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Why is ship repair overturned?

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  • Time of issue:2019-06-24 04:10
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(Summary description)Ship repair as a carrier on the water, why can it maintain the balance on the water without overturning? Relying on the stability of the ship, when the ship is tilted by the external force,

Why is ship repair overturned?

(Summary description)Ship repair as a carrier on the water, why can it maintain the balance on the water without overturning? Relying on the stability of the ship, when the ship is tilted by the external force,

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2019-06-24 04:10
  • Views:
Information

Ship repair as a carrier on the water, why can it maintain the balance on the water without overturning? Relying on the stability of the ship, when the ship is tilted by the external force, its stability will exert a rotating torque, and the ship can return to the normal equilibrium state under the action of the torque. The so-called stability, that is, the GM value, refers to the interval between the center of gravity and the center of the heart. When the center of gravity is above the floating center, the GM value is a negative value; when the center of gravity is below the floating center, the GM value is a positive value; when the center of gravity overlaps with the floating center, the GM value is zero, that is, the stability disappears.

The stability of a ship in navigation is a dynamic value. It will change due to the influence of the wind and waves, so that the ship will be inclined. The greater the inclination angle, the greater the stability loss, and the greater the recovery torque. When the ship is tilted due to external action, if the ship's turning torque cannot rectify the ship before the stability of the ship disappears, the ship may overturn.

Then, is the ship in navigation mainly affected by external factors and tilted?

First of all, the reason for the sky.

The external image of the waves, the wind and the like will cause external forces on the ship and cause the ship to tilt. Wind and waves are the main factors. The wind will cause pressure on the ship's water surface and cause the ship to tilt. The larger the ship's wind receiving area, the greater the impact. Such as passenger ships, container ships, ro-ro ships, etc. The other is the swell. When the ship is sailing, the hull collides with the swell. The external force generated by the swell may also cause the ship to tilt. Therefore, external factors such as sky are an important factor that causes the ship to tilt, especially extreme and harsh weather.

Second, in addition to the weather, will the ship's operation be tilted? Of course, in the process of steering, in order to maintain the chaos and speed, the ship will tilt toward the inner core of the rotation. The faster the speed, the more significant the inclination, and the faster the steering speed, the more significant the inclination, so the ship is turning. The loss of stability during the process leads to severe tilt and may even tip over. The smaller the draught of the ship, the more significant the steering will be, such as passenger ships and empty cargo ships. In the case of a small draught, it is easier to cause tilt if the steering speed is fast. One way to avoid steering too fast is to avoid steering with a large rudder angle when using the rudder. The steering angle of the rudder angle is small and the speed is relatively slow, because the inclination of the ship caused by the steering will not be significant.

Then, from the above point of view, due to the sky color and operation, etc., the ship may be tilted and the stability of the ship may be lost. The severe stability becomes zero or even the stability becomes negative, and then overturning may occur. It can be inferred that if the stability is greater, the loss of stability of the ship when it is inclined is small, and the less chance of stability becoming negative, such as sailing, etc., we can often see that the sailboat is tilted at a large angle but its Will not overturn.

So what is the stability of the ship? What factors can increase the stability of the ship? What other factors will affect the stability of the ship? This is the subject of ship loading.

Ships, whether they are cargo ships or passenger ships, are the most important sectors of ships, and are the most important factors for ship loading, which easily affect the stability of ships. When the cargo ship accepts the carrying task, the master is responsible for ensuring that the ship is in a fair range of stability. Passenger ships are difficult to control because of the mobility of passengers, but passenger ships can be laid out in accordance with shipbuilding specifications to ensure that they have sufficient stability. Because the draught of the passenger ship is relatively small, the stability of the cargo ship is relatively poor. Therefore, the passenger ship is equipped with a ballast water tank at the time of manufacture, so that the captain can use it as a regulating stability.

Generally speaking, at the bottom of the ship, there will be corresponding ballast water tanks, fresh water tanks, oil tanks, etc., which will have an impact on stability. If the captain thinks that the configuration of the passenger and cargo tank is unfavorable to the stability of the ship, it can adjust the pressure. The tank is loaded to increase the stability of the ship. For long-haul ships, especially those with poor stability, such as wooden ships, it is necessary to take into account the impact of fuel consumption and fresh water consumption on the stability of the ship during the voyage. The captain is responsible for the actual situation of the ship. Professional and fair layout of the navigation area and weather conditions to ensure the safety of the ship.

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Weihai Dingsheng Ship Engineering Co., Ltd.

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