When the wind blows over the dock, the ship becomes more difficult to steer. When the wind blows above level 5, it is more difficult to operate on the dock, especially empty ships. Without the assistance of tugboat, it is very dangerous not to break down, and it is difficult to ensure the safe berthing of the ship. How to use anchor chain reasonably, the main factors to be considered are anchor timing, anchor chain length, anchor chain stress, external meteorological conditions and so on. This is the key to ensure the safe berthing of ships. This berthing can be divided into the following situations:
1. 1 The incoming wind blows in the bow direction (commonly known as the wind that blows in the first eight characters). According to the direction of the bow, the direction of the wind and the direction of the anchor chain, let's first analyze the force on the ship. When the ship is anchored, it is subjected to anchor tension T and wind force F. According to the force decomposition, T is decomposed into T 1 and T2, and F is decomposed into F 1 and F2. It is not difficult to see that T 1 and F 1 are in opposite directions, and their resultant force on the ship is: (t1-f1); T2 and F2 are in the same direction, and their resultant force on the ship is (T2+F2). From the direction of resultant force, the direction (TL-F 1) is perpendicular to the wharf, and the change of T 1 and F 1 will determine the speed of bow approaching. The changes of T2 and F2 will determine the forward and backward speed of the ship. After recognizing the function and direction of these forces, we further analyze their changes. (t 1-f 1) is the force perpendicular to the wharf, when (t1>; F 1), the bow is pulled by the anchor, and the bow moves to the outer block of the wharf. When (t 1