 29 3 27 28 (Riga.Z 35 - ; j Fi8.