WO2018218836A1

WO2018218836A1 - Method for handling through-chambers when calculating watercraft damaged stability

Info

Publication number: WO2018218836A1
Application number: PCT/CN2017/104145
Authority: WO
Inventors: 薛林; 周静
Original assignee: 广船国际有限公司
Priority date: 2017-05-27
Filing date: 2017-09-29
Publication date: 2018-12-06
Also published as: CN107140114A

Abstract

A method for handling through-chambers when calculating damaged stability of a watercraft: virtually dividing a through-chamber (100) into multiple small chambers (101, 102, 103, 104) along a width direction of the through-chamber (100), and assuming water enters the multiple small chambers 101, 102, 103, 104) sequentially, until the watercraft achieves an equilibrium state. In this manner, when calculating damaged stability, it is only necessary to monitor a state of water entering the multiple small chambers (101, 102, 103, 104) when the watercraft achieves an equilibrium state, ensuring that a righting arm can have a positive value at each state, and it is not necessary to consider an overall state, avoiding analysis and monitoring of a great many intermediate states, saving calculation time and increasing calculation efficiency.

Description

Method for processing through compartments in calculation of ship damage stability

Technical field

The invention relates to the technical field of ships, and in particular relates to a processing method for penetrating a cabin when calculating the stability of a ship.

Background technique

Damage stability means that the ship can maintain a certain degree of buoyancy and stability after being damaged by water in a cabin or adjacent multi-cabin, so that the ship will not sink or delay the sinking time and ensure the safety of personnel and cargo. In the ship design phase, the assessment of damage stability is very important.

In terms of the calculation and criteria of ship damage stability, it can be divided into two methods: deterministic method and probabilistic method. The deterministic method refers to calculating the residual ship of the ship under the premise of determining the location and extent of damage of the ship. The method of capability; the probabilistic method refers to the method of calculating the residual capacity of the ship based on the statistical data of the ship's damage caused by a large number of collisions and stranding accidents. With the popularity of computers and the continuous improvement and maturity of computational methods, probabilistic methods are expected to gradually replace deterministic methods.

At present, for the calculation of the damage stability of special ships (passenger ships, deck transport ships, etc.), it is necessary to analyze the damage stability according to the probabilistic method. As shown in Figure 1, the bottom compartments of these ships are generally designed with a through compartment 100 that runs through the left and right sides. In general, for the through compartment 100, when the ship's one side is damaged during the calculation of the damage stability, it is necessary to calculate the time required for the water to flow from one side to the other side until the ship reaches the equilibrium state after entering the water, and to the ship. The intermediate state from the influent to the equilibrium is monitored to ensure that the return arm of the vessel is positive during the entire influent state.

The above-mentioned calculation method for the through-chamber is disadvantageous in that it is necessary to additionally define a communication hole between the through-chambers 100 to calculate the time required for the through-chamber 100 to flow from the water inlet until the ship is balanced; The process is monitored throughout the process, and thousands of calculations are generated throughout the process. The working condition corresponds to a restoring force arm. During the analysis, the results of the above-mentioned thousands of working conditions need to be analyzed one by one, and at the same time, the working condition that does not contribute to the subdivision index needs to be removed, so the workload is huge; It takes a long time to calculate and consumes a lot of energy.

Summary of the invention

The object of the present invention is to provide a method for processing a through-chamber in the calculation of the stability of a ship to solve the problem of the prior art, and to define the through-hole of the cabin, and to have more intermediate states and long calculation time. The problem.

To this end, the present invention employs the following technical solutions:

A method for processing a through-chamber in the calculation of ship damage stability, virtually dividing the through-chamber into a plurality of small cabins along the width direction of the through-chamber, and assuming that the plurality of small tanks sequentially enter water in sequence until the ship reaches equilibrium status.

Preferably, the number of said capsules is four.

Preferably, the distribution of the four compartments is as follows:

The left side of the ship's side is the first small compartment, the right side of the ship's side is the fourth small compartment, and the part between the left side of the ship and the right side of the ship is divided into a second small compartment and a third small compartment.

As a preference:

The water inflow process of the first small tank is: starting from the occurrence of the first small tank water inflow, until the first small tank enters the water and the ship reaches an equilibrium state;

The water inflow process of the second small tank is: starting from the occurrence of the water in the second small tank, until the water reaches the equilibrium state after the water entering the second small tank;

The water inflow process of the third small tank is: starting from the occurrence of the water in the third small tank, until the water reaches the equilibrium state after the water entering the third small tank;

The water entering process of the fourth small tank is: starting from the fourth small tank water inflow until the first The ship reached equilibrium after the four small tanks entered the water.

Preferably, the water is introduced into the first small tank until the state of the ship reaches equilibrium, the water in the second small tank reaches the state when the ship reaches equilibrium, the water in the third small tank reaches the state when the ship reaches equilibrium, and the fourth small tank Influent to the state when the ship reaches equilibrium, monitor whether the restoring arm in each state is positive. If the restoring arm is positive, the design of the through-chamber is in compliance with the requirements. A positive value indicates that the design of the through compartment does not meet the requirements.

Preferably, when the restoring arm is not positive, the size of the through compartment needs to be adjusted.

The beneficial effects of the invention:

The method for processing the through-chamber in calculating the damage stability of the ship provided by the present invention is to virtually divide the through-chamber into a plurality of small compartments along the width direction of the through-chamber, and assume that the plurality of small tanks sequentially enter water in sequence until The ship reaches equilibrium, so that it is only necessary to monitor the state of the multiple tanks when the ship reaches equilibrium in the calculation of the damage stability, to ensure that the recovery arm in each state is positive, no need to consider comprehensive Working conditions, eliminating the analysis and monitoring of many intermediate states, greatly saving calculation time and improving calculation efficiency.

