Automatic control system and method for displacement in ship dock

Abstract

The invention discloses an automatic control system and method for displacement in a ship dock, and belongs to the technical field of ship oceanographic engineering. An information collection device is used for collecting the total longitudinal stress, the local stress, the ship position and the stern inclination angle in the ship shifting process, the information processing device is used for controlling on-off of a remote control valve so as to control the water thrashing amount in a ship ballast tank and a dock, so that the water thrashing amount and the water thrashing time are reduced, and the ship shifting efficiency is improved. In addition, the ship is accurately positioned by controlling the displacement control system, and the accuracy and safety of ship displacement are improved.

Description

technical field [0001] The invention relates to the technical field of ship ocean engineering, in particular to an automatic control system and method for displacement in a ship dock. Background technique [0002] In the current shipbuilding process, in order to improve the utilization of the dock, the dock is relatively large, and two or more ships can be built at the same time. Due to the different manufacturing cycles of different ships, the first row of ships will be undocked, and the latter row of ships will be shifted. However, the displaced ship often has the following problems during the displacement process: [0003] 1. The problem of floating state. When the ship is floating, the floating state is always positive, because when the ship is floating, the center of gravity and the center of buoyancy are not on the same line. Generally, the bow will float first, which will cause the tail and the pier to be affected. The force is too large, so it is necessary to balan...

AI Technical Summary

Problems solved by technology

[0003] 1. The problem of floating state. When the ship is floating, the floating state is always positive, because when the ship is floating, the center of gravity and the center of buoyancy are not on the same line. Generally, the bow will float first, which will cause the tail and the pier to be affected. The force is too large, so it is necessary to balance the floating state by ballasting the water

But doing so creates two problems: on the one hand, the ballast water itself is also very heavy and in turn acts on the pier wood, which requires high strength of the pier wood, so it is necessary to increase the strength of the pier wood or increase the number of pier wood

Moreover, when the ship is under ballast, the weight becomes larger, and the buoyancy required also increases. Since the dock is very large, the rise of the liquid level that produces buoyancy means that a large amount of water needs to be injected into the dock. To generate a buoyancy of 1m, the entire Dumping 1m of water in the dock will greatly increase the time and material costs.

[0004] 2. The problem of positioning accuracy. After the ship is displaced, it still needs to sit on the pier again. Since the ship floats on the water, it is difficult to move and brake. If the positioning is not accurate, the ship will bottom when it sits on the pier The misalignment of the main structure and the pier will cause deformation of the outer panel

[0005] 3. Welding problems, often the previous ship is launched, and the following ships have not been fully welded (mostly half ships), because the weight and buoyancy distribution of the ship is different, the total longitudinal bending moment will be generated, and the ballast water will increase The total longitudinal bending moment, if the total longitudinal bending moment is greater than the section modulus of the hull, it will cause the hull to break

The current method is to recalculate the section modulus of the welded hull, but the safety factor must be enlarged, that is to say, a lot of welding man-hours will be added to the displaced ship, wasting manpower and time

Images