DRAWINGS

1 is a schematic structural view of a cabin of a ship damage stability analysis provided by the prior art;

2 is a schematic structural view of a cabin for analyzing the stability of a ship damaged by the present invention.

In the picture:

100-through compartment;

101 - first small compartment; 102 - second small compartment; 103 - third small compartment; 104 - fourth small compartment.

detailed description

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and the embodiments of the present invention.

The invention provides a method for processing a through-chamber when calculating the stability of a ship, and referring to FIG. 1 to FIG. 2, in order to simplify the calculation process on the premise that the calculation result satisfies the requirement, a step of the through-chamber is taken as an example to introduce the steps of the present invention. :

S1: virtually dividing the through compartment 100 into four small compartments along the width direction of the through compartment 100;

Specifically, the left side of the ship's side is the first small compartment 101, the right side of the ship's side is the fourth small compartment 104, and the part between the left side of the ship's side and the right side of the ship's side is divided into a second small compartment 102 and a third small Cabin 103;

Of course, the number and separation method of the virtual compartments are not limited to this, and different separations can be made for different types of ships;

S2: assuming that the first small compartment 101 is advanced water, then the second small compartment 102 is flooded, then the third small compartment 103 is flooded, and finally the fourth small compartment 104 is flooded until the vessel reaches equilibrium;

Specifically, when the first small compartment 101 enters the water until the ship reaches equilibrium (ie, the water intake does not continue), the water intake of the second small compartment 102 begins to occur. Similarly, the second small compartment 102 enters the water until the ship reaches At the time of balance, the water intake of the third small compartment 103 begins to occur. Similarly, when the third small compartment 103 enters the water until the ship reaches equilibrium, the water inflow of the fourth small compartment 104 begins to occur, and so on, until all of the analysis area The small tank enters the water until the ship finally reaches equilibrium;

S3: the first small compartment 101 in step S2 is brought into the water until the state of the ship reaches equilibrium, the second small compartment 102 is flooded until the ship reaches equilibrium, and the third small compartment 103 is flooded until the ship reaches equilibrium. The state and the state when the fourth capsule 104 is flooded until the ship reaches equilibrium are defined as a first state, a second state, a third state, and a fourth state, respectively;

S4: During the calculation of the damage stability, the four states in step S3 are monitored to monitor whether the restoring arm in each state is a positive value, and if the restoring arm is a positive value, the through-chamber is The design meets the requirements. If the restoring arm is not positive, it means that the design of the through compartment does not meet the requirements, and the size of the through compartment needs to be adjusted;

S5: Perform the damage stability calculation on the resized through-chambers according to the above steps S1-S4 until the final monitored recovery arm is positive.

By adopting the method for processing the through-chamber of the ship damage stability calculation provided by the invention, the process of analyzing thousands of working conditions is omitted, and only four states are monitored to ensure that the recovery arm of each state is positive. It can be used without any consideration of comprehensive working conditions, eliminating the need for analysis and monitoring of many intermediate states, which greatly saves computation time and improves computational efficiency.

It should be noted that the restoring force arm referred to in the present invention is defined as follows: when the ship is floating, the coordinate positions of the center of gravity and the floating center are on the same straight line (both perpendicular to the bottom of the ship), when the ship is caused by the external force. When tilting, the position of the center of gravity and the center of buoyancy is not in a straight line (the line refers to a straight line perpendicular to the bottom of the ship). At this time, the gravity of the ship and the buoyancy of the ship will form a moment, and the direction and external force are generated. The torque direction is opposite, the moment formed by the gravity of the ship and the buoyancy of the ship becomes the restoring moment, and the force arm corresponding to the restoring moment is called the restoring arm.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the appended claims.

Claims

A method for processing a through-chamber during calculation of a ship damage stability, characterized in that the through-chamber is virtually divided into a plurality of small compartments along the width direction of the through-chamber, and it is assumed that the plurality of small compartments sequentially enter water in sequence, Until the ship reaches equilibrium.
A method of processing a through compartment when calculating a ship damage stability according to claim 1, wherein the number of said small compartments is four.
The method for processing a through compartment when calculating a ship damage stability according to claim 2, wherein the distribution of the four small compartments is as follows:

The left side of the ship's side is the first small compartment, the right side of the ship's side is the fourth small compartment, and the part between the left side of the ship and the right side of the ship is divided into a second small compartment and a third small compartment.
The method for processing a through compartment when calculating a ship damage stability according to claim 3, characterized in that:

The water inflow process of the first small tank is: starting from the occurrence of the first small tank water inflow, until the first small tank enters the water and the ship reaches an equilibrium state;

The water inflow process of the second small tank is: starting from the occurrence of the water in the second small tank, until the water reaches the equilibrium state after the water entering the second small tank;

The water inflow process of the third small tank is: starting from the occurrence of the water in the third small tank, until the water reaches the equilibrium state after the water entering the third small tank;

The water inflow process of the fourth small tank is: starting from the occurrence of the fourth small tank water inflow until the fourth small tank enters the water and the ship reaches an equilibrium state.
The method for processing a through compartment when calculating a ship damage stability according to claim 4, characterized in that the first small tank is filled with water until the state of the ship reaches equilibrium, and the second small tank is filled with water until the ship reaches equilibrium The state, the third tank intake into the state when the ship reaches equilibrium, and the state in which the fourth tank enters the water until the ship reaches equilibrium, monitors whether the restoring arm in each state is positive, if If the compound arm is positive, it means that the design of the through-chamber is in compliance with the requirements. If the restoring arm is not positive, the design of the through-chamber is not satisfactory.
The method for processing a through compartment when calculating a ship damage stability according to claim 5, wherein when the restoring force arm is not positive, the size of the through compartment needs to be adjusted